*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg-primary: #1e1e2e;
  --bg-secondary: #181825;
  --bg-surface: #252538;
  --bg-hover: #313147;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --text-muted: #6c7086;
  --accent: #89b4fa;
  --accent-hover: #74c7ec;
  --green: #a6e3a1;
  --yellow: #f9e2af;
  --red: #f38ba8;
  --orange: #fab387;
  --mauve: #cba6f7;
  --border: #45475a;
  --radius: 8px;
}
html, body {
  height: 100%;
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* ===== GitHub Corner Ribbon ===== */
.github-corner svg { fill: var(--accent); color: var(--bg-primary); position: absolute; top: 0; right: 0; border: 0; z-index: 10; }
.github-corner:hover .octo-arm { animation: octocat-wave 560ms ease-in-out; }
@keyframes octocat-wave {
  0%, 100% { transform: rotate(0); }
  20%, 60% { transform: rotate(-25deg); }
  40%, 80% { transform: rotate(10deg); }
}

/* ===== Navigation Bar ===== */
.top-nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  position: sticky;
  top: 0;
  z-index: 5;
}
.top-nav .nav-logo {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.5px;
}
.top-nav .nav-logo span { color: var(--accent); }
.top-nav .nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}
.top-nav .nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  transition: color .2s;
}
.top-nav .nav-links a:hover { color: var(--accent); }

/* ===== Hero Section ===== */
.hero {
  text-align: center;
  padding: 80px 24px 64px;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(137,180,250,.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero h1 {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: 2px;
  position: relative;
}
.hero h1 span { color: var(--accent); }
.hero .tagline {
  font-size: 17px;
  color: var(--text-secondary);
  margin-top: 16px;
  line-height: 1.8;
  position: relative;
}
.hero .hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
  padding: 12px 32px;
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  transition: all .2s;
  position: relative;
}
.hero .hero-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(137,180,250,.3);
}

/* ===== Section ===== */
.section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 48px 24px;
}
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}
.section-header h2 {
  font-size: 20px;
  font-weight: 700;
}
.section-header .line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ===== Card Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all .25s;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  overflow: hidden;
}
.card:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,.35);
}
.card .card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card .icon {
  font-size: 28px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--bg-hover);
}
.card .badge {
  display: inline-block;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 500;
}
.badge-ready { background: rgba(166,227,161,.15); color: var(--green); }
.badge-soon { background: rgba(249,226,175,.12); color: var(--yellow); }
.card .card-title {
  font-size: 17px;
  font-weight: 600;
}
.card .card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Link List (for community section) ===== */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.link-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-primary);
  font-size: 14px;
  transition: all .2s;
}
.link-item:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
}
.link-item .link-icon {
  font-size: 18px;
  flex-shrink: 0;
}
.link-item .link-label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== Footer ===== */
.site-footer {
  text-align: center;
  padding: 40px 24px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}
.site-footer a {
  color: var(--accent);
  text-decoration: none;
}
.site-footer a:hover { text-decoration: underline; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero h1 { font-size: 28px; }
  .hero .tagline { font-size: 14px; }
  .top-nav { padding: 0 16px; }
  .top-nav .nav-links { gap: 16px; }
  .section { padding: 32px 16px; }
  .card-grid { grid-template-columns: 1fr; }
  .link-grid { grid-template-columns: 1fr; }
}