```css
/* ===== 魅影直播 - 完整样式表 ===== */
/* 基础重置与设计变量 */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #334155;
  --text-heading: #0f172a;
  --text-link: #1e3a8a;
  --text-btn: #ffffff;
  --border-color: #d1d5db;
  --brand: #1e3a8a;
  --brand-soft: #2563eb;
  --nav-bg: rgba(255,255,255,0.92);
  --footer-bg: #0f172a;
  --footer-text: #cbd5e1;
  --shadow: 0 8px 30px rgba(0,0,0,0.05);
  --radius: 16px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-card: linear-gradient(120deg, rgba(255,255,255,0.9) 0%, rgba(248,250,252,0.95) 100%);
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(255,255,255,0.3);
  --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

[data-theme="dark"] {
  --bg: #0b1120;
  --bg-soft: #111827;
  --card-bg: #1e293b;
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-heading: #f8fafc;
  --text-link: #93c5fd;
  --text-btn: #0f172a;
  --border-color: #334155;
  --brand: #3b82f6;
  --brand-soft: #60a5fa;
  --nav-bg: rgba(15,23,42,0.9);
  --footer-bg: #020617;
  --footer-text: #94a3b8;
  --shadow: 0 10px 30px rgba(0,0,0,0.4);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  --gradient-card: linear-gradient(120deg, rgba(30,41,59,0.9) 0%, rgba(15,23,42,0.95) 100%);
  --glass-bg: rgba(15,23,42,0.7);
  --glass-border: rgba(255,255,255,0.1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-soft);
}
::-webkit-scrollbar-thumb {
  background: var(--brand);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--brand-soft);
}

/* 选择样式 */
::selection {
  background: var(--brand);
  color: #fff;
}

/* 层级清晰 */
h1, h2, h3, h4 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.02em;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-top: 2.5rem;
  border-left: 6px solid var(--brand);
  padding-left: 1rem;
  position: relative;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--gradient-hero);
  border-radius: 2px;
}

h3 {
  font-size: 1.4rem;
  margin-top: 1.8rem;
}

h4 {
  font-size: 1.15rem;
  margin-top: 1.2rem;
  color: var(--text-primary);
}

p {
  color: var(--text-primary);
  margin: 0.8rem 0;
}

a {
  color: var(--text-link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border 0.2s, color 0.2s;
}

a:hover {
  border-bottom-color: var(--text-link);
  color: var(--brand);
}

ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
}

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

/* 按钮样式 */
.btn {
  display: inline-block;
  background: var(--gradient-hero);
  color: #fff;
  padding: 0.85rem 2rem;
  border-radius: 60px;
  font-weight: 600;
  border: none;
  transition: var(--transition-smooth);
  cursor: pointer;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.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;
}

.btn:hover {
  background: var(--brand-soft);
  color: #fff;
  border: none;
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

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

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

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

/* 卡片样式 */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-hero);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s;
}

.card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

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

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition-smooth);
}

.navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 24px;
  max-width: 1280px;
  margin: 0 auto;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  transition: transform 0.3s;
}

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

.logo span {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-primary);
  border: none;
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-hero);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s;
}

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

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.theme-toggle, .menu-toggle {
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: transform 0.3s;
}

.theme-toggle:hover, .menu-toggle:hover {
  transform: rotate(15deg) scale(1.1);
}

.menu-toggle {
  display: none;
}

/* 移动菜单 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    padding: 1rem;
    position: absolute;
    top: 70px;
    left: 0;
    border-bottom: 1px solid var(--glass-border);
    gap: 1rem;
  }
  
  .nav-links.show {
    display: flex;
    animation: slideDown 0.3s ease;
  }
  
  .menu-toggle {
    display: block;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero 区域 */
.hero {
  background: var(--gradient-hero);
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 60%;
  height: 150%;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(3deg); }
}

.hero-grid {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-content {
  flex: 1 1 400px;
}

.hero-badge {
  background: rgba(255,255,255,0.2);
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: 30px;
  display: inline-block;
  font-weight: 500;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.3);
  animation: fadeInUp 0.6s ease;
}

.hero h1 {
  color: #fff;
  -webkit-text-fill-color: #fff;
  margin-bottom: 1.2rem;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero p {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.9);
  max-width: 600px;
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero-cta {
  margin-top: 2.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.6s both;
}

.hero .btn {
  background: #fff;
  color: var(--brand);
}

.hero .btn:hover {
  background: rgba(255,255,255,0.9);
  color: var(--brand);
}

.hero .btn-outline {
  background: transparent;
  border: 2px solid #fff;
  color: #fff;
}

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

.stats {
  display: flex;
  gap: 3rem;
  margin-top: 3rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.8s both;
}

.stat-item {
  text-align: center;
}

.stat-item h3 {
  font-size: 2.5rem;
  margin: 0;
  color: #fff;
  -webkit-text-fill-color: #fff;
}

.stat-item p {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
}

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

/* 网格布局 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2.5rem 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

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

.article-list li {
  border-bottom: 1px solid var(--border-color);
  padding: 1.2rem 0;
  transition: var(--transition-smooth);
  position: relative;
  padding-left: 1.5rem;
}

.article-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--brand);
  transition: transform 0.3s;
}

.article-list li:hover {
  padding-left: 2rem;
  background: var(--bg-soft);
}

.article-list li:hover::before {
  transform: translateX(5px);
}

.article-list a {
  font-weight: 600;
  font-size: 1.1rem;
  border: none;
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

/* FAQ 样式 */
details {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.2rem 1.5rem;
  margin-bottom: 1rem;
  transition: var(--transition-smooth);
}

details:hover {
  border-color: var(--brand);
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

details[open] {
  background: var(--card-bg);
  border-color: var(--brand);
}

summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--text-heading);
  transition: color 0.3s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

summary::after {
  content: '▾';
  transition: transform 0.3s;
  color: var(--brand);
}

details[open] summary::after {
  transform: rotate(180deg);
}

summary::marker {
  color: var(--brand);
}

summary:hover {
  color: var(--brand);
}

details p {
  margin-top: 0.8rem;
  color: var(--text-primary);
  animation: fadeIn 0.3s ease;
}

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

/* 表格 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

th, td {
  padding: 1rem 1.2rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

th {
  background: var(--bg-soft);
  color: var(--text-heading);
  font-weight: 600;
}

tr {
  transition: background 0.3s;
}

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

/* Footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-hero);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2rem;
}

footer h4, footer h3 {
  color: #f8fafc;
  margin-bottom: 1rem;
}

footer a {
  color: var(--footer-text);
  border: none;
  transition: color 0.3s, padding-left 0.3s;
  display: inline-block;
  padding: 0.2rem 0;
}

footer a:hover {
  color: #ffffff;
  padding-left: 8px;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  margin-top: 2rem;
  padding-top: 1.5rem;
  font-size: 0.9rem;
  text-align: center;
}

/* HowTo 步骤 */
.howto-steps {
  counter-reset: step;
  margin: 2rem 0;
}

.howto-step {
  position: relative;
  padding-left: 4rem;
  margin: 1.5rem 0;
  transition: var(--transition-smooth);
}

.howto-step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  background: var(--gradient-hero);
  color: #fff;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  transition: transform 0.3s;
}

.howto-step:hover::before {
  transform: scale(1.1) rotate(360deg);
}

.howto-step h4 {
  margin-top: 0;
}

/* 图片占位 */
.svg-placeholder {
  background: var(--bg-soft);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
}

.svg-placeholder:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow);
}

.lazy-img {
  min-height: 120px;
  background: linear-gradient(90deg, var(--bg-soft) 25%, var(--border-color) 50%, var(--bg-soft) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

.lazy-img.loaded {
  background: var(--bg-soft);
  animation: none;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 滚动动画 */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s, transform 0.8s;
}

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

/* 面包屑 */
.breadcrumb {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 1.5rem 0;
  padding: 0.8rem 1.2rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: 8px;
  border: 1px solid var(--glass-border);
}

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

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

/* 返回顶部 */
#backTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--gradient-hero);
  color: #fff;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  cursor: pointer;
  border: none;
  opacity: 0;
  visibility: hidden;
  z-index: 100;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  transition: all 0.4s;
}

#backTop.show {
  opacity: 1;
  visibility: visible;
}

#backTop:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: 0 8px 25px rgba(0,0,0,0.4);
}

/* 暗黑模式修正 */
[data-theme="dark"] .card,
[data-theme="dark"] details {
  background: var(--glass-bg);
}

[data-theme="dark"] .navbar {
  background: var(--glass-bg);
}

[data-theme="dark"] footer {
  background: var(--footer-bg);
}

[data-theme="dark"] .btn {
  color: #0f172a;
}

[data-theme="dark"] .hero-badge {
  color: #0f172a;
  background: rgba(255,255,255,0.9);
  border-color: rgba(0,0,0,0.1);
}

[data-theme="dark"] .hero h1,
[data-theme="dark"] .hero p,
[data-theme="dark"] .stat-item h3,
[data-theme="dark"] .stat-item p {
  color: #f8fafc;
  -webkit-text-fill-color: #f8fafc;
}

[data-theme="dark"] .hero .btn {
  background: var(--brand);
  color: #fff;
}

[data-theme="dark"] .hero .btn-outline {
  border-color: var(--brand);
  color: var(--brand);
}

[data-theme="dark"] .hero .btn-outline:hover {
  background: var(--brand);
  color: #fff;
}

[data-theme="dark"] .svg-placeholder {
  color: var(--text-secondary);
}

[data-theme="dark"] th {
  background: #1e293b;
}

[data-theme="dark"] .article-list li:hover {
  background: var(--bg-soft);
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero-grid {
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .hero {
    padding: 3rem 0;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .stats {
    gap: 1.5rem;
  }
  
  .stat-item h3 {
    font-size: 2rem;
  }
  
  .grid-3, .grid-2 {
    gap: 1.2rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .howto-step {
    padding-left: 3.5rem;
  }
  
  .howto-step::before {
    width: 2.2rem;
    height: 2.2rem;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.9rem;
  }
  
  .stats {
    gap: 1rem;
  }
  
  .stat-item h3 {
    font-size: 1.75rem;
  }
  
  #backTop {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
    bottom: 20px;
    right: 20px;
  }
}

/* 打印样式 */
@media print {
  .navbar, .theme-toggle, .menu-toggle, #backTop, .hero-cta, footer {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
  
  a {
    color: #000;
    text-decoration: underline;
  }
}

/* 无障碍 */
@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;
  }
}

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

/* 工具类 */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 2.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 2.5rem; }
```