```css
/* =========================================
   色多多 - 两性交友平台
   完整样式表 | bcqcura.cn
   风格：现代浪漫 · 渐变质感 · 毛玻璃效果
   ========================================= */

/* ---------- CSS变量（亮色/暗色主题） ---------- */
:root {
  --bg-light: #ffffff;
  --bg-soft: #f8fafc;
  --text-primary: #1f2937;
  --text-secondary: #334155;
  --text-muted: #475569;
  --brand-color: #e11d48;
  --brand-dark: #be123c;
  --brand-light: #fda4af;
  --border-light: #e2e8f0;
  --card-bg: #ffffff;
  --footer-bg: #1e293b;
  --footer-text: #e2e8f0;
  --nav-bg: rgba(255, 255, 255, 0.85);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);
  --gradient-main: linear-gradient(135deg, #e11d48 0%, #be123c 50%, #881337 100%);
  --gradient-soft: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-light: #0f172a;
  --bg-soft: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #e2e8f0;
  --text-muted: #cbd5e1;
  --brand-color: #fb7185;
  --brand-dark: #f43f5e;
  --brand-light: #fecdd3;
  --border-light: #334155;
  --card-bg: #1e293b;
  --footer-bg: #0b1120;
  --footer-text: #e2e8f0;
  --nav-bg: rgba(15, 23, 42, 0.9);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.5);
  --gradient-main: linear-gradient(135deg, #f43f5e 0%, #be123c 50%, #881337 100%);
  --gradient-soft: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

/* ---------- 全局重置与基础 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: var(--bg-light);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: background 0.3s, box-shadow 0.3s;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
  transition: transform 0.3s;
}

.logo:hover {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  position: relative;
  transition: color 0.2s, border-color 0.2s;
}

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

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

.nav-links 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-soft);
  border-radius: 30px;
  padding: 4px 4px 4px 16px;
  border: 1px solid var(--border-light);
  transition: box-shadow 0.3s, border-color 0.3s;
}

.search-box:focus-within {
  border-color: var(--brand-color);
  box-shadow: 0 0 0 3px rgba(225, 29, 72, 0.15);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 8px 0;
  width: 150px;
  color: var(--text-primary);
  outline: none;
  font-size: 0.9rem;
}

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

.search-box button {
  background: var(--brand-color);
  border: none;
  border-radius: 30px;
  padding: 8px 16px;
  color: white;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.3s, transform 0.2s;
}

.search-box button:hover {
  background: var(--brand-dark);
  transform: scale(1.05);
}

.theme-toggle {
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: 30px;
  padding: 8px 14px;
  color: var(--text-primary);
  font-weight: 500;
  font-size: 1rem;
  transition: all 0.3s;
}

.theme-toggle:hover {
  border-color: var(--brand-color);
  color: var(--brand-color);
  transform: rotate(15deg);
}

.mobile-menu {
  display: none;
  font-size: 1.8rem;
  color: var(--text-primary);
  padding: 4px 8px;
}

/* ---------- Banner区域 ---------- */
.banner {
  background: var(--gradient-main);
  color: white;
  padding: 5rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(255, 255, 255, 0.15) 0%,
    transparent 50%
  );
  animation: bannerGlow 8s ease-in-out infinite alternate;
}

@keyframes bannerGlow {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(5%, -5%);
  }
}

.banner .container {
  position: relative;
  z-index: 1;
}

.banner h1 {
  font-size: 3.4rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  margin-bottom: 0.5rem;
  animation: fadeInUp 0.8s ease-out;
}

.banner p {
  font-size: 1.4rem;
  margin-top: 1rem;
  opacity: 0.95;
  font-weight: 300;
  letter-spacing: 1px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.btn-group {
  margin-top: 2.5rem;
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.btn-primary {
  background: white;
  color: var(--brand-dark);
  padding: 0.9rem 2.4rem;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
  text-decoration: none;
  color: var(--brand-dark);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.8);
  padding: 0.8rem 2.4rem;
  border-radius: 50px;
  font-weight: 600;
  color: white;
  transition: all 0.3s;
  backdrop-filter: blur(4px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.2);
  text-decoration: none;
  color: white;
  transform: translateY(-3px);
}

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

/* ---------- 通用区块 ---------- */
.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
  border-left: 6px solid var(--brand-color);
  padding-left: 1.2rem;
  position: relative;
  letter-spacing: 1px;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 1.2rem;
  width: 40px;
  height: 3px;
  background: var(--brand-color);
  border-radius: 2px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

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

.card h3 {
  color: var(--text-primary);
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

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

.card strong {
  color: var(--text-primary);
}

.badge {
  background: var(--bg-soft);
  color: var(--brand-dark);
  padding: 0.3rem 1rem;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-block;
}

/* ---------- 文章卡片 ---------- */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.8rem;
}

.article-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 1.8rem;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transition: transform 0.4s;
}

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

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

.article-card h4 {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-weight: 600;
  transition: color 0.3s;
}

.article-card:hover h4 {
  color: var(--brand-color);
}

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

.article-card p {
  color: var(--text-secondary);
  margin: 0.75rem 0;
  font-size: 0.95rem;
}

.read-more {
  color: var(--brand-color);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.3s;
}

.read-more:hover {
  gap: 8px;
  text-decoration: none;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 1.2rem 0;
  transition: background 0.3s;
}

.faq-item:first-child {
  border-top: 1px solid var(--border-light);
}

.faq-question {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  transition: color 0.3s;
}

.faq-question:hover {
  color: var(--brand-color);
}

.faq-question span {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: background 0.3s, transform 0.3s;
  flex-shrink: 0;
}

.faq-question:hover span {
  background: var(--brand-color);
  color: white;
}

.faq-answer {
  color: var(--text-secondary);
  margin-top: 0.8rem;
  line-height: 1.8;
  padding-left: 1rem;
  border-left: 3px solid var(--brand-color);
  animation: fadeIn 0.3s ease-out;
}

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

/* ---------- HowTo步骤 ---------- */
.howto-steps {
  counter-reset: step;
  max-width: 800px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 1.2rem;
  margin-bottom: 1.2rem;
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  transition: transform 0.3s, box-shadow 0.3s;
}

.step:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  background: var(--brand-color);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: 0 4px 8px rgba(225, 29, 72, 0.3);
}

.step div {
  flex: 1;
}

.step strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 0.3rem;
}

/* ---------- 表格 ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
}

th,
td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

th {
  background: var(--bg-soft);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
}

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

tr:hover td {
  background: var(--bg-soft);
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer a {
  color: #cbd5e1;
  transition: color 0.3s;
}

.footer a:hover {
  color: white;
  text-decoration: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer h5 {
  color: white;
  font-size: 1.1rem;
  margin-bottom: 1.2rem;
  font-weight: 600;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer h5::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--brand-color);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.footer-links a {
  font-size: 0.9rem;
  opacity: 0.85;
  transition: opacity 0.3s, padding-left 0.3s;
}

.footer-links a:hover {
  opacity: 1;
  padding-left: 6px;
}

.copyright {
  border-top: 1px solid #334155;
  padding-top: 1.8rem;
  text-align: center;
  color: #94a3b8;
  font-size: 0.9rem;
}

.copyright p {
  margin-bottom: 0.3rem;
}

/* ---------- 返回顶部按钮 ---------- */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--brand-color);
  color: white;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.3rem;
  cursor: pointer;
  box-shadow: 0 8px 16px rgba(225, 29, 72, 0.4);
  transition: all 0.3s;
  z-index: 99;
  display: none;
  align-items: center;
  justify-content: center;
}

#backToTop:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 24px rgba(225, 29, 72, 0.5);
  background: var(--brand-dark);
}

/* ---------- 滚动显示动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ---------- 移动端适配 ---------- */
@media (max-width: 992px) {
  .nav-links {
    gap: 1.5rem;
  }

  .search-box input {
    width: 120px;
  }
}

@media (max-width: 768px) {
  .nav-inner {
    height: 60px;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    padding: 1.5rem;
    gap: 0.8rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow);
    animation: slideDown 0.3s ease-out;
  }

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

  .nav-links li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-light);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

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

  .mobile-menu {
    display: block;
  }

  .search-box {
    display: none;
  }

  .banner {
    padding: 3.5rem 0;
  }

  .banner h1 {
    font-size: 2.2rem;
  }

  .banner p {
    font-size: 1.1rem;
  }

  .section {
    padding: 3rem 0;
  }

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

  .card {
    padding: 1.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .banner h1 {
    font-size: 1.8rem;
  }

  .btn-group {
    flex-direction: column;
    gap: 0.8rem;
  }

  .btn-primary,
  .btn-outline {
    width: 100%;
    text-align: center;
  }

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

  .article-list {
    grid-template-columns: 1fr;
  }

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

  .step {
    flex-direction: column;
    gap: 0.8rem;
  }

  .step::before {
    width: 32px;
    height: 32px;
  }
}

/* ---------- 打印优化 ---------- */
@media print {
  .nav,
  .banner,
  .footer,
  #backToTop,
  .theme-toggle,
  .mobile-menu,
  .search-box {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* ---------- 自定义滚动条 ---------- */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--brand-color);
  border-radius: 5px;
}

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

::selection {
  background: var(--brand-color);
  color: white;
}

/* ---------- 焦点可见性 ---------- */
:focus-visible {
  outline: 3px solid var(--brand-color);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 减少动效 ---------- */
@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;
  }
}
```