```css
/* =========================================
   妖精漫画 - 完整样式系统
   奇幻·冒险·恋爱 | 多元风格
   ========================================= */

/* ---------- CSS 变量与主题令牌 ---------- */
:root {
  /* 主色板 - 妖精森林幻想系 */
  --primary: #2c3e50;
  --primary-light: #5f7d9c;
  --primary-dark: #1e2b38;
  --accent: #f1c40f;
  --accent-secondary: #e67e22;
  --magic-purple: #8e44ad;
  --magic-purple-light: #a569bd;
  --fairy-teal: #16a085;
  --fairy-teal-light: #48c9b0;

  /* 中性色 - 高对比度可读性 */
  --bg: #f9fafc;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --surface-hover: #f0f4f8;
  --text-primary: #1f2937;
  --text-secondary: #243447;
  --text-muted: #4b5a6a;
  --text-inverse: #ffffff;
  --border: #d1d5db;
  --border-light: #e5e7eb;

  /* 阴影与毛玻璃 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.4);

  /* 布局 */
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 48px;

  /* 动画 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* 暗黑模式覆盖令牌 */
body.dark {
  --bg: #12181f;
  --bg-alt: #1e293b;
  --surface: #1f2937;
  --surface-hover: #2d3a4a;
  --text-primary: #e2e8f0;
  --text-secondary: #d1d5db;
  --text-muted: #cbd5e1;
  --text-inverse: #f8fafc;
  --border: #334155;
  --border-light: #2d3a4a;
  --glass-bg: rgba(30, 41, 59, 0.72);
  --glass-border: rgba(148, 163, 184, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
}

/* ---------- Reset & 基础 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  transition: background-color var(--transition-base), color var(--transition-base);
  min-height: 100vh;
  overflow-x: hidden;
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-alt);
  border-radius: var(--radius-pill);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: var(--radius-pill);
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

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

/* ---------- 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  letter-spacing: -0.02em;
  transition: color var(--transition-base);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  margin-bottom: 0.5em;
  background: linear-gradient(120deg, var(--primary), var(--magic-purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  margin: 2.5rem 0 1.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--accent), var(--magic-purple)) 1;
  border-bottom-style: solid;
  position: relative;
}

h2::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  border-radius: var(--radius-pill);
}

h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  margin: 2rem 0 1rem;
  color: var(--text-primary);
}

h4 {
  font-size: clamp(1rem, 2vw, 1.2rem);
  margin: 1.2rem 0 0.6rem;
  font-weight: 600;
}

p {
  margin-bottom: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  font-weight: 500;
}

a:hover {
  color: var(--magic-purple);
  border-bottom-color: currentColor;
}

body.dark a {
  color: #7dd3fc;
}

body.dark a:hover {
  color: #bae6fd;
}

ul, ol {
  margin: 0 0 1.5rem 1.5rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.5rem;
}

strong {
  font-weight: 700;
  color: var(--text-primary);
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
}

/* ---------- 布局容器 ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
  width: 100%;
}

/* ---------- 按钮通用 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--magic-purple));
  color: var(--text-inverse);
  padding: 0.8rem 2rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-base);
  box-shadow: 0 4px 16px rgba(139, 69, 19, 0.2);
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(139, 69, 19, 0.3);
  background: linear-gradient(135deg, var(--magic-purple), var(--primary));
  color: var(--text-inverse);
}

.btn:hover::before {
  left: 100%;
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

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

body.dark .btn {
  background: linear-gradient(135deg, var(--primary-light), var(--magic-purple-light));
  color: #fff;
}

body.dark .btn:hover {
  background: linear-gradient(135deg, var(--magic-purple-light), var(--primary-light));
}

/* ---------- 导航栏 ---------- */
.site-header {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background var(--transition-base), box-shadow var(--transition-base);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

body.dark .site-header {
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom-color: rgba(51, 65, 85, 0.3);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1rem, 3vw, 2rem);
  min-height: 72px;
  gap: 1rem;
  position: relative;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--magic-purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo::before {
  content: "🧚";
  font-size: 1.8rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.nav-menu {
  display: flex;
  gap: 0.5rem;
  background: transparent;
  align-items: center;
}

.nav-menu a {
  font-weight: 500;
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  border-bottom: none;
  transition: background var(--transition-fast), color var(--transition-fast);
  position: relative;
}

.nav-menu a:hover {
  background: rgba(139, 69, 19, 0.08);
  color: var(--magic-purple);
  border-bottom: none;
}

body.dark .nav-menu a {
  color: var(--text-primary);
}

body.dark .nav-menu a:hover {
  background: rgba(125, 211, 252, 0.1);
  color: #7dd3fc;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 0.2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--magic-purple));
  border-radius: var(--radius-pill);
  transition: width var(--transition-fast);
}

.nav-menu a:hover::after {
  width: 60%;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.5rem 0.35rem 1rem;
  border: 1px solid var(--border-light);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: clamp(160px, 20vw, 220px);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(241, 196, 15, 0.2);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.4rem 0;
  font-size: 0.9rem;
  color: var(--text-primary);
  outline: none;
  width: 100%;
}

.search-box input::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.search-box button {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border: none;
  cursor: pointer;
  color: var(--primary-dark);
  font-size: 0.9rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.search-box button:hover {
  transform: scale(1.1);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text-primary);
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
  line-height: 1;
}

.menu-toggle:hover {
  background: var(--bg-alt);
}

/* 移动端导航 */
@media (max-width: 768px) {
  .nav-wrap {
    flex-wrap: wrap;
    padding: 0.5rem 1rem;
    min-height: 60px;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    position: absolute;
    top: 100%;
    left: 0;
    padding: 1rem;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    border-bottom: 1px solid var(--glass-border);
  }

  .nav-menu.active {
    display: flex;
    animation: slideDown 0.3s ease;
  }

  .nav-menu a {
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
  }

  .nav-menu a::after {
    display: none;
  }

  .menu-toggle {
    display: block;
    order: 3;
  }

  .search-box {
    order: 2;
    width: calc(100% - 60px);
    margin-left: auto;
  }

  .logo {
    font-size: 1.3rem;
    order: 1;
  }

  .logo::before {
    font-size: 1.4rem;
  }
}

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

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 1.2rem 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--primary-light);
  font-weight: 500;
}

.breadcrumb a:hover {
  color: var(--magic-purple);
}

.breadcrumb span {
  font-weight: 400;
}

.breadcrumb .separator {
  opacity: 0.5;
}

/* ---------- Hero Banner ---------- */
.hero-banner {
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(241, 196, 15, 0.12), transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(142, 68, 173, 0.15), transparent 50%),
    linear-gradient(135deg, var(--bg-alt), var(--surface));
  padding: clamp(3rem, 8vw, 5rem) 0;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  position: relative;
  overflow: hidden;
  transition: background var(--transition-base);
  border-bottom: 1px solid var(--border-light);
}

.hero-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(142, 68, 173, 0.15), transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

.hero-banner::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(241, 196, 15, 0.1), transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

body.dark .hero-banner {
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(142, 68, 173, 0.2), transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(241, 196, 15, 0.1), transparent 50%),
    linear-gradient(135deg, #0f172a, #1e293b);
}

.hero-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(1.5rem, 5vw, 3rem);
  position: relative;
  z-index: 1;
}

.hero-text {
  flex: 1 1 400px;
  min-width: 280px;
}

.hero-text h1 {
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  margin-bottom: 0.3em;
  line-height: 1.1;
}

.hero-text p {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  margin-top: 0.8rem;
  color: var(--text-secondary);
  max-width: 600px;
}

.hero-text .btn {
  margin-top: 1.5rem;
  font-size: 1.1rem;
  padding: 0.9rem 2.5rem;
}

.hero-svg {
  flex: 0 1 300px;
  min-width: 200px;
  text-align: center;
  animation: heroFloat 6s ease-in-out infinite;
}

@keyframes heroFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

.hero-svg svg {
  filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.15));
  width: 100%;
  height: auto;
}

/* ---------- 卡片通用 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: clamp(1rem, 3vw, 1.8rem);
  margin: 2rem 0;
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  border-radius: var(--radius-lg);
  padding: clamp(1.2rem, 3vw, 2rem);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--magic-purple));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  background: var(--surface);
}

.card:hover::before {
  transform: scaleX(1);
}

body.dark .card {
  background: rgba(31, 41, 55, 0.8);
  border-color: rgba(148, 163, 184, 0.2);
}

body.dark .card:hover {
  background: var(--surface);
}

.card h3 {
  margin-top: 0;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card h3::before {
  font-size: 1.5rem;
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
}

.card .emoji-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.card:nth-child(1) h3::before { content: "🐉"; }
.card:nth-child(2) h3::before { content: "💖"; }
.card:nth-child(3) h3::before { content: "😄"; }
.card:nth-child(4) h3::before { content: "🌑"; }

/* ---------- 文章卡片 ---------- */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: clamp(1rem, 2.5vw, 1.5rem);
  margin: 2rem 0;
}

.article-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px) saturate(160%);
  -webkit-backdrop-filter: blur(10px) saturate(160%);
  border-radius: var(--radius-md);
  padding: clamp(1.2rem, 2.5vw, 1.8rem);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-md);
}

.article-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.8rem;
  transition: color var(--transition-fast);
}

.article-card:hover h3 {
  color: var(--magic-purple);
}

.article-card .meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-card .meta::before {
  content: "📅";
  font-size: 0.9rem;
}

.article-card p {
  flex-grow: 1;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.article-card a {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.article-card a::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.article-card a:hover::after {
  transform: translateX(4px);
}

body.dark .article-card {
  background: rgba(31, 41, 55, 0.8);
}

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  padding: 0;
  margin-bottom: 1rem;
  border-left: 4px solid var(--primary);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  overflow: hidden;
  border: 1px solid var(--glass-border);
}

.faq-item:hover {
  border-left-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  color: var(--text-primary);
  transition: background var(--transition-fast);
  gap: 1rem;
  user-select: none;
}

.faq-question:hover {
  background: rgba(0, 0, 0, 0.02);
}

body.dark .faq-question:hover {
  background: rgba(255, 255, 255, 0.03);
}

.faq-question .icon {
  font-size: 1.3rem;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-alt);
  border-radius: 50%;
  transition: transform var(--transition-base), background var(--transition-base);
  flex-shrink: 0;
  color: var(--primary);
}

.faq-item.active .faq-question .icon {
  transform: rotate(45deg);
  background: var(--accent);
  color: var(--primary-dark);
}

.faq-answer {
  padding: 0 1.5rem 1.2rem;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* ---------- 表格 ---------- */
.info-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.info-table th,
.info-table td {
  border: 1px solid var(--border-light);
  padding: 0.9rem 1.2rem;
  text-align: left;
}

.info-table th {
  background: var(--bg-alt);
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.info-table tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

.info-table tr:hover {
  background: rgba(139, 69, 19, 0.04);
}

body.dark .info-table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

/* ---------- 统计数字 ---------- */
.stat-num {
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--primary);
  background: linear-gradient(135deg, var(--primary), var(--magic-purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  line-height: 1.2;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

/* ---------- 图片占位 ---------- */
.svg-placeholder {
  background: linear-gradient(135deg, var(--bg-alt), var(--surface));
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
  border: 1px dashed var(--border);
  transition: background var(--transition-base);
}

body.dark .svg-placeholder {
  background: var(--surface);
}

/* ---------- 章节间距 ---------- */
section {
  margin-bottom: 3rem;
  scroll-margin-top: 90px;
}

section > h2:first-child {
  margin-top: 1.5rem;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  padding: clamp(2rem, 5vw, 4rem) 0 1rem;
  margin-top: 5rem;
  border-top: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--magic-purple), var(--fairy-teal));
}

body.dark .site-footer {
  background: rgba(15, 23, 42, 0.8);
  border-top-color: var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: 2rem;
}

.footer-grid h4 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-grid h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--magic-purple));
  border-radius: var(--radius-pill);
}

.footer-grid a {
  color: var(--text-secondary);
  display: block;
  margin: 0.4rem 0;
  border-bottom: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
  padding: 0.2rem 0;
}

.footer-grid a:hover {
  color: var(--magic-purple);
  transform: translateX(4px);
  border-bottom: none;
}

body.dark .footer-grid a {
  color: var(--text-muted);
}

body.dark .footer-grid a:hover {
  color: #7dd3fc;
}

.footer-bottom {
  text-align: center;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--border-light);
  margin-top: 1rem;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.footer-bottom a {
  color: var(--text-muted);
}

body.dark .footer-bottom {
  border-top-color: var(--border);
}

/* ---------- 悬浮按钮 ---------- */
.backtop,
.dark-toggle {
  position: fixed;
  bottom: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  z-index: 200;
  opacity: 0.9;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--primary), var(--magic-purple));
  color: white;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.backtop {
  right: 30px;
}

.dark-toggle {
  right: 90px;
  background: linear-gradient(135deg, var(--primary-light), var(--fairy-teal));
}

.backtop:hover,
.dark-toggle:hover {
  opacity: 1;
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

.backtop:active,
.dark-toggle:active {
  transform: scale(0.95);
}

body.dark .backtop,
body.dark .dark-toggle {
  color: var(--text-inverse);
}

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 交错动画 */
.card-grid .card:nth-child(2),
.article-list .article-card:nth-child(2) {
  transition-delay: 0.1s;
}

.card-grid .card:nth-child(3),
.article-list .article-card:nth-child(3) {
  transition-delay: 0.2s;
}

.card-grid .card:nth-child(4),
.article-list .article-card:nth-child(4) {
  transition-delay: 0.3s;
}

/* ---------- 工具类 ---------- */
.text-muted,
.meta,
.desc,
small {
  color: var(--text-muted);
}

.opacity-low {
  opacity: 1;
}

.text-center {
  text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* ---------- 响应式细节 ---------- */
@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  .hero-banner {
    padding: 2.5rem 0;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }

  .hero-text {
    text-align: center;
  }

  .hero-text p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-svg {
    margin-top: 1rem;
  }

  .hero-svg svg {
    max-width: 200px;
  }

  .btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.95rem;
  }

  .card-grid,
  .article-list {
    grid-template-columns: 1fr;
  }

  .backtop,
  .dark-toggle {
    width: 40px;
    height: 40px;
    font-size: 1rem;
    bottom: 20px;
  }

  .backtop {
    right: 20px;
  }

  .dark-toggle {
    right: 70px;
  }

  .faq-question {
    font-size: 0.95rem;
    padding: 0.9rem 1rem;
  }

  .faq-answer {
    padding: 0 1rem 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .search-box {
    width: 100%;
  }

  .nav-wrap {
    gap: 0.5rem;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .site-header,
  .hero-banner,
  .backtop,
  .dark-toggle,
  .menu-toggle,
  .search-box,
  footer .footer-grid {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .container {
    max-width: 100%;
  }

  a {
    color: black;
    text-decoration: underline;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 焦点可见性 */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* 暗色模式下的微调 */
body.dark .logo {
  background: linear-gradient(135deg, #fff, #7dd3fc);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

body.dark .stat-num {
  background: linear-gradient(135deg, #7dd3fc, #a569bd);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 主题装饰 */
.theme-sparkle {
  position: relative;
}

.theme-sparkle::after {
  content: "✨";
  position: absolute;
  font-size: 1.2rem;
  animation: twinkle 2s infinite;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.2); }
}
```