```css
/* =============================================
   色色撸恋爱网 - 完整样式表
   设计风格：现代浪漫 · 渐变 · 毛玻璃 · 响应式
   版本：1.0
   ============================================= */

/* ===== CSS变量（主题系统） ===== */
:root {
  /* 亮色模式 */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --bg-footer: #1e293b;
  --bg-hero: linear-gradient(135deg, #e0e7ff 0%, #f1f5f9 100%);
  
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-footer: #e2e8f0;
  
  --border-color: #e2e8f0;
  --border-light: rgba(148, 163, 184, 0.2);
  
  --brand-primary: #1a3a5c;
  --brand-secondary: #3b82f6;
  --brand-gradient: linear-gradient(135deg, #1a3a5c 0%, #3b82f6 100%);
  
  --btn-primary: #1a3a5c;
  --btn-primary-hover: #0f2b44;
  --btn-text: #ffffff;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;
  
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* 暗色模式变量覆盖 */
body.dark-mode {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-nav: rgba(15, 23, 42, 0.9);
  --bg-footer: #0b1120;
  --bg-hero: linear-gradient(135deg, #1e1b3a 0%, #0f172a 100%);
  
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-footer: #cbd5e1;
  
  --border-color: #334155;
  --border-light: rgba(148, 163, 184, 0.15);
  
  --brand-primary: #7aa2f7;
  --brand-secondary: #3b82f6;
  --brand-gradient: linear-gradient(135deg, #7aa2f7 0%, #3b82f6 100%);
  
  --btn-primary: #3b82f6;
  --btn-primary-hover: #2563eb;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
}

/* ===== 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: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

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

a {
  color: var(--brand-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

a:hover,
a:focus {
  color: var(--brand-secondary);
  text-decoration: underline;
}

body.dark-mode a {
  color: #93c5fd;
}

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

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5em;
}

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

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4,
body.dark-mode h5,
body.dark-mode h6 {
  color: #ffffff;
}

body.dark-mode p,
body.dark-mode li,
body.dark-mode span,
body.dark-mode div {
  color: var(--text-primary);
}

ul, ol {
  padding-left: 1.5rem;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ===== 布局容器 ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

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

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

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 1px;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

body.dark-mode .logo {
  background: linear-gradient(135deg, #7aa2f7, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-weight: 600;
  padding: 8px 4px;
  border-radius: var(--radius-sm);
  position: relative;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

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

.nav-links a:hover {
  color: var(--brand-primary);
  text-decoration: none;
}

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

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

.menu-toggle:hover {
  background-color: var(--border-light);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  background-color: var(--bg-card);
  padding: 16px 24px;
  gap: 8px;
  border-top: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
}

.mobile-menu a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--text-primary);
  transition: background-color 0.2s ease;
}

.mobile-menu a:hover {
  background-color: var(--border-light);
  text-decoration: none;
}

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

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  background-color: var(--btn-primary);
  color: var(--btn-text);
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.btn::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:hover {
  background-color: var(--btn-primary-hover);
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

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

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--brand-primary);
  color: var(--brand-primary);
}

.btn-outline:hover {
  background-color: var(--brand-primary);
  color: #ffffff;
}

body.dark-mode .btn-outline {
  border-color: #7aa2f7;
  color: #7aa2f7;
}

body.dark-mode .btn-outline:hover {
  background-color: #7aa2f7;
  color: #0f172a;
}

/* ===== Hero区域 ===== */
.hero {
  background: var(--bg-hero);
  padding: 80px 0;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.6rem;
  margin-bottom: 20px;
  line-height: 1.2;
  background: linear-gradient(135deg, #1a3a5c 0%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body.dark-mode .hero h1 {
  background: linear-gradient(135deg, #7aa2f7, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 600px;
}

.hero .btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--brand-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--brand-secondary);
}

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

.card h3 {
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* ===== 文章列表 ===== */
.article-list {
  display: grid;
  gap: 16px;
}

.article-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: all 0.3s ease;
}

.article-item:hover {
  border-color: var(--brand-secondary);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.article-item h3 {
  margin-bottom: 4px;
  font-size: 1.05rem;
}

.article-item h3 a {
  color: var(--text-primary);
  transition: color 0.2s ease;
}

.article-item h3 a:hover {
  color: var(--brand-primary);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== FAQ样式 ===== */
.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: var(--brand-secondary);
}

.faq-item.open {
  border-color: var(--brand-secondary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
  transition: background-color 0.2s ease;
  user-select: none;
}

.faq-question:hover {
  background-color: var(--bg-secondary);
}

.faq-question span {
  font-size: 1.2rem;
  color: var(--brand-secondary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-question span {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 18px;
  color: var(--text-secondary);
  display: none;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

/* ===== 表格样式 ===== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.info-table th,
.info-table td {
  padding: 14px 16px;
  border: 1px solid var(--border-light);
  text-align: left;
}

.info-table th {
  background-color: var(--bg-secondary);
  font-weight: 700;
  color: var(--text-primary);
}

.info-table td {
  color: var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer {
  background-color: var(--bg-footer);
  color: var(--text-footer);
  padding: 60px 0 24px;
  margin-top: 80px;
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer h4 {
  color: #ffffff;
  margin-bottom: 20px;
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 8px;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--brand-gradient);
}

.footer-links {
  list-style: none;
  padding: 0;
  line-height: 2.2;
}

.footer-links a {
  color: var(--text-footer);
  opacity: 0.8;
  transition: all 0.2s ease;
}

.footer-links a:hover {
  opacity: 1;
  color: #ffffff;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.mt-4 { margin-top: 24px; }
.mb-4 { margin-bottom: 24px; }
.pt-4 { padding-top: 24px; }

/* ===== 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);
}

/* 卡片延迟动画 */
.card-grid .card:nth-child(1) { transition-delay: 0.05s; }
.card-grid .card:nth-child(2) { transition-delay: 0.1s; }
.card-grid .card:nth-child(3) { transition-delay: 0.15s; }
.card-grid .card:nth-child(4) { transition-delay: 0.2s; }

/* ===== 返回顶部按钮 ===== */
#backTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: #ffffff;
  font-size: 20px;
  border: none;
  cursor: pointer;
  display: none;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  transition: all 0.3s ease;
  align-items: center;
  justify-content: center;
}

#backTop:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 24px rgba(0,0,0,0.2);
}

/* ===== 暗色模式切换按钮 ===== */
#darkModeToggle {
  padding: 8px 16px;
  font-size: 0.9rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

#darkModeToggle:hover {
  background-color: var(--border-light);
  transform: scale(1.02);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .hero {
    padding: 48px 0;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .btn-group {
    flex-direction: column;
    gap: 12px;
  }
  
  .btn {
    width: 100%;
  }
  
  .info-table {
    font-size: 0.85rem;
  }
  
  .info-table th,
  .info-table td {
    padding: 10px 8px;
  }
  
  #backTop {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.2rem;
  }
  
  .nav-container {
    height: 64px;
  }
  
  .hero h1 {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 20px;
  }
}

/* ===== 打印优化 ===== */
@media print {
  .navbar,
  .footer,
  #backTop,
  .btn {
    display: none !important;
  }
  
  body {
    background-color: #ffffff;
    color: #000000;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
}

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

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

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

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

/* ===== 选中文本样式 ===== */
::selection {
  background-color: var(--brand-primary);
  color: #ffffff;
}

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

/* ===== 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;
  }
}
```