:root {
      --primary: #ff4d00;
      --primary-hover: #e04400;
      --secondary: #7928ca;
      --accent-cyan: #0070f3;
      --accent-yellow: #ffb800;
      --bg-page: #f9f9fb;
      --bg-surface: #ffffff;
      --text-main: #111827;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --border-color: #f0e6e0;
      --card-border: #f3eae5;
      --shadow-sm: 0 4px 12px rgba(255, 77, 0, 0.04);
      --shadow-md: 0 10px 25px rgba(255, 77, 0, 0.08);
      --shadow-lg: 0 16px 36px rgba(121, 40, 202, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

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

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

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

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid #ffe8df;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
    }

    .brand-logo .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 {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: #fff3ed;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 30px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #ff4d00 0%, #ff007a 100%);
      color: #ffffff;
      box-shadow: 0 6px 16px rgba(255, 77, 0, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 77, 0, 0.35);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--secondary);
      border-color: #eedaff;
      box-shadow: 0 4px 10px rgba(121, 40, 202, 0.08);
    }

    .btn-secondary:hover {
      background: #faf4ff;
      border-color: var(--secondary);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 5px;
    }

    .menu-toggle span {
      width: 24px;
      height: 3px;
      background: var(--text-main);
      border-radius: 2px;
    }

    .hero-section {
      position: relative;
      padding: 70px 0 60px;
      background: radial-gradient(circle at 80% 20%, #fff0e6 0%, #ffffff 50%, #f7efff 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-content {
      max-width: 860px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 0.5px;
      padding: 6px 16px;
      background: linear-gradient(90deg, #ffe5dc 0%, #f4e8ff 100%);
      color: var(--primary);
      border: 1px solid #ffd2c2;
      border-radius: 20px;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
      background: linear-gradient(135deg, #ff4d00 0%, #7928ca 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid #fedcd0;
      box-shadow: var(--shadow-md);
    }

    .hero-stat-item {
      text-align: center;
      border-right: 1px solid #f2e9e4;
    }

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

    .hero-stat-value {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .hero-stat-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-light);
    }

    .section {
      padding: 70px 0;
      border-bottom: 1px solid #f5ece7;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 45px;
    }

    .section-tag {
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--secondary);
      background: #f4e8ff;
      padding: 4px 12px;
      border-radius: 12px;
      display: inline-block;
      margin-bottom: 10px;
    }

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

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      align-items: stretch;
    }

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

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

    .card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #ffd8cb;
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: linear-gradient(135deg, #ffefe8 0%, #fbe8ff 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-badge {
      background: #ffffff;
      border: 1px solid #fedfd3;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    }

    .model-badge:hover {
      background: #ff5e19;
      color: #ffffff;
      border-color: #ff5e19;
    }

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

    .process-step {
      background: #ffffff;
      border: 1px solid #f4e1d7;
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      position: relative;
    }

    .process-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px;
    }

    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-sm);
    }

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

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

    .media-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .media-body {
      padding: 20px;
    }

    .comparison-table-wrapper {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid #feded1;
      overflow-x: auto;
      box-shadow: var(--shadow-md);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f6e8e2;
    }

    .comparison-table th {
      background: #fff8f5;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fff0eb;
      color: var(--primary);
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 6px;
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid #f2e3db;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
    }

    .faq-question:hover {
      background: #fffaf7;
      color: var(--primary);
    }

    .faq-answer {
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
      border-top: 1px solid #faece6;
      background: #fffdfc;
    }

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

    .faq-icon {
      font-size: 18px;
      color: var(--primary);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ff7a45, #7928ca);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }

    .review-meta h4 {
      font-size: 15px;
      color: var(--text-main);
    }

    .review-meta span {
      font-size: 12px;
      color: var(--text-light);
    }

    .form-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid #feded1;
      padding: 40px;
      box-shadow: var(--shadow-lg);
      max-width: 760px;
      margin: 0 auto;
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid #e2d3cd;
      border-radius: var(--radius-sm);
      background: #fdfaf9;
      color: var(--text-main);
      outline: none;
      transition: all 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(255, 77, 0, 0.12);
    }

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

    .article-link-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .article-item {
      background: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid #f2e2da;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .article-item:hover {
      border-color: var(--primary);
      background: #fffaf7;
    }

    .article-item a {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .article-item a:hover {
      color: var(--primary);
    }

    .site-footer {
      background: #1a161f;
      color: #b0a9b8;
      padding: 60px 0 30px;
      border-top: 4px solid var(--primary);
    }

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

    .footer-brand h3 {
      color: #ffffff;
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 13px;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 16px;
    }

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

    .footer-links a {
      font-size: 13px;
      color: #a8a0b0;
    }

    .footer-links a:hover {
      color: #ff7a45;
    }

    .footer-qr-box {
      text-align: center;
      background: #25202c;
      padding: 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .footer-qr-box img {
      width: 100px;
      height: 100px;
      display: block;
      margin-bottom: 6px;
      border-radius: 4px;
    }

    .footer-qr-box span {
      font-size: 12px;
      color: #e0dbe6;
    }

    .friendship-links {
      border-top: 1px solid #2b2533;
      padding: 24px 0;
      margin-bottom: 24px;
      font-size: 13px;
    }

    .friendship-links span {
      color: #ffffff;
      font-weight: 700;
      margin-right: 12px;
    }

    .friendship-links a {
      color: #938a9d;
      margin-right: 14px;
      display: inline-block;
    }

    .friendship-links a:hover {
      color: #ff7a45;
    }

    .footer-bottom {
      border-top: 1px solid #2b2533;
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
      color: #797183;
    }

    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), #ff007a);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(255, 77, 0, 0.4);
      cursor: pointer;
      border: none;
      font-size: 13px;
      font-weight: bold;
      transition: all 0.3s ease;
    }

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

    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: flex;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 30px;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .grid-4 {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .article-link-list {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        padding: 24px;
      }
    }