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

:root {
  --bg:       #0d0d0f;
  --bg2:      #111114;
  --bg3:      #17171b;
  --border:   #2a2a30;
  --text:     #e8e8ed;
  --sub:      #888896;
  --red:      #ff5c5c;
  --yellow:   #f0c040;
  --green:    #4ade80;
  --accent:   #7c6af7;
  --accent2:  #a78bfa;
  --mono:     'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --sans:     -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg3);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent2);
}

/* ─── Nav ───────────────────────────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(13,13,15,0.85);
  backdrop-filter: blur(12px);
}

nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo { display: flex; align-items: baseline; gap: 0.5rem; }
.logo-cmd {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}
.logo-version {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--sub);
  background: var(--bg3);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-links a { color: var(--sub); font-size: 0.9rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.btn-nav {
  background: var(--accent);
  color: #fff !important;
  padding: 0.4em 1em;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.2s;
}
.btn-nav:hover { background: var(--accent2); }

/* ─── Buttons ───────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.7em 1.6em;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s, transform 0.1s;
}
.btn-primary:hover { background: var(--accent2); text-decoration: none; transform: translateY(-1px); }

.btn-secondary {
  display: inline-block;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.7em 1.6em;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: border-color 0.2s, background 0.2s;
}
.btn-secondary:hover { border-color: var(--accent); text-decoration: none; background: var(--bg3); }

/* ─── Hero ──────────────────────────────────────────────────────────── */
.hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--green);
  background: rgba(74,222,128,0.08);
  border: 1px solid rgba(74,222,128,0.2);
  padding: 0.3em 0.9em;
  border-radius: 99px;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #fff 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--sub);
  max-width: 580px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
}

/* ─── Terminal ──────────────────────────────────────────────────────── */
.terminal {
  background: #0a0a0c;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  text-align: left;
  box-shadow: 0 24px 60px rgba(0,0,0,0.6);
  max-width: 680px;
  margin: 0 auto;
}

.terminal-bar {
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red    { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green  { background: #28c840; }
.terminal-title { margin-left: auto; font-size: 0.75rem; color: var(--sub); font-family: var(--mono); }

.terminal-body {
  padding: 1.2rem 1.4rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.8;
}
.term-line { display: block; }
.term-line .prompt { color: var(--green); margin-right: 0.5em; }
.term-line.out { color: var(--sub); padding-left: 0; }
.term-line .red    { color: var(--red); }
.term-line .yellow { color: var(--yellow); }
.term-line .green  { color: var(--green); }
.term-line .dim    { color: #555; }
.cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ─── Stats ─────────────────────────────────────────────────────────── */
.stats {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: 1100px;
  margin: 0 auto;
}

.stat {
  padding: 2.5rem 2rem;
  text-align: center;
  border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; }

.stat-num {
  font-family: var(--mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent2);
  margin-bottom: 0.4rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--sub);
  line-height: 1.4;
}

/* ─── Features ──────────────────────────────────────────────────────── */
.features {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.features h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 3rem;
  text-align: center;
  color: var(--text);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.8rem;
  transition: border-color 0.2s;
}
.feature-card:hover { border-color: var(--accent); }

.feature-icon { font-size: 1.8rem; margin-bottom: 0.8rem; }
.feature-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.88rem; color: var(--sub); line-height: 1.6; }
.feature-card code { font-size: 0.82em; }

.feature-card-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  cursor: pointer;
}
.feature-card-link:hover { text-decoration: none; }
.feature-card-link h3 { color: var(--text); }
.feature-card-cta {
  margin-top: auto;
  padding-top: 0.8rem;
  font-size: 0.8rem;
  color: var(--accent2);
  font-weight: 500;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s, transform 0.2s;
}
.feature-card-link:hover .feature-card-cta {
  opacity: 1;
  transform: translateX(0);
}

/* ─── Algorithm teaser ──────────────────────────────────────────────── */
.algorithm-teaser {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  border-top: 1px solid var(--border);
}

.algo-text h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
}
.algo-text p {
  color: var(--sub);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.algo-code {
  background: #0a0a0c;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.algo-code pre {
  padding: 1.5rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.7;
  overflow-x: auto;
}

.algo-code .kw  { color: #c084fc; }
.algo-code .fn  { color: #60a5fa; }
.algo-code .cmt { color: #4b5563; }
.algo-code .num { color: var(--yellow); }

/* ─── Install ───────────────────────────────────────────────────────── */
.install {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 5rem 2rem;
  text-align: center;
}

.install h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.install-sub { color: var(--sub); margin-bottom: 2rem; }

.install-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab {
  background: none;
  border: 1px solid var(--border);
  color: var(--sub);
  padding: 0.4em 1em;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: var(--mono);
  transition: all 0.2s;
}
.tab:hover, .tab.active {
  background: var(--bg3);
  color: var(--text);
  border-color: var(--accent);
}

.install-block { display: none; }
.install-block.active { display: block; }

.code-block {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: #0a0a0c;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8em 1.2em;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--green);
}

.copy-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--sub);
  padding: 0.2em 0.6em;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.2s;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }

/* ─── Philosophy ────────────────────────────────────────────────────── */
.philosophy {
  padding: 5rem 2rem;
  text-align: center;
}

blockquote {
  font-size: clamp(1.2rem, 2.5vw, 1.7rem);
  font-style: italic;
  color: var(--text);
  line-height: 1.5;
  max-width: 600px;
  margin: 0 auto 1rem;
  font-weight: 300;
}

.phil-sub { color: var(--sub); font-size: 0.85rem; font-family: var(--mono); }

/* ─── Contributing ──────────────────────────────────────────────────── */
.contributing {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 4rem 2rem;
  text-align: center;
}
.contributing h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 1rem; }
.contributing p { color: var(--sub); margin-bottom: 2rem; font-size: 0.95rem; }

/* ─── Footer ────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.footer-logo {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--sub);
}

.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--sub); font-size: 0.85rem; }
.footer-links a:hover { color: var(--text); text-decoration: none; }

.footer-copy { color: var(--sub); font-size: 0.78rem; text-align: right; line-height: 1.5; }

/* ─── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat { border-right: none; border-bottom: 1px solid var(--border); }
  .feature-grid { grid-template-columns: 1fr; }
  .algorithm-teaser { grid-template-columns: 1fr; gap: 2rem; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-copy { text-align: center; }
  .nav-links { gap: 1rem; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2.4rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .stats { grid-template-columns: 1fr 1fr; }
}