```css
/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  transition: background 0.4s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* ===== 主题变量 (Light) ===== */
:root {
  --bg-body: #f5f7fa;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-navbar: rgba(255, 255, 255, 0.65);
  --bg-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --bg-footer: #0f172a;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: rgba(148, 163, 184, 0.2);
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --btn-bg: #1e293b;
  --btn-text: #ffffff;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 30px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 20px 60px rgba(15, 23, 42, 0.18);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --blur: blur(16px);
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 暗色模式变量 ===== */
body.dark-mode {
  --bg-body: #0b1120;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-navbar: rgba(2, 6, 23, 0.75);
  --bg-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f3460 100%);
  --bg-footer: #020617;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: rgba(148, 163, 184, 0.15);
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --btn-bg: #e2e8f0;
  --btn-text: #0f172a;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--accent-hover));
  border-radius: 20px;
  border: 2px solid transparent;
  background-clip: content-box;
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  transition: color 0.3s ease;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin: 2rem 0 1.2rem; }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

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

a {
  color: var(--accent);
  text-decoration: none;
  position: relative;
  transition: color 0.3s ease;
}

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

/* ===== 通用容器 ===== */
.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-md);
  border-color: rgba(59, 130, 246, 0.3);
}

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

/* ===== 导航栏 ===== */
.navbar {
  background: var(--bg-navbar);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border-color);
  padding: 0.8rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.navbar .logo {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.navbar .logo span {
  font-size: 1.8rem;
  margin-left: 2px;
}

.desktop-nav {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.desktop-nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0;
  position: relative;
  transition: color 0.3s ease;
}

.desktop-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.desktop-nav a:hover {
  color: var(--accent);
}

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

/* ===== 按钮 ===== */
.btn {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: 2px solid transparent;
  padding: 0.6rem 1.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  background: var(--accent);
  color: white;
}

.btn:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  box-shadow: none;
}

.btn-outline:hover {
  border-color: var(--accent);
  background: transparent;
  color: var(--accent);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.15);
}

/* ===== Hero 区域 ===== */
.hero {
  background: var(--bg-hero);
  background-size: 400% 400%;
  animation: gradientShift 12s ease infinite;
  color: white;
  padding: 4rem 2rem;
  border-radius: var(--radius-lg);
  margin: 2rem 0;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

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

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.2), transparent 70%);
  animation: pulse 6s ease-in-out infinite;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.2), transparent 70%);
  animation: pulse 8s ease-in-out infinite reverse;
  pointer-events: none;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.2); opacity: 1; }
}

.hero h1 {
  color: white;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.15rem;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-size: 0.9rem;
  padding: 1rem 0;
  color: var(--text-muted);
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--accent);
  transition: opacity 0.3s ease;
}

.breadcrumb a:hover {
  opacity: 0.8;
}

.breadcrumb .separator {
  color: var(--text-muted);
  margin: 0 0.25rem;
}

.breadcrumb .current {
  color: var(--text-primary);
  font-weight: 500;
}

/* ===== 品牌区 ===== */
.brand-section {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  margin: 3rem 0;
  align-items: start;
}

.brand-info {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.brand-sidebar {
  background: linear-gradient(145deg, var(--bg-card), rgba(59, 130, 246, 0.05));
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 100px;
}

.brand-sidebar h3 {
  color: var(--accent);
  margin-bottom: 1rem;
}

.brand-sidebar p {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.brand-sidebar .label {
  font-weight: 600;
  color: var(--text-primary);
}

/* ===== 解决方案卡片 ===== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.solution-card {
  text-align: center;
  padding: 2.5rem 2rem;
  position: relative;
  overflow: hidden;
}

.solution-card .icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: inline-block;
  transition: transform 0.4s ease;
}

.solution-card:hover .icon {
  transform: scale(1.1) rotate(5deg);
}

/* ===== 客户评价 ===== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.testimonial-card {
  position: relative;
  padding: 2rem;
}

.testimonial-card::after {
  content: '"';
  position: absolute;
  top: -20px;
  right: 20px;
  font-size: 6rem;
  font-family: Georgia, serif;
  color: rgba(59, 130, 246, 0.1);
  line-height: 1;
}

.testimonial-card p {
  font-style: italic;
  margin-bottom: 1rem;
}

.testimonial-card .author {
  font-weight: 600;
  color: var(--accent);
  font-style: normal;
}

/* ===== 文章卡片 ===== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.8rem;
  margin: 2rem 0;
}

.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: var(--transition);
}

.article-card .article-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.article-card h3 {
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.article-card .excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  flex: 1;
  margin-bottom: 1rem;
}

.article-card .read-more {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: gap 0.3s ease;
}

.article-card .read-more:hover {
  gap: 0.8rem;
}

/* ===== FAQ 折叠面板 ===== */
.faq-container {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

details {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

details:hover {
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: var(--shadow-sm);
}

details summary {
  padding: 1.2rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.3s ease;
  user-select: none;
}

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

details summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--accent);
  transition: transform 0.3s ease;
  line-height: 1;
}

details[open] summary::after {
  transform: rotate(45deg);
}

details[open] summary {
  background: rgba(59, 130, 246, 0.05);
}

details .faq-answer {
  padding: 0 1.5rem 1.2rem;
  color: var(--text-secondary);
  animation: slideDown 0.3s ease;
}

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

/* ===== 教程卡片 ===== */
.tutorial-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  margin: 2rem 0;
}

.tutorial-card ol {
  padding-left: 1.5rem;
  margin: 1rem 0;
}

.tutorial-card li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.tutorial-card h4 {
  margin-top: 1.5rem;
  color: var(--accent);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-footer);
  color: #94a3b8;
  margin-top: 4rem;
  padding: 3rem 0 2rem;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #8b5cf6, var(--accent));
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.site-footer h4 {
  color: white;
  margin-bottom: 1rem;
  font-weight: 600;
}

.site-footer p {
  color: #94a3b8;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

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

.site-footer ul li {
  margin-bottom: 0.5rem;
}

.site-footer ul a {
  color: #94a3b8;
  font-size: 0.9rem;
  transition: color 0.3s ease, padding-left 0.3s ease;
}

.site-footer ul a:hover {
  color: white;
  padding-left: 5px;
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.1);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
}

/* ===== 返回顶部按钮 ===== */
#backTop {
  position: fixed;
  right: 25px;
  bottom: 30px;
  width: 50px;
  height: 50px;
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

#backTop.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#backTop:hover {
  transform: translateY(-5px) scale(1.05);
  background: var(--accent);
  color: white;
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

/* ===== 搜索框 ===== */
.search-box {
  position: fixed;
  top: 90px;
  right: 20px;
  width: 320px;
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  z-index: 1001;
  animation: fadeInScale 0.3s ease;
  display: none;
}

.search-box input {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color 0.3s ease;
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent);
}

.search-box .btn {
  width: 100%;
  margin-top: 0.8rem;
  justify-content: center;
}

@keyframes fadeInScale {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

/* ===== 移动菜单 ===== */
.mobile-menu {
  display: none;
}

.mobile-nav-content {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-navbar);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 1500;
  padding: 2rem;
  animation: slideInLeft 0.3s ease;
}

.mobile-nav-content a {
  display: block;
  padding: 1rem 0;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

.mobile-nav-content a:hover {
  color: var(--accent);
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

/* ===== 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);
}

/* ===== 响应式布局 ===== */
@media (max-width: 1024px) {
  .brand-section {
    grid-template-columns: 1fr;
  }
  
  .brand-sidebar {
    position: static;
    margin-top: 1rem;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0.8rem 1rem;
  }
  
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu {
    display: block;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-primary);
  }
  
  .navbar .btn-group {
    display: none;
  }
  
  .hero {
    padding: 2.5rem 1.2rem;
    margin: 1rem 0;
    border-radius: 20px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .container {
    padding: 0 1rem;
  }
  
  .card {
    padding: 1.2rem;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  
  .solutions-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }
  
  .search-box {
    width: calc(100% - 40px);
    right: 20px;
  }
  
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }
}

@media (max-width: 480px) {
  .navbar .logo {
    font-size: 1.1rem;
  }
  
  #backTop {
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
    right: 15px;
    bottom: 20px;
  }
  
  .hero {
    padding: 2rem 1rem;
  }
  
  .hero h1 {
    font-size: 1.5rem;
  }
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent);
  padding: 0.3rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  margin: 0.25rem;
  transition: var(--transition);
  border: 1px solid transparent;
}

.tag:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ===== 表格样式 ===== */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}

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

th {
  background: rgba(59, 130, 246, 0.05);
  font-weight: 600;
  color: var(--text-primary);
}

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

tr:hover td {
  background: rgba(59, 130, 246, 0.02);
}

/* ===== 图片懒加载占位 ===== */
img.lazy {
  background: linear-gradient(90deg, var(--border-color) 25%, rgba(255,255,255,0.1) 50%, var(--border-color) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  min-height: 200px;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== 数字动画 ===== */
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

/* ===== 暗色模式额外优化 ===== */
body.dark-mode .card,
body.dark-mode .brand-info,
body.dark-mode .brand-sidebar,
body.dark-mode .tutorial-card,
body.dark-mode details {
  background: var(--bg-card);
  border-color: var(--border-color);
}

body.dark-mode .navbar {
  background: var(--bg-navbar);
  border-bottom-color: var(--border-color);
}

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

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

/* ===== 打印样式 ===== */
@media print {
  .navbar, .site-footer, #backTop, .search-box, .mobile-menu {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card, .brand-info, .brand-sidebar, .tutorial-card {
    background: white;
    border: 1px solid #ccc;
    box-shadow: none;
  }
  
  h1, h2, h3, h4, p {
    color: black !important;
  }
}

/* ===== 无障碍支持 ===== */
@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: 4px;
}

/* ===== 暗色模式切换按钮特殊样式 ===== */
#darkToggle {
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
}

/* ===== 搜索按钮 ===== */
#searchBtn {
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
}

/* ===== 移动菜单按钮 ===== */
#menuToggle {
  display: none;
}

@media (max-width: 768px) {
  #menuToggle {
    display: block;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-primary);
    padding: 0.2rem;
  }
}
```