/* ============================================================
   Eco Organic Theme — Skeuomorphic + Environmental
   环保主义 · 拟物质感 · 有机生命
   ============================================================ */

/* ── Google Fonts: Playfair Display (heading) + Source Sans 3 (body) ── */

/* ============================================================
   1. CSS Custom Properties — Dark Mode (Forest Night)
   ============================================================ */

:root,
[data-theme="dark"] {
  /* ── 背景色系：深夜森林 ── */
  --bg-base:      #0f1a12;      /* 深林底色 */
  --bg-surface:   #1a2e1f;     /* 苔藓表层 */
  --bg-elevated:  #243828;     /* 草地层级 */
  --bg-hover:     #2d4431;     /* 悬停提亮 */
  --bg-card:      #1e2e22;     /* 卡片底色 */

  /* ── 边框色 ── */
  --border:       #354d3a;     /* 暗枝干 */
  --border-focus: #7cb87f;     /* 新叶绿 */

  /* ── 强调色：森林主调 ── */
  --accent:       #5fa55f;     /* 森林绿 */
  --accent-light: #8fcc8f;    /* 嫩叶绿 */
  --accent-dark:  #3d7a3d;    /* 深林绿 */
  --accent-dim:   rgba(95, 165, 95, 0.15);
  --accent2:      #d4a574;    /* 树皮棕 */
  --accent2-dim:  rgba(212, 165, 116, 0.12);

  /* ── 文字色 ── */
  --text-primary:   #e8efe4;   /* 晨雾白 */
  --text-secondary: #a8b8a8;   /* 灰苔藓 */
  --text-muted:     #6a7a6a;   /* 深灰苔 */
  --text-inverse:   #0f1a12;

  /* ── 阴影：自然层次 ── */
  --shadow-sm:    0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md:    0 6px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg:    0 12px 48px rgba(0, 0, 0, 0.6);
  --shadow-card:  0 4px 16px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.2);

  /* ── 拟物圆角 ── */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;

  /* ── 拟物质感 ── */
  --texture-opacity: 0.03;
  --grain-url: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");

  /* ── 过渡 ── */
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   2. CSS Custom Properties — Light Mode (Morning Meadow)
   ============================================================ */

[data-theme="light"] {
  /* ── 背景色系：清晨草地 ── */
  --bg-base:      #f4f7f2;     /* 晨雾底色 */
  --bg-surface:   #ffffff;     /* 纯白表层 */
  --bg-elevated:  #edf3ea;     /* 嫩芽层 */
  --bg-hover:     #e5efe3;     /* 轻拂绿 */
  --bg-card:      #ffffff;     /* 卡片底色 */

  /* ── 边框色 ── */
  --border:       #c8d9c8;     /* 浅草绿 */
  --border-focus: #3d7a3d;     /* 深林绿 */

  /* ── 强调色 ── */
  --accent:       #3d7a3d;     /* 森林绿 */
  --accent-light: #5fa55f;     /* 明亮绿 */
  --accent-dark:  #2d5a2d;     /* 深邃绿 */
  --accent-dim:   rgba(61, 122, 61, 0.1);
  --accent2:      #c49a6c;    /* 树皮棕 */
  --accent2-dim:  rgba(196, 154, 108, 0.12);

  /* ── 文字色 ── */
  --text-primary:   #1a2e1a;   /* 深林墨 */
  --text-secondary: #4a5e4a;   /* 苔藓灰 */
  --text-muted:     #8a9a8a;   /* 远山灰 */
  --text-inverse:   #ffffff;

  /* ── 阴影：柔和自然 ── */
  --shadow-sm:    0 2px 6px rgba(61, 122, 61, 0.08);
  --shadow-md:    0 6px 20px rgba(61, 122, 61, 0.12);
  --shadow-lg:    0 12px 40px rgba(61, 122, 61, 0.15);
  --shadow-card:  0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

/* ============================================================
   3. Reset & Base
   ============================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  color-scheme: dark light;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: 'Source Sans 3', 'Noto Sans SC', 'PingFang SC', sans-serif;
  font-size: 1rem;
  line-height: 1.8;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
  position: relative;
}

/* 自然纹理覆盖层 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--grain-url);
  opacity: var(--texture-opacity);
  pointer-events: none;
  z-index: 0;
}

/* No transition on first load */
body.no-transition * {
  transition: none !important;
}

img   { max-width: 100%; display: block; }
a     { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ============================================================
   4. Typography Scale
   ============================================================ */

:is(h1, h2, h3, h4, h5, h6) {
  font-family: 'Playfair Display', 'Noto Serif SC', 'PingFang SC', serif;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  line-height: 1.3;
}

/* ============================================================
   5. Layout Scaffold
   ============================================================ */

.site-wrapper {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 2rem);
}

/* ============================================================
   6. Header & Navigation
   ============================================================ */

.site-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
  /* 拟物：顶部微妙阴影 */
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .site-header {
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
}

.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 1rem;
}

/* Logo — 有机形态 */
.site-logo {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  transition: color var(--transition-smooth), transform var(--transition-smooth);
  /* 拟物：文字阴影 */
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.site-logo:hover {
  color: var(--accent-light);
  transform: translateY(-1px);
}

[data-theme="light"] .site-logo {
  text-shadow: none;
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.nav-links a {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
  cursor: pointer;
  transition: color var(--transition-smooth);
  border-radius: var(--radius-sm);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 3px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 2px;
  transition: transform var(--transition-smooth);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--accent);
}

.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  transform: translateX(-50%) scaleX(1);
}

/* Theme Toggle — 拟物按钮 */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0;
  transition: all var(--transition-smooth);
  flex-shrink: 0;
  /* 拟物：凸起效果 */
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.theme-toggle:active {
  transform: translateY(0);
  box-shadow: var(--shadow-inset);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  pointer-events: none;
  transition: transform var(--transition-smooth);
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

/* Sun icon — shown in dark mode */
.icon-sun  { display: block; }
.icon-moon { display: none; }

[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ============================================================
   7. Reading Progress Bar
   ============================================================ */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--accent));
  z-index: 9999;
  width: 0%;
  transition: width 0.1s linear;
  pointer-events: none;
  /* 拟物：发光效果 */
  box-shadow: 0 0 10px var(--accent), 0 0 20px var(--accent-dim);
}

/* ============================================================
   8. Hero Section
   ============================================================ */

.hero {
  padding: clamp(3.5rem, 10vw, 6rem) 0 clamp(3rem, 8vw, 5rem);
  position: relative;
  overflow: hidden;
}

/* 背景装饰：有机圆形 */
.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
  border-radius: 50%;
  opacity: 0.6;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50px;
  left: -50px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--accent2-dim) 0%, transparent 70%);
  border-radius: 50%;
  opacity: 0.4;
  pointer-events: none;
}

.hero-content { position: relative; z-index: 1; }

.hero-label {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 1px;
}

.hero-title {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  /* 拟物：微妙阴影 */
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .hero-title {
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-title .accent {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

/* CTA — 拟物按钮：渐变 + 阴影 + 圆角 */
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border: none;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: #ffffff;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--transition-smooth);
  /* 拟物：凸起效果 */
  box-shadow: 0 4px 16px rgba(95, 165, 95, 0.3), 0 2px 4px rgba(0, 0, 0, 0.1);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.hero-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(95, 165, 95, 0.4), 0 4px 8px rgba(0, 0, 0, 0.15);
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
}

.hero-cta:active {
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(95, 165, 95, 0.3);
}

/* ============================================================
   9. Section Label
   ============================================================ */

.section-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-label span {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--border), transparent);
  border-radius: 1px;
}

/* ============================================================
   10. Post List — Index (拟物卡片)
   ============================================================ */

.posts-section { padding: clamp(2rem, 6vw, 4rem) 0; }

.post-list { display: grid; gap: 1.25rem; }

.post-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: start;
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  position: relative;
  transition: all var(--transition-smooth);
  /* 拟物：卡片阴影 */
  box-shadow: var(--shadow-card);
}

.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md), 0 0 0 1px var(--accent-dim);
}

/* Focus-within */
.post-card:focus-within {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md), 0 0 0 2px var(--accent-dim);
}

/* Tags — 有机胶囊 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-smooth);
}

.tag:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.post-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.post-card-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.4;
  transition: color var(--transition-smooth);
}

.post-card:hover .post-card-title { color: var(--accent); }

.post-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.post-card-meta {
  text-align: right;
  flex-shrink: 0;
  padding-top: 4px;
}

.post-date {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 0.75rem;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition-smooth);
}

.post-card:hover .read-more {
  opacity: 1;
  transform: translateX(0);
}

.read-more svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-smooth);
}

.post-card:hover .read-more svg {
  transform: translateX(3px);
}

/* ============================================================
   11. Single Post
   ============================================================ */

.post-header {
  padding: clamp(2.5rem, 8vw, 5rem) 0 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}

.post-header-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.post-category {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.post-header-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.post-header-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.75;
}

/* ============================================================
   12. Article Content
   ============================================================ */

.post-content {
  max-width: 700px;
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.post-content h2,
.post-content h3,
.post-content h4 {
  color: var(--text-primary);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.post-content h2 {
  font-size: 1.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-dim);
}

.post-content h3 { font-size: 1.25rem; }

.post-content p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

.post-content ul,
.post-content ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.post-content ul { list-style: disc; }
.post-content ol { list-style: decimal; }

.post-content li { margin-bottom: 0.5rem; }

.post-content blockquote {
  position: relative;
  padding: 1.25rem 1.5rem 1.25rem 2rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent);
  margin: 2rem 0;
  font-style: italic;
  color: var(--text-secondary);
  /* 拟物：内阴影 */
  box-shadow: var(--shadow-inset);
}

.post-content blockquote::before {
  content: '"';
  position: absolute;
  top: -8px;
  left: 12px;
  font-family: 'Playfair Display', serif;
  font-size: 3rem;
  color: var(--accent);
  opacity: 0.3;
  line-height: 1;
}

.post-content code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.875em;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  color: var(--accent2);
}

.post-content pre {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 2rem 0;
  /* 拟物：卡片阴影 */
  box-shadow: var(--shadow-card);
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-dim);
  text-underline-offset: 3px;
  transition: all var(--transition-smooth);
}

.post-content a:hover {
  text-decoration-color: var(--accent);
}

.post-content hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-dim), var(--border), transparent);
  margin: 2.5rem 0;
  border-radius: 1px;
}

/* Table */
.post-content table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 2rem 0;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.post-content th {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--bg-elevated);
  padding: 12px 16px;
  text-align: left;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

.post-content td {
  padding: 12px 16px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.post-content tr:last-child td {
  border-bottom: none;
}

/* ============================================================
   13. Post Navigation
   ============================================================ */

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}

.post-nav-item {
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-card);
}

.post-nav-item:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.post-nav-item.next { text-align: right; }

.post-nav-label {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.post-nav-title {
  font-family: 'Playfair Display', serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

/* ============================================================
   14. Taxonomy
   ============================================================ */

.taxonomy-section { padding: clamp(2rem, 6vw, 4rem) 0; }

.taxonomy-grid { display: flex; flex-wrap: wrap; gap: 10px; }

.taxonomy-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 25px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}

.taxonomy-item:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.taxonomy-count {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--bg-elevated);
  color: var(--text-muted);
}

/* ============================================================
   15. About Page
   ============================================================ */

.about-section {
  padding: clamp(2rem, 6vw, 4rem) 0;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: clamp(2rem, 6vw, 4rem);
  align-items: start;
}

.stat-block {
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  margin-bottom: 1.25rem;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-card);
}

.stat-block:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.stat-label {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.stat-value {
  font-family: 'Playfair Display', serif;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

/* ============================================================
   16. Footer
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  background: var(--bg-surface);
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-smooth);
}

.footer-links a:hover { color: var(--accent); }

/* ============================================================
   17. Pagination
   ============================================================ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 3rem 0;
}

.page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-card);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}

.page-btn:hover,
.page-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ============================================================
   18. 404 Error Page
   ============================================================ */

.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.error-code {
  font-family: 'Playfair Display', serif;
  font-size: clamp(5rem, 18vw, 12rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--border);
  line-height: 1;
  margin-bottom: 1.5rem;
  /* 拟物：渐变文字 */
  background: linear-gradient(180deg, var(--text-muted) 0%, var(--border) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.error-msg {
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* ============================================================
   19. About Page
   ============================================================ */

.about-header {
  text-align: center;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: 3rem;
  /* 拟物：渐变底边装饰 */
  background: linear-gradient(180deg, var(--bg-base) 0%, transparent 100%);
}

.about-header .post-header-meta {
  justify-content: center;
  margin-bottom: 1.5rem;
}

.about-header .post-header-title {
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  margin-bottom: 0.75rem;
  /* 拟物：文字阴影 */
  text-shadow: 0 2px 4px var(--shadow-color);
}

.about-header .post-header-subtitle {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.05em;
}

.about-header .post-content {
  max-width: 720px;
  margin: 0 auto;
}

/* 关于页面 h2 样式 */
.about-header + .post-content h2 {
  font-size: 1.4rem;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.about-header + .post-content h2:first-of-type {
  margin-top: 0;
}

/* 关于页面列表项特色 */
.about-header + .post-content li {
  position: relative;
  padding-left: 1.5rem;
}

.about-header + .post-content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

/* 关于页面表格更圆润 */
.post-content.about-table table {
  border-radius: var(--radius-lg);
}

/* ============================================================
   20. Utility Classes
   ============================================================ */

.accent-text { color: var(--accent); }
.muted { color: var(--text-muted); }
.surface { background: var(--bg-surface); }

/* ============================================================
   20. Focus & Accessibility
   ============================================================ */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: #ffffff;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
  box-shadow: var(--shadow-md);
}

.skip-link:focus { top: 1rem; }

/* ============================================================
   21. Responsive
   ============================================================ */

@media (max-width: 768px) {
  .about-section {
    grid-template-columns: 1fr;
  }
  .post-nav {
    grid-template-columns: 1fr;
  }
  .post-card {
    grid-template-columns: 1fr;
  }
  .post-card-meta { text-align: left; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.85rem; }
}

@media (max-width: 480px) {
  .nav-links {
    display: none;
  }
}

/* ============================================================
   22. Reduced Motion
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   23. Scrollbar
   ============================================================ */

::-webkit-scrollbar          { width: 8px; height: 8px; }
::-webkit-scrollbar-track    { background: var(--bg-base); }
::-webkit-scrollbar-thumb    { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================================
   24. Selection
   ============================================================ */

::selection {
  background: var(--accent-dim);
  color: var(--accent);
}