```css
/* ============================================
   91妈妈 (kuaishicai.cn) - 完整样式表
   风格：温暖、专业、现代
   ============================================ */

/* ===== CSS 变量与主题 ===== */
:root {
  /* 主色调 - 温暖琥珀 + 深海蓝 */
  --brand-primary: #2C3E50;
  --brand-secondary: #E67E22;
  --brand-gradient: linear-gradient(135deg, #2C3E50 0%, #E67E22 100%);
  
  /* 背景色 */
  --bg-light: #F8F9FA;
  --bg-dark: #1E293B;
  --bg-hero-light: linear-gradient(135deg, #EBF5FB 0%, #FFFFFF 100%);
  --bg-hero-dark: linear-gradient(135deg, #1E293B 0%, #2D3A4A 100%);
  
  /* 文字色 */
  --text-light: #1F2937;
  --text-dark: #E2E8F0;
  --heading-light: #111827;
  --heading-dark: #F9FAFB;
  
  /* 卡片与边框 */
  --card-bg: #FFFFFF;
  --card-bg-dark: #2D3A4A;
  --border-light: #E5E7EB;
  --border-dark: #4B5563;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --card-shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.12);
  
  /* 辅助色 */
  --muted-light: #6B7280;
  --muted-dark: #9CA3AF;
  --accent: #E67E22;
  --link-light: #1F4E79;
  --link-dark: #7FB3D8;
  
  /* 按钮 */
  --btn-bg: #2C3E50;
  --btn-bg-hover: #1A252F;
  --btn-text: #FFFFFF;
  
  /* 毛玻璃 */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-bg-dark: rgba(30, 41, 59, 0.85);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  
  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;
}

/* ===== 暗色模式变量覆盖 ===== */
body.dark-mode {
  --bg-light: #1E293B;
  --text-light: #E2E8F0;
  --heading-light: #F9FAFB;
  --card-bg: #2D3A4A;
  --border-light: #4B5563;
  --muted-light: #9CA3AF;
  --link-light: #7FB3D8;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  --card-shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.5);
  --glass-bg: rgba(30, 41, 59, 0.85);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* ===== 基础重置 ===== */
*,
*::before,
*::after {
  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, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-light);
  color: var(--text-light);
  line-height: 1.7;
  font-size: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

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

a {
  color: var(--link-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

h1, h2, h3, h4, h5, h6 {
  color: var(--heading-light);
  font-weight: 700;
  line-height: 1.3;
  transition: color 0.3s ease;
}

p {
  margin-bottom: 1rem;
}

/* ===== 容器 ===== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 640px) {
  .container {
    padding: 0 24px;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 32px;
  }
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

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

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 20px;
  gap: 20px;
}

.logo a {
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
  text-decoration: none;
}

.logo a::after {
  content: '';
  display: block;
  height: 3px;
  width: 0;
  background: var(--accent);
  transition: width 0.3s ease;
  margin-top: 4px;
}

.logo a:hover::after {
  width: 100%;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-light);
  font-weight: 500;
  font-size: 1rem;
  position: relative;
  padding: 8px 0;
}

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

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

body.dark-mode .nav-links a {
  color: var(--text-dark);
}

.search-box {
  display: none;
  align-items: center;
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 8px 16px;
  transition: all 0.3s ease;
  flex: 0 1 200px;
}

.search-box:focus-within {
  box-shadow: 0 0 0 3px rgba(230, 126, 34, 0.2);
  border-color: var(--accent);
}

body.dark-mode .search-box {
  background: var(--card-bg-dark);
  border-color: var(--border-dark);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 4px;
  outline: none;
  color: var(--text-light);
  font-size: 0.95rem;
  width: 100%;
}

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

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

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

.search-box button {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--brand-primary);
  font-size: 1.2rem;
  transition: transform 0.2s ease;
}

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

.theme-toggle {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  padding: 8px;
  border-radius: 50%;
  transition: all 0.3s ease;
  line-height: 1;
}

.theme-toggle:hover {
  background: rgba(230, 126, 34, 0.15);
  transform: rotate(15deg);
}

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

.menu-toggle {
  display: block;
  background: transparent;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text-light);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.menu-toggle:hover {
  background: rgba(0, 0, 0, 0.05);
}

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

body.dark-mode .menu-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-light);
  padding: 12px 20px;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 100;
  animation: slideDown 0.3s ease;
}

body.dark-mode .mobile-nav {
  background: var(--glass-bg-dark);
  border-top-color: var(--border-dark);
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  padding: 14px 0;
  color: var(--text-light);
  font-weight: 500;
  border-bottom: 1px solid var(--border-light);
  transition: all 0.2s ease;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  color: var(--accent);
  padding-left: 8px;
}

body.dark-mode .mobile-nav a {
  color: var(--text-dark);
  border-bottom-color: var(--border-dark);
}

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

/* ===== 按钮 ===== */
.btn-primary {
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 12px 28px;
  border-radius: var(--radius-full);
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
  box-shadow: 0 4px 12px rgba(44, 62, 80, 0.3);
  position: relative;
  overflow: hidden;
}

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

.btn-primary:hover {
  background: var(--btn-bg-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(44, 62, 80, 0.4);
}

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

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

body.dark-mode .btn-primary {
  background: #3B4A5A;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

body.dark-mode .btn-primary:hover {
  background: #2C3E50;
}

/* ===== 英雄区 ===== */
.hero {
  padding: 60px 0;
  background: var(--bg-hero-light);
  border-radius: 0 0 48px 48px;
  position: relative;
  overflow: hidden;
}

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

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(230, 126, 34, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

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

.hero-text h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body.dark-mode .hero-text h1 {
  background: linear-gradient(135deg, #F1F5F9 0%, #E67E22 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 1.15rem;
  color: var(--muted-light);
  margin-bottom: 24px;
  max-width: 500px;
}

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

.hero-image {
  flex: 1 1 300px;
  text-align: center;
  animation: float 6s ease-in-out infinite;
}

.hero-image svg {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.1));
}

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

/* ===== 卡片通用 ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid var(--border-light);
  box-shadow: var(--card-shadow);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--brand-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: rgba(230, 126, 34, 0.3);
}

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

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

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  font-weight: 700;
}

.card p {
  color: var(--muted-light);
  font-size: 0.95rem;
}

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

/* ===== 网格布局 ===== */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== 区块标题 ===== */
.section-title {
  font-size: 1.75rem;
  margin-bottom: 32px;
  position: relative;
  padding-left: 16px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 60%;
  background: var(--brand-gradient);
  border-radius: var(--radius-full);
}

body.dark-mode .section-title {
  color: var(--heading-dark);
}

/* ===== 文章卡片 ===== */
.article-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border-light);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(230, 126, 34, 0.05) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: rgba(230, 126, 34, 0.3);
}

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

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

.article-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  font-weight: 700;
  position: relative;
  z-index: 1;
}

.article-card .meta {
  color: var(--muted-light);
  font-size: 0.85rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  z-index: 1;
}

body.dark-mode .article-card .meta {
  color: var(--muted-dark);
}

.article-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

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

.read-more {
  color: var(--link-light);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  position: relative;
  z-index: 1;
  transition: gap 0.3s ease;
}

.read-more:hover {
  gap: 8px;
  color: var(--accent);
}

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

/* ===== FAQ ===== */
.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  border: 1px solid var(--border-light);
  margin-bottom: 16px;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(230, 126, 34, 0.3);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

body.dark-mode .faq-item {
  background: var(--card-bg-dark);
  border-color: var(--border-dark);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--heading-light);
  user-select: none;
}

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

.faq-icon {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--accent);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  margin-top: 12px;
  color: var(--text-light);
  line-height: 1.6;
  display: none;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}

.faq-item.active .faq-answer {
  display: block;
}

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

/* ===== 步骤卡片 ===== */
.step-card {
  background: var(--card-bg);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  position: relative;
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}

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

.step-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--accent);
  font-weight: 700;
}

.step-card p {
  color: var(--muted-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

body.dark-mode .step-card p {
  color: var(--muted-dark);
}

/* ===== 表格 ===== */
.table-container {
  overflow-x: auto;
  margin: 24px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

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

th,
td {
  padding: 14px 16px;
  border: 1px solid var(--border-light);
  text-align: left;
  font-size: 0.95rem;
}

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

th {
  background: #f3f4f6;
  color: #1F2937;
  font-weight: 700;
  white-space: nowrap;
}

body.dark-mode th {
  background: #374151;
  color: #F9FAFB;
}

tr:hover {
  background: rgba(230, 126, 34, 0.05);
}

/* ===== 统计数字 ===== */
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 4px;
}

body.dark-mode .stat-number {
  background: linear-gradient(135deg, #F1F5F9 0%, #E67E22 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 客户评价 ===== */
.testimonial {
  position: relative;
  padding: 28px;
}

.testimonial::before {
  content: '"';
  font-size: 5rem;
  color: var(--accent);
  opacity: 0.2;
  position: absolute;
  top: 10px;
  left: 20px;
  line-height: 1;
}

.testimonial p:first-child {
  font-size: 1rem;
  font-style: italic;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.testimonial .muted-text {
  font-size: 0.9rem;
  font-style: normal;
  font-weight: 600;
  position: relative;
  z-index: 1;
}

/* ===== 页脚 ===== */
.footer-bg {
  background: var(--brand-primary);
  color: #E2E8F0;
  padding: 48px 0 24px;
  margin-top: 48px;
  position: relative;
  overflow: hidden;
}

.footer-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), transparent, var(--accent));
}

body.dark-mode .footer-bg {
  background: #111827;
}

.footer-bg a {
  color: #B0C4DE;
  transition: color 0.2s ease;
}

.footer-bg a:hover {
  color: white;
  text-decoration: underline;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-grid h4 {
  color: white;
  margin-bottom: 16px;
  font-size: 1.1rem;
  font-weight: 700;
  position: relative;
  padding-bottom: 8px;
}

.footer-grid h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
}

.footer-grid p {
  color: #B0C4DE;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.copyright {
  text-align: center;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  color: #B0C4DE;
}

.copyright p {
  margin-bottom: 4px;
}

/* ===== 滚动动画 ===== */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--brand-gradient);
  color: white;
  padding: 12px 16px;
  border-radius: 50%;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 1000;
  display: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}

.back-to-top.show {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* ===== 响应式导航 ===== */
@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
  
  .menu-toggle {
    display: none;
  }
  
  .search-box {
    display: flex;
  }
  
  .mobile-nav {
    display: none !important;
  }
}

@media (max-width: 767px) {
  .nav-container {
    padding: 12px 16px;
  }
  
  .logo a {
    font-size: 1.5rem;
  }
  
  .hero {
    padding: 40px 0;
    border-radius: 0 0 32px 32px;
  }
  
  .hero-text h1 {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 20px;
  }
}

/* ===== 动画增强 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--brand-primary);
  border-radius: var(--radius-full);
}

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

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

/* ===== 选中文本样式 ===== */
::selection {
  background: rgba(230, 126, 34, 0.3);
  color: var(--text-light);
}

body.dark-mode ::selection {
  background: rgba(230, 126, 34, 0.5);
  color: var(--text-dark);
}

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

/* ===== 打印样式 ===== */
@media print {
  .navbar,
  .hero,
  .back-to-top,
  .theme-toggle,
  .menu-toggle,
  .mobile-nav {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card,
  .article-card,
  .faq-item,
  .step-card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* ===== 暗色模式下的额外优化 ===== */
body.dark-mode .hero-image svg {
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
}

body.dark-mode .card::after {
  background: linear-gradient(135deg, #E67E22 0%, #F39C12 100%);
}

/* ===== 响应式间距调整 ===== */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero-text h1 {
    font-size: 1.75rem;
  }
  
  .hero-text p {
    font-size: 1rem;
  }
  
  .btn-primary {
    padding: 10px 20px;
    font-size: 0.95rem;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .footer-grid {
    gap: 24px;
  }
}

/* ===== 无障碍支持 ===== */
.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;
}

/* ===== 工具类 ===== */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }

/* ===== 暗色模式过渡优化 ===== */
body,
body * {
  transition-property: background-color, border-color, color, box-shadow, transform;
  transition-duration: 0.3s;
  transition-timing-function: ease;
}
```