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

    :root {
      --lime: #ccff00;
      --lime-dark: #a8d600;
      --lime-glow: #b8e600;
      --neon-green: #9ef01a;
      --deep-charcoal: #1e2a1e;
      --charcoal: #2b3b2b;
      --body-bg: #f6fcf0;
      --card-bg: #ffffff;
      --text-main: #1a2e1a;
      --text-muted: #3e563e;
      --border-soft: #dcebc0;
      --shadow-sm: 0 12px 30px rgba(140, 180, 60, 0.08);
      --shadow-lift: 0 24px 44px -8px rgba(110, 150, 20, 0.18);
      --radius-card: 24px;
      --radius-btn: 50px;
      --font-base: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --max-container: 1280px;
      --pad-x: 20px;
    }

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

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

    /* fixed back to top */
    .back-top {
      position: fixed;
      bottom: 28px;
      right: 24px;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--lime);
      color: var(--deep-charcoal);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      box-shadow: 0 8px 20px rgba(160, 200, 40, 0.4);
      cursor: pointer;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s, visibility 0.3s, transform 0.2s;
      z-index: 999;
      border: 1px solid rgba(255,255,255,0.4);
    }
    .back-top.show {
      opacity: 1;
      visibility: visible;
    }
    .back-top:hover {
      transform: translateY(-4px);
      background: var(--lime-dark);
    }

    /* floating customer service */
    .float-kefu {
      position: fixed;
      bottom: 92px;
      right: 24px;
      width: 60px;
      height: 60px;
      border-radius: 30px;
      background: #fff;
      border: 2.5px solid var(--lime);
      box-shadow: 0 10px 30px rgba(110, 160, 20, 0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 998;
      cursor: pointer;
      transition: all 0.25s;
    }
    .float-kefu img {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      object-fit: contain;
    }
    .float-kefu:hover {
      transform: scale(1.06);
      border-color: var(--lime-dark);
    }

    /* header */
    .site-header {
      background: #ffffffce;
      backdrop-filter: blur(14px);
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border-soft);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-shrink: 0;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      max-width: 140px;
    }
    .brand-text {
      font-weight: 800;
      font-size: 1.28rem;
      color: var(--deep-charcoal);
      letter-spacing: -0.02em;
      margin-left: 4px;
    }
    .brand-text span {
      color: #4b8b1a;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
      flex-wrap: wrap;
    }
    .nav-links li {
      margin: 0;
    }
    .nav-links a {
      display: block;
      padding: 8px 12px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-main);
      text-decoration: none;
      border-radius: 30px;
      transition: background 0.2s, color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      background: var(--lime);
      color: var(--deep-charcoal);
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-weight: 700;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.25s;
      border: 2px solid transparent;
      font-size: 0.95rem;
      line-height: 1.2;
      cursor: pointer;
    }
    .btn-primary {
      background: var(--lime);
      color: var(--deep-charcoal);
      box-shadow: 0 6px 16px rgba(180, 220, 20, 0.35);
      border-color: var(--lime);
    }
    .btn-primary:hover {
      background: var(--lime-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 22px rgba(150, 200, 0, 0.4);
    }
    .btn-outline {
      background: transparent;
      color: var(--deep-charcoal);
      border: 2px solid var(--deep-charcoal);
    }
    .btn-outline:hover {
      background: var(--deep-charcoal);
      color: #fff;
    }
    .menu-toggle {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      cursor: pointer;
      color: var(--deep-charcoal);
      padding: 4px 8px;
    }

    /* hero */
    .hero {
      padding: 48px 0 56px;
      background: radial-gradient(circle at 80% 10%, #e6ffb3 0%, transparent 40%),
                  radial-gradient(circle at 10% 70%, #d4f0b0 0%, transparent 45%),
                  var(--body-bg);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      align-items: center;
      gap: 40px;
    }
    .hero-left h1 {
      font-size: clamp(2.2rem, 5vw, 3.6rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.03em;
      color: var(--deep-charcoal);
      margin-bottom: 18px;
    }
    .hero-left .highlight {
      background: linear-gradient(120deg, var(--lime) 0%, var(--lime) 60%, transparent 90%);
      background-size: 100% 28%;
      background-position: 0 85%;
      background-repeat: no-repeat;
      display: inline-block;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      max-width: 580px;
      margin-bottom: 28px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 36px;
    }
    .hero-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 14px;
      margin-top: 28px;
      align-items: center;
    }
    .model-badge {
      background: rgba(200, 240, 100, 0.35);
      padding: 6px 14px;
      border-radius: 40px;
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--deep-charcoal);
      border: 1px solid rgba(150, 200, 50, 0.3);
      backdrop-filter: blur(4px);
      white-space: nowrap;
    }
    .hero-right {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .metric-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .metric-card {
      background: #ffffffd9;
      backdrop-filter: blur(8px);
      border: 1px solid #e0f0b0;
      border-radius: 28px;
      padding: 22px 18px;
      box-shadow: var(--shadow-sm);
      text-align: left;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lift);
    }
    .metric-number {
      font-size: 2rem;
      font-weight: 800;
      line-height: 1.2;
      color: var(--deep-charcoal);
    }
    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .hero-visual-decoration {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #faffea;
      border-radius: 48px;
      padding: 16px 22px;
      margin-top: 8px;
      border: 1px solid #d8f0a8;
      font-weight: 600;
      color: #2e4a1a;
    }

    /* section generic */
    section {
      padding: 60px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 44px;
    }
    .section-header h2 {
      font-size: clamp(1.8rem, 3.5vw, 2.6rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--deep-charcoal);
      margin-bottom: 12px;
    }
    .section-header p {
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
      font-size: 1.05rem;
    }
    .tagline {
      display: inline-block;
      background: var(--lime);
      padding: 5px 14px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.75rem;
      color: var(--deep-charcoal);
      letter-spacing: 0.03em;
      margin-bottom: 16px;
      text-transform: uppercase;
      border: 1px solid rgba(0,0,0,0.05);
    }

    /* service grid */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 22px;
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lift);
      border-color: var(--lime);
    }
    .service-icon {
      font-size: 2rem;
      margin-bottom: 14px;
      display: inline-block;
      background: linear-gradient(140deg, var(--lime) 0%, #e2ffb0 100%);
      width: 52px;
      height: 52px;
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--deep-charcoal);
      font-weight: 700;
    }
    .service-card h3 {
      font-size: 1.22rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--deep-charcoal);
    }
    .service-card p {
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.55;
      flex: 1;
    }

    /* process steps */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 24px;
    }
    .step-item {
      text-align: left;
      background: #ffffffd0;
      border-radius: 24px;
      padding: 26px 20px;
      border: 1px solid #e4f2c4;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }
    .step-item:hover {
      border-color: var(--lime);
      background: #fff;
    }
    .step-num {
      font-size: 2rem;
      font-weight: 800;
      color: #c0e050;
      line-height: 1;
      margin-bottom: 16px;
    }
    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--deep-charcoal);
    }
    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* compare table + rating */
    .compare-section {
      background: linear-gradient(135deg, #f9ffef 0%, #edfad6 100%);
      border-radius: 48px;
      padding: 50px 36px;
      margin: 20px 0;
      border: 1px solid #d4ed9c;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 0.8fr 1.2fr;
      gap: 36px;
      align-items: center;
    }
    .rating-card {
      background: var(--deep-charcoal);
      border-radius: 32px;
      padding: 32px 28px;
      color: #f0ffe0;
      text-align: center;
    }
    .rating-card .score {
      font-size: 4.5rem;
      font-weight: 800;
      line-height: 1;
      color: var(--lime);
      letter-spacing: -0.04em;
    }
    .rating-card .max-score {
      font-size: 1.2rem;
      color: #b0d080;
    }
    .rating-stars {
      color: var(--lime);
      font-size: 2rem;
      letter-spacing: 6px;
      margin: 10px 0 8px;
    }
    .rating-recommend {
      font-weight: 700;
      font-size: 1.2rem;
      color: #ffffff;
      margin-top: 10px;
    }
    .compare-table-wrap {
      overflow-x: auto;
      border-radius: 24px;
      background: #ffffffd0;
      backdrop-filter: blur(4px);
      padding: 6px;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.92rem;
      min-width: 480px;
    }
    .compare-table th {
      text-align: left;
      padding: 16px 14px;
      background: #e9ffc4;
      font-weight: 700;
      color: var(--deep-charcoal);
      border-bottom: 2px solid #c0e070;
    }
    .compare-table td {
      padding: 14px;
      border-bottom: 1px solid #e0eec0;
      color: var(--text-main);
    }
    .highlight-badge {
      background: var(--lime);
      padding: 2px 10px;
      border-radius: 40px;
      font-size: 0.75rem;
      font-weight: 700;
      margin-left: 6px;
      color: var(--deep-charcoal);
    }

    /* reviews */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    .review-card {
      background: #fff;
      border-radius: 28px;
      padding: 26px 24px;
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
      display: flex;
      flex-direction: column;
    }
    .review-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lift);
    }
    .review-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--lime);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.2rem;
      color: var(--deep-charcoal);
      margin-bottom: 16px;
    }
    .review-text {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
      flex: 1;
      margin-bottom: 16px;
    }
    .review-user {
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--deep-charcoal);
    }
    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* case gallery */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
    }
    .case-item {
      background: #fff;
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
    }
    .case-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lift);
    }
    .case-img-wrap {
      aspect-ratio: 1 / 1;
      background: #f2fae2;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 12px;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }
    .case-caption {
      padding: 14px 16px;
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--deep-charcoal);
    }

    /* article list + form */
    .article-form-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
    }
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      background: #ffffffd0;
      border-radius: 60px;
      border: 1px solid var(--border-soft);
      transition: background 0.2s, border-color 0.2s;
      text-decoration: none;
      color: var(--text-main);
    }
    .article-item:hover {
      background: #fff;
      border-color: var(--lime);
    }
    .article-title {
      font-weight: 600;
      font-size: 0.95rem;
    }
    .article-arrow {
      color: #a0c040;
      font-weight: 700;
    }

    .form-card {
      background: #fff;
      border-radius: 32px;
      padding: 32px 28px;
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-sm);
    }
    .form-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 20px;
      color: var(--deep-charcoal);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 4px;
      color: var(--text-muted);
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d4e8b0;
      border-radius: 20px;
      font-family: inherit;
      font-size: 0.95rem;
      background: #fafff0;
      transition: 0.2s;
      color: var(--deep-charcoal);
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: var(--lime-dark);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(200, 255, 0, 0.2);
    }
    .form-group textarea {
      min-height: 80px;
      resize: vertical;
    }
    .form-submit {
      width: 100%;
      padding: 14px;
      border: none;
      border-radius: 40px;
      background: var(--lime);
      font-weight: 800;
      font-size: 1rem;
      color: var(--deep-charcoal);
      cursor: pointer;
      transition: 0.2s;
    }
    .form-submit:hover {
      background: var(--lime-dark);
      transform: scale(1.01);
    }

    /* FAQ */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffffd0;
      border-radius: 24px;
      border: 1px solid var(--border-soft);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item.active {
      border-color: var(--lime);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      color: var(--deep-charcoal);
      background: transparent;
      gap: 16px;
    }
    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      font-weight: 400;
      color: #7b9a3c;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-question::after {
      content: '−';
      transform: rotate(0deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      background: rgba(245, 255, 225, 0.5);
    }
    .faq-item.active .faq-answer {
      max-height: 260px;
      padding: 0 24px 22px 24px;
    }

    /* footer */
    .site-footer {
      background: #1b2b10;
      color: #d0e8b0;
      padding: 48px 0 28px;
      border-radius: 48px 48px 0 0;
      margin-top: 40px;
    }
    .footer-inner {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr 0.8fr 0.8fr;
      gap: 32px;
    }
    .footer-brand p {
      font-size: 0.9rem;
      margin: 16px 0;
      color: #b0d080;
      max-width: 280px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-weight: 700;
      margin-bottom: 16px;
      font-size: 1rem;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col li {
      margin-bottom: 10px;
    }
    .footer-col a {
      color: #c0d8a0;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }
    .footer-col a:hover {
      color: var(--lime);
    }
    .footer-bottom {
      text-align: center;
      border-top: 1px solid #334d22;
      margin-top: 32px;
      padding-top: 24px;
      font-size: 0.85rem;
      color: #a0b880;
    }
    .footer-bottom a {
      color: var(--lime);
      text-decoration: none;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px 20px;
      justify-content: center;
      margin-top: 16px;
    }
    .friend-links a {
      color: #b0d080;
      text-decoration: none;
      font-size: 0.82rem;
    }
    .friend-links a:hover {
      color: var(--lime);
    }

    /* responsive */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .article-form-grid {
        grid-template-columns: 1fr;
      }
      .footer-inner {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 0;
        gap: 4px;
      }
      .nav-links.open {
        display: flex;
      }
      .header-inner {
        flex-wrap: wrap;
      }
      .menu-toggle {
        display: block;
      }
      .nav-cta .btn {
        display: none;
      }
      .nav-links a {
        padding: 10px 16px;
        width: 100%;
      }
      section {
        padding: 40px 0;
      }
      .compare-section {
        padding: 30px 18px;
      }
      .footer-inner {
        grid-template-columns: 1fr;
      }
      .hero-actions .btn {
        width: 100%;
      }
      .metric-panel {
        grid-template-columns: 1fr;
      }
    }

    /* animation */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

/* 补充样式：确保所有容器使用统一宽度体系 */
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* footer 链接颜色保障 */
    .site-footer a {
      color: #c0d8a0;
      text-decoration: none;
    }
    .site-footer a:hover {
      color: #ccff00;
    }