/* === AID Language Website === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;900&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg: #0a0a0f;
  --bg-card: #12121a;
  --bg-code: #0d0d14;
  --border: #1a1a2e;
  --text: #e4e4ef;
  --text-dim: #8888a0;
  --accent: #00d4ff;
  --accent-glow: rgba(0, 212, 255, 0.15);
  --gold: #ffb347;
  --green: #4ade80;
  --red: #f87171;
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

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

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* === Animations === */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Nav === */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
nav .container { display: flex; align-items: center; justify-content: space-between; }
nav .logo { font-weight: 900; font-size: 1.4rem; color: var(--accent); letter-spacing: -1px; }
nav .links { display: flex; gap: 24px; }
nav .links a { color: var(--text-dim); font-size: 0.9rem; font-weight: 500; }
nav .links a:hover { color: var(--text); text-decoration: none; }

/* === Hero === */
.hero {
  padding: 160px 0 100px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 900;
  letter-spacing: -3px;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}
.hero .tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-dim);
  margin-top: 16px;
  font-weight: 500;
}
.hero .desc {
  max-width: 600px;
  margin: 20px auto 0;
  color: var(--text-dim);
  font-size: 1.05rem;
}
.hero .cta {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s;
  border: none; cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover { background: #33ddff; text-decoration: none; }
.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--accent); text-decoration: none; }

/* === Section === */
section { padding: 80px 0; }
section h2 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 12px;
}
section .section-sub {
  color: var(--text-dim);
  font-size: 1.1rem;
  margin-bottom: 48px;
  max-width: 650px;
}

/* === Code Tabs === */
.code-tabs { display: flex; gap: 0; margin-bottom: 0; }
.code-tab {
  padding: 10px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-bottom: none;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  transition: all 0.2s;
}
.code-tab.active { background: var(--bg-code); color: var(--accent); border-color: var(--accent); border-bottom-color: var(--bg-code); }
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 0 8px 8px 8px;
  padding: 24px 28px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  line-height: 1.8;
  display: none;
}
.code-block.active { display: block; }

/* Syntax colors */
.kw { color: var(--accent); }
.str { color: var(--green); }
.cmt { color: var(--text-dim); font-style: italic; }
.ai { color: var(--gold); font-weight: 500; }
.fn-name { color: #c4b5fd; }
.num { color: #f87171; }
.type { color: #f0abfc; }
.op { color: var(--text-dim); }

/* === Features Grid === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: border-color 0.3s, transform 0.3s;
}
.feature-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.feature-card .icon { font-size: 1.8rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { color: var(--text-dim); font-size: 0.95rem; line-height: 1.6; }

/* === Pipeline === */
.pipeline {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding: 20px 0;
  flex-wrap: wrap;
  justify-content: center;
}
.pipeline-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  min-width: 110px;
}
.pipeline-step.highlight { border-color: var(--accent); color: var(--accent); }
.pipeline-arrow {
  color: var(--text-dim);
  font-size: 1.2rem;
  padding: 0 6px;
  flex-shrink: 0;
}
.pipeline-branch {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* === Reason Detailed === */
.reason-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 768px) { .reason-grid { grid-template-columns: 1fr; } }
.reason-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gold);
  background: rgba(255, 179, 71, 0.1);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.reason-note {
  margin-top: 24px;
  padding: 16px 20px;
  border-left: 3px solid var(--gold);
  background: rgba(255, 179, 71, 0.05);
  border-radius: 0 8px 8px 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* === Getting Started === */
.install-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 32px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  line-height: 2;
  max-width: 550px;
}
.install-block .prompt { color: var(--accent); }
.install-block .cmd { color: var(--text); }
.install-block .cmt { color: var(--text-dim); }

/* === Comparison Table === */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.comparison-table th, .comparison-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.comparison-table th {
  font-weight: 700;
  color: var(--text);
  background: var(--bg-card);
}
.comparison-table th:first-child, .comparison-table td:first-child { text-align: left; }
.comparison-table td { color: var(--text-dim); }
.comparison-table tr:hover td { background: rgba(0, 212, 255, 0.03); }
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
}

/* === License === */
.license-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  max-width: 600px;
}
.license-box h3 { font-size: 1.3rem; margin-bottom: 12px; }
.license-box ul { list-style: none; padding: 0; }
.license-box li { padding: 6px 0; color: var(--text-dim); }
.license-box li::before { content: '✓ '; color: var(--green); font-weight: 700; }

/* === Footer === */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
}
footer .footer-links { display: flex; gap: 24px; justify-content: center; margin-bottom: 16px; }
footer .footer-links a { color: var(--text-dim); }
footer .footer-links a:hover { color: var(--accent); }
footer .credit { margin-bottom: 8px; }

/* === Version Badge === */
.version-badge {
  font-size: 0.6rem;
  font-weight: 600;
  background: var(--accent);
  color: var(--bg);
  padding: 2px 8px;
  border-radius: 4px;
  vertical-align: middle;
  margin-left: 6px;
  letter-spacing: 0.5px;
}

/* === Hero Badge === */
.hero-badge {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gold);
  background: rgba(255, 179, 71, 0.1);
  border: 1px solid rgba(255, 179, 71, 0.3);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

/* === Hero Stats === */
.hero-stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  margin-top: 48px;
}
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num { font-size: 2rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; margin-top: 4px; }

/* === Stdlib Grid === */
.stdlib-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.stdlib-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: border-color 0.3s;
}
.stdlib-card:hover { border-color: var(--accent); }
.stdlib-header { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.stdlib-icon { font-size: 1.4rem; }
.stdlib-header h3 { font-size: 1.1rem; font-weight: 700; margin: 0; color: var(--accent); }
.stdlib-tag {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-dim);
  background: rgba(136, 136, 160, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  margin-left: auto;
}
.stdlib-card p { color: var(--text-dim); font-size: 0.9rem; line-height: 1.6; margin-bottom: 12px; }
.code-inline {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  line-height: 1.8;
  overflow-x: auto;
}

/* === Cortex Section === */
.cortex-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 768px) { .cortex-grid { grid-template-columns: 1fr; } }
.cortex-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-width: 32px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 800;
  border-radius: 50%;
  font-size: 0.9rem;
}
.cortex-step h4 { font-size: 1rem; margin-bottom: 4px; }
.cortex-step code { font-size: 0.85rem; color: var(--accent); }
.cortex-step p { color: var(--text-dim); font-size: 0.85rem; margin-top: 4px; }
.cortex-fallback {
  padding: 16px 20px;
  border-left: 3px solid var(--green);
  background: rgba(74, 222, 128, 0.05);
  border-radius: 0 8px 8px 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* === Showcase === */
.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 768px) { .showcase-grid { grid-template-columns: 1fr; } }
.showcase-features { display: flex; flex-direction: column; gap: 12px; }
.showcase-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-dim);
  transition: border-color 0.2s;
}
.showcase-item:hover { border-color: var(--accent); }
.showcase-item span { font-size: 1.2rem; }

/* === Responsive === */
@media (max-width: 640px) {
  section { padding: 60px 0; }
  .hero { padding: 120px 0 60px; }
  nav .links { gap: 12px; }
  nav .links a { font-size: 0.8rem; }
  .pipeline { gap: 4px; }
  .pipeline-step { padding: 10px 12px; font-size: 0.8rem; min-width: 80px; }
}