:root {
      --primary-color: #ff3366;
      --secondary-color: #00d2ff;
      --accent-color: #7928ca;
      --highlight-color: #ff9900;
      --bg-main: #fbfbfe;
      --bg-alt: #f4f6fb;
      --bg-card: #ffffff;
      --text-main: #131b2e;
      --text-muted: #5c677d;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px rgba(121, 40, 202, 0.08);
      --shadow-lg: 0 18px 40px rgba(255, 51, 102, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --container-max: 1200px;
      --transition: all 0.28s ease;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 51, 102, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 70%, rgba(0, 210, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 50% 90%, rgba(121, 40, 202, 0.03) 0%, transparent 50%);
    }

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

    ul, ol {
      list-style: none;
    }

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

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #0f172a;
    }

    .brand-title span {
      color: var(--primary-color);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-link-item {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #334155;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      white-space: nowrap;
    }

    .nav-link-item:hover {
      color: var(--primary-color);
      background-color: rgba(255, 51, 102, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: 999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .btn:active {
      transform: scale(0.98);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color) 0%, #ff6b3d 100%);
      color: #ffffff;
      border: none;
      box-shadow: 0 6px 18px rgba(255, 51, 102, 0.35);
    }

    .btn-primary:hover {
      opacity: 0.95;
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(255, 51, 102, 0.45);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border-color: #cbd5e1;
    }

    .btn-outline:hover {
      background: #f8fafc;
      border-color: var(--accent-color);
      color: var(--accent-color);
      transform: translateY(-2px);
    }

    .btn-gradient {
      background: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
      color: #ffffff;
    }

    .btn-gradient:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(121, 40, 202, 0.35);
    }

    .mobile-menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2.5px;
      background-color: #1e293b;
      border-radius: 2px;
      transition: var(--transition);
    }

    .hero-section {
      padding: 70px 0 55px;
      background: linear-gradient(180deg, #ffffff 0%, var(--bg-alt) 100%);
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(90deg, rgba(255, 51, 102, 0.1) 0%, rgba(0, 210, 255, 0.1) 100%);
      border: 1px solid rgba(255, 51, 102, 0.25);
      color: var(--primary-color);
      padding: 6px 18px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 22px;
    }

    .hero-tag-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary-color);
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.4); opacity: 0.6; }
    }

    .hero-title {
      font-size: 2.55rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -0.8px;
      margin-bottom: 20px;
      color: #0b1120;
    }

    .hero-title .gradient-text {
      background: linear-gradient(135deg, #ff0055 0%, #7928ca 50%, #00a2ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      padding-top: 30px;
      border-top: 1px dashed #cbd5e1;
    }

    .metric-card {
      background: #ffffff;
      padding: 16px 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid #eef2f6;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 51, 102, 0.3);
    }

    .metric-value {
      font-size: 1.8rem;
      font-weight: 900;
      color: #0f172a;
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .metric-value.color-1 { color: #ff3366; }
    .metric-value.color-2 { color: #7928ca; }
    .metric-value.color-3 { color: #0084ff; }
    .metric-value.color-4 { color: #059669; }

    .metric-label {
      font-size: 0.85rem;
      font-weight: 600;
      color: #64748b;
    }

    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-subtitle {
      text-transform: uppercase;
      font-size: 0.85rem;
      font-weight: 800;
      letter-spacing: 1.2px;
      color: var(--accent-color);
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

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

    .badge-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 25px;
    }

    .badge-pill {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      color: #334155;
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 0.82rem;
      font-weight: 700;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.02);
      transition: var(--transition);
    }

    .badge-pill:hover {
      background: var(--primary-color);
      color: #ffffff;
      border-color: var(--primary-color);
      transform: translateY(-2px);
    }

    .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: 30px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
      box-shadow: var(--shadow-sm);
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(121, 40, 202, 0.3);
    }

    .feature-icon-box {
      width: 46px;
      height: 46px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.2rem;
      margin-bottom: 16px;
      color: #ffffff;
    }

    .feature-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #0f172a;
    }

    .feature-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fef2f2;
      border: 1px solid #fee2e2;
      color: #b91c1c;
      padding: 4px 12px;
      border-radius: 999px;
      font-weight: 800;
      font-size: 0.9rem;
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      font-size: 0.92rem;
      border-bottom: 1px solid #f1f5f9;
    }

    .custom-table th {
      background-color: #f8fafc;
      font-weight: 800;
      color: #1e293b;
    }

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

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

    .custom-table .highlight-col {
      background-color: rgba(255, 51, 102, 0.02);
      font-weight: 700;
      color: var(--primary-color);
    }

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

    .step-number {
      display: inline-block;
      width: 32px;
      height: 32px;
      line-height: 32px;
      text-align: center;
      border-radius: 50%;
      background: var(--primary-color);
      color: #ffffff;
      font-weight: 800;
      font-size: 0.9rem;
      margin-bottom: 12px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .case-img-box {
      width: 100%;
      overflow: hidden;
      background-color: #f1f5f9;
    }

    .case-img-box img {
      width: 100%;
      height: auto;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

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

    .case-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .case-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 14px;
    }

    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

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

    .faq-question {
      width: 100%;
      padding: 16px 20px;
      text-align: left;
      background: none;
      border: none;
      font-size: 1rem;
      font-weight: 700;
      color: #1e293b;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      transition: transform 0.25s ease;
      color: var(--primary-color);
    }

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

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px dashed #f1f5f9;
      margin-top: -4px;
      padding-top: 14px;
    }

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

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ff3366, #ff9900);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
    }

    .review-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: #0f172a;
    }

    .review-role {
      font-size: 0.8rem;
      color: #64748b;
    }

    .review-text {
      font-size: 0.9rem;
      color: #475569;
      line-height: 1.6;
      font-style: italic;
    }

    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 35px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: #1e293b;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: #0f172a;
      transition: var(--transition);
      background-color: #fafbfd;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.12);
      background-color: #ffffff;
    }

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

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 14px;
      background: #ffffff;
      padding: 14px 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .contact-info-icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: rgba(0, 210, 255, 0.12);
      color: #0284c7;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    .qr-container {
      background: #ffffff;
      padding: 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      max-width: 220px;
      margin: 10px 0;
    }

    .qr-container img {
      margin: 0 auto 10px;
      max-width: 160px;
      border-radius: var(--radius-sm);
    }

    .article-item {
      background: #ffffff;
      padding: 18px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }

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

    .article-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: #1e293b;
    }

    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 45px;
    }

    .footer-title {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

    .footer-links a:hover {
      color: #ff3366;
      padding-left: 4px;
    }

    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
      color: #64748b;
    }

    .friend-links-box {
      background: rgba(255, 255, 255, 0.03);
      padding: 18px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
    }

    .friend-links-title {
      font-size: 0.88rem;
      font-weight: 700;
      color: #e2e8f0;
      margin-bottom: 10px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friend-links-list a {
      color: #94a3b8;
      font-size: 0.85rem;
    }

    .friend-links-list a:hover {
      color: #ff3366;
    }

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

    .dock-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0f172a;
      cursor: pointer;
      transition: var(--transition);
      font-weight: 700;
      font-size: 0.9rem;
    }

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

    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 2.1rem;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: flex;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.06);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-link-item {
        width: 100%;
        padding: 12px 0;
        border-bottom: 1px solid #f1f5f9;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .btn {
        width: 100%;
      }
      .hero-actions {
        flex-direction: column;
      }
    }