/* CSS RESET & VARIABLES - Bold Vibrant Accent Theme (撞色艳色风) */
    :root {
      --primary: #4F46E5;
      --primary-dark: #3730A3;
      --secondary: #FF2E93;
      --accent: #00F0FF;
      --warning: #FFB800;
      --bg-main: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --radius: 12px;
      --shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --container-width: 1200px;
    }

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

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

    /* Container Standard */
    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.2s ease;
    }
    a:hover {
      color: var(--secondary);
    }

    /* Typography Defaults */
    h1, h2, h3, h4 {
      color: var(--text-main);
      font-weight: 800;
      line-height: 1.25;
    }

    .section-title {
      text-align: center;
      font-size: 2.2rem;
      margin-bottom: 12px;
      background: linear-gradient(135deg, var(--text-main) 0%, var(--primary-dark) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      font-size: 1.05rem;
      margin-bottom: 45px;
    }

    /* Vibrant Badges */
    .badge {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      background: linear-gradient(90deg, #FF2E93, #FF8A00);
      color: #FFFFFF;
      margin-bottom: 12px;
    }

    /* BUTTONS */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: none;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .btn:hover {
      transform: translateY(-2px);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 15px rgba(255, 46, 147, 0.35);
    }
    .btn-secondary {
      background: #0F172A;
      color: #00F0FF;
      border: 1px solid #00F0FF;
      box-shadow: 0 4px 15px rgba(0, 240, 255, 0.2);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    /* HEADER & NAV */
    .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(--primary);
    }
    .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;
    }
    /* Strictly required Rule: gap:0 on .nav-links */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      padding: 8px 12px;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
    }
    .nav-links li a:hover {
      color: var(--secondary);
      background: rgba(79, 70, 229, 0.05);
      border-radius: 6px;
    }
    .mobile-menu-toggle {
      display: none;
      font-size: 1.5rem;
      background: none;
      border: none;
      cursor: pointer;
      color: var(--text-main);
    }

    /* HERO SECTION (Strict Rule: NO Images in Hero) */
    .hero-section {
      padding: 90px 0 70px;
      background: linear-gradient(135deg, #0F172A 0%, #1E1B4B 50%, #31103F 100%);
      color: #FFFFFF;
      position: relative;
      overflow: hidden;
    }
    .hero-section::before {
      content: '';
      position: absolute;
      top: -100px;
      right: -100px;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0,240,255,0.3) 0%, rgba(0,0,0,0) 70%);
      border-radius: 50%;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 2.8rem;
      color: #FFFFFF;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(90deg, #00F0FF, #FF2E93);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: #CBD5E1;
      margin-bottom: 35px;
    }
    .hero-cta-group {
      display: flex;
      gap: 15px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-features-bar {
      display: flex;
      justify-content: center;
      gap: 30px;
      flex-wrap: wrap;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 30px;
    }
    .hero-feat-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      color: #E2E8F0;
    }
    .hero-feat-item strong {
      color: var(--accent);
    }

    /* SECTIONS GENERAL */
    section {
      padding: 70px 0;
    }
    .bg-white {
      background-color: #FFFFFF;
    }
    .bg-light {
      background-color: #F1F5F9;
    }

    /* METRIC CARDS */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }
    .metric-card {
      background: var(--bg-card);
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 25px;
      text-align: center;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .metric-card:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow);
      transform: translateY(-4px);
    }
    .metric-card::top-line {
      height: 4px;
      background: linear-gradient(90deg, var(--accent), var(--secondary));
    }
    .metric-value {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--primary);
    }
    .metric-label {
      color: var(--text-muted);
      font-weight: 600;
      font-size: 0.95rem;
    }

    /* AIGC SERVICES GRID */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 25px;
    }
    .service-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-left: 5px solid var(--primary);
      border-radius: var(--radius);
      padding: 25px;
      box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
      transition: all 0.3s ease;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow);
      border-left-color: var(--secondary);
    }
    .service-card h3 {
      font-size: 1.25rem;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .service-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* ONE-STOP PRODUCTION SCENARIOS */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 20px;
    }
    .scenario-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px;
      transition: transform 0.2s ease;
    }
    .scenario-item:hover {
      border-color: var(--accent);
      transform: scale(1.02);
    }
    .scenario-tag {
      display: inline-block;
      padding: 2px 8px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    /* MEDIA & BANNER DISPLAY */
    .banner-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }
    .media-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow);
    }
    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* COMPARISON SECTION */
    .rating-banner {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: #FFFFFF;
      border-radius: var(--radius);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 30px;
    }
    .rating-score {
      display: flex;
      align-items: center;
      gap: 15px;
    }
    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--accent);
    }
    .stars {
      color: var(--warning);
      font-size: 1.5rem;
    }
    .table-wrapper {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .comp-table th {
      background: #F8FAFC;
      color: var(--text-main);
      font-weight: 700;
    }
    .comp-table tr:hover {
      background: #F1F5F9;
    }
    .highlight-col {
      background: rgba(79, 70, 229, 0.04);
      font-weight: 700;
      color: var(--primary);
    }

    /* TOKEN PRICE COMPARISON */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }
    .token-card {
      background: #FFFFFF;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      position: relative;
    }
    .token-card.best-value {
      border-color: var(--secondary);
    }
    .token-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--secondary);
      color: #FFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 20px;
    }

    /* MODEL TAG CLOUD */
    .model-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }
    .model-tag {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.85rem;
      color: var(--text-muted);
      transition: all 0.2s;
    }
    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.05);
    }

    /* WORKFLOW & STEPS */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      padding: 25px;
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }
    .step-number {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin: 0 auto 15px;
    }

    /* USER REVIEWS */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 25px;
    }
    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 25px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.03);
    }
    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 15px;
    }
    .avatar-placeholder {
      width: 45px;
      height: 45px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #FFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* FAQ ACCORDION */
    .faq-list {
      max-width: 900px;
      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 22px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      user-select: none;
    }
    .faq-answer {
      padding: 0 22px 18px;
      color: var(--text-muted);
      font-size: 0.95rem;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(180deg);
    }
    .faq-toggle-icon {
      transition: transform 0.3s;
      font-weight: bold;
    }

    /* ARTICLES LIST */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }
    .article-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 20px;
    }

    /* FORM & CONTACT SECTION */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .form-box {
      background: #FFFFFF;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-weight: 700;
      margin-bottom: 6px;
      font-size: 0.9rem;
    }
    .form-control {
      width: 100%;
      padding: 12px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.95rem;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
    }
    .qr-card {
      text-align: center;
      background: #FFFFFF;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }
    .qr-card img {
      max-width: 160px;
      border-radius: 8px;
    }

    /* FOOTER */
    .site-footer {
      background: #0F172A;
      color: #94A3B8;
      padding: 60px 0 20px;
      border-top: 3px solid var(--secondary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      margin-bottom: 18px;
      font-size: 1.1rem;
    }
    .footer-col p, .footer-col a {
      color: #94A3B8;
      font-size: 0.9rem;
      margin-bottom: 8px;
      display: block;
    }
    .footer-col a:hover {
      color: #00F0FF;
    }
    .friend-links-box {
      border-top: 1px solid #1E293B;
      padding-top: 20px;
      margin-bottom: 20px;
    }
    .friend-links-box a {
      display: inline-block;
      margin-right: 15px;
      margin-bottom: 8px;
      color: #CBD5E1;
      font-size: 0.85rem;
    }
    .copyright-bar {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid #1E293B;
      font-size: 0.85rem;
    }

    /* FLOATING WIDGET */
    .float-widget {
      position: fixed;
      bottom: 30px;
      right: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFF;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
    }
    .float-btn.kefu {
      background: var(--secondary);
    }

    /* RESPONSIVE MEDIA QUERIES */
    @media (max-width: 992px) {
      .contact-layout {
        grid-template-columns: 1fr;
      }
      .banner-container {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.show {
        display: flex;
      }
      .section-title {
        font-size: 1.75rem;
      }
    }