/* CSS Reset & Variables */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    :root {
      --primary: #0d9488;
      --primary-dark: #0f766e;
      --primary-deep: #115e59;
      --primary-light: #14b8a6;
      --accent-cyan: #06b6d4;
      --accent-sky: #0284c7;
      --bg-light: #f8fafc;
      --bg-surface: #ffffff;
      --bg-tint: #f0fdfa;
      --text-main: #0f172a;
      --text-body: #334155;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --border-cyan: #ccfbf1;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 20px -2px rgba(13, 148, 136, 0.08);
      --shadow-lg: 0 10px 30px -4px rgba(15, 23, 42, 0.1);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    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-light);
      color: var(--text-body);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* Typography & Links */
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
    }

    /* Container */
    .container {
      width: 100%;
      max-width: 1240px;
      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, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-cyan);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: var(--bg-tint);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      padding: 9px 20px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 100%);
      color: #ffffff !important;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-md);
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
    }
    .btn-nav-primary:hover {
      opacity: 0.92;
      transform: translateY(-1px);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* Common Section Styles */
    .section-padding {
      padding: 80px 0;
      position: relative;
    }
    .bg-white {
      background-color: var(--bg-surface);
    }
    .bg-tint {
      background: linear-gradient(180deg, var(--bg-tint) 0%, var(--bg-light) 100%);
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(13, 148, 136, 0.1);
      color: var(--primary-dark);
      border: 1px solid rgba(13, 148, 136, 0.2);
      font-size: 13px;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 32px;
      margin-bottom: 14px;
      color: var(--text-main);
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(circle at 50% 10%, #ccfbf1 0%, #f0fdfa 45%, #f8fafc 100%);
      border-bottom: 1px solid var(--border-cyan);
      position: relative;
      overflow: hidden;
    }
    .hero-wrapper {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #99f6e4;
      border-radius: 999px;
      color: var(--primary-deep);
      font-size: 14px;
      font-weight: 600;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }
    .hero-badge-pulse {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      animation: pulseGlow 1.8s infinite;
    }
    @keyframes pulseGlow {
      0% { transform: scale(0.9); opacity: 0.7; }
      50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 10px var(--primary); }
      100% { transform: scale(0.9); opacity: 0.7; }
    }
    .hero-title {
      font-size: 44px;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-lead {
      font-size: 18px;
      color: var(--text-body);
      max-width: 760px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 48px;
    }
    .btn-main-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary) 0%, #0891b2 100%);
      border-radius: var(--radius-md);
      box-shadow: 0 8px 24px rgba(13, 148, 136, 0.3);
      transition: var(--transition);
    }
    .btn-main-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(13, 148, 136, 0.4);
      color: #ffffff;
    }
    .btn-secondary-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 30px;
      font-size: 16px;
      font-weight: 600;
      color: var(--primary-deep);
      background: #ffffff;
      border: 1px solid #99f6e4;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary-action:hover {
      background: var(--bg-tint);
      border-color: var(--primary);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }
    .hero-stat-card {
      background: #ffffff;
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-lg);
      padding: 20px 16px;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .stat-number {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary-dark);
      display: block;
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Model Tags Stream */
    .model-tags-container {
      margin-top: 40px;
      padding: 16px 20px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px dashed #99f6e4;
      border-radius: var(--radius-md);
    }
    .model-tags-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 10px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .model-chip {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      color: #334155;
    }
    .model-chip.highlight {
      border-color: #5eead4;
      background: #f0fdfa;
      color: var(--primary-dark);
    }

    /* Grid Layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    /* Cards */
    .tech-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .tech-card:hover {
      border-color: #5eead4;
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .tech-card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: linear-gradient(135deg, #ccfbf1 0%, #e0f2fe 100%);
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 18px;
    }
    .tech-card-title {
      font-size: 18px;
      margin-bottom: 10px;
    }
    .tech-card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .tech-card-badge {
      display: inline-block;
      margin-top: 14px;
      font-size: 12px;
      color: var(--primary-dark);
      font-weight: 600;
    }

    /* Workflow & Matrices */
    .workflow-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: var(--transition);
    }
    .workflow-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .wf-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      background: #ecfeff;
      color: #0891b2;
      display: inline-block;
      margin-bottom: 8px;
    }
    .wf-title {
      font-size: 16px;
      margin-bottom: 6px;
    }
    .wf-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Comparison Table Section */
    .eval-highlight-box {
      background: linear-gradient(135deg, #0f766e 0%, #0d9488 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 30px;
    }
    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .eval-score-num {
      font-size: 54px;
      font-weight: 900;
      line-height: 1;
      color: #fef08a;
    }
    .eval-stars {
      color: #facc15;
      font-size: 22px;
      letter-spacing: 2px;
      margin-bottom: 4px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }
    .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 var(--border-color);
      font-size: 14px;
    }
    .custom-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .custom-table th.col-highlight {
      background: #f0fdfa;
      color: var(--primary-deep);
      border-left: 2px solid var(--primary);
      border-right: 2px solid var(--primary);
    }
    .custom-table td.col-highlight {
      background: #f0fdfa;
      font-weight: 600;
      color: var(--primary-deep);
      border-left: 2px solid var(--primary);
      border-right: 2px solid var(--primary);
    }
    .tag-win {
      display: inline-block;
      padding: 2px 8px;
      background: #dcfce7;
      color: #15803d;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 700;
    }

    /* Showcase & Images */
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #5eead4;
    }
    .case-image-box {
      width: 100%;
      aspect-ratio: 16/9;
      background: #f1f5f9;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .case-image-box.square {
      aspect-ratio: 1/1;
    }
    .case-image-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .case-card:hover .case-image-box img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 20px;
      flex-grow: 1;
    }
    .case-title {
      font-size: 16px;
      margin-bottom: 8px;
    }
    .case-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Process Steps */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px 20px;
      position: relative;
    }
    .step-num {
      position: absolute;
      top: 16px;
      right: 16px;
      font-size: 28px;
      font-weight: 900;
      color: #ccfbf1;
    }
    .step-title {
      font-size: 17px;
      margin-bottom: 8px;
      color: var(--primary-deep);
    }
    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Reviews Section */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #eab308;
      font-size: 14px;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #ccfbf1;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }
    .author-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-title {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ Section */
    .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-md);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: #5eead4;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      font-size: 15px;
      color: var(--text-main);
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 18px;
      transition: transform 0.25s ease;
      color: var(--primary);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 22px;
      background: #fafafa;
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      padding: 16px 22px 20px;
      border-top: 1px solid #f1f5f9;
      transition: max-height 0.3s ease-in-out;
    }
    .faq-answer p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Form & Contact Section */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.3fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-xl);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info-panel {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .qr-card {
      background: #f0fdfa;
      border: 1px dashed #99f6e4;
      border-radius: var(--radius-lg);
      padding: 20px;
      text-align: center;
      max-width: 260px;
    }
    .qr-card img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      display: block;
      margin: 0 auto 12px;
      border: 1px solid #e2e8f0;
    }
    .qr-label {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-deep);
    }
    .info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .info-list-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
    }
    .info-icon {
      width: 32px;
      height: 32px;
      background: #e0f2fe;
      color: #0284c7;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }
    .custom-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 14px;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }
    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }
    .btn-submit {
      padding: 14px 28px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 100%);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-md);
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(13, 148, 136, 0.3);
      transition: var(--transition);
    }
    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    /* Articles Section */
    .article-meta-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }
    .article-pill {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 13px;
      color: var(--text-body);
    }
    .article-pill:hover {
      border-color: var(--primary);
      color: var(--primary-dark);
      background: var(--bg-tint);
    }

    /* Footer */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #f8fafc;
      font-size: 18px;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
    }
    .footer-col h5 {
      color: #f8fafc;
      font-size: 15px;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      font-size: 13px;
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #2dd4bf;
    }
    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .friend-links-title {
      font-size: 13px;
      color: #cbd5e1;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friend-links-list a {
      font-size: 12px;
      color: #94a3b8;
    }
    .friend-links-list a:hover {
      color: #5eead4;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 12px;
      color: #64748b;
    }

    /* Floating Widget */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid #99f6e4;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-deep);
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      transition: var(--transition);
      font-size: 18px;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .step-list { grid-template-columns: repeat(2, 1fr); }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { 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: 1px solid var(--border-color);
        padding: 16px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active li { width: 100%; }
      .nav-links.active li a { padding: 10px 14px; }
    }
    @media (max-width: 640px) {
      .hero-title { font-size: 28px; }
      .section-title { font-size: 24px; }
      .grid-2, .grid-3, .grid-4, .step-list, .hero-stats-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-row { grid-template-columns: 1fr; }
      .eval-highlight-box { flex-direction: column; text-align: center; }
      .eval-score-wrap { flex-direction: column; }
    }