:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1a1f2e;
  --muted: #5a6270;
  --accent: #0066ff;
  --accent-light: #00d4ff;
  --border: #e2e8f0;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

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

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

/* Header */
.dbmap-header {
  background: #0a0f1c;
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
}
.logo img,
.logo svg { width: 34px; height: 34px; object-fit: contain; }
.logo span { white-space: nowrap; }
.dbmap-header nav {
  display: flex;
  gap: 24px;
}
.dbmap-header nav a {
  color: rgba(255,255,255,0.85);
  font-size: 0.95rem;
  white-space: nowrap;
}
.dbmap-header nav a:hover { color: var(--accent-light); text-decoration: none; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #0a0f1c 0%, #0d1b3a 100%);
  color: #fff;
  padding: 80px 0 90px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent-light);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  margin-bottom: 18px;
  border: 1px solid rgba(0, 212, 255, 0.25);
}
.hero h1 {
  font-size: 2.8rem;
  margin: 0 0 16px;
  font-weight: 700;
}
.hero p {
  max-width: 720px;
  margin: 0 auto 32px;
  color: rgba(255,255,255,0.75);
  font-size: 1.1rem;
}
.hero-search {
  display: flex;
  max-width: 680px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.25);
}
.hero-search input {
  flex: 1;
  border: none;
  padding: 18px 22px;
  font-size: 1rem;
  outline: none;
}
.hero-search button {
  border: none;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  color: #fff;
  padding: 0 30px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

/* Section */
.section { padding: 60px 0; }
.section h2 {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 36px;
}

/* Filter */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 28px;
}
.filter-btn {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all .2s;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}
.card {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.card-link {
  display: block;
  padding: 24px;
  color: var(--text);
}
.card-link:hover { text-decoration: none; }
.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-size: 0.8rem;
}
.card-category {
  color: var(--accent);
  font-weight: 600;
}
.card-level {
  color: var(--muted);
}
.card h2 {
  font-size: 1.15rem;
  margin: 0 0 10px;
  text-align: left;
}
.card p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag {
  background: #eef4ff;
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
}

/* Why */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.feature {
  background: #fff;
  padding: 26px;
  border-radius: 14px;
  box-shadow: var(--shadow);
}
.feature h3 { margin-top: 0; color: var(--accent); }
.feature p { color: var(--muted); margin-bottom: 0; }

/* Guide page */
.guide-page { padding: 40px 0 80px; }
.guide-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
}
.guide-sidebar { position: relative; }
.sticky-nav {
  position: sticky;
  top: 90px;
  background: #fff;
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.sticky-nav h3 { margin-top: 0; font-size: 1rem; }
.sticky-nav ul { list-style: none; padding: 0; margin: 0; }
.sticky-nav li { margin-bottom: 10px; }
.sticky-nav a { color: var(--muted); font-size: 0.92rem; }
.sticky-nav a:hover { color: var(--accent); }
.back-link {
  display: inline-block;
  margin-bottom: 18px;
  font-weight: 600;
}

.guide-content {
  background: #fff;
  border-radius: 16px;
  padding: 36px 42px;
  box-shadow: var(--shadow);
}
.guide-header { margin-bottom: 28px; border-bottom: 1px solid var(--border); padding-bottom: 24px; }
.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.85rem;
}
.guide-category {
  background: #eef4ff;
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 600;
}
.guide-level { color: var(--muted); }
.guide-date { color: var(--muted); }
.guide-content h1 {
  font-size: 2rem;
  margin: 0 0 12px;
}
.guide-summary {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 18px;
}
.official-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
}
.official-link:hover { text-decoration: none; opacity: 0.92; }

/* Markdown body */
.markdown-body { font-size: 1rem; }
.markdown-body h2 {
  font-size: 1.4rem;
  margin-top: 36px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.markdown-body h3 { font-size: 1.15rem; margin-top: 24px; }
.markdown-body p { margin: 0 0 14px; }
.markdown-body ul, .markdown-body ol { padding-left: 22px; margin-bottom: 16px; }
.markdown-body li { margin-bottom: 8px; }
.markdown-body code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: Consolas, Monaco, monospace;
  font-size: 0.9em;
}
.markdown-body pre {
  background: #0a0f1c;
  color: #e2e8f0;
  padding: 16px;
  border-radius: 10px;
  overflow-x: auto;
}
.markdown-body pre code { background: transparent; padding: 0; }
.markdown-body a { color: var(--accent); }
.markdown-body img { max-width: 100%; height: auto; border-radius: 8px; }
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}
.markdown-body th { background: #f8fafc; }

/* TOC generated by markdown extension */
.toc {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 28px;
}
.toc ul { list-style: none; padding-left: 0; margin: 0; }
.toc li { margin-bottom: 6px; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--accent); }

.guide-footer {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}

/* Search page */
.search-page { padding: 60px 0 80px; }
.search-page h1 { text-align: center; margin-bottom: 24px; }
.search-form {
  display: flex;
  max-width: 720px;
  margin: 0 auto 24px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.search-form input {
  flex: 1;
  border: none;
  padding: 16px 20px;
  font-size: 1rem;
  outline: none;
}
.search-form button {
  border: none;
  background: var(--accent);
  color: #fff;
  padding: 0 26px;
  font-weight: 600;
  cursor: pointer;
}
.search-status { text-align: center; color: var(--muted); margin-bottom: 18px; }
.results-list { max-width: 900px; margin: 0 auto; }
.result-item {
  background: #fff;
  border-radius: 12px;
  padding: 22px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.result-item h3 { margin: 0 0 8px; font-size: 1.15rem; }
.result-item p { margin: 0 0 8px; color: var(--muted); }
.result-meta { font-size: 0.8rem; color: var(--accent); font-weight: 600; }

/* Footer */
.dbmap-footer {
  background: #0a0f1c;
  color: rgba(255,255,255,0.6);
  padding: 32px 0;
  text-align: center;
  font-size: 0.9rem;
}
.dbmap-footer p { margin: 6px 0; }
.footer-links a { color: rgba(255,255,255,0.7); margin: 0 10px; }

/* Responsive */
@media (max-width: 900px) {
  .guide-layout { grid-template-columns: 1fr; }
  .guide-sidebar { display: none; }
  .guide-content { padding: 24px; }
}
@media (max-width: 640px) {
  .hero { padding: 50px 0 60px; }
  .hero h1 { font-size: 2rem; }
  .hero-search { flex-direction: column; border-radius: 12px; }
  .hero-search button { padding: 14px; }
  .header-inner nav { display: none; }
  .cards-grid { grid-template-columns: 1fr; }
}