:root {
      --bg-main: #060b19;
      --bg-card: #0c162d;
      --bg-card-hover: #122040;
      --neon-cyan: #00f0ff;
      --neon-purple: #9d4edd;
      --neon-pink: #ff007f;
      --neon-green: #00ffaa;
      --text-main: #f8fafc;
      --text-sub: #94a3b8;
      --text-muted: #64748b;
      --border-glow: rgba(0, 240, 255, 0.25);
      --border-light: rgba(255, 255, 255, 0.08);
      --container-max: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --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, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 50% 0%, #102046 0%, #060b19 75%);
      min-height: 100vh;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(6, 11, 25, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 700;
      color: #fff;
    }

    .brand-logo img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

    .nav-links li a {
      font-size: 0.92rem;
      color: var(--text-sub);
      transition: var(--transition);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--neon-cyan);
      text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-neon {
      background: linear-gradient(135deg, var(--neon-cyan), #00a8ff);
      color: #030a1a;
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 26px rgba(0, 240, 255, 0.7);
      background: linear-gradient(135deg, #33f3ff, #1ab0ff);
    }

    .btn-outline {
      border-color: var(--neon-purple);
      color: #e0b0ff;
      background: rgba(157, 78, 221, 0.1);
    }

    .btn-outline:hover {
      background: rgba(157, 78, 221, 0.25);
      border-color: #c77dff;
      color: #fff;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-main);
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* 模块通用样式 */
    section {
      padding: 70px 0;
      position: relative;
    }

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

    .badge-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.8rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--neon-cyan);
      background: rgba(0, 240, 255, 0.08);
      border: 1px solid rgba(0, 240, 255, 0.3);
      border-radius: 20px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-sub);
    }

    /* 首屏 Hero (严格无图片) */
    .hero-section {
      padding: 90px 0 60px;
      position: relative;
      overflow: hidden;
      text-align: center;
    }

    .hero-glow-1 {
      position: absolute;
      top: -100px;
      left: 50%;
      transform: translateX(-50%);
      width: 650px;
      height: 350px;
      background: radial-gradient(circle, rgba(0, 240, 255, 0.18) 0%, rgba(157, 78, 221, 0.12) 50%, transparent 75%);
      filter: blur(60px);
      z-index: 0;
      pointer-events: none;
    }

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

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .hero-highlight {
      background: linear-gradient(135deg, var(--neon-cyan), #c77dff, var(--neon-pink));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-sub);
      margin-bottom: 34px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-hero-primary {
      padding: 14px 34px;
      font-size: 1.1rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .stat-card {
      background: rgba(12, 22, 45, 0.7);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 22px 16px;
      text-align: center;
      transition: var(--transition);
      backdrop-filter: blur(8px);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--neon-cyan);
      box-shadow: 0 8px 24px rgba(0, 240, 255, 0.15);
    }

    .stat-number {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--neon-cyan);
      margin-bottom: 6px;
      display: block;
    }

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

    /* 网格与卡片通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .card-neon {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card-neon:hover {
      background: var(--bg-card-hover);
      border-color: var(--neon-cyan);
      box-shadow: 0 10px 30px rgba(0, 240, 255, 0.12);
      transform: translateY(-4px);
    }

    .card-icon {
      width: 46px;
      height: 46px;
      border-radius: var(--radius-sm);
      background: rgba(0, 240, 255, 0.1);
      color: var(--neon-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 16px;
      border: 1px solid rgba(0, 240, 255, 0.2);
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-tag {
      margin-top: 14px;
      font-size: 0.8rem;
      color: var(--neon-green);
      font-weight: 600;
    }

    /* 平台矩阵 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-pill {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 0.85rem;
      color: #e2e8f0;
      transition: var(--transition);
    }

    .model-pill:hover {
      border-color: var(--neon-pink);
      color: #fff;
      box-shadow: 0 0 12px rgba(255, 0, 127, 0.3);
      transform: scale(1.05);
    }

    /* 流程步骤 */
    .workflow-step {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-num {
      position: absolute;
      top: 16px;
      right: 16px;
      font-size: 2rem;
      font-weight: 900;
      color: rgba(0, 240, 255, 0.15);
      line-height: 1;
    }

    /* 对比评测模块 */
    .eval-highlight-box {
      background: linear-gradient(135deg, rgba(0, 240, 255, 0.08), rgba(157, 78, 221, 0.1));
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

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

    .score-num {
      font-size: 3rem;
      font-weight: 900;
      color: var(--neon-cyan);
      line-height: 1;
      text-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
    }

    .score-stars {
      color: #ffd166;
      font-size: 1.25rem;
    }

    .eval-table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.9rem;
    }

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .eval-table th {
      background: rgba(255, 255, 255, 0.03);
      color: var(--text-main);
      font-weight: 700;
    }

    .eval-table tr:last-child td {
      border-bottom: none;
    }

    .table-tag-strong {
      color: var(--neon-green);
      font-weight: 700;
    }

    /* 案例展示与图文 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .showcase-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .showcase-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #020617;
      overflow: hidden;
    }

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

    .showcase-item:hover .showcase-img-wrap img {
      transform: scale(1.04);
    }

    .showcase-info {
      padding: 20px;
    }

    .gallery-banner-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: 24px;
    }

    .gallery-banner-grid img.ai-page-image {
      width: 100%;
      height: auto;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition);
      aspect-ratio: 4 / 3;
      object-fit: cover;
      display: block;
    }

    .gallery-banner-grid img.ai-page-image:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-3px);
    }

    /* 用户评论 */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 0.92rem;
      color: #cbd5e1;
      margin-bottom: 20px;
      line-height: 1.6;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 14px;
    }

    .user-avatar-placeholder {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #030a1a;
      font-size: 0.9rem;
    }

    .user-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: #fff;
    }

    .user-role {
      font-size: 0.8rem;
      color: var(--neon-cyan);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: rgba(0, 240, 255, 0.4);
    }

    .faq-header {
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: #fff;
      user-select: none;
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--neon-cyan);
      transition: transform 0.3s ease;
    }

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

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: rgba(0, 0, 0, 0.15);
    }

    .faq-body-inner {
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 表单与联系模块 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: start;
    }

    .contact-info-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px;
    }

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

    .info-list li {
      font-size: 0.95rem;
      color: #cbd5e1;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-card-box {
      margin-top: 24px;
      padding: 16px;
      background: rgba(255, 255, 255, 0.03);
      border-radius: var(--radius-sm);
      text-align: center;
      display: inline-block;
    }

    .qr-card-box img {
      max-width: 140px;
      height: auto;
      border-radius: var(--radius-sm);
      display: block;
      margin: 0 auto 8px;
    }

    .qr-label {
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    .form-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: #e2e8f0;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(6, 11, 25, 0.7);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      color: #fff;
      font-size: 0.95rem;
      transition: var(--transition);
      outline: none;
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
    }

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

    /* 文章动态与友情链接 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .article-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      color: var(--text-sub);
      font-size: 0.9rem;
      transition: var(--transition);
      display: block;
    }

    .article-item:hover {
      color: var(--neon-cyan);
      border-color: var(--neon-cyan);
      transform: translateX(4px);
    }

    .friend-links-box {
      margin-top: 40px;
      padding-top: 24px;
      border-top: 1px solid var(--border-light);
    }

    .friend-links-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: #e2e8f0;
      margin-bottom: 14px;
    }

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

    .friend-links-list a {
      font-size: 0.85rem;
      color: var(--text-muted);
      transition: var(--transition);
      background: rgba(255, 255, 255, 0.03);
      padding: 4px 12px;
      border-radius: 4px;
    }

    .friend-links-list a:hover {
      color: var(--neon-cyan);
      background: rgba(0, 240, 255, 0.08);
    }

    /* 页脚 */
    .site-footer {
      background: #030712;
      border-top: 1px solid var(--border-light);
      padding: 40px 0 24px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    /* 浮动客服 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      color: var(--neon-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
      transition: var(--transition);
      font-size: 1.1rem;
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--neon-cyan);
      color: #030a1a;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .grid-4, .hero-stats-grid, .gallery-banner-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
      .article-links-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #060b19;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-light);
        gap: 0;
      }
      .nav-links.active { display: flex; }
      .menu-toggle { display: block; }
      .grid-3, .grid-2, .showcase-grid, .article-links-grid { grid-template-columns: 1fr; }
      .hero-stats-grid { grid-template-columns: 1fr 1fr; }
      .hero-title { font-size: 1.8rem; }
      .eval-highlight-box { flex-direction: column; text-align: center; }
      .score-badge { flex-direction: column; }
    }