/* === Cellular Automata Portfolio — Dark Theme === */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2128;
  --bg-input: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-dim: #1f6feb33;
  --green: #3fb950;
  --red: #f85149;
  --orange: #d29922;
  --purple: #bc8cff;
  --cyan: #39d2c0;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,.3);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-hover); }

/* === Layout === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* === Navigation === */
.site-nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: .75rem 0;
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(12px);
}
.site-nav .container {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .5rem;
}
.site-nav .brand {
  font-weight: 700; font-size: 1.1rem; color: var(--text-primary);
  display: flex; align-items: center; gap: .5rem;
}
.site-nav .brand span { color: var(--accent); }
.site-nav nav { display: flex; gap: .25rem; flex-wrap: wrap; }
.site-nav nav a {
  padding: .4rem .75rem; border-radius: var(--radius); font-size: .85rem;
  color: var(--text-secondary); transition: all .2s;
}
.site-nav nav a:hover, .site-nav nav a.active {
  background: var(--accent-dim); color: var(--accent);
}

/* === Cards === */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.5rem;
  transition: transform .2s, border-color .2s;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card h3 { margin-bottom: .5rem; }
.card p { color: var(--text-secondary); font-size: .9rem; }

.card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem; margin: 2rem 0;
}

/* === Project Page Layout === */
.project-page {
  display: flex; flex-direction: column; min-height: 100vh;
}
.project-page main {
  flex: 1; padding: 1.5rem 0;
}
.project-content {
  display: grid; grid-template-columns: 1fr 320px; gap: 1.5rem; align-items: start;
}
@media (max-width: 900px) {
  .project-content { grid-template-columns: 1fr; }
}

/* === Canvas === */
.canvas-wrap {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1rem; text-align: center;
  overflow: hidden;
}
.canvas-wrap canvas {
  max-width: 100%; height: auto; display: block; margin: 0 auto;
  image-rendering: pixelated; border-radius: var(--radius);
}

/* === Controls Panel === */
.controls {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.25rem;
  display: flex; flex-direction: column; gap: 1rem;
}
.controls h3 {
  font-size: 1rem; color: var(--text-secondary);
  border-bottom: 1px solid var(--border); padding-bottom: .5rem;
  margin-bottom: .25rem;
}

.control-group { display: flex; flex-direction: column; gap: .35rem; }
.control-group label {
  font-size: .8rem; color: var(--text-secondary); font-weight: 500;
  text-transform: uppercase; letter-spacing: .05em;
}

/* === Form Elements === */
input[type="text"], input[type="number"], select, textarea {
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius); padding: .5rem .75rem;
  color: var(--text-primary); font-family: var(--font-mono);
  font-size: .9rem; width: 100%; transition: border-color .2s;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

input[type="range"] {
  -webkit-appearance: none; width: 100%; height: 6px;
  background: var(--bg-input); border-radius: 3px; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px;
  background: var(--accent); border-radius: 50%; cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; background: var(--accent);
  border-radius: 50%; cursor: pointer; border: none;
}

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .5rem 1rem; border-radius: var(--radius);
  font-size: .9rem; font-weight: 500; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg-input);
  color: var(--text-primary); transition: all .2s; font-family: var(--font);
}
.btn:hover { border-color: var(--text-secondary); color: var(--text-primary); }

.btn-primary {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }

.btn-success { background: var(--green); border-color: var(--green); color: #fff; }
.btn-success:hover { opacity: .9; color: #fff; }

.btn-danger { background: var(--red); border-color: var(--red); color: #fff; }
.btn-danger:hover { opacity: .9; color: #fff; }

.btn-sm { padding: .35rem .65rem; font-size: .8rem; }

.btn-group { display: flex; gap: .5rem; flex-wrap: wrap; }

/* === Speed Control === */
.speed-control {
  display: flex; align-items: center; gap: .75rem;
}
.speed-control .speed-label {
  font-size: .8rem; color: var(--text-muted); min-width: 3em; text-align: right;
  font-family: var(--font-mono);
}

/* === Info Box === */
.info-box {
  background: var(--accent-dim); border: 1px solid rgba(88,166,255,.2);
  border-radius: var(--radius); padding: 1rem; font-size: .85rem;
  line-height: 1.5; color: var(--text-secondary);
}
.info-box strong { color: var(--text-primary); }

/* === Stats === */
.stat-row {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .85rem; padding: .25rem 0;
}
.stat-row .stat-label { color: var(--text-secondary); }
.stat-row .stat-value { color: var(--text-primary); font-family: var(--font-mono); }

/* === Tags === */
.tag {
  display: inline-block; padding: .15rem .5rem; border-radius: 2rem;
  font-size: .75rem; font-weight: 500;
  background: var(--accent-dim); color: var(--accent);
  border: 1px solid rgba(88,166,255,.2);
}
.tag-green { background: rgba(63,185,80,.15); color: var(--green); border-color: rgba(63,185,80,.2); }
.tag-purple { background: rgba(188,140,255,.15); color: var(--purple); border-color: rgba(188,140,255,.2); }
.tag-orange { background: rgba(210,153,34,.15); color: var(--orange); border-color: rgba(210,153,34,.2); }

/* === Footer === */
.site-footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border);
  padding: 1.5rem 0; text-align: center; color: var(--text-muted);
  font-size: .8rem; margin-top: auto;
}
.site-footer a { color: var(--text-secondary); }

/* === Hero (Landing) === */
.hero {
  text-align: center; padding: 4rem 0 2rem;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: .75rem;
}
.hero p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }
.hero .meta {
  margin-top: 1rem; display: flex; gap: .5rem; justify-content: center; flex-wrap: wrap;
}

/* === Section Headers === */
.section-header {
  margin: 3rem 0 1rem; padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
}
.section-header h2 { font-size: 1.3rem; font-weight: 700; }

/* === Responsive === */
@media (max-width: 600px) {
  .card-grid { grid-template-columns: 1fr; }
  .hero { padding: 2rem 0 1rem; }
  .site-nav nav a { padding: .3rem .5rem; font-size: .8rem; }
}

/* === Print === */
@media print {
  .site-nav, .site-footer, .controls { display: none; }
  body { background: #fff; color: #000; }
}