:root {
  --bg: #f4f6fd;
  --bg-gradient: linear-gradient(135deg, #eef2ff 0%, #f8f9fc 50%, #fdf2ff 100%);
  --surface: rgba(255, 255, 255, 0.78);
  --surface-solid: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.6);
  --text: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8a8aa3;
  --primary: #4a6cf7;
  --primary-dark: #3b5bdb;
  --primary-light: #7b93ff;
  --accent: #a855f7;
  --accent-pink: #ec4899;
  --gradient-primary: linear-gradient(135deg, #4a6cf7 0%, #7b93ff 50%, #a855f7 100%);
  --gradient-hero: linear-gradient(135deg, #eef2ff 0%, #f5f0ff 40%, #fdf2ff 100%);
  --gradient-banner: linear-gradient(120deg, #4a6cf7 0%, #7b5cf7 50%, #a855f7 100%);
  --border: rgba(226, 232, 240, 0.8);
  --border-solid: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(74, 108, 247, 0.06);
  --shadow: 0 6px 24px rgba(74, 108, 247, 0.08);
  --shadow-lg: 0 12px 40px rgba(74, 108, 247, 0.14);
  --shadow-glow: 0 8px 32px rgba(74, 108, 247, 0.28);
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --blur: 16px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.18s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
  text-decoration: none;
}

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

ul,
ol {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--text-secondary);
}

li {
  margin-bottom: 6px;
}

p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

h2 {
  font-size: 1.85rem;
  font-weight: 800;
  margin-bottom: 28px;
  position: relative;
  padding-left: 20px;
  letter-spacing: -0.02em;
  color: var(--text);
}

h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 6px;
  background: var(--gradient-primary);
  border-radius: 4px;
  box-shadow: 0 0 16px rgba(74, 108, 247, 0.4);
}

h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 26px 0 14px;
  color: var(--text);
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 18px 0 10px;
  color: var(--text-secondary);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  box-shadow: var(--shadow-glow);
  z-index: 999;
  transition: transform var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 12px 40px rgba(74, 108, 247, 0.5);
  color: #fff;
}

/* ===== 头部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--surface-glass);
  backdrop-filter: blur(var(--blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  transition: transform var(--transition);
}

.logo:hover {
  transform: scale(1.03);
}

.logo svg {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(74, 108, 247, 0.35);
  transition: box-shadow var(--transition), transform var(--transition);
}

.logo:hover svg {
  box-shadow: 0 6px 24px rgba(74, 108, 247, 0.5);
  transform: rotate(-4deg);
}

.main-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.main-nav a {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.main-nav a:hover {
  color: var(--primary);
  background: rgba(74, 108, 247, 0.08);
  border-color: rgba(74, 108, 247, 0.15);
  transform: translateY(-1px);
}

.search-box {
  display: flex;
  gap: 8px;
  align-items: center;
}

.search-box input {
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  width: 190px;
  outline: none;
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text);
  transition: all var(--transition);
}

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

.search-box input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(74, 108, 247, 0.12);
  width: 220px;
  background: var(--surface-solid);
}

.search-box button {
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  padding: 9px 20px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 14px rgba(74, 108, 247, 0.3);
}

.search-box button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74, 108, 247, 0.45);
}

.search-box button:active {
  transform: translateY(0);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 18px 0 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

/* ===== Hero 首屏 ===== */
.hero {
  padding: 56px 0 48px;
  background: var(--gradient-hero);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -80px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(74, 108, 247, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatBlob 12s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -140px;
  left: -60px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.14) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatBlob 15s ease-in-out infinite reverse;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

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

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 18px;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #1a1a2e 0%, #4a6cf7 60%, #a855f7 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.7s ease forwards;
}

.hero .lead {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin-bottom: 26px;
  animation: fadeInUp 0.7s ease 0.1s forwards;
  opacity: 0;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  animation: fadeInUp 0.7s ease 0.2s forwards;
  opacity: 0;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 13px 32px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition);
  border: 2px solid transparent;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 6px 22px rgba(74, 108, 247, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(74, 108, 247, 0.5);
  color: #fff;
}

.btn-outline {
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(74, 108, 247, 0.35);
}

/* ===== 锚点导航 ===== */
.anchor-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 24px 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.anchor-nav a {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 14px;
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.anchor-nav a:hover {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(74, 108, 247, 0.3);
}

/* ===== Banner 轮播 ===== */
.banner-slider {
  margin: 32px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition), box-shadow var(--transition);
}

.banner-slider:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 48px rgba(74, 108, 247, 0.18);
}

.slider-track {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.slider-track::-webkit-scrollbar {
  display: none;
}

.slide {
  min-width: 100%;
  scroll-snap-align: start;
  padding: 48px 36px;
  background: var(--gradient-banner);
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.slide::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.22) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.slide h3 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 12px;
  color: #fff;
  position: relative;
  z-index: 1;
  letter-spacing: -0.02em;
}

.slide p {
  color: rgba(255, 255, 255, 0.92);
  margin: 0;
  font-size: 1.02rem;
  position: relative;
  z-index: 1;
  max-width: 640px;
}

/* ===== 统计数字 ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
  margin: 36px 0;
}

.stat-item {
  text-align: center;
  background: var(--surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  padding: 28px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.stat-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(74, 108, 247, 0.3);
}

.stat-item:hover::before {
  transform: scaleX(1);
}

.counter {
  font-size: 2.1rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
  margin-bottom: 4px;
  letter-spacing: -0.03em;
}

.stat-item > div:last-child {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== 通用卡片 ===== */
.card {
  background: var(--surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  padding: 26px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(74, 108, 247, 0.25);
}

.card p:last-child {
  margin-bottom: 0;
}

/* ===== Section ===== */
section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}

section:last-of-type {
  border-bottom: none;
}

/* ===== 文章网格 ===== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 22px;
}

.article-card {
  background: var(--surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, rgba(74, 108, 247, 0.4), rgba(168, 85, 247, 0.4));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

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

.article-card:hover::after {
  opacity: 1;
}

.article-card time {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.article-card h3 {
  font-size: 1.12rem;
  margin: 0 0 10px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
  transition: color var(--transition-fast);
}

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

.article-card p {
  font-size: 0.9rem;
  flex: 1;
  color: var(--text-secondary);
  line-height: 1.65;
}

.read-more {
  font-weight: 700;
  font-size: 0.88rem;
  margin-top: 14px;
  display: inline-block;
  color: var(--primary);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.read-more:hover {
  transform: translateX(4px);
  color: var(--primary-dark);
}

/* ===== FAQ ===== */
details.faq {
  border-bottom: 1px solid var(--border);
  padding: 4px 0;
  transition: background var(--transition-fast);
}

details.faq summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 1.05rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  color: var(--text);
  transition: color var(--transition-fast);
  border-radius: var(--radius-sm);
}

details.faq summary::-webkit-details-marker {
  display: none;
}

details.faq summary::after {
  content: '＋';
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition), color var(--transition-fast);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(74, 108, 247, 0.1);
}

details.faq summary:hover {
  color: var(--primary);
}

details.faq summary:hover::after {
  background: rgba(74, 108, 247, 0.2);
}

details.faq[open] summary::after {
  content: '－';
  transform: rotate(180deg);
  background: var(--gradient-primary);
  color: #fff;
}

details.faq[open] summary {
  color: var(--primary);
}

details.faq p {
  margin-top: 0;
  padding: 0 0 18px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  animation: fadeInUp 0.3s ease forwards;
}

/* ===== HowTo ===== */
.howto-step {
  margin-bottom: 22px;
  padding: 20px 24px;
  border-left: 4px solid transparent;
  border-image: var(--gradient-primary) 1;
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: transform var(--transition), box-shadow var(--transition);
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
}

.howto-step h4 {
  margin-top: 0;
  color: var(--primary);
  font-weight: 700;
}

.howto-step p {
  margin-bottom: 0;
}

/* ===== 表格 ===== */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 22px 0;
  font-size: 0.95rem;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--surface-solid);
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 14px 18px;
  text-align: left;
}

th {
  background: linear-gradient(135deg, #f1f5ff, #f5f0ff);
  font-weight: 700;
  color: var(--text);
}

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

tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: rgba(74, 108, 247, 0.04);
}

/* ===== 作者信息 ===== */
.author-box {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 20px 24px;
  background: var(--surface-glass);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  margin: 24px 0;
  transition: transform var(--transition), box-shadow var(--transition);
}

.author-box:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.author-avatar svg {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(74, 108, 247, 0.3);
  transition: transform var(--transition);
}

.author-box:hover .author-avatar svg {
  transform: scale(1.06) rotate(-3deg);
}

.author-box strong {
  color: var(--text);
  font-weight: 700;
}

.author-box span {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ===== 联系信息 ===== */
.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 24px 0;
}

.contact-item {
  background: var(--surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  padding: 22px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(74, 108, 247, 0.3);
}

.contact-item strong {
  display: block;
  margin-bottom: 8px;
  color: var(--primary);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
}

/* ===== 法律文本 ===== */
.legal-text {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ===== 网站地图 ===== */
.sitemap-list {
  columns: 2;
  column-gap: 40px;
}

.sitemap-list ul {
  list-style: none;
  padding-left: 0;
}

.sitemap-list li {
  margin-bottom: 10px;
  break-inside: avoid;
}

.sitemap-list a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.sitemap-list a:hover {
  color: var(--primary);
  padding-left: 6px;
}

/* ===== 友情链接 ===== */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.friend-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
}

.friend-links a:hover {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(74, 108, 247, 0.3);
}

/* ===== 图片占位 ===== */
.img-wrapper {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  margin: 18px 0;
}

.img-wrapper svg {
  width: 100%;
  height: auto;
}

.lazy-img {
  background: linear-gradient(110deg, #eef2ff 8%, #f5f0ff 18%, #eef2ff 33%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  min-height: 160px;
  animation: shimmer 1.6s linear infinite;
}

@keyframes shimmer {
  to { background-position-x: -200%; }
}

/* ===== 页脚 ===== */
.site-footer {
  background: linear-gradient(180deg, #12121c 0%, #0d0d16 100%);
  color: #b0b0c8;
  padding: 56px 0 28px;
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 36px;
  margin-bottom: 36px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: 16px;
  font-weight: 700;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.footer-col a {
  color: #b0b0c8;
  display: block;
  margin-bottom: 10px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-col a:hover {
  color: #ffffff;
  padding-left: 5px;
}

.footer-col p {
  color: #b0b0c8;
  margin-bottom: 8px;
  font-size: 0.88rem;
}

.footer-bottom {
  border-top: 1px solid #2a2a3a;
  padding-top: 24px;
  text-align: center;
  font-size: 0.84rem;
  color: #7a7a9a;
}

.footer-bottom p {
  color: #7a7a9a;
  margin: 0;
}

/* ===== 移动菜单按钮 ===== */
.mobile-menu-toggle {
  display: none;
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text);
  transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===== 滚动动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-on-scroll {
  animation: fadeInUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

section {
  animation: fadeIn 0.8s ease forwards;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2rem;
  }
  .main-nav a {
    padding: 7px 10px;
    font-size: 0.86rem;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
  }

  .logo {
    font-size: 1.2rem;
  }

  .logo svg {
    width: 32px;
    height: 32px;
  }

  .mobile-menu-toggle {
    display: inline-block;
    margin-left: auto;
  }

  .main-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 4px;
    padding: 12px 0 6px;
    order: 10;
    border-top: 1px solid var(--border);
    margin-top: 6px;
  }

  .main-nav.active {
    display: flex;
    animation: fadeInUp 0.3s ease forwards;
  }

  .main-nav a {
    width: 100%;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
  }

  .search-box {
    width: 100%;
    order: 11;
    margin-top: 4px;
  }

  .search-box input {
    width: 100%;
    flex: 1;
  }

  .search-box input:focus {
    width: 100%;
  }

  .hero {
    padding: 36px 0 32px;
  }

  .hero h1 {
    font-size: 1.55rem;
  }

  .hero .lead {
    font-size: 1rem;
  }

  .btn {
    padding: 11px 24px;
    font-size: 0.95rem;
  }

  h2 {
    font-size: 1.5rem;
    margin-bottom: 22px;
  }

  h3 {
    font-size: 1.18rem;
  }

  section {
    padding: 36px 0;
  }

  .slide {
    padding: 36px 24px;
  }

  .slide h3 {
    font-size: 1.3rem;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .counter {
    font-size: 1.7rem;
  }

  .article-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .sitemap-list {
    columns: 1;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  .author-box {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 1.35rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .stats-row {
    grid-template-columns: 1fr 1fr;
  }

  .stat-item {
    padding: 20px 12px;
  }

  .counter {
    font-size: 1.5rem;
  }

  .anchor-nav a {
    font-size: 0.78rem;
    padding: 5px 10px;
  }

  .contact-info {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    gap: 24px;
  }
}

/* ===== 暗色模式 ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f1a;
    --bg-gradient: linear-gradient(135deg, #0f0f1a 0%, #12121f 50%, #15101f 100%);
    --surface: rgba(26, 26, 46, 0.72);
    --surface-solid: #1a1a2e;
    --surface-glass: rgba(26, 26, 46, 0.55);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text: #e8e8f0;
    --text-secondary: #b0b0c8;
    --text-muted: #7a7a9a;
    --border: rgba(42, 42, 62, 0.8);
    --border-solid: #2a2a3e;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 8px 32px rgba(74, 108, 247, 0.4);
    --gradient-hero: linear-gradient(135deg, #12121f 0%, #15101f 40%, #1a1226 100%);
  }

  .hero h1 {
    background: linear-gradient(135deg, #e8e8f0 0%, #7b93ff 60%, #c084fc 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  th {
    background: linear-gradient(135deg, #1f1f35, #221a33);
  }

  .site-header {
    background: rgba(18, 18, 28, 0.72);
  }

  .author-box {
    background: rgba(26, 26, 46, 0.6);
  }

  .lazy-img {
    background: linear-gradient(110deg, #1a1a2e 8%, #221a33 18%, #1a1a2e 33%);
    background-size: 200% 100%;
  }

  .howto-step {
    background: rgba(26, 26, 46, 0.5);
  }

  .anchor-nav a {
    background: rgba(26, 26, 46, 0.6);
  }

  .friend-links a {
    background: rgba(26, 26, 46, 0.6);
  }

  .search-box input {
    background: rgba(26, 26, 46, 0.6);
  }

  .search-box input:focus {
    background: var(--surface-solid);
  }
}

/* ===== 减少动画偏好 ===== */
@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;
  }
}

/* ===== 打印样式 ===== */
@media print {
  .site-header,
  .back-to-top,
  .search-box,
  .mobile-menu-toggle,
  .hero-actions,
  .banner-slider,
  .anchor-nav {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .card,
  .article-card,
  .stat-item {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}