:root {
      --primary: #ff5500;
      --primary-hover: #e04b00;
      --primary-light: #fff5ee;
      --primary-border: #ffd1b8;
      --dark: #1f2429;
      --dark-muted: #4e555d;
      --gray-bg: #f8fafc;
      --card-bg: #ffffff;
      --border-color: #eaedf1;
      --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      --shadow-sm: 0 2px 8px rgba(255, 85, 0, 0.06);
      --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 14px 34px rgba(255, 85, 0, 0.12);
      --radius: 12px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-main);
      background-color: #fafbfc;
      color: var(--dark);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

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

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

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark-muted);
      padding: 8px 12px;
      border-radius: 6px;
      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;
    }

    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #ff6b22 0%, #ff4500 100%);
      color: #ffffff !important;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: 8px;
      box-shadow: 0 4px 14px rgba(255, 69, 0, 0.35);
      border: none;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 69, 0, 0.45);
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: #ffffff;
      color: var(--dark) !important;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 9px 20px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary) !important;
      background-color: var(--primary-light);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--dark);
    }

    .menu-toggle svg {
      width: 24px;
      height: 24px;
      display: block;
    }

    .hero-section {
      position: relative;
      padding: 70px 0 60px;
      background: radial-gradient(circle at 85% 15%, #ffebe0 0%, #ffffff 55%, #fff9f5 100%);
      border-bottom: 1px solid var(--border-color);
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background-color: #ffeae0;
      color: var(--primary);
      font-weight: 600;
      font-size: 0.85rem;
      padding: 6px 16px;
      border-radius: 30px;
      margin-bottom: 20px;
      border: 1px solid var(--primary-border);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(90deg, #ff4500, #ff8c00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--dark-muted);
      line-height: 1.7;
      margin-bottom: 34px;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 10px;
    }

    .stat-item {
      background: #ffffff;
      padding: 20px 14px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s ease;
    }

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

    .stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 4px;
    }

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

    .section {
      padding: 72px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      max-width: 680px;
      margin: 0 auto 46px;
    }

    .section-subtitle {
      color: var(--primary);
      font-weight: 700;
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--dark);
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-desc {
      color: var(--dark-muted);
      font-size: 1rem;
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .about-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .about-card h3 {
      font-size: 1.4rem;
      margin-bottom: 14px;
      color: var(--dark);
    }

    .about-card p {
      color: var(--dark-muted);
      margin-bottom: 18px;
    }

    .about-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 14px;
    }

    .badge-pill {
      background: var(--primary-light);
      color: var(--primary);
      border: 1px solid var(--primary-border);
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 0.82rem;
      font-weight: 600;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .service-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-border);
    }

    .service-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--dark);
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--dark-muted);
      line-height: 1.6;
    }

    .models-cloud {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-top: 36px;
      text-align: center;
    }

    .models-title {
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 16px;
      font-size: 1.1rem;
    }

    .tag-container {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
    }

    .model-tag {
      background: #f1f4f8;
      color: #334155;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 500;
      border: 1px solid #e2e8f0;
    }

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

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

    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: #ffd8c2;
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-card h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--dark);
    }

    .step-card p {
      font-size: 0.88rem;
      color: var(--dark-muted);
    }

    .review-score-box {
      background: linear-gradient(135deg, #fff7f2 0%, #fff1eb 100%);
      border: 1px solid var(--primary-border);
      border-radius: var(--radius);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 1.5rem;
      color: var(--dark);
      margin-bottom: 6px;
    }

    .stars {
      color: #ff9800;
      font-size: 1.2rem;
      margin-bottom: 4px;
    }

    .score-number {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary);
    }

    .score-number small {
      font-size: 1.2rem;
      color: var(--dark-muted);
      font-weight: 500;
    }

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

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

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

    .custom-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--dark);
    }

    .custom-table tr:hover td {
      background-color: #fcfdfe;
    }

    .custom-table .hl {
      color: var(--primary);
      font-weight: 700;
    }

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

    .media-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }

    .media-card-body {
      padding: 20px;
    }

    .media-card-body h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
    }

    .media-card-body p {
      font-size: 0.88rem;
      color: var(--dark-muted);
    }

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

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

    .testimonial-quote {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 16px;
      position: relative;
    }

    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffe3d3;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-info h4 {
      font-size: 0.95rem;
      color: var(--dark);
    }

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

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: all 0.25s ease;
    }

    .faq-item.active {
      border-color: var(--primary-border);
    }

    .faq-header {
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--dark);
      user-select: none;
    }

    .faq-header svg {
      width: 18px;
      height: 18px;
      transition: transform 0.3s ease;
      color: var(--primary);
    }

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

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 20px;
      color: var(--dark-muted);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-body {
      max-height: 200px;
      padding: 0 20px 16px;
    }

    .form-contact-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: start;
    }

    .form-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--dark);
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.92rem;
      outline: none;
      transition: border-color 0.25s ease;
      background-color: #fafbfc;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      background-color: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    .contact-info-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 24px;
    }

    .contact-info-list li {
      font-size: 0.92rem;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--dark);
    }

    .contact-info-list li strong {
      color: var(--primary);
      min-width: 70px;
    }

    .qr-box {
      text-align: center;
      background: var(--primary-light);
      padding: 16px;
      border-radius: 8px;
      border: 1px solid var(--primary-border);
      max-width: 220px;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
      margin: 0 auto 8px;
      border-radius: 4px;
    }

    .qr-box span {
      font-size: 0.82rem;
      color: var(--dark-muted);
      font-weight: 500;
    }

    .site-footer {
      background: #111417;
      color: #94a3b8;
      padding: 50px 0 24px;
      font-size: 0.88rem;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
      padding-bottom: 30px;
      border-bottom: 1px solid #232931;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.2rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      max-width: 420px;
      line-height: 1.6;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

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

    .friend-links-box {
      padding: 20px 0;
      border-bottom: 1px solid #232931;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
      font-size: 0.85rem;
    }

    .friend-links-box strong {
      color: #ffffff;
    }

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

    .friend-links-box a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      color: #64748b;
      font-size: 0.82rem;
    }

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

    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0,0,0,0.12);
      border: 1px solid var(--border-color);
      cursor: pointer;
      color: var(--primary);
      transition: all 0.25s ease;
      position: relative;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    .float-btn svg {
      width: 20px;
      height: 20px;
    }

    .float-qr-pop {
      position: absolute;
      right: 56px;
      top: -40px;
      background: #ffffff;
      padding: 10px;
      border-radius: 8px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      display: none;
      text-align: center;
      width: 140px;
    }

    .float-qr-pop img {
      width: 120px;
      height: 120px;
      display: block;
    }

    .float-qr-pop span {
      font-size: 0.75rem;
      color: var(--dark);
      display: block;
      margin-top: 4px;
    }

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

    @media (max-width: 992px) {
      .services-grid,
      .workflow-grid,
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid,
      .form-contact-wrap,
      .footer-top {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .services-grid,
      .workflow-grid,
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .review-score-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }