```css
/* ===== 樱花视频 全站样式 v1.0 ===== */
/* 设计语言：柔美渐变 + 玻璃拟态 + 圆润卡片 */
/* 支持暗色模式 / 响应式 / 滚动动画 / hover动效 */

/* ---------- 基础重置 & 变量 ---------- */
:root {
  --primary: #ff4d6d;
  --primary-light: #ff7d9a;
  --primary-dark: #d63354;
  --accent: #ffd6e0;
  --bg: #f8f9fc;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.92);
  --bg-input: rgba(0, 0, 0, 0.05);
  --text: #1e1e2f;
  --text-muted: #666666;
  --text-light: #777777;
  --border: #e5e5f0;
  --shadow: 0 8px 20px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 12px 30px rgba(255, 77, 109, 0.15);
  --glass: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.4);
  --footer-bg: #14141f;
  --footer-text: #aaa;
  --footer-heading: #ffffff;
  --radius: 20px;
  --radius-sm: 16px;
  --transition: 0.3s ease;
}

body.dark {
  --bg: #12121c;
  --bg-card: #1d1d30;
  --bg-nav: rgba(18, 18, 28, 0.92);
  --bg-input: rgba(255, 255, 255, 0.1);
  --text: #e0e0e0;
  --text-muted: #aaa;
  --text-light: #999;
  --border: #2a2a3a;
  --shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 12px 30px rgba(255, 77, 109, 0.25);
  --glass: rgba(30, 30, 48, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --footer-bg: #0a0a12;
  --footer-text: #888;
  --footer-heading: #e0e0e0;
}

* {
  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, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  border: 2px solid var(--bg);
}

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

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

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: background 0.3s, box-shadow 0.3s;
}

body.dark .nav {
  background: var(--bg-nav);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 2px 4px rgba(255, 77, 109, 0.3));
  transition: transform 0.3s;
}

.logo:hover svg {
  transform: rotate(10deg) scale(1.05);
}

.nav-links {
  display: flex;
  gap: 28px;
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-links a {
  position: relative;
  color: inherit;
  text-decoration: none;
  padding: 6px 0;
  transition: color 0.3s;
}

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

.nav-links a:hover {
  color: var(--primary);
}

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border-radius: 40px;
  padding: 4px 12px;
  transition: background 0.3s, box-shadow 0.3s;
  border: 1px solid transparent;
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 77, 109, 0.1);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 8px;
  width: 160px;
  outline: none;
  color: inherit;
  font-size: 0.9rem;
}

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

.search-box button {
  background: none;
  border: 0;
  cursor: pointer;
  font-size: 1.2rem;
  padding: 4px 8px;
  transition: transform 0.2s;
}

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

.dark-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 30px;
  padding: 6px 14px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.85rem;
  color: inherit;
  transition: all 0.3s;
  white-space: nowrap;
}

.dark-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255, 77, 109, 0.05);
}

.menu-btn {
  display: none;
  background: none;
  border: 0;
  font-size: 1.8rem;
  cursor: pointer;
  color: inherit;
  line-height: 1;
  padding: 4px;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  font-size: 0.9rem;
  padding: 16px 0;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.3s;
}

.breadcrumb a:hover {
  color: var(--primary-dark);
}

/* ---------- 标题层级 ---------- */
h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin: 20px 0 12px;
  line-height: 1.3;
  background: linear-gradient(135deg, var(--primary), #ff8fa3);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.9rem;
  font-weight: 700;
  margin: 40px 0 16px;
  border-left: 6px solid var(--primary);
  padding-left: 16px;
  line-height: 1.3;
}

h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 24px 0 12px;
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 16px 0 8px;
}

/* ---------- Hero区域 ---------- */
.hero {
  background: linear-gradient(135deg, #fff0f3 0%, #ffe6eb 100%);
  border-radius: 32px;
  padding: 40px;
  margin: 20px 0 30px;
  position: relative;
  overflow: hidden;
  transition: background 0.3s;
}

body.dark .hero {
  background: linear-gradient(135deg, #1e1e30 0%, #2a2a40 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 77, 109, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-text {
  flex: 2;
  min-width: 280px;
}

.hero-text p {
  font-size: 1.2rem;
  margin: 16px 0;
  color: var(--text);
}

.cta-btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  padding: 14px 32px;
  border-radius: 60px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s;
  box-shadow: 0 4px 15px rgba(255, 77, 109, 0.3);
  position: relative;
  overflow: hidden;
}

.cta-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;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 77, 109, 0.4);
}

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

.hero-visual {
  flex: 1;
  min-width: 240px;
  text-align: center;
}

.hero-visual svg {
  filter: drop-shadow(0 8px 20px rgba(255, 77, 109, 0.1));
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  margin: 24px 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(255, 77, 109, 0.1);
}

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

.card h3 {
  margin-top: 0;
  font-size: 1.2rem;
}

.card h4 {
  color: var(--primary);
  margin-bottom: 10px;
}

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

.card svg {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  transition: transform 0.3s;
}

.card:hover svg {
  transform: scale(1.1) rotate(5deg);
}

/* ---------- 双列布局 ---------- */
.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* ---------- 文章列表 ---------- */
.article-list {
  list-style: none;
}

.article-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.3s;
}

.article-list li:hover {
  padding-left: 10px;
  border-bottom-color: var(--primary);
}

.article-list a {
  color: inherit;
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  transition: color 0.3s;
  display: block;
}

.article-list a:hover {
  color: var(--primary);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 6px;
  display: flex;
  gap: 10px;
  align-items: center;
}

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin: 16px 0;
  padding: 0 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
  transition: box-shadow 0.3s, transform 0.3s;
  border: 1px solid transparent;
}

.faq-item:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
}

.faq-item.open {
  border-color: rgba(255, 77, 109, 0.2);
  box-shadow: 0 8px 20px rgba(255, 77, 109, 0.08);
}

.faq-q {
  padding: 18px 0;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.05rem;
  user-select: none;
}

.faq-q::after {
  content: '+';
  font-size: 1.8rem;
  font-weight: 300;
  transition: 0.3s;
  color: var(--primary);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-q::after {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-item.open .faq-a {
  max-height: 500px;
  padding-bottom: 18px;
}

/* ---------- HowTo 指南 ---------- */
.howto-box {
  background: var(--bg-card);
  border-radius: 24px;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s;
}

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

.howto-box h4 {
  color: var(--primary);
  margin-top: 20px;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.howto-box p {
  color: var(--text-muted);
  margin: 8px 0;
  line-height: 1.8;
}

/* ---------- 页脚 ---------- */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 40px 0;
  margin-top: 50px;
  position: relative;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.footer-grid h4 {
  color: var(--footer-heading);
  font-size: 1rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 8px;
}

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

.footer-grid a {
  display: block;
  color: var(--footer-text);
  text-decoration: none;
  margin: 8px 0;
  font-size: 0.9rem;
  transition: color 0.3s, padding-left 0.3s;
}

.footer-grid a:hover {
  color: var(--primary-light);
  padding-left: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 30px;
  padding-top: 20px;
  text-align: center;
  font-size: 0.9rem;
}

body.dark .footer-bottom {
  border-top-color: rgba(255, 255, 255, 0.05);
}

/* ---------- 返回顶部 ---------- */
.top-btn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  border: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.6rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 999;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.top-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(255, 77, 109, 0.4);
}

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.6rem;
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--border);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .menu-btn {
    display: block;
  }
  
  .search-box {
    display: none;
  }
  
  .hero {
    padding: 24px;
    border-radius: 24px;
  }
  
  .hero-grid {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-text p {
    font-size: 1rem;
  }
  
  .split-grid {
    grid-template-columns: 1fr;
  }
  
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
  }
  
  h1 {
    font-size: 1.6rem;
  }
  
  h2 {
    font-size: 1.3rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  
  .top-btn {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.3rem;
  }
  
  .dark-toggle {
    padding: 4px 10px;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero {
    padding: 20px;
  }
  
  .cta-btn {
    padding: 12px 24px;
    font-size: 0.95rem;
  }
  
  .breadcrumb {
    font-size: 0.8rem;
  }
}

/* ---------- 暗色模式细节优化 ---------- */
body.dark .card {
  background: var(--bg-card);
}

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

body.dark .howto-box {
  background: var(--bg-card);
}

body.dark input::placeholder {
  color: #888;
}

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

/* ---------- 打印样式 ---------- */
@media print {
  .nav, .footer, .top-btn, .dark-toggle, .menu-btn, .search-box {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  
  .reveal {
    opacity: 1;
    transform: none;
  }
}
```