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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent2: #bc8cff;
  --green: #3fb950;
  --red: #f85149;
  --orange: #d29922;
  --pink: #f778ba;
  --radius: 12px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== Navigation ===== */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.nav-logo { font-weight: 800; font-size: 1.2rem; color: var(--text); }
.nav-logo:hover { text-decoration: none; }
.nav-links { display: flex; gap: 24px; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* ===== Main ===== */
main {
  max-width: 1100px; margin: 0 auto;
  padding: 40px 24px 80px;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 60px 0 40px;
}
.hero h1 {
  font-size: 3rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2), var(--pink));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}
.hero p { font-size: 1.15rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ===== Module Grid ===== */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.module-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s;
}
.module-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  text-decoration: none;
}
.module-card .card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}
.module-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.module-card p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 12px; }
.module-card .tech-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tech-tag {
  font-size: 0.7rem; font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--surface2);
  color: var(--accent);
  border: 1px solid var(--border);
}

/* ===== Section Headers ===== */
.section-title {
  font-size: 1.6rem; font-weight: 800;
  margin: 60px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

/* ===== Article Pages ===== */
.page-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}
.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 8px; }
.page-header .subtitle { font-size: 1.05rem; color: var(--text-secondary); }
.breadcrumb { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 8px; }
.breadcrumb a { color: var(--accent); }

article h2 {
  font-size: 1.4rem; font-weight: 700;
  margin: 40px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
article h3 { font-size: 1.15rem; font-weight: 600; margin: 28px 0 8px; }
article p { margin-bottom: 16px; }
article ul, article ol { margin: 0 0 16px 24px; }
article li { margin-bottom: 6px; }

/* ===== Code ===== */
code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: var(--surface2);
  padding: 2px 6px;
  border-radius: 4px;
}
pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin: 16px 0 24px;
}
pre code { background: none; padding: 0; font-size: 0.82rem; line-height: 1.6; }

/* ===== Tables ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 0.9rem;
}
th, td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--border);
}
th { background: var(--surface); font-weight: 600; }
td { background: var(--surface2); }

/* ===== Pros / Cons ===== */
.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 16px 0 24px; }
.pros, .cons {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
}
.pros h4 { color: var(--green); margin-bottom: 10px; }
.cons h4 { color: var(--red); margin-bottom: 10px; }
.pros li, .cons li { margin-bottom: 4px; font-size: 0.9rem; }

/* ===== Comparison Page ===== */
.comparison-table { overflow-x: auto; }
.comparison-table table { min-width: 800px; }
.comparison-table th:first-child { width: 160px; }
.rating { font-weight: 600; }
.rating.high { color: var(--green); }
.rating.mid { color: var(--orange); }
.rating.low { color: var(--red); }

/* ===== Demo List ===== */
.demo-list {
  display: grid; gap: 12px; margin: 16px 0 24px;
}
.demo-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
}
.demo-item h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.demo-item p { font-size: 0.85rem; color: var(--text-secondary); margin: 0; }

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
}
footer a { color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 700px) {
  .hero h1 { font-size: 2rem; }
  .module-grid { grid-template-columns: 1fr; }
  .pros-cons { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; }
}