```css
/* ===== 九一 · 二次元同好聚集地 专属样式 ===== */
/* 风格：日系赛博 × 柔和玻璃拟态 × 霓虹渐变 */
/* 支持暗色模式 / 响应式 / 滚动动画 / hover微交互 */

/* ---------- 设计令牌 ---------- */
:root {
  /* 主色板 - 灵感来自黄昏下的秋叶原 */
  --bg-primary: #F4F6FB;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-nav: rgba(20, 30, 48, 0.85);
  --text-primary: #1F2937;
  --text-secondary: #3E4C5E;
  --text-heading: #0F172A;
  --text-link: #2563EB;
  --border-color: rgba(148, 163, 184, 0.25);
  --bg-footer: #0F172A;
  --text-footer: #E2E8F0;
  --text-footer-muted: #94A3B8;
  --btn-bg: #F59E0B;
  --btn-text: #1E293B;
  --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.18);
  --gradient-hero: linear-gradient(135deg, #1E3A5F 0%, #4A6FA5 50%, #7C9EC0 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.5));
  --glass-blur: blur(12px);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

  /* 暗色模式变量 */
  --dark-bg: #0D1117;
  --dark-card: rgba(22, 27, 34, 0.8);
  --dark-text: #C9D4E3;
  --dark-heading: #F0F6FF;
  --dark-border: rgba(148, 163, 184, 0.15);
  --dark-nav: rgba(10, 14, 23, 0.9);
  --dark-footer: #0A0E17;
  --dark-link: #93C5FD;
  --dark-btn-bg: #FBBF24;
  --dark-btn-text: #1E293B;
  --gradient-dark-hero: linear-gradient(135deg, #0B1120 0%, #1E293B 50%, #2D3A4A 100%);
  --gradient-dark-card: linear-gradient(145deg, rgba(30,41,59,0.85), rgba(30,41,59,0.5));
}

/* ---------- 基础重置与全局 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(245, 158, 11, 0.04) 0%, transparent 40%);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

body.dark-mode {
  background-color: var(--dark-bg);
  background-image:
    radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(245, 158, 11, 0.06) 0%, transparent 40%);
  color: var(--dark-text);
}

/* 文字层级 - 高对比 */
h1, h2, h3, h4 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4 {
  color: var(--dark-heading);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 0.8rem;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  margin: 2.5rem 0 1.5rem;
  padding-left: 1.2rem;
  border-left: 6px solid transparent;
  border-image: linear-gradient(180deg, #F59E0B, #2563EB) 1;
  position: relative;
}

h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  margin-top: 8px;
  background: linear-gradient(90deg, #F59E0B, #2563EB);
  border-radius: 2px;
}

h3 {
  font-size: 1.35rem;
  margin: 1.5rem 0 0.8rem;
}

h4 {
  font-size: 1.1rem;
  margin: 1rem 0 0.5rem;
  color: var(--text-secondary);
  font-weight: 600;
}

body.dark-mode h4 {
  color: #A5B4CB;
}

p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

body.dark-mode p {
  color: var(--dark-text);
}

a {
  color: var(--text-link);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

body.dark-mode a {
  color: var(--dark-link);
}

a:hover {
  color: #1E40AF;
  text-decoration: underline;
  text-underline-offset: 4px;
}

body.dark-mode a:hover {
  color: #DBEAFE;
}

/* ---------- 容器 ---------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ---------- 导航栏 - 毛玻璃效果 ---------- */
.navbar {
  background: var(--bg-nav);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

body.dark-mode .navbar {
  background: var(--dark-nav);
  border-bottom-color: rgba(255, 255, 255, 0.05);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding-top: 0.8rem;
  padding-bottom: 0.8rem;
}

.logo a {
  font-size: 1.9rem;
  font-weight: 800;
  background: linear-gradient(135deg, #F59E0B, #FBBF24);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
  text-shadow: 0 2px 10px rgba(245, 158, 11, 0.2);
  transition: transform var(--transition-fast);
  display: inline-block;
}

.logo a:hover {
  transform: scale(1.05);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1.8rem;
  list-style: none;
}

.nav-links a {
  color: #E2E8F0;
  font-weight: 500;
  padding: 0.5rem 0.2rem;
  border-bottom: 2px solid transparent;
  position: relative;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

body.dark-mode .nav-links a {
  color: #CBD5E1;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #F59E0B, #60A5FA);
  transition: width var(--transition-smooth);
}

.nav-links a:hover {
  color: #FFFFFF;
  text-decoration: none;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  gap: 0.8rem;
  align-items: center;
}

.nav-actions button {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #E2E8F0;
  padding: 0.4rem 1rem;
  border-radius: 30px;
  cursor: pointer;
  font-size: 0.9rem;
  backdrop-filter: blur(4px);
  transition: all var(--transition-fast);
}

body.dark-mode .nav-actions button {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
}

.nav-actions button:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.mobile-menu-btn {
  display: none;
  background: rgba(255, 255, 255, 0.08) !important;
  border: 1px solid rgba(255, 255, 255, 0.15) !important;
  color: #E2E8F0 !important;
  padding: 0.3rem 0.8rem !important;
  border-radius: 8px !important;
  font-size: 1.3rem !important;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    padding: 1rem 0;
    gap: 0.8rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    margin-top: 0.5rem;
  }

  .nav-links.active {
    display: flex;
  }

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

/* ---------- Hero Banner - 渐变 + 玻璃拟态 ---------- */
.hero {
  background: var(--gradient-hero);
  color: #FFFFFF;
  padding: 5rem 0;
  margin-bottom: 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 60%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translateX(0) scale(1); }
  100% { transform: translateX(-30px) scale(1.1); }
}

body.dark-mode .hero {
  background: var(--gradient-dark-hero);
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

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

.hero-text h1 {
  color: #FFFFFF;
  font-size: clamp(2.2rem, 5.5vw, 3.5rem);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  line-height: 1.2;
  background: linear-gradient(135deg, #FFFFFF 0%, #E0E7FF 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-text p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.2rem;
  max-width: 600px;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-cta {
  background: linear-gradient(135deg, #F59E0B, #FBBF24);
  color: #1E293B;
  padding: 0.9rem 2.2rem;
  border-radius: 50px;
  font-weight: 700;
  display: inline-block;
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
  transition: all var(--transition-smooth);
  font-size: 1.05rem;
  letter-spacing: 0.5px;
}

.hero-cta:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 35px rgba(245, 158, 11, 0.5);
  color: #1E293B;
  text-decoration: none;
}

.hero-image {
  flex: 0 1 280px;
  text-align: center;
}

.hero-image svg {
  width: 100%;
  max-width: 240px;
  height: auto;
  filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.25));
  animation: float 4s ease-in-out infinite;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  padding: 10px;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@media (max-width: 768px) {
  .hero {
    padding: 3rem 0;
  }

  .hero-text h1 {
    font-size: 2.2rem;
  }

  .hero-text p {
    font-size: 1rem;
  }

  .hero-image svg {
    max-width: 180px;
  }
}

/* ---------- 卡片 - 玻璃拟态 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2.5rem 0;
}

.card {
  background: var(--gradient-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  padding: 2rem 1.8rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #F59E0B, #2563EB);
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(255, 255, 255, 0.9);
}

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

body.dark-mode .card {
  background: var(--gradient-dark-card);
  border-color: rgba(148, 163, 184, 0.15);
}

body.dark-mode .card:hover {
  border-color: rgba(148, 163, 184, 0.3);
}

.card h3 {
  margin-top: 0;
  position: relative;
}

.card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

body.dark-mode .card p {
  color: #A5B4CB;
}

.card a {
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

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

/* ---------- 文章列表 ---------- */
.article-list {
  margin: 2rem 0;
}

.article-item {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 1.8rem 2rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.article-item::after {
  content: '';
  position: absolute;
  right: -20px;
  top: -20px;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(37, 99, 235, 0.1));
  border-radius: 50%;
  transition: transform var(--transition-smooth);
}

.article-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(245, 158, 11, 0.3);
}

.article-item:hover::after {
  transform: scale(2);
}

body.dark-mode .article-item {
  background: var(--dark-card);
  border-color: rgba(148, 163, 184, 0.15);
}

body.dark-mode .article-item:hover {
  border-color: rgba(245, 158, 11, 0.3);
}

.article-item h3 {
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
  transition: color var(--transition-fast);
}

.article-item:hover h3 {
  color: var(--text-link);
}

body.dark-mode .article-item:hover h3 {
  color: var(--dark-link);
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

body.dark-mode .article-meta {
  color: #8A9BAE;
}

.article-meta::before {
  content: '✦';
  color: #F59E0B;
}

/* ---------- FAQ 手风琴 ---------- */
.faq-item {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  padding: 1.2rem 1.8rem;
  transition: all var(--transition-smooth);
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(245, 158, 11, 0.3);
}

body.dark-mode .faq-item {
  background: var(--dark-card);
  border-color: rgba(148, 163, 184, 0.15);
}

.faq-question {
  font-weight: 700;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  font-size: 1.05rem;
}

body.dark-mode .faq-question {
  color: var(--dark-heading);
}

.faq-question span {
  font-size: 1.5rem;
  font-weight: 300;
  color: #F59E0B;
  transition: transform var(--transition-smooth);
  display: inline-block;
}

.faq-item.open .faq-question span {
  transform: rotate(45deg);
}

.faq-answer {
  margin-top: 1rem;
  color: var(--text-primary);
  border-top: 1px dashed var(--border-color);
  padding-top: 1rem;
  line-height: 1.8;
}

body.dark-mode .faq-answer {
  color: var(--dark-text);
  border-top-color: var(--dark-border);
}

/* ---------- HowTo 步骤 ---------- */
.howto-step {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 1.5rem 2rem;
  border-left: 6px solid transparent;
  border-image: linear-gradient(180deg, #F59E0B, #2563EB) 1;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}

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

body.dark-mode .howto-step {
  background: var(--dark-card);
}

.howto-step h3 {
  margin-top: 0;
  font-size: 1.1rem;
  color: #F59E0B;
}

/* ---------- 表格 ---------- */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

body.dark-mode th,
body.dark-mode td {
  border-color: var(--dark-border);
}

th {
  background: linear-gradient(135deg, #E2E8F0, #F1F5F9);
  color: #1E293B;
  font-weight: 700;
}

body.dark-mode th {
  background: linear-gradient(135deg, #2D3A4A, #1E293B);
  color: #F1F5F9;
}

tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.05);
}

/* ---------- 按钮 ---------- */
.btn-primary {
  background: linear-gradient(135deg, #2563EB, #1D4ED8);
  color: var(--btn-text);
  padding: 0.8rem 1.8rem;
  border-radius: 50px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
  transition: all var(--transition-smooth);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
}

body.dark-mode .btn-primary {
  background: linear-gradient(135deg, #FBBF24, #F59E0B);
  color: #1E293B;
}

/* ---------- 搜索框 ---------- */
.search-box {
  display: flex;
  gap: 0.5rem;
  margin: 2rem 0;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 0.5rem;
  border-radius: 50px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-sm);
}

.search-box input {
  flex: 1;
  padding: 0.7rem 1.2rem;
  border: none;
  border-radius: 50px;
  background: transparent;
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
}

body.dark-mode .search-box {
  background: var(--dark-card);
  border-color: rgba(148, 163, 184, 0.15);
}

body.dark-mode .search-box input {
  color: var(--dark-text);
}

.search-box input::placeholder {
  color: #94A3B8;
}

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ---------- 回到顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  background: linear-gradient(135deg, #2563EB, #1D4ED8);
  color: white;
  border: none;
  border-radius: 50%;
  width: 52px;
  height: 52px;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
  z-index: 999;
  transition: all var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 35px rgba(37, 99, 235, 0.5);
}

body.dark-mode .back-to-top {
  background: linear-gradient(135deg, #FBBF24, #F59E0B);
  color: #1E293B;
}

/* ---------- 图片懒加载占位 ---------- */
.lazy-img {
  background: linear-gradient(90deg, #E5E7EB 25%, #F3F4F6 37%, #E5E7EB 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
}

@keyframes shimmer {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

/* ---------- 通用辅助 ---------- */
.text-muted {
  color: var(--text-secondary) !important;
}

body.dark-mode .text-muted {
  color: #8A9BAE !important;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #F59E0B, #2563EB, #F59E0B);
}

body.dark-mode .footer {
  background: var(--dark-footer);
}

.footer a {
  color: #93C5FD;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: #FFFFFF;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-links a {
  color: #CBD5E1;
  position: relative;
}

.footer-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: #F59E0B;
  transition: width var(--transition-smooth);
}

.footer-links a:hover::after {
  width: 100%;
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding-top: 2rem;
  font-size: 0.9rem;
  color: var(--text-footer-muted);
}

.footer-bottom p {
  margin-bottom: 0.5rem;
  color: var(--text-footer-muted);
}

/* ---------- 友情链接 ---------- */
section .container > div[style*="flex"] {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem !important;
  padding: 1rem;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

body.dark-mode section .container > div[style*="flex"] {
  background: var(--dark-card);
  border-color: rgba(148, 163, 184, 0.15);
}

section .container > div[style*="flex"] a {
  padding: 0.5rem 1rem;
  background: rgba(37, 99, 235, 0.08);
  border-radius: 30px;
  transition: all var(--transition-fast);
}

section .container > div[style*="flex"] a:hover {
  background: rgba(37, 99, 235, 0.15);
  transform: translateY(-2px);
}

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

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .article-item {
    padding: 1.2rem;
  }

  .faq-item {
    padding: 1rem 1.2rem;
  }

  .howto-step {
    padding: 1.2rem;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }

  .footer-links {
    gap: 1rem;
  }
}

/* 打印样式 */
@media print {
  .navbar,
  .hero,
  .back-to-top,
  .search-box,
  .nav-actions {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card,
  .article-item,
  .faq-item,
  .howto-step {
    box-shadow: none;
    border: 1px solid #ddd;
    background: white;
  }
}

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