:root {
      --primary: #0891b2;
      --primary-dark: #0e7490;
      --primary-light: #06b6d4;
      --accent: #14b8a6;
      --bg-main: #f4fafb;
      --bg-card: #ffffff;
      --bg-alt: #e6f4f6;
      --text-main: #132f38;
      --text-muted: #48656e;
      --border-color: rgba(8, 145, 178, 0.18);
      --border-focus: #0891b2;
      --shadow-sm: 0 4px 12px rgba(8, 145, 178, 0.06);
      --shadow-md: 0 10px 25px rgba(8, 145, 178, 0.12);
      --shadow-lg: 0 18px 36px rgba(8, 145, 178, 0.16);
      --radius: 12px;
      --radius-lg: 20px;
      --transition: all 0.28s 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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.68;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(6, 182, 212, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 90%, rgba(20, 184, 166, 0.06) 0%, transparent 45%);
      background-attachment: fixed;
    }

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

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

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

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(8, 145, 178, 0.28);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
      box-shadow: 0 6px 18px rgba(8, 145, 178, 0.38);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: var(--bg-card);
      color: var(--primary-dark);
      border-color: var(--border-color);
    }

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

    .btn-pulse {
      background: linear-gradient(135deg, #0284c7 0%, #0d9488 100%);
      color: #ffffff;
      animation: softPulse 2.5s infinite;
    }

    @keyframes softPulse {
      0% { box-shadow: 0 0 0 0 rgba(8, 145, 178, 0.4); }
      70% { box-shadow: 0 0 0 10px rgba(8, 145, 178, 0); }
      100% { box-shadow: 0 0 0 0 rgba(8, 145, 178, 0); }
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

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

    /* Section Global Styles */
    .section-wrap {
      padding: 72px 0;
      position: relative;
    }

    .section-wrap.alt-bg {
      background-color: rgba(230, 244, 246, 0.5);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      color: var(--primary-dark);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 50px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.8px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* Hero Section (Strictly No Images) */
    .hero-section {
      padding: 70px 0 80px 0;
      text-align: center;
      position: relative;
      background: linear-gradient(180deg, rgba(230, 244, 246, 0.6) 0%, rgba(244, 250, 251, 1) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-badge-glow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid rgba(8, 145, 178, 0.25);
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(8, 145, 178, 0.08);
      margin-bottom: 24px;
    }

    .hero-badge-glow .dot {
      width: 8px;
      height: 8px;
      background-color: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 8px #10b981;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #0891b2 0%, #0d9488 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: #0891b2;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      max-width: 1040px;
      margin: 0 auto;
    }

    .metric-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 22px 16px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

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

    .metric-val {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Grid & Card Utilities */
    .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(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--bg-alt);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: 700;
      border: 1px solid rgba(8, 145, 178, 0.15);
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Model Tags Cloud */
    .model-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--bg-alt);
      border-color: var(--primary);
      color: var(--primary-dark);
      transform: translateY(-2px);
    }

    /* Workflow Cards */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .scenario-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 22px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .scenario-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    .scenario-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 12px;
      padding-bottom: 10px;
      border-bottom: 1px solid rgba(8, 145, 178, 0.1);
    }

    .scenario-name {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--primary-dark);
    }

    .scenario-tag {
      font-size: 0.75rem;
      padding: 2px 8px;
      background: var(--bg-alt);
      color: var(--primary);
      border-radius: 4px;
      font-weight: 600;
    }

    .scenario-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .process-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px 20px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .process-num {
      width: 42px;
      height: 42px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      margin: 0 auto 16px auto;
      box-shadow: 0 4px 10px rgba(8, 145, 178, 0.25);
    }

    .process-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .process-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* Media & Cases Section */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
    }

    .case-visual-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .case-img-container {
      border-radius: 12px;
      overflow: hidden;
      background: #eef7f8;
    }

    .case-img-container img {
      width: 100%;
      height: auto;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

    .case-img-container:hover img {
      transform: scale(1.02);
    }

    .case-sub-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    /* Comparison Table Section */
    .comparison-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .eval-score-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      margin-bottom: 28px;
      border-bottom: 1px solid rgba(8, 145, 178, 0.15);
    }

    .eval-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .eval-big-num {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--primary-dark);
      line-height: 1;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin-bottom: 4px;
    }

    .eval-text {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(8, 145, 178, 0.12);
      font-size: 0.95rem;
    }

    .custom-table th {
      background: var(--bg-alt);
      color: var(--primary-dark);
      font-weight: 700;
    }

    .custom-table tr:hover td {
      background-color: rgba(244, 250, 251, 0.8);
    }

    .highlight-cell {
      color: var(--primary-dark);
      font-weight: 700;
      background: rgba(6, 182, 212, 0.06);
    }

    .badge-check {
      color: #10b981;
      font-weight: 700;
      margin-right: 6px;
    }

    .badge-cross {
      color: #ef4444;
      font-weight: 700;
      margin-right: 6px;
    }

    /* Reviews Section */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

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

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 14px;
      border-top: 1px solid rgba(8, 145, 178, 0.1);
    }

    .author-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--bg-alt);
      color: var(--primary-dark);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      border: 1px solid rgba(8, 145, 178, 0.2);
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--primary);
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: var(--transition);
    }

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

    .faq-question {
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 700;
      font-size: 1.02rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: rgba(244, 250, 251, 0.4);
    }

    .faq-answer-inner {
      padding: 0 22px 18px 22px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.68;
    }

    /* Contact & Form Section */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .info-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .info-icon-badge {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: var(--bg-alt);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      flex-shrink: 0;
      border: 1px solid rgba(8, 145, 178, 0.2);
    }

    .qr-card-box {
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 16px;
      text-align: center;
      max-width: 220px;
      margin-top: 10px;
    }

    .qr-card-box img {
      width: 140px;
      height: 140px;
      margin: 0 auto 10px auto;
      border-radius: 8px;
      background: #ffffff;
      padding: 6px;
    }

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

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

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.15);
    }

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

    /* Footer Styles */
    .site-footer {
      background-color: #0f242c;
      color: #9ab4bd;
      padding: 56px 0 24px 0;
      border-top: 1px solid #1c3c47;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
    }

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

    .footer-links a {
      color: #9ab4bd;
      font-size: 0.9rem;
    }

    .footer-links a:hover {
      color: #38bdf8;
      padding-left: 4px;
    }

    .footer-articles-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-articles-list a {
      color: #cbd5e1;
      font-size: 0.85rem;
      line-height: 1.5;
    }

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

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-wrap a {
      color: #94a3b8;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.82rem;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .friend-links-wrap a:hover {
      color: #38bdf8;
      background: rgba(255, 255, 255, 0.1);
      border-color: #38bdf8;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid #1c3c47;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* Floating Widget */
    .float-service-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      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);
    }

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

    /* Responsive Queries */
    @media (max-width: 1024px) {
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .scenario-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-gallery-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .site-header {
        position: relative;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 12px;
      }
      .hero-title {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .grid-3, .grid-4, .scenario-grid, .reviews-grid, .hero-metrics-grid, .process-timeline {
        grid-template-columns: 1fr;
      }
      .contact-layout {
        grid-template-columns: 1fr;
        padding: 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .case-sub-grid {
        grid-template-columns: 1fr;
      }
    }