/* CSS Standard Reset & Colors (撞色艳色风 Modern Light Base with Vibrant High Contrast) */
    :root {
      --bg-body: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --color-primary: #2563eb;
      --color-primary-hover: #1d4ed8;
      --color-accent-pink: #ec4899;
      --color-accent-purple: #8b5cf6;
      --color-accent-orange: #f97316;
      --color-accent-teal: #0d9488;
      --color-yellow: #eab308;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(37, 99, 235, 0.08);
      --shadow-lg: 0 20px 30px -10px rgba(139, 92, 246, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 24px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      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-body);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      width: 100%;
    }

    /* Container System */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

    .brand-title {
      font-size: 20px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    /* Navigation constraint: nav-links gap set to 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      text-decoration: none;
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--color-primary);
      background-color: rgba(37, 99, 235, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 700;
      border-radius: var(--radius-md);
      text-decoration: none;
      cursor: pointer;
      border: 2px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--color-primary), #3b82f6);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
      background: linear-gradient(135deg, var(--color-primary-hover), #2563eb);
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--color-accent-pink), var(--color-accent-purple));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(236, 72, 153, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.45);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--color-primary);
      border-color: var(--color-primary);
    }

    .btn-outline:hover {
      background: rgba(37, 99, 235, 0.05);
      transform: translateY(-2px);
    }

    /* Mobile Hamburger */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* Section Global Styles */
    .section-padding {
      padding: 80px 0;
    }

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

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

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 700;
      color: var(--color-accent-purple);
      background: rgba(139, 92, 246, 0.1);
      border-radius: 50px;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* Hero Section (Strictly NO IMAGES allowed in Hero) */
    .hero-section {
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 15% 20%, rgba(236, 72, 153, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 85% 70%, rgba(37, 99, 235, 0.08) 0%, transparent 45%),
                  var(--bg-body);
      position: relative;
    }

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

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid rgba(139, 92, 246, 0.3);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      color: var(--color-accent-purple);
      box-shadow: 0 4px 12px rgba(139, 92, 246, 0.08);
      margin-bottom: 24px;
    }

    .hero-h1 {
      font-size: 40px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

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

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    /* Metric Cards Grid in Hero */
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .metric-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--color-primary);
    }

    .metric-val {
      font-size: 32px;
      font-weight: 900;
      color: var(--color-primary);
      margin-bottom: 4px;
      font-family: Arial, sans-serif;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* About & Platform Intro */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-box {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .about-box h3 {
      font-size: 22px;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }

    .model-tag {
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      padding: 5px 12px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }

    /* Cards Grid */
    .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-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .bg-icon-1 { background: linear-gradient(135deg, #2563eb, #3b82f6); }
    .bg-icon-2 { background: linear-gradient(135deg, #ec4899, #f43f5e); }
    .bg-icon-3 { background: linear-gradient(135deg, #8b5cf6, #a855f7); }
    .bg-icon-4 { background: linear-gradient(135deg, #0d9488, #14b8a6); }
    .bg-icon-5 { background: linear-gradient(135deg, #f97316, #fb923c); }
    .bg-icon-6 { background: linear-gradient(135deg, #6366f1, #818cf8); }

    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Workflow Steps */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--color-primary);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px auto;
      font-size: 15px;
    }

    .step-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Comparison Table Styling */
    .comparison-wrapper {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .rating-banner {
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #ffffff;
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-big {
      font-size: 44px;
      font-weight: 900;
      color: var(--color-yellow);
      line-height: 1;
    }

    .stars {
      color: var(--color-yellow);
      font-size: 20px;
      letter-spacing: 2px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .comp-table th {
      background: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }

    .comp-table tr:hover {
      background-color: rgba(37, 99, 235, 0.02);
    }

    .highlight-cell {
      background: rgba(37, 99, 235, 0.05);
      font-weight: 700;
      color: var(--color-primary);
    }

    /* Token Price Table */
    .token-table {
      width: 100%;
      border-collapse: collapse;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .token-table th, .token-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

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

    .badge-discount {
      background: #dcfce7;
      color: #15803d;
      padding: 4px 8px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 700;
    }

    /* Case Media Section */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .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-wrap {
      width: 100%;
      overflow: hidden;
      background: var(--bg-alt);
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }

    .case-body {
      padding: 20px;
    }

    .case-body h4 {
      font-size: 17px;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .case-body p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* User Reviews */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: var(--bg-card);
      padding: 26px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      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(--color-primary), var(--color-accent-purple));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 16px;
    }

    .user-info h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-info span {
      font-size: 12px;
      color: var(--text-light);
    }

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

    /* FAQ Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      transition: var(--transition);
    }

    .faq-question:hover {
      background-color: rgba(37, 99, 235, 0.03);
      color: var(--color-primary);
    }

    .faq-icon {
      font-size: 20px;
      transition: transform 0.3s ease;
      color: var(--color-primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      background-color: var(--bg-body);
    }

    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid var(--border-color);
    }

    .faq-item.active .faq-answer {
      max-height: 500px;
      transition: max-height 0.3s ease-in-out;
    }

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

    /* Contact & Form Section */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .contact-info-card {
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-card h3 {
      font-size: 24px;
      margin-bottom: 16px;
      color: #ffffff;
    }

    .contact-list {
      list-style: none;
      margin: 24px 0;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 15px;
      color: #cbd5e1;
    }

    .qr-box {
      background: #ffffff;
      padding: 14px;
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
      margin-top: 20px;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      object-fit: contain;
    }

    .qr-box span {
      display: block;
      font-size: 12px;
      color: var(--text-main);
      font-weight: 700;
      margin-top: 6px;
    }

    .form-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-family: inherit;
      color: var(--text-main);
      background-color: var(--bg-body);
      transition: var(--transition);
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--color-primary);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    /* Articles Section */
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .article-chip {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 10px 18px;
      border-radius: 30px;
      font-size: 14px;
      color: var(--color-primary);
      text-decoration: none;
      font-weight: 600;
      transition: var(--transition);
    }

    .article-chip:hover {
      background: var(--color-primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* Footer Section */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      border-top: 1fr solid #1e293b;
    }

    .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;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 14px;
      line-height: 1.6;
      margin-top: 12px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links li a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 14px;
      transition: var(--transition);
    }

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

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

    .friend-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 13px;
      transition: var(--transition);
    }

    .friend-links a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }

    .ai-page-home-link {
      color: var(--color-primary);
      text-decoration: none;
      font-weight: bold;
    }

    /* Floating Widget */
    .float-contact {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--color-primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
      text-decoration: none;
      font-size: 20px;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    .float-btn.btn-qr {
      background: var(--color-accent-pink);
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.4);
    }

    /* Mobile Responsive Rules */
    @media (max-width: 992px) {
      .hero-h1 { font-size: 32px; }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .grid-3, .case-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .steps-wrapper { grid-template-columns: repeat(3, 1fr); }
      .about-grid, .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .header-cta { display: none; }
      .mobile-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .hero-metrics { grid-template-columns: 1fr; }
      .grid-3, .grid-4, .case-grid, .reviews-grid, .steps-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-h1 { font-size: 26px; }
      .section-title { font-size: 24px; }
    }