:root {
      --primary: #f59e0b;
      --primary-hover: #d97706;
      --primary-light: #fef3c7;
      --primary-glow: #fbbf24;
      --dark-text: #1f2937;
      --mid-text: #4b5563;
      --light-text: #6b7280;
      --bg-main: #faf9f6;
      --bg-card: #ffffff;
      --border-color: #f3f4f6;
      --border-accent: #fde68a;
      --shadow-sm: 0 2px 8px rgba(245, 158, 11, 0.08);
      --shadow-md: 0 8px 24px rgba(245, 158, 11, 0.12);
      --radius: 12px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    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(--dark-text);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* Header */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--primary-light);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }
    .nav-inner {
      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;
    }
    .brand-title {
      font-size: 18px;
      font-weight: 700;
      color: #b45309;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--mid-text);
      transition: color 0.2s ease;
    }
    .nav-links li a:hover {
      color: var(--primary-hover);
    }
    .nav-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      background: var(--primary);
      color: #ffffff;
      padding: 8px 18px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 600;
      transition: all 0.2s ease;
      box-shadow: 0 2px 6px rgba(245, 158, 11, 0.3);
    }
    .btn-nav-primary:hover {
      background: var(--primary-hover);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-accent);
      padding: 6px 10px;
      border-radius: 4px;
      cursor: pointer;
      font-size: 16px;
    }
    /* Hero - No images strictly */
    .hero-section {
      background: radial-gradient(circle at 50% 30%, #fffbeb 0%, #faf9f6 70%);
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
      border-bottom: 1px solid var(--border-accent);
    }
    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: #fef3c7;
      color: #92400e;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid #fde68a;
    }
    .hero-title {
      font-size: 38px;
      font-weight: 800;
      color: #111827;
      margin-bottom: 20px;
      line-height: 1.3;
    }
    .hero-title span {
      color: var(--primary-hover);
      border-bottom: 4px solid var(--primary-glow);
    }
    .hero-desc {
      font-size: 16px;
      color: var(--mid-text);
      max-width: 800px;
      margin: 0 auto 32px;
      line-height: 1.8;
    }
    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-hero-main {
      background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
      color: #ffffff;
      padding: 14px 32px;
      border-radius: 8px;
      font-size: 16px;
      font-weight: 700;
      box-shadow: 0 4px 14px rgba(217, 119, 6, 0.35);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(217, 119, 6, 0.45);
    }
    .btn-hero-secondary {
      background: #ffffff;
      color: #92400e;
      border: 2px solid var(--primary);
      padding: 12px 28px;
      border-radius: 8px;
      font-size: 16px;
      font-weight: 600;
      transition: background 0.2s ease;
    }
    .btn-hero-secondary:hover {
      background: var(--primary-light);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .hero-stat-card {
      background: #ffffff;
      border: 1px solid var(--border-accent);
      padding: 20px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 26px;
      font-weight: 800;
      color: #b45309;
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 13px;
      color: var(--light-text);
    }
    /* Section General */
    section {
      padding: 70px 0;
      border-bottom: 1px solid #f0f0f0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-tag {
      font-size: 12px;
      font-weight: 700;
      color: #b45309;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 12px;
    }
    .section-sub {
      font-size: 15px;
      color: var(--light-text);
      max-width: 650px;
      margin: 0 auto;
    }
    /* Card Grids */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-top: 3px solid var(--primary);
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-top-color: var(--primary-hover);
    }
    .feature-icon {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      color: #b45309;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      font-weight: 800;
      font-size: 18px;
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--dark-text);
    }
    .feature-card p {
      font-size: 13.5px;
      color: var(--mid-text);
      line-height: 1.6;
    }
    /* Model Cloud */
    .model-badge-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius);
      border: 1px solid var(--border-accent);
      box-shadow: var(--shadow-sm);
    }
    .model-badge {
      background: #fffbeb;
      border: 1px solid #fde68a;
      color: #92400e;
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      transition: all 0.2s ease;
    }
    .model-badge:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }
    /* Comparison Table */
    .table-container {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid #f3f4f6;
      font-size: 14px;
    }
    th {
      background: #fffbeb;
      color: #92400e;
      font-weight: 700;
    }
    tr.highlight-row {
      background: #fffdf5;
    }
    .score-tag {
      background: #fef3c7;
      color: #b45309;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
    }
    /* Workflow Steps */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 20px;
      border-radius: var(--radius);
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
    }
    .step-card h3 {
      font-size: 16px;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13px;
      color: var(--light-text);
    }
    /* Media Showcase Section */
    .media-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: center;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .media-body {
      padding: 20px;
    }
    .media-body h3 {
      font-size: 16px;
      margin-bottom: 6px;
    }
    .media-body p {
      font-size: 13px;
      color: var(--light-text);
    }
    /* FAQ Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 15px;
      font-weight: 600;
      color: var(--dark-text);
      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: #fffdf5;
    }
    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      font-size: 14px;
      color: var(--mid-text);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      padding: 0 24px 18px;
      max-height: 200px;
    }
    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--primary-hover);
      font-weight: 700;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* Testimonials */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .t-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .t-avatar {
      width: 44px;
      height: 44px;
      background: #fde68a;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #b45309;
      font-size: 15px;
    }
    .t-meta h4 {
      font-size: 15px;
      color: var(--dark-text);
    }
    .t-meta span {
      font-size: 12px;
      color: var(--light-text);
    }
    .testimonial-card p {
      font-size: 13.5px;
      color: var(--mid-text);
      line-height: 1.6;
    }
    /* Articles List */
    .article-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .article-links {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      margin-top: 16px;
    }
    .article-link-item {
      padding: 12px 16px;
      background: #fafafa;
      border: 1px solid #eeeeee;
      border-radius: 6px;
      font-size: 13.5px;
      color: var(--mid-text);
      display: block;
      transition: all 0.2s ease;
    }
    .article-link-item:hover {
      background: #fffbeb;
      border-color: var(--border-accent);
      color: #92400e;
    }
    /* Form Section */
    .form-wrapper {
      max-width: 680px;
      margin: 0 auto;
      background: #ffffff;
      border: 1px solid var(--border-accent);
      padding: 36px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 13.5px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--dark-text);
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #d1d5db;
      border-radius: 6px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .btn-submit {
      width: 100%;
      background: var(--primary);
      color: #ffffff;
      border: none;
      padding: 12px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 6px;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3);
      transition: background 0.2s ease;
    }
    .btn-submit:hover {
      background: var(--primary-hover);
    }
    /* Contact Box */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .contact-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
    }
    .contact-qr {
      text-align: center;
    }
    .contact-qr img {
      max-width: 140px;
      height: auto;
      border-radius: 8px;
      border: 1px solid var(--border-accent);
      margin-bottom: 8px;
    }
    /* Footer */
    footer {
      background: #1f2937;
      color: #f3f4f6;
      padding: 50px 0 20px;
      border-top: 4px solid var(--primary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      font-size: 18px;
      color: #fbbf24;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 13.5px;
      color: #9ca3af;
      line-height: 1.6;
    }
    .footer-links h5 {
      font-size: 15px;
      color: #ffffff;
      margin-bottom: 14px;
    }
    .footer-links ul {
      list-style: none;
    }
    .footer-links ul li {
      margin-bottom: 8px;
    }
    .footer-links ul li a {
      font-size: 13px;
      color: #9ca3af;
      transition: color 0.2s;
    }
    .footer-links ul li a:hover {
      color: #fbbf24;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }
    .friend-links a {
      font-size: 12.5px;
      color: #9ca3af;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      transition: color 0.2s;
    }
    .friend-links a:hover {
      color: #fbbf24;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid #374151;
      font-size: 12.5px;
      color: #9ca3af;
    }
    /* Floating Tool */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      background: #ffffff;
      border: 2px solid var(--primary);
      border-radius: 50px;
      padding: 8px 16px;
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      font-weight: 700;
      color: #b45309;
      cursor: pointer;
      transition: transform 0.2s ease;
    }
    .floating-kefu:hover {
      transform: scale(1.05);
    }
    /* Responsive */
    @media (max-width: 992px) {
      .grid-4, .hero-stats-grid, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .media-grid, .contact-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 0;
        border-bottom: 2px solid var(--primary-light);
      }
      .nav-links.show {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-stats-grid, .flow-steps, .grid-4 {
        grid-template-columns: 1fr;
      }
      .article-links {
        grid-template-columns: 1fr;
      }
    }