/*
Theme Name: OhmLawCalculator Custom Theme
Theme URI: https://www.ohmlawcalculator.com/
Author: Muzammal Amin
Author URI: https://www.ohmlawcalculator.com/author
Description: Custom high-performance, glassmorphic WordPress theme for OhmLawCalculator.com. Includes interactive electrical calculators, Rank Math / Yoast SEO compatibility, and custom E-E-A-T schemas.
Version: 1.0.0
Text Domain: ohmlawcalculator
*/

/* --- css/tokens.css --- */
:root {
  /* Spacing System (8px base grid) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 20px;
  --space-2xl: 24px;
  --space-3xl: 32px;
  --space-4xl: 40px;
  --space-5xl: 48px;
  --space-6xl: 64px;
  --space-7xl: 80px;

  /* Typography Scale */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  
  --text-xs: 12px;
  --text-sm: clamp(13px, 12px + 0.25vw, 14px);
  --text-base: clamp(15px, 14px + 0.25vw, 16px);
  --text-md: clamp(16px, 15px + 0.25vw, 18px);
  --text-lg: clamp(18px, 17px + 0.25vw, 20px);
  --text-xl: clamp(20px, 18px + 0.5vw, 24px);
  --text-2xl: clamp(24px, 22px + 0.75vw, 30px);
  --text-3xl: clamp(28px, 24px + 1.25vw, 40px);
  --text-4xl: clamp(36px, 30px + 2vw, 52px);

  --mono-sm: 14px;
  --mono-base: 16px;
  --mono-lg: 20px;
  --mono-xl: 24px;
  --mono-2xl: 28px;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;

  /* Border Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transition Easing & Timing */
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);

  --transition-fast: 150ms var(--ease-default);
  --transition-normal: 250ms var(--ease-default);
  --transition-slow: 400ms var(--ease-smooth);

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.25);

  /* Semantic Colors (Theme agnostic defaults) */
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;

  /* Dark Mode Palette (Default) */
  --bg-primary: #080b14;
  --bg-secondary: #0f1420;
  --bg-tertiary: #161d2e;
  --bg-hover: #1c2540;
  --bg-result: rgba(255, 255, 255, 0.02);
  --bg-error: rgba(239, 68, 68, 0.05);
  --surface-glass: rgba(255, 255, 255, 0.04);
  
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);
  --border-focus: #3b82f6;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  /* Quantity Signature Colors */
  --accent-voltage: #facc15;      /* Amber/Yellow */
  --accent-current: #22d3ee;      /* Cyan */
  --accent-resistance: #34d399;   /* Emerald */
  --accent-power: #fb923c;        /* Orange */
  --accent-primary: #3b82f6;      /* Blue */
}

/* Light Mode Override */
.theme-light {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #e2e8f0;
  --bg-result: rgba(0, 0, 0, 0.01);
  --bg-error: rgba(239, 68, 68, 0.03);
  --surface-glass: rgba(0, 0, 0, 0.02);

  --border-subtle: rgba(0, 0, 0, 0.06);
  --border-default: rgba(0, 0, 0, 0.10);
  --border-strong: rgba(0, 0, 0, 0.18);
  --border-focus: #3b82f6;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --accent-voltage: #ca8a04;
  --accent-current: #0891b2;
  --accent-resistance: #059669;
  --accent-power: #ea580c;
  --accent-primary: #1d4ed8;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 15px rgba(29, 78, 216, 0.15);
}


/* --- css/components/header.css --- */
.site-header {
  position: sticky;
  top: 0;
  height: 64px;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header.scrolled {
  backdrop-filter: blur(12px);
  background-color: var(--surface-glass);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--text-primary);
}

.brand-logo {
  color: var(--accent-primary);
  font-weight: var(--weight-extrabold);
  font-size: var(--text-lg);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.brand-logo svg {
  width: 20px;
  height: 20px;
  stroke-width: 2px;
}

.brand-text {
  font-weight: var(--weight-bold);
  font-size: var(--text-base);
  letter-spacing: -0.02em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: color var(--transition-fast);
  padding: var(--space-xs) 0;
  position: relative;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-primary);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Hamburger menu button */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-xs);
}

/* Mobile Navigation Drawer */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 64px;
  left: -100%;
  width: 280px;
  height: calc(100vh - 64px);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  z-index: 90;
  padding: var(--space-xl);
  transition: left var(--transition-normal);
  flex-direction: column;
  gap: var(--space-xl);
}

.mobile-drawer.open {
  left: 0;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  list-style: none;
  gap: var(--space-lg);
}

.mobile-nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--text-md);
  font-weight: var(--weight-medium);
  display: block;
  padding: var(--space-xs) 0;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--text-primary);
}

.mobile-overlay {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  width: 100%;
  height: calc(100vh - 64px);
  background-color: rgba(0, 0, 0, 0.4);
  z-index: 80;
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .mobile-drawer {
    display: flex;
  }
}





/* --- css/components/footer.css --- */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-5xl) 0 var(--space-3xl) 0;
  margin-top: auto;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3xl);
  margin-bottom: var(--space-4xl);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--text-primary);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: var(--weight-bold);
}

.footer-logo svg {
  color: var(--accent-primary);
  width: 18px;
  height: 18px;
}

.footer-desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.copyright {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

/* Language Selector Component */
.lang-selector {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.lang-select {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  padding: var(--space-xs) var(--space-lg) var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 10px;
  padding-right: 24px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.lang-select:hover,
.lang-select:focus-visible {
  border-color: var(--border-strong);
  background-color: var(--bg-hover);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}


/* --- css/components/card.css --- */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  box-shadow: var(--shadow-sm);
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

@media (max-width: 640px) {
  .card {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
  }
}

/* Glassmorphism variation */
.card-glass {
  background: var(--surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
}

/* Interactive Card with hover effects */
.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-default);
}

.card-interactive:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Header within Card */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card-title svg {
  width: 20px;
  height: 20px;
  stroke-width: 2px;
}

/* Specific Card Layouts */
.related-card {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.related-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.related-card:hover .related-card-icon {
  background-color: var(--accent-primary);
  color: white;
}

.related-card-title {
  font-size: var(--text-md);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.related-card-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  flex-grow: 1;
}

.related-card-formula {
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* FAQ Accordion Styling */
.faq-item {
  margin-bottom: var(--space-sm);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--border-default);
  box-shadow: var(--shadow-md);
}

.faq-chevron {
  transition: transform var(--transition-fast) var(--ease-spring);
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}


/* --- css/components/button.css --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  text-decoration: none;
  line-height: 1;
}

.btn:active {
  transform: scale(0.98);
}

/* Primary Button */
.btn-primary {
  background-color: var(--accent-primary);
  color: white;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: #2563eb;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
}

.theme-light .btn-primary:hover,
.theme-light .btn-primary:focus-visible {
  background-color: #1e40af;
}

/* Outline Button */
.btn-outline {
  background-color: transparent;
  border-color: var(--border-default);
  color: var(--text-secondary);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background-color: var(--bg-hover);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

/* Icon Only Button */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-sm);
  background-color: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

.btn-icon:hover,
.btn-icon:focus-visible {
  background-color: var(--bg-hover);
  border-color: var(--border-default);
  color: var(--text-primary);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
  stroke-width: 1.5px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle-btn:hover,
.theme-toggle-btn:focus-visible {
  background-color: var(--bg-hover);
  border-color: var(--border-default);
  color: var(--text-primary);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
}

.theme-toggle-btn:hover svg {
  transform: rotate(15deg);
}

/* Action Group */
.btn-group {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

@media (max-width: 640px) {
  .btn-group {
    flex-direction: column;
    width: 100%;
  }
  .btn-group .btn {
    width: 100%;
  }
}

/* Scroll to Top Button */
.scroll-top-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 99999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity var(--transition-normal), transform var(--transition-normal), background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.scroll-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-default);
  color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.scroll-top-btn:active {
  transform: translateY(-2px);
}

.scroll-top-btn svg {
  width: 20px;
  height: 20px;
  stroke-width: 2.5px;
}



/* --- css/components/input.css --- */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-2xl);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  position: relative;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.input-group::before {
  content: '';
  position: absolute;
  top: var(--space-2xl);
  bottom: var(--space-2xl);
  left: 0;
  width: 5px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background-color: var(--border-default);
}

/* Quantity Specific Left Stripes */
.input-group.voltage::before { background-color: var(--accent-voltage); }
.input-group.current::before { background-color: var(--accent-current); }
.input-group.resistance::before { background-color: var(--accent-resistance); }
.input-group.power::before { background-color: var(--accent-power); }

/* Focused Input Group Glows */
.input-group:focus-within {
  border-color: var(--border-strong);
}

.input-group.voltage:focus-within { box-shadow: 0 0 18px rgba(250, 204, 21, 0.18); }
.input-group.current:focus-within { box-shadow: 0 0 18px rgba(34, 211, 238, 0.18); }
.input-group.resistance:focus-within { box-shadow: 0 0 18px rgba(52, 211, 153, 0.18); }
.input-group.power:focus-within { box-shadow: 0 0 18px rgba(251, 146, 60, 0.18); }

.input-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-left: var(--space-sm);
}

.input-label {
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--text-secondary);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.number-input {
  width: 100%;
  height: 56px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 0 44px 0 var(--space-lg);
  font-family: var(--font-mono);
  font-size: var(--mono-xl);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  caret-color: var(--accent-primary);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.number-input:hover {
  background-color: var(--bg-hover);
}

.number-input:focus-visible {
  border-color: var(--border-focus);
  background-color: var(--bg-tertiary);
  outline: none;
}

/* Hide Spin Buttons */
.number-input::-webkit-outer-spin-button,
.number-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.number-input {
  -moz-appearance: textfield;
}

/* Copy Button inside Input Wrapper */
.input-copy-btn {
  position: absolute;
  right: var(--space-sm);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  display: none; /* Only visible on results */
}

.input-copy-btn:hover,
.input-copy-btn:focus-visible {
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

.input-copy-btn svg {
  width: 16px;
  height: 16px;
}

/* Result States styling */
.input-group.is-result {
  background-color: var(--bg-result);
}

.input-group.is-result .number-input {
  font-weight: var(--weight-bold);
  background-color: transparent;
  border-color: var(--border-subtle);
  pointer-events: none;
}

.input-group.is-result .input-copy-btn {
  display: block;
}

.input-group.has-error {
  border-color: var(--color-danger);
}

.input-group.has-error .number-input {
  border-color: var(--color-danger);
}
@media(max-width: 640px) {
  .number-input {
    font-size: var(--mono-base);
    height: 44px;
  }
}


/* --- css/components/badge.css --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1;
}

.badge-result {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--accent-primary);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.badge-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.badge-voltage {
  background-color: rgba(250, 204, 21, 0.1);
  color: var(--accent-voltage);
  border: 1px solid rgba(250, 204, 21, 0.2);
}

.badge-current {
  background-color: rgba(34, 211, 238, 0.1);
  color: var(--accent-current);
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.badge-resistance {
  background-color: rgba(52, 211, 153, 0.1);
  color: var(--accent-resistance);
  border: 1px solid rgba(52, 211, 153, 0.2);
}

.badge-power {
  background-color: rgba(251, 146, 60, 0.1);
  color: var(--accent-power);
  border: 1px solid rgba(251, 146, 60, 0.2);
}

/* Animations */
.badge-animate {
  animation: badgeIn 300ms var(--ease-spring);
}

@keyframes badgeIn {
  0% { transform: scale(0.8); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}


/* --- css/components/pill.css --- */
/* Unit Selector Segmented Pill Buttons */
.unit-selector {
  display: inline-flex;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 2px;
  gap: 2px;
  position: relative;
  align-self: flex-start;
  margin-left: var(--space-sm);
}

.unit-pill {
  background: none;
  border: none;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  cursor: pointer;
  z-index: 2;
  transition: color var(--transition-fast);
}

.unit-pill:hover {
  color: var(--text-primary);
}

.unit-pill.active {
  color: var(--text-inverse);
  font-weight: var(--weight-semibold);
  background-color: var(--accent-primary);
}

/* Specific Pill Accent colors when active */
.input-group.voltage .unit-pill.active { background-color: var(--accent-voltage); color: var(--text-inverse); }
.input-group.current .unit-pill.active { background-color: var(--accent-current); color: var(--text-inverse); }
.input-group.resistance .unit-pill.active { background-color: var(--accent-resistance); color: var(--text-inverse); }
.input-group.power .unit-pill.active { background-color: var(--accent-power); color: var(--text-inverse); }

/* Preset Pills Bar */
.preset-bar {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  padding: var(--space-xs) var(--space-sm);
  margin-bottom: var(--space-md);
  scrollbar-width: none; /* Hide scrollbar for Firefox */
  -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
}

.preset-bar::-webkit-scrollbar {
  display: none; /* Hide scrollbar for Chrome/Safari */
}

.preset-pill {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  padding: var(--space-xs) var(--space-lg);
  border-radius: var(--radius-full);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.preset-pill:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-default);
  color: var(--text-primary);
}

.preset-pill.active {
  background-color: rgba(59, 130, 246, 0.15);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}


/* --- css/components/alert.css --- */
.alert {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid transparent;
  font-size: var(--text-sm);
  line-height: 1.5;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.alert-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.alert-icon svg {
  width: 20px;
  height: 20px;
}

.alert-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.alert-title {
  font-weight: var(--weight-bold);
}

/* Alert Variations */
.alert-warning {
  background-color: rgba(245, 158, 11, 0.05);
  border-left-color: var(--color-warning);
  color: var(--text-primary);
}

.alert-warning .alert-title {
  color: var(--color-warning);
}

.alert-warning .alert-icon {
  color: var(--color-warning);
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.05);
  border-left-color: var(--color-danger);
  color: var(--text-primary);
}

.alert-danger .alert-title {
  color: var(--color-danger);
}

.alert-danger .alert-icon {
  color: var(--color-danger);
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.05);
  border-left-color: var(--color-info);
  color: var(--text-primary);
}

.alert-info .alert-title {
  color: var(--color-info);
}

.alert-info .alert-icon {
  color: var(--color-info);
}

/* Animations */
.alert-animate {
  animation: alertIn 300ms var(--ease-spring);
}

@keyframes alertIn {
  0% { transform: translateY(-10px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

/* Cookie Consent Banner Styling */
.cookie-banner {
  position: fixed;
  bottom: var(--space-lg);
  left: var(--space-lg);
  right: var(--space-lg);
  max-width: 500px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-lg) !important;
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-primary) !important;
  animation: slideUp 400ms var(--ease-spring);
}

.theme-light .cookie-banner {
  background: var(--bg-secondary) !important;
}

@keyframes slideUp {
  0% { transform: translateY(100px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

@media (max-width: 640px) {
  .cookie-banner {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
  }
}


/* --- css/components/steps.css --- */
.steps-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.step-card {
  padding: var(--space-md) var(--space-lg);
  border-left: 3px solid var(--border-default);
  margin-bottom: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  animation: stepIn 300ms var(--ease-spring) both;
}

@keyframes stepIn {
  0% { transform: translateX(-10px); opacity: 0; }
  100% { transform: translateX(0); opacity: 1; }
}

.step-card.voltage { border-left-color: var(--accent-voltage); }
.step-card.current { border-left-color: var(--accent-current); }
.step-card.resistance { border-left-color: var(--accent-resistance); }
.step-card.power { border-left-color: var(--accent-power); }

.step-formula {
  font-family: var(--font-mono);
  font-size: var(--mono-sm);
  color: var(--text-secondary);
}

.step-sub {
  font-family: var(--font-mono);
  font-size: var(--mono-sm);
  color: var(--text-primary);
}

/* Variables styling inside step equations */
.step-sub .var-v { color: var(--accent-voltage); font-weight: var(--weight-semibold); }
.step-sub .var-i { color: var(--accent-current); font-weight: var(--weight-semibold); }
.step-sub .var-r { color: var(--accent-resistance); font-weight: var(--weight-semibold); }
.step-sub .var-p { color: var(--accent-power); font-weight: var(--weight-semibold); }

.step-result {
  font-family: var(--font-mono);
  font-size: var(--mono-base);
  font-weight: var(--weight-bold);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.step-result svg {
  width: 16px;
  height: 16px;
  color: var(--color-success);
}

/* Dynamic details drawer */
.step-details-toggle {
  background: none;
  border: none;
  color: var(--accent-primary);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) 0;
  margin-top: var(--space-xs);
  align-self: flex-start;
}

.step-details-toggle svg {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.step-details-toggle.open svg {
  transform: rotate(180deg);
}

.step-details-content {
  display: none;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  border-top: 1px dashed var(--border-subtle);
  margin-top: var(--space-xs);
}

.step-details-content.open {
  display: block;
}


/* --- css/components/section.css --- */
.section {
  padding: var(--space-5xl) 0;
}

@media (max-width: 640px) {
  .section {
    padding: var(--space-3xl) 0;
  }
}

.section-header {
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.section-title svg {
  width: 24px;
  height: 24px;
  color: var(--accent-primary);
  stroke-width: 1.5px;
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

/* Specific Section Grid Layout splits */
.calculator-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-3xl);
  align-items: start;
}

@media (max-width: 1024px) {
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

.calculator-left {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  min-width: 0;
  width: 100%;
}

.calculator-right {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  position: sticky;
  top: 80px;
  min-width: 0;
  width: 100%;
}

@media (max-width: 1024px) {
  .calculator-right {
    position: static;
  }
}


/* --- css/components/wheel.css --- */
.wheel-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: var(--space-md);
}

.formula-wheel-svg {
  width: 100%;
  max-width: 380px;
  height: auto;
  overflow: visible;
}

/* Sectors (Path components) */
.wheel-sector {
  fill: var(--bg-tertiary);
  stroke: var(--bg-primary);
  stroke-width: 2px;
  cursor: pointer;
  transition: fill var(--transition-fast), transform var(--transition-fast), filter var(--transition-fast);
  transform-origin: 160px 160px; /* Center of SVG viewBox="0 0 320 320" */
}

.wheel-sector:hover,
.wheel-sector:focus-visible {
  outline: none;
  transform: scale(1.03);
  filter: brightness(1.1);
  stroke: var(--text-muted);
}

.theme-light .wheel-sector:hover,
.theme-light .wheel-sector:focus-visible {
  filter: brightness(0.95);
}

/* Color Coding Sectors by Quantity */
.wheel-sector.voltage-sector { fill: rgba(250, 204, 21, 0.05); }
.wheel-sector.current-sector { fill: rgba(34, 211, 238, 0.05); }
.wheel-sector.resistance-sector { fill: rgba(52, 211, 153, 0.05); }
.wheel-sector.power-sector { fill: rgba(251, 146, 60, 0.05); }

.wheel-sector.voltage-sector:hover { fill: rgba(250, 204, 21, 0.15); }
.wheel-sector.current-sector:hover { fill: rgba(34, 211, 238, 0.15); }
.wheel-sector.resistance-sector:hover { fill: rgba(52, 211, 153, 0.15); }
.wheel-sector.power-sector:hover { fill: rgba(251, 146, 60, 0.15); }

/* Highlight Active States */
.wheel-sector.active {
  stroke-width: 3px;
  transform: scale(1.04);
}

.wheel-sector.voltage-sector.active { fill: var(--accent-voltage); stroke: var(--accent-voltage); filter: drop-shadow(0 0 8px rgba(250, 204, 21, 0.4)); }
.wheel-sector.current-sector.active { fill: var(--accent-current); stroke: var(--accent-current); filter: drop-shadow(0 0 8px rgba(34, 211, 238, 0.4)); }
.wheel-sector.resistance-sector.active { fill: var(--accent-resistance); stroke: var(--accent-resistance); filter: drop-shadow(0 0 8px rgba(52, 211, 153, 0.4)); }
.wheel-sector.power-sector.active { fill: var(--accent-power); stroke: var(--accent-power); filter: drop-shadow(0 0 8px rgba(251, 146, 60, 0.4)); }

/* text adjustments */
.wheel-label {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: var(--weight-bold);
  fill: var(--text-secondary);
  pointer-events: none;
}

.wheel-label.active {
  fill: var(--text-inverse);
}

.wheel-center-text {
  font-family: var(--font-ui);
  font-weight: var(--weight-extrabold);
  font-size: 16px;
  fill: var(--text-primary);
  pointer-events: none;
}

.wheel-center-sub {
  font-family: var(--font-ui);
  font-size: 8px;
  fill: var(--text-muted);
  pointer-events: none;
}

.wheel-center-bg {
  fill: var(--bg-secondary);
  stroke: var(--border-subtle);
  stroke-width: 2px;
}

.wheel-quadrant-line {
  stroke: var(--border-subtle);
  stroke-width: 1.5px;
  pointer-events: none;
}

/* Focus styles for keyboard navigability */
.wheel-anchor:focus-visible .wheel-sector {
  outline: none;
  transform: scale(1.05);
  stroke: var(--accent-primary);
  stroke-width: 3px;
}


/* --- css/components/graph.css --- */
.graph-container {
  width: 100%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.graph-svg {
  width: 100%;
  height: auto;
  max-height: 320px;
  overflow: visible;
}

/* Grid & Axes */
.graph-grid-line {
  stroke: var(--border-subtle);
  stroke-width: 1px;
}

.graph-axis-line {
  stroke: var(--text-muted);
  stroke-width: 2px;
}

.graph-axis-label {
  font-family: var(--font-ui);
  font-size: 11px;
  fill: var(--text-secondary);
  font-weight: var(--weight-medium);
}

.graph-tick-text {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--text-muted);
}

/* Plotted Lines */
.graph-slope-line {
  stroke: var(--accent-resistance);
  stroke-width: 3px;
  stroke-linecap: round;
  transition: stroke-dasharray var(--transition-normal);
}

.graph-guideline {
  stroke: var(--text-muted);
  stroke-width: 1px;
  stroke-dasharray: 4 4;
}

/* Draggable Point Handle */
.graph-drag-point {
  fill: var(--text-primary);
  stroke: var(--accent-primary);
  stroke-width: 3px;
  cursor: grab;
  transition: r var(--transition-fast), fill var(--transition-fast), stroke-width var(--transition-fast);
}

.graph-drag-point:hover,
.graph-drag-point:focus-visible {
  r: 10px;
  fill: var(--accent-primary);
  stroke: var(--text-primary);
  stroke-width: 2px;
  outline: none;
}

.graph-drag-point:active {
  cursor: grabbing;
  r: 11px;
  stroke-width: 3px;
}

.graph-tooltip-bg {
  fill: var(--bg-tertiary);
  stroke: var(--border-default);
  stroke-width: 1px;
  rx: var(--radius-sm);
  ry: var(--radius-sm);
}

.graph-tooltip-text {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--text-primary);
}
@media (max-width: 640px) {
  .graph-container {
    padding: var(--space-lg);
  }
  .graph-svg {
    max-height: 200px;
  }
}


/* --- css/components/circuit.css --- */
.circuit-container {
  width: 100%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.circuit-svg {
  width: 100%;
  height: auto;
  max-height: 240px;
  overflow: visible;
}

/* Wires & Paths */
.circuit-wire {
  stroke: var(--border-default);
  stroke-width: 4px;
  fill: none;
  stroke-linejoin: round;
  stroke-linecap: round;
}

/* Electron Dots flow styles */
.electron-dot {
  fill: var(--accent-current);
  filter: drop-shadow(0 0 3px var(--accent-current));
  offset-path: path("M 60 60 L 340 60 L 340 260 L 60 260 Z"); /* Wire loop path matching SVG coordinates */
  animation: flow var(--flow-speed, 0s) linear infinite;
  animation-play-state: paused;
}

.electron-dot.active {
  animation-play-state: running;
}

@keyframes flow {
  0% { offset-distance: 0%; }
  100% { offset-distance: 100%; }
}

/* Component Symbols */
.circuit-component {
  stroke: var(--text-primary);
  stroke-width: 3px;
  fill: var(--bg-secondary);
  stroke-linejoin: round;
}

.circuit-component-bg {
  fill: var(--bg-secondary);
}

.circuit-label {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: var(--weight-bold);
  fill: var(--text-secondary);
}

.circuit-value {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: var(--weight-bold);
  fill: var(--text-primary);
}

/* Resistor Thermal Overload Glow */
.circuit-resistor {
  stroke: var(--accent-resistance);
  transition: stroke var(--transition-normal), filter var(--transition-normal);
}

.circuit-resistor.is-overloaded {
  stroke: var(--color-danger);
  filter: drop-shadow(0 0 6px var(--color-danger));
  animation: overloadShake 150ms linear infinite;
}

@keyframes overloadShake {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(-0.5px, 0.5px); }
  50% { transform: translate(0.5px, -0.5px); }
  75% { transform: translate(-0.5px, -0.5px); }
}

/* Heat Waves radiating from Resistor */
.heat-wave {
  stroke: var(--color-danger);
  stroke-width: 1.5px;
  fill: none;
  stroke-linecap: round;
  opacity: 0;
  transform-origin: 340px 160px; /* Center of the load resistor */
  transition: opacity var(--transition-normal);
}

.circuit-resistor.is-overloaded + .heat-wave {
  opacity: 0.8;
  animation: heatPulse 1.2s ease-out infinite;
}

@keyframes heatPulse {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { opacity: 0.4; }
  100% { transform: scale(1.3); opacity: 0; }
}

/* Battery positive/negative color accents */
.battery-plus { fill: var(--color-danger); }
.battery-minus { fill: var(--accent-primary); }

@media (max-width: 640px) {
  .circuit-container {
    padding: var(--space-lg);
  }
  .circuit-svg {
    max-height: 180px;
  }
}

/* Reduced Motion Override */
@media (prefers-reduced-motion: reduce) {
  .electron-dot {
    animation: none !important;
    display: none !important;
  }
  .circuit-resistor.is-overloaded {
    animation: none !important;
  }
  .circuit-resistor.is-overloaded + .heat-wave {
    animation: none !important;
    opacity: 0.25 !important;
  }
}


/* --- css/components/toc.css --- */
.toc-sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding-left: var(--space-sm);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.toc-title {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toc-item {
  position: relative;
}

.toc-link {
  display: block;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.3;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  padding: 2px 0 2px var(--space-sm);
}

.toc-link:hover,
.toc-link:focus-visible {
  color: var(--text-primary);
}

.toc-link.active {
  color: var(--accent-primary);
  font-weight: var(--weight-semibold);
  padding-left: var(--space-md);
}

.toc-link.active::before {
  content: '';
  position: absolute;
  left: -1px;
  top: 2px;
  bottom: 2px;
  width: 2px;
  background-color: var(--accent-primary);
  border-radius: var(--radius-full);
}
@media (max-width: 1024px) {
  .toc-sidebar {
    display: none; /* Hide sidebar on tablet/mobile content lists */
  }
}


/* --- css/components/article.css --- */
.article-container {
  grid-column: span 8;
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

@media (max-width: 1024px) {
  .article-container {
    grid-column: span 8;
  }
}

@media (max-width: 640px) {
  .article-container {
    grid-column: span 4;
  }
}

.article-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.article-title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-extrabold);
  color: var(--text-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.article-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.article-content h2 {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  margin-top: var(--space-4xl);
  margin-bottom: var(--space-sm);
  scroll-margin-top: 80px; /* Offset for sticky header */
}

.article-content h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-xs);
  scroll-margin-top: 80px;
}

.article-content p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.7;
}

.article-content ul, 
.article-content ol {
  padding-left: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  color: var(--text-secondary);
}

.article-content li strong {
  color: var(--text-primary);
}

.article-content p code,
.article-content li code {
  font-family: var(--font-mono);
  font-size: var(--mono-sm);
  background-color: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  color: var(--accent-primary);
}

/* Callout cards in educational articles */
.article-callout {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--accent-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-lg) var(--space-xl);
  margin: var(--space-md) 0;
}

.article-callout-title {
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.article-callout-content {
  font-size: var(--text-sm) !important;
  color: var(--text-secondary);
  line-height: 1.5 !important;
}

.article-callout-content p {
  font-size: var(--text-sm) !important;
}

/* Breadcrumb Navigation */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
}

.breadcrumb-item a {
  text-decoration: none;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--text-primary);
}

.breadcrumb-separator {
  display: flex;
  align-items: center;
  color: var(--text-muted);
}

.breadcrumb-separator svg {
  width: 12px;
  height: 12px;
}


/* --- css/components/divider.css --- */
.divider-svg {
  width: 100%;
  height: auto;
  max-height: 240px;
  overflow: visible;
}

/* Specific divider wiring rules */
.divider-wire {
  stroke: var(--border-default);
  stroke-width: 3px;
  fill: none;
  stroke-linejoin: round;
}

.divider-resistor {
  stroke: var(--accent-resistance);
  stroke-width: 2.5px;
  fill: var(--bg-secondary);
}

.divider-node {
  fill: var(--accent-primary);
}

.divider-text-value {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--weight-bold);
  fill: var(--text-primary);
}

.divider-text-label {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: var(--weight-semibold);
  fill: var(--text-secondary);
}


/* --- css/components/color-code.css --- */
.band-tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.resistor-preview-card {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-3xl);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-xl);
}

.resistor-svg {
  width: 100%;
  max-width: 380px;
  height: auto;
  overflow: visible;
}

.resistor-body {
  fill: #e8d8b8; /* Classic beige resistor color */
  stroke: #c8b898;
  stroke-width: 2px;
  transition: fill var(--transition-normal);
}

.theme-light .resistor-body {
  fill: #f5ebd5;
  stroke: #dcd0b5;
}

.resistor-lead {
  stroke: #94a3b8;
  stroke-width: 4px;
  stroke-linecap: round;
}

/* Color Bands on Resistor */
.resistor-band {
  stroke-width: 0;
  transition: fill var(--transition-normal);
}

/* Color Palette Selector Grid */
.color-selectors-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.color-row {
  display: grid;
  grid-template-columns: 1.5fr 8.5fr;
  gap: var(--space-md);
  align-items: center;
}

.color-row-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  color: var(--text-secondary);
}

.color-palette {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

/* Individual Color Swatches */
.color-swatch {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-subtle);
  cursor: pointer;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.color-swatch:hover,
.color-swatch:focus-visible {
  transform: scale(1.15);
  border-color: var(--text-primary);
  outline: none;
}

.color-swatch.active {
  transform: scale(1.1);
  border-color: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
}

.color-swatch.active::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  text-shadow: 0 1px 2px rgba(0,0,0,0.8);
}

/* Swatch Color Variables mapping */
.swatch-black { background-color: #000000; }
.swatch-brown { background-color: #8b4513; }
.swatch-red { background-color: #ff0000; }
.swatch-orange { background-color: #ff8c00; }
.swatch-yellow { background-color: #ffd700; }
.swatch-green { background-color: #008000; }
.swatch-blue { background-color: #0000ff; }
.swatch-violet { background-color: #ee82ee; }
.swatch-gray { background-color: #808080; }
.swatch-white { background-color: #ffffff; }
.swatch-gold { background-color: #ffd700; background-image: linear-gradient(135deg, #ffd700, #b8860b); }
.swatch-silver { background-color: #c0c0c0; background-image: linear-gradient(135deg, #e0e0e0, #808080); }

/* Text shadow adjustments for light checkmarks */
.swatch-yellow.active::after,
.swatch-white.active::after,
.swatch-gold.active::after,
.swatch-silver.active::after {
  color: #000000;
  text-shadow: none;
}
@media (max-width: 640px) {
  .color-row {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }
}


/* --- Global Main Styles --- */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
}

body {
  font-family: var(--font-ui);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Accessibility Focus Ring (Key Navigation) */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Screen Reader Only Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Skip Link */
.skip-link {
  position: fixed;
  top: -100px;
  left: var(--space-md);
  background-color: var(--accent-primary);
  color: white;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: var(--weight-semibold);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-sm);
}

/* Layout Containers & Layout Grid */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-2xl);
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-lg);
  }
}

/* Grid System */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-2xl);
}

.grid-gap-lg {
  gap: var(--space-3xl);
}

/* Grid Spans */
.col-span-1 { grid-column: span 1; }
.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }
.col-span-6 { grid-column: span 6; }
.col-span-7 { grid-column: span 7; }
.col-span-8 { grid-column: span 8; }
.col-span-9 { grid-column: span 9; }
.col-span-10 { grid-column: span 10; }
.col-span-11 { grid-column: span 11; }
.col-span-12 { grid-column: span 12; }

@media (max-width: 1024px) {
  .grid {
    grid-template-columns: repeat(8, 1fr);
    gap: var(--space-xl);
  }
  
  .col-span-md-1 { grid-column: span 1; }
  .col-span-md-2 { grid-column: span 2; }
  .col-span-md-3 { grid-column: span 3; }
  .col-span-md-4 { grid-column: span 4; }
  .col-span-md-5 { grid-column: span 5; }
  .col-span-md-6 { grid-column: span 6; }
  .col-span-md-7 { grid-column: span 7; }
  .col-span-md-8 { grid-column: span 8; }
  .col-span-md-12 { grid-column: span 8; }
}

@media (max-width: 640px) {
  .grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
  }
  
  .col-span-sm-1 { grid-column: span 1; }
  .col-span-sm-2 { grid-column: span 2; }
  .col-span-sm-3 { grid-column: span 3; }
  .col-span-sm-4 { grid-column: span 4; }
  .col-span-sm-12 { grid-column: span 4; }
}

/* Layout Shell structure */
main {
  flex: 1 0 auto;
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-6xl);
}

@media (max-width: 640px) {
  main {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-4xl);
  }
}

/* Mesh Background Overlay */
.mesh-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -100;
  opacity: 0.7;
  pointer-events: none;
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(at 10% 20%, rgba(59, 130, 246, 0.05) 0px, transparent 50%),
    radial-gradient(at 90% 10%, rgba(139, 92, 246, 0.04) 0px, transparent 50%),
    radial-gradient(at 50% 80%, rgba(34, 211, 238, 0.03) 0px, transparent 50%);
}

.theme-light .mesh-bg {
  opacity: 0.4;
  background-image: 
    radial-gradient(at 10% 20%, rgba(59, 130, 246, 0.03) 0px, transparent 50%),
    radial-gradient(at 90% 10%, rgba(139, 92, 246, 0.02) 0px, transparent 50%),
    radial-gradient(at 50% 80%, rgba(34, 211, 238, 0.02) 0px, transparent 50%);
}

/* Utility alignments */
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-sm {
  gap: var(--space-sm);
}
.gap-md {
  gap: var(--space-md);
}
.gap-lg {
  gap: var(--space-lg);
}

/* Text styles */
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.text-quantity-v { color: var(--accent-voltage); }
.text-quantity-i { color: var(--accent-current); }
.text-quantity-r { color: var(--accent-resistance); }
.text-quantity-p { color: var(--accent-power); }

/* Animation configuration overrides */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- Author Page & Global SVG Sizing Constraints --- */
.social-pill svg,
.expertise-item svg,
.link-card-icon svg,
.author-card svg {
  max-width: 24px !important;
  max-height: 24px !important;
  width: 20px !important;
  height: 20px !important;
  flex-shrink: 0 !important;
}

.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  text-decoration: none;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.expertise-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.25rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  text-decoration: none;
}

.link-card-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-primary);
}

/* Ensure Uniform Container Max Width Across All Pages */
.container,
main.container,
#main-content {
  max-width: 1200px !important;
  margin-left: auto !important;
  margin-right: auto !important;
  padding-left: var(--space-xl) !important;
  padding-right: var(--space-xl) !important;
  box-sizing: border-box !important;
}