/* Global Reset & Box Sizing */
    *, *::before, *::after {
      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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: #f4f6fa;
      color: #0f172a;
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    /* Color Palette - Light Vibrant Neon Accent Theme */
    :root {
      --primary-cyan: #00d2ff;
      --primary-purple: #7928ca;
      --neon-magenta: #ff0080;
      --neon-lime: #10b981;
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --glow-cyan: rgba(0, 210, 255, 0.25);
      --glow-purple: rgba(121, 40, 202, 0.18);
    }

    a {
      color: #2563eb;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    a:hover {
      color: #00d2ff;
    }

    /* Typography Defaults */
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-dark);
      font-weight: 700;
      line-height: 1.25;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: linear-gradient(90deg, rgba(0, 210, 255, 0.12), rgba(121, 40, 202, 0.12));
      border: 1px solid rgba(0, 210, 255, 0.3);
      border-radius: 20px;
      color: #0091ff;
      font-size: 0.85rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.2rem;
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #7928ca 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 750px;
      margin: 0 auto;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      border: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
      gap: 8px;
    }

    .btn-neon {
      background: linear-gradient(135deg, #00d2ff 0%, #0072ff 50%, #7928ca 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 20px rgba(0, 210, 255, 0.4);
    }
    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 25px rgba(0, 210, 255, 0.6);
      filter: brightness(1.08);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-dark) !important;
      border: 2px solid #00d2ff;
    }
    .btn-outline:hover {
      background: rgba(0, 210, 255, 0.08);
      transform: translateY(-2px);
    }

    /* Sticky Navigation Header */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 210, 255, 0.2);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(90deg, #0072ff, #7928ca);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* SPECIFIC REQUIREMENT: .nav-links gap must be 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* STRICT COMPLIANCE */
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: #334155;
      position: relative;
    }

    .nav-links li a:hover, .nav-links li a.active {
      color: #0072ff;
    }

    .nav-links li a::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 12px;
      right: 12px;
      height: 2px;
      background: linear-gradient(90deg, #00d2ff, #ff0080);
      transform: scaleX(0);
      transition: transform 0.25s ease;
    }

    .nav-links li a:hover::after {
      transform: scaleX(1);
    }

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

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* Section Spacing */
    section {
      padding: 70px 0;
      position: relative;
    }

    section:nth-child(even) {
      background-color: #ffffff;
    }

    /* HERO SECTION - NO IMAGES ALLOWED HERE */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(0, 210, 255, 0.08) 0%, rgba(121, 40, 202, 0.05) 50%, rgba(248, 250, 252, 1) 100%), #ffffff;
      padding: 90px 0 70px 0;
      text-align: center;
      border-bottom: 1px solid rgba(0, 210, 255, 0.15);
      position: relative;
      overflow: hidden;
    }

    .hero-section::before {
      content: '';
      position: absolute;
      top: -50px;
      left: 50%;
      transform: translateX(-50%);
      width: 600px;
      height: 300px;
      background: radial-gradient(ellipse, rgba(0, 210, 255, 0.2) 0%, rgba(121, 40, 202, 0.15) 40%, transparent 70%);
      filter: blur(40px);
      z-index: 0;
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 1;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid #00d2ff;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #0072ff;
      box-shadow: 0 0 15px rgba(0, 210, 255, 0.2);
      margin-bottom: 24px;
    }

    /* REWRITTEN H1 UNDER 20 CHARACTERS */
    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, #0072ff 75%, #7928ca 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 35px;
      line-height: 1.7;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .stat-card {
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(0, 210, 255, 0.25);
      border-radius: 12px;
      padding: 20px 15px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.03);
      backdrop-filter: blur(5px);
      transition: transform 0.3s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      border-color: #00d2ff;
      box-shadow: 0 12px 30px rgba(0, 210, 255, 0.2);
    }

    .stat-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: #0072ff;
      background: linear-gradient(90deg, #0072ff, #7928ca);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Generic Grid layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: center;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 25px;
    }

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

    /* Standard Card Styling with Neon Accents */
    .neon-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px;
      position: relative;
      transition: all 0.3s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .neon-card::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(90deg, #00d2ff, #7928ca, #ff0080);
      border-radius: 14px 14px 0 0;
      opacity: 0.7;
    }

    .neon-card:hover {
      transform: translateY(-5px);
      border-color: #00d2ff;
      box-shadow: 0 12px 30px rgba(0, 210, 255, 0.15);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(0, 210, 255, 0.15), rgba(121, 40, 202, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      color: #0072ff;
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 1.25rem;
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex-grow: 1;
    }

    .card-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 15px;
    }

    .card-tag {
      font-size: 0.75rem;
      padding: 3px 8px;
      background: #f1f5f9;
      color: #475569;
      border-radius: 4px;
    }

    /* Comparison Table Styling */
    .rating-header-box {
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
      border: 2px solid #00d2ff;
      border-radius: 16px;
      padding: 30px;
      text-align: center;
      box-shadow: 0 10px 30px rgba(0, 210, 255, 0.15);
      margin-bottom: 40px;
    }

    .rating-score {
      font-size: 3.5rem;
      font-weight: 900;
      color: #0072ff;
      line-height: 1;
      margin: 10px 0;
    }

    .stars {
      color: #f59e0b;
      font-size: 1.5rem;
      margin-bottom: 5px;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 12px;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
      border: 1px solid var(--border-color);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 700px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
    }

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-dark);
    }

    .comparison-table tr:hover {
      background-color: rgba(0, 210, 255, 0.03);
    }

    .check-yes {
      color: #10b981;
      font-weight: bold;
    }

    .check-no {
      color: #94a3b8;
    }

    .highlight-col {
      background: rgba(0, 210, 255, 0.05);
      font-weight: 600;
      color: #0072ff;
    }

    /* Process steps */
    .step-item {
      position: relative;
      background: #ffffff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      border-top: 4px solid #00d2ff;
    }

    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(0, 210, 255, 0.3);
      position: absolute;
      top: 15px;
      right: 20px;
    }

    /* Reviews / Testimonials */
    .testimonial-card {
      background: #ffffff;
      border-radius: 12px;
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0,0,0,0.03);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 15px;
      padding-top: 15px;
      border-top: 1px solid #f1f5f9;
    }

    .avatar-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #00d2ff, #7928ca);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    /* Token Price Table */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .token-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 20px;
      text-align: center;
      transition: all 0.3s ease;
    }

    .token-card.popular {
      border: 2px solid #00d2ff;
      box-shadow: 0 8px 25px rgba(0, 210, 255, 0.15);
      position: relative;
    }

    .token-card.popular::before {
      content: '超高性价比';
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: #00d2ff;
      color: #ffffff;
      font-size: 0.75rem;
      padding: 2px 10px;
      border-radius: 10px;
      font-weight: 600;
    }

    .price-val {
      font-size: 1.8rem;
      font-weight: 800;
      color: #0072ff;
      margin: 10px 0;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dark);
    }

    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      color: #0072ff;
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-question::after {
      content: '−';
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: var(--text-muted);
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px;
      border-top: 1px solid #f1f5f9;
    }

    /* Form Design */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 35px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group.full {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: #0072ff;
      box-shadow: 0 0 0 3px rgba(0, 114, 255, 0.15);
    }

    /* Model Tags Cloud */
    .model-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-badge {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      color: #334155;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }
    .model-badge:hover {
      border-color: #00d2ff;
      color: #0072ff;
      transform: translateY(-2px);
    }

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

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

    .footer-brand p {
      margin-top: 12px;
      font-size: 0.9rem;
      color: #64748b;
      line-height: 1.6;
    }

    .footer-title {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
    }

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

    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: #00d2ff;
    }

    .friend-links-box {
      margin-top: 30px;
      padding-top: 20px;
      border-top: 1px solid #1e293b;
      font-size: 0.88rem;
    }

    .friend-links-box span {
      color: #ffffff;
      margin-right: 12px;
    }

    .friend-links-box a {
      color: #94a3b8;
      margin-right: 15px;
      display: inline-block;
    }

    .copyright {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid #1e293b;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* Floating CS Widget */
    .floating-cs {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .cs-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: linear-gradient(135deg, #00d2ff, #7928ca);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4);
      cursor: pointer;
      font-size: 1.2rem;
      position: relative;
    }

    .cs-popover {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 15px;
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.15);
      width: 200px;
      text-align: center;
      display: none;
      border: 1px solid #e2e8f0;
      color: #0f172a;
    }

    .cs-btn:hover .cs-popover {
      display: block;
    }

    .cs-popover img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      margin-bottom: 8px;
    }

    /* Media Queries for Mobile Responsiveness */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .token-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .hero-title { font-size: 2rem; }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .grid-2, .grid-3, .grid-4, .token-grid { grid-template-columns: 1fr; }
      .menu-toggle { display: block; }
      
      .nav-links {
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        display: none;
        gap: 0; /* MAINTAIN GAP 0 */
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        padding: 12px;
        width: 100%;
      }
      
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full { grid-column: span 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }