```css
/* ===== 蓝颜TV 主样式表 ===== */
/* 设计语言：深色科技感 + 活力橙色点缀 */
/* 支持响应式 + 暗色模式 + 动画交互 */

/* ---------- 基础重置与变量 ---------- */
:root {
  --primary: #1a1a2e;
  --primary-light: #16213e;
  --accent: #f97316;
  --accent-hover: #fb923c;
  --accent-soft: rgba(249, 115, 22, 0.15);
  --bg: #f8fafc;
  --bg-dark: #0f172a;
  --card-bg: #ffffff;
  --card-bg-dark: #1e293b;
  --text: #1e293b;
  --text-light: #64748b;
  --text-dark: #e2e8f0;
  --text-muted-dark: #94a3b8;
  --border: #e2e8f0;
  --border-dark: #334155;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.1);
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.4s ease, color 0.4s ease;
}

img,
svg {
  max-width: 100%;
  vertical-align: middle;
}

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

ul,
ol {
  list-style: none;
}

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

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

::-webkit-scrollbar-track {
  background: transparent;
}

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

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

/* ---------- 吸顶导航 ---------- */
.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(26, 26, 46, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  transition: opacity 0.2s ease;
}

.logo:hover {
  opacity: 0.9;
}

.logo svg {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.3);
}

.menu {
  display: flex;
  gap: 32px;
  list-style: none;
}

.menu a {
  color: #e2e8f0;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 4px 0;
}

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

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

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

.search-box {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  padding: 4px 4px 4px 12px;
  border-radius: 40px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: border-color 0.3s ease;
}

.search-box:focus-within {
  border-color: var(--accent);
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: white;
  padding: 6px 8px;
  width: 160px;
  font-size: 0.9rem;
}

.search-box input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.search-box button {
  background: var(--accent);
  border: none;
  color: white;
  border-radius: 30px;
  padding: 6px 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

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

.burger {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

/* ---------- 主视觉Banner ---------- */
.hero {
  background: linear-gradient(145deg, #0f0f1f 0%, #1a1a2e 100%);
  padding: 64px 0 48px;
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-grid {
  display: flex;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-text {
  flex: 1 1 320px;
}

.hero-badge {
  display: inline-block;
  background: var(--accent-soft);
  padding: 6px 18px;
  border-radius: 40px;
  font-weight: 500;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero-text h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.hero-text h1 span {
  color: var(--accent);
  position: relative;
}

.hero-text p {
  margin: 12px 0 20px;
  font-size: 1.1rem;
  color: #cbd5e1;
  max-width: 480px;
}

.hero-text .domain {
  font-size: 0.9rem;
  color: #94a3b8;
  margin-top: 8px;
}

.hero-slider {
  flex: 1 1 320px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: 28px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.slide-item {
  display: none;
  animation: fadeSlide 0.5s ease;
}

.slide-item.active {
  display: block;
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-item h3 {
  font-size: 1.6rem;
  margin-bottom: 10px;
  color: var(--accent);
}

.slide-item p {
  color: #ddd;
  font-size: 1.05rem;
}

/* ---------- 数字动画区域 ---------- */
.stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin: 40px auto;
  flex-wrap: wrap;
  padding: 32px 24px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

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

.stat-item {
  text-align: center;
  min-width: 120px;
}

.stat-item .num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  display: inline-block;
}

.dark-mode .stat-item .num {
  color: var(--text-dark);
}

.stat-item .label {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-top: 4px;
}

/* ---------- 通用区块 ---------- */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin: 48px 0 28px;
  position: relative;
  display: inline-block;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 4px;
}

/* ---------- 网格布局 ---------- */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}

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

.card h4 {
  font-size: 1.2rem;
  margin-bottom: 14px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dark-mode .card h4 {
  color: var(--text-dark);
}

.card p {
  color: var(--text-light);
  margin-bottom: 12px;
  line-height: 1.8;
}

.card p:last-child {
  margin-bottom: 0;
}

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

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

/* ---------- 文章列表 ---------- */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.article-item {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 24px;
  border-left: 4px solid var(--accent);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.article-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-left-color: var(--accent-hover);
}

.article-item h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text);
  transition: color 0.2s ease;
}

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

.article-item .date {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 8px;
  display: block;
}

.article-item p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.article-item a {
  color: var(--accent);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

/* ---------- FAQ ---------- */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.faq-item {
  background: var(--card-bg);
  padding: 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}

.faq-item:hover {
  border-color: var(--accent-soft);
  box-shadow: var(--shadow-md);
}

.faq-item h4 {
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-size: 1rem;
}

.faq-item h4 span {
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 400;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.open h4 span {
  transform: rotate(180deg);
}

.faq-item p {
  display: none;
  margin-top: 14px;
  color: var(--text-light);
  line-height: 1.8;
  font-size: 0.95rem;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

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

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

/* ---------- HowTo ---------- */
.howto-box {
  background: var(--card-bg);
  padding: 32px;
  border-radius: var(--radius-lg);
  margin: 30px 0;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.howto-box h4 {
  font-size: 1.2rem;
  margin-bottom: 16px;
  color: var(--primary);
}

.dark-mode .howto-box h4 {
  color: var(--text-dark);
}

.howto-box p {
  color: var(--text-light);
  margin-bottom: 12px;
}

.howto-box ol {
  padding-left: 24px;
  margin: 16px 0;
  list-style: decimal;
}

.howto-box ol li {
  margin-bottom: 8px;
  color: var(--text);
  line-height: 1.8;
}

.dark-mode .howto-box ol li {
  color: var(--text-dark);
}

.howto-box strong {
  color: var(--accent);
}

/* ---------- 站点信息 ---------- */
.info-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  background: var(--card-bg);
  padding: 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.info-links a {
  color: var(--text-light);
  padding: 6px 16px;
  border-radius: 30px;
  border: 1px solid var(--border);
  transition: var(--transition);
  font-size: 0.9rem;
}

.info-links a:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.site-info {
  margin: 24px 0;
  color: var(--text-light);
  line-height: 2;
}

.site-info p {
  margin-bottom: 4px;
  font-size: 0.95rem;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  background: var(--accent);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  border: none;
  font-size: 1.4rem;
  box-shadow: 0 4px 16px rgba(249, 115, 22, 0.4);
  z-index: 999;
}

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

.back-to-top:hover {
  background: var(--accent-hover);
  transform: translateY(-4px);
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--primary);
  color: var(--text-muted-dark);
  padding: 48px 0 0;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  padding-bottom: 40px;
}

.footer h4 {
  color: white;
  margin-bottom: 16px;
  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(--accent);
}

.footer p {
  color: var(--text-muted-dark);
  line-height: 1.8;
  font-size: 0.95rem;
}

.footer a {
  color: #cbd5e1;
  transition: color 0.2s ease;
  font-size: 0.95rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-dark);
  padding: 24px 0;
  text-align: center;
  font-size: 0.9rem;
}

/* ---------- 暗色模式 ---------- */
body.dark-mode {
  background: var(--bg-dark);
  color: var(--text-dark);
}

body.dark-mode .card,
body.dark-mode .article-item,
body.dark-mode .faq-item,
body.dark-mode .howto-box {
  background: var(--card-bg-dark);
  color: var(--text-dark);
}

body.dark-mode .card p,
body.dark-mode .article-item p,
body.dark-mode .faq-item p,
body.dark-mode .howto-box p {
  color: var(--text-muted-dark);
}

body.dark-mode .card h4,
body.dark-mode .article-item h4,
body.dark-mode .faq-item h4 {
  color: var(--text-dark);
}

body.dark-mode .howto-box {
  border-color: var(--border-dark);
}

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

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

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

body.dark-mode .site-info {
  color: var(--text-muted-dark);
}

body.dark-mode .article-item a {
  color: var(--accent);
}

body.dark-mode .article-item a:hover {
  color: var(--accent-hover);
}

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

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

/* ---------- Hover 通用效果 ---------- */
.hover-lift {
  transition: var(--transition);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }

  .menu {
    gap: 20px;
  }

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

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

  .menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 62px;
    left: 0;
    width: 100%;
    background: var(--primary);
    padding: 24px;
    gap: 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .menu.open {
    display: flex;
  }

  .menu a {
    font-size: 1.1rem;
    padding: 8px 0;
  }

  .burger {
    display: block;
  }

  .search-box {
    display: none;
  }

  .hero {
    padding: 40px 0 32px;
  }

  .hero-grid {
    gap: 32px;
  }

  .hero-text h1 {
    font-size: 2rem;
  }

  .hero-slider {
    min-height: 200px;
    padding: 20px;
  }

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

  .stats {
    gap: 24px;
    padding: 24px 16px;
  }

  .stat-item .num {
    font-size: 2rem;
  }

  .section-title {
    margin-top: 40px;
  }

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

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

  .howto-box {
    padding: 24px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 1.6rem;
  }

  .hero-badge {
    font-size: 0.8rem;
  }

  .card {
    padding: 20px;
  }

  .article-item {
    padding: 18px;
  }

  .faq-item {
    padding: 18px;
  }

  .howto-box {
    padding: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .sticky-nav,
  .back-to-top,
  .search-box,
  .burger {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .hero {
    background: white;
    color: black;
    padding: 20px 0;
  }

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

/* ---------- 暗色模式滚动条 ---------- */
body.dark-mode::-webkit-scrollbar-thumb {
  background: var(--border-dark);
}

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

/* ---------- 辅助类 ---------- */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 8px;
}

.mt-4 {
  margin-top: 16px;
}

.mt-6 {
  margin-top: 24px;
}

.mb-4 {
  margin-bottom: 16px;
}

.hidden {
  display: none !important;
}

/* ---------- 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;
  }
}
```