@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ===== Standalone Pages — Modern Dark Theme ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --pg-bg: #0a0a0f;
  --pg-bg-alt: #12121a;
  --pg-surface: rgba(255,255,255,0.03);
  --pg-border: rgba(255,255,255,0.06);
  --pg-text: #e2e2ea;
  --pg-text-muted: #8888a0;
  --pg-accent: #6366f1;
  --pg-accent2: #8b5cf6;
  --pg-accent-glow: rgba(99,102,241,0.15);
  --pg-green: #34d399;
  --pg-orange: #fb923c;
  --pg-pink: #f472b6;
  --pg-cyan: #22d3ee;
  --pg-radius: 14px;
  --pg-font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --pg-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--pg-font);
  background: var(--pg-bg);
  color: var(--pg-text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--pg-accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--pg-accent2); }

/* ===== Nav ===== */
.page-nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 40px;
  background: rgba(10,10,15,0.8);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--pg-border);
}
.page-nav .nav-brand {
  font-family: var(--pg-mono);
  font-size: 1.2rem; font-weight: 700;
  background: linear-gradient(135deg, var(--pg-accent), var(--pg-accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-nav .nav-links { display: flex; gap: 36px; align-items: center; }
.page-nav .nav-links a {
  color: var(--pg-text-muted); font-size: 1.3rem; font-weight: 600;
  font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  letter-spacing: 0.02em;
  transition: color .2s;
}
.page-nav .nav-links a:hover { color: var(--pg-text); }
.page-nav .nav-links a:last-child { margin-left: 16px; }

/* ===== Hero ===== */
.page-hero {
  position: relative; overflow: hidden;
  padding: 100px 40px 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--pg-bg) 0%, var(--pg-bg-alt) 100%);
}
.page-hero::before {
  content: '';
  position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 800px; height: 800px;
  background: radial-gradient(circle, var(--pg-accent-glow) 0%, transparent 70%);
  pointer-events: none;
}
.page-hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 800; letter-spacing: -0.03em;
  line-height: 1.15;
  background: linear-gradient(135deg, #fff 30%, var(--pg-accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}
.page-hero .hero-sub {
  font-size: 1.15rem; color: var(--pg-text-muted);
  max-width: 540px; margin: 0 auto 36px;
}
.page-hero .hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ===== Buttons ===== */
.btn-hero {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 10px;
  font-size: 0.95rem; font-weight: 600;
  border: none; cursor: pointer; transition: all .25s;
}
.btn-hero-primary {
  background: linear-gradient(135deg, var(--pg-accent), var(--pg-accent2));
  color: #fff;
  box-shadow: 0 4px 24px var(--pg-accent-glow);
}
.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(99,102,241,0.3);
  color: #fff;
}
.btn-hero-ghost {
  background: var(--pg-surface);
  color: var(--pg-text);
  border: 1px solid var(--pg-border);
}
.btn-hero-ghost:hover {
  background: rgba(255,255,255,0.06);
  transform: translateY(-2px);
  color: var(--pg-text);
}

/* ===== Section ===== */
.page-section {
  padding: 80px 40px;
  max-width: 1100px; margin: 0 auto;
}
.page-section-title {
  text-align: center; margin-bottom: 48px;
}
.page-section-title h2 {
  font-size: 1.8rem; font-weight: 700;
  margin-bottom: 10px;
}
.page-section-title p {
  color: var(--pg-text-muted); font-size: 1rem;
}

/* ===== Feature Cards ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--pg-surface);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  padding: 28px;
  transition: all .3s;
}
.feature-card:hover {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.1);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.feature-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 1.05rem; font-weight: 600;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 0.9rem; color: var(--pg-text-muted);
  line-height: 1.6;
}

/* icon bg colors */
.fi-purple { background: rgba(99,102,241,0.15); }
.fi-green  { background: rgba(52,211,153,0.15); }
.fi-orange { background: rgba(251,146,60,0.15); }
.fi-pink   { background: rgba(244,114,182,0.15); }
.fi-cyan   { background: rgba(34,211,238,0.15); }
.fi-yellow { background: rgba(250,204,21,0.15); }

/* ===== Tech Stack ===== */
.tech-grid {
  display: flex; flex-wrap: wrap; gap: 16px; justify-content: center;
}
.tech-item {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 22px;
  background: var(--pg-surface);
  border: 1px solid var(--pg-border);
  border-radius: 12px;
  font-size: 0.9rem; font-weight: 500;
  transition: all .25s;
}
.tech-item:hover {
  border-color: rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.05);
}
.tech-dot {
  width: 8px; height: 8px; border-radius: 50%;
}

/* ===== Quick Start ===== */
.quickstart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}
.quickstart-card {
  background: var(--pg-surface);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  padding: 28px;
}
.quickstart-card h3 {
  font-size: 1rem; font-weight: 600;
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.quickstart-card pre {
  background: #0d0d14;
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 10px;
  padding: 18px 20px;
  font-family: var(--pg-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--pg-text);
  overflow-x: auto;
}
.quickstart-card pre code {
  font-family: inherit;
}

/* ===== Footer ===== */
.page-footer {
  padding: 40px;
  text-align: center;
  border-top: 1px solid var(--pg-border);
  color: var(--pg-text-muted);
  font-size: 0.85rem;
}
.page-footer a { color: var(--pg-text-muted); }
.page-footer a:hover { color: var(--pg-text); }

/* ========================================
   Tutorial / Docs Page
   ======================================== */

/* ===== Docs Layout ===== */
.docs-layout {
  display: flex;
  max-width: 1200px; margin: 0 auto;
  padding: 40px 40px 80px;
  gap: 48px;
}

/* ===== Sidebar ===== */
.docs-sidebar {
  width: 240px; flex-shrink: 0;
  position: sticky; top: 80px;
  align-self: flex-start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}
.docs-sidebar h3 {
  font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--pg-text-muted);
  margin-bottom: 14px;
}
.docs-sidebar ul { list-style: none; }
.docs-sidebar li { margin-bottom: 2px; }
.docs-sidebar a {
  display: block;
  padding: 7px 14px;
  font-size: 0.88rem;
  color: var(--pg-text-muted);
  border-radius: 8px;
  border-left: 2px solid transparent;
  transition: all .2s;
}
.docs-sidebar a:hover {
  color: var(--pg-text);
  background: var(--pg-surface);
}
.docs-sidebar a.active {
  color: var(--pg-accent);
  border-left-color: var(--pg-accent);
  background: var(--pg-accent-glow);
}

/* ===== Docs Content ===== */
.docs-content {
  flex: 1; min-width: 0;
}
.docs-content h1 {
  font-size: 2rem; font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #fff 30%, var(--pg-accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.docs-content > p.intro {
  font-size: 1.05rem; color: var(--pg-text-muted);
  margin-bottom: 40px;
}
.docs-content h2 {
  font-size: 1.4rem; font-weight: 700;
  margin-top: 48px; margin-bottom: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--pg-border);
}
.docs-content h2:first-of-type { border-top: none; padding-top: 0; }
.docs-content h3 {
  font-size: 1.1rem; font-weight: 600;
  margin-top: 28px; margin-bottom: 10px;
}
.docs-content p {
  margin-bottom: 14px; line-height: 1.75;
}
.docs-content ul, .docs-content ol {
  margin-bottom: 16px; padding-left: 24px;
}
.docs-content li { margin-bottom: 6px; line-height: 1.7; }
.docs-content strong { font-weight: 600; color: #fff; }

/* Code */
.docs-content code {
  font-family: var(--pg-mono);
  font-size: 0.88em;
  background: rgba(255,255,255,0.06);
  padding: 2px 7px;
  border-radius: 5px;
  color: var(--pg-pink);
}
.docs-content pre {
  background: #0d0d14;
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 20px;
  overflow-x: auto;
}
.docs-content pre code {
  font-family: var(--pg-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  background: none;
  padding: 0;
  color: var(--pg-text);
}

/* Tables */
.docs-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 0.9rem;
}
.docs-content th {
  text-align: left;
  padding: 10px 14px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--pg-border);
  font-weight: 600;
  color: var(--pg-text-muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.docs-content td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}
.docs-content tr:last-child td { border-bottom: none; }

/* Mermaid */
.docs-content .mermaid {
  background: var(--pg-surface);
  border: 1px solid var(--pg-border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  text-align: center;
}
.docs-content .mermaid svg { max-width: 100%; }
.docs-content .mermaid-error {
  color: #f87171; font-size: 0.85rem;
  padding: 12px; background: rgba(248,113,113,0.1);
  border-radius: 8px;
}

/* Navigation links at bottom */
.docs-nav-links {
  display: flex; justify-content: space-between;
  margin-top: 48px; padding-top: 24px;
  border-top: 1px solid var(--pg-border);
}
.docs-nav-links a {
  font-size: 0.9rem; font-weight: 500;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .page-nav { padding: 14px 20px; }
  .page-nav .nav-links { gap: 16px; }
  .page-nav .nav-links a { font-size: 0.9rem; }
  .page-nav .nav-links a:last-child { margin-left: 8px; }
  .page-nav .nav-links svg { width: 28px; height: 28px; }
  .page-hero { padding: 60px 20px 50px; }
  .page-section { padding: 50px 20px; }
  .feature-grid { grid-template-columns: 1fr; }
  .quickstart-grid { grid-template-columns: 1fr; }

  .docs-layout { flex-direction: column; padding: 20px; gap: 24px; }
  .docs-sidebar {
    position: static; width: 100%;
    max-height: none;
    padding: 16px;
    background: var(--pg-surface);
    border: 1px solid var(--pg-border);
    border-radius: var(--pg-radius);
  }
  .docs-content h1 { font-size: 1.6rem; }
}