```css
/* ---------- 重置与变量 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-page: #f7f9fc;
  --bg-card: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.85);
  --bg-footer: #1a2634;
  --text-primary: #1e2a3a;
  --text-secondary: #2e405b;
  --text-heading: #0f1a2b;
  --text-link: #0b4f6c;
  --border-light: #d8e1ea;
  --brand-main: #3b6ea5;
  --brand-dark: #1f4a7a;
  --brand-accent: #e67e22;
  --btn-bg: #1f4a7a;
  --btn-text: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.9);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  --footer-text: #e2e8f0;
  --footer-heading: #ffffff;
  --gradient-hero: linear-gradient(145deg, #3b6ea5, #1f4a7a, #142d4c);
  --gradient-section: linear-gradient(135deg, #e8f0fe, #f9fbfd);
  --card-hover-transform: translateY(-6px);
  --card-hover-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
  --transition-base: all 0.3s ease;
}

.dark-mode {
  --bg-page: #0f1722;
  --bg-card: #152232;
  --bg-header: rgba(17, 28, 43, 0.85);
  --bg-footer: #0b1119;
  --text-primary: #d3deec;
  --text-secondary: #b4c1d4;
  --text-heading: #f2f7ff;
  --text-link: #7ab0d9;
  --border-light: #2e405b;
  --brand-main: #6b9fd1;
  --brand-dark: #a2c4e4;
  --brand-accent: #f39c12;
  --btn-bg: #2c5f8a;
  --btn-text: #ffffff;
  --nav-bg: rgba(15, 25, 40, 0.9);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  --footer-text: #cbd5e1;
  --footer-heading: #ffffff;
  --gradient-hero: linear-gradient(145deg, #1c2f46, #0e1f30, #091520);
  --gradient-section: linear-gradient(135deg, #111c2b, #0f1722);
  --card-hover-shadow: 0 12px 28px rgba(0, 0, 0, 0.5);
}

/* ---------- 基础 ---------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-page);
  background-image: var(--gradient-section);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
  padding-top: 70px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  color: var(--text-heading);
  font-weight: 650;
  line-height: 1.3;
}

p, li, span, div, a, time, blockquote {
  color: inherit;
}

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

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

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

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

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--brand-main);
  border-radius: 8px;
}

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

::selection {
  background: var(--brand-main);
  color: #fff;
}

/* ---------- 导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

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

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

.brand {
  flex-shrink: 0;
}

.brand a {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.2s ease;
}

.brand a:hover {
  transform: scale(1.03);
  text-decoration: none;
}

.brand a::before {
  content: "🎬";
  font-size: 1.8rem;
}

.menu-links {
  display: flex;
  gap: 24px;
  font-weight: 500;
  flex-wrap: wrap;
}

.menu-links a {
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 6px 2px;
  position: relative;
  transition: color 0.2s ease;
}

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

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

#searchInput {
  padding: 8px 16px;
  border-radius: 30px;
  border: 1px solid var(--border-light);
  background: var(--bg-card);
  color: var(--text-primary);
  width: 200px;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

#searchInput::placeholder {
  color: var(--text-secondary);
  opacity: 0.8;
}

#searchInput:focus {
  outline: none;
  border-color: var(--brand-main);
  box-shadow: 0 0 0 3px rgba(59, 110, 165, 0.15);
  width: 240px;
}

.icon-btn {
  background: none;
  border: 2px solid transparent;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--text-heading);
  line-height: 1;
  padding: 6px;
  border-radius: 50%;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.icon-btn:hover {
  background: var(--border-light);
  transform: rotate(15deg) scale(1.1);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-heading);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.2s ease;
}

.mobile-menu-toggle:hover {
  background: var(--border-light);
}

/* 移动端导航 */
@media (max-width: 900px) {
  .menu-links {
    display: none;
    flex-direction: column;
    background: var(--bg-card);
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    padding: 16px 24px;
    gap: 12px;
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--border-light);
  }

  .menu-links.mobile-open {
    display: flex;
    animation: slideDown 0.3s ease;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .nav-actions #searchInput {
    width: 120px;
  }

  .nav-actions #searchInput:focus {
    width: 150px;
  }

  .brand a {
    font-size: 1.3rem;
  }
}

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

  .nav-wrap {
    height: 58px;
    gap: 8px;
  }

  .brand a {
    font-size: 1.1rem;
  }

  .brand a::before {
    font-size: 1.3rem;
  }

  .nav-actions {
    gap: 4px;
  }

  #searchInput {
    width: 90px;
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  #searchInput:focus {
    width: 110px;
  }

  .icon-btn {
    font-size: 1.2rem;
    width: 34px;
    height: 34px;
  }
}

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

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

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 10px rgba(59, 110, 165, 0.2);
  }
  50% {
    box-shadow: 0 0 20px rgba(59, 110, 165, 0.4);
  }
}

/* ---------- 按钮 ---------- */
.btn {
  background-color: var(--btn-bg);
  color: var(--btn-text);
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-block;
  font-size: 0.95rem;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  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 {
  filter: brightness(1.1);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  text-decoration: none;
}

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

.btn:active {
  transform: translateY(-1px);
}

.btn-light {
  background: white;
  color: #1f3f5c;
}

.btn-light:hover {
  background: #f0f7ff;
}

/* ---------- Hero ---------- */
.hero {
  padding: 40px 0 20px;
}

.hero-card {
  background: var(--gradient-hero);
  border-radius: 28px;
  padding: 48px 40px;
  color: white;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  animation: pulseGlow 4s infinite alternate;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero-card::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  font-size: 2.5rem;
  color: white;
  margin-bottom: 16px;
  font-weight: 700;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  position: relative;
  z-index: 1;
}

.hero p {
  font-size: 1.1rem;
  color: #f0f7ff;
  max-width: 600px;
  position: relative;
  z-index: 1;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .hero-card {
    padding: 32px 24px;
    flex-direction: column;
    align-items: flex-start;
  }

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

  .hero p {
    font-size: 1rem;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
  }
}

/* ---------- 卡片通用 ---------- */
.section-title {
  font-size: 2rem;
  margin: 50px 0 24px;
  border-left: 6px solid var(--brand-main);
  padding-left: 18px;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 18px;
  width: 40px;
  height: 2px;
  background: var(--brand-accent);
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  animation: fadeInUp 0.6s ease both;
}

.card:hover {
  transform: var(--card-hover-transform);
  box-shadow: var(--card-hover-shadow);
  border-color: var(--brand-main);
}

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  color: var(--text-heading);
}

.card h4 {
  font-size: 1.1rem;
  margin: 12px 0 6px;
  color: var(--text-heading);
}

.card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 卡片动画延迟 */
.grid-cards .card:nth-child(1) { animation-delay: 0.1s; }
.grid-cards .card:nth-child(2) { animation-delay: 0.2s; }
.grid-cards .card:nth-child(3) { animation-delay: 0.3s; }
.grid-cards .card:nth-child(4) { animation-delay: 0.4s; }

.meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* FAQ 样式 */
.faq-item {
  background: var(--bg-card);
  border-radius: 14px;
  padding: 0 20px;
  margin-bottom: 12px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  overflow: hidden;
}

.faq-item:hover {
  border-color: var(--brand-main);
  box-shadow: var(--card-hover-shadow);
}

.faq-q {
  padding: 18px 0;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-heading);
  font-size: 1.05rem;
  transition: color 0.2s ease;
  user-select: none;
}

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

.faq-q span {
  font-size: 0.8rem;
  transition: transform 0.3s ease;
  color: var(--brand-main);
  flex-shrink: 0;
}

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

.faq-a {
  padding-bottom: 18px;
  color: var(--text-primary);
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
  line-height: 1.8;
  animation: fadeInUp 0.3s ease;
}

.hidden-answer {
  display: none;
}

/* 文章卡片 */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.article-row {
  background: var(--bg-card);
  padding: 20px 24px;
  border-radius: 16px;
  border-left: 5px solid var(--brand-main);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  animation: fadeInUp 0.6s ease both;
}

.article-row:nth-child(2) { animation-delay: 0.1s; }
.article-row:nth-child(3) { animation-delay: 0.2s; }
.article-row:nth-child(4) { animation-delay: 0.3s; }
.article-row:nth-child(5) { animation-delay: 0.4s; }
.article-row:nth-child(6) { animation-delay: 0.5s; }
.article-row:nth-child(7) { animation-delay: 0.6s; }
.article-row:nth-child(8) { animation-delay: 0.7s; }
.article-row:nth-child(9) { animation-delay: 0.8s; }
.article-row:nth-child(10) { animation-delay: 0.9s; }

.article-row:hover {
  transform: translateX(8px);
  box-shadow: var(--card-hover-shadow);
  border-left-color: var(--brand-accent);
}

.article-row h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  transition: color 0.2s ease;
}

.article-row:hover h3 {
  color: var(--brand-main);
}

.article-row .readmore {
  font-weight: 600;
  display: inline-block;
  margin-top: 10px;
  color: var(--brand-main);
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.article-row .readmore:hover {
  color: var(--brand-accent);
  transform: translateX(4px);
  text-decoration: none;
}

/* ---------- 列表样式 ---------- */
ol, ul {
  padding-left: 1.4rem;
  color: var(--text-primary);
}

ol li, ul li {
  margin-bottom: 8px;
  line-height: 1.8;
}

/* ---------- 联系卡片 ---------- */
.grid-cards .card h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
}

.grid-cards .card p {
  font-size: 0.95rem;
}

/* 企业信息卡片 */
#contact .card {
  padding: 24px;
}

#contact .card p {
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

#contact .card p:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-footer);
  color: var(--footer-text);
  padding: 50px 0 20px;
  margin-top: 60px;
  position: relative;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  margin-bottom: 30px;
}

.footer h4 {
  color: var(--footer-heading);
  margin-bottom: 16px;
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 8px;
}

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

.footer a {
  color: var(--footer-text);
  opacity: 0.9;
  transition: all 0.2s ease;
}

.footer a:hover {
  color: white;
  opacity: 1;
  text-decoration: none;
  padding-left: 4px;
}

.footer p {
  line-height: 1.8;
  font-size: 0.9rem;
}

.copyright {
  border-top: 1px solid #3a4a5a;
  margin-top: 30px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  line-height: 1.8;
}

.copyright p {
  margin-bottom: 6px;
}

/* ---------- 返回顶部 ---------- */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.8rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 200;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

#backToTop:hover {
  background: var(--brand-dark);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

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

@media (max-width: 480px) {
  #backToTop {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.5rem;
  }
}

/* ---------- 响应式调整 ---------- */
@media (max-width: 768px) {
  .section-title {
    font-size: 1.6rem;
    margin: 40px 0 20px;
  }

  .grid-cards {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
  }

  .card {
    padding: 16px;
  }

  .hero-card {
    padding: 32px 24px;
  }

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

  .article-row {
    padding: 16px 18px;
  }

  .article-row h3 {
    font-size: 1.1rem;
  }

  .footer-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 24px;
  }
}

@media (max-width: 480px) {
  .grid-cards {
    grid-template-columns: 1fr;
  }

  .hero-card {
    padding: 24px 16px;
    border-radius: 20px;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero p {
    font-size: 0.95rem;
  }

  .section-title {
    font-size: 1.4rem;
  }

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

/* ---------- 暗色模式微调 ---------- */
.dark-mode .hero-card {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.dark-mode .brand a,
.dark-mode .menu-links a {
  color: #f0f6ff;
}

.dark-mode .icon-btn {
  color: #f0f6ff;
}

.dark-mode #searchInput {
  background: #0e1a29;
  border-color: #2c3f58;
}

.dark-mode .faq-a {
  border-top-color: #2e405b;
}

.dark-mode .article-row {
  border-left-color: var(--brand-main);
}

.dark-mode .article-row:hover {
  border-left-color: var(--brand-accent);
}

.dark-mode .copyright {
  border-top-color: #2a3a4a;
}

/* ---------- 打印样式 ---------- */
@media print {
  body {
    padding-top: 0;
    background: white;
  }

  .site-header,
  .hero-cta,
  #backToTop,
  .footer {
    display: none;
  }

  .container {
    max-width: 100%;
  }
}

/* ---------- 无障碍 ---------- */
:focus-visible {
  outline: 3px solid var(--brand-main);
  outline-offset: 2px;
}

@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;
  }
}
```