:root {
      --primary: #0d9488;
      --primary-dark: #0f766e;
      --primary-light: #ccfbf1;
      --primary-gradient: linear-gradient(135deg, #0d9488 0%, #0284c7 100%);
      --accent-cyan: #06b6d4;
      --text-main: #1e293b;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-alt: #f1f5f9;
      --border-color: #e2e8f0;
      --card-shadow: 0 10px 25px -5px rgba(13, 148, 136, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --hover-shadow: 0 20px 30px -10px rgba(13, 148, 136, 0.15), 0 10px 15px -5px rgba(0, 0, 0, 0.05);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-max: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background: linear-gradient(180deg, #f0fdfa 0%, #f8fafc 400px, #f8fafc 100%);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

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

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

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-menu {
      display: flex;
      align-items: center;
    }

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

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

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: var(--primary-light);
    }

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

    .btn-nav-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      padding: 9px 20px;
      font-size: 0.9rem;
      font-weight: 600;
      border-radius: 50px;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
    }

    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(13, 148, 136, 0.35);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* Common Section Styles */
    section {
      padding: 72px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .badge {
      display: inline-block;
      padding: 5px 14px;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--primary-dark);
      background: var(--primary-light);
      border-radius: 50px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 80px 0 64px;
      background: linear-gradient(180deg, #ecfdf5 0%, #f0fdfa 60%, #f8fafc 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-container {
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(13, 148, 136, 0.1);
      border: 1px solid rgba(13, 148, 136, 0.2);
      border-radius: 50px;
      color: var(--primary-dark);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: #0f172a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.18rem;
      color: var(--text-muted);
      max-width: 860px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-hero-main {
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 14px 36px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 50px;
      box-shadow: 0 10px 20px rgba(13, 148, 136, 0.3);
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }

    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 26px rgba(13, 148, 136, 0.4);
      color: #ffffff;
    }

    .btn-hero-sub {
      background: #ffffff;
      color: var(--text-main);
      padding: 14px 32px;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 50px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
    }

    .btn-hero-sub:hover {
      background: var(--bg-alt);
      color: var(--primary);
      border-color: var(--primary);
    }

    .hero-data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
    }

    .hero-data-card {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid rgba(226, 232, 240, 0.8);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      backdrop-filter: blur(8px);
      box-shadow: var(--card-shadow);
    }

    .hero-data-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .hero-data-label {
      font-size: 0.88rem;
      color: var(--text-light);
      font-weight: 500;
    }

    /* Model Cloud Bar */
    .model-cloud-wrapper {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
    }

    .model-cloud-title {
      text-align: center;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-light);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 16px;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px 12px;
    }

    .model-tag {
      font-size: 0.82rem;
      background: var(--bg-alt);
      color: var(--text-muted);
      padding: 5px 12px;
      border-radius: 6px;
      font-weight: 500;
      border: 1px solid #edf2f7;
    }

    /* Features / Services Grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

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

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--hover-shadow);
      border-color: rgba(13, 148, 136, 0.4);
    }

    .feature-icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary-dark);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

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

    /* Visual Media & Scenarios */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      align-items: stretch;
      margin-bottom: 40px;
    }

    .media-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
    }

    .media-img-wrap {
      width: 100%;
      background: #f1f5f9;
      overflow: hidden;
    }

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

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

    .media-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .media-content h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .media-content p {
      font-size: 0.94rem;
      color: var(--text-muted);
    }

    /* Comparison Table */
    .table-container {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      overflow-x: auto;
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comp-table th,
    .comp-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .comp-table th {
      background: var(--bg-alt);
      color: var(--text-main);
      font-weight: 700;
    }

    .comp-table tr.highlight-row {
      background: #f0fdfa;
    }

    .comp-table tr.highlight-row td {
      color: var(--primary-dark);
      font-weight: 600;
    }

    .score-badge {
      display: inline-block;
      padding: 4px 10px;
      background: #fef08a;
      color: #854d0e;
      border-radius: 4px;
      font-weight: 800;
      font-size: 0.85rem;
    }

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

    .step-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary);
      opacity: 0.3;
      margin-bottom: 10px;
      line-height: 1;
    }

    .step-box h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* Testimonials */
    .testimonial-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

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

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

    .user-meta h4 {
      font-size: 1rem;
      font-weight: 700;
    }

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

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

    .test-rating {
      color: #f59e0b;
      margin-top: 12px;
      font-size: 0.9rem;
    }

    /* FAQ Accordion */
    .faq-wrapper {
      max-width: 880px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fdfdfd;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #f1f5f9;
    }

    /* Contact & Form Section */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .contact-form-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 30px;
      box-shadow: var(--card-shadow);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #fafafa;
      outline: none;
      transition: border-color 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }

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

    .btn-submit {
      width: 100%;
      background: var(--primary-gradient);
      color: #ffffff;
      border: none;
      padding: 14px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(13, 148, 136, 0.25);
      transition: all 0.25s ease;
    }

    .btn-submit:hover {
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.35);
      transform: translateY(-1px);
    }

    .contact-info-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 30px;
      box-shadow: var(--card-shadow);
    }

    .info-list {
      list-style: none;
      margin-bottom: 28px;
    }

    .info-list li {
      margin-bottom: 14px;
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .info-list li strong {
      color: var(--text-main);
      min-width: 80px;
    }

    .qr-container {
      background: var(--bg-alt);
      padding: 20px;
      border-radius: var(--radius-sm);
      text-align: center;
      border: 1px solid var(--border-color);
    }

    .qr-container img {
      max-width: 140px;
      margin: 0 auto 10px;
      border-radius: 6px;
    }

    .qr-container span {
      font-size: 0.85rem;
      color: var(--text-light);
      display: block;
    }

    /* Article & Promo Section */
    .article-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--card-shadow);
      margin-top: 36px;
    }

    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-links a {
      font-size: 0.88rem;
      color: var(--primary-dark);
      background: var(--primary-light);
      padding: 6px 14px;
      border-radius: 4px;
    }

    .article-links a:hover {
      background: var(--primary);
      color: #ffffff;
    }

    .banner-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .banner-item {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand h3 {
      color: #ffffff;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

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

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

    .friendly-links-wrap {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
    }

    .friendly-links-wrap h5 {
      color: #cbd5e1;
      font-size: 0.85rem;
      margin-bottom: 10px;
    }

    .friendly-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px 18px;
    }

    .friendly-links-list a {
      font-size: 0.82rem;
      color: #64748b;
    }

    .friendly-links-list a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* Floating Customer Service */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      background: var(--primary-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: 0 6px 16px rgba(13, 148, 136, 0.4);
      cursor: pointer;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.05);
    }

    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      display: none;
      width: 140px;
      text-align: center;
    }

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

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

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.2rem; }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 15px rgba(0,0,0,0.05);
        display: none;
      }
      .nav-menu.open { display: flex; }
      .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0;
      }
      .nav-links li { width: 100%; text-align: center; margin-bottom: 8px; }
      .header-actions { display: none; }
      
      .hero-title { font-size: 1.8rem; }
      .hero-data-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3, .grid-4, .media-card-grid, .contact-grid, .banner-grid {
        grid-template-columns: 1fr;
      }
      .steps-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }