:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --primary-light: #d1fae5;
      --mint-bg: #f2fbf7;
      --mint-subtle: #e6f7ef;
      --mint-border: #a7f3d0;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --white: #ffffff;
      --card-bg: #ffffff;
      --card-border: #e2f4ea;
      --shadow-sm: 0 1px 3px rgba(16, 185, 129, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
      --shadow-md: 0 4px 14px rgba(16, 185, 129, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 12px 28px rgba(16, 185, 129, 0.12), 0 4px 10px rgba(0, 0, 0, 0.04);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.25s ease;
    }

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

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

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

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--card-border);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.02em;
    }

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

    .nav-links li {
      display: inline-block;
    }

    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-dark);
      background-color: var(--mint-subtle);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.92rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: var(--white);
      box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
    }

    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
    }

    .btn-outline {
      border-color: var(--primary);
      color: var(--primary-dark);
      background-color: transparent;
    }

    .btn-outline:hover {
      background-color: var(--mint-subtle);
    }

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.85rem;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 6px;
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(180deg, rgba(230, 247, 239, 0.7) 0%, rgba(242, 251, 247, 0.3) 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--card-border);
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background-color: var(--white);
      border: 1px solid var(--mint-border);
      color: var(--primary-dark);
      padding: 6px 16px;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 800;
      color: #0d291e;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-cta-main {
      padding: 14px 32px;
      font-size: 1.05rem;
      border-radius: 30px;
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
    }

    .hero-cta-main:hover {
      box-shadow: 0 8px 24px rgba(16, 185, 129, 0.45);
      transform: translateY(-2px);
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      margin-top: 10px;
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--card-border);
    }

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

    .stat-value {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* Section Base */
    .section {
      padding: 64px 0;
      border-bottom: 1px solid #eef7f2;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 44px;
    }

    .section-tag {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #111827;
      margin-bottom: 12px;
    }

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

    /* Cards Grid */
    .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: 28px;
    }

    .card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 44px;
      height: 44px;
      background: var(--mint-subtle);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-dark);
      font-size: 1.25rem;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #1f2937;
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Media Banner Section */
    .promo-banner {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--card-border);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      margin-bottom: 40px;
      display: grid;
      grid-template-columns: 1.2fr 1fr;
    }

    .banner-img-box {
      background-color: #e6f7ef;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .banner-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .banner-content-box {
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    /* Model Tags Flow */
    .model-tags-wrap {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }

    .tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 16px;
    }

    .model-tag {
      background: var(--mint-bg);
      border: 1px solid var(--mint-border);
      color: var(--primary-dark);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary);
      color: var(--white);
      transform: translateY(-2px);
    }

    /* Comparison Table */
    .compare-container {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .compare-badge-header {
      background: linear-gradient(90deg, #10b981 0%, #059669 100%);
      color: #ffffff;
      padding: 16px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
    }

    .compare-score {
      font-size: 1.3rem;
      background: rgba(255, 255, 255, 0.2);
      padding: 4px 16px;
      border-radius: 20px;
    }

    .table-scroll {
      overflow-x: auto;
    }

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

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f0fdf4;
    }

    .compare-table th {
      background-color: #f7fdfa;
      color: var(--text-main);
      font-weight: 700;
    }

    .compare-table tr:hover {
      background-color: #fafffc;
    }

    .highlight-col {
      background-color: #f0fdf4;
      font-weight: 600;
      color: var(--primary-dark);
    }

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

    .step-box {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: var(--white);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
    }

    /* Testimonials */
    .testimonial-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

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

    .user-meta h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    .quote-content {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      font-style: italic;
    }

    /* Gallery / Material Images */
    .media-card {
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--card-border);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-card .aspect-wrap {
      width: 100%;
      height: 220px;
      background: #e6f7ef;
      overflow: hidden;
    }

    .media-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .media-card:hover img {
      transform: scale(1.03);
    }

    .media-body {
      padding: 18px;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
      user-select: none;
    }

    .faq-question:hover {
      background: var(--mint-bg);
      color: var(--primary-dark);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fafdfc;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 20px;
      border-top: 1px solid #f0fdf4;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
    }

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

    /* Form Section */
    .form-wrapper {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-md);
      padding: 40px;
      max-width: 760px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

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

    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      padding: 12px 16px;
      border: 1px solid #d1fae5;
      background: #fafdfc;
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
      background: var(--white);
    }

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

    /* Articles Section */
    .article-links-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 14px;
    }

    .article-list li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .article-list a {
      color: var(--text-muted);
      font-size: 0.92rem;
    }

    .article-list a:hover {
      color: var(--primary-dark);
      text-decoration: underline;
    }

    /* Footer */
    .footer {
      background: #0f1f18;
      color: #cbd5e1;
      padding: 56px 0 24px;
      border-top: 1px solid #163628;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 18px;
      font-weight: 600;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.88rem;
    }

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

    .footer-links a:hover {
      color: var(--primary-light);
    }

    .footer-contact-info {
      font-size: 0.88rem;
      line-height: 1.8;
      color: #94a3b8;
    }

    .footer-contact-info strong {
      color: #ffffff;
    }

    .qr-box {
      margin-top: 12px;
      width: 100px;
      background: #ffffff;
      padding: 6px;
      border-radius: 6px;
    }

    .qr-box img {
      width: 100%;
      height: auto;
    }

    .friendship-links {
      padding-top: 24px;
      border-top: 1px solid #1f3b2d;
      margin-bottom: 24px;
      font-size: 0.85rem;
      color: #94a3b8;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friendship-links a {
      color: #cbd5e1;
    }

    .friendship-links a:hover {
      color: var(--primary-light);
    }

    .footer-bottom {
      padding-top: 20px;
      border-top: 1px solid #1a3025;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* Float Service Tool */
    .float-dock {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .dock-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--white);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-dark);
      cursor: pointer;
      font-size: 1.1rem;
      transition: var(--transition);
      position: relative;
    }

    .dock-btn:hover {
      background: var(--primary);
      color: var(--white);
      transform: scale(1.08);
    }

    .dock-qr-popup {
      display: none;
      position: absolute;
      right: 58px;
      bottom: 0;
      background: var(--white);
      padding: 12px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      width: 140px;
      text-align: center;
      border: 1px solid var(--card-border);
    }

    .dock-qr-popup img {
      width: 100%;
      height: auto;
    }

    .dock-qr-popup span {
      display: block;
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    .dock-kefu:hover .dock-qr-popup {
      display: block;
    }

    /* Responsive */
    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .promo-banner {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--card-border);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .flow-steps {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }