/* CSS RESET & VARIABLES - Bold Contrast Style (撞色艳色风) */
    :root {
      --primary-color: #4F46E5;       /* Electric Indigo */
      --primary-hover: #4338CA;
      --accent-color: #06B6D4;        /* Electric Cyan */
      --highlight-color: #F59E0B;     /* Vivid Gold Accent */
      --contrast-pink: #EC4899;       /* Vibrant Pink Accent */
      --dark-text: #0F172A;           /* Deep Charcoal Body Text */
      --muted-text: #475569;          /* Subdued Gray Text */
      --bg-base: #F8FAFC;             /* Light Slate Base */
      --bg-white: #FFFFFF;
      --bg-card: #FFFFFF;
      --bg-alt: #F1F5F9;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(79, 70, 229, 0.15);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-max: 1240px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
      background-color: var(--bg-base);
      color: var(--dark-text);
      line-height: 1.6;
    }

    body {
      background-color: var(--bg-base);
      color: var(--dark-text);
      overflow-x: hidden;
    }

    /* GLOBAL CONTAINER & TYPOGRAPHY */
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    h1, h2, h3, h4 {
      color: var(--dark-text);
      font-weight: 800;
      line-height: 1.3;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

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

    /* BUTTONS & BADGES */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 30px;
      cursor: pointer;
      border: 2px solid transparent;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.25);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), #6366F1);
      color: #FFFFFF !important;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(79, 70, 229, 0.4);
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--accent-color), #0891B2);
      color: #FFFFFF !important;
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(6, 182, 212, 0.4);
    }

    .btn-highlight {
      background: linear-gradient(135deg, var(--highlight-color), #D97706);
      color: #FFFFFF !important;
    }

    .btn-highlight:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(245, 158, 11, 0.4);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--primary-color);
      color: var(--primary-color) !important;
    }

    .btn-outline:hover {
      background: var(--primary-color);
      color: #FFFFFF !important;
      transform: translateY(-2px);
    }

    .badge {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .badge-vibrant {
      background: #EEF2FF;
      color: var(--primary-color);
      border: 1px solid #C7D2FE;
    }

    .badge-cyan {
      background: #ECFEFF;
      color: #0891B2;
      border: 1px solid #A5F3FC;
    }

    .badge-pink {
      background: #FCE7F3;
      color: #DB2777;
      border: 1px solid #FBCFE8;
    }

    /* HEADER & NAVIGATION */
    .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: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

    .brand-title {
      font-size: 20px;
      font-weight: 900;
      background: linear-gradient(135deg, var(--primary-color), var(--contrast-pink));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* Strictly set gap: 0 as instructed */
      list-style: none;
    }

    .nav-links li a {
      padding: 10px 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark-text);
      display: block;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background: rgba(79, 70, 229, 0.05);
    }

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--dark-text);
      padding: 5px;
    }

    /* SECTION LAYOUT */
    .section-padding {
      padding: 80px 0;
    }

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

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

    .section-header .section-tag {
      display: inline-block;
      margin-bottom: 12px;
    }

    .section-header h2 {
      font-size: 32px;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-header p {
      color: var(--muted-text);
      font-size: 16px;
    }

    /* 1. HERO SECTION (NO IMAGES AT ALL) */
    .hero-section {
      padding: 90px 0 80px 0;
      background: linear-gradient(135deg, #EEF2FF 0%, #F8FAFC 50%, #ECFEFF 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-badge-wrap {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-content h1 {
      font-size: 44px;
      font-weight: 900;
      margin-bottom: 20px;
      color: var(--dark-text);
      letter-spacing: -1px;
    }

    .hero-content h1 span {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--muted-text);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
      padding-top: 30px;
      border-top: 1px solid rgba(226, 232, 240, 0.8);
    }

    .metric-item {
      background: #FFFFFF;
      padding: 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      text-align: center;
      transition: transform 0.3s ease;
    }

    .metric-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .metric-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-color);
    }

    .metric-label {
      font-size: 13px;
      color: var(--muted-text);
      margin-top: 4px;
      font-weight: 600;
    }

    /* 2. ABOUT & PLATFORM INTRO */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-card-box {
      background: #FFFFFF;
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .about-list {
      list-style: none;
      margin-top: 20px;
    }

    .about-list li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 14px;
      color: var(--dark-text);
      font-size: 15px;
      font-weight: 500;
    }

    .about-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      color: var(--accent-color);
      font-weight: 900;
      font-size: 16px;
    }

    /* 3. AIGC SERVICES & SCENARIOS */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

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

    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: #EEF2FF;
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 900;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 18px;
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--muted-text);
      line-height: 1.6;
    }

    /* 4. MODEL TAG CLOUD */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      color: var(--dark-text);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      transform: scale(1.05);
    }

    /* 5. PROCESS & STEPS */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #FFFFFF;
      padding: 30px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-number {
      width: 40px;
      height: 40px;
      background: var(--primary-color);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      margin: 0 auto 16px auto;
    }

    /* 6. COMPARISON TABLE & REVIEWS (五星 9.9分) */
    .comparison-wrapper {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      overflow: hidden;
    }

    .comp-header {
      background: linear-gradient(135deg, var(--primary-color), #3730A3);
      color: #FFFFFF;
      padding: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .comp-score-box {
      background: rgba(255, 255, 255, 0.15);
      padding: 16px 28px;
      border-radius: var(--radius-md);
      backdrop-filter: blur(5px);
      text-align: center;
    }

    .score-val {
      font-size: 36px;
      font-weight: 900;
      color: #FDE047;
      line-height: 1;
    }

    .stars {
      color: #FDE047;
      font-size: 20px;
      margin-top: 4px;
    }

    .table-responsive {
      overflow-x: auto;
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .comp-table th, .comp-table td {
      padding: 16px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .comp-table th {
      background: var(--bg-alt);
      font-weight: 800;
      color: var(--dark-text);
    }

    .comp-table tr:hover {
      background: #F8FAFC;
    }

    .highlight-col {
      background: #EEF2FF;
      font-weight: 700;
      color: var(--primary-color);
    }

    /* 7. TOKEN PRICING TABLE */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .price-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 30px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .price-card.featured {
      border: 2px solid var(--primary-color);
      box-shadow: var(--shadow-md);
    }

    .price-val {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-color);
      margin: 16px 0;
    }

    /* 8. CASE STUDIES & PORTFOLIO */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

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

    .case-img-box {
      width: 100%;
      max-height: 260px;
      overflow: hidden;
      background: var(--bg-alt);
    }

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

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

    .case-content {
      padding: 24px;
    }

    /* 9. CUSTOMER REVIEWS (6 REVIEWS) */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
    }

    .review-name {
      font-weight: 800;
      font-size: 15px;
    }

    .review-role {
      font-size: 12px;
      color: var(--muted-text);
    }

    /* 10. FAQ ACCORDION (12 ITEMS) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

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

    .faq-title {
      padding: 18px 24px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      transition: background 0.2s;
    }

    .faq-title:hover {
      background: #F8FAFC;
    }

    .faq-answer {
      padding: 0 24px 20px 24px;
      color: var(--muted-text);
      font-size: 14px;
      display: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .faq-icon {
      transition: transform 0.3s;
      font-weight: 900;
    }

    /* 11. ARTICLES & ENCYCLOPEDIA */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .article-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .article-card h4 {
      font-size: 16px;
      margin-bottom: 10px;
    }

    /* 12. CONTACT & FORM */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #FFFFFF;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .contact-info-list {
      list-style: none;
      margin-top: 20px;
    }

    .contact-info-list li {
      margin-bottom: 16px;
      font-size: 15px;
    }

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

    .form-group label {
      display: block;
      margin-bottom: 6px;
      font-weight: 700;
      font-size: 14px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: border 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary-color);
    }

    /* 13. FOOTER & FRIENDLY LINKS */
    .footer {
      background: #0F172A;
      color: #94A3B8;
      padding: 60px 0 30px 0;
      font-size: 14px;
    }

    .footer a {
      color: #CBD5E1;
    }

    .footer a:hover {
      color: #FFFFFF;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      margin-bottom: 20px;
    }

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

    .friendly-links-wrap a {
      background: #1E293B;
      padding: 6px 12px;
      border-radius: 4px;
      font-size: 12px;
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }

    /* FLOATING CUSTOMER SERVICE */
    .float-cs {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-cs-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      font-size: 20px;
    }

    /* RESPONSIVE MEDIA QUERIES */
    @media (max-width: 992px) {
      .hero-content h1 { font-size: 32px; }
      .services-grid, .pricing-grid, .reviews-grid, .articles-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics, .process-steps { grid-template-columns: repeat(2, 1fr); }
      .about-grid, .contact-wrapper, .cases-grid, .footer-grid { grid-template-columns: 1fr; }
      
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }

      .nav-links.active {
        display: flex;
      }

      .mobile-menu-btn {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .services-grid, .pricing-grid, .reviews-grid, .articles-grid, .hero-metrics, .process-steps {
        grid-template-columns: 1fr;
      }
      .hero-content h1 { font-size: 26px; }
      .btn { width: 100%; }
    }