/* ==========================================================================
   ADRO BROWSER — Design System v2.0
   Premium dark theme · Indigo/purple accent · 2025/2026
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. DESIGN TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* Neutral palette */
  --c-bg-0: #050507;
  --c-bg-1: #0a0a10;
  --c-bg-2: #111118;
  --c-bg-3: #1a1a24;
  --c-bg-4: #22222f;
  --c-border: #1e1e2e;
  --c-border-hover: #2d2d42;

  /* Text palette */
  --c-text-1: #eff0f6;
  --c-text-2: #9698b0;
  --c-text-3: #64667e;

  /* Accent */
  --c-accent: #6366f1;
  --c-accent-hover: #818cf8;
  --c-accent-muted: rgba(99, 102, 241, 0.12);
  --c-accent-glow: rgba(99, 102, 241, 0.20);

  /* Gradients */
  --gradient-brand: linear-gradient(135deg, #6366f1, #a855f7);
  --gradient-brand-wide: linear-gradient(135deg, #6366f1, #a855f7, #ec4899);
  --gradient-text: linear-gradient(135deg, #fff 0%, #9698b0 100%);

  /* Status colors */
  --c-success: #34d399;
  --c-warning: #fbbf24;
  --c-error: #f87171;
  --c-info: #60a5fa;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', ui-monospace, monospace;

  --fs-display: clamp(2.75rem, 6vw, 4.5rem);
  --fs-h1: clamp(2rem, 4vw, 3rem);
  --fs-h2: clamp(1.5rem, 3vw, 2.25rem);
  --fs-h3: 1.25rem;
  --fs-body: 1rem;
  --fs-sm: 0.875rem;
  --fs-xs: 0.75rem;

  --lh-tight: 1.15;
  --lh-snug: 1.35;
  --lh-normal: 1.6;
  --lh-relaxed: 1.75;

  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  /* Spacing (4px base grid) */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-24: 96px;

  /* Radius */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px var(--c-accent-glow);
  --shadow-glow-lg: 0 0 80px var(--c-accent-glow);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 150ms;
  --dur-normal: 250ms;
  --dur-slow: 400ms;

  /* Z-index */
  --z-sticky: 80;
  --z-nav: 100;
  --z-overlay: 200;
  --z-modal: 300;

  /* Layout */
  --max-w: 1200px;
  --nav-h: 64px;
}

/* --------------------------------------------------------------------------
   2. RESET & BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--c-text-1);
  background: var(--c-bg-0);
  overflow-x: hidden;
  min-height: 100vh;
}

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

a:hover {
  color: var(--c-accent-hover);
}

img, svg {
  display: block;
  max-width: 100%;
}

::selection {
  background: rgba(99, 102, 241, 0.3);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--c-bg-1); }
::-webkit-scrollbar-thumb { background: var(--c-bg-4); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: var(--c-text-3); }

/* --------------------------------------------------------------------------
   3. TYPOGRAPHY
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--c-text-1);
  line-height: var(--lh-tight);
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p {
  color: var(--c-text-2);
}

.text-gradient {
  background: var(--gradient-brand-wide);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-subtle {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --------------------------------------------------------------------------
   4. LAYOUT
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.section {
  padding: var(--sp-24) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--sp-16);
}

.section-header h2 {
  font-size: var(--fs-h2);
  font-weight: var(--fw-extrabold);
  margin-bottom: var(--sp-3);
  letter-spacing: -0.03em;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--c-text-2);
  max-width: 560px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   5. NAVIGATION
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 var(--sp-6);
  background: rgba(5, 5, 7, 0.6);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: background var(--dur-normal) ease,
              border-color var(--dur-normal) ease;
}

.nav.scrolled {
  background: rgba(5, 5, 7, 0.88);
  border-bottom-color: var(--c-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
}

.logo {
  font-size: 1.35rem;
  font-weight: var(--fw-extrabold);
  letter-spacing: -0.03em;
}

.logo a {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  list-style: none;
}

.nav-links a {
  color: var(--c-text-2);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  text-decoration: none;
  position: relative;
  transition: color var(--dur-fast) ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: var(--r-full);
  transition: width var(--dur-normal) var(--ease-out);
}

.nav-links a:hover {
  color: var(--c-text-1);
}

.nav-links a:hover::after {
  width: 100%;
}

/* Nav CTA */
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  background: var(--gradient-brand);
  color: #fff;
  -webkit-text-fill-color: #fff;
  border-radius: var(--r-sm);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: transform var(--dur-fast) ease,
              box-shadow var(--dur-fast) ease;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
  color: #fff;
}

.nav-cta svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--c-text-1);
  cursor: pointer;
  padding: var(--sp-2);
  border-radius: var(--r-sm);
  transition: background var(--dur-fast) ease;
}

.mobile-menu-btn:hover {
  background: var(--c-bg-3);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

/* Mobile overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--dur-normal) ease;
  pointer-events: none;
}

.mobile-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile menu panel */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-modal);
  width: 300px;
  max-width: 85vw;
  background: var(--c-bg-1);
  border-left: 1px solid var(--c-border);
  padding: var(--sp-8) var(--sp-6);
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease-out);
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-8);
}

.mobile-menu-close {
  background: none;
  border: none;
  color: var(--c-text-2);
  cursor: pointer;
  padding: var(--sp-2);
  border-radius: var(--r-sm);
  transition: color var(--dur-fast) ease,
              background var(--dur-fast) ease;
}

.mobile-menu-close:hover {
  color: var(--c-text-1);
  background: var(--c-bg-3);
}

.mobile-menu-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.mobile-menu-links a {
  display: block;
  padding: var(--sp-3) var(--sp-4);
  color: var(--c-text-2);
  font-size: 1rem;
  font-weight: var(--fw-medium);
  text-decoration: none;
  border-radius: var(--r-sm);
  transition: background var(--dur-fast) ease,
              color var(--dur-fast) ease;
}

.mobile-menu-links a:hover {
  background: var(--c-bg-3);
  color: var(--c-text-1);
}

.mobile-menu-cta {
  margin-top: var(--sp-8);
}

.mobile-menu-cta .btn {
  width: 100%;
  justify-content: center;
}

/* --------------------------------------------------------------------------
   6. BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--r-md);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--dur-normal) var(--ease-out);
  position: relative;
}

.btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: 0 2px 12px var(--c-accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--c-accent-glow);
  color: #fff;
}

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

.btn-secondary {
  background: var(--c-bg-2);
  color: var(--c-text-1);
  border: 1px solid var(--c-border);
}

.btn-secondary:hover {
  background: var(--c-bg-3);
  border-color: var(--c-border-hover);
  transform: translateY(-1px);
  color: var(--c-text-1);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text-2);
  padding: var(--sp-2) var(--sp-3);
}

.btn-ghost:hover {
  background: var(--c-bg-3);
  color: var(--c-text-1);
}

.btn-lg {
  padding: var(--sp-4) var(--sp-8);
  font-size: 1.05rem;
  border-radius: var(--r-lg);
}

.btn-sm {
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-sm);
  border-radius: var(--r-sm);
}

/* --------------------------------------------------------------------------
   7. CARDS
   -------------------------------------------------------------------------- */

/* Model Cards */
.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--sp-4);
}

.model-card {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  text-decoration: none;
  color: var(--c-text-1);
  transition: all var(--dur-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.model-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--model-color, var(--gradient-brand));
  opacity: 0;
  transition: opacity var(--dur-normal) ease;
}

.model-card:hover {
  border-color: var(--c-border-hover);
  background: var(--c-bg-3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  color: var(--c-text-1);
}

.model-card:hover::before {
  opacity: 1;
}

.model-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.model-name {
  font-size: 1.05rem;
  font-weight: var(--fw-semibold);
  color: var(--c-text-1);
}

.model-shortcut {
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--c-text-3);
  background: var(--c-bg-4);
  padding: 2px var(--sp-2);
  border-radius: 6px;
  border: 1px solid var(--c-border);
}

.model-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-2);
}

.model-category {
  font-size: var(--fs-xs);
  color: var(--c-accent);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
}

.feature-card {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  transition: all var(--dur-normal) var(--ease-out);
}

.feature-card:hover {
  border-color: var(--c-border-hover);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--r-md);
  background: var(--c-accent-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--sp-4);
  color: var(--c-accent);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--sp-2);
}

.feature-card p {
  font-size: var(--fs-sm);
  color: var(--c-text-2);
  line-height: var(--lh-relaxed);
}

/* FAQ Cards */
.faq-item {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--sp-5);
  margin-bottom: var(--sp-3);
  transition: border-color var(--dur-normal) ease;
}

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

.faq-item h3 {
  font-size: 1rem;
  font-weight: var(--fw-semibold);
  margin-bottom: var(--sp-2);
}

.faq-item p {
  font-size: var(--fs-sm);
  color: var(--c-text-2);
  line-height: var(--lh-relaxed);
  margin-bottom: 0;
}

/* Contact Card */
.contact-card {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--sp-8);
  text-align: center;
  margin-top: var(--sp-6);
}

.contact-card p {
  margin-bottom: var(--sp-4);
}

/* Search Cards */
.search-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--sp-3);
  max-width: 860px;
  margin: 0 auto;
}

.search-card {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--sp-5);
  text-align: center;
  transition: all var(--dur-normal) var(--ease-out);
}

.search-card:hover {
  border-color: var(--c-border-hover);
  transform: translateY(-2px);
}

.search-name {
  font-size: 1rem;
  font-weight: var(--fw-semibold);
  color: var(--c-text-1);
  margin-bottom: var(--sp-1);
}

.search-desc {
  font-size: var(--fs-xs);
  color: var(--c-text-3);
}

/* --------------------------------------------------------------------------
   8. BADGES & KBD
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--sp-1) var(--sp-3);
  background: var(--c-accent-muted);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--r-full);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-accent);
}

kbd {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--c-text-2);
  background: var(--c-bg-3);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 2px var(--sp-2);
  line-height: 1.4;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--c-bg-3);
  border: 1px solid var(--c-border);
  padding: 1px var(--sp-2);
  border-radius: 4px;
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   9. SHORTCUTS SECTION
   -------------------------------------------------------------------------- */
.shortcuts-section {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: var(--sp-12) var(--sp-8);
  margin-top: var(--sp-16);
}

.shortcuts-section .section-header {
  margin-bottom: var(--sp-8);
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--sp-2);
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-sm);
  background: var(--c-bg-3);
  border: 1px solid transparent;
  transition: all var(--dur-fast) ease;
}

.shortcut-item:hover {
  border-color: var(--c-border);
  background: var(--c-bg-4);
}

.shortcut-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-1);
}

/* --------------------------------------------------------------------------
   10. HERO SECTION
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + var(--sp-24)) var(--sp-6) var(--sp-16);
  text-align: center;
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-backdrop .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  will-change: transform;
  animation: float 25s ease-in-out infinite;
}

.hero-backdrop .orb-1 {
  width: 500px;
  height: 500px;
  background: rgba(99, 102, 241, 0.12);
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
}

.hero-backdrop .orb-2 {
  width: 350px;
  height: 350px;
  background: rgba(168, 85, 247, 0.08);
  bottom: -50px;
  right: 15%;
  animation-delay: -12s;
}

.hero-backdrop .orb-3 {
  width: 250px;
  height: 250px;
  background: rgba(236, 72, 153, 0.06);
  bottom: 20%;
  left: 10%;
  animation-delay: -6s;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: var(--fs-display);
  font-weight: var(--fw-extrabold);
  line-height: var(--lh-tight);
  margin-bottom: var(--sp-6);
  letter-spacing: -0.03em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--c-text-2);
  max-width: 600px;
  margin: 0 auto var(--sp-8);
  line-height: var(--lh-relaxed);
}

.hero-buttons {
  display: flex;
  gap: var(--sp-3);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-meta {
  margin-top: var(--sp-8);
  display: flex;
  gap: var(--sp-8);
  justify-content: center;
  align-items: center;
  color: var(--c-text-3);
  font-size: var(--fs-sm);
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.hero-meta-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-text-3);
  opacity: 0.5;
}

/* --------------------------------------------------------------------------
   11. CTA SECTION
   -------------------------------------------------------------------------- */
.cta {
  position: relative;
  text-align: center;
  padding: var(--sp-24) var(--sp-6);
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, var(--c-accent-glow), transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta h2 {
  font-size: var(--fs-h1);
  font-weight: var(--fw-extrabold);
  margin-bottom: var(--sp-4);
  letter-spacing: -0.02em;
}

.cta p {
  font-size: 1.1rem;
  color: var(--c-text-2);
  margin-bottom: var(--sp-8);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   12. FOOTER
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--sp-8) var(--sp-6);
  border-top: 1px solid var(--c-border);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.footer-copy {
  color: var(--c-text-3);
  font-size: var(--fs-sm);
}

.footer-links {
  display: flex;
  gap: var(--sp-6);
  list-style: none;
}

.footer-links a {
  color: var(--c-text-3);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: color var(--dur-fast) ease;
}

.footer-links a:hover {
  color: var(--c-text-1);
}

/* --------------------------------------------------------------------------
   13. SUBPAGE LAYOUT
   -------------------------------------------------------------------------- */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-body {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + var(--sp-12)) var(--sp-6) var(--sp-16);
  width: 100%;
}

.page-body .back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-8);
  color: var(--c-text-3);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: color var(--dur-fast) ease;
}

.page-body .back-link:hover {
  color: var(--c-text-1);
}

.page-body .back-link svg {
  width: 16px;
  height: 16px;
}

.page-body h1 {
  font-size: var(--fs-h1);
  font-weight: var(--fw-extrabold);
  margin-bottom: var(--sp-2);
}

.page-body .page-subtitle {
  color: var(--c-text-3);
  font-size: var(--fs-sm);
  margin-bottom: var(--sp-12);
}

.page-body h2 {
  font-size: 1.3rem;
  font-weight: var(--fw-semibold);
  margin: var(--sp-10) 0 var(--sp-3);
}

.page-body h2:first-of-type {
  margin-top: 0;
}

.page-body p {
  color: var(--c-text-2);
  margin-bottom: var(--sp-4);
  line-height: var(--lh-relaxed);
}

.page-body ul {
  padding-left: var(--sp-6);
  margin-bottom: var(--sp-4);
}

.page-body li {
  color: var(--c-text-2);
  margin-bottom: var(--sp-2);
  line-height: var(--lh-relaxed);
}

.page-body li strong {
  color: var(--c-text-1);
}

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

/* --------------------------------------------------------------------------
   15. ANIMATIONS
   -------------------------------------------------------------------------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  33% {
    transform: translateX(-50%) translateY(-20px);
  }
  66% {
    transform: translateX(-50%) translateY(10px);
  }
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered children reveal */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.visible > *:nth-child(1)  { transition-delay: 0ms; }
.reveal-stagger.visible > *:nth-child(2)  { transition-delay: 60ms; }
.reveal-stagger.visible > *:nth-child(3)  { transition-delay: 120ms; }
.reveal-stagger.visible > *:nth-child(4)  { transition-delay: 180ms; }
.reveal-stagger.visible > *:nth-child(5)  { transition-delay: 240ms; }
.reveal-stagger.visible > *:nth-child(6)  { transition-delay: 300ms; }
.reveal-stagger.visible > *:nth-child(7)  { transition-delay: 360ms; }
.reveal-stagger.visible > *:nth-child(8)  { transition-delay: 420ms; }
.reveal-stagger.visible > *:nth-child(9)  { transition-delay: 480ms; }
.reveal-stagger.visible > *:nth-child(10) { transition-delay: 540ms; }

/* Hero entrance */
.hero-enter {
  animation: fadeInUp 0.8s var(--ease-out) both;
}

.hero-enter:nth-child(1) { animation-delay: 0ms; }
.hero-enter:nth-child(2) { animation-delay: 120ms; }
.hero-enter:nth-child(3) { animation-delay: 240ms; }
.hero-enter:nth-child(4) { animation-delay: 360ms; }
.hero-enter:nth-child(5) { animation-delay: 480ms; }

/* --------------------------------------------------------------------------
   16. RESPONSIVE
   -------------------------------------------------------------------------- */

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

/* Mobile */
@media (max-width: 768px) {
  :root {
    --nav-h: 56px;
  }

  .nav-links { display: none; }
  .nav-cta   { display: none; }
  .mobile-menu-btn { display: flex; }
  .mobile-overlay  { display: block; }
  .mobile-menu     { display: block; }

  .hero {
    padding: calc(var(--nav-h) + var(--sp-16)) var(--sp-4) var(--sp-12);
  }

  .hero h1 { font-size: clamp(2rem, 8vw, 3rem); }
  .hero p  { font-size: 1.05rem; }

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

  .hero-buttons .btn {
    width: 100%;
    max-width: 320px;
  }

  .hero-meta {
    flex-wrap: wrap;
    gap: var(--sp-4);
    justify-content: center;
  }

  .section {
    padding: var(--sp-16) 0;
  }

  .section-header {
    margin-bottom: var(--sp-8);
  }

  .section-header h2 {
    font-size: 1.75rem;
  }

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

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

  .shortcuts-section {
    padding: var(--sp-6);
    border-radius: var(--r-lg);
  }

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

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

  .cta {
    padding: var(--sp-16) var(--sp-4);
  }

  .cta h2 {
    font-size: 1.75rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .page-body {
    padding-top: calc(var(--nav-h) + var(--sp-8));
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .search-grid {
    grid-template-columns: 1fr;
  }

  .models-grid {
    gap: var(--sp-3);
  }

  .hero-backdrop .orb {
    filter: blur(80px);
  }

  .hero-backdrop .orb-1 {
    width: 300px;
    height: 300px;
  }
}

/* --------------------------------------------------------------------------
   17. ACCESSIBILITY
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal,
  .reveal-stagger > * {
    opacity: 1;
    transform: none;
  }

  .hero-enter {
    animation: none;
    opacity: 1;
  }

  .hero-backdrop .orb {
    animation: none;
  }
}

@media (prefers-contrast: high) {
  :root {
    --c-border: #3a3a56;
    --c-text-2: #b0b0cc;
    --c-text-3: #8888aa;
  }
}