:root {
      --primary-color: #2563eb;
      --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #db2777 100%);
      --accent-coral: #ff5722;
      --accent-yellow: #ffb703;
      --accent-cyan: #06b6d4;
      --accent-emerald: #10b981;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-subtle: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 8px 24px rgba(37, 99, 235, 0.1);
      --shadow-lg: 0 16px 36px rgba(124, 58, 237, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

    * {
      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", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid #e0e7ff;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    }

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

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 20px;
      color: var(--text-main);
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

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

    .nav-links li a {
      padding: 10px 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      display: inline-block;
      white-space: nowrap;
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background: #eff6ff;
    }

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

    .btn-header {
      padding: 10px 20px;
      border-radius: 50px;
      font-size: 14px;
      font-weight: 700;
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }

    .btn-header:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(37, 99, 235, 0.4);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      font-size: 18px;
      cursor: pointer;
    }

    .hero-section {
      position: relative;
      padding: 80px 0 60px;
      background: radial-gradient(circle at top center, #e0f2fe 0%, #fae8ff 50%, #f8fafc 100%);
      overflow: hidden;
      border-bottom: 1px solid #e2e8f0;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 18px;
      border-radius: 50px;
      font-size: 13px;
      font-weight: 700;
      color: #ea580c;
      border: 2px solid #fdba74;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      background: #ea580c;
      border-radius: 50%;
      box-shadow: 0 0 10px #ea580c;
    }

    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 900;
      color: #0f172a;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-highlight {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: #2563eb;
      display: inline;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-buttons {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-main-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 16px 36px;
      font-size: 17px;
      font-weight: 800;
      color: #ffffff !important;
      background: linear-gradient(135deg, #ff007a 0%, #7928ca 50%, #4338ca 100%);
      border-radius: 50px;
      box-shadow: 0 10px 25px rgba(255, 0, 122, 0.35);
      border: none;
      cursor: pointer;
    }

    .btn-main-primary:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 14px 30px rgba(255, 0, 122, 0.45);
    }

    .btn-main-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 16px 32px;
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 50px;
      box-shadow: var(--shadow-sm);
    }

    .btn-main-secondary:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      transform: translateY(-2px);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 2px solid #e2e8f0;
      box-shadow: var(--shadow-md);
    }

    .metric-card {
      text-align: center;
      padding: 12px;
    }

    .metric-num {
      font-size: 32px;
      font-weight: 900;
      color: #2563eb;
      margin-bottom: 4px;
      display: block;
    }

    .metric-card:nth-child(2) .metric-num { color: #d946ef; }
    .metric-card:nth-child(3) .metric-num { color: #f97316; }
    .metric-card:nth-child(4) .metric-num { color: #10b981; }

    .metric-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
    }

    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: #f1f5f9;
      border-top: 1px solid #e2e8f0;
      border-bottom: 1px solid #e2e8f0;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: #e0e7ff;
      color: #3730a3;
      font-size: 12px;
      font-weight: 700;
      border-radius: 30px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 30px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto;
    }

    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 700;
      color: #1e293b;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }

    .model-pill:hover {
      border-color: #ec4899;
      color: #ec4899;
      transform: translateY(-2px);
    }

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      align-items: center;
    }

    .card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #93c5fd;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: #eff6ff;
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 16px;
      font-weight: 900;
    }

    .card-badge {
      align-self: flex-start;
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
      margin-bottom: 10px;
      background: #fdf2f8;
      color: #db2777;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-link {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-color);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

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

    .step-item {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 2px solid #e2e8f0;
      position: relative;
    }

    .step-badge {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, #f59e0b, #ef4444);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    .step-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .table-container {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid #cbd5e1;
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .data-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .data-table th, .data-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #e2e8f0;
    }

    .data-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #1e293b;
    }

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

    .data-table tr:hover td {
      background: #f8fafc;
    }

    .rating-badge {
      background: #fef08a;
      color: #854d0e;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 800;
      display: inline-block;
      font-size: 12px;
    }

    .img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 2px solid #e2e8f0;
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }

    .img-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .img-box:hover img {
      transform: scale(1.02);
    }

    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-toggle {
      font-size: 20px;
      font-weight: 400;
      color: #94a3b8;
      transition: transform 0.25s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px dashed #f1f5f9;
      margin-top: -4px;
      padding-top: 14px;
    }

    .faq-item.active {
      border-color: #93c5fd;
      box-shadow: var(--shadow-sm);
    }

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

    .faq-item.active .faq-toggle {
      transform: rotate(45deg);
      color: var(--primary-color);
    }

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

    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-body {
      font-size: 14px;
      color: #334155;
      line-height: 1.65;
      margin-bottom: 20px;
      font-style: italic;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .user-avatar-tag {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #6366f1, #a855f7);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 14px;
    }

    .user-name {
      font-weight: 700;
      font-size: 14px;
    }

    .user-title {
      font-size: 12px;
      color: var(--text-muted);
    }

    .form-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 2px solid #e2e8f0;
      box-shadow: var(--shadow-md);
    }

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

    .form-group-full {
      grid-column: span 2;
    }

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 6px;
      color: #1e293b;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: all 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary-color);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    .contact-pane {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-icon-badge {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: #e0e7ff;
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
    }

    .contact-val {
      font-size: 15px;
      font-weight: 700;
      color: #1e293b;
    }

    .contact-sub {
      font-size: 12px;
      color: var(--text-muted);
    }

    .article-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .article-item {
      background: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .article-item:hover {
      border-color: #3b82f6;
    }

    .article-title-text {
      font-size: 14px;
      font-weight: 600;
      color: #334155;
    }

    .article-btn {
      font-size: 12px;
      font-weight: 700;
      color: #2563eb;
      background: #eff6ff;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px;
      border-top: 4px solid #2563eb;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      font-size: 20px;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
      color: #94a3b8;
      max-width: 320px;
      margin-bottom: 16px;
    }

    .footer-col h5 {
      font-size: 15px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-col a {
      font-size: 13px;
      color: #94a3b8;
    }

    .footer-col a:hover {
      color: #38bdf8;
    }

    .footer-qr-wrap {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .footer-qr-img {
      width: 100px;
      height: 100px;
      background: #fff;
      padding: 4px;
      border-radius: 8px;
    }

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

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

    .friend-links-title {
      font-size: 13px;
      font-weight: 700;
      color: #e2e8f0;
      margin-bottom: 10px;
    }

    .friend-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-flex a {
      font-size: 12px;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 12px;
      border-radius: 4px;
    }

    .friend-links-flex a:hover {
      color: #38bdf8;
      background: #334155;
    }

    .footer-copyright {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
      color: #64748b;
    }

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

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--text-main);
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
      border: 1px solid #cbd5e1;
      cursor: pointer;
      transition: all 0.2s;
    }

    .float-btn-primary {
      background: var(--primary-gradient);
      color: #ffffff;
      border: none;
    }

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

    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-flow {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 2px solid #e2e8f0;
        padding: 16px 0;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.open {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        padding: 12px 20px;
        width: 100%;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .grid-2, .grid-3, .grid-4, .review-grid, .article-list, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .step-flow {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        padding: 24px 16px;
      }
    }