/* ==========================================================================
   Amptowattformula.com — Modern Electrical Calculators & Converters CSS System
   Full Dark / Light Theme, Responsive Design, 100% Core Web Vitals Optimized
   ========================================================================== */

:root {
  /* Dark Theme (Default) */
  --bg-primary: #0a0f1d;
  --bg-secondary: #11192e;
  --bg-card: #17223b;
  --bg-card-hover: #1e2c4d;
  --bg-input: #0c1424;
  --bg-glass: rgba(17, 25, 46, 0.85);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-focus: #06b6d4;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Electrical Domain Accent Colors */
  --accent-cyan: #06b6d4;      /* Volts / Core Ohm */
  --accent-blue: #3b82f6;      /* Current / Amps */
  --accent-amber: #f59e0b;     /* Watts / Solar / High Voltage */
  --accent-emerald: #10b981;   /* Efficiency / Safe / Grounding */
  --accent-purple: #8b5cf6;    /* Inductance / 3-Phase / Motor */
  --accent-rose: #f43f5e;      /* Warning / Overload / Resistance */

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.25);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', Consolas, Monaco, monospace;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #f1f5f9;
  --bg-card-hover: #e2e8f0;
  --bg-input: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.9);

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-medium: rgba(0, 0, 0, 0.16);
  --border-focus: #0284c7;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 15px rgba(2, 132, 199, 0.2);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #38bdf8;
  text-decoration: underline;
}

img, svg {
  vertical-align: middle;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

.main-content {
  flex: 1;
  padding-bottom: 60px;
}

/* Sticky Header & Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
  text-decoration: none !important;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-amber));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0b1120;
  font-weight: 900;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.4);
}

.brand-title span {
  color: var(--accent-amber);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Search Trigger Button */
.search-trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-trigger:hover {
  border-color: var(--accent-cyan);
  color: var(--text-main);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.15);
}

.kbd-shortcut {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-dim);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-amber);
  transform: rotate(15deg);
}

/* Mobile Burger Menu Button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 5px;
}

/* Breadcrumbs Navigation */
.breadcrumb-container {
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(0, 0, 0, 0.1);
  font-size: 0.88rem;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  color: var(--text-muted);
}

.breadcrumb-list li+li::before {
  content: "›";
  margin-right: 8px;
  color: var(--text-dim);
}

.breadcrumb-list a {
  color: var(--text-muted);
}

.breadcrumb-list a:hover {
  color: var(--accent-cyan);
}

.breadcrumb-list .current {
  color: var(--text-main);
  font-weight: 600;
}

/* Hero Section */
.hero-section {
  padding: 60px 0 40px;
  text-align: center;
  position: relative;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
  border: 1px solid transparent;
}

.badge-cyan {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border-color: rgba(6, 182, 212, 0.3);
}

.badge-amber {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.badge-emerald {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.3);
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff 0%, #38bdf8 50%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero-title {
  background: linear-gradient(135deg, #0f172a 0%, #0284c7 60%, #b45309 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 30px;
}

/* Quick Search Hero Bar */
.hero-search-wrapper {
  max-width: 680px;
  margin: 0 auto 30px;
  position: relative;
}

.hero-search-input {
  width: 100%;
  padding: 18px 24px 18px 52px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  color: var(--text-main);
  font-size: 1.05rem;
  box-shadow: var(--shadow-md);
  outline: none;
  transition: all var(--transition-fast);
}

.hero-search-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

.hero-search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

/* Category Filter Pills */
.filter-pills-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 40px;
}

.pill-button {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pill-button:hover,
.pill-button.active {
  background: var(--accent-cyan);
  color: #0b1120;
  border-color: var(--accent-cyan);
  font-weight: 700;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.3);
  text-decoration: none;
}

/* Interactive Calculator Card Layout */
.calculator-container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  margin-bottom: 40px;
}

@media (max-width: 960px) {
  .calculator-container {
    grid-template-columns: 1fr;
    padding: 24px;
  }
}

.calculator-inputs {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.calc-section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.input-help {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: normal;
}

.input-field-wrapper {
  display: flex;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.input-field-wrapper:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.2);
}

.calc-input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 12px 16px;
  color: var(--text-main);
  font-size: 1.1rem;
  font-family: var(--font-mono);
  outline: none;
}

.unit-select {
  background: var(--bg-card);
  border: none;
  border-left: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 0 14px;
  font-size: 0.9rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
}

/* Preset Buttons */
.presets-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.preset-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-dim);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-chip:hover {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

/* Calculator Output Panel */
.calculator-results {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.result-main-card {
  text-align: center;
  padding: 20px;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.result-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.result-value-display {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1.1;
  margin-bottom: 4px;
}

.result-unit-tag {
  font-size: 1.1rem;
  color: var(--accent-amber);
  margin-left: 6px;
}

.secondary-results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.secondary-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 12px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.secondary-item .sec-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.secondary-item .sec-val {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
}

.action-buttons-row {
  display: flex;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none !important;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #0b1120;
}

.btn-primary:hover {
  background: #38bdf8;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}

.btn-secondary {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-muted);
}

/* Formula Reference Box */
.formula-box {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-sm);
}

.formula-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.formula-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-weight: 700;
}

.formula-math {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: #38bdf8;
  padding: 10px 0;
  overflow-x: auto;
}

.formula-variables {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-muted);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 8px;
}

/* Dynamic Step-by-Step Derivation Accordion */
.derivation-accordion {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 30px;
  overflow: hidden;
}

.derivation-summary {
  padding: 16px 20px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  background: var(--bg-card);
}

.derivation-summary::-webkit-details-marker {
  display: none;
}

.derivation-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.derivation-step {
  padding: 8px 12px;
  margin-bottom: 8px;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-amber);
}

/* NEC / Safety Warning Callout */
.nec-callout {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-left: 4px solid var(--accent-amber);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 30px;
  display: flex;
  gap: 16px;
}

.nec-icon {
  color: var(--accent-amber);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.nec-content h4 {
  color: var(--accent-amber);
  font-size: 1rem;
  margin-bottom: 6px;
}

.nec-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Data Lookup Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.data-table th {
  background: var(--bg-card);
  color: var(--text-main);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-medium);
  font-family: var(--font-sans);
}

.data-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-main);
}

.data-table .font-mono {
  font-family: var(--font-mono);
}

/* Tools Card Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 22px;
  margin-bottom: 50px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  text-decoration: none !important;
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-lg), 0 0 15px rgba(6, 182, 212, 0.2);
}

.tool-card-category {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-cyan);
  margin-bottom: 8px;
  font-weight: 700;
}

.tool-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  line-height: 1.3;
}

.tool-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex: 1;
}

.tool-card-formula {
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #38bdf8;
  margin-bottom: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tool-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 12px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* Category Hub Cards */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 50px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  text-decoration: none !important;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.category-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-amber);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.cat-card-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.cat-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.cat-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  flex: 1;
  margin-bottom: 16px;
}

.cat-card-count {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-amber);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Search Modal */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 80px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.search-modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.search-modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 640px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(-20px);
  transition: transform var(--transition-fast);
}

.search-modal-backdrop.open .search-modal-card {
  transform: translateY(0);
}

.modal-search-header {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  gap: 12px;
}

.modal-search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.15rem;
  outline: none;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.2rem;
  cursor: pointer;
}

.modal-results-list {
  max-height: 420px;
  overflow-y: auto;
  list-style: none;
  padding: 8px 0;
}

.modal-result-item a {
  display: flex;
  flex-direction: column;
  padding: 12px 20px;
  color: var(--text-main);
  text-decoration: none !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  transition: background-color var(--transition-fast);
}

.modal-result-item a:hover,
.modal-result-item.selected a {
  background: rgba(6, 182, 212, 0.1);
}

.modal-result-title {
  font-weight: 600;
  font-size: 1rem;
}

.modal-result-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Toast Notifications */
.toast-notice {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--accent-cyan);
  color: #0b1120;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  opacity: 0;
  transform: translateY(15px);
  transition: all var(--transition-fast);
  pointer-events: none;
}

.toast-notice.show {
  opacity: 1;
  transform: translateY(0);
}

/* Legal & Static Content Layout */
.static-page-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin: 30px auto;
  max-width: 900px;
  box-shadow: var(--shadow-md);
}

.static-page-card h1 {
  font-size: 2.2rem;
  margin-bottom: 20px;
  color: var(--text-main);
}

.static-page-card h2 {
  font-size: 1.5rem;
  margin: 30px 0 12px;
  color: var(--text-main);
}

.static-page-card h3 {
  font-size: 1.2rem;
  margin: 20px 0 8px;
  color: var(--text-main);
}

.static-page-card p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
  line-height: 1.7;
}

.static-page-card ul, .static-page-card ol {
  color: var(--text-muted);
  padding-left: 24px;
  margin-bottom: 20px;
}

.static-page-card li {
  margin-bottom: 8px;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 640px;
  margin-top: 24px;
}

.contact-textarea {
  width: 100%;
  padding: 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 1rem;
  min-height: 140px;
  outline: none;
  resize: vertical;
}

.contact-textarea:focus {
  border-color: var(--border-focus);
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

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

@media (max-width: 520px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-main);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
}

.footer-disclaimer-note {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.5;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding: 20px;
    gap: 16px;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }
}

/* Print Media Query */
@media print {
  body {
    background: #fff !important;
    color: #000 !important;
  }

  .site-header, .site-footer, .search-modal-backdrop, .action-buttons-row, .theme-toggle-btn {
    display: none !important;
  }

  .calculator-container {
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
}



/* ==========================================================================
   PRO HEADER & MOBILE DRAWER OVERHAUL (100% Responsive & High-Tech Clean)
   ========================================================================== */

/* Hide mobile drawer on desktop ALWAYS */
@media (min-width: 993px) {
  .mobile-drawer,
  #mobileDrawer,
  .drawer-backdrop,
  #drawerBackdrop {
    display: none !important;
    visibility: hidden !important;
  }
}

/* Master Sticky Header */
.site-header {
  position: sticky !important;
  top: 0 !important;
  left: 0 !important;
  width: 100% !important;
  z-index: 9999 !important;
  background: rgba(15, 23, 42, 0.92) !important;
  backdrop-filter: blur(16px) !important;
  -webkit-backdrop-filter: blur(16px) !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.25) !important;
  transition: background 0.3s ease, border-color 0.3s ease !important;
}

[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.94) !important;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.06) !important;
}

.site-header .navbar {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  height: 70px !important;
  max-width: 1240px !important;
  margin: 0 auto !important;
  padding: 0 24px !important;
  gap: 20px !important;
}

/* Brand Logo */
.site-header .brand-logo {
  display: inline-flex !important;
  align-items: center !important;
  gap: 12px !important;
  text-decoration: none !important;
  cursor: pointer;
}

.site-header .brand-icon {
  width: 38px !important;
  height: 38px !important;
  border-radius: 10px !important;
  background: linear-gradient(135deg, #06b6d4, #f59e0b) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: 1.2rem !important;
  color: #0b1120 !important;
  font-weight: 900 !important;
  box-shadow: 0 0 14px rgba(6, 182, 212, 0.45) !important;
  flex-shrink: 0 !important;
}

.site-header .brand-title {
  font-family: 'Inter', system-ui, -apple-system, sans-serif !important;
  font-size: 1.3rem !important;
  font-weight: 800 !important;
  letter-spacing: -0.025em !important;
  color: #f8fafc !important;
  line-height: 1 !important;
  display: flex !important;
  align-items: center !important;
  gap: 2px !important;
}

[data-theme="light"] .site-header .brand-title {
  color: #0f172a !important;
}

.site-header .brand-title span {
  color: #f59e0b !important;
}

/* Navigation Links */
.site-header .nav-links {
  display: flex !important;
  align-items: center !important;
  gap: 4px !important;
  list-style: none !important;
  margin: 0 !important;
  padding: 0 !important;
}

.site-header .nav-links li {
  list-style: none !important;
  margin: 0 !important;
  padding: 0 !important;
}

.site-header .nav-links a {
  display: inline-block !important;
  padding: 8px 14px !important;
  border-radius: 8px !important;
  font-family: 'Inter', system-ui, sans-serif !important;
  font-size: 0.92rem !important;
  font-weight: 600 !important;
  color: #94a3b8 !important;
  text-decoration: none !important;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

[data-theme="light"] .site-header .nav-links a {
  color: #475569 !important;
}

.site-header .nav-links a:hover {
  color: #06b6d4 !important;
  background: rgba(6, 182, 212, 0.1) !important;
}

.site-header .nav-links a.active {
  color: #06b6d4 !important;
  background: rgba(6, 182, 212, 0.15) !important;
}

/* Header Actions */
.site-header .header-actions {
  display: flex !important;
  align-items: center !important;
  gap: 12px !important;
}

/* Search Trigger Pill Button */
.search-trigger-btn {
  display: inline-flex !important;
  align-items: center !important;
  gap: 10px !important;
  background: rgba(255, 255, 255, 0.06) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: #94a3b8 !important;
  padding: 8px 16px !important;
  border-radius: 9999px !important;
  font-size: 0.86rem !important;
  font-family: 'Inter', system-ui, sans-serif !important;
  font-weight: 500 !important;
  cursor: pointer !important;
  transition: all 0.2s ease !important;
  white-space: nowrap !important;
}

[data-theme="light"] .search-trigger-btn {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
  color: #475569 !important;
}

.search-trigger-btn:hover {
  border-color: #06b6d4 !important;
  color: #f8fafc !important;
  background: rgba(6, 182, 212, 0.12) !important;
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.25) !important;
}

[data-theme="light"] .search-trigger-btn:hover {
  color: #0f172a !important;
  border-color: #0284c7 !important;
  background: #e2e8f0 !important;
}

.search-trigger-btn svg {
  color: #06b6d4 !important;
  flex-shrink: 0 !important;
}

.kbd-shortcut {
  background: rgba(0, 0, 0, 0.4) !important;
  border: 1px solid rgba(255, 255, 255, 0.16) !important;
  border-radius: 4px !important;
  padding: 2px 7px !important;
  font-size: 0.72rem !important;
  font-family: 'Fira Code', monospace !important;
  color: #38bdf8 !important;
}

[data-theme="light"] .kbd-shortcut {
  background: #e2e8f0 !important;
  border-color: #cbd5e1 !important;
  color: #0284c7 !important;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px !important;
  height: 40px !important;
  border-radius: 50% !important;
  background: rgba(255, 255, 255, 0.06) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: #f8fafc !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  cursor: pointer !important;
  font-size: 1.15rem !important;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1) !important;
  padding: 0 !important;
}

[data-theme="light"] .theme-toggle-btn {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
  color: #0f172a !important;
}

.theme-toggle-btn:hover {
  border-color: #f59e0b !important;
  transform: rotate(20deg) scale(1.08) !important;
  box-shadow: 0 0 14px rgba(245, 158, 11, 0.35) !important;
}

/* Mobile Hamburger Button */
.mobile-menu-btn {
  display: none !important;
  width: 40px !important;
  height: 40px !important;
  border-radius: 10px !important;
  background: rgba(255, 255, 255, 0.06) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: #f8fafc !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: 1.35rem !important;
  cursor: pointer !important;
  padding: 0 !important;
  transition: all 0.2s ease !important;
}

[data-theme="light"] .mobile-menu-btn {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
  color: #0f172a !important;
}

/* Mobile Drawer (Only for screens <= 992px) */
@media (max-width: 992px) {
  .site-header .nav-links {
    display: none !important;
  }
  .mobile-menu-btn {
    display: inline-flex !important;
  }
  .search-trigger-btn span,
  .search-trigger-btn kbd {
    display: none !important;
  }
  .search-trigger-btn {
    padding: 8px 12px !important;
  }

  .mobile-drawer {
    position: fixed !important;
    top: 0 !important;
    left: -320px !important;
    width: 290px !important;
    max-width: 85vw !important;
    height: 100vh !important;
    background: #0f172a !important;
    z-index: 100001 !important;
    box-shadow: 10px 0 35px rgba(0, 0, 0, 0.6) !important;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    display: flex !important;
    flex-direction: column !important;
    overflow-y: auto !important;
    margin: 0 !important;
  }

  [data-theme="light"] .mobile-drawer {
    background: #ffffff !important;
    box-shadow: 10px 0 35px rgba(0, 0, 0, 0.15) !important;
  }

  .mobile-drawer.active {
    left: 0 !important;
  }

  .drawer-header {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    padding: 20px !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
  }

  [data-theme="light"] .drawer-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
  }

  .drawer-close-btn {
    background: rgba(255, 255, 255, 0.08) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    color: #f8fafc !important;
    width: 34px !important;
    height: 34px !important;
    border-radius: 8px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 1.3rem !important;
    cursor: pointer !important;
    line-height: 1 !important;
  }

  [data-theme="light"] .drawer-close-btn {
    background: #f1f5f9 !important;
    border-color: #cbd5e1 !important;
    color: #0f172a !important;
  }

  .drawer-body {
    padding: 16px 0 !important;
    flex: 1 !important;
  }

  .drawer-links {
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .drawer-links li {
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .drawer-links a {
    display: flex !important;
    align-items: center !important;
    padding: 13px 24px !important;
    color: #94a3b8 !important;
    font-size: 0.95rem !important;
    font-weight: 500 !important;
    text-decoration: none !important;
    border-left: 3px solid transparent !important;
    transition: all 0.2s ease !important;
  }

  [data-theme="light"] .drawer-links a {
    color: #475569 !important;
  }

  .drawer-links a:hover,
  .drawer-links a.active {
    color: #06b6d4 !important;
    background: rgba(6, 182, 212, 0.08) !important;
    border-left-color: #06b6d4 !important;
  }

  .drawer-backdrop {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    background: rgba(0, 0, 0, 0.65) !important;
    backdrop-filter: blur(4px) !important;
    z-index: 100000 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transition: all 0.3s ease !important;
  }

  .drawer-backdrop.active {
    opacity: 1 !important;
    visibility: visible !important;
  }
}