:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --primary-light: #ecf2fe;
      --accent: #00a8ff;
      --text-main: #1d2129;
      --text-regular: #4e5969;
      --text-muted: #86909c;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-subtle: #f2f4f8;
      --border-color: #e5e6eb;
      --border-focus: #165dff;
      --shadow-sm: 0 2px 8px rgba(0, 82, 217, 0.04);
      --shadow-md: 0 6px 18px rgba(0, 82, 217, 0.08);
      --shadow-lg: 0 12px 32px rgba(0, 82, 217, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-max: 1200px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

    * {
      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, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition-smooth);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition-smooth);
      border: 1px solid transparent;
      line-height: 1.4;
      text-align: center;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 16px rgba(0, 82, 217, 0.35);
      transform: translateY(-1px);
    }

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

    .btn-secondary:hover {
      background-color: var(--primary-light);
      transform: translateY(-1px);
    }

    .btn-accent {
      background: linear-gradient(135deg, #0052d9, #00a8ff);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 168, 255, 0.3);
    }

    .btn-accent:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 20px;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-regular);
      max-width: 680px;
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(229, 230, 235, 0.8);
      transition: var(--transition-smooth);
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-regular);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

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

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

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

    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: var(--transition-smooth);
    }

    .hero-section {
      background: radial-gradient(circle at 80% 20%, #e0edff 0%, #f4f8fe 50%, #f8fafc 100%);
      padding: 72px 0 64px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      max-width: 880px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid #c9ddff;
      border-radius: 30px;
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0b1a30;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      line-height: 1.7;
      color: var(--text-regular);
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 44px;
      flex-wrap: wrap;
    }

    .hero-stats-panel {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

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

    .stat-num {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

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

    .page-section {
      padding: 72px 0;
    }

    .section-alt {
      background-color: var(--bg-subtle);
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
      align-items: start;
    }

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

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card:hover {
      box-shadow: var(--shadow-md);
      border-color: #b2d5fe;
      transform: translateY(-3px);
    }

    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      margin-bottom: 20px;
      font-size: 1.25rem;
      font-weight: bold;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-regular);
      line-height: 1.6;
      flex-grow: 1;
    }

    .intro-points {
      list-style: none;
      margin-top: 20px;
    }

    .intro-points li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 14px;
      font-size: 0.95rem;
      color: var(--text-regular);
    }

    .intro-points li::before {
      content: "";
      position: absolute;
      left: 4px;
      top: 9px;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--primary);
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 18px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      transition: var(--transition-smooth);
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
    }

    .service-badge {
      font-size: 0.75rem;
      font-weight: 700;
      color: #0052d9;
      background: #dbeafe;
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
      align-self: flex-start;
    }

    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .flow-step-card {
      background: #ffffff;
      padding: 26px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .flow-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
      margin-bottom: 16px;
    }

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

    .network-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
    }

    .network-city {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .media-thumb-box {
      width: 100%;
      background-color: #edf2f7;
      aspect-ratio: 16 / 9;
      overflow: hidden;
    }

    .media-thumb-box.square {
      aspect-ratio: 1 / 1;
    }

    .media-thumb-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-thumb-box img {
      transform: scale(1.03);
    }

    .media-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .rating-banner {
      background: linear-gradient(135deg, #0f274a, #0052d9);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      box-shadow: var(--shadow-lg);
    }

    .rating-banner-left {
      max-width: 600px;
    }

    .rating-stars {
      color: #ffb800;
      font-size: 1.35rem;
      letter-spacing: 2px;
      margin-bottom: 8px;
    }

    .rating-score-box {
      text-align: right;
      min-width: 160px;
    }

    .rating-score-val {
      font-size: 3.4rem;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .rating-score-max {
      font-size: 1.1rem;
      opacity: 0.85;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background-color: #f7f9fc;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .compare-table tr:hover td {
      background-color: #f8fbff;
    }

    .cell-highlight {
      color: var(--primary);
      font-weight: 700;
    }

    .form-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-full {
      grid-column: 1 / -1;
    }

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #fcfdfe;
      outline: none;
      transition: var(--transition-smooth);
    }

    .form-control:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.15);
      background-color: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pricing-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      transition: var(--transition-smooth);
      position: relative;
    }

    .pricing-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-lg);
    }

    .pricing-tag {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #ffffff;
      font-size: 0.78rem;
      font-weight: 700;
      padding: 3px 14px;
      border-radius: 12px;
    }

    .pricing-val {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin: 16px 0 8px 0;
    }

    .pricing-features {
      list-style: none;
      text-align: left;
      margin: 24px 0;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }

    .pricing-features li {
      font-size: 0.9rem;
      color: var(--text-regular);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition-smooth);
    }

    .faq-item.active {
      border-color: #b2d5fe;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
      user-select: none;
    }

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

    .faq-arrow {
      font-size: 1.1rem;
      transition: transform 0.3s ease;
      color: var(--primary);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 22px;
      color: var(--text-regular);
      font-size: 0.92rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding-bottom: 20px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }

    .author-avatar-text {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
    }

    .author-info h4 {
      font-size: 0.92rem;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .articles-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition-smooth);
    }

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .article-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .article-date {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .agent-card-wrap {
      background: linear-gradient(135deg, #f0f7ff 0%, #ffffff 100%);
      border: 1px solid #cce3fe;
      border-radius: var(--radius-lg);
      padding: 40px;
    }

    .site-footer {
      background-color: #0b1a30;
      color: #cbd5e1;
      padding: 60px 0 30px 0;
      font-size: 0.9rem;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 48px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p {
      line-height: 1.8;
      color: #94a3b8;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

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

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

    .qr-box {
      width: 100px;
      height: 100px;
      background: #ffffff;
      padding: 4px;
      border-radius: 6px;
      margin-top: 10px;
    }

    .qr-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .friend-links-box {
      padding: 24px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-list a {
      color: #94a3b8;
      font-size: 0.85rem;
    }

    .friend-links-list a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      text-align: center;
      color: #64748b;
      font-size: 0.82rem;
    }

    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 16px rgba(0, 82, 217, 0.35);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: none;
      transition: var(--transition-smooth);
      position: relative;
    }

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

    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      display: none;
      width: 140px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      height: auto;
      margin-bottom: 6px;
    }

    .float-qr-pop span {
      font-size: 0.75rem;
      color: var(--text-main);
      display: block;
      font-weight: bold;
    }

    .float-btn:hover .float-qr-pop {
      display: block;
    }

    @media (max-width: 1024px) {
      .hero-stats-panel {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .grid-4, .pricing-grid, .network-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background-color: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 20px;
        display: none;
        flex-direction: column;
        align-items: flex-start;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 12px;
      }
      .grid-2, .grid-3, .grid-4, .pricing-grid, .network-grid, .flow-steps {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .hero-stats-panel {
        grid-template-columns: 1fr;
      }
      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 12px;
      }
      .stat-item:last-child {
        border-bottom: none;
        padding-bottom: 0;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
      .rating-score-box {
        text-align: center;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }