/* CSS RESET & VARIABLES - 亮橙炽艳风 */
    :root {
      --primary-color: #ff5500;
      --primary-hover: #e04b00;
      --primary-light: #fff2eb;
      --accent-color: #ff9900;
      --dark-color: #1e2025;
      --text-main: #2b2d33;
      --text-muted: #666c77;
      --bg-base: #fcfcfd;
      --bg-card: #ffffff;
      --bg-alt: #f6f7f9;
      --border-color: #eeeef1;
      --shadow-sm: 0 2px 8px rgba(255, 85, 0, 0.06);
      --shadow-md: 0 8px 24px rgba(30, 32, 37, 0.08);
      --shadow-lg: 0 16px 32px rgba(255, 85, 0, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --max-width: 1200px;
      --transition: all 0.3s 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, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    a:hover {
      color: var(--primary-hover);
    }

    ul {
      list-style: none;
    }

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    .section-title {
      text-align: center;
      margin-bottom: 40px;
    }

    .section-title h2 {
      font-size: 2.2rem;
      color: var(--dark-color);
      margin-bottom: 12px;
      font-weight: 700;
    }

    .section-title p {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto;
    }

    .badge-tag {
      display: inline-block;
      padding: 4px 12px;
      background: var(--primary-light);
      color: var(--primary-color);
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* HEADER & NAV */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      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: 70px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      padding: 8px 12px;
      color: var(--text-main);
      font-weight: 500;
      font-size: 0.95rem;
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-weight: 600;
      border-radius: 50px;
      cursor: pointer;
      transition: var(--transition);
      border: none;
      font-size: 0.95rem;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(255, 85, 0, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 85, 0, 0.4);
    }

    .btn-outline {
      border: 1px solid var(--primary-color);
      color: var(--primary-color);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary-light);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--dark-color);
      cursor: pointer;
    }

    /* HERO SECTION (NO IMAGES) */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 80% 20%, rgba(255, 153, 0, 0.1) 0%, rgba(255, 85, 0, 0.03) 50%, rgba(255,255,255,0) 100%);
      text-align: center;
      position: relative;
    }

    .hero-content {
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-title {
      font-size: 2.8rem;
      line-height: 1.25;
      color: var(--dark-color);
      font-weight: 800;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 35px;
      line-height: 1.6;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
    }

    .hero-features-strip {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .hero-feat-card {
      background: var(--bg-card);
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: left;
    }

    .hero-feat-card h4 {
      color: var(--dark-color);
      font-size: 1.1rem;
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .hero-feat-card h4::before {
      content: "✓";
      color: var(--primary-color);
      font-weight: bold;
    }

    .hero-feat-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* DATA METRICS */
    .metrics-section {
      padding: 40px 0;
      background: var(--dark-color);
      color: #ffffff;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }

    .metric-item h3 {
      font-size: 2.5rem;
      color: var(--accent-color);
      margin-bottom: 4px;
      font-weight: 700;
    }

    .metric-item p {
      color: #a0a5b1;
      font-size: 0.95rem;
    }

    /* GENERAL SECTIONS */
    .section-padding {
      padding: 80px 0;
    }

    .bg-alt {
      background-color: var(--bg-alt);
    }

    /* SERVICE CARDS */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 0;
      background: var(--primary-color);
      transition: var(--transition);
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }

    .service-card:hover::before {
      height: 100%;
    }

    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary-color);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: bold;
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.2rem;
      color: var(--dark-color);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* PLATFORM AGGREGATION & TAG CLOUD */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 50px;
      font-size: 0.9rem;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }

    /* PROCESS STEPS */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .process-step {
      background: var(--bg-card);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 40px;
      height: 40px;
      background: var(--primary-color);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
    }

    /* COMPARISON TABLE & EVALUATION */
    .eval-box {
      background: linear-gradient(135deg, #fff5f0 0%, #fff 100%);
      border: 2px solid var(--primary-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-score {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1;
    }

    .stars {
      color: #ff9900;
      font-size: 1.5rem;
    }

    .table-wrapper {
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

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

    .compare-table tr:hover {
      background: rgba(255, 85, 0, 0.02);
    }

    .highlight-col {
      background: rgba(255, 85, 0, 0.04);
      font-weight: 600;
      color: var(--primary-color);
    }

    /* CASE STUDIES & MEDIA INTEGRATION */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 30px;
    }

    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .case-img {
      height: 200px;
      overflow: hidden;
      background: var(--bg-alt);
    }

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

    .case-card:hover .case-img img {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px;
    }

    .case-body h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* TOKEN COMPARISON */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .token-card {
      background: var(--bg-card);
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
    }

    .token-price {
      font-size: 1.8rem;
      color: var(--primary-color);
      font-weight: 700;
      margin: 12px 0;
    }

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

    .comment-card {
      background: var(--bg-card);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .user-info h4 {
      font-size: 1rem;
      color: var(--dark-color);
    }

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

    /* FAQ ACCORDION */
    .faq-container {
      max-width: 850px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--dark-color);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      color: var(--primary-color);
      transition: var(--transition);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--bg-alt);
    }

    .faq-answer-content {
      padding: 18px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-color);
    }

    /* ARTICLES LIST */
    .articles-wrapper {
      background: var(--bg-card);
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-btn {
      display: inline-block;
      padding: 8px 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-sm);
      color: var(--text-main);
      font-size: 0.9rem;
    }

    .article-link-btn:hover {
      background: var(--primary-light);
      color: var(--primary-color);
    }

    /* FORM SECTION */
    .form-container {
      max-width: 700px;
      margin: 0 auto;
      background: var(--bg-card);
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      color: var(--dark-color);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(255, 85, 0, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 120px;
    }

    /* FOOTER */
    .site-footer {
      background: var(--dark-color);
      color: #a0a5b1;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col a {
      color: #a0a5b1;
    }

    .footer-col a:hover {
      color: #ffffff;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friend-links a {
      color: #a0a5b1;
      font-size: 0.85rem;
      background: rgba(255,255,255,0.05);
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friend-links a:hover {
      color: var(--accent-color);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      text-align: center;
    }

    /* FLOATING WIDGET */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      text-align: center;
      width: 140px;
    }

    .floating-kefu img {
      width: 100%;
      border-radius: var(--radius-sm);
      margin-bottom: 6px;
    }

    .floating-kefu span {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--dark-color);
    }

    /* RESPONSIVE STYLES */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-card);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .header-actions {
        display: none;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-btns {
        flex-direction: column;
      }
      .floating-kefu {
        display: none;
      }
    }