/* ====================================
   国学天师·自学笔记
   水墨丹青 · Dark Chinese Theme
   ==================================== */

:root {
  --bg-primary: #0a0a14;
  --bg-secondary: #0f0f1e;
  --bg-card: #14142a;
  --bg-hover: #1a1a35;
  --bg-sidebar: #0d0d1a;
  --text-primary: #d4c5a9;
  --text-secondary: #a0907a;
  --text-muted: #6b5d4a;
  --accent-gold: #c9a84c;
  --accent-gold-dim: #8a7230;
  --accent-vermilion: #c23b22;
  --accent-jade: #5b8c5a;
  --accent-blue: #4a7fb5;
  --border: #1e1e38;
  --border-light: #2a2a4a;
  --shadow: rgba(0, 0, 0, 0.5);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.3s ease;
  --font-cn: "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", "Songti SC", serif;
  --font-body: -apple-system, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  --max-width: 800px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  min-height: 100vh;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-gold-dim); }

.app-wrapper {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: 280px;
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 100;
  padding: 0;
  transition: transform var(--transition);
}

.sidebar-header {
  padding: 28px 24px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-sidebar);
  z-index: 2;
}

.sidebar-header h1 {
  font-family: var(--font-cn);
  font-size: 1.3rem;
  color: var(--accent-gold);
  letter-spacing: 2px;
  font-weight: 700;
}

.sidebar-header .subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
  letter-spacing: 4px;
}

.sidebar-search {
  padding: 12px 16px;
  position: sticky;
  top: 98px;
  background: var(--bg-sidebar);
  z-index: 2;
  border-bottom: 1px solid var(--border);
}

.sidebar-search input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.82rem;
  outline: none;
  transition: border-color var(--transition);
}

.sidebar-search input:focus { border-color: var(--accent-gold-dim); }
.sidebar-search input::placeholder { color: var(--text-muted); }

.sidebar-nav { padding: 12px 0 40px; }
.nav-section { margin-bottom: 4px; }

.nav-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 3px;
  cursor: pointer;
  user-select: none;
  transition: color var(--transition);
}

.nav-section-title:hover { color: var(--text-secondary); }
.nav-section-title .arrow { font-size: 0.6rem; transition: transform 0.2s; }
.nav-section-title .arrow.collapsed { transform: rotate(-90deg); }

.nav-items { list-style: none; }
.nav-items.collapsed { display: none; }

.nav-item { position: relative; }

.nav-item a {
  display: block;
  padding: 6px 24px 6px 36px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}

.nav-item a:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-left-color: var(--accent-gold-dim);
}

.nav-item a.active {
  color: var(--accent-gold);
  border-left-color: var(--accent-gold);
  background: var(--bg-hover);
}

.nav-item .tag {
  display: inline-block;
  font-size: 0.6rem;
  padding: 1px 6px;
  border-radius: 3px;
  margin-left: 6px;
  vertical-align: middle;
}

.tag-yijing { background: rgba(201, 168, 76, 0.15); color: var(--accent-gold); }
.tag-qimen { background: rgba(194, 59, 34, 0.15); color: var(--accent-vermilion); }
.tag-wuyun { background: rgba(91, 140, 90, 0.15); color: var(--accent-jade); }
.tag-case { background: rgba(74, 127, 181, 0.15); color: var(--accent-blue); }
.tag-practice { background: rgba(201, 168, 76, 0.15); color: var(--accent-gold); }
.tag-xici { background: rgba(74, 127, 181, 0.15); color: var(--accent-blue); }
.tag-liuyao { background: rgba(74, 127, 181, 0.15); color: var(--accent-blue); }
.tag-meihua { background: rgba(91, 140, 90, 0.15); color: var(--accent-jade); }
.tag-united { background: rgba(194, 59, 34, 0.15); color: var(--accent-vermilion); }
.tag-liuyun { background: rgba(201, 168, 76, 0.15); color: var(--accent-gold); }

/* Main */
.main-content {
  margin-left: 280px;
  flex: 1;
  min-height: 100vh;
  padding: 0;
}

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.topbar .breadcrumb a { color: var(--text-muted); text-decoration: none; transition: color var(--transition); }
.topbar .breadcrumb a:hover { color: var(--accent-gold); }
.topbar .breadcrumb .sep { color: var(--border-light); }

.topbar .page-title {
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-align: right;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 300px;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1.1rem;
}

/* Page content */
.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 40px 80px;
}

/* Article */
.article { animation: fadeIn 0.4s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-header .category-badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.article-header h1 {
  font-family: var(--font-cn);
  font-size: 2rem;
  color: var(--text-primary);
  line-height: 1.4;
  font-weight: 700;
}

.article-header .day-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Markdown body */
.article-body { font-size: 0.95rem; }

.article-body h2 {
  font-family: var(--font-cn);
  font-size: 1.4rem;
  color: var(--accent-gold);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  scroll-margin-top: 72px;
}

.article-body h3 {
  font-family: var(--font-cn);
  font-size: 1.15rem;
  color: var(--text-primary);
  margin: 28px 0 12px;
  font-weight: 600;
  scroll-margin-top: 72px;
}

.article-body h4 {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 20px 0 10px;
  font-weight: 600;
}

.article-body p { margin: 12px 0; color: var(--text-primary); }
.article-body strong { color: var(--accent-gold); font-weight: 600; }
.article-body em { color: var(--text-secondary); font-style: italic; }

.article-body a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.article-body a:hover { border-bottom-color: var(--accent-blue); }

.article-body ul, .article-body ol { margin: 12px 0; padding-left: 24px; }
.article-body li { margin: 6px 0; }
.article-body li::marker { color: var(--accent-gold-dim); }

/* Tables */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.88rem;
  overflow-x: auto;
  display: block;
}

.article-body th, .article-body td {
  padding: 8px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

.article-body th {
  background: var(--bg-card);
  color: var(--accent-gold);
  font-weight: 600;
  font-size: 0.82rem;
}

.article-body td { color: var(--text-primary); }
.article-body tr:nth-child(even) td { background: rgba(20, 20, 42, 0.5); }

/* Code */
.article-body code {
  font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.82rem;
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-vermilion);
}

.article-body pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 16px 0;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.82rem;
  line-height: 1.6;
}

/* Blockquotes */
.article-body blockquote {
  border-left: 3px solid var(--accent-gold-dim);
  padding: 12px 20px;
  margin: 16px 0;
  background: rgba(201, 168, 76, 0.04);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-body hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-light), transparent);
  margin: 32px 0;
}

/* TOC */
.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 0 0 24px;
}

.toc-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 10px;
}

.toc ul { list-style: none; padding: 0; margin: 0; }
.toc li { margin: 4px 0; font-size: 0.85rem; }

.toc a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.toc a:hover { color: var(--accent-gold); }
.toc-h3 { padding-left: 16px; font-size: 0.82rem; }

/* Page prev/next */
.page-nav-wrap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.page-nav {
  display: inline-block;
  padding: 10px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: all var(--transition);
  max-width: 48%;
}

.page-nav:hover {
  border-color: var(--accent-gold-dim);
  color: var(--accent-gold);
  background: var(--bg-hover);
}

.page-nav.prev { margin-right: auto; }
.page-nav.next { margin-left: auto; }

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 99;
  transition: all var(--transition);
}

.back-to-top:hover {
  background: var(--bg-hover);
  border-color: var(--accent-gold-dim);
  color: var(--accent-gold);
}

.back-to-top.visible { display: flex; }

/* Homepage hero */
.hero {
  text-align: center;
  padding: 80px 20px 60px;
}

.hero .seal {
  font-size: 3rem;
  color: var(--accent-vermilion);
  margin-bottom: 16px;
  opacity: 0.8;
}

.hero h1 {
  font-family: var(--font-cn);
  font-size: 2.8rem;
  color: var(--accent-gold);
  letter-spacing: 6px;
  margin-bottom: 12px;
}

.hero .subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  letter-spacing: 8px;
  margin-bottom: 24px;
}

.hero .desc {
  max-width: 560px;
  margin: 0 auto;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.hero .divider {
  width: 60px;
  height: 2px;
  background: var(--accent-gold-dim);
  margin: 28px auto;
}

/* Category grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  max-width: 860px;
  margin: 0 auto 60px;
  padding: 0 20px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  opacity: 0;
  transition: opacity var(--transition);
}

.category-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--shadow);
}

.category-card:hover::before { opacity: 1; }

.category-card .icon { font-size: 1.8rem; margin-bottom: 12px; }
.category-card h3 { font-family: var(--font-cn); font-size: 1.1rem; margin-bottom: 8px; }
.category-card p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }
.category-card .count { font-size: 0.75rem; color: var(--text-muted); margin-top: 12px; }

.card-yijing h3 { color: var(--accent-gold); }
.card-yijing::before { background: var(--accent-gold); }
.card-qimen h3 { color: var(--accent-vermilion); }
.card-qimen::before { background: var(--accent-vermilion); }
.card-wuyun h3 { color: var(--accent-jade); }
.card-wuyun::before { background: var(--accent-jade); }
.card-case h3 { color: var(--accent-blue); }
.card-case::before { background: var(--accent-blue); }
.card-practice h3 { color: var(--accent-gold); }
.card-practice::before { background: var(--accent-gold); }
.card-xici h3 { color: var(--accent-blue); }
.card-xici::before { background: var(--accent-blue); }
.card-liuyao h3 { color: var(--accent-blue); }
.card-liuyao::before { background: var(--accent-blue); }
.card-meihua h3 { color: var(--accent-jade); }
.card-meihua::before { background: var(--accent-jade); }
.card-united h3 { color: var(--accent-vermilion); }
.card-united::before { background: var(--accent-vermilion); }
.card-liuyun h3 { color: var(--accent-blue); }
.card-liuyun::before { background: var(--accent-blue); }

/* Recent entries */
.recent-section {
  max-width: 860px;
  margin: 0 auto 60px;
  padding: 0 20px;
}

.recent-section h2 {
  font-family: var(--font-cn);
  font-size: 1.2rem;
  color: var(--accent-gold);
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.recent-list { list-style: none; }

.recent-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: var(--radius);
  transition: background var(--transition);
}

.recent-list li:hover { background: var(--bg-hover); }
.recent-list .dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }

.recent-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  flex: 1;
  transition: color var(--transition);
}

.recent-list a:hover { color: var(--text-primary); }
.recent-list .meta { font-size: 0.7rem; color: var(--text-muted); flex-shrink: 0; }

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content { margin-left: 0; }
  .menu-toggle { display: block; }
  .topbar { padding: 0 20px; }
  .topbar .page-title { max-width: 180px; }
  .page-content { padding: 20px 20px 60px; }
  .hero h1 { font-size: 2rem; }
  .article-header h1 { font-size: 1.5rem; }
  .category-grid { grid-template-columns: 1fr; }
}