:root {
      --primary: #2528dc;
      --primary-hover: #191cb3;
      --accent-coral: #ff3366;
      --accent-cyan: #00bcd4;
      --accent-amber: #ff9800;
      --accent-lime: #10b981;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-subtle: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-strong: #0f172a;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      --shadow-contrast: 4px 4px 0px #0f172a;
      --shadow-contrast-hover: 6px 6px 0px #2528dc;
      --max-width: 1200px;
    }

    * {
      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", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

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

    /* Top Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-strong);
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-badge {
      background: var(--accent-coral);
      color: #ffffff;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
      text-transform: uppercase;
    }

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

    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.92rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
      border: 2px solid var(--border-strong);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 3px 3px 0 var(--border-strong);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translate(-1px, -1px);
      box-shadow: 5px 5px 0 var(--border-strong);
    }

    .btn-accent {
      background-color: var(--accent-coral);
      color: #ffffff;
      box-shadow: 3px 3px 0 var(--border-strong);
    }

    .btn-accent:hover {
      background-color: #e02454;
      transform: translate(-1px, -1px);
      box-shadow: 5px 5px 0 var(--border-strong);
    }

    .btn-outline {
      background-color: #ffffff;
      color: var(--text-main);
      box-shadow: 3px 3px 0 var(--border-strong);
    }

    .btn-outline:hover {
      background-color: var(--bg-subtle);
      transform: translate(-1px, -1px);
      box-shadow: 5px 5px 0 var(--border-strong);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-sm);
      padding: 6px 10px;
      font-size: 1.2rem;
      cursor: pointer;
    }

    /* Section Global */
    section {
      padding: 70px 0;
      position: relative;
    }

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

    .section-tag {
      display: inline-block;
      background: #e0e7ff;
      color: var(--primary);
      border: 1.5px solid var(--border-strong);
      font-size: 0.8rem;
      font-weight: 800;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0 var(--border-strong);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

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

    /* Hero Section (No images) */
    .hero-section {
      background: linear-gradient(135deg, #eef2ff 0%, #ffffff 50%, #fff1f2 100%);
      border-bottom: 2px solid var(--border-strong);
      padding: 80px 0 70px 0;
      position: relative;
    }

    .hero-wrapper {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-content h1 span {
      background: linear-gradient(90deg, var(--primary) 0%, var(--accent-coral) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 35px;
    }

    .hero-highlights {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    .hero-highlights span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #ffffff;
      padding: 6px 12px;
      border: 1.5px solid var(--border-strong);
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0 rgba(0,0,0,0.06);
    }

    .hero-card-panel {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: 8px 8px 0 var(--border-strong);
    }

    .panel-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 2px dashed var(--border-color);
      padding-bottom: 16px;
      margin-bottom: 20px;
    }

    .panel-status {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 0.85rem;
      color: var(--accent-lime);
    }

    .status-dot {
      width: 10px;
      height: 10px;
      background: var(--accent-lime);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .panel-metrics {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 24px;
    }

    .metric-box {
      background: var(--bg-subtle);
      border: 1.5px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 16px;
      text-align: center;
    }

    .metric-value {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    .model-ticker {
      background: #f8fafc;
      border: 1.5px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 14px;
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .ticker-title {
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
      display: block;
    }

    /* Cards Grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
      gap: 24px;
    }

    .card {
      background: var(--bg-card);
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-contrast);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translate(-3px, -3px);
      box-shadow: var(--shadow-contrast-hover);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #eef2ff;
      border: 1.5px solid var(--border-strong);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    .card-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 14px;
    }

    .chip {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      color: var(--text-muted);
    }

    /* Comparison Table / Evaluation */
    .eval-highlight {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-contrast);
      margin-bottom: 40px;
    }

    .eval-score-bar {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      background: #eff6ff;
      border: 2px solid var(--primary);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      margin-bottom: 28px;
    }

    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-num {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .score-max {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--text-muted);
    }

    .star-rating {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      background: #ffffff;
    }

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

    th, td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
    }

    th {
      background: var(--bg-subtle);
      color: var(--text-main);
      font-weight: 800;
      border-bottom: 2px solid var(--border-strong);
    }

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

    .th-highlight, .td-highlight {
      background: #eef2ff;
      font-weight: 700;
      color: var(--primary);
    }

    /* Process Flow */
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

    .step-item {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0 var(--border-strong);
      position: relative;
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--accent-coral);
      margin-bottom: 8px;
      line-height: 1;
    }

    /* Case Media Showcase */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .media-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-contrast);
      display: flex;
      flex-direction: column;
    }

    .media-img-wrapper {
      width: 100%;
      background: var(--bg-subtle);
      overflow: hidden;
      border-bottom: 2px solid var(--border-strong);
    }

    .media-img-wrapper img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .media-content {
      padding: 18px;
      flex-grow: 1;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      box-shadow: 3px 3px 0 var(--border-strong);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 800;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: var(--bg-subtle);
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 700;
      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, padding 0.3s ease;
      background: #f8fafc;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.65;
      padding: 0 24px;
      border-top: 0 solid var(--border-color);
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px 24px;
      border-top: 1px solid var(--border-color);
    }

    /* Reviews Section */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-contrast);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .avatar-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      border: 1.5px solid var(--border-strong);
    }

    .user-info h4 {
      font-size: 0.95rem;
      font-weight: 800;
      color: var(--text-main);
    }

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

    /* Form & Contact */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
    }

    .form-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 6px 6px 0 var(--border-strong);
    }

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

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 800;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.92rem;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-sm);
      background: var(--bg-main);
      color: var(--text-main);
      font-family: inherit;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-control:focus {
      background: #ffffff;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 40, 220, 0.15);
    }

    .info-card {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 6px 6px 0 var(--border-strong);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 24px;
    }

    .contact-item {
      font-size: 0.92rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-item strong {
      color: var(--text-main);
      min-width: 80px;
    }

    .qr-container {
      background: var(--bg-subtle);
      border: 1.5px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 16px;
      text-align: center;
    }

    .qr-container img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      margin-bottom: 8px;
    }

    /* Article List Area */
    .article-links-box {
      background: #ffffff;
      border: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0 var(--border-strong);
      margin-top: 24px;
    }

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

    .article-urls a {
      background: var(--bg-subtle);
      border: 1px solid var(--border-strong);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
    }

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

    /* Footer */
    .site-footer {
      background-color: #ffffff;
      border-top: 2px solid var(--border-strong);
      padding: 50px 0 30px 0;
      margin-top: auto;
    }

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

    .footer-title {
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .friendly-links a {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
      background: var(--bg-subtle);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .friendly-links a:hover {
      color: var(--primary);
      border-color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: var(--text-light);
      gap: 14px;
    }

    /* Floating Widget */
    .floating-widget {
      position: fixed;
      right: 24px;
      bottom: 24px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 2px solid var(--border-strong);
      box-shadow: 3px 3px 0 var(--border-strong);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .float-btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 5px 5px 0 var(--border-strong);
    }

    .float-kefu {
      background: var(--accent-coral);
      color: #ffffff;
    }

    /* Responsive */
    @media (max-width: 992px) {
      .hero-wrapper, .contact-wrapper, .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--border-strong);
        padding: 16px 20px;
        gap: 0;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.active li {
        width: 100%;
      }
      .nav-links.active li a {
        width: 100%;
        padding: 10px 14px;
      }
    }

    @media (max-width: 640px) {
      .section-title {
        font-size: 1.7rem;
      }
      .hero-content h1 {
        font-size: 1.9rem;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .panel-metrics {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
      }
      .hero-actions .btn {
        width: 100%;
      }
    }