:root {
      --primary: #4F46E5;
      --primary-accent: #EC4899;
      --accent-warm: #F59E0B;
      --accent-cyan: #06B6D4;
      --text-dark: #1E1B4B;
      --text-muted: #4B5563;
      --bg-light: #FAFAFC;
      --card-bg: #FFFFFF;
      --card-border: rgba(99, 102, 241, 0.14);
      --card-shadow: 0 10px 30px -5px rgba(79, 70, 229, 0.08), 0 4px 12px -2px rgba(236, 72, 153, 0.05);
      --radius: 16px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      background-image: 
        radial-gradient(at 0% 0%, rgba(236, 72, 153, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(79, 70, 229, 0.1) 0px, transparent 50%),
        radial-gradient(at 50% 100%, rgba(6, 182, 212, 0.08) 0px, transparent 50%);
      background-attachment: fixed;
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(79, 70, 229, 0.1);
    }

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

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

    .brand-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 600;
      font-size: 14px;
      padding: 8px 12px;
      border-radius: 8px;
      transition: var(--transition);
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.06);
    }

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

    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      background: linear-gradient(135deg, #EC4899 0%, #8B5CF6 50%, #4F46E5 100%);
      color: #FFFFFF !important;
      font-weight: 700;
      font-size: 14px;
      border-radius: 30px;
      text-decoration: none;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(236, 72, 153, 0.35);
      transition: var(--transition);
    }

    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
      color: #FFFFFF;
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      background: #FFFFFF;
      color: var(--primary) !important;
      font-weight: 700;
      font-size: 14px;
      border-radius: 30px;
      text-decoration: none;
      border: 1.5px solid rgba(79, 70, 229, 0.3);
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      background: rgba(79, 70, 229, 0.05);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }

    .section-block {
      padding: 60px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 40px auto;
    }

    .badge-pill {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(135deg, rgba(236, 72, 153, 0.12), rgba(79, 70, 229, 0.12));
      border: 1px solid rgba(236, 72, 153, 0.25);
      color: #D946EF;
      font-weight: 700;
      font-size: 13px;
      border-radius: 30px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .hero-box {
      padding: 60px 0 40px 0;
      text-align: center;
      position: relative;
    }

    .hero-h1 {
      font-size: 42px;
      font-weight: 900;
      color: var(--text-dark);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #EC4899, #8B5CF6, #06B6D4);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 30px auto;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--card-border);
      text-align: left;
    }

    .hero-stat-card {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .hero-stat-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      background: linear-gradient(135deg, rgba(236, 72, 153, 0.15), rgba(79, 70, 229, 0.15));
      color: var(--primary);
      flex-shrink: 0;
    }

    .hero-stat-text h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
    }

    .hero-stat-text p {
      font-size: 13px;
      color: var(--text-muted);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .content-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .content-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 36px rgba(79, 70, 229, 0.12);
      border-color: rgba(236, 72, 153, 0.35);
    }

    .card-tag {
      align-self: flex-start;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary);
      margin-bottom: 14px;
    }

    .card-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    .card-p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

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

    .model-chip {
      background: #FFFFFF;
      border: 1px solid rgba(79, 70, 229, 0.15);
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-dark);
      box-shadow: 0 2px 6px rgba(0,0,0,0.03);
      transition: var(--transition);
    }

    .model-chip:hover {
      border-color: var(--primary-accent);
      color: var(--primary-accent);
      transform: scale(1.05);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--card-border);
      padding: 8px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    th, td {
      padding: 16px 20px;
      font-size: 14px;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    th {
      background: rgba(79, 70, 229, 0.04);
      font-weight: 700;
      color: var(--text-dark);
    }

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

    .score-badge {
      display: inline-block;
      padding: 4px 10px;
      background: #ECFDF5;
      color: #059669;
      font-weight: 800;
      border-radius: 20px;
      border: 1px solid #A7F3D0;
    }

    .img-box {
      border-radius: 12px;
      overflow: hidden;
      margin-top: 16px;
      border: 1px solid rgba(79, 70, 229, 0.1);
      background: #f1f5f9;
    }

    .img-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

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

    .step-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--card-shadow);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, #EC4899, #8B5CF6);
      color: #FFFFFF;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      margin-bottom: 14px;
    }

    .faq-container {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 15px;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .faq-card.active .faq-icon {
      transform: rotate(180deg);
    }

    .form-wrapper {
      max-width: 760px;
      margin: 0 auto;
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--card-shadow);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-weight: 700;
      font-size: 14px;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #CBD5E1;
      border-radius: 8px;
      font-size: 14px;
      color: var(--text-dark);
      outline: none;
      transition: var(--transition);
      background: #FAFAFC;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    footer {
      background: #111827;
      color: #9CA3AF;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1F2937;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }

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

    .footer-col ul li a, .footer-col ul li {
      color: #9CA3AF;
      text-decoration: none;
      font-size: 13px;
      transition: var(--transition);
    }

    .footer-col ul li a:hover {
      color: #FFFFFF;
    }

    .footer-qr-card {
      background: #1F2937;
      padding: 12px;
      border-radius: 8px;
      display: inline-block;
      text-align: center;
      border: 1px solid #374151;
    }

    .footer-qr-card img {
      width: 110px;
      height: 110px;
      display: block;
      margin-bottom: 6px;
      border-radius: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #1F2937;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #6B7280;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-bottom: 16px;
    }

    .friend-links a {
      color: #9CA3AF;
      text-decoration: none;
      font-size: 13px;
      transition: var(--transition);
    }

    .friend-links a:hover {
      color: #FFFFFF;
    }

    .float-contact {
      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: linear-gradient(135deg, #EC4899, #4F46E5);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(79, 70, 229, 0.4);
      cursor: pointer;
      text-decoration: none;
      font-size: 20px;
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    @media (max-width: 992px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-h1 {
        font-size: 32px;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.active a {
        width: 100%;
        padding: 10px 0;
      }
    }

    @media (max-width: 600px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 26px;
      }
      .hero-h1 {
        font-size: 28px;
      }
    }