/* ==========================================================================
   Linux on Android - Modern Design System & Stylesheet
   Domain: https://linuxonandroid.com/
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.3);

  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;

  --gradient-hero: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
  --gradient-glow: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.25), transparent 70%);

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Geometry & Shadows */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.25);
  --backdrop-blur: blur(16px);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1400px;
  height: 900px;
  background: var(--gradient-glow);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

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

ul {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(11, 15, 25, 0.8);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

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

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 160px 0 100px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: #a5b4fc;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

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

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--gradient-hero);
  color: #ffffff;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  box-shadow: var(--shadow-glow);
  transition: all 0.25 ease;
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(168, 85, 247, 0.4);
  color: #ffffff;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  backdrop-filter: var(--backdrop-blur);
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* Hero Showcase Frame */
.hero-mockup-wrapper {
  position: relative;
}

.hero-mockup-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
  filter: blur(40px);
  z-index: -1;
}

.phone-frame {
  background: #1e293b;
  border: 4px solid #334155;
  border-radius: 36px;
  padding: 12px;
  box-shadow: var(--shadow-lg), 0 0 50px rgba(0, 0, 0, 0.8);
  max-width: 340px;
  margin: 0 auto;
}

.phone-screen {
  border-radius: 26px;
  overflow: hidden;
  background: #000;
}

/* Stats Ribbon */
.stats-section {
  padding: 40px 0;
  border-y: 1px solid var(--border-color);
  background: rgba(17, 24, 39, 0.4);
  margin-top: 40px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-num {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-tag {
  text-transform: uppercase;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* Features Grid */
.features {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  backdrop-filter: var(--backdrop-blur);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-hero);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-lg);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(99, 102, 241, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent-primary);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Interactive Stacks Showcase Section */
.stacks-section {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-y: 1px solid var(--border-color);
}

.tab-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover, .tab-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.stack-content {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.stack-panel {
  display: none;
}

.stack-panel.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.stack-info h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.stack-info p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 24px;
}

.tag-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.tag-item {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

/* Terminal Window Box */
.terminal-window {
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  font-family: var(--font-mono);
}

.terminal-header {
  background: #161b22;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #30363d;
}

.terminal-dots {
  display: flex;
  gap: 8px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.terminal-title {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 20px;
  font-size: 0.85rem;
  color: #c9d1d9;
  line-height: 1.7;
  overflow-x: auto;
}

.prompt { color: var(--accent-emerald); font-weight: 700; }
.cmd { color: #58a6ff; }
.output { color: #8b949e; }
.highlight { color: var(--accent-amber); }

/* History Timeline Section */
.history-section {
  padding: 100px 0;
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--border-color);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: 50px;
  width: 50%;
  padding: 0 40px;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
}

.timeline-item:nth-child(even) {
  left: 50%;
  text-align: left;
}

.timeline-dot {
  position: absolute;
  top: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 4px solid var(--bg-primary);
  box-shadow: 0 0 10px var(--accent-primary);
}

.timeline-item:nth-child(odd) .timeline-dot { right: -9px; }
.timeline-item:nth-child(even) .timeline-dot { left: -9px; }

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: var(--radius-md);
  backdrop-filter: var(--backdrop-blur);
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.timeline-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.archive-links {
  margin-top: 12px;
  display: flex;
  gap: 12px;
  justify-content: inherit;
  flex-wrap: wrap;
}

.archive-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-primary);
}

/* Quick Setup Walkthrough Section */
.setup-section {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.step-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  position: relative;
}

.step-num {
  font-size: 3rem;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.08);
  position: absolute;
  top: 16px;
  right: 20px;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* Footer */
footer {
  background: #070a12;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 400px;
}

.footer-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links li {
  margin-bottom: 10px;
}

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

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-ctas {
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .stack-panel.active {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    width: 100%;
    left: 0 !important;
    padding-left: 50px;
    padding-right: 0;
    text-align: left !important;
  }

  .timeline-dot {
    left: 11px !important;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
  }

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

  .mobile-toggle {
    display: block;
  }
}