```css
/* ============================================================
   漫天星漫画 - 热门漫画资源站，连载更新快人一步
   站点: lx44.cn
   风格: 星夜渐变 + 毛玻璃质感 + 圆角卡片
   ============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --brand-deep: #1a1a2e;
  --brand-primary: #2b3a8f;
  --brand-light: #4a5fc1;
  --brand-accent: #ffd166;
  --brand-pink: #ff8fab;
  --brand-mint: #06d6a0;
  --brand-cyan: #118ab2;
  --bg-body: #f7f7fb;
  --bg-card: #ffffff;
  --bg-soft: #eef0ff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.88);
  --text-main: #1a1a2e;
  --text-sub: #555555;
  --text-muted: #888888;
  --text-faint: #666666;
  --border-soft: #e4e4f0;
  --border-input: #d5d7e8;
  --shadow-sm: 0 2px 10px rgba(20, 20, 60, 0.05);
  --shadow-md: 0 4px 16px rgba(20, 20, 60, 0.06);
  --shadow-lg: 0 10px 28px rgba(20, 20, 60, 0.12);
  --shadow-glow: 0 8px 20px rgba(255, 209, 102, 0.35);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 999px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s var(--ease-soft);
  --transition-base: 0.3s var(--ease-out);
  --transition-slow: 0.6s var(--ease-out);
  --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
}

/* ---------- 暗色模式变量 ---------- */
body.dark {
  --bg-body: #12121c;
  --bg-card: #1e1e30;
  --bg-soft: #2a2a44;
  --bg-glass: rgba(30, 30, 48, 0.72);
  --bg-glass-strong: rgba(26, 26, 46, 0.92);
  --text-main: #e8e8f0;
  --text-sub: #b8b8d0;
  --text-muted: #9a9cb8;
  --text-faint: #9a9cb8;
  --border-soft: #2a2a44;
  --border-input: #3a3a5a;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 28px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 8px 20px rgba(255, 209, 102, 0.2);
}

/* ---------- 重置与基础 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-stack);
  background: var(--bg-body);
  color: var(--text-main);
  line-height: 1.8;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.4s var(--ease-soft), color 0.4s var(--ease-soft);
}

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

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

a:hover {
  text-decoration: underline;
}

body.dark a {
  color: #8fa0ff;
}

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

ul,
ol {
  list-style: none;
}

/* ---------- 无障碍 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand-deep);
  color: #ffffff;
  padding: 10px 16px;
  z-index: 9999;
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
}

/* ---------- 顶部导航 ---------- */
header {
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(20, 20, 60, 0.06);
  transition: background-color 0.4s var(--ease-soft), border-color 0.4s var(--ease-soft);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--text-main);
  white-space: nowrap;
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.logo:hover {
  text-decoration: none;
  transform: scale(1.02);
}

.logo svg {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  transition: transform 0.5s var(--ease-out);
}

.logo:hover svg {
  transform: rotate(15deg) scale(1.08);
}

nav[aria-label="主导航"] ul {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

nav[aria-label="主导航"] a {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text-main);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  position: relative;
}

nav[aria-label="主导航"] a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--brand-accent);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

nav[aria-label="主导航"] a:hover {
  background: var(--bg-soft);
  text-decoration: none;
  color: var(--brand-primary);
}

nav[aria-label="主导航"] a:hover::after {
  width: 60%;
}

body.dark nav[aria-label="主导航"] a:hover {
  color: var(--brand-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- 搜索框 ---------- */
.search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-input);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(43, 58, 143, 0.12);
}

.search-box input {
  border: 0;
  outline: 0;
  padding: 8px 12px;
  font-size: 14px;
  width: 150px;
  background: transparent;
  color: var(--text-main);
  font-family: inherit;
}

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

.search-box button {
  border: 0;
  background: var(--brand-primary);
  color: #ffffff;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
  background: var(--brand-light);
}

.search-box button:active {
  transform: scale(0.96);
}

/* ---------- 主题切换与移动菜单按钮 ---------- */
.theme-toggle,
.mobile-menu-btn {
  background: var(--bg-soft);
  border: 0;
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 16px;
  color: var(--text-main);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  line-height: 1;
}

.theme-toggle:hover,
.mobile-menu-btn:hover {
  background: var(--brand-accent);
  transform: translateY(-1px);
}

.theme-toggle:active,
.mobile-menu-btn:active {
  transform: scale(0.94);
}

.mobile-menu-btn {
  display: none;
  font-size: 18px;
  padding: 8px 12px;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  max-width: 1180px;
  margin: 16px auto 0;
  padding: 0 20px;
  font-size: 14px;
  color: var(--text-faint);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 6px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-faint);
}

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

body.dark .breadcrumb a:hover {
  color: var(--brand-accent);
}

/* ---------- Hero Banner ---------- */
.hero {
  background: linear-gradient(135deg, #1a1a2e 0%, #2b3a8f 55%, #4a5fc1 100%);
  color: #ffffff;
  padding: 56px 20px 48px;
  margin-top: 20px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(255, 209, 102, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: heroFloat 12s ease-in-out infinite;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -8%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(255, 143, 171, 0.14) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: heroFloat 15s ease-in-out infinite reverse;
}

@keyframes heroFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-24px, 18px) scale(1.06); }
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 36px;
  line-height: 1.35;
  margin-bottom: 16px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.hero h1 span {
  color: var(--brand-accent);
  position: relative;
  display: inline-block;
}

.hero h1 span::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 6px;
  background: rgba(255, 209, 102, 0.25);
  border-radius: var(--radius-full);
  z-index: -1;
}

.hero p {
  font-size: 17px;
  opacity: 0.92;
  margin-bottom: 24px;
  max-width: 640px;
  line-height: 1.9;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-fast);
  position: relative;
  overflow: hidden;
  border: 0;
  cursor: pointer;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: left 0.6s var(--ease-out);
}

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

.btn-primary {
  background: var(--brand-accent);
  color: var(--brand-deep);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  text-decoration: none;
}

.btn-ghost {
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  color: #ffffff;
  background: transparent;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  text-decoration: none;
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.9);
}

/* ---------- Hero 视觉 ---------- */
.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-visual svg {
  width: 100%;
  max-width: 420px;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.25));
  animation: heroVisualFloat 6s ease-in-out infinite;
}

@keyframes heroVisualFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- 统计卡片 ---------- */
.stats {
  max-width: 1180px;
  margin: -28px auto 0;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  position: relative;
  z-index: 2;
}

.stat-card {
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.stat-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--brand-primary);
  line-height: 1.3;
  font-variant-numeric: tabular-nums;
}

body.dark .stat-num {
  color: var(--brand-accent);
}

.stat-label {
  font-size: 14px;
  color: var(--text-faint);
  margin-top: 4px;
}

/* ---------- 容器与区块 ---------- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 52px 0 8px;
}

.section-title {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-main);
  position: relative;
  display: inline-block;
  letter-spacing: -0.3px;
}

.section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  margin-top: 8px;
  background: linear-gradient(90deg, var(--brand-accent), var(--brand-primary));
  border-radius: var(--radius-full);
}

.section-sub {
  color: var(--text-faint);
  font-size: 15px;
  margin-bottom: 28px;
  margin-top: 6px;
}

/* ---------- 网格布局 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-accent), var(--brand-primary), var(--brand-mint));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(43, 58, 143, 0.2);
}

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

.card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text-main);
  font-weight: 700;
}

.card p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.85;
}

.card-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  transition: transform var(--transition-base);
}

.card:hover .card-icon {
  transform: scale(1.1) rotate(-4deg);
}

/* ---------- 文章列表 ---------- */
.article-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.article-card {
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(255, 209, 102, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(43, 58, 143, 0.2);
}

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

.article-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.5;
}

.article-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.article-card p {
  font-size: 14.5px;
  color: var(--text-sub);
  flex: 1;
  line-height: 1.85;
}

.read-more {
  margin-top: 12px;
  font-weight: 600;
  font-size: 14px;
  color: var(--brand-primary);
  display: inline-block;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.read-more:hover {
  text-decoration: none;
  transform: translateX(4px);
  color: var(--brand-light);
}

body.dark .read-more {
  color: var(--brand-accent);
}

/* ---------- FAQ 手风琴 ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
}

.faq-item {
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  backdrop-filter: blur(12px) saturate(160%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(43, 58, 143, 0.18);
}

.faq-item.open {
  border-color: rgba(43, 58, 143, 0.28);
  box-shadow: var(--shadow-md);
}

.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-main);
  font-family: inherit;
  line-height: 1.6;
  transition: color var(--transition-fast);
}

.faq-q:hover {
  color: var(--brand-primary);
}

body.dark .faq-q:hover {
  color: var(--brand-accent);
}

.faq-q::after {
  content: "＋";
  font-size: 20px;
  color: var(--brand-primary);
  transition: transform 0.3s var(--ease-out), color var(--transition-fast);
  flex-shrink: 0;
  margin-left: 12px;
  line-height: 1;
}

body.dark .faq-q::after {
  color: var(--brand-accent);
}

.faq-item.open .faq-q::after {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out), padding 0.4s var(--ease-out);
  padding: 0 20px;
}

.faq-item.open .faq-a {
  max-height: 800px;
  padding: 0 20px 18px;
}

.faq-a p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.9;
}

/* ---------- HowTo 步骤 ---------- */
.howto-steps {
  counter-reset: step;
  list-style: none;
  display: flex;
  flex-direction: column;
}

.howto-steps li {
  position: relative;
  padding: 16px 16px 16px 64px;
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  backdrop-filter: blur(12px) saturate(160%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.howto-steps li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(43, 58, 143, 0.2);
}

.howto-steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 16px;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-light));
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  box-shadow: 0 4px 10px rgba(43, 58, 143, 0.3);
  transition: transform var(--transition-base);
}

.howto-steps li:hover::before {
  transform: scale(1.12) rotate(-8deg);
}

.howto-steps li strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text-main);
  font-weight: 700;
  font-size: 16px;
}

.howto-steps li p {
  font-size: 14.5px;
  color: var(--text-sub);
  line-height: 1.85;
}

/* ---------- 联系卡片 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.contact-card {
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(43, 58, 143, 0.2);
}

.contact-card h3 {
  font-size: 17px;
  margin-bottom: 12px;
  color: var(--text-main);
  font-weight: 700;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--bg-soft);
}

body.dark .contact-card h3 {
  border-bottom-color: rgba(255, 209, 102, 0.2);
}

.contact-card p {
  font-size: 15px;
  color: var(--text-sub);
  margin-bottom: 6px;
  line-height: 1.85;
}

.contact-card strong {
  color: var(--text-main);
  font-weight: 600;
}

/* ---------- 页脚 ---------- */
footer {
  background: linear-gradient(180deg, #1a1a2e 0%, #14142a 100%);
  color: #c9cbe0;
  margin-top: 60px;
  padding: 48px 20px 24px;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-accent), var(--brand-primary), var(--brand-mint));
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  margin-bottom: 32px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 16px;
  margin-bottom: 14px;
  font-weight: 700;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--brand-accent);
  border-radius: var(--radius-full);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  color: #c9cbe0;
  font-size: 14px;
  text-decoration: none;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.footer-col a:hover {
  color: var(--brand-accent);
  padding-left: 4px;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  font-size: 13px;
  text-align: center;
  color: #9a9cb8;
  line-height: 1.9;
}

.footer-bottom p + p {
  margin-top: 6px;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 28px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-light));
  color: #ffffff;
  border: 0;
  cursor: pointer;
  font-size: 20px;
  box-shadow: 0 6px 18px rgba(43, 58, 143, 0.4);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 900;
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
}

.back-to-top.show {
  display: flex;
  animation: fadeInUp 0.4s var(--ease-out);
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 10px 26px rgba(43, 58, 143, 0.55);
}

.back-to-top:active {
  transform: scale(0.94);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 滚动入场动画 ---------- */
.card,
.article-card,
.howto-steps li {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.card.visible,
.article-card.visible,
.howto-steps li.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 焦点可见性 ---------- */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- 选中文本 ---------- */
::selection {
  background: rgba(255, 209, 102, 0.4);
  color: var(--brand-deep);
}

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

::-webkit-scrollbar-track {
  background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--brand-primary), var(--brand-light));
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-body);
}

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

/* ============================================================
   响应式 - 平板与移动端
   ============================================================ */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-visual {
    order: -1;
    max-width: 320px;
    margin: 0 auto;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero p {
    font-size: 16px;
  }

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

  .grid-3,
  .grid-2,
  .article-list,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  nav[aria-label="主导航"] ul {
    display: none;
  }

  nav[aria-label="主导航"] ul.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-glass-strong);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    backdrop-filter: blur(18px) saturate(180%);
    padding: 12px 20px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--border-soft);
    animation: menuSlide 0.3s var(--ease-out);
  }

  @keyframes menuSlide {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  nav[aria-label="主导航"] ul.open a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .mobile-menu-btn {
    display: block;
  }

  .search-box input {
    width: 110px;
  }

  section {
    padding: 40px 0 8px;
  }

  .section-title {
    font-size: 22px;
  }
}

@media (max-width: 520px) {
  .stats {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero {
    padding: 40px 16px 36px;
  }

  .hero h1 {
    font-size: 24px;
  }

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

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

  .header-inner {
    padding: 10px 14px;
    gap: 8px;
  }

  .logo {
    font-size: 17px;
  }

  .logo svg {
    width: 28px;
    height: 28px;
  }

  .search-box input {
    width: 90px;
    padding: 7px 10px;
  }

  .search-box button {
    padding: 7px 10px;
    font-size: 13px;
  }

  .container {
    padding: 0 14px;
  }

  .stat-num {
    font-size: 22px;
  }

  .stat-card {
    padding: 16px 12px;
  }

  .card,
  .article-card,
  .contact-card {
    padding: 18px;
  }

  .howto-steps li {
    padding: 14px 14px 14px 56px;
  }

  .howto-steps li::before {
    left: 14px;
    top: 14px;
    width: 28px;
    height: 28px;
    font-size: 13px;
  }

  .back-to-top {
    right: 14px;
    bottom: 18px;
    width: 42px;
    height: 42px;
  }

  .breadcrumb {
    font-size: 13px;
    padding: 0 14px;
  }
}

/* ---------- 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;
  }

  .card,
  .article-card,
  .howto-steps li {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  header,
  footer,
  .back-to-top,
  .theme-toggle,
  .mobile-menu-btn,
  .search-box,
  .hero-visual {
    display: none !important;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  .card,
  .article-card,
  .faq-item,
  .howto-steps li {
    box-shadow: none;
    border: 1px solid #cccccc;
    opacity: 1;
    transform: none;
  }
}
```