```css
/* ===== 天美传媒 · 全站样式表 ===== */
/* 风格：现代影视/深蓝品牌色 · 毛玻璃质感 · 响应式 */

/* ---------- 全局变量与主题 ---------- */
:root {
  --bg: #f7fafc;
  --bg-card: #ffffff;
  --bg-soft: #eef2f6;
  --text-primary: #17202A;
  --text-secondary: #2c3e50;
  --text-muted: #3e4c5a;
  --heading-color: #0f2b3d;
  --accent: #1d4e6f;
  --accent-dark: #0f3b5e;
  --accent-glow: rgba(29, 78, 111, 0.15);
  --button-text: #ffffff;
  --border-color: #cbd5e0;
  --footer-bg: #102a38;
  --footer-text: #dce7f0;
  --footer-heading: #ffffff;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
  --glass-bg: rgba(255,255,255,0.65);
  --glass-border: rgba(255,255,255,0.4);
  --gradient-hero: linear-gradient(145deg, #e8f0f7 0%, #d4e2f0 45%, #b8d0e8 100%);
  --gradient-card: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-soft) 100%);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-full: 60px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

[data-theme="dark"] {
  --bg: #0f1a22;
  --bg-card: #1a2730;
  --bg-soft: #1e2d38;
  --text-primary: #E5E7EB;
  --text-secondary: #C9D4DE;
  --text-muted: #A0B0BE;
  --heading-color: #ffffff;
  --accent: #7ab7d4;
  --accent-dark: #a8d4ea;
  --accent-glow: rgba(122, 183, 212, 0.2);
  --button-text: #0f1a22;
  --border-color: #2d4457;
  --footer-bg: #0b141c;
  --footer-text: #b8cbd9;
  --footer-heading: #ffffff;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.3);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.4);
  --glass-bg: rgba(26, 39, 48, 0.7);
  --glass-border: rgba(255,255,255,0.08);
  --gradient-hero: linear-gradient(145deg, #15222c 0%, #1b2d39 50%, #213849 100%);
  --gradient-card: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-soft) 100%);
}

/* ---------- 基础重置与排版 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.75;
  transition: background 0.4s ease, color 0.3s ease;
  font-size: 16px;
  word-break: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  color: var(--heading-color);
  font-weight: 650;
  line-height: 1.3;
  margin: 0.5em 0 0.3em;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin-top: 0.2em;
  background: linear-gradient(120deg, var(--heading-color) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.4rem;
  margin-top: 3rem;
  position: relative;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent);
  border-radius: 3px;
}

h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  margin-top: 2rem;
  color: var(--text-secondary);
}

h4 {
  font-size: 1.15rem;
  color: var(--accent);
}

p {
  color: var(--text-primary);
  margin: 1.2rem 0;
  line-height: 1.8;
}

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

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

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

ul, ol {
  padding-left: 1.8rem;
  margin: 1.2rem 0;
  color: var(--text-primary);
}

li {
  margin: 0.5rem 0;
}

strong {
  color: var(--text-primary);
  font-weight: 650;
}

::selection {
  background: var(--accent);
  color: var(--button-text);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 8px;
  border: 2px solid var(--bg-soft);
}

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

/* ---------- 容器与通用 ---------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- 毛玻璃效果辅助 ---------- */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
}

/* ---------- 头部导航 ---------- */
.site-header {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 2rem;
  max-width: 1320px;
  margin: 0 auto;
}

.brand a {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--heading-color);
  letter-spacing: -0.5px;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand a:hover {
  text-decoration: none;
  filter: brightness(1.1);
}

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

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s ease;
  position: relative;
}

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

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

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

.theme-toggle {
  background: var(--bg-soft);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 1rem;
  border-radius: 40px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}

.theme-toggle:hover {
  background: var(--accent);
  color: var(--button-text);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.8rem;
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.menu-toggle:hover {
  background: var(--bg-soft);
}

/* ---------- Hero 区域 ---------- */
.hero {
  background: var(--gradient-hero);
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

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

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

.hero-text {
  flex: 1 1 50%;
  min-width: 320px;
}

.hero-text h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-text p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
}

.hero-visual {
  flex: 1 1 40%;
  min-width: 300px;
  position: relative;
}

.hero-visual svg {
  box-shadow: var(--shadow-lg);
  transition: transform 0.5s ease;
}

.hero-visual svg:hover {
  transform: translateY(-8px) rotate(1deg);
}

/* ---------- 按钮 ---------- */
.btn {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--button-text);
  border: none;
  padding: 0.9rem 2.2rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: inline-block;
  transition: all 0.3s ease;
  box-shadow: 0 4px 16px var(--accent-glow);
  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 {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
  color: var(--button-text);
  text-decoration: none;
}

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

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

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

.card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  border: 1px solid var(--glass-border);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

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

.card h3 {
  color: var(--heading-color);
  margin-top: 0.5rem;
  font-size: 1.3rem;
}

.card h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

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

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
}

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

th {
  background: var(--bg-soft);
  color: var(--heading-color);
  font-weight: 650;
  letter-spacing: 0.02em;
}

tr:last-child td {
  border-bottom: none;
}

tr {
  transition: background 0.2s ease;
}

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

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.5rem;
  margin: 1.2rem 0;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

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

.faq-question {
  font-weight: 650;
  color: var(--heading-color);
  font-size: 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  padding: 0.3rem 0;
  transition: color 0.2s ease;
  font-family: inherit;
}

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

.faq-question span {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--accent);
}

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

.faq-answer {
  margin-top: 0.8rem;
  color: var(--text-primary);
  border-top: 1px solid var(--border-color);
  padding-top: 0.8rem;
  line-height: 1.8;
}

/* ---------- 文章列表 ---------- */
.article-list {
  list-style: none;
  padding-left: 0;
}

.article-list li {
  border-bottom: 1px solid var(--border-color);
  padding: 1.2rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  transition: all 0.3s ease;
}

.article-list li:hover {
  padding-left: 1rem;
  border-color: var(--accent);
}

.article-list a {
  font-weight: 600;
  font-size: 1.05rem;
  transition: color 0.2s ease;
}

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

.meta-date {
  color: var(--text-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

/* ---------- 高亮区块 ---------- */
.highlight-block {
  background: var(--gradient-card);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.highlight-block::before {
  content: '"';
  position: absolute;
  top: -20px;
  left: 20px;
  font-size: 120px;
  color: var(--accent);
  opacity: 0.1;
  font-family: Georgia, serif;
}

/* ---------- 联系区块 ---------- */
.contact-block {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.contact-block > div {
  flex: 1;
  min-width: 250px;
}

.contact-block p {
  margin: 0.6rem 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.footer a {
  color: var(--footer-text);
  transition: color 0.2s ease, text-decoration 0.2s ease;
}

.footer a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.footer h4 {
  color: var(--footer-heading);
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.footer p, .footer li {
  color: var(--footer-text);
  font-size: 0.95rem;
}

.footer ul {
  list-style: none;
  padding-left: 0;
}

.footer ul li {
  margin: 0.4rem 0;
}

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

.footer .copyright {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.9rem;
  color: var(--footer-text);
}

/* ---------- 返回顶部 ---------- */
.backtop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 700;
  border: none;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

.backtop.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.backtop:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ---------- 滚动动画 ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-on-scroll {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .container {
    padding: 0 1.5rem;
  }

  .nav-wrap {
    padding: 0.8rem 1.5rem;
  }

  .hero {
    padding: 3rem 0;
  }

  .hero-content {
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .nav-wrap {
    padding: 0.6rem 1rem;
  }

  .brand a {
    font-size: 1.5rem;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--border-color);
    gap: 1rem;
    animation: fadeIn 0.3s ease;
  }

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

  .menu-toggle {
    display: block;
  }

  .hero {
    padding: 2.5rem 0;
  }

  .hero-content {
    flex-direction: column;
    text-align: center;
  }

  .hero-text p {
    margin: 0 auto;
  }

  .hero-visual {
    width: 100%;
  }

  .hero-visual svg {
    width: 100%;
    height: auto;
    min-height: 180px;
  }

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

  .article-list li {
    flex-direction: column;
    align-items: flex-start;
  }

  .backtop {
    bottom: 1.5rem;
    right: 1.5rem;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  .card {
    padding: 1.5rem;
  }

  .highlight-block,
  .contact-block {
    padding: 1.5rem;
  }

  .btn {
    padding: 0.8rem 1.6rem;
    font-size: 0.95rem;
  }
}

/* ---------- 无障碍与打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .backtop,
  .theme-toggle,
  .menu-toggle {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card,
  .faq-item {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}

/* ---------- 工具类 ---------- */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

/* ---------- 图片与媒体 ---------- */
img,
video {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

svg text {
  font-family: var(--font-sans);
  font-weight: 500;
}

/* ---------- 聚焦可见性 ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 渐变横幅占位 ---------- */
.banner-gradient {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.banner-gradient::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
```