/* ===== CSS CUSTOM PROPERTIES ===== */

:root {
  /* Light Professional Color Palette */
  --bg: #f8fafc; /* very light gray background */
  --surface: #ffffff; /* pure white cards */
  --surface2: #f1f5f9; /* light gray for inputs */
  --border: #cbd5e1; /* soft blue‑gray border */
  --border-light: #e2e8f0; /* lighter border for hover */
  --border-strong: #94a3b8; /* stronger border for focus */
  --primary: #2563eb; /* professional blue */
  --primary-light: #3b82f6; /* lighter blue for hover */
  --primary-dark: #1e40af; /* darker blue for active */
  --primary-glow: rgba(37,99,235,0.12);
  --accent-gold: #d4af37;
  --accent-gold-glow: #fffbe6;
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-purple: #9333ea;
  --accent-green: #16a34a;
  --accent-orange: #f97316;
  --cyan: #06b6d4;
  --amber: #d97706;
  --amber-light: #f59e0b;
  --green: #10b981;
  --red: #ef4444;
  --purple: #a855f7;
  --text: #0f172a; /* dark gray for primary text */
  --text2: #334155; /* secondary text */
  --text3: #64748b; /* tertiary */
  --text4: #94a3b8; /* quaternary */
  --radius: 12px;
  --radius-sm: 8px;
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 12px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.16);
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --glass-blur: blur(8px);
}

.ultra-glass {
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1.5px solid var(--border);
  margin: 1.5em auto 2em auto;
  padding: 1.5em 2.5em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 10;
}
.ultra-logo {
  display: flex;
  align-items: center;
  gap: 0.7em;
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-shadow: 0 2px 8px var(--accent-gold-glow);
  background: none;
}
.ultra-3d svg {
  filter: drop-shadow(0 2px 12px #d4af37cc);
  animation: ultra-spin 2.5s linear infinite;
}
@keyframes ultra-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
.ultra-gradient {
  background: linear-gradient(90deg, #d4af37 0%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-fill-color: transparent;
}
.ultra-nav {
  display: flex;
  align-items: center;
  gap: 1.5em;
}
.ultra-link {
  font-weight: 600;
  font-size: 1.1em;
  color: var(--primary);
  padding: 0.4em 1.1em;
  border-radius: var(--radius-sm);
  background: transparent; border: 1px solid var(--primary);
  box-shadow: 0 2px 8px #d4af3722;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.ultra-link:hover, .ultra-link:focus {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px var(--primary-glow);
}
.ultra-lang {
  background: #fffbe6;
  color: var(--primary);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--accent-gold);
  font-weight: 600;
  margin-left: 1em;
  padding: 0.3em 0.7em;
  box-shadow: 0 1px 4px #d4af3722;
}

/* ===== DARK MODE ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e1a;
    --surface: #1a2332;
    --surface2: #141b28;
    --border: #2d3f52;
    --border-light: #384859;
    --border-strong: #445668;
    --text: #e8eef7;
    --text2: #c1cad8;
    --text3: #8896a8;
    --text4: #6b7d94;
    --accent-gold: #e6c256;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 28px rgba(0, 0, 0, 0.4);
  }

  input,
  select {
    background: #0f172a;
    color: #e8eef7;
    border-color: #2d3f52;
  }

  input:focus,
  select:focus {
    background: #1a2332;
    border-color: var(--accent-blue);
  }

  .result-mini {
    background: rgba(37, 99, 235, 0.1);
    border-color: var(--accent-blue);
  }

  .highlight-box {
    background: rgba(37, 99, 235, 0.08);
    border-color: var(--accent-blue);
  }

  .formula-display {
    background: #141b28;
  }

  .example-box {
    background: rgba(37, 99, 235, 0.05);
  }

  .reference-table th {
    background: #1e293b;
  }

  .reference-table td {
    border-color: #334155;
  }

  .site-footer {
    background: linear-gradient(to bottom, #0f172a, #0a0e1a);
    border-top: 1px solid var(--border);
  }
}

/* ===== RESET ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-text-size-adjust: 100%;
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 20px 40px;
}

/* ===== SKIP LINK ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 8px;
  z-index: 200;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
}

/* ===== HEADER ===== */
.site-header {
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  padding: 10px 0;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.header-logo {
  font-size: 16px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: transform var(--transition);
}

.header-logo:hover {
  transform: scale(1.02);
}

.header-logo-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.header-logo-text {
  display: none;
}

@media (min-width: 768px) {
  .header-logo-text {
    display: inline;
  }
}

.header-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
}

.nav-link {
  font-size: 11px;
  font-weight: 600;
  color: var(--text2);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 50px;
  background: var(--surface2);
  border: 1px solid var(--border);
  transition: all var(--transition);
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-link:hover,
.nav-link:focus-visible {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px var(--primary-glow);
  outline: none;
  transform: translateY(-1px);
}

.lang-select {
  font-size: 11px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 50px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  cursor: pointer;
  font-family: var(--font);
  min-height: 44px;
  transition: all var(--transition);
}

.lang-select:hover {
  border-color: var(--primary);
}

.lang-select:focus-visible {
  outline: 3px solid var(--primary-light);
  outline-offset: 2px;
}

/* ===== BRAND HEADER ===== */
.brand-header {
  text-align: center;
  padding: 32px 20px 24px;
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.05), rgba(59, 130, 246, 0.05));
  border-radius: var(--radius);
  margin-bottom: 24px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 8px 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.5px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
}

.brand-badge-dot {
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.35;
    transform: scale(0.6);
  }
}

.hero-title {
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 900;
  letter-spacing: -1.2px;
  line-height: 1.12;
  margin-bottom: 16px;
  color: var(--text);
  background: linear-gradient(135deg, var(--text), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content {
  max-width: 850px;
  margin: 0 auto;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--text2);
  line-height: 1.6;
  margin-bottom: 10px;
}

.hero-subtitle strong {
  color: var(--primary);
  font-weight: 600;
}

.highlight-intro {
  background: rgba(30, 64, 175, 0.08);
  padding: 14px 16px;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
}

/* ===== SECTION DIVIDER ===== */
.section-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 36px 0 24px;
}

.icon-circle {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.section-divider h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
  margin: 0;
}

.section-divider .line {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--border-strong), transparent);
  border-radius: 2px;
}

/* ===== CARDS ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.card-glow {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 1px rgba(30, 64, 175, 0.1), var(--shadow-lg);
}

/* ===== GRID LAYOUTS ===== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.three-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 16px;
}

.calculator-layout {
  margin-bottom: 24px;
}

@media (max-width: 900px) {
  .two-col {
    grid-template-columns: 1fr;
  }

  .three-col {
    grid-template-columns: 1fr;
  }

  .header-inner {
    gap: 6px;
  }

  .nav-link {
    font-size: 10px;
    padding: 6px 10px;
  }
}

/* ===== INPUTS ===== */
.input-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.input-group {
  flex: 1;
  min-width: 100px;
}

label {
  display: block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text3);
  margin-bottom: 4px;
}

input,
select {
  width: 100%;
  padding: 14px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface2);
  color: var(--text);
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 500;
  outline: none;
  transition: all var(--transition);
  min-height: 48px;
}

input:hover,
select:hover {
  border-color: var(--primary-light);
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.08);
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
  background: var(--surface);
}

select {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

input[type="number"] {
  -moz-appearance: textfield;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition);
  text-transform: uppercase;
  min-height: 48px;
  min-width: 44px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--primary-glow);
  outline: none;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background: var(--surface);
  border: 2px solid var(--border);
  color: var(--text2);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(30, 64, 175, 0.05);
  outline: none;
}

.btn-sm {
  padding: 10px 16px;
  font-size: 12px;
  min-height: 44px;
}

.btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ===== RESULT ===== */
.result-mini {
  background: #f0f4ff;
  border: 2px solid var(--primary-light);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-top: 10px;
  text-align: center;
  display: none;
  animation: slideInUp 0.35s ease;
}

.result-mini.show {
  display: block;
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-mini-val {
  font-size: 26px;
  font-weight: 900;
  color: var(--primary);
  font-family: var(--mono);
  word-break: break-word;
}

.result-mini-unit {
  font-size: 10px;
  color: var(--text3);
  font-weight: 600;
  margin: 2px 0;
}

/* ===== VISUAL PANEL ===== */
.visual-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  position: relative;
}

.visual-panel::before {
  content: "ENGINEERING VIEW  |  V  A  W  VA  PF  \03A9  \0394V  \221A3";
  display: block;
  background: linear-gradient(90deg, #eef6ff, #f8fafc);
  border: 1px solid #d4dde8;
  border-radius: 8px;
  color: #174ea6;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  padding: 9px 11px;
  white-space: normal;
}

.visual-header {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text3);
  margin-bottom: 12px;
  font-weight: 600;
}

.visual-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  padding: 12px 14px;
  background: var(--surface2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.visual-row:hover {
  border-color: var(--primary-light);
  background: rgba(59, 130, 246, 0.03);
}

.visual-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
  min-width: 44px;
}

.visual-icon.voltage {
  background: #eff6ff;
  color: #1e40af;
  border: 2px solid #bfdbfe;
}

.visual-icon.current {
  background: #fff7ed;
  color: #b45309;
  border: 2px solid #fed7aa;
}

.visual-icon.power {
  background: #ecfdf5;
  color: #047857;
  border: 2px solid #a7f3d0;
}

.visual-info {
  flex: 1;
}

.visual-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text4);
  font-weight: 700;
}

.visual-value {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.visual-bar-wrap {
  width: 100%;
  height: 5px;
  background: #e5e7eb;
  border-radius: 3px;
  margin-top: 5px;
  overflow: hidden;
}

.visual-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease;
}

.visual-bar-fill.voltage {
  background: linear-gradient(90deg, #1e40af, #3b82f6);
}

.visual-bar-fill.current {
  background: linear-gradient(90deg, #b45309, #d97706);
}

.visual-bar-fill.power {
  background: linear-gradient(90deg, #047857, #10b981);
}

.visual-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-top: 8px;
}

.visual-metric {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 10px;
  text-align: center;
  transition: all var(--transition);
}

.visual-metric:hover {
  border-color: var(--primary-light);
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.08);
}

.metric-label {
  font-size: 8px;
  color: var(--text4);
  font-weight: 700;
  text-transform: uppercase;
}

.metric-value {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  margin-top: 2px;
}

.metric-value.amber {
  color: var(--amber-light);
}

/* ===== DYNAMIC POWER HOUSE CIRCUIT DIAGRAM ===== */
.circuit-visual-panel {
  overflow: hidden;
}

.visual-panel-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.visual-panel-topline .visual-header {
  margin-bottom: 0;
}

.circuit-status {
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--primary-dark);
  background: #eff6ff;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1;
  padding: 7px 10px;
  text-transform: uppercase;
  white-space: nowrap;
}

.circuit-diagram-card {
  --flow-speed: 2.2s;
  --wire-width: 6;
  --house-glow: 0.35;
  background:
    linear-gradient(rgba(23, 78, 166, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 78, 166, 0.045) 1px, transparent 1px),
    radial-gradient(circle at 85% 18%, rgba(250, 204, 21, 0.18), transparent 22%),
    radial-gradient(circle at 12% 20%, rgba(59, 130, 246, 0.18), transparent 24%),
    linear-gradient(180deg, #f8fbff 0%, #eef6ff 55%, #f8fafc 100%);
  background-size: 24px 24px, 24px 24px, auto, auto, auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), var(--shadow-sm);
  margin-bottom: 12px;
  overflow: hidden;
  padding: 10px;
  position: relative;
}

.circuit-diagram-card::after {
  content: '';
  position: absolute;
  inset: auto 24px 14px;
  height: 16px;
  background: linear-gradient(90deg, rgba(37,99,235,0.08), rgba(22,163,74,0.14), rgba(249,115,22,0.08));
  border-radius: 50%;
  filter: blur(8px);
  opacity: 0.85;
}

.power-house-diagram {
  display: block;
  height: auto;
  max-height: 330px;
  position: relative;
  width: 100%;
  z-index: 1;
}

.diagram-label {
  fill: #475569;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.diagram-value {
  fill: #0f172a;
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 800;
}

.diagram-node {
  filter: drop-shadow(0 8px 12px rgba(15, 23, 42, 0.12));
}

.house-node {
  filter: drop-shadow(0 8px 18px rgba(249, 115, 22, var(--house-glow)));
}

.circuit-wire {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.wire-base {
  stroke: #cbd5e1;
  stroke-width: 13;
}

.wire-flow {
  animation: circuit-flow var(--flow-speed) linear infinite;
  filter: url(#circuit-glow);
  stroke: url(#wire-gradient);
  stroke-dasharray: 18 18;
  stroke-width: var(--wire-width);
}

.return-wire {
  fill: none;
  stroke: #94a3b8;
  stroke-dasharray: 8 14;
  stroke-linecap: round;
  stroke-width: 4;
}

.load-light {
  animation: load-pulse 1.4s ease-in-out infinite;
  transform-box: fill-box;
  transform-origin: center;
}

.diagram-output-badge rect {
  fill: rgba(15, 23, 42, 0.88);
  stroke: rgba(255, 255, 255, 0.55);
  stroke-width: 2;
}

.badge-label {
  fill: #bfdbfe;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.badge-value {
  fill: #ffffff;
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 900;
}

.circuit-diagram-card.idle .wire-flow {
  animation-play-state: paused;
  opacity: 0.25;
}

.circuit-diagram-card.warning .diagram-output-badge rect {
  fill: rgba(146, 64, 14, 0.9);
}

.circuit-diagram-card.danger .diagram-output-badge rect {
  fill: rgba(127, 29, 29, 0.92);
}

.circuit-diagram-card.warning + .visual-row .visual-icon,
.circuit-diagram-card.danger + .visual-row .visual-icon {
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.12);
}

.visual-row.compact {
  margin-bottom: 8px;
  padding: 10px 12px;
}

.visual-row.compact .visual-icon {
  height: 38px;
  min-width: 38px;
  width: 38px;
}

.circuit-metrics-grid {
  grid-template-columns: repeat(4, 1fr);
}

@keyframes circuit-flow {
  to { stroke-dashoffset: -72; }
}

@keyframes load-pulse {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.12); }
}

@media (max-width: 700px) {
  .visual-panel-topline {
    align-items: flex-start;
    flex-direction: column;
  }

  .circuit-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric-value.green {
  color: var(--green);
}

/* ===== TABLE ===== */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin: 14px 0;
  -webkit-overflow-scrolling: touch;
}

.reference-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  background: var(--surface);
  min-width: 400px;
}

.reference-table th {
  background: #f1f5f9;
  padding: 12px 14px;
  text-align: left;
  font-weight: 700;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--primary);
  border-bottom: 2px solid var(--border-strong);
  white-space: nowrap;
}

.reference-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-light);
  font-family: var(--mono);
  color: var(--text2);
}

.reference-table tbody tr:hover td {
  background: rgba(59, 130, 246, 0.04);
}

/* ===== CONTENT ===== */
.content-h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin: 18px 0 8px;
}

.content-h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  margin: 14px 0 5px;
}

.content-p {
  color: var(--text2);
  font-size: 15px;
  line-height: 1.78;
  margin-bottom: 10px;
}

.content-p strong {
  color: var(--text);
  font-weight: 600;
}

.formula-display {
  background: #f8fafd;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 14px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  text-align: center;
  margin: 10px 0;
  position: relative;
  overflow-x: auto;
}

.example-box {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-left: 4px solid var(--amber);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 8px 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text2);
  line-height: 1.6;
}

.example-box strong {
  color: var(--amber);
}

.highlight-box {
  background: #eff6ff;
  border: 2px solid #bfdbfe;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 14px 0;
}

/* ===== TOOLS GRID ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 16px;
}

@media (max-width: 500px) {
  .tools-grid {
    grid-template-columns: 1fr;
  }
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
}

.tool-card-icon {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.tool-card-icon.blue {
  background: #eff6ff;
  color: #1e40af;
}

.tool-card-icon.amber {
  background: #fff7ed;
  color: #b45309;
}

.tool-card-icon.green {
  background: #ecfdf5;
  color: #047857;
}

.tool-card-icon.purple {
  background: #f5f3ff;
  color: #7c3aed;
}

.tool-card-icon.cyan {
  background: #ecfeff;
  color: #0e7490;
}

.tool-card-icon.rose {
  background: #fff1f2;
  color: #be123c;
}

.tool-card-meta {
  flex: 1;
}

.tool-card-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.tool-card-subtitle {
  font-size: 10px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.tool-card-link {
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.tool-card-desc {
  flex: 1;
  font-size: 14px;
  color: var(--text2);
  line-height: 1.5;
  margin-bottom: 12px;
}

.tool-card-arrow {
  align-self: flex-end;
  font-size: 18px;
  color: var(--primary);
  transition: transform var(--transition), color var(--transition);
}

.tool-card-link:hover .tool-card-arrow {
  transform: translateX(4px);
  color: var(--primary-dark);
}

/* ===== TOOL CARD ENHANCEMENTS ===== */
.tool-card-visual {
  width: 100%;
  height: 100px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(37,99,235,0.04), rgba(59,130,246,0.04));
  border-radius: var(--radius-sm);
  padding: 12px;
}

.tool-diagram {
  width: 100%;
  height: 100%;
  max-width: 120px;
  max-height: 100px;
  object-fit: contain;
}

.formula {
  background: rgba(37,99,235,0.12);
  color: var(--primary-dark);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.9em;
  font-weight: 600;
}

.tool-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0;
}

.spec-badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(59,130,246,0.08));
  color: var(--primary-dark);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: 1px solid rgba(37,99,235,0.2);
  white-space: nowrap;
}

.tool-use-case {
  margin-top: 12px;
  padding: 10px 12px;
  background: linear-gradient(135deg, rgba(37,99,235,0.06), rgba(59,130,246,0.06));
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  font-size: 13px;
  line-height: 1.5;
  color: var(--text2);
}

.tool-use-case strong {
  color: var(--primary-dark);
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

@media (max-width: 768px) {
  .tool-card-visual {
    height: 80px;
  }

  .tool-specs {
    gap: 5px;
  }

  .spec-badge {
    font-size: 9px;
    padding: 3px 8px;
  }

  .tool-use-case {
    font-size: 12px;
    padding: 8px 10px;
  }
}

.related-tools-section {
  margin: 2em 0;
}

.related-tools-card {
  display: flex;
  flex-direction: column;
  gap: 1.5em;
}

/* ===== FAQ ===== */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--primary-light);
}

.faq-q {
  width: 100%;
  background: var(--surface);
  border: none;
  padding: 16px 20px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  min-height: 52px;
  transition: all var(--transition);
}

.faq-q:hover,
.faq-q:focus-visible {
  background: var(--surface2);
  color: var(--primary);
  outline: none;
}

.faq-icon {
  font-size: 20px;
  color: var(--primary);
  transition: transform var(--transition);
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}

.faq-q[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s ease, padding 0.35s;
  background: var(--surface2);
  border-top: 1px solid var(--border-light);
}

.faq-a.open {
  max-height: 700px;
  padding: 16px 20px;
}

.faq-a p {
  color: var(--text2);
  font-size: 14px;
  line-height: 1.7;
}

/* ===== DEVICE GRID ===== */
.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
}

.device-chip {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  min-height: 60px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.device-chip:hover,
.device-chip:focus-visible {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px var(--primary-glow);
  outline: none;
}

.device-name {
  font-weight: 700;
  font-size: 11px;
  margin-bottom: 3px;
}

.device-watt {
  font-family: var(--mono);
  color: var(--primary);
  font-size: 15px;
  font-weight: 700;
}

/* ===== ERROR ===== */
.error-msg {
  color: var(--red);
  font-size: 13px;
  padding: 10px 14px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-sm);
  margin-top: 8px;
  display: none;
  font-weight: 500;
  animation: slideInDown 0.3s ease;
}

.error-msg[role="alert"] {
  display: block;
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ===== CONTENT PAGES ===== */
.page-content {
  padding-top: 12px;
}

.legal-card {
  max-width: 960px;
  margin: 0 auto;
}

.legal-card h1 {
  color: var(--primary-dark);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  margin-bottom: 18px;
}

.legal-card h2 {
  color: var(--text);
  margin-top: 28px;
  margin-bottom: 10px;
}

.legal-card ul {
  padding-left: 24px;
  margin: 12px 0 18px;
}

.legal-card a {
  color: var(--primary);
  font-weight: 700;
}


.page-updated {
  color: var(--text3);
  font-size: 0.95rem;
  margin-bottom: 18px;
}

.page-toc {
  background: var(--surface2);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  margin: 24px 0;
  padding: 18px 20px;
}

.page-toc h2 {
  margin-top: 0;
}

.page-toc ul {
  columns: 2;
  gap: 28px;
  margin-bottom: 0;
}

.policy-table-wrap {
  overflow-x: auto;
  margin: 18px 0 24px;
}

.policy-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
}

.policy-table th,
.policy-table td {
  border: 1px solid var(--border-light);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.policy-table th {
  background: var(--primary-dark);
  color: #fff;
}

.policy-preference-list {
  display: grid;
  gap: 16px;
  margin: 18px 0 24px;
}

.preference-card {
  background: var(--surface2);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}

.preference-card h3 {
  margin-top: 0;
  color: var(--primary-dark);
}

@media (max-width: 700px) {
  .page-toc ul {
    columns: 1;
  }
}

/* ===== FOOTER ===== */
.site-footer {
  background: linear-gradient(180deg, var(--surface) 0%, #eef5ff 100%);
  border-top: 2px solid var(--primary-light);
  color: var(--text2);
  font-size: 13px;
  margin-top: 48px;
  padding: 48px 20px 20px;
  box-shadow: 0 -8px 28px rgba(37, 99, 235, 0.08);
}

.footer-content {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  margin-bottom: 28px;
}

@media (max-width: 900px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 600px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

.footer-section {
  text-align: left;
}

.footer-brand {
  text-align: left;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: -0.5px;
}

.footer-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent-blue));
  color: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 16px;
}

.footer-desc {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.6;
  margin-bottom: 12px;
}

.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 12px;
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-3px);
}

.footer-heading {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary-dark);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(37, 99, 235, 0.18);
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  color: var(--text2);
  text-decoration: none;
  font-size: 12px;
  line-height: 1.5;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
}

.footer-link::before {
  content: "›";
  margin-right: 6px;
  color: var(--primary);
  font-size: 14px;
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--transition);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--primary-dark);
  outline: none;
}

.footer-link:hover::before,
.footer-link:focus-visible::before {
  opacity: 1;
  transform: translateX(0);
}

.footer-divider {
  max-width: 1320px;
  margin: 20px auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.22), transparent);
  opacity: 0.75;
}

.footer-disclaimer {
  max-width: 1320px;
  margin: 0 auto;
  padding: 16px 20px;
  background: rgba(37, 99, 235, 0.06);
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  margin-bottom: 20px;
}

.disclaimer-header {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary-dark);
  margin-bottom: 6px;
}

.disclaimer-text {
  font-size: 11px;
  line-height: 1.6;
  color: var(--text2);
}

.disclaimer-text strong {
  color: var(--text);
  font-weight: 600;
}

.footer-languages {
  max-width: 1320px;
  margin: 0 auto;
  padding: 20px;
  background: rgba(37, 99, 235, 0.06);
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 8px;
  margin-bottom: 20px;
}

.footer-languages-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--primary-dark);
  margin-bottom: 10px;
}

.language-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.lang-btn {
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid rgba(37, 99, 235, 0.28);
  border-radius: 6px;
  color: var(--primary-dark);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
  min-height: 32px;
}

.lang-btn:hover,
.lang-btn:focus-visible,
.lang-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  outline: none;
  transform: translateY(-2px);
}

.language-status {
  color: var(--text3);
  font-size: 11px;
  margin-top: 10px;
}

.footer-bottom {
  max-width: 1320px;
  margin: 0 auto;
  text-align: center;
  padding: 10px 20px;
  font-size: 10px;
  color: var(--text3);
  border-top: 1px solid rgba(37, 99, 235, 0.16);
}

.footer-bottom p {
  margin: 0;
  line-height: 1.5;
}

/* ===== PRINT STYLES ===== */
@media print {
  .site-header,
  .site-footer,
  .btn,
  .tools-grid,
  .device-grid,
  .faq-item,
  .visual-panel,
  #main-error,
  .brand-badge,
  .lang-select,
  .skip-link,
  .calculator-section {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
    margin-bottom: 10px;
  }

  .reference-table {
    font-size: 10pt;
  }

  .reference-table th {
    background: #eee;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }

  h1 {
    font-size: 20pt;
  }

  h2 {
    font-size: 16pt;
  }
}

/* ===== SR-ONLY (SCREEN READER) ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== ENHANCED CALCULATOR STYLING ===== */
.calculator-card {
  position: relative;
  overflow: hidden;
}

.calculator-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent-blue), var(--accent-gold));
  opacity: 0.8;
}

.calculator-card form {
  position: relative;
  z-index: 1;
}

.calculator-layout {
  align-items: start;
}

@media (max-width: 900px) {
  .calculator-layout {
    margin-bottom: 16px;
  }
}

/* Enhanced input styling for calculator */
.calculator-card input,
.calculator-card select {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(248, 250, 252, 1));
  border: 2px solid var(--border);
  font-size: 14px;
  transition: all var(--transition);
}

.calculator-card input:focus,
.calculator-card select:focus {
  background: #fff;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

/* ===== ENHANCED TOOL CARD SIZING ===== */
.tool-card {
  min-height: 420px;
  display: flex;
  flex-direction: column;
}

.tool-card .input-row {
  margin-bottom: 12px;
}

.tool-card .input-group {
  flex: 1;
  min-width: 120px;
}

.tool-card button {
  margin-top: auto;
  margin-bottom: 12px;
}

/* ===== BETTER SPACING & SIZING ===== */
.input-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}

.input-group {
  flex: 1;
  min-width: 140px;
  display: flex;
  flex-direction: column;
}

label {
  margin-bottom: 6px;
  min-height: 24px;
  display: flex;
  align-items: center;
}

input,
select {
  font-size: 15px;
  padding: 12px 14px;
  border-radius: 8px;
  min-height: 48px;
}

input::placeholder {
  color: var(--text4);
}

/* ===== RESULT DISPLAY IMPROVEMENTS ===== */
.result-mini {
  background: linear-gradient(135deg, #f0f4ff, #f9f5ff);
  border: 2px solid var(--accent-blue);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
  border-radius: 10px;
  padding: 18px 20px;
}

.result-mini-val {
  font-size: 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== VISUAL ENHANCEMENTS ===== */
.section-divider {
  margin: 40px 0 28px;
}

.icon-circle {
  width: 44px;
  height: 44px;
  font-size: 20px;
  box-shadow: 0 6px 16px rgba(30, 64, 175, 0.2);
  border-radius: 12px;
}

.section-divider h2 {
  font-size: 26px;
  letter-spacing: -0.5px;
}

/* ===== BRAND ENHANCEMENT ===== */
.brand-header {
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.06), rgba(37, 99, 235, 0.04), rgba(212, 175, 55, 0.02));
  border: 1px solid rgba(30, 64, 175, 0.1);
}

.hero-title {
  margin-bottom: 20px;
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */
input:focus-visible,
select:focus-visible,
button:focus-visible,
.footer-link:focus-visible {
  outline: 3px solid var(--accent-blue);
  outline-offset: 2px;
}

/* ===== DARK MODE ENHANCEMENTS ===== */
@media (prefers-color-scheme: dark) {
  .calculator-card input,
  .calculator-card select {
    background: rgba(10, 14, 26, 0.8);
    border-color: var(--border);
  }

  .calculator-card input:focus,
  .calculator-card select:focus {
    background: #1a2332;
    border-color: var(--accent-blue);
  }

  .result-mini {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(147, 51, 234, 0.08));
    border-color: var(--accent-blue);
  }

  .brand-header {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(147, 51, 234, 0.04));
  }
}

/* ===== OPTION BOX SIZING ===== */
.select-wrapper {
  position: relative;
  width: 100%;
}

select {
  padding-right: 40px;
}

select::after {
  content: "";
  position: absolute;
  right: 12px;
  pointer-events: none;
}

/* ===== BUTTON IMPROVEMENTS ===== */
.btn-primary {
  font-size: 13px;
  letter-spacing: 1px;
  min-height: 48px;
  padding: 12px 24px;
}

.btn-outline {
  min-height: 48px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ===== SECTION SPACING ===== */
.calculator-section,
.tools-section,
.content-section,
.formulas-section,
.powerfactor-section,
.examples-section,
.tables-section,
.considerations-section,
.devices-section,
.faq-section {
  margin-bottom: 24px;
}

.calculator-card {
  flex: 1;
}

.content-card,
.formula-card,
.pf-card,
.examples-card,
.tables-card,
.considerations-card,
.devices-card,
.faq-card {
  max-width: 100%;
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== PREMIUM WATTS TO AMPS STYLES ===== */
.premium-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: linear-gradient(135deg, #d4af37, #f59e0b);
  color: #000;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.premium-card {
  position: relative;
  border: 2px solid #d4af37;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.05), rgba(245, 158, 11, 0.03));
  box-shadow: 0 8px 32px rgba(212, 175, 55, 0.15);
}

.premium-result {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.1), rgba(245, 158, 11, 0.05));
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.premium-details {
  background: rgba(255, 251, 235, 0.5);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: 8px;
  padding: 12px;
  margin-top: 12px;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 13px;
}

.detail-label {
  color: var(--text2);
  font-weight: 500;
}

.detail-value {
  color: var(--text);
  font-weight: 600;
  font-family: var(--mono);
}

.premium-diagram {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), rgba(245, 158, 11, 0.04));
  border-radius: 12px;
  padding: 16px;
}

.premium-flow {
  stroke: #d4af37;
  stroke-width: 3;
  fill: none;
  animation: premium-flow 2s ease-in-out infinite;
}

@keyframes premium-flow {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.btn-premium {
  background: linear-gradient(135deg, #d4af37, #f59e0b);
  color: #000;
  border: none;
  font-weight: 700;
  letter-spacing: 1px;
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.3);
  transition: all 0.3s ease;
}

.btn-premium:hover {
  background: linear-gradient(135deg, #f59e0b, #d4af37);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.4);
}

.premium-metrics .visual-metric {
  background: rgba(255, 251, 235, 0.8);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.circuit-status.premium {
  background: linear-gradient(135deg, #d4af37, #f59e0b);
  color: #000;
  font-weight: 600;
}

/* ===== RESULT DETAILS ENHANCEMENT ===== */
.result-details {
  background: rgba(248, 250, 252, 0.8);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 12px;
  margin-top: 12px;
}

.result-details .detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 13px;
}

.result-details .detail-label {
  color: var(--text2);
  font-weight: 500;
}

.result-details .detail-value {
  color: var(--text);
  font-weight: 600;
  font-family: var(--mono);
}

.battery-diagram-card,
.power-diagram-card,
.tool-card-visual {
  background-image:
    linear-gradient(rgba(23, 78, 166, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 78, 166, 0.045) 1px, transparent 1px),
    linear-gradient(180deg, #ffffff, #f5f9ff);
  background-size: 22px 22px, 22px 22px, auto;
}

.visual-metric,
.result-details,
.rule-card {
  background: #f8fbff;
  border-color: #cbd7e6;
}

.metric-label,
.detail-label,
.result-mini-unit {
  color: #334155;
}

.metric-value,
.detail-value,
.visual-value {
  color: #0b2f66;
}

/* ===== PROFESSIONAL HOME REFRESH ===== */
body {
  background:
    linear-gradient(180deg, rgba(241, 245, 249, 0.92), rgba(248, 250, 252, 1) 420px),
    #f8fafc;
}

.pro-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(148, 163, 184, 0.28);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.pro-header-inner {
  border: 0;
  border-radius: 0;
  box-shadow: none;
  margin: 0 auto;
  padding: 8px 20px;
}

.pro-logo {
  letter-spacing: 0;
  text-shadow: none;
}

.pro-logo .header-logo-text {
  display: inline;
  font-size: clamp(15px, 2vw, 20px);
  color: #0f172a;
  background: none;
  -webkit-text-fill-color: currentColor;
}

.pro-logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: linear-gradient(135deg, #0f172a, #2563eb);
  box-shadow: 0 12px 26px rgba(37, 99, 235, 0.2);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0;
}

.pro-logo-icon::before {
  content: "A/W";
}

.pro-logo-icon svg {
  display: none;
}

.pro-nav {
  gap: 6px;
}

.pro-nav .nav-link {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #334155;
  font-size: 13px;
  min-height: 38px;
  padding: 8px 12px;
}

.pro-nav .nav-link:hover,
.pro-nav .nav-link:focus-visible {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #1d4ed8;
  box-shadow: none;
  transform: none;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  cursor: pointer;
  font-family: var(--font);
}

.nav-dropdown-toggle::after {
  content: "";
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  display: inline-block;
  margin-left: 8px;
  transform: translateY(1px);
}

.nav-dropdown-menu {
  background: #ffffff;
  border: 1px solid #b8c4d2;
  border-radius: 10px;
  box-shadow: 0 22px 50px rgba(15, 23, 42, 0.16);
  display: grid;
  gap: 4px;
  left: 0;
  min-width: 260px;
  opacity: 0;
  padding: 8px;
  pointer-events: none;
  position: absolute;
  top: calc(100% + 8px);
  transform: translateY(-8px);
  transition: opacity var(--transition), transform var(--transition);
  z-index: 500;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.nav-dropdown-menu a {
  align-items: center;
  border-radius: 8px;
  color: #102033;
  display: flex;
  font-size: 13px;
  font-weight: 750;
  justify-content: space-between;
  padding: 10px 12px;
  text-decoration: none;
}

.nav-dropdown-menu a::after {
  color: #174ea6;
  content: "->";
  font-family: var(--mono);
  font-size: 11px;
}

.nav-dropdown-menu a:hover,
.nav-dropdown-menu a:focus-visible {
  background: #eef6ff;
  color: #0b2f66;
  outline: none;
}

.pro-hero {
  align-items: center;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  gap: 28px;
  overflow: hidden;
  padding: clamp(26px, 5vw, 58px);
  position: relative;
  text-align: left;
}

.pro-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(37, 99, 235, 0.08), transparent 45%),
    radial-gradient(circle at 88% 16%, rgba(14, 165, 233, 0.15), transparent 28%);
  pointer-events: none;
}

.pro-hero > * {
  position: relative;
  z-index: 1;
}

.pro-hero .hero-content {
  margin: 0;
  max-width: 780px;
}

.pro-hero .brand-badge {
  margin-bottom: 18px;
}

.pro-hero .hero-title {
  max-width: 820px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.hero-visual {
  background:
    linear-gradient(rgba(23, 78, 166, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 78, 166, 0.06) 1px, transparent 1px),
    #ffffff;
  background-size: 24px 24px, 24px 24px, auto;
  border: 1px solid #b8c4d2;
  border-radius: 12px;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
  color: #102033;
  padding: 22px;
}

.hero-meter {
  align-items: center;
  border-bottom: 1px solid #d4dde8;
  display: flex;
  justify-content: space-between;
  padding-bottom: 18px;
}

.hero-meter span {
  color: #174ea6;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-meter strong {
  color: #07111f;
  font-family: var(--mono);
  font-size: clamp(28px, 5vw, 44px);
}

.hero-flow {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: 46px 1fr 46px 1fr 46px;
  margin: 26px 0;
}

.hero-flow span {
  align-items: center;
  background: #eef6ff;
  border: 1px solid #93c5fd;
  color: #0b2f66;
  border-radius: 8px;
  display: flex;
  font-family: var(--mono);
  font-weight: 900;
  height: 46px;
  justify-content: center;
}

.hero-flow i {
  background: linear-gradient(90deg, #60a5fa, #22c55e);
  border-radius: 999px;
  display: block;
  height: 4px;
  overflow: hidden;
  position: relative;
}

.hero-flow i::after {
  animation: hero-flow 1.8s linear infinite;
  background: rgba(255,255,255,0.85);
  border-radius: inherit;
  content: "";
  inset: 0 auto 0 0;
  position: absolute;
  width: 34%;
}

@keyframes hero-flow {
  from { transform: translateX(-120%); }
  to { transform: translateX(320%); }
}

.hero-stat-grid {
  display: grid;
  gap: 10px;
}

.hero-stat-grid div {
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid #d4dde8;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  padding: 12px;
}

.hero-stat-grid strong {
  color: #07111f;
}

.hero-stat-grid span {
  color: #174ea6;
  font-family: var(--mono);
  font-size: 12px;
}

.home-tool-strip {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 0 30px;
}

.home-tool-card {
  background: #fff;
  border: 1px solid #dbe4ef;
  border-radius: 10px;
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.06);
  color: var(--text2);
  min-height: 150px;
  padding: 20px;
  text-decoration: none;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.home-tool-card:hover,
.home-tool-card:focus-visible {
  border-color: #60a5fa;
  box-shadow: 0 16px 36px rgba(37, 99, 235, 0.13);
  outline: none;
  transform: translateY(-3px);
}

.home-tool-card strong {
  color: var(--text);
  display: block;
  font-size: 20px;
  line-height: 1.2;
  margin: 8px 0;
}

.home-tool-kicker {
  color: #1d4ed8;
  display: inline-flex;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.home-tool-card.main-tool {
  border-top: 4px solid #2563eb;
}

.calculator-rules {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 16px;
}

.rule-card {
  background: #f8fafc;
  border: 1px solid #dbe4ef;
  border-radius: 8px;
  min-height: 92px;
  padding: 14px;
}

.rule-card.active {
  background: #eff6ff;
  border-color: #93c5fd;
}

.rule-label {
  color: #64748b;
  display: block;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.rule-card strong {
  color: #0f172a;
  display: block;
  font-size: 13px;
  line-height: 1.45;
}

.premium-rules .rule-card.active {
  background: #fffbeb;
  border-color: #fbbf24;
}

.premium-badge {
  background: #0f172a;
  color: #fff;
}

.premium-card {
  border-color: #dbe4ef;
  background: #fff;
  box-shadow: var(--shadow);
}

.btn-premium {
  background: linear-gradient(135deg, #0f172a, #2563eb);
  color: #fff;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.2);
}

.btn-premium:hover {
  background: linear-gradient(135deg, #1e293b, #1d4ed8);
}

.site-footer {
  background: #0f172a;
  border-top: 0;
  color: #cbd5e1;
}

.footer-heading,
.footer-logo,
.disclaimer-header,
.footer-languages-label {
  color: #ffffff;
}

.footer-link,
.footer-desc,
.disclaimer-text,
.footer-bottom {
  color: #cbd5e1;
}

.footer-disclaimer,
.footer-languages {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(148, 163, 184, 0.24);
}

@media (max-width: 980px) {
  .pro-hero,
  .home-tool-strip,
  .calculator-rules {
    grid-template-columns: 1fr;
  }

  .pro-hero {
    text-align: left;
  }
}

@media (max-width: 680px) {
  .pro-header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .pro-nav {
    overflow: visible;
    width: 100%;
  }

  .pro-nav .nav-link {
    flex: 0 0 auto;
  }

  .nav-dropdown {
    width: 100%;
  }

  .nav-dropdown-toggle {
    width: 100%;
  }

  .nav-dropdown-menu {
    left: 0;
    min-width: min(100%, 320px);
    position: absolute;
    width: 100%;
  }

  .nav-dropdown:hover .nav-dropdown-menu,
  .nav-dropdown:focus-within .nav-dropdown-menu {
    transform: translateY(0);
  }

  .hero-stat-grid div,
  .hero-meter {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }
}

/* ===== LIGHT INDUSTRIAL BRAND SYSTEM ===== */
.ultra-glass {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 0;
  box-shadow: none;
  margin: 0 auto;
  padding: 8px 20px;
}

.ultra-logo {
  letter-spacing: 0;
  text-shadow: none;
}

.ultra-3d svg {
  animation: none;
  filter: none;
}

.ultra-gradient {
  background: none;
  color: #0f172a;
  -webkit-text-fill-color: currentColor;
}

.ultra-link {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  box-shadow: none;
  color: #334155;
  font-size: 13px;
  padding: 8px 12px;
}

.ultra-link:hover,
.ultra-link:focus {
  background: #eff6ff;
  border-color: #bfdbfe;
  box-shadow: none;
  color: #1d4ed8;
}

.brand-header {
  background:
    linear-gradient(135deg, rgba(239, 246, 255, 0.96), rgba(255, 255, 255, 0.98)),
    #ffffff;
  border: 1px solid #dbe4ef;
  box-shadow: 0 14px 36px rgba(15, 23, 42, 0.06);
}

.card,
.visual-panel,
.tool-card {
  border-color: #dbe4ef;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

.circuit-diagram-card,
.battery-diagram-card,
.power-diagram-card,
.tool-card-visual {
  background:
    linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border: 1px solid #dbe4ef;
  border-radius: 10px;
}

.visual-row {
  background: #f8fafc;
  border-color: #dbe4ef;
}

.tools-grid {
  align-items: stretch;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.topical-tools-grid .tool-card-link:nth-child(1) { order: 3; }
.topical-tools-grid .tool-card-link:nth-child(2) { order: 1; }
.topical-tools-grid .tool-card-link:nth-child(3) { order: 2; }
.topical-tools-grid .tool-card-link:nth-child(4) { order: 5; }
.topical-tools-grid .tool-card-link:nth-child(5) { order: 4; }
.topical-tools-grid .tool-card-link:nth-child(6) { order: 6; }

.topical-tools-grid .tool-card::after {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  color: #1d4ed8;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  padding: 5px 9px;
  position: absolute;
  right: 14px;
  text-transform: uppercase;
  top: 14px;
}

.topical-tools-grid .tool-card-link:nth-child(1) .tool-card::after { content: "Energy Storage"; }
.topical-tools-grid .tool-card-link:nth-child(2) .tool-card::after { content: "Core Conversion"; }
.topical-tools-grid .tool-card-link:nth-child(3) .tool-card::after { content: "Core Conversion"; }
.topical-tools-grid .tool-card-link:nth-child(4) .tool-card::after { content: "Distribution"; }
.topical-tools-grid .tool-card-link:nth-child(5) .tool-card::after { content: "Power Quality"; }
.topical-tools-grid .tool-card-link:nth-child(6) .tool-card::after { content: "Installation"; }

.tool-card {
  min-height: 0;
  position: relative;
}

.tool-card::before {
  background: linear-gradient(180deg, #2563eb, #38bdf8);
  border-radius: 10px 0 0 10px;
  content: "";
  inset: 0 auto 0 0;
  position: absolute;
  width: 4px;
}

.tool-card:hover {
  box-shadow: 0 18px 42px rgba(37, 99, 235, 0.12);
}

.tool-description,
.tool-use-case {
  color: #475569;
}

.footer-inner {
  align-items: start;
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(220px, 1.2fr) minmax(220px, 1fr) minmax(240px, 1fr);
  margin: 0 auto;
  max-width: 1320px;
}

.footer-inner .footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-inner .footer-nav a {
  background: #ffffff;
  border: 1px solid #dbe4ef;
  border-radius: 8px;
  padding: 8px 10px;
  text-decoration: none;
}

.tool-topology {
  background: #ffffff;
  border: 1px solid #dbe4ef;
  border-radius: 12px;
  box-shadow: 0 12px 34px rgba(15, 23, 42, 0.06);
  margin: 0 0 30px;
  padding: clamp(18px, 3vw, 28px);
}

.topology-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.topology-header h2 {
  color: #0f172a;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.1;
  margin: 0;
}

.topology-rail {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: auto 1fr auto 1fr auto 1fr auto;
  margin-bottom: 18px;
}

.topology-rail span {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  color: #1d4ed8;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
  padding: 8px 10px;
  text-transform: uppercase;
  white-space: nowrap;
}

.topology-rail i {
  background: linear-gradient(90deg, #93c5fd, #22c55e);
  border-radius: 999px;
  display: block;
  height: 4px;
}

.topology-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.topology-card {
  background: #f8fafc;
  border: 1px solid #dbe4ef;
  border-radius: 10px;
  color: #475569;
  min-height: 128px;
  padding: 16px;
  text-decoration: none;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.topology-card:hover,
.topology-card:focus-visible {
  border-color: #60a5fa;
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.12);
  outline: none;
  transform: translateY(-3px);
}

.topology-card span {
  color: #2563eb;
  display: block;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.topology-card strong {
  color: #0f172a;
  display: block;
  font-size: 18px;
  line-height: 1.2;
  margin: 8px 0;
}

.topology-card small {
  color: #64748b;
  font-family: var(--mono);
}

.topology-card.primary {
  background: linear-gradient(135deg, #eff6ff, #ffffff);
  border-color: #93c5fd;
}

.site-footer {
  background: linear-gradient(180deg, #ffffff, #f1f5f9);
  border-top: 1px solid #dbe4ef;
  box-shadow: 0 -8px 24px rgba(15, 23, 42, 0.04);
  color: #475569;
}

.footer-heading,
.footer-logo,
.disclaimer-header,
.footer-languages-label {
  color: #0f172a;
}

.footer-link,
.footer-desc,
.disclaimer-text,
.footer-bottom,
.footer-tagline,
.footer-meta {
  color: #475569;
}

.footer-disclaimer,
.footer-languages {
  background: #f8fafc;
  border-color: #dbe4ef;
}

.footer-nav a {
  color: #334155;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: #1d4ed8;
}

@media (max-width: 760px) {
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .topology-rail {
    grid-template-columns: 1fr;
  }

  .topology-rail i {
    height: 18px;
    justify-self: center;
    width: 4px;
  }
}

:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface2: #eef3f8;
  --border: #b8c4d2;
  --border-light: #d4dde8;
  --border-strong: #64748b;
  --primary: #174ea6;
  --primary-light: #2563eb;
  --primary-dark: #0b2f66;
  --text: #07111f;
  --text2: #1e293b;
  --text3: #475569;
  --text4: #64748b;
}

body {
  color: var(--text);
}

.hero-title {
  background: none;
  color: #07111f;
  -webkit-text-fill-color: currentColor;
}

.hero-subtitle,
.content-p,
.tool-description,
.tool-use-case,
.faq-a p {
  color: #1e293b;
}

.highlight-intro {
  background: #eef6ff;
  border-left-color: #174ea6;
  color: #102033;
}

.section-divider h2,
.content-h3,
.tool-card-title {
  color: #07111f;
}

.visual-label,
label {
  color: #334155;
}

.diagram-label {
  fill: #1e293b;
}

.diagram-value {
  fill: #07111f;
}

input,
select {
  background: #ffffff;
  border-color: #aebdcb;
  color: #07111f;
}

/* ===== INDUSTRIAL READABILITY AND PERFORMANCE SYSTEM ===== */
:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface2: #f1f5f9;
  --border: #d4dbe3;
  --border-light: #e5eaf0;
  --border-strong: #8b98a8;
  --primary: #1d4ed8;
  --primary-light: #2563eb;
  --primary-dark: #163f9f;
  --primary-glow: rgba(29, 78, 216, 0.12);
  --accent-gold: #b7791f;
  --accent-cyan: #0f766e;
  --accent-blue: #1d4ed8;
  --accent-purple: #4f46e5;
  --accent-green: #15803d;
  --accent-orange: #b45309;
  --text: #111827;
  --text2: #273240;
  --text3: #4b5563;
  --text4: #6b7280;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.06);
  --shadow: 0 2px 8px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 4px 14px rgba(17, 24, 39, 0.1);
  --transition: 120ms ease;
}

html {
  scroll-padding-top: 86px;
}

body {
  background: var(--bg);
  color: var(--text);
  text-rendering: optimizeLegibility;
}

body::before,
body::after,
.brand-header::before,
.hero-visual::before,
.hero-visual::after,
.tool-topology::before,
.tool-topology::after {
  content: none !important;
  display: none !important;
}

.container {
  max-width: 1180px;
}

.premium-header,
.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  box-shadow: none;
  margin: 0 0 24px;
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.premium-header-inner {
  align-items: center;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1180px;
  min-height: 70px;
  padding: 0 18px;
}

.premium-brand,
.premium-footer-logo {
  align-items: center;
  color: var(--text);
  display: inline-flex;
  gap: 11px;
  min-width: 0;
  text-decoration: none;
}

.premium-brand-mark {
  align-items: center;
  background: #1f2937;
  border: 1px solid #111827;
  border-radius: 7px;
  box-shadow: none;
  color: #ffffff;
  display: inline-flex;
  flex: 0 0 40px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 800;
  height: 40px;
  justify-content: center;
  letter-spacing: 0;
}

.premium-brand-copy {
  display: grid;
  gap: 2px;
  line-height: 1.1;
}

.premium-brand-name {
  color: var(--text);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0;
}

.premium-brand-line {
  color: var(--text4);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.premium-nav {
  align-items: center;
  display: flex;
  gap: 4px;
}

.premium-nav-link,
.premium-nav-menu > summary {
  align-items: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--text2);
  cursor: pointer;
  display: inline-flex;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  min-height: 40px;
  padding: 9px 11px;
  text-decoration: none;
}

.premium-nav-link:hover,
.premium-nav-link:focus-visible,
.premium-nav-menu > summary:hover,
.premium-nav-menu > summary:focus-visible {
  background: var(--surface2);
  border-color: var(--border);
  color: var(--primary);
  outline: none;
}

.premium-nav-menu {
  position: relative;
}

.premium-nav-menu > summary {
  list-style: none;
}

.premium-nav-menu > summary::-webkit-details-marker {
  display: none;
}

.premium-nav-menu > summary::after {
  border-bottom: 2px solid currentColor;
  border-right: 2px solid currentColor;
  content: "";
  height: 6px;
  margin-left: 8px;
  transform: rotate(45deg) translateY(-2px);
  width: 6px;
}

.premium-nav-panel {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  display: grid;
  gap: 2px;
  left: 0;
  min-width: 280px;
  opacity: 0;
  padding: 6px;
  pointer-events: none;
  position: absolute;
  top: calc(100% + 8px);
  transform: translateY(-2px);
  transition: opacity var(--transition), transform var(--transition);
  z-index: 120;
}

.premium-nav-menu[open] .premium-nav-panel {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.premium-nav-panel a {
  border-radius: 6px;
  color: var(--text2);
  display: grid;
  gap: 2px;
  padding: 10px;
  text-decoration: none;
}

.premium-nav-panel a:hover,
.premium-nav-panel a:focus-visible {
  background: var(--surface2);
  color: var(--primary);
  outline: none;
}

.premium-nav-panel span {
  font-weight: 800;
}

.premium-nav-panel small {
  color: var(--text4);
  font-size: 12px;
}

.premium-nav-panel.compact {
  min-width: 210px;
}

.premium-menu-button {
  align-items: center;
  background: #1f2937;
  border: 0;
  border-radius: 7px;
  box-shadow: none;
  display: none;
  height: 40px;
  justify-content: center;
  position: relative;
  width: 44px;
}

.premium-menu-button span {
  background: #ffffff;
  border-radius: 999px;
  display: block;
  height: 2px;
  position: absolute;
  width: 19px;
}

.premium-menu-button span:nth-child(1) { transform: translateY(-6px); }
.premium-menu-button span:nth-child(3) { transform: translateY(6px); }

.brand-header,
.pro-hero {
  background: #ffffff;
  border: 1px solid var(--border);
  border-left: 5px solid var(--primary);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  color: var(--text);
  overflow: visible;
  padding: clamp(24px, 4vw, 42px);
}

.brand-badge {
  background: #eef4ff;
  border: 1px solid #c7d7fe;
  border-radius: 6px;
  color: var(--primary-dark);
  letter-spacing: 0.06em;
}

.brand-badge-dot {
  background: var(--primary);
}

.hero-title {
  background: none !important;
  color: var(--text) !important;
  max-width: 880px;
  text-wrap: balance;
  -webkit-text-fill-color: currentColor !important;
}

.hero-content,
.hero-subtitle {
  color: var(--text2);
  max-width: 900px;
}

.highlight-intro {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-cyan);
  color: var(--text2);
}

.hero-visual,
.card,
.visual-panel,
.result-panel,
.tool-card,
.legal-card,
.tool-topology,
.circuit-diagram-card,
.battery-diagram-card,
.table-wrap,
.formula-display,
.example-box,
.highlight-box,
.result-mini {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: none;
}

.card:hover,
.tool-card:hover,
.tool-card:focus-visible,
.topology-card:hover,
.topology-card:focus-visible {
  border-color: var(--border-strong);
  box-shadow: none;
  transform: none;
}

.section-divider {
  margin-top: 36px;
}

.section-divider h2,
.content-h3,
.tool-card-title,
.visual-header,
.footer-heading,
label {
  color: var(--text);
  letter-spacing: 0;
}

.icon-circle {
  background: #1f2937;
  border-radius: 7px;
  box-shadow: none;
  color: #ffffff;
}

.btn,
button,
input,
select,
textarea,
.reference-table,
.lang-btn {
  border-radius: 6px;
}

input,
select,
textarea {
  background: #ffffff;
  border: 1px solid var(--border-strong);
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.14);
  outline: none;
}

.btn-primary,
.calc-btn {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: none;
  color: #ffffff;
}

.btn-primary:hover,
.calc-btn:hover,
.btn-primary:focus-visible,
.calc-btn:focus-visible {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  box-shadow: none;
}

.btn-outline,
.copy-btn,
.export-btn,
.lang-btn {
  background: #ffffff;
  border: 1px solid var(--border-strong);
  color: var(--text2);
}

.btn-outline:hover,
.copy-btn:hover,
.export-btn:hover,
.lang-btn:hover {
  background: var(--surface2);
  color: var(--primary);
}

.reference-table th {
  background: #1f2937;
  color: #ffffff;
}

.reference-table td {
  color: var(--text2);
}

.diagram-label {
  fill: var(--text2);
}

.diagram-value {
  fill: var(--text);
}

.tool-topology,
.topology-card {
  background: #ffffff;
}

.topology-rail span {
  background: #eef4ff;
  border-color: #c7d7fe;
  color: var(--primary-dark);
}

.topology-rail i {
  background: #9aa7b7;
}

.premium-footer,
.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border);
  box-shadow: none;
  color: var(--text3);
  margin-top: 48px;
  padding: 0;
}

.premium-footer-inner {
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(250px, 1.2fr) repeat(3, minmax(180px, 1fr));
  margin: 0 auto;
  max-width: 1180px;
  padding: 34px 18px 24px;
}

.premium-footer-logo {
  color: var(--text);
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 12px;
}

.premium-footer-brand p,
.premium-footer-note,
.premium-footer-bottom p {
  color: var(--text3);
}

.premium-footer-note {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 13px;
  padding: 11px;
}

.premium-footer h3 {
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.06em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

.premium-footer-links {
  display: grid;
  gap: 8px;
}

.premium-footer-links a {
  color: var(--text3);
  font-size: 14px;
  text-decoration: none;
}

.premium-footer-links a:hover,
.premium-footer-links a:focus-visible {
  color: var(--primary);
  outline: none;
}

.premium-footer-bottom {
  border-top: 1px solid var(--border);
  margin: 0 auto;
  max-width: 1180px;
  padding: 16px 18px 22px;
}

.premium-flow,
.flow-particle,
.wire-path,
.load-meter-fill,
.brand-badge-dot,
.ultra-3d svg {
  animation: none !important;
  filter: none !important;
}

* {
  text-shadow: none !important;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 980px) {
  .premium-menu-button {
    display: inline-flex;
  }

  .premium-nav {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: none;
    left: 14px;
    padding: 10px;
    position: absolute;
    right: 14px;
    top: calc(100% + 8px);
  }

  .premium-nav.is-open {
    display: grid;
  }

  .premium-nav-link,
  .premium-nav-menu > summary {
    justify-content: space-between;
    width: 100%;
  }

  .premium-nav-panel {
    box-shadow: none;
    margin-top: 7px;
    min-width: 0;
    opacity: 1;
    pointer-events: auto;
    position: static;
    transform: none;
    width: 100%;
  }

  .premium-footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .premium-header-inner {
    min-height: 64px;
    padding: 0 14px;
  }

  .premium-brand-line {
    display: none;
  }

  .premium-footer-inner {
    grid-template-columns: 1fr;
  }

  .brand-header,
  .pro-hero {
    padding: 22px 18px;
  }
}


/* ===== MODERN INDUSTRIAL TYPOGRAPHY SYSTEM ===== */
:root {
  --font: "Segoe UI Variable Text", "Segoe UI", Aptos, "Helvetica Neue", Arial, sans-serif;
  --display-font: Bahnschrift, "DIN Alternate", "Segoe UI Variable Display", "Segoe UI", Arial, sans-serif;
  --mono: "Cascadia Mono", "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

body {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  letter-spacing: 0;
}

h1,
h2,
h3,
h4,
.hero-title,
.section-divider h2,
.section-divider .section-heading,
.content-h3,
.tool-card-title,
.visual-header,
.premium-brand-name,
.premium-footer-logo,
.premium-footer h3,
.footer-section-heading,
.result-mini-val {
  font-family: var(--display-font);
  letter-spacing: 0;
}

.hero-title {
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 700;
  line-height: 0.98;
}

.section-divider h2,
.section-divider .section-heading {
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 700;
  line-height: 1.08;
}

.content-h3,
.tool-card-title,
.visual-header,
.footer-section-heading {
  font-weight: 700;
  line-height: 1.16;
}

.hero-subtitle,
.content-p,
.legal-card p,
.legal-card li,
.tool-description,
.tool-use-case,
.faq-a p {
  font-size: 16px;
  line-height: 1.72;
}

.premium-brand-name {
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}

.premium-brand-line,
.brand-badge,
.footer-languages-label,
.visual-label,
label,
.result-mini-unit,
.metric-label,
.detail-label {
  font-family: var(--display-font);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.premium-nav-link,
.premium-nav-menu > summary,
.premium-nav-panel span,
.btn,
.calc-btn,
button,
.tool-card button {
  font-family: var(--display-font);
  font-weight: 700;
  letter-spacing: 0.01em;
}

input,
select,
textarea {
  font-family: var(--font);
  font-size: 16px;
}

.premium-brand-mark,
.result-mini-val,
.diagram-value,
.visual-value,
.metric-value,
.formula-display,
.reference-table td,
.reference-table th {
  font-family: var(--mono);
}

.premium-brand-mark {
  font-size: 13px;
  letter-spacing: 0.02em;
}

.result-mini-val {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.formula-display {
  font-size: clamp(16px, 2vw, 20px);
}

.reference-table th {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.premium-footer-links a,
.premium-nav-panel small {
  font-family: var(--font);
}

@media (max-width: 640px) {
  .hero-title {
    font-size: clamp(30px, 10vw, 42px);
    line-height: 1.03;
  }

  .premium-brand-name {
    font-size: 18px;
  }
}

/* ===== WATTS TO AMPS MATCHING CIRCUIT DIAGRAM ===== */
.premium-diagram {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
}

.premium-diagram .power-house-diagram {
  background: #f8fafc;
}

.premium-wire-flow {
  stroke: url(#premium-wire-gradient);
}

.circuit-status.premium {
  background: #eef4ff;
  border: 1px solid #c7d7fe;
  color: var(--primary-dark);
}

.premium-card {
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: none;
}

.premium-badge {
  background: #1f2937;
  border-radius: 6px;
  box-shadow: none;
  color: #ffffff;
}

.premium-result,
.premium-details,
.premium-metrics .visual-metric {
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: none;
}

.btn-premium {
  background: var(--primary);
  border: 1px solid var(--primary);
  box-shadow: none;
  color: #ffffff;
}

.btn-premium:hover,
.btn-premium:focus-visible {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  box-shadow: none;
  transform: none;
}

/* ===== CONTENT TECHNICAL VISUAL AIDS ===== */
.content-visual-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  margin: 18px 0 24px;
}

.technical-visual-card,
.process-step-card {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  min-height: 118px;
  padding: 14px;
}

.technical-visual-card strong,
.process-step-card strong {
  color: var(--text);
  font-family: var(--display-font);
  font-size: 16px;
  line-height: 1.15;
}

.technical-visual-card small,
.process-step-card small {
  color: var(--text3);
  font-size: 13px;
  line-height: 1.45;
}

.mini-circuit {
  align-items: center;
  display: grid;
  gap: 8px;
  grid-template-columns: auto 1fr auto 1fr auto;
  min-height: 44px;
}

.mini-node {
  align-items: center;
  background: #ffffff;
  border: 2px solid var(--border-strong);
  border-radius: 7px;
  color: var(--text);
  display: inline-flex;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 800;
  height: 38px;
  justify-content: center;
  width: 38px;
}

.mini-node.source {
  border-color: var(--primary);
  color: var(--primary-dark);
}

.mini-node.current {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.mini-node.load {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.mini-wire {
  background: var(--border-strong);
  display: block;
  height: 3px;
}

.value-stack {
  gap: 7px;
}

.value-stack span {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  color: var(--text3);
  display: flex;
  gap: 10px;
  min-height: 32px;
  padding: 7px 9px;
}

.value-stack b {
  color: var(--text);
  font-family: var(--mono);
  min-width: 54px;
}

.formula-chip-card {
  align-content: center;
}

.formula-chip {
  background: #ffffff;
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--primary);
  border-radius: 7px;
  color: var(--text);
  display: block;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 800;
  padding: 10px 12px;
}

.mini-svg-diagram {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: block;
  height: auto;
  width: 100%;
}

.mini-svg-diagram text {
  fill: var(--text2);
  font-family: var(--display-font);
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
}

.svg-source {
  fill: #eef4ff;
  stroke: var(--primary);
  stroke-width: 3;
}

.svg-load {
  fill: #ecfdf5;
  stroke: var(--accent-cyan);
  stroke-width: 3;
}

.svg-wire,
.svg-wave,
.triangle-line {
  fill: none;
  stroke: var(--primary);
  stroke-linecap: round;
  stroke-width: 4;
}

.svg-wire.muted {
  stroke: var(--border-strong);
  stroke-width: 2;
}

.svg-wave.secondary {
  stroke: var(--accent-cyan);
}

.svg-wave.tertiary {
  stroke: var(--accent-green);
}

.triangle-fill {
  fill: #eef4ff;
}

.triangle-line {
  stroke: var(--border-strong);
}

.triangle-line.strong {
  stroke: var(--primary);
}

.process-visual-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.process-step-card span,
.safety-check-card span {
  align-items: center;
  background: #1f2937;
  border-radius: 7px;
  color: #ffffff;
  display: inline-flex;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 800;
  height: 36px;
  justify-content: center;
  width: 48px;
}

.scale-card {
  gap: 9px;
}

.scale-card span {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: 56px 1fr 95px;
}

.scale-card b,
.scale-card em {
  color: var(--text2);
  font-family: var(--mono);
  font-size: 13px;
  font-style: normal;
}

.scale-card i {
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  border-radius: 999px;
  display: block;
  height: 8px;
  max-width: 100%;
  width: var(--bar);
}

.safety-visual-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.safety-check-card {
  min-height: 132px;
}

@media (max-width: 640px) {
  .content-visual-grid {
    grid-template-columns: 1fr;
  }

  .scale-card span {
    grid-template-columns: 54px 1fr;
  }

  .scale-card em {
    grid-column: 1 / -1;
  }
}

.section-divider .section-heading {
  color: var(--text);
  margin: 0;
}

.footer-section-heading {
  color: var(--text);
  font-size: 13px;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.topic-article-visual {
  align-items: stretch;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(280px, 1.35fr) minmax(220px, 0.75fr);
  margin-bottom: 20px;
  padding: 16px;
}

.topic-diagram-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  min-height: 190px;
  padding: 10px;
}

.topic-circuit-svg {
  display: block;
  height: 100%;
  min-height: 174px;
  width: 100%;
}

.topic-circuit-svg text {
  fill: var(--text);
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 800;
  text-anchor: middle;
}

.topic-svg-box {
  fill: #eef4ff;
  stroke: var(--primary);
  stroke-width: 3;
}

.topic-svg-box.alt {
  fill: #ecfdf5;
  stroke: var(--accent-cyan);
}

.topic-svg-core {
  fill: #1f2937;
  stroke: #111827;
  stroke-width: 3;
}

.topic-svg-output {
  fill: #fff7ed;
  stroke: var(--accent-orange);
  stroke-width: 3;
}

.topic-circuit-svg .topic-core-text {
  fill: #ffffff;
}

.topic-svg-wire {
  fill: none;
  stroke: var(--primary);
  stroke-linecap: round;
  stroke-width: 4;
}

.topic-signal-grid {
  display: grid;
  gap: 10px;
}

.topic-signal-grid span {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: grid;
  gap: 5px;
  min-height: 54px;
  padding: 10px 12px;
}

.topic-signal-grid b {
  color: var(--text);
  font-family: var(--display-font);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.topic-signal-grid em {
  color: var(--text3);
  font-family: var(--mono);
  font-size: 13px;
  font-style: normal;
}

.topic-block {
  align-items: start;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  gap: 14px;
  grid-template-columns: 62px 1fr;
  margin-top: 12px;
  padding: 16px;
  position: relative;
}

.topic-block::after {
  background: linear-gradient(180deg, var(--primary), var(--accent-cyan));
  border-radius: 999px;
  bottom: 14px;
  content: "";
  left: 0;
  position: absolute;
  top: 14px;
  width: 3px;
}

.topic-block.topic-sub {
  background: #f8fafc;
  grid-template-columns: 56px 1fr;
  margin-left: 28px;
}

.topic-block.topic-feature {
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  grid-template-columns: 72px 1fr;
  padding: 18px;
}

.topic-icon {
  align-items: center;
  background: #1f2937;
  border-radius: 7px;
  color: #ffffff;
  display: inline-flex;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 800;
  height: 44px;
  justify-content: center;
  line-height: 1;
  padding: 0 6px;
  text-align: center;
}

.topic-sub .topic-icon {
  background: #ffffff;
  border: 1px solid var(--border-strong);
  color: var(--primary-dark);
}

.topic-copy h2,
.topical-query-section h2 {
  color: var(--text);
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.15;
  margin: 0 0 8px;
  padding: 0;
}

.topic-copy .content-h3 {
  color: var(--text);
  font-size: clamp(17px, 1.8vw, 22px);
  margin: 0 0 8px;
}

.topic-copy .content-p {
  margin: 0 0 10px;
}

.topic-copy .content-p:last-child {
  margin-bottom: 0;
}

.topic-inline-visual,
.topic-equation-strip,
.topic-step-row,
.topic-reverse-visual,
.topic-compare-grid,
.topic-relation-grid,
.topic-formula-grid,
.topic-value-cards,
.topic-dashboard-mini,
.topic-scale-list {
  margin-top: 12px;
}

.topic-inline-visual,
.topic-equation-strip,
.topic-reverse-visual {
  align-items: center;
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 24px 1fr 24px 1fr;
  padding: 12px;
}

.topic-inline-visual span,
.topic-equation-strip span,
.topic-reverse-visual span,
.topic-step-row span,
.topic-compare-grid span,
.topic-relation-grid span,
.topic-formula-grid span,
.topic-value-cards span,
.topic-dashboard-mini span,
.topic-scale-list span {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 7px;
  display: grid;
  gap: 3px;
  min-height: 52px;
  padding: 9px 10px;
}

.topic-inline-visual b,
.topic-equation-strip b,
.topic-reverse-visual b,
.topic-step-row b,
.topic-compare-grid b,
.topic-relation-grid b,
.topic-formula-grid strong,
.topic-value-cards b,
.topic-dashboard-mini b,
.topic-scale-list b {
  color: var(--text);
  font-family: var(--display-font);
  font-size: 13px;
  font-weight: 800;
}

.topic-inline-visual em,
.topic-equation-strip em,
.topic-reverse-visual em,
.topic-step-row em,
.topic-compare-grid em,
.topic-relation-grid em,
.topic-value-cards em,
.topic-scale-list em {
  color: var(--text3);
  font-size: 12px;
  font-style: normal;
  line-height: 1.35;
}

.topic-inline-visual i {
  background: var(--primary);
  display: block;
  height: 3px;
  position: relative;
}

.topic-inline-visual i::after {
  border-bottom: 5px solid transparent;
  border-left: 7px solid var(--primary);
  border-top: 5px solid transparent;
  content: "";
  position: absolute;
  right: -2px;
  top: -3.5px;
}

.topic-formula-grid,
.topic-value-cards,
.topic-dashboard-mini,
.topic-step-row,
.topic-compare-grid,
.topic-relation-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.topic-formula-grid code {
  color: var(--primary-dark);
  font-family: var(--mono);
  font-size: 13px;
  white-space: normal;
}

.topic-equation-strip,
.topic-reverse-visual {
  grid-template-columns: 1fr 28px 1fr 28px 1fr;
}

.topic-equation-strip > strong,
.topic-reverse-visual > strong {
  color: var(--primary);
  font-family: var(--mono);
  font-size: 20px;
  text-align: center;
}

.topic-step-row span {
  border-left: 4px solid var(--primary);
}

.topic-dashboard-mini span {
  background: #1f2937;
  border-color: #111827;
}

.topic-dashboard-mini small {
  color: #cbd5e1;
  font-family: var(--display-font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.topic-dashboard-mini b {
  color: #ffffff;
  font-family: var(--mono);
  font-size: 18px;
}

.topic-scale-list {
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  padding: 12px;
}

.topic-scale-list span {
  align-items: center;
  grid-template-columns: 58px 1fr 72px;
  min-height: 38px;
}

.topic-scale-list i {
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  border-radius: 999px;
  display: block;
  height: 8px;
  width: var(--bar);
}

.topic-compare-grid span:first-child {
  border-left: 4px solid var(--accent-cyan);
}

.topic-compare-grid span:last-child {
  border-left: 4px solid var(--accent-orange);
}

.topic-mini-diagram,
.topic-mini-card-grid,
.topic-phase-diagram {
  margin-top: 12px;
}

.topic-mini-diagram {
  align-items: center;
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 24px 1fr 24px 1fr;
  padding: 12px;
}

.topic-mini-diagram span,
.topic-mini-card-grid span {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 7px;
  display: grid;
  gap: 3px;
  min-height: 52px;
  padding: 9px 10px;
}

.topic-mini-diagram b,
.topic-mini-card-grid b {
  color: var(--text);
  font-family: var(--display-font);
  font-size: 13px;
  font-weight: 800;
}

.topic-mini-diagram em {
  color: var(--text3);
  font-size: 12px;
  font-style: normal;
  line-height: 1.35;
}

.topic-mini-diagram i {
  background: var(--primary);
  display: block;
  height: 3px;
  position: relative;
}

.topic-mini-diagram i::after {
  border-bottom: 5px solid transparent;
  border-left: 7px solid var(--primary);
  border-top: 5px solid transparent;
  content: "";
  position: absolute;
  right: -2px;
  top: -3.5px;
}

.topic-mini-card-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(135px, 1fr));
}

.topic-mini-card-grid code {
  color: var(--primary-dark);
  font-family: var(--mono);
  font-size: 13px;
  white-space: normal;
}

.topic-wave-diagram {
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  margin-top: 12px;
  padding: 10px;
}

.topic-wave-diagram svg {
  display: block;
  width: 100%;
}

.topic-wave-diagram path {
  fill: none;
  stroke: var(--primary);
  stroke-linecap: round;
  stroke-width: 5;
}

.topic-wave-diagram line {
  stroke: var(--border-strong);
  stroke-width: 2;
}

.topic-wave-diagram text {
  fill: var(--text2);
  font-family: var(--display-font);
  font-size: 13px;
  font-weight: 800;
}

.topic-phase-diagram {
  align-items: center;
  background: #1f2937;
  border-radius: 8px;
  color: #ffffff;
  display: grid;
  gap: 10px;
  grid-template-columns: auto 1fr auto 1fr auto minmax(180px, 1fr);
  padding: 12px;
}

.topic-phase-diagram span {
  align-items: center;
  background: #ffffff;
  border-radius: 7px;
  color: var(--primary-dark);
  display: inline-flex;
  font-family: var(--mono);
  font-weight: 800;
  height: 38px;
  justify-content: center;
  width: 42px;
}

.topic-phase-diagram i {
  background: #94a3b8;
  display: block;
  height: 3px;
}

.topic-phase-diagram strong {
  color: #ffffff;
  font-family: var(--mono);
  font-size: 13px;
}

.keyword-guides-card {
  display: grid;
  gap: 14px;
}

.keyword-guides-intro {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-cyan);
  border-radius: 8px;
  padding: 16px;
}

.keyword-guides-intro strong {
  color: var(--text);
  display: block;
  font-family: var(--display-font);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.2;
  margin-bottom: 8px;
}

.keyword-guides-intro .content-p {
  margin: 0;
}

.keyword-guide-block {
  align-items: start;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  gap: 14px;
  grid-template-columns: 72px 1fr;
  padding: 18px;
  position: relative;
}

.keyword-guide-block::after {
  background: linear-gradient(180deg, var(--accent-cyan), var(--primary));
  border-radius: 999px;
  bottom: 14px;
  content: "";
  left: 0;
  position: absolute;
  top: 14px;
  width: 3px;
}

.keyword-guide-icon {
  align-items: center;
  background: #1f2937;
  border-radius: 7px;
  color: #ffffff;
  display: inline-flex;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 800;
  height: 44px;
  justify-content: center;
  line-height: 1;
  padding: 0 6px;
  text-align: center;
}

.keyword-guide-copy h2 {
  color: var(--text);
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.15;
  margin: 0 0 8px;
}

.keyword-guide-copy .content-p {
  margin: 0 0 10px;
}

.keyword-guide-copy .content-p:last-child {
  margin-bottom: 0;
}

.keyword-flow-visual,
.keyword-formula-visual {
  align-items: center;
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 24px 1fr 24px 1fr;
  margin-top: 12px;
  padding: 12px;
}

.keyword-flow-visual span,
.keyword-formula-visual span,
.keyword-card-visual span,
.keyword-chart-visual span {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 7px;
  display: grid;
  gap: 3px;
  min-height: 52px;
  padding: 9px 10px;
}

.keyword-flow-visual b,
.keyword-formula-visual b,
.keyword-card-visual b,
.keyword-chart-visual b,
.keyword-scale-visual b {
  color: var(--text);
  font-family: var(--display-font);
  font-size: 13px;
  font-weight: 800;
}

.keyword-flow-visual em,
.keyword-formula-visual em,
.keyword-chart-visual em,
.keyword-scale-visual em {
  color: var(--text3);
  font-size: 12px;
  font-style: normal;
  line-height: 1.35;
}

.keyword-flow-visual i,
.keyword-formula-visual i {
  background: var(--primary);
  display: block;
  height: 3px;
  position: relative;
}

.keyword-flow-visual i::after,
.keyword-formula-visual i::after {
  border-bottom: 5px solid transparent;
  border-left: 7px solid var(--primary);
  border-top: 5px solid transparent;
  content: "";
  position: absolute;
  right: -2px;
  top: -3.5px;
}

.keyword-card-visual,
.keyword-chart-visual {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  margin-top: 12px;
}

.keyword-card-visual code {
  color: var(--primary-dark);
  font-family: var(--mono);
  font-size: 13px;
  white-space: normal;
}

.keyword-chart-visual span {
  border-left: 4px solid var(--primary);
}

.keyword-scale-visual {
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding: 12px;
}

.keyword-scale-visual span {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 7px;
  display: grid;
  gap: 10px;
  grid-template-columns: 92px 1fr 100px;
  min-height: 40px;
  padding: 8px 10px;
}

.keyword-scale-visual i {
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  border-radius: 999px;
  display: block;
  height: 8px;
  width: var(--bar);
}

.topical-hub-card {
  display: grid;
  gap: 16px;
}

.topical-hub-intro {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  padding: 16px;
}

.topical-hub-intro strong {
  color: var(--text);
  display: block;
  font-family: var(--display-font);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.2;
  margin-bottom: 8px;
}

.topical-hub-intro .content-p {
  margin: 0;
}

.topical-hub-groups {
  display: grid;
  gap: 14px;
}

.topical-hub-group {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}

.topical-hub-heading {
  align-items: start;
  display: grid;
  gap: 12px;
  grid-template-columns: 48px 1fr;
  margin-bottom: 12px;
}

.topical-hub-heading span {
  align-items: center;
  background: #1f2937;
  border-radius: 7px;
  color: #ffffff;
  display: inline-flex;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 800;
  height: 42px;
  justify-content: center;
}

.topical-hub-heading h2 {
  color: var(--text);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.15;
  margin: 0 0 4px;
}

.topical-hub-heading p {
  color: var(--text3);
  font-size: 14px;
  line-height: 1.45;
  margin: 0;
}

.topical-link-grid {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.topical-link-grid a {
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 7px;
  display: grid;
  gap: 3px;
  min-height: 58px;
  padding: 10px 11px;
  text-decoration: none;
}

.topical-link-grid a:hover,
.topical-link-grid a:focus-visible {
  background: #eef4ff;
  border-color: #c7d7fe;
  outline: none;
}

.topical-link-grid b {
  color: var(--text);
  font-family: var(--display-font);
  font-size: 14px;
  line-height: 1.2;
}

.topical-link-grid small {
  color: var(--text3);
  font-size: 12px;
  line-height: 1.3;
}

.topical-hub-visual {
  align-items: center;
  background: #1f2937;
  border-radius: 8px;
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 28px 1fr 28px 1fr;
  padding: 14px;
}

.topical-hub-visual span {
  background: #ffffff;
  border-radius: 7px;
  display: grid;
  gap: 3px;
  min-height: 56px;
  padding: 10px 12px;
}

.topical-hub-visual b {
  color: var(--text);
  font-family: var(--display-font);
  font-size: 13px;
  font-weight: 800;
}

.topical-hub-visual em {
  color: var(--text3);
  font-size: 12px;
  font-style: normal;
}

.topical-hub-visual i {
  background: #94a3b8;
  display: block;
  height: 3px;
  position: relative;
}

.topical-hub-visual i::after {
  border-bottom: 5px solid transparent;
  border-left: 7px solid #94a3b8;
  border-top: 5px solid transparent;
  content: "";
  position: absolute;
  right: -2px;
  top: -3.5px;
}

.topic-related-panel {
  background: #eef4ff;
  border: 1px solid #c7d7fe;
  border-radius: 8px;
  margin-top: 16px;
  padding: 16px;
}

.topic-related-panel strong {
  color: var(--text);
  display: block;
  font-family: var(--display-font);
  font-size: 17px;
  margin-bottom: 6px;
}

.topic-related-panel .content-p {
  margin: 0;
}

@media (max-width: 780px) {
  .topic-article-visual,
  .topic-block,
  .topic-block.topic-sub {
    grid-template-columns: 1fr;
  }

  .topic-block.topic-feature,
  .keyword-guide-block,
  .topical-hub-heading,
  .topic-inline-visual,
  .topic-equation-strip,
  .topic-reverse-visual,
  .topic-mini-diagram,
  .topic-phase-diagram,
  .keyword-flow-visual,
  .keyword-formula-visual,
  .topical-hub-visual {
    grid-template-columns: 1fr;
  }

  .topic-inline-visual i,
  .topic-mini-diagram i,
  .keyword-flow-visual i,
  .keyword-formula-visual i,
  .topical-hub-visual i {
    height: 24px;
    justify-self: center;
    width: 3px;
  }

  .topic-inline-visual i::after,
  .topic-mini-diagram i::after,
  .keyword-flow-visual i::after,
  .keyword-formula-visual i::after,
  .topical-hub-visual i::after {
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 7px solid var(--primary);
    border-bottom: 0;
    left: -3.5px;
    right: auto;
    top: 20px;
  }

  .topic-equation-strip > strong,
  .topic-reverse-visual > strong {
    line-height: 1;
  }

  .topic-phase-diagram i {
    height: 24px;
    justify-self: center;
    width: 3px;
  }

  .topic-block.topic-sub {
    margin-left: 0;
  }

  .topic-icon {
    width: max-content;
  }

  .keyword-guide-icon {
    width: max-content;
  }

  .keyword-scale-visual span {
    grid-template-columns: 1fr;
  }
}

/* ===== STANDALONE TOOL PAGES ===== */
.tool-page-container {
  max-width: 1180px;
}

.tool-page-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(300px, 0.95fr) minmax(320px, 1.05fr);
  margin-top: 24px;
}

.mini-tool-calculator,
.tool-page-visual {
  padding: 18px;
}

.tool-page-label {
  color: var(--text4);
  font-family: var(--display-font);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.tool-page-input-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
}

.tool-page-input-grid label {
  display: grid;
  gap: 6px;
}

.tool-page-result {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 14px;
  padding: 14px;
}

.tool-result-main {
  color: var(--text);
  display: block;
  font-family: var(--mono);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.05;
  margin: 4px 0;
}

.tool-result-detail {
  color: var(--text3);
  margin: 0;
}

.tool-page-visual svg {
  background: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: block;
  margin-bottom: 12px;
  width: 100%;
}

.tool-page-visual text {
  fill: var(--text);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 800;
  text-anchor: middle;
}

.tool-svg-source {
  fill: #eef4ff;
  stroke: var(--primary);
  stroke-width: 3;
}

.tool-svg-core {
  fill: #1f2937;
  stroke: #111827;
  stroke-width: 3;
}

.tool-svg-output {
  fill: #ecfdf5;
  stroke: var(--accent-cyan);
  stroke-width: 3;
}

.tool-svg-wire {
  fill: none;
  stroke: var(--primary);
  stroke-linecap: round;
  stroke-width: 4;
}

.tool-svg-core + text,
.tool-page-visual svg text:nth-of-type(3),
.tool-page-visual svg text:nth-of-type(4) {
  fill: #ffffff;
}

.static-faq-card {
  display: grid;
  gap: 10px;
}

.static-faq-card details {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}

.static-faq-card summary {
  color: var(--text);
  cursor: pointer;
  font-family: var(--display-font);
  font-weight: 800;
}

.static-faq-card p {
  color: var(--text3);
  margin: 8px 0 0;
}

.generated-tool-directory {
  margin-top: 28px;
}

.generated-tool-directory .tool-card {
  min-height: 100%;
}

@media (max-width: 860px) {
  .tool-page-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== SITEWIDE PROFESSIONAL SPACING PASS ===== */
.premium-header-inner {
  max-width: 1440px;
}

.premium-nav {
  gap: 2px;
}

.premium-nav-link,
.premium-nav-menu > summary {
  font-size: 13px;
  padding: 9px 8px;
  white-space: nowrap;
}

.premium-nav-menu:nth-last-of-type(-n + 2) .premium-nav-panel {
  left: auto;
  right: 0;
}

.premium-nav-panel {
  min-width: 310px;
}

.premium-nav-panel a small {
  color: #64748b;
  line-height: 1.35;
}

.icon-circle {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
}

.brand-header.pro-hero:not(.tool-page-hero) {
  align-items: center;
  display: grid;
  gap: 18px 30px;
  grid-template-areas:
    "badge visual"
    "title visual"
    "content visual"
    "actions visual";
  grid-template-columns: minmax(0, 1.06fr) minmax(280px, 0.74fr);
  padding: clamp(24px, 3.2vw, 42px);
  text-align: left;
}

.brand-header.pro-hero:not(.tool-page-hero) .brand-badge {
  grid-area: badge;
  margin: 0;
  width: max-content;
}

.brand-header.pro-hero:not(.tool-page-hero) .hero-title {
  grid-area: title;
  line-height: 1.04;
  margin: 0;
  max-width: 760px;
}

.brand-header.pro-hero:not(.tool-page-hero) .hero-content {
  grid-area: content;
  margin: 0;
  max-width: 760px;
}

.brand-header.pro-hero:not(.tool-page-hero) .hero-actions {
  align-items: center;
  grid-area: actions;
  justify-content: flex-start;
  margin: 0;
}

.brand-header.pro-hero:not(.tool-page-hero) .hero-actions .btn {
  justify-content: center;
  min-width: 210px;
}

.brand-header.pro-hero:not(.tool-page-hero) .hero-visual {
  align-self: stretch;
  grid-area: visual;
  min-height: 320px;
}

.tool-page-hero {
  display: block;
  padding: clamp(22px, 3vw, 36px);
  text-align: left;
}

.tool-page-hero .brand-badge {
  margin: 0 0 14px;
  width: max-content;
}

.tool-page-hero .hero-title {
  line-height: 1.05;
  margin: 0 0 12px;
}

.tool-page-hero .hero-content {
  margin: 0;
  max-width: 860px;
}

.card,
.content-card,
.keyword-guides-card,
.topical-hub-card,
.legal-card,
.mini-tool-calculator,
.tool-page-visual,
.static-faq-card {
  overflow: hidden;
}

.content-card > :first-child,
.keyword-guides-card > :first-child,
.topical-hub-card > :first-child,
.legal-card > :first-child,
.mini-tool-calculator > :first-child,
.tool-page-visual > :first-child,
.static-faq-card > :first-child {
  margin-top: 0;
}

.content-card > :last-child,
.keyword-guides-card > :last-child,
.topical-hub-card > :last-child,
.legal-card > :last-child,
.mini-tool-calculator > :last-child,
.tool-page-visual > :last-child,
.static-faq-card > :last-child {
  margin-bottom: 0;
}

.section-divider {
  margin: clamp(28px, 4vw, 44px) 0 18px;
}

.section-divider .line {
  min-width: 70px;
}

.content-p,
.legal-card p,
.legal-card li,
.tool-result-detail,
.static-faq-card p {
  line-height: 1.72;
}

.faq-section .faq-card {
  border-color: rgba(29, 78, 216, 0.18);
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
}

.faq-quick-grid {
  margin-bottom: 6px;
}

.static-faq-card details {
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.static-faq-card details[open] {
  background: #ffffff;
  border-color: rgba(29, 78, 216, 0.28);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.07);
}

.static-faq-card summary {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

.static-faq-card summary::after {
  align-items: center;
  background: #eaf1ff;
  border: 1px solid rgba(29, 78, 216, 0.16);
  border-radius: 999px;
  color: var(--primary-dark);
  content: "+";
  display: inline-flex;
  flex: 0 0 24px;
  font-family: var(--mono);
  font-size: 15px;
  height: 24px;
  justify-content: center;
  line-height: 1;
  width: 24px;
}

.static-faq-card details[open] summary::after {
  content: "-";
}

.static-faq-card strong {
  color: #0f172a;
}

.topical-hub-card {
  gap: 14px;
  padding: clamp(16px, 2.2vw, 24px);
}

.topical-hub-intro {
  gap: 6px;
}

.topical-hub-intro p {
  margin: 0;
}

.topical-hub-groups {
  align-items: stretch;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.topical-hub-group {
  padding: 12px;
}

.topical-hub-heading {
  gap: 10px;
}

.topical-hub-heading h2 {
  line-height: 1.2;
}

.topical-link-grid {
  gap: 7px;
  grid-template-columns: 1fr;
}

.topical-link-grid a {
  min-height: 0;
  padding: 9px 10px;
}

.topical-hub-visual {
  margin-top: 2px;
}

.premium-footer-inner {
  align-items: start;
  gap: clamp(18px, 3vw, 34px);
  max-width: 1440px;
}

.semantic-footer-grid {
  grid-template-columns: minmax(240px, 1.15fr) repeat(5, minmax(145px, 1fr));
}

.premium-footer-links {
  gap: 8px;
}

.semantic-footer-grid .premium-footer-links a {
  line-height: 1.35;
}

.calculator-sequence {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.sequence-overview {
  margin-bottom: 18px;
}

.sequence-group {
  margin-top: 18px;
}

.sequence-heading {
  margin-bottom: 12px;
}

.sequence-tool-grid {
  align-items: stretch;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.sequence-card {
  min-height: 100%;
  padding: 14px;
}

.sequence-card .tool-card-header {
  align-items: flex-start;
}

.sequence-card .tool-card-title {
  font-size: 16px;
  line-height: 1.25;
}

.sequence-card .tool-card-subtitle {
  line-height: 1.5;
}

.site-map-list {
  columns: 2;
  column-gap: 28px;
  margin: 10px 0 20px;
  padding-left: 18px;
}

.site-map-list li {
  break-inside: avoid;
  margin-bottom: 8px;
}

@media (max-width: 1240px) {
  .premium-nav-link,
  .premium-nav-menu > summary {
    font-size: 12px;
    padding-inline: 6px;
  }

  .semantic-footer-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .semantic-footer-grid .premium-footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 1100px) {
  .topical-hub-groups {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .brand-header.pro-hero:not(.tool-page-hero) {
    grid-template-areas:
      "badge"
      "title"
      "content"
      "actions"
      "visual";
    grid-template-columns: 1fr;
  }

  .brand-header.pro-hero:not(.tool-page-hero) .hero-visual {
    min-height: 0;
  }

  .premium-nav-link,
  .premium-nav-menu > summary {
    font-size: 14px;
    padding: 10px;
    white-space: normal;
  }

  .premium-nav-menu:nth-last-of-type(-n + 2) .premium-nav-panel {
    left: 0;
    right: auto;
  }
}

@media (max-width: 640px) {
  .brand-header.pro-hero:not(.tool-page-hero),
  .tool-page-hero {
    padding: 18px;
  }

  .brand-header.pro-hero:not(.tool-page-hero) .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .brand-header.pro-hero:not(.tool-page-hero) .hero-actions .btn {
    min-width: 0;
    width: 100%;
  }

  .semantic-footer-grid {
    grid-template-columns: 1fr;
  }

  .site-map-list {
    columns: 1;
  }
}

/* ===== PREMIUM HEADER AND FOOTER VISUAL UPGRADE ===== */
.premium-header,
.site-header.premium-header {
  background:
    linear-gradient(135deg, rgba(10, 16, 31, 0.97) 0%, rgba(22, 33, 55, 0.98) 48%, rgba(18, 27, 43, 0.97) 100%);
  border-bottom: 1px solid rgba(214, 178, 92, 0.22);
  box-shadow: 0 18px 48px rgba(8, 14, 25, 0.22);
  color: #f8fafc;
  isolation: isolate;
  margin-bottom: 28px;
  overflow: visible;
  position: sticky;
}

.premium-header::before {
  background:
    linear-gradient(90deg, rgba(214, 178, 92, 0.72), rgba(56, 189, 248, 0.56), rgba(34, 197, 94, 0.42));
  bottom: -1px;
  content: "";
  height: 2px;
  left: 0;
  position: absolute;
  right: 0;
  z-index: -1;
}

.premium-header-inner {
  min-height: 82px;
  padding: 0 clamp(18px, 3vw, 34px);
}

.premium-brand {
  border-radius: 14px;
  gap: 14px;
  padding: 8px 10px 8px 0;
}

.premium-brand:focus-visible {
  outline: 2px solid rgba(214, 178, 92, 0.9);
  outline-offset: 4px;
}

.premium-brand-mark {
  background:
    linear-gradient(145deg, #f7d98a 0%, #b78328 42%, #0f172a 43%, #0b1220 100%);
  border: 1px solid rgba(247, 217, 138, 0.58);
  border-radius: 12px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.35),
    0 14px 28px rgba(0, 0, 0, 0.28),
    0 0 0 4px rgba(214, 178, 92, 0.08);
  color: #ffffff;
  flex-basis: 48px;
  height: 48px;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.45);
  width: 48px;
}

.premium-brand-name {
  color: #ffffff;
  font-size: clamp(18px, 1.65vw, 23px);
  font-weight: 800;
  text-shadow: 0 1px 18px rgba(255, 255, 255, 0.08);
}

.premium-brand-line {
  color: #d6b25c;
  letter-spacing: 0.08em;
}

.premium-nav {
  align-items: center;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  gap: 4px;
  padding: 5px;
}

.premium-nav-link,
.premium-nav-menu > summary {
  border-radius: 12px;
  color: #dbeafe;
  font-size: 13px;
  min-height: 40px;
  padding: 10px 12px;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.premium-nav-link:hover,
.premium-nav-link:focus-visible,
.premium-nav-menu > summary:hover,
.premium-nav-menu > summary:focus-visible,
.premium-nav-menu[open] > summary {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(214, 178, 92, 0.36);
  color: #ffffff;
  outline: none;
  transform: translateY(-1px);
}

.premium-nav-menu > summary::after {
  color: #d6b25c;
}

.premium-nav-panel {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(244, 248, 252, 0.98) 100%);
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 14px;
  box-shadow:
    0 24px 60px rgba(2, 6, 23, 0.22),
    0 0 0 1px rgba(255, 255, 255, 0.72) inset;
  gap: 4px;
  margin-top: 12px;
  padding: 10px;
}

.premium-nav-panel::before {
  background: linear-gradient(90deg, #d6b25c, #38bdf8, #22c55e);
  border-radius: 999px;
  content: "";
  display: block;
  height: 3px;
  margin: 0 2px 6px;
}

.premium-nav-panel a {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 11px 12px;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.premium-nav-panel a:hover,
.premium-nav-panel a:focus-visible {
  background: #eef6ff;
  border-color: #bfdbfe;
  color: #0f3f8f;
  transform: translateX(2px);
}

.premium-nav-panel span {
  color: #0f172a;
}

.premium-nav-panel small,
.premium-nav-panel a small {
  color: #5b6b82;
}

.premium-menu-button {
  background: linear-gradient(145deg, #f7d98a, #b78328);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.28);
  height: 44px;
  width: 44px;
}

.premium-menu-button span {
  background: #0b1220;
}

/* ===== PREMIUM MULTI-LANGUAGE SELECTOR ===== */
.premium-header-inner {
  position: relative;
}

.premium-language-shell {
  flex: 0 0 auto;
  margin-left: 0;
  order: 2;
  position: relative;
  z-index: 70;
}

.premium-nav {
  order: 1;
}

.premium-menu-button {
  order: 3;
}

.premium-language-toggle {
  align-items: center;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.055));
  border: 1px solid rgba(226, 232, 240, 0.34);
  border-radius: 14px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 12px 28px rgba(2, 6, 23, 0.2);
  color: #eaf2ff;
  cursor: pointer;
  display: inline-flex;
  font-size: 13px;
  font-weight: 750;
  gap: 9px;
  min-height: 42px;
  padding: 9px 12px;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease, transform 160ms ease;
  white-space: nowrap;
}

.premium-language-toggle:hover,
.premium-language-toggle:focus-visible,
.premium-language-shell.is-open .premium-language-toggle {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(247, 217, 138, 0.58);
  color: #ffffff;
  outline: none;
  transform: translateY(-1px);
}

.premium-language-icon {
  align-items: center;
  background: linear-gradient(145deg, #f7d98a, #b78328);
  border-radius: 10px;
  color: #08111f;
  display: inline-flex;
  font-size: 12px;
  font-weight: 900;
  height: 24px;
  justify-content: center;
  width: 30px;
}

.premium-language-current {
  max-width: 92px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.premium-language-menu {
  background:
    radial-gradient(circle at 18% 0%, rgba(56, 189, 248, 0.14), transparent 30%),
    linear-gradient(180deg, rgba(10, 16, 31, 0.98), rgba(13, 22, 39, 0.98));
  border: 1px solid rgba(226, 232, 240, 0.18);
  border-radius: 20px;
  box-shadow:
    0 30px 80px rgba(2, 6, 23, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  display: none;
  min-width: min(740px, calc(100vw - 28px));
  padding: 18px;
  position: absolute;
  right: 0;
  top: calc(100% + 14px);
}

.premium-language-shell.is-open .premium-language-menu {
  display: block;
}

.premium-language-title {
  align-items: center;
  color: #f7d98a;
  display: flex;
  font-size: 12px;
  font-weight: 850;
  justify-content: space-between;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.premium-language-title::after {
  background: linear-gradient(90deg, rgba(247, 217, 138, 0.8), rgba(56, 189, 248, 0));
  border-radius: 999px;
  content: "";
  flex: 1;
  height: 1px;
  margin-left: 14px;
}

.premium-language-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
}

.premium-language-option {
  background: rgba(8, 15, 29, 0.72);
  border: 1px solid rgba(203, 213, 225, 0.78);
  border-radius: 13px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  color: #cfe0f8;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  min-height: 38px;
  padding: 10px 13px;
  transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease, transform 140ms ease;
}

.premium-language-option:hover,
.premium-language-option:focus-visible {
  background: rgba(29, 78, 216, 0.24);
  border-color: rgba(147, 197, 253, 0.95);
  color: #ffffff;
  outline: none;
  transform: translateY(-1px);
}

.premium-language-option.is-active {
  background: #f8fafc;
  border-color: rgba(255, 255, 255, 0.92);
  box-shadow:
    0 10px 26px rgba(255, 255, 255, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  color: #64748b;
  font-weight: 850;
}

.premium-footer-language {
  background:
    radial-gradient(circle at 15% 0%, rgba(56, 189, 248, 0.14), transparent 28%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.035));
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  grid-column: 1 / -1;
  padding: 20px;
}

.premium-footer-language p {
  color: #cbd5e1;
  font-size: 14px;
  line-height: 1.6;
  margin: 0 0 16px;
}

.premium-footer-language-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
}

.premium-footer-language .premium-language-option {
  background: rgba(8, 15, 29, 0.52);
}

.premium-back-to-top {
  align-items: center;
  background:
    linear-gradient(145deg, #f7d98a, #b78328);
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 999px;
  bottom: 22px;
  box-shadow:
    0 18px 44px rgba(2, 6, 23, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
  color: #08111f;
  cursor: pointer;
  display: inline-flex;
  gap: 7px;
  min-height: 46px;
  opacity: 0;
  padding: 10px 15px;
  pointer-events: none;
  position: fixed;
  right: 22px;
  transform: translateY(14px);
  transition: opacity 160ms ease, transform 160ms ease, box-shadow 160ms ease;
  z-index: 120;
}

.premium-back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.premium-back-to-top:hover,
.premium-back-to-top:focus-visible {
  box-shadow:
    0 22px 52px rgba(2, 6, 23, 0.42),
    0 0 0 4px rgba(247, 217, 138, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.42);
  outline: none;
  transform: translateY(-2px);
}

.premium-back-to-top span {
  align-items: center;
  background: rgba(8, 17, 31, 0.12);
  border-radius: 999px;
  display: inline-flex;
  font-size: 18px;
  font-weight: 900;
  height: 24px;
  justify-content: center;
  line-height: 1;
  width: 24px;
}

.premium-back-to-top strong {
  font-size: 13px;
  letter-spacing: 0.02em;
}

.premium-google-translate-mount,
.goog-te-banner-frame,
.goog-te-gadget,
.goog-te-balloon-frame,
#goog-gt-tt {
  display: none !important;
}

body {
  top: 0 !important;
}

.premium-footer,
.site-footer.premium-footer {
  background:
    linear-gradient(135deg, #07111f 0%, #111827 44%, #162033 100%);
  border-top: 1px solid rgba(214, 178, 92, 0.28);
  box-shadow: 0 -28px 70px rgba(8, 14, 25, 0.2);
  color: #dbeafe;
  margin-top: 64px;
  overflow: hidden;
  position: relative;
}

.premium-footer::before {
  background: linear-gradient(90deg, #d6b25c, #38bdf8, #22c55e);
  content: "";
  height: 3px;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
}

.premium-footer-inner {
  gap: clamp(22px, 3.5vw, 44px);
  padding: clamp(38px, 5vw, 62px) clamp(18px, 3vw, 34px) 30px;
}

.premium-footer-brand {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.035));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  padding: 20px;
}

.premium-footer-logo {
  color: #ffffff;
  gap: 13px;
}

.premium-footer-brand p,
.premium-footer-note,
.premium-footer-bottom p {
  color: #cbd5e1;
}

.premium-footer-note {
  background: rgba(214, 178, 92, 0.1);
  border: 1px solid rgba(214, 178, 92, 0.24);
  border-radius: 12px;
  color: #f8e7b1;
  line-height: 1.55;
}

.footer-section-heading {
  color: #f7d98a;
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  position: relative;
}

.footer-section-heading::after {
  background: linear-gradient(90deg, rgba(214, 178, 92, 0.9), rgba(56, 189, 248, 0));
  border-radius: 999px;
  content: "";
  display: block;
  height: 2px;
  margin-top: 8px;
  width: 42px;
}

.premium-footer-links {
  gap: 7px;
}

.premium-footer-links a {
  align-items: center;
  border: 1px solid transparent;
  border-radius: 10px;
  color: #d8e4f6;
  display: flex;
  font-size: 14px;
  gap: 8px;
  min-height: 34px;
  padding: 7px 9px;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.premium-footer-links a::before {
  background: #38bdf8;
  border-radius: 999px;
  content: "";
  flex: 0 0 5px;
  height: 5px;
  opacity: 0.72;
  width: 5px;
}

.premium-footer-links a:hover,
.premium-footer-links a:focus-visible {
  background: rgba(255, 255, 255, 0.075);
  border-color: rgba(56, 189, 248, 0.2);
  color: #ffffff;
  outline: none;
  transform: translateX(2px);
}

.premium-footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  max-width: 1440px;
  padding: 18px clamp(18px, 3vw, 34px) 24px;
}

@media (max-width: 1240px) {
  .premium-nav-link,
  .premium-nav-menu > summary {
    padding-inline: 9px;
  }
}

@media (max-width: 980px) {
  .premium-header-inner {
    min-height: 72px;
  }

  .premium-nav {
    background:
      linear-gradient(180deg, rgba(10, 16, 31, 0.98), rgba(22, 33, 55, 0.98));
    border-color: rgba(214, 178, 92, 0.22);
    border-radius: 16px;
    box-shadow: 0 22px 58px rgba(2, 6, 23, 0.32);
    gap: 6px;
    padding: 10px;
  }

  .premium-nav-panel {
    background: rgba(255, 255, 255, 0.96);
  }

  .premium-nav-link,
  .premium-nav-menu > summary {
    color: #e5edfb;
    min-height: 42px;
  }
}

@media (max-width: 640px) {
  .premium-brand {
    gap: 10px;
  }

  .premium-brand-mark {
    flex-basis: 42px;
    height: 42px;
    width: 42px;
  }

  .premium-brand-name {
    font-size: 17px;
  }

  .premium-footer-brand {
    padding: 16px;
  }
}

@media (max-width: 980px) {
  .premium-language-shell {
    margin-left: auto;
  }

  .premium-language-menu {
    min-width: min(640px, calc(100vw - 28px));
    right: -58px;
  }
}

@media (max-width: 640px) {
  .premium-language-current {
    display: none;
  }

  .premium-language-toggle {
    border-radius: 12px;
    gap: 0;
    min-height: 40px;
    padding: 8px;
  }

  .premium-language-icon {
    height: 24px;
    width: 30px;
  }

  .premium-language-menu {
    border-radius: 16px;
    max-height: min(68vh, 520px);
    overflow: auto;
    padding: 14px;
    right: -54px;
  }

  .premium-language-grid {
    gap: 10px;
  }

  .premium-language-option {
    font-size: 14px;
    min-height: 36px;
    padding: 9px 11px;
  }

  .premium-footer-language {
    padding: 16px;
  }

  .premium-footer-language-grid {
    gap: 10px;
  }

  .premium-back-to-top {
    bottom: 16px;
    min-height: 42px;
    padding: 9px 12px;
    right: 16px;
  }

  .premium-back-to-top strong {
    display: none;
  }
}