:root {
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --primary-light: #e0f2fe;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --container-max: 1200px;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease, opacity 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-logo-wrap {
      max-width: 130px;
      height: auto;
      display: flex;
      align-items: center;
    }

    .brand-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.02em;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

    .header-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.2s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 10px rgba(2, 132, 199, 0.25);
    }

    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
      border-color: var(--accent);
    }

    .btn-accent:hover {
      background-color: var(--accent-hover);
      box-shadow: 0 4px 10px rgba(249, 115, 22, 0.25);
    }

    .btn-outline {
      background-color: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background-color: var(--primary-light);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle svg {
      width: 24px;
      height: 24px;
      stroke: var(--text-main);
    }

    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(180deg, #f0f9ff 0%, var(--bg-page) 100%);
      border-bottom: 1px solid var(--border-color);
      text-align: center;
    }

    .hero-tagline {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background-color: var(--primary-light);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 9999px;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 2.35rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -0.02em;
    }

    .hero-desc {
      max-width: 820px;
      margin: 0 auto 28px;
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 45px;
      flex-wrap: wrap;
    }

    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .metric-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .metric-item:last-child {
      border-right: none;
    }

    .metric-num {
      font-size: 1.7rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .section {
      padding: 60px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 40px;
    }

    .section-eyebrow {
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 0.05em;
      margin-bottom: 8px;
    }

    .section-heading {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-intro {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.55;
      flex-grow: 1;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 15px;
    }

    .tag-item {
      display: inline-block;
      padding: 4px 10px;
      font-size: 0.78rem;
      background-color: var(--bg-alt);
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .about-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: center;
    }

    .about-body p {
      margin-bottom: 14px;
      font-size: 0.94rem;
      color: var(--text-muted);
    }

    .model-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 15px;
    }

    .model-chip {
      font-size: 0.76rem;
      font-weight: 600;
      padding: 4px 10px;
      background-color: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 4px;
      color: var(--text-main);
    }

    .steps-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-box {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      position: relative;
    }

    .step-index {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background-color: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 14px;
    }

    .step-box h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    .table-wrapper {
      overflow-x: auto;
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.9rem;
    }

    th, td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
    }

    th {
      background-color: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
      white-space: nowrap;
    }

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

    .badge-highlight {
      display: inline-block;
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
      background-color: #dbeafe;
      color: #1e40af;
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .author-meta h4 {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-meta span {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .faq-item {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .faq-header {
      width: 100%;
      padding: 16px 20px;
      text-align: left;
      background: none;
      border: none;
      outline: none;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-header:hover {
      background-color: var(--bg-alt);
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      color: var(--text-muted);
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease-out;
      background-color: #fafbfc;
    }

    .faq-content p {
      padding: 0 20px 16px;
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-label {
      display: block;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      font-size: 0.9rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      font-family: inherit;
      background-color: #ffffff;
      color: var(--text-main);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 24px;
    }

    .contact-item {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .contact-item strong {
      color: var(--text-main);
    }

    .qr-box {
      display: inline-block;
      padding: 10px;
      background-color: var(--bg-alt);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      max-width: 140px;
    }

    .media-card-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 24px;
    }

    .media-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .media-thumb {
      aspect-ratio: 16 / 9;
      background-color: var(--bg-alt);
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-thumb.square {
      aspect-ratio: 1 / 1;
      max-width: 260px;
      margin: 0 auto;
    }

    .media-body {
      padding: 16px;
    }

    .media-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

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

    .banner-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin-top: 24px;
    }

    .banner-strip-item {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
      aspect-ratio: 16 / 9;
      background-color: var(--bg-alt);
    }

    .article-links-wrap {
      display: flex;
      flex-direction: column;
      gap: 12px;
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.9rem;
      padding: 10px 14px;
      background-color: var(--bg-alt);
      border-radius: var(--radius-sm);
      color: var(--text-main);
    }

    .article-link-item:hover {
      background-color: var(--primary-light);
      color: var(--primary);
    }

    .article-tag {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #f8fafc;
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-col p {
      font-size: 0.85rem;
      line-height: 1.6;
      margin-bottom: 12px;
    }

    .footer-nav {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-nav a {
      font-size: 0.85rem;
      color: #94a3b8;
    }

    .footer-nav a:hover {
      color: #ffffff;
    }

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-box h5 {
      color: #cbd5e1;
      font-size: 0.85rem;
      margin-bottom: 12px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.82rem;
    }

    .friend-links-list a {
      color: #94a3b8;
    }

    .friend-links-list a:hover {
      color: var(--primary-light);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.8rem;
    }

    .fixed-floating-box {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background-color: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      border: none;
      transition: transform 0.2s ease, background-color 0.2s ease;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background-color: var(--primary-hover);
    }

    .float-qr-panel {
      position: absolute;
      right: 56px;
      bottom: 0;
      background-color: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      text-align: center;
      width: 140px;
    }

    .float-qr-panel span {
      font-size: 0.75rem;
      color: var(--text-main);
      display: block;
      margin-top: 6px;
    }

    .float-contact:hover .float-qr-panel {
      display: block;
    }

    @media (max-width: 992px) {
      .grid-3, .grid-4, .metrics-bar, .steps-container, .reviews-grid, .banner-strip {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-layout, .contact-grid, .media-card-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 1.95rem;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .grid-3, .grid-4, .metrics-bar, .steps-container, .reviews-grid, .banner-strip, .footer-grid {
        grid-template-columns: 1fr;
      }
      .metric-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 12px;
      }
      .metric-item:last-child {
        border-bottom: none;
        padding-bottom: 0;
      }
      .hero-title {
        font-size: 1.6rem;
      }
      .section-heading {
        font-size: 1.45rem;
      }
      .contact-grid {
        padding: 20px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
      }
    }