:root {
      --bg-base: #0a0614;
      --bg-surface: #120b22;
      --bg-card: #1b1130;
      --bg-card-hover: #261642;
      --accent-pink: #ff2a85;
      --accent-purple: #9b4dff;
      --accent-cyan: #00f2fe;
      --neon-glow: 0 0 24px rgba(255, 42, 133, 0.45);
      --purple-glow: 0 0 24px rgba(155, 77, 255, 0.45);
      --text-main: #f0eef6;
      --text-muted: #a69bb8;
      --border-line: rgba(255, 42, 133, 0.22);
      --border-hover: rgba(0, 242, 254, 0.55);
      --gradient-brand: linear-gradient(135deg, #ff2a85 0%, #9b4dff 50%, #00f2fe 100%);
      --gradient-card: linear-gradient(180deg, rgba(38, 22, 66, 0.8) 0%, rgba(18, 11, 34, 0.95) 100%);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-base);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 42, 133, 0.12) 0%, transparent 35%),
        radial-gradient(circle at 90% 60%, rgba(155, 77, 255, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 50% 90%, rgba(0, 242, 254, 0.08) 0%, transparent 45%);
      background-attachment: fixed;
    }

    .container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
      width: 100%;
    }

    header.site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      background-color: rgba(10, 6, 20, 0.85);
      border-bottom: 1px solid var(--border-line);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

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

    .brand-logo-slot {
      height: 38px;
      display: flex;
      align-items: center;
    }

    .brand-logo-slot img.ai-page-logo {
      height: 36px;
      width: auto;
      object-fit: contain;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      display: inline-block;
    }

    .nav-links a:hover {
      color: #fff;
      background: rgba(255, 42, 133, 0.15);
      text-shadow: 0 0 8px rgba(255, 42, 133, 0.8);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
      cursor: pointer;
      border: none;
      white-space: nowrap;
    }

    .btn-glow {
      background: var(--gradient-brand);
      color: #fff;
      box-shadow: var(--neon-glow);
    }

    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(255, 42, 133, 0.8), 0 0 10px rgba(0, 242, 254, 0.6);
      color: #fff;
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-main);
      border: 1px solid var(--border-line);
    }

    .btn-outline:hover {
      border-color: var(--accent-cyan);
      background: rgba(0, 242, 254, 0.1);
      color: #fff;
      box-shadow: 0 0 15px rgba(0, 242, 254, 0.3);
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-main);
      font-size: 24px;
      cursor: pointer;
    }

    section {
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-tag {
      display: inline-block;
      text-transform: uppercase;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 2px;
      padding: 4px 14px;
      background: rgba(255, 42, 133, 0.12);
      border: 1px solid var(--border-line);
      color: var(--accent-pink);
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #fff;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
      font-size: 15px;
    }

    .hero-section {
      padding: 90px 0 70px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(155, 77, 255, 0.15);
      border: 1px solid var(--accent-purple);
      border-radius: 30px;
      font-size: 13px;
      color: var(--text-main);
      margin-bottom: 24px;
      box-shadow: 0 0 15px rgba(155, 77, 255, 0.25);
    }

    .hero-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent-cyan);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent-cyan);
      animation: pulse 1.8s infinite;
    }

    .hero-title {
      font-size: 46px;
      line-height: 1.25;
      font-weight: 900;
      color: #fff;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title-highlight {
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      filter: drop-shadow(0 0 20px rgba(255, 42, 133, 0.4));
    }

    .hero-summary {
      font-size: 17px;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 35px auto;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      max-width: 1040px;
      margin: 0 auto;
    }

    .stat-card {
      background: var(--gradient-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 22px 16px;
      text-align: center;
      transition: all 0.3s ease;
    }

    .stat-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0, 242, 254, 0.15);
    }

    .stat-val {
      font-size: 30px;
      font-weight: 800;
      color: #fff;
      background: linear-gradient(90deg, #fff, var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 4px;
    }

    .stat-lbl {
      font-size: 13px;
      color: var(--text-muted);
    }

    .models-marquee-wrap {
      padding: 30px 0;
      border-top: 1px solid rgba(255, 42, 133, 0.15);
      border-bottom: 1px solid rgba(155, 77, 255, 0.15);
      background: rgba(18, 11, 34, 0.6);
      overflow: hidden;
    }

    .models-label {
      text-align: center;
      font-size: 13px;
      letter-spacing: 1px;
      color: var(--text-muted);
      margin-bottom: 15px;
      text-transform: uppercase;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 1100px;
      margin: 0 auto;
    }

    .tag-pill {
      font-size: 12px;
      padding: 6px 14px;
      border-radius: 20px;
      background: rgba(38, 22, 66, 0.7);
      border: 1px solid rgba(255, 255, 255, 0.08);
      color: #d1c8e2;
      transition: all 0.25s ease;
    }

    .tag-pill:hover {
      border-color: var(--accent-pink);
      color: #fff;
      background: rgba(255, 42, 133, 0.2);
      transform: scale(1.05);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 22px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .card {
      background: var(--gradient-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    .card:hover {
      border-color: var(--accent-pink);
      transform: translateY(-4px);
      box-shadow: 0 10px 30px rgba(255, 42, 133, 0.2);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: rgba(255, 42, 133, 0.15);
      border: 1px solid var(--border-line);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 16px;
      color: var(--accent-pink);
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 10px;
    }

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

    .eval-box {
      background: var(--gradient-card);
      border: 1px solid var(--accent-pink);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--neon-glow);
      margin-bottom: 30px;
    }

    .score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding-bottom: 20px;
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-brand {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .score-badge {
      background: var(--gradient-brand);
      padding: 6px 14px;
      border-radius: 6px;
      font-weight: 800;
      font-size: 14px;
      color: #fff;
    }

    .stars {
      color: #ffd700;
      letter-spacing: 3px;
      font-size: 18px;
    }

    .num-score {
      font-size: 38px;
      font-weight: 900;
      color: var(--accent-cyan);
      text-shadow: 0 0 15px rgba(0, 242, 254, 0.5);
    }

    .num-score small {
      font-size: 18px;
      color: var(--text-muted);
      font-weight: 400;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
    }

    table.compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    table.compare-table th, table.compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    table.compare-table th {
      background: rgba(38, 22, 66, 0.6);
      color: #fff;
      font-weight: 600;
    }

    table.compare-table td.highlight-col {
      background: rgba(255, 42, 133, 0.08);
      color: #fff;
      font-weight: 600;
    }

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

    .step-item {
      background: var(--gradient-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-item::before {
      counter-increment: flow-step;
      content: "0" counter(flow-step);
      position: absolute;
      top: 14px;
      right: 18px;
      font-size: 26px;
      font-weight: 900;
      color: rgba(255, 255, 255, 0.08);
      font-family: monospace;
    }

    .step-name {
      font-size: 17px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 8px;
    }

    .media-card {
      background: var(--gradient-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .media-thumb {
      width: 100%;
      aspect-ratio: 16 / 9;
      background-color: #120b22;
      overflow: hidden;
    }

    .media-thumb img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-thumb img {
      transform: scale(1.04);
    }

    .media-body {
      padding: 18px;
      flex: 1;
    }

    .media-title {
      font-size: 16px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 8px;
    }

    .media-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

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

    .faq-card {
      background: var(--gradient-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: all 0.25s ease;
    }

    .faq-card:hover {
      border-color: var(--accent-purple);
    }

    .faq-question {
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: #fff;
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: var(--accent-pink);
    }

    .faq-card.open .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px 20px;
      font-size: 14px;
      color: var(--text-muted);
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      line-height: 1.7;
    }

    .faq-card.open .faq-answer {
      display: block;
    }

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

    .user-avatar-circle {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--gradient-brand);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
      font-size: 15px;
    }

    .user-meta h4 {
      font-size: 15px;
      color: #fff;
      margin: 0;
    }

    .user-meta span {
      font-size: 12px;
      color: var(--accent-cyan);
    }

    .form-box {
      background: var(--gradient-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      padding: 35px;
      max-width: 820px;
      margin: 0 auto;
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    }

    .form-group-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-bottom: 18px;
    }

    .form-item {
      display: flex;
      flex-direction: column;
      gap: 6px;
      text-align: left;
    }

    .form-item label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      background: rgba(10, 6, 20, 0.8);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-sm);
      padding: 12px 14px;
      color: #fff;
      font-size: 14px;
      outline: none;
      transition: all 0.25s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
    }

    .form-select option {
      background: #180e2a;
      color: #fff;
    }

    .form-item.full {
      grid-column: span 2;
      margin-bottom: 18px;
    }

    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
      margin-top: 35px;
    }

    .contact-item {
      background: rgba(38, 22, 66, 0.4);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-sm);
      padding: 16px;
      text-align: center;
    }

    .contact-item h5 {
      font-size: 14px;
      color: var(--accent-cyan);
      margin-bottom: 6px;
    }

    .contact-item p {
      font-size: 13px;
      color: var(--text-main);
    }

    .article-links-box {
      background: rgba(22, 13, 38, 0.6);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 25px;
    }

    .article-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 12px;
    }

    .article-item a {
      display: block;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 13px;
      padding: 8px 12px;
      background: rgba(38, 22, 66, 0.4);
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.05);
      transition: all 0.25s ease;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .article-item a:hover {
      color: #fff;
      border-color: var(--accent-pink);
      background: rgba(255, 42, 133, 0.15);
    }

    footer.site-footer {
      background: #07040e;
      border-top: 1px solid var(--border-line);
      padding: 45px 0 25px 0;
      color: var(--text-muted);
      font-size: 13px;
    }

    .footer-main-row {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 30px;
    }

    .footer-col h4 {
      color: #fff;
      font-size: 15px;
      margin-bottom: 14px;
      font-weight: 700;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links-list a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .footer-links-list a:hover {
      color: var(--accent-pink);
    }

    .friend-links-box {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 18px;
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
    }

    .friend-links-box span {
      font-weight: 600;
      color: #fff;
    }

    .friend-links-box a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .friend-links-box a:hover {
      color: var(--accent-cyan);
    }

    .footer-bottom-copy {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
      color: #6d6282;
    }

    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 25px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid var(--accent-pink);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      font-size: 18px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
      position: relative;
      transition: all 0.3s ease;
    }

    .float-btn:hover {
      transform: scale(1.1);
      box-shadow: var(--neon-glow);
    }

    .qr-popup {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #180e2a;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 12px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.6);
      display: none;
      flex-direction: column;
      align-items: center;
      width: 140px;
      text-align: center;
    }

    .qr-popup img {
      width: 110px;
      height: 110px;
      object-fit: cover;
      border-radius: 4px;
      margin-bottom: 6px;
    }

    .qr-popup span {
      font-size: 11px;
      color: var(--text-muted);
    }

    .float-btn-wechat:hover .qr-popup {
      display: flex;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); opacity: 0.7; }
      50% { transform: scale(1.15); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.7; }
    }

    @media (max-width: 992px) {
      .hero-title {
        font-size: 36px;
      }
      .hero-stats-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-main-row {
        grid-template-columns: 1fr;
      }
      .contact-info-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      header.site-header {
        height: 64px;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: #0f081c;
        border-bottom: 1px solid var(--border-line);
        flex-direction: column;
        align-items: stretch;
        padding: 15px;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        padding: 10px 14px;
      }
      .nav-actions {
        display: none;
      }
      .hero-section {
        padding: 60px 0 45px 0;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-summary {
        font-size: 15px;
      }
      .grid-3, .grid-2, .grid-4, .step-list {
        grid-template-columns: 1fr;
      }
      .form-group-grid {
        grid-template-columns: 1fr;
      }
      .form-item.full {
        grid-column: span 1;
      }
      .form-box {
        padding: 22px 16px;
      }
    }