:root {
      --primary: #2563eb;
      --primary-dark: #1d4ed8;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --secondary: #06b6d4;
      --dark-text: #0f172a;
      --body-text: #334155;
      --muted-text: #64748b;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --card-border: #e2e8f0;
      --card-hover-border: #cbd5e1;
      --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
      --radius: 12px;
      --container-width: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    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-light);
      color: var(--body-text);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--card-border);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-area img {
      max-height: 44px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-text);
    }
    .nav-links {
      display: flex;
      gap: 0;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--body-text);
      padding: 8px 12px;
      border-radius: 6px;
    }
    .nav-links a:hover {
      color: var(--primary);
      background-color: rgba(37, 99, 235, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn:active {
      transform: scale(0.98);
    }
    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
      transform: translateY(-1px);
    }
    .btn-accent {
      background: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 16px rgba(249, 115, 22, 0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      border-color: var(--card-border);
      background: #ffffff;
      color: var(--dark-text);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .section-spacing {
      padding: 72px 0;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--accent);
      background: rgba(249, 115, 22, 0.1);
      padding: 4px 12px;
      border-radius: 999px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--dark-text);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--muted-text);
      line-height: 1.6;
    }
    .hero-section {
      padding: 80px 0 60px 0;
      background: linear-gradient(135deg, #eef2ff 0%, #ffffff 50%, #fff7ed 100%);
      border-bottom: 1px solid var(--card-border);
      position: relative;
    }
    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid #fed7aa;
      padding: 6px 16px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #ea580c;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--dark-text);
      line-height: 1.25;
      margin-bottom: 20px;
      max-width: 960px;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--body-text);
      max-width: 820px;
      margin-bottom: 36px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
      max-width: 1000px;
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-md);
    }
    .stat-item {
      text-align: center;
      border-right: 1px solid var(--card-border);
    }
    .stat-item:last-child {
      border-right: none;
    }
    .stat-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--dark-text);
      margin-bottom: 4px;
    }
    .stat-value em {
      font-style: normal;
      color: var(--accent);
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--muted-text);
      font-weight: 500;
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }
    .feature-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }
    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }
    .feature-card.hot .card-icon {
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent);
    }
    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 0.9rem;
      color: var(--muted-text);
      line-height: 1.6;
      flex-grow: 1;
    }
    .model-tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-chip {
      background: #ffffff;
      border: 1px solid var(--card-border);
      padding: 6px 14px;
      border-radius: 8px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--dark-text);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }
    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .media-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--card-border);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-thumb {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
    }
    .media-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }
    .media-thumb:hover img {
      transform: scale(1.03);
    }
    .media-content {
      padding: 20px;
    }
    .media-content h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 8px;
    }
    .media-content p {
      font-size: 0.88rem;
      color: var(--muted-text);
      line-height: 1.5;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--card-border);
      font-size: 0.95rem;
    }
    .comparison-table th {
      background: #f8fafc;
      color: var(--dark-text);
      font-weight: 700;
    }
    .comparison-table tr:hover td {
      background: #fdfdfd;
    }
    .highlight-col {
      background: rgba(37, 99, 235, 0.03);
      font-weight: 600;
      color: var(--primary);
    }
    .rating-badge {
      display: inline-flex;
      align-items: center;
      background: #ffedd5;
      color: #ea580c;
      padding: 6px 14px;
      border-radius: 999px;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 16px;
    }
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-box {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--card-border);
      padding: 24px 20px;
      position: relative;
    }
    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--accent);
      color: #ffffff;
      font-size: 0.9rem;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
    }
    .step-box h4 {
      font-size: 1.05rem;
      color: var(--dark-text);
      margin-bottom: 8px;
    }
    .step-box p {
      font-size: 0.88rem;
      color: var(--muted-text);
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-body {
      font-size: 0.92rem;
      color: var(--body-text);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .user-meta h5 {
      font-size: 0.95rem;
      color: var(--dark-text);
    }
    .user-meta span {
      font-size: 0.8rem;
      color: var(--muted-text);
    }
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: 10px;
      overflow: hidden;
      transition: all 0.2s;
    }
    .faq-trigger {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark-text);
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-trigger:hover {
      color: var(--primary);
    }
    .faq-content {
      padding: 0 24px 20px 24px;
      font-size: 0.92rem;
      color: var(--muted-text);
      line-height: 1.6;
      display: none;
    }
    .faq-item.active .faq-content {
      display: block;
    }
    .faq-icon {
      font-size: 1.2rem;
      line-height: 1;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      padding: 40px;
      border-radius: var(--radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark-text);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--card-border);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s;
      background: #fafafa;
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .contact-info-block {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .contact-card-item {
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }
    .contact-card-item .icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: rgba(37,99,235,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      flex-shrink: 0;
    }
    .qr-container {
      display: flex;
      gap: 20px;
      margin-top: 10px;
      align-items: center;
      background: #f8fafc;
      padding: 16px;
      border-radius: 10px;
      border: 1px solid var(--card-border);
    }
    .qr-container img {
      width: 100px;
      height: 100px;
      border-radius: 6px;
      display: block;
    }
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px 0;
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.2rem;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 0.88rem;
      line-height: 1.6;
      color: #94a3b8;
    }
    .footer-links h5 {
      color: #ffffff;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }
    .footer-links ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
      align-items: center;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }
    .friend-links-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      justify-content: center;
      margin-bottom: 8px;
    }
    .friend-links-bar a {
      color: #94a3b8;
    }
    .friend-links-bar a:hover {
      color: #ffffff;
    }
    .articles-links-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
    }
    .articles-links-bar a {
      color: #94a3b8;
    }
    .articles-links-bar a:hover {
      color: #38bdf8;
    }
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: 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;
    }
    .floating-btn:hover {
      transform: scale(1.08);
      background: var(--accent);
    }
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .banner-item {
      border-radius: 10px;
      overflow: hidden;
      border: 1px solid var(--card-border);
    }
    .banner-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .media-card-grid, .testimonials-grid, .steps-grid, .banner-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .form-layout {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--card-border);
        padding: 16px;
      }
      .nav-links.show {
        display: flex;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-stats {
        grid-template-columns: 1fr;
      }
      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--card-border);
        padding-bottom: 12px;
      }
      .stat-item:last-child {
        border-bottom: none;
      }
      .media-card-grid, .testimonials-grid, .steps-grid, .banner-gallery {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }