/* CSS RESET & VARIABLES - VIBRANT YELLOW TECH LIGHT STYLE */
    :root {
      --primary-yellow: #FFC700;
      --primary-yellow-hover: #E5B200;
      --primary-dark: #0F172A;
      --secondary-dark: #1E293B;
      --text-muted: #475569;
      --bg-light: #FAF9F6;
      --bg-white: #FFFFFF;
      --card-bg: #FFFFFF;
      --border-color: #E2E8F0;
      --accent-glow: rgba(255, 199, 0, 0.25);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      --container-max-width: 1200px;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
      --shadow-yellow: 0 10px 30px -5px rgba(255, 199, 0, 0.35);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--bg-light);
      color: var(--primary-dark);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

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

    /* SECTION BASES */
    .section {
      padding: 80px 0;
      position: relative;
    }

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

    .section-title-wrap {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-badge {
      display: inline-block;
      background: #FFFBEB;
      color: #D97706;
      font-weight: 700;
      font-size: 0.85rem;
      padding: 4px 14px;
      border-radius: 50px;
      border: 1px solid #FDE68A;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

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

    /* HEADER & NAV */
    .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);
    }

    .header-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

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

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

    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary-dark);
    }

    /* MANDATORY CONSTRAINT: .nav-links gap must be 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: 0.9rem;
      font-weight: 600;
      color: var(--secondary-dark);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary-dark);
      background-color: var(--primary-yellow);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 50px;
      cursor: pointer;
      border: none;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary-yellow);
      color: var(--primary-dark);
      box-shadow: 0 4px 14px rgba(255, 199, 0, 0.4);
    }

    .btn-primary:hover {
      background-color: var(--primary-yellow-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-yellow);
    }

    .btn-dark {
      background-color: var(--primary-dark);
      color: #FFFFFF;
    }

    .btn-dark:hover {
      background-color: var(--secondary-dark);
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 2px solid var(--primary-dark);
      background: transparent;
      color: var(--primary-dark);
    }

    .btn-outline:hover {
      background-color: var(--primary-dark);
      color: #FFFFFF;
    }

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

    /* HERO SECTION - STRICT NO IMAGES */
    .hero {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 50% 20%, rgba(255, 199, 0, 0.15) 0%, rgba(250, 249, 246, 0) 70%), var(--bg-light);
      text-align: center;
      position: relative;
    }

    .hero-badge-wrap {
      margin-bottom: 20px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid var(--primary-yellow);
      padding: 6px 18px;
      border-radius: 50px;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--primary-dark);
      box-shadow: var(--shadow-sm);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 8px #10B981;
    }

    /* H1改写 控制在20字以内 */
    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--primary-dark);
      max-width: 900px;
      margin: 0 auto 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #D97706 0%, #B45309 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      position: relative;
    }

    .hero-title span::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 0;
      width: 100%;
      height: 8px;
      background-color: var(--primary-yellow);
      z-index: -1;
      opacity: 0.6;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 36px;
      font-weight: 400;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
    }

    .stat-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary-yellow);
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .stat-number sub {
      font-size: 1rem;
      color: #D97706;
      font-weight: 700;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* GRID & CARDS */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .feature-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--primary-yellow);
      opacity: 0;
      transition: opacity 0.3s ease;
    }

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

    .feature-card:hover::before {
      opacity: 1;
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      background: #FFFBEB;
      border: 1px solid #FDE68A;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }

    .feature-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* ABOUT PLATFORM */
    .about-box {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .model-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .model-tag {
      background: #F1F5F9;
      color: var(--secondary-dark);
      padding: 6px 14px;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 600;
      border: 1px solid #E2E8F0;
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      background: var(--primary-yellow);
      color: var(--primary-dark);
      border-color: var(--primary-yellow);
    }

    /* SCENE CARDS (30 SECTIONS) */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .scene-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      padding: 22px;
      border-radius: var(--radius-md);
      transition: all 0.25s ease;
    }

    .scene-card:hover {
      border-color: var(--primary-yellow);
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
    }

    .scene-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: #D97706;
      background: #FFFBEB;
      padding: 3px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .scene-name {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }

    .scene-info {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* PROCESS STEP TIMELINE */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

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

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-yellow);
      color: var(--primary-dark);
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    .step-title {
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* COMPARISON TABLE */
    .comparison-wrapper {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
    }

    .comp-header-score {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #FFFBEB;
      border: 1px solid #FDE68A;
      padding: 20px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 24px;
    }

    .score-left h3 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--primary-dark);
    }

    .score-stars {
      color: #F59E0B;
      font-size: 1.2rem;
      margin-left: 8px;
    }

    .score-big {
      font-size: 2.2rem;
      font-weight: 900;
      color: #D97706;
    }

    .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;
      font-weight: 700;
      color: var(--primary-dark);
    }

    .comp-table tr:hover td {
      background: #FAF9F6;
    }

    .highlight-col {
      background: rgba(255, 199, 0, 0.08);
      font-weight: 700;
      color: var(--primary-dark);
    }

    /* TOKEN PRICE TABLE */
    .token-table-wrap {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
    }

    .token-table {
      width: 100%;
      border-collapse: collapse;
    }

    .token-table th, .token-table td {
      padding: 14px 20px;
      border-bottom: 1px solid var(--border-color);
      text-align: left;
      font-size: 0.9rem;
    }

    .token-table th {
      background: var(--primary-dark);
      color: #FFFFFF;
    }

    .badge-cheap {
      background: #DEF7EC;
      color: #03543F;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
    }

    /* CASE DISPLAY WITH PERMITTED ASSETS */
    .case-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #E2E8F0;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

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

    .case-content {
      padding: 20px;
    }

    .case-title {
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* REVIEWS SECTION (6 ITEMS) */
    .review-card {
      background: var(--bg-white);
      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: var(--primary-yellow);
      color: var(--primary-dark);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .user-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
    }

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

    .review-stars {
      color: #F59E0B;
      font-size: 0.85rem;
      margin-bottom: 10px;
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--secondary-dark);
      line-height: 1.6;
    }

    /* FAQ ACCORDION */
    .faq-grid {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: #FFFBEB;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #FAF9F6;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px;
      border-top: 1px solid var(--border-color);
    }

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

    /* FORM & CONTACT */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .contact-info-card {
      background: var(--primary-dark);
      color: #FFFFFF;
      padding: 40px;
      border-radius: var(--radius-lg);
    }

    .contact-info-card h3 {
      font-size: 1.6rem;
      margin-bottom: 20px;
      color: var(--primary-yellow);
    }

    .contact-item-line {
      margin-bottom: 16px;
      font-size: 0.95rem;
    }

    .contact-qr-wrap {
      margin-top: 24px;
      padding: 16px;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
    }

    .contact-qr-wrap img {
      width: 140px;
      height: 140px;
      margin: 0 auto 8px;
    }

    .contact-qr-wrap p {
      color: var(--primary-dark);
      font-weight: 700;
      font-size: 0.85rem;
    }

    .form-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--primary-dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-family: inherit;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.25s ease;
    }

    .form-control:focus {
      border-color: var(--primary-yellow);
      box-shadow: 0 0 0 3px var(--accent-glow);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* FOOTER & FRIEND LINKS */
    .footer {
      background: #0F172A;
      color: #94A3B8;
      padding: 60px 0 30px;
      border-top: 1px solid #1E293B;
    }

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

    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.88rem;
      line-height: 1.6;
    }

    .footer-col h5 {
      color: #FFFFFF;
      font-size: 1rem;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a {
      color: #94A3B8;
      font-size: 0.88rem;
    }

    .footer-links a:hover {
      color: var(--primary-yellow);
    }

    .friend-links-box {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      margin-top: 30px;
      font-size: 0.85rem;
    }

    .friend-links-box h6 {
      color: #E2E8F0;
      margin-bottom: 10px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friend-links-list a {
      color: #64748B;
    }

    .friend-links-list a:hover {
      color: var(--primary-yellow);
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      margin-top: 30px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748B;
    }

    .ai-page-home-link {
      color: var(--primary-yellow) !important;
      font-weight: 700;
    }

    /* FLOATING WIDGET */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary-yellow);
      color: var(--primary-dark);
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.85rem;
      box-shadow: 0 10px 25px rgba(255, 199, 0, 0.5);
      cursor: pointer;
      border: 2px solid #FFFFFF;
      transition: transform 0.25s ease;
    }

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

    /* RESPONSIVE MEDIA QUERIES */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        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;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }