:root {
  --primary: #2a5c8a;
  --primary-dark: #1e3f5e;
  --primary-light: #e3edf9;
  --accent: #ffb347;
  --bg: #f8f9fc;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --text: #1a1a2e;
  --text-secondary: #2d3f54;
  --text-muted: #5f738a;
  --border: #eaedf2;
  --shadow: rgba(0, 20, 40, 0.08);
  --shadow-sm: rgba(0, 0, 0, 0.03);
  --radius: 24px;
  --radius-sm: 18px;
  --radius-lg: 32px;
}

body.dark-mode {
  --primary: #8ab4f8;
  --primary-dark: #a0c4e8;
  --primary-light: #1e2a3a;
  --bg: #0f0f1a;
  --bg-card: #141b24;
  --bg-glass: rgba(15, 15, 26, 0.92);
  --text: #eaeef2;
  --text-secondary: #b8c9dd;
  --text-muted: #9aaec2;
  --border: #26303c;
  --shadow: rgba(0, 0, 0, 0.4);
  --shadow-sm: rgba(0, 0, 0, 0.2);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

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

a:hover {
  text-decoration: underline;
}

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

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

/* 吸顶导航 - 毛玻璃效果 */
.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: background 0.3s, border-color 0.3s;
}

body.dark-mode .sticky-nav {
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.5px;
  color: var(--text);
  transition: transform 0.3s;
}

.logo:hover {
  transform: scale(1.03);
}

.logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  align-items: center;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-secondary);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-box {
  display: flex;
  align-items: center;
  background: #f0f2f5;
  border-radius: 40px;
  padding: 4px 6px 4px 16px;
  border: 1px solid transparent;
  transition: border 0.2s, background 0.3s, box-shadow 0.2s;
}

body.dark-mode .search-box {
  background: #1e1e2f;
  border-color: #2d3748;
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(42, 92, 138, 0.12);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 8px 0;
  font-size: 0.9rem;
  outline: none;
  width: 150px;
  color: inherit;
}

.search-box input::placeholder {
  color: #8b9eb0;
}

.search-box button {
  border: none;
  background: var(--primary);
  color: white;
  border-radius: 40px;
  padding: 6px 14px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.search-box button:hover {
  background: var(--primary-dark);
  transform: scale(1.04);
}

.theme-toggle {
  background: none;
  border: 1px solid #d0d7de;
  border-radius: 40px;
  padding: 6px 12px;
  font-size: 0.9rem;
  cursor: pointer;
  color: inherit;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}

body.dark-mode .theme-toggle {
  border-color: #3a4a5a;
}

.theme-toggle:hover {
  background: rgba(0, 0, 0, 0.04);
  transform: rotate(15deg);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid #d0d7de;
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 1.4rem;
  cursor: pointer;
  color: inherit;
  transition: background 0.2s;
}

.mobile-menu-btn:hover {
  background: rgba(0, 0, 0, 0.04);
}

/* 面包屑 */
.breadcrumb {
  padding: 14px 0 6px;
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

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

/* 首屏区域 */
.hero {
  padding: 28px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
}

.hero h1 {
  font-size: 2.4rem;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 18px;
  color: var(--text);
}

.hero .highlight {
  color: var(--primary);
  background: linear-gradient(145deg, var(--primary-light), #ffffff);
  padding: 2px 8px;
  border-radius: 8px;
  display: inline-block;
  transition: transform 0.3s;
}

body.dark-mode .hero .highlight {
  background: var(--primary-light);
}

.hero .highlight:hover {
  transform: scale(1.02);
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  max-width: 600px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.2;
  transition: transform 0.3s;
}

.stat-item:hover .stat-number {
  transform: scale(1.08);
}

body.dark-mode .stat-number {
  color: var(--primary-dark);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Banner轮播 - 渐变+毛玻璃 */
.carousel {
  background: linear-gradient(135deg, #e9f0fa, #ffffff 60%, #f0e6ff);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: 0 12px 30px var(--shadow);
  border: 1px solid rgba(42, 92, 138, 0.12);
  position: relative;
  overflow: hidden;
  min-height: 220px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.carousel::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(42, 92, 138, 0.08), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

body.dark-mode .carousel {
  background: linear-gradient(135deg, #161c26, #1a2230 60%, #1e1a2e);
  border-color: #2a3a4a;
}

.carousel:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px var(--shadow);
}

.carousel-slide {
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: slideFadeIn 0.5s ease;
}

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

.carousel-slide h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #0f2a44;
}

body.dark-mode .carousel-slide h3 {
  color: #d6e6f9;
}

.carousel-slide p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.carousel-indicators {
  display: flex;
  gap: 8px;
  margin-top: 18px;
}

.carousel-indicators span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #cbd5e1;
  cursor: pointer;
  transition: background 0.2s, width 0.3s, border-radius 0.3s;
}

.carousel-indicators span.active {
  background: var(--primary);
  width: 28px;
  border-radius: 10px;
}

.carousel-indicators span:hover {
  background: var(--primary);
  opacity: 0.7;
}

/* 通用卡片 */
.section {
  padding: 54px 0;
}

.section-title {
  font-size: 1.9rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
  letter-spacing: -0.3px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
}

.section-sub {
  color: #526b84;
  margin-bottom: 36px;
  font-size: 1.05rem;
  max-width: 780px;
}

body.dark-mode .section-sub {
  color: var(--text-muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 26px 22px;
  box-shadow: 0 6px 18px var(--shadow-sm);
  border: 1px solid var(--border);
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 30px var(--shadow);
  border-color: rgba(42, 92, 138, 0.2);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

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

/* 文章列表 */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.article-item {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 22px;
  border: 1px solid var(--border);
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
  position: relative;
}

.article-item:hover {
  box-shadow: 0 12px 28px var(--shadow);
  transform: translateY(-3px);
  border-color: rgba(42, 92, 138, 0.18);
}

.article-item .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.article-item h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
  transition: color 0.2s;
}

.article-item:hover h3 {
  color: var(--primary);
}

.article-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.read-more {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s, color 0.2s;
}

.read-more:hover {
  gap: 8px;
  text-decoration: none;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 18px 24px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.faq-item:hover {
  box-shadow: 0 6px 18px var(--shadow-sm);
  border-color: rgba(42, 92, 138, 0.15);
}

.faq-question {
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
}

.faq-question span {
  transition: transform 0.3s;
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.faq-answer {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: none;
  animation: faqFadeIn 0.3s ease;
}

@keyframes faqFadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.faq-item.open .faq-answer {
  display: block;
}

/* HowTo */
.howto-steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
  counter-reset: step;
}

.howto-step {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 22px 26px;
  border-left: 6px solid var(--primary);
  box-shadow: 0 4px 12px var(--shadow-sm);
  transition: transform 0.25s, box-shadow 0.25s;
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 24px var(--shadow);
}

.howto-step h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}

.howto-step h4::before {
  counter-increment: step;
  content: counter(step);
  background: var(--primary);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  flex-shrink: 0;
}

.howto-step p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* 团队/EEAT */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.team-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 22px;
  text-align: center;
  border: 1px solid var(--border);
  transition: transform 0.25s, box-shadow 0.25s;
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px var(--shadow);
}

.team-card svg {
  margin: 0 auto 12px;
  transition: transform 0.3s;
}

.team-card:hover svg {
  transform: scale(1.1);
}

.team-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text);
}

.team-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 企业信息块 */
.section > div[style*="background:#f0f4fa"] {
  transition: transform 0.25s;
}

.section > div[style*="background:#f0f4fa"]:hover {
  transform: translateY(-2px);
}

/* 页脚 */
.footer {
  background: #0f1a26;
  color: #cddae9;
  padding: 48px 0 24px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

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

body.dark-mode .footer {
  background: #080c12;
}

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

.footer h4 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: 16px;
  font-weight: 700;
}

.footer a {
  color: #b0c4d9;
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  transition: color 0.2s, transform 0.2s;
}

.footer a:hover {
  color: #ffffff;
  text-decoration: none;
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid #2a3a4a;
  margin-top: 36px;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: #8b9eb0;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--primary);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(42, 92, 138, 0.4);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s, background 0.2s;
  border: none;
  font-size: 1.4rem;
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  background: var(--primary-dark);
}

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

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 5px;
  border: 2px solid var(--bg);
}

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

/* 选中文字 */
::selection {
  background: rgba(42, 92, 138, 0.25);
  color: inherit;
}

/* 焦点可见性 */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 移动端 */
@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 0;
    gap: 8px;
  }

  .nav-links.show {
    display: flex;
    animation: navSlideDown 0.3s ease;
  }

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

  .nav-links a {
    width: 100%;
    padding: 8px 4px;
    border-bottom: 1px solid var(--border);
  }

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

  .nav-inner {
    justify-content: space-between;
  }

  .search-box input {
    width: 100px;
  }

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

  .section {
    padding: 40px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }
}

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

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

  .stat-number {
    font-size: 1.5rem;
  }

  .hero-stats {
    gap: 20px;
  }

  .search-box input {
    width: 80px;
  }

  .search-box button {
    padding: 6px 10px;
    font-size: 0.8rem;
  }

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

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

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .section-title::after {
    width: 32px;
  }
}

/* 减少动画偏好 */
@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;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* 打印样式 */
@media print {
  .sticky-nav,
  .back-to-top,
  .carousel,
  .footer {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

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