/* ============================================================
   Cyberpunk Design System — base.css
   Dark theme with neon accents, glow effects, geometric patterns
   ============================================================ */

/* ----- CSS Custom Properties ----- */
:root {
  /* Core backgrounds */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2332;
  --bg-card-hover: #1f2d3f;

  /* Neon accents */
  --neon-cyan: #00f0ff;
  --neon-magenta: #ff00aa;
  --neon-yellow: #ffe600;
  --neon-green: #00ff88;
  --neon-red: #ff3355;
  --neon-purple: #aa00ff;

  /* Glow variants */
  --glow-cyan: 0 0 12px rgba(0, 240, 255, 0.4);
  --glow-cyan-strong: 0 0 24px rgba(0, 240, 255, 0.6);
  --glow-magenta: 0 0 12px rgba(255, 0, 170, 0.4);
  --glow-yellow: 0 0 10px rgba(255, 230, 0, 0.35);
  --glow-card: 0 0 20px rgba(0, 240, 255, 0.08);

  /* Text */
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Borders */
  --border-subtle: 1px solid rgba(0, 240, 255, 0.12);
  --border-cyan: 1px solid rgba(0, 240, 255, 0.3);
  --border-magenta: 1px solid rgba(255, 0, 170, 0.3);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --nav-height: 52px;

  /* Typography */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", "JetBrains Mono", monospace;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-out);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
}

/* Grid background pattern */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 240, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: -1;
}

/* Subtle scanline overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
  pointer-events: none;
  z-index: -1;
}

/* ----- Typography ----- */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  line-height: 1.3;
  margin: 0 0 var(--space-md);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  border-left: 3px solid var(--neon-magenta);
  padding-left: var(--space-md);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--neon-cyan);
}

p { margin: 0 0 var(--space-md); }

a {
  color: var(--neon-cyan);
  text-decoration: none;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

a:hover {
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
  text-decoration: underline;
}

img, video {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

code, pre {
  font-family: var(--font-mono);
  background: rgba(0, 240, 255, 0.06);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
}

code {
  padding: 2px 6px;
  font-size: 0.9em;
  color: var(--neon-cyan);
}

pre {
  padding: var(--space-md);
  overflow-x: auto;
  line-height: 1.5;
}

/* ----- Layout Containers ----- */
.wrap {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--glow-card);
}

.wrap + .wrap {
  margin-top: var(--space-xl);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: var(--space-lg);
}

/* ----- Card Grid ----- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  padding: 0;
  list-style: none;
}

.card {
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base),
              border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--glow-cyan);
  border-color: rgba(0, 240, 255, 0.4);
}

.card h2, .card h3 {
  margin-top: 0;
  border-left: none;
  padding-left: 0;
}

/* ----- Buttons ----- */
.btn {
  display: inline-block;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--neon-cyan);
  background: transparent;
  border: 1px solid var(--neon-cyan);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn:hover {
  background: rgba(0, 240, 255, 0.1);
  box-shadow: var(--glow-cyan);
  text-shadow: var(--glow-cyan);
  text-decoration: none;
  color: var(--neon-cyan);
}

/* ----- Lists ----- */
ul, ol {
  padding-left: 1.5em;
  margin: 0 0 var(--space-md);
}

li { margin: var(--space-xs) 0; }

/* ----- Tables ----- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: var(--border-subtle);
}

th {
  color: var(--neon-cyan);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

tr:hover td {
  background: rgba(0, 240, 255, 0.03);
}

/* ----- Navigation Bar ----- */
#cyber-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  transition: border-color var(--transition-base);
}

#cyber-nav::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--neon-cyan) 20%,
    var(--neon-magenta) 50%,
    var(--neon-cyan) 80%,
    transparent 100%
  );
  opacity: 0.6;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
  letter-spacing: 0.05em;
  text-decoration: none;
  white-space: nowrap;
}

.nav-brand:hover {
  text-decoration: none;
  text-shadow: var(--glow-cyan-strong);
}

.nav-links {
  display: flex;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  display: block;
  padding: 6px 14px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
  background: rgba(0, 240, 255, 0.06);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--neon-cyan);
  background: rgba(0, 240, 255, 0.08);
  box-shadow: inset 0 0 0 1px rgba(0, 240, 255, 0.2);
}

/* Hamburger menu button */
.nav-hamburger {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1.3rem;
  padding: 4px 10px;
  cursor: pointer;
  line-height: 1;
  transition: all var(--transition-fast);
}

.nav-hamburger:hover {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}

/* Mobile nav overlay */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--nav-height);
  background: rgba(10, 14, 23, 0.97);
  backdrop-filter: blur(12px);
  z-index: 9998;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

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

.nav-overlay a {
  font-size: 1.3rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-overlay a:hover,
.nav-overlay a.active {
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
}

/* Body padding for fixed nav */
body.has-cyber-nav {
  padding-top: calc(var(--nav-height) + var(--space-lg));
}

/* ----- Hero Section (home page) ----- */
.cyber-hero {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  position: relative;
}

.cyber-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-sm);
}

.cyber-hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* ----- Utility classes ----- */
.text-cyan { color: var(--neon-cyan); }
.text-magenta { color: var(--neon-magenta); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ----- Responsive ----- */
@media (max-width: 768px) {
  :root {
    --container-max: 100%;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;
  }

  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.4rem; }

  .wrap {
    margin: 0 var(--space-sm);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
  }

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

  .cyber-hero h1 {
    font-size: 2rem;
  }

  .nav-hamburger { display: block; }
  .nav-links { display: none; }

  #cyber-nav {
    padding: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  body { font-size: 15px; }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.2rem; }

  .cyber-hero {
    padding: var(--space-xl) var(--space-md);
  }

  .cyber-hero h1 {
    font-size: 1.6rem;
  }
}