/* ==========================================================================
   YouTube Description Extractor — Complete Design System & Engine UI
   Locked Tokens & Color Philosophy:
   70% White/Near-White | 20% Dark Gray & Black Text | 10% Red Accents
   ========================================================================== */

:root {
  /* Brand Red Scale (10% Accent) */
  --color-primary: #FF0000;
  --color-primary-hover: #CC0000;
  --color-primary-active: #990000;
  --color-primary-subtle: #FFF0F0;
  --color-primary-glow: rgba(255, 0, 0, 0.10);

  /* Background Scale (70% Canvas) */
  --color-bg-white: #FFFFFF;
  --color-bg-page: #FAFAFA;
  --color-bg-soft: #F7F7F7;
  --color-bg-muted: #F2F2F2;

  /* Typography Scale (20% Contrast) */
  --color-text-primary: #171717;
  --color-text-secondary: #666666;
  --color-text-muted: #999999;

  /* Border Scale */
  --color-border: #E5E5E5;
  --color-border-dark: #D4D4D4;
  --color-border-light: #EEEEEE;

  /* Footer Scale */
  --color-footer-bg: #111111;
  --color-footer-text: #FFFFFF;
  --color-footer-muted: #A3A3A3;
  --color-footer-link: #D4D4D4;

  /* State Scale */
  --color-success: #16A34A;
  --color-success-bg: #F0FDF4;
  --color-error: #DC2626;
  --color-error-bg: #FEF2F2;

  /* Border Radii */
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Spacing Scale (8pt System) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 80px;

  /* Typography */
  --font-family-base: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Transitions & Shadows */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-btn-primary: 0 2px 6px rgba(255, 0, 0, 0.2);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.03), 0 1px 3px rgba(0, 0, 0, 0.02);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: transparent;
  transition: all var(--transition-fast);
}

ul, ol {
  list-style: none;
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.875rem;
  background-color: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  padding: 2px 6px;
  border-radius: 4px;
}

.hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ==========================================================================
   Accessibility: Skip Link & Focus Outline
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  padding: 10px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
  box-shadow: var(--shadow-btn-primary);
}

.skip-link:focus {
  top: 16px;
  outline: 2px solid #FFFFFF;
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   Global Layout Containers
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--space-6); /* 32px desktop */
}

.text-container {
  max-width: 820px;
  margin-inline: auto;
}

/* ==========================================================================
   Global Header Shell
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg-white);
  border-bottom: 1px solid var(--color-border-light);
  height: 68px;
  display: flex;
  align-items: center;
}

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

/* Brand Logo */
.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo-desktop {
  display: block;
  height: 38px;
  width: auto;
  object-fit: contain;
}

.brand-mobile {
  display: none;
  align-items: center;
  gap: 10px;
}

.logo-mobile-icon {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.logo-mobile-text {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

/* Desktop Navigation */
.desktop-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: #333333;
  padding: 6px 0;
  position: relative;
}

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

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

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

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Reusable Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md); /* 10px */
  padding: 9px 20px;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: var(--shadow-btn-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #FFFFFF;
}

.btn-primary:active {
  background-color: var(--color-primary-active);
  transform: translateY(1px);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary-subtle);
  border-color: #FFCDD2;
  color: var(--color-primary);
}

.btn-secondary:active {
  background-color: #FFE5E5;
}

.btn-header-cta {
  display: inline-flex;
}

.btn-cta-large {
  padding: 12px 28px;
  font-size: 1rem;
}

/* Mobile Toggle Button */
.mobile-menu-toggle {
  display: none;
  padding: 8px;
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
}

.mobile-menu-toggle:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-primary);
}

/* ==========================================================================
   Mobile Drawer Navigation
   ========================================================================== */
.mobile-drawer {
  display: none;
  position: absolute;
  top: 68px;
  left: 0;
  width: 100%;
  background-color: var(--color-bg-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
}

.mobile-drawer.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-nav {
  padding: var(--space-5) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  padding: 12px 14px;
  min-height: 44px;
  border-radius: var(--radius-sm);
}

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

.mobile-drawer-cta {
  padding-top: var(--space-2);
}

.btn-mobile-cta {
  width: 100%;
  min-height: 44px;
}

/* ==========================================================================
   Hero & Extractor Section
   ========================================================================== */
.site-main {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-page);
}

.hero-section {
  padding: var(--space-8) 0 var(--space-8);
  text-align: center;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Primary H1 */
.hero-title {
  font-size: 3rem; /* 48px */
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: var(--space-4);
  max-width: 800px;
}

/* Supporting Copy */
.hero-subtitle {
  font-size: 1.125rem; /* 18px */
  color: var(--color-text-secondary);
  line-height: 1.55;
  max-width: 640px;
  margin-bottom: var(--space-7);
}

/* Central Extractor Card */
.extractor-card {
  width: 100%;
  max-width: 680px;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); /* 16px */
  padding: var(--space-6); /* 32px */
  box-shadow: var(--shadow-card);
  text-align: left;
  transition: border-color var(--transition-fast);
}

.extractor-card:hover {
  border-color: var(--color-border-dark);
}

/* Extractor Form */
.extractor-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 0.875rem; /* 14px */
  font-weight: 600;
  color: var(--color-text-primary);
}

.input-wrapper {
  position: relative;
  width: 100%;
}

.form-input {
  width: 100%;
  height: 52px;
  padding: 0 var(--space-4);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md); /* 10px */
  font-size: 1rem; /* 16px */
  color: var(--color-text-primary);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-glow);
}

/* Single Primary CTA Button */
.btn-extract {
  width: 100%;
  height: 50px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md); /* 10px */
}

.btn-extract:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Helper Text */
.form-helper-text {
  font-size: 0.875rem; /* 14px */
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: 2px;
}

/* Error Alert */
.form-error-alert {
  background-color: var(--color-error-bg);
  border: 1px solid #FECACA;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-error);
  font-size: 0.875rem;
  line-height: 1.4;
}

.error-svg {
  flex-shrink: 0;
}

/* Spinner */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Trust Indicators Row */
.hero-trust-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  margin-top: var(--space-5);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem; /* 14px */
  font-weight: 500;
  color: var(--color-text-secondary);
}

.trust-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid #BBF7D0;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ==========================================================================
   Extraction Results Section (Phase 4)
   ========================================================================== */
.results-section {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-top: var(--space-7);
  text-align: left;
}

.result-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); /* 16px */
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.result-section-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.result-section-label.primary-label {
  color: var(--color-primary);
}

/* Video Info Card (Secondary Context) */
.video-info-card {
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-bg-white);
}

.video-info-header {
  margin-bottom: var(--space-3);
}

.video-info-content {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-4);
  align-items: start;
}

.video-thumbnail-wrap {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #000000;
}

.result-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-meta-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.video-channel-name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.result-video-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.35;
}

.meta-action-bar {
  margin-top: var(--space-2);
}

.btn-copy {
  padding: 6px 14px;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
}

.btn-copy.is-copied {
  background-color: var(--color-success-bg);
  border-color: #BBF7D0;
  color: var(--color-success);
}

/* YouTube Description Card (Primary Emphasis) */
.description-result-card {
  padding: 0;
  border: 1px solid var(--color-border);
}

.description-card-header {
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-bg-soft);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.btn-copy-primary {
  padding: 7px 16px;
  font-size: 0.8125rem;
}

.btn-copy-primary.is-copied {
  background-color: var(--color-success);
  color: #FFFFFF;
}

.description-body {
  padding: var(--space-5);
  max-height: 480px;
  overflow-y: auto;
  background-color: var(--color-bg-white);
}

.result-description-text {
  font-family: var(--font-family-base);
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  outline: none;
}

.no-description-message {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  font-style: italic;
  padding: var(--space-4) 0;
}

/* Results Footer Actions: Extract Another */
.results-footer-actions {
  display: flex;
  justify-content: center;
  padding-top: var(--space-3);
}

.btn-extract-another {
  padding: 10px 24px;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Phase 5: SEO Content, Educational, & FAQ Sections
   ========================================================================== */
.content-section {
  padding: var(--space-8) 0;
}

.section-white {
  background-color: var(--color-bg-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-soft {
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-heading {
  font-size: 1.875rem; /* 30px */
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  line-height: 1.25;
}

.section-header-centered {
  text-align: center;
  margin-bottom: var(--space-7);
}

.section-subheading {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-inline: auto;
}

.content-prose {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.content-prose p {
  margin-bottom: var(--space-4);
}

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

/* Steps Grid (How It Works) */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.step-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  position: relative;
  display: flex;
  flex-direction: column;
}

.step-badge {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-3);
  font-family: var(--font-family-mono);
}

.step-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.step-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* Use Cases Grid */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.use-case-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
}

.use-case-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.use-case-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.use-case-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.notice-callout {
  margin-top: var(--space-7);
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Supported URLs List */
.url-types-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.url-type-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.url-type-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.url-type-example {
  word-break: break-all;
  color: var(--color-primary);
  background-color: var(--color-primary-subtle);
  border-color: #FFCDD2;
}

/* What Does the Tool Extract List */
.extract-details-list {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-left: 20px;
  list-style: disc;
}

.extract-details-list li {
  line-height: 1.6;
}

/* FAQ Accordion (Native Semantic details/summary) */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

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

.faq-summary {
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  list-style: none;
  user-select: none;
  min-height: 48px;
}

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

.faq-summary:hover {
  color: var(--color-primary);
}

.faq-summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.faq-icon {
  color: var(--color-primary);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition-fast);
  margin-left: var(--space-3);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-content {
  padding: 0 var(--space-5) var(--space-5);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.faq-content code {
  color: var(--color-primary);
}

/* Final CTA Section */
.final-cta-section {
  padding: var(--space-8) 0;
  text-align: center;
}

.cta-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-7) var(--space-6);
  box-shadow: var(--shadow-card);
}

.cta-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.cta-text {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
}

.cta-action {
  display: flex;
  justify-content: center;
}

/* ==========================================================================
   Global Dark Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: var(--space-8) 0 var(--space-6);
  border-top: 1px solid #222222;
  margin-top: auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 2fr;
  gap: var(--space-8);
  margin-bottom: var(--space-7);
}

.footer-brand {
  max-width: 340px;
}

.footer-logo-badge {
  display: inline-block;
  background-color: #FFFFFF;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
}

.footer-logo {
  height: 32px;
  width: auto;
  object-fit: contain;
}

.footer-description {
  font-size: 0.875rem;
  color: var(--color-footer-muted);
  line-height: 1.6;
}

.footer-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.footer-col-title {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-footer-text);
  margin-bottom: var(--space-4);
}

.footer-menu {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-menu a {
  font-size: 0.875rem;
  color: var(--color-footer-link);
  display: inline-block;
  padding: 2px 0;
}

.footer-menu a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: var(--space-5);
  border-top: 1px solid #222222;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.copyright-text {
  font-size: 0.8125rem;
  color: var(--color-footer-muted);
}

/* ==========================================================================
   Responsive Breakpoints (Phase 1 Locked)
   ========================================================================== */

/* Tablet (768px – 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .container {
    padding-inline: var(--space-5); /* 24px */
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .extractor-card,
  .results-section {
    max-width: 600px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .footer-top {
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-6);
  }
}

/* Mobile (≤ 767px) */
@media (max-width: 767px) {
  .container {
    padding-inline: var(--space-4); /* 16px-20px */
  }

  .site-header {
    height: 60px;
  }

  .logo-desktop {
    display: none;
  }

  .brand-mobile {
    display: flex;
  }

  .desktop-nav,
  .btn-header-cta {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .mobile-drawer {
    display: block;
    top: 60px;
  }

  /* Hero Mobile */
  .hero-section {
    padding: var(--space-6) 0 var(--space-6);
  }

  .hero-title {
    font-size: 2rem; /* 32px */
  }

  .hero-subtitle {
    font-size: 0.9375rem; /* 15px */
    margin-bottom: var(--space-5);
  }

  .extractor-card,
  .results-section {
    padding: var(--space-4);
  }

  .form-input {
    height: 48px;
    font-size: 1rem;
  }

  .form-helper-text {
    font-size: 0.8125rem;
  }

  .hero-trust-row {
    flex-direction: column;
    gap: var(--space-2);
    align-items: center;
  }

  /* Results Mobile */
  .video-info-content {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .video-thumbnail-wrap {
    max-width: 240px;
  }

  .description-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .btn-copy-primary {
    width: 100%;
  }

  .btn-extract-another {
    width: 100%;
  }

  /* Content Sections Mobile */
  .content-section {
    padding: var(--space-7) 0;
  }

  .section-heading {
    font-size: 1.5rem;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .use-cases-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .url-type-item {
    padding: var(--space-3) var(--space-4);
  }

  .cta-card {
    padding: var(--space-6) var(--space-4);
  }

  .cta-title {
    font-size: 1.375rem;
  }

  .btn-cta-large {
    width: 100%;
  }

  /* Footer Mobile */
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer-nav-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }

  .footer-menu a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
}