:root {
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      --bg-base: #fbfbfd;
      --bg-card: #ffffff;
      --text-main: #1d2129;
      --text-muted: #4e5969;
      --text-sub: #86909c;
      --border-color: #e5e6eb;
      --rainbow-c1: #ff4d4f;
      --rainbow-c2: #ff7a45;
      --rainbow-c3: #ffa940;
      --rainbow-c4: #52c41a;
      --rainbow-c5: #13c2c2;
      --rainbow-c6: #1677ff;
      --rainbow-c7: #722ed1;
      --rainbow-gradient: linear-gradient(135deg, #ff4d4f 0%, #fa8c16 18%, #fadb14 36%, #52c41a 52%, #13c2c2 68%, #1677ff 84%, #722ed1 100%);
      --soft-rainbow-bg: linear-gradient(180deg, #f0f5ff 0%, #f6ffed 30%, #fff7e6 70%, #fff0f6 100%);
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.08);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    .main-container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .rainbow-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      background: #ffffff;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(22, 119, 255, 0.2);
      color: #1677ff;
    }

    .rainbow-border {
      position: relative;
      border-radius: var(--radius-md);
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .rainbow-border:hover {
      border-color: transparent;
      box-shadow: var(--shadow-md);
      outline: 2px solid #1677ff;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 999px;
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      border: none;
      outline: none;
      transition: var(--transition);
      text-align: center;
    }

    .btn-rainbow {
      background: var(--rainbow-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 16px rgba(22, 119, 255, 0.25);
    }

    .btn-rainbow:hover {
      opacity: 0.92;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(22, 119, 255, 0.35);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

    .btn-secondary:hover {
      background: #f7f8fa;
      border-color: #c9cdd4;
    }

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

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

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

    .brand-logo-slot {
      display: flex;
      align-items: center;
      max-height: 40px;
    }

    .brand-logo-slot img {
      max-height: 38px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
    }

    .nav-links a:hover {
      color: #1677ff;
      background: rgba(22, 119, 255, 0.05);
    }

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

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

    .hero-section {
      background: var(--soft-rainbow-bg);
      padding: 80px 0 60px;
      position: relative;
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .hero-content {
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      margin: 20px 0;
      color: #0f172a;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 36px;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 24px;
    }

    .stat-card {
      background: #ffffff;
      padding: 20px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border-top: 3px solid #1677ff;
    }

    .stat-card:nth-child(2) { border-top-color: #52c41a; }
    .stat-card:nth-child(3) { border-top-color: #fa8c16; }
    .stat-card:nth-child(4) { border-top-color: #722ed1; }

    .stat-label {
      font-size: 13px;
      color: var(--text-sub);
      margin-bottom: 6px;
    }

    .stat-value {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
    }

    .section-wrap {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-top: 10px;
      margin-bottom: 14px;
    }

    .section-sub {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .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-feature {
      padding: 24px;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card-feature h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: #1d2129;
    }

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

    .model-tags-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 32px;
      padding: 24px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .model-tag {
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 500;
      color: #334155;
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: #1677ff;
      color: #ffffff;
      border-color: #1677ff;
      transform: translateY(-1px);
    }

    .img-showcase-box {
      width: 100%;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #f8fafc;
    }

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

    .eval-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .eval-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 28px;
    }

    .eval-score-badge {
      display: flex;
      align-items: baseline;
      gap: 8px;
      background: #fff0f6;
      border: 1px solid #ffadd2;
      padding: 8px 20px;
      border-radius: 999px;
    }

    .eval-score-badge .score {
      font-size: 32px;
      font-weight: 900;
      color: #eb2f96;
    }

    .eval-score-badge .stars {
      font-size: 18px;
      color: #faad14;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
    }

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

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

    .eval-table th {
      background: #f8fafc;
      font-weight: 600;
      color: var(--text-main);
    }

    .eval-table tr:hover td {
      background: #fafafa;
    }

    .eval-table .highlight {
      color: #1677ff;
      font-weight: 600;
    }

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

    .step-item {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--rainbow-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .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 var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #475569;
    }

    .author-info h4 {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .author-info span {
      font-size: 12px;
      color: var(--text-sub);
    }

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

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

    .faq-item.active {
      border-color: #1677ff;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-icon {
      font-size: 20px;
      transition: transform 0.25s ease;
      color: var(--text-sub);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: #1677ff;
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #f0f0f0;
      padding-top: 16px;
    }

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

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

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-family: inherit;
      outline: none;
      transition: var(--transition);
      background: #ffffff;
      color: var(--text-main);
    }

    .form-control:focus {
      border-color: #1677ff;
      box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .contact-qr {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #fff;
    }

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

    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .article-item-card {
      background: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 14px;
      font-weight: 500;
    }

    .article-item-card:hover {
      border-color: #1677ff;
      color: #1677ff;
    }

    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 14px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 18px;
      margin-bottom: 12px;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      margin-bottom: 16px;
      font-weight: 600;
    }

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

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

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

    .footer-links-wrap {
      padding: 20px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 13px;
    }

    .footer-links-wrap a {
      color: #cbd5e1;
    }

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

    .footer-bottom {
      text-align: center;
      font-size: 12px;
      color: #64748b;
    }

    .fixed-tools {
      position: fixed;
      right: 24px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 999;
    }

    .tool-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      transition: var(--transition);
      font-size: 18px;
      position: relative;
    }

    .tool-btn:hover {
      background: #1677ff;
      color: #ffffff;
      border-color: #1677ff;
    }

    .tool-tooltip {
      position: absolute;
      right: 56px;
      background: #1d2129;
      color: #fff;
      padding: 8px 12px;
      border-radius: 6px;
      font-size: 12px;
      white-space: nowrap;
      display: none;
      box-shadow: var(--shadow-md);
    }

    .tool-btn:hover .tool-tooltip {
      display: block;
    }

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

    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-secondary {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .grid-2, .grid-3, .grid-4, .hero-stats-grid, .flow-steps, .review-grid, .article-links-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-header {
        flex-direction: column;
        align-items: flex-start;
      }
    }