/* ============================================
   ANDROID ROOTING GUIDE — Design System
   ============================================ */

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

/* === DESIGN TOKENS === */
:root {
  /* Background */
  --bg-primary: #0a0e17;
  --bg-secondary: #0f1520;
  --bg-card: #111827;
  --bg-card-hover: #1a2332;
  --bg-glass: rgba(17, 24, 39, 0.75);
  --bg-code: #0d1117;

  /* Accent Colors */
  --accent-green: #00ff9d;
  --accent-green-dim: rgba(0, 255, 157, 0.15);
  --accent-green-glow: rgba(0, 255, 157, 0.3);
  --accent-cyan: #00d4ff;
  --accent-cyan-dim: rgba(0, 212, 255, 0.15);
  --accent-orange: #ff6b35;
  --accent-orange-dim: rgba(255, 107, 53, 0.15);
  --accent-red: #ff3355;
  --accent-red-dim: rgba(255, 51, 85, 0.15);
  --accent-purple: #a855f7;
  --accent-purple-dim: rgba(168, 85, 247, 0.15);

  /* Text */
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-code: #00ff9d;

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-glow: rgba(0, 255, 157, 0.2);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow-green: 0 0 20px rgba(0, 255, 157, 0.15);
  --shadow-glow-cyan: 0 0 20px rgba(0, 212, 255, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Z-index layers */
  --z-nav: 100;
  --z-modal: 200;
  --z-toast: 300;
}

/* === TYPOGRAPHY === */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code, pre, .mono {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }

p { margin-bottom: var(--space-md); }
a { color: var(--accent-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* === BACKGROUND GRID EFFECT === */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(0, 255, 157, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 157, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, rgba(0, 255, 157, 0.04) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(0, 212, 255, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* === LAYOUT === */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

section {
  padding: var(--space-3xl) 0;
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

section:not(:first-of-type) {
  border-top: 1px solid var(--border-subtle);
}

/* === NAVIGATION === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-base);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-logo .logo-icon {
  font-size: 1.5rem;
}

.nav-logo .logo-accent {
  color: var(--accent-green);
}

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

.nav-links a {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-green);
  background: var(--accent-green-dim);
}

.nav-mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: var(--space-sm);
  cursor: pointer;
  font-size: 1.3rem;
}

/* === GLASSMORPHISM CARD === */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
}

.glass-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow-green);
}

/* === TERMINAL CODE BLOCK === */
.terminal {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  position: relative;
  font-size: 0.88rem;
  line-height: 1.8;
  margin: var(--space-md) 0;
}

.terminal code {
  color: var(--text-code);
  white-space: pre;
}

.terminal .prompt {
  color: var(--accent-cyan);
  user-select: none;
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  margin: calc(-1 * var(--space-md)) calc(-1 * var(--space-lg)) var(--space-md);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot:nth-child(1) { background: #ff5f57; }
.terminal-dot:nth-child(2) { background: #febc2e; }
.terminal-dot:nth-child(3) { background: #28c840; }

.copy-btn {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  padding: 4px 10px;
  font-size: 0.75rem;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--accent-green-dim);
  color: var(--accent-green);
}

.copy-btn.copied {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  font-family: 'Inter', sans-serif;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-green);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: #33ffb3;
  box-shadow: 0 0 24px rgba(0, 255, 157, 0.3);
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: var(--accent-green);
  border: 1px solid var(--accent-green);
}

.btn-secondary:hover {
  background: var(--accent-green-dim);
  text-decoration: none;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
  text-decoration: none;
}

/* === WARNING/INFO BLOCKS === */
.warning {
  color: var(--accent-orange);
  font-weight: 600;
}

.danger {
  color: var(--accent-red);
  font-weight: 600;
}

.info-block {
  background: var(--accent-cyan-dim);
  border-left: 3px solid var(--accent-cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
  font-size: 0.92rem;
}

.warning-block {
  background: var(--accent-orange-dim);
  border-left: 3px solid var(--accent-orange);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
  font-size: 0.92rem;
}

.danger-block {
  background: var(--accent-red-dim);
  border-left: 3px solid var(--accent-red);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
  font-size: 0.92rem;
}

/* === INLINE CODE === */
.cmd {
  background: rgba(0, 255, 157, 0.1);
  color: var(--accent-green);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
}

/* === SECTION HEADERS === */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

.section-header .section-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: var(--space-md);
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-header .accent {
  color: var(--accent-green);
}

/* === BADGE/PILL === */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.pill:hover {
  transform: translateY(-1px);
  filter: brightness(1.15);
}

.pill.active {
  outline: 2px solid currentColor;
  outline-offset: 1px;
}

/* === FADE-IN ANIMATION === */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === SCROLLBAR === */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Scrollbar for Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.12) var(--bg-secondary);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.15rem; }

  .container {
    padding: 0 var(--space-md);
  }

  section {
    padding: var(--space-2xl) 0;
    min-height: auto;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 23, 0.97);
    backdrop-filter: blur(16px);
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-mobile-toggle {
    display: block;
  }

  .glass-card {
    padding: var(--space-lg);
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  .container { padding: 0 var(--space-sm); }
}