```css
/* ===== CSS变量与主题系统 ===== */
:root {
  --bg-1: #ffffff;
  --bg-2: #f0f4f8;
  --bg-3: #e2eaf2;
  --text-primary: #1a2b3c;
  --text-secondary: #3d566e;
  --text-heading: #0d1f2d;
  --text-link: #1a5d8f;
  --accent: #1a5d8f;
  --accent-light: #2d7ab5;
  --accent-dark: #0e3d5c;
  --btn-text: #ffffff;
  --footer-bg: #0d1f2d;
  --footer-text: #c8d6e5;
  --card-bg: rgba(255, 255, 255, 0.72);
  --border-light: rgba(0, 0, 0, 0.08);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.1);
  --gradient-hero: linear-gradient(135deg, #e8f0fe 0%, #d4e5f7 50%, #c0d9f0 100%);
  --gradient-accent: linear-gradient(135deg, #1a5d8f, #2d7ab5);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-1: #0f1923;
  --bg-2: #1a2733;
  --bg-3: #243542;
  --text-primary: #dce6f0;
  --text-secondary: #a0b4c6;
  --text-heading: #f0f5fa;
  --text-link: #6ab0e3;
  --accent: #4d9ed6;
  --accent-light: #7ab8e8;
  --accent-dark: #2d7ab5;
  --btn-text: #0f1923;
  --footer-bg: #0a1219;
  --footer-text: #8fa8b8;
  --card-bg: rgba(26, 39, 51, 0.8);
  --border-light: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(15, 25, 35, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --gradient-hero: linear-gradient(135deg, #16222e 0%, #1a2a38 50%, #1f3242 100%);
  --gradient-accent: linear-gradient(135deg, #4d9ed6, #7ab8e8);
}

/* ===== 基础重置与排版 ===== */
*, *::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', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-1);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.15rem; }

p {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

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

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

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

ul, ol {
  list-style-position: inside;
  padding-left: 1rem;
}

/* ===== 工具类 ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 4px;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.8rem;
  background: var(--gradient-accent);
  color: var(--btn-text) !important;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 15px rgba(26, 93, 143, 0.25);
  text-decoration: none !important;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(26, 93, 143, 0.35);
}

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

.tag {
  display: inline-block;
  padding: 0.2rem 0.8rem;
  background: var(--bg-3);
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

/* ===== 毛玻璃效果工具类 ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
}

/* ===== 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 var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 0;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
  text-decoration: none !important;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-menu a {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0.2rem;
  position: relative;
  text-decoration: none;
}

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

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

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-2);
  border-radius: 50px;
  padding: 0.4rem 0.4rem 0.4rem 1rem;
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
  max-width: 220px;
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 93, 143, 0.1);
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  width: 100%;
  font-size: 0.9rem;
}

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.search-box button {
  background: var(--gradient-accent);
  color: var(--btn-text);
  border: none;
  border-radius: 50px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.search-box button:hover {
  opacity: 0.9;
  transform: scale(0.98);
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
}

.icon-btn:hover {
  background: var(--bg-3);
  transform: rotate(10deg);
}

.menu-toggle {
  display: none;
}

/* 移动菜单 */
.mobile-menu {
  display: none;
  background: var(--glass-bg);
  padding: 1rem;
  border-top: 1px solid var(--border-light);
  backdrop-filter: blur(20px);
}

.mobile-menu a {
  display: block;
  padding: 0.8rem 1rem;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.mobile-menu a:hover {
  background: var(--bg-3);
  text-decoration: none;
}

/* ===== Hero区域 ===== */
.hero {
  background: var(--gradient-hero);
  padding: clamp(3rem, 8vw, 6rem) 0;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-light);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: heroFloat 8s ease-in-out infinite;
}

@keyframes heroFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 1.5rem;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--text-heading), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  max-width: 700px;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease-out 0.1s backwards;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
  animation: fadeInUp 0.8s ease-out 0.3s backwards;
}

.stat-item {
  text-align: center;
  padding: 1rem;
  background: var(--glass-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 卡片通用样式 ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

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

/* ===== 网格布局 ===== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* ===== 文章列表 ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.article-item {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
  position: relative;
  backdrop-filter: blur(10px);
}

.article-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-light);
}

.article-item h4 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  transition: color var(--transition-fast);
}

.article-item:hover h4 {
  color: var(--accent);
}

.meta {
  color: var(--text-secondary);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

/* ===== FAQ样式 ===== */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

details {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.5rem;
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

details:hover {
  border-color: var(--accent-light);
  box-shadow: var(--shadow-sm);
}

details[open] {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

summary {
  font-weight: 600;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  position: relative;
  padding-right: 1.5rem;
}

summary::after {
  content: '+';
  position: absolute;
  right: 0;
  font-size: 1.5rem;
  font-weight: 300;
  transition: transform var(--transition-normal);
  color: var(--accent);
}

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

details p {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-primary);
}

/* ===== HowTo 教程 ===== */
.howto-box {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.howto-box:hover {
  box-shadow: var(--shadow-lg);
}

.howto-box h3 {
  margin: 1.5rem 0 0.5rem;
  color: var(--accent);
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.howto-box h3:first-child {
  margin-top: 0;
}

.howto-box ol {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}

.howto-box ol li {
  padding: 0.3rem 0;
  color: var(--text-primary);
}

/* ===== Footer样式 ===== */
.footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 3rem 0 0;
  margin-top: 4rem;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding-bottom: 2rem;
}

.footer h3 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
}

.footer p {
  color: var(--footer-text);
  font-size: 0.9rem;
  line-height: 1.8;
}

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

.footer a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.85rem;
}

/* ===== 返回顶部按钮 ===== */
.backtop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--gradient-accent);
  color: var(--btn-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  border: none;
}

.backtop.show {
  opacity: 1;
  transform: translateY(0);
}

.backtop:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

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

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

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 800px) {
  .nav-menu {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .mobile-menu {
    display: none;
  }

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

  .grid-2,
  .faq-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .search-box {
    display: none;
  }

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

  .stat-number {
    font-size: 1.5rem;
  }

  .card {
    padding: 1.5rem;
  }

  .article-item {
    padding: 1.2rem;
  }

  .howto-box {
    padding: 1.5rem;
  }

  .backtop {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr;
  }

  .logo {
    font-size: 1.3rem;
  }

  .nav-wrapper {
    padding: 0.6rem 0;
  }

  .hero-title {
    font-size: 1.8rem;
  }

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

  .btn {
    padding: 0.6rem 1.4rem;
    font-size: 0.9rem;
  }
}

/* ===== 动画性能优化 ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-2);
}

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 4px;
}

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

/* ===== 文本选择颜色 ===== */
::selection {
  background: var(--accent);
  color: var(--btn-text);
}

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

/* ===== 打印样式 ===== */
@media print {
  .navbar,
  .backtop,
  .footer,
  .search-box,
  .icon-btn {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

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

/* ===== 区块间距优化 ===== */
main section {
  padding: 2rem 0;
}

main section:first-of-type {
  padding-top: 3rem;
}

main section:last-of-type {
  padding-bottom: 3rem;
}

/* ===== 链接美化 ===== */
a[href^="tel:"] {
  white-space: nowrap;
}

/* ===== 响应式字体 ===== */
html {
  font-size: 16px;
}

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

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
}

/* ===== 图片响应式 ===== */
img {
  max-width: 100%;
  height: auto;
}

/* ===== 联系区块样式 ===== */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.contact-info p {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--text-primary);
}

.contact-info .icon {
  font-size: 1.2rem;
  color: var(--accent);
}

/* ===== 版权信息样式 ===== */
.copyright {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 1rem 0;
  text-align: center;
  border-top: 1px solid var(--border-light);
  margin-top: 2rem;
}
```