:root {
      --bg-primary: #090a16;
      --bg-surface: #10142a;
      --bg-surface-elevated: #161c3b;
      --text-main: #f0f3fc;
      --text-muted: #9aa8cc;
      --text-dim: #64748b;
      --neon-cyan: #00f0ff;
      --neon-purple: #bd00ff;
      --neon-pink: #ff007f;
      --neon-gradient: linear-gradient(135deg, #00f0ff 0%, #bd00ff 50%, #ff007f 100%);
      --neon-glow: 0 0 25px rgba(0, 240, 255, 0.35);
      --card-border: 1px solid rgba(0, 240, 255, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
    }

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

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

    body {
      background-color: var(--bg-primary);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 15% 15%, rgba(189, 0, 255, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(0, 240, 255, 0.1) 0%, transparent 45%),
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
      background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
      background-attachment: fixed;
    }

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

    ul, ol {
      list-style: 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 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      background: rgba(9, 10, 22, 0.85);
      border-bottom: 1px solid rgba(0, 240, 255, 0.18);
    }

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

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

    .brand-zone .logo-box {
      display: flex;
      align-items: center;
      max-height: 42px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
      filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.5));
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: 0.5px;
      background: var(--neon-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      padding: 8px 14px;
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--neon-cyan);
      background: rgba(0, 240, 255, 0.08);
      text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
    }

    .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: 600;
      border-radius: 40px;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
      border: 1px solid transparent;
      text-align: center;
      white-space: nowrap;
    }

    .btn-neon-primary {
      background: var(--neon-gradient);
      color: #ffffff;
      box-shadow: 0 0 16px rgba(189, 0, 255, 0.4);
    }

    .btn-neon-primary:hover {
      box-shadow: 0 0 24px rgba(0, 240, 255, 0.7);
      transform: translateY(-2px);
    }

    .btn-neon-outline {
      background: rgba(0, 240, 255, 0.05);
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
    }

    .btn-neon-outline:hover {
      background: rgba(0, 240, 255, 0.15);
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
      transform: translateY(-2px);
    }

    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: 1px solid rgba(0, 240, 255, 0.3);
      color: var(--neon-cyan);
      font-size: 1.5rem;
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* 区域通配 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      text-transform: uppercase;
      letter-spacing: 2px;
      padding: 4px 14px;
      border-radius: 30px;
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid rgba(0, 240, 255, 0.3);
      color: var(--neon-cyan);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 14px;
      color: #ffffff;
      letter-spacing: -0.5px;
    }

    .section-desc {
      color: var(--text-muted);
      font-size: 1.05rem;
      line-height: 1.6;
    }

    /* 首屏 Hero 无图片纯技术质感 */
    .hero-section {
      padding: 100px 0 80px 0;
      min-height: calc(100vh - 76px);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-glow-blob {
      position: absolute;
      width: 480px;
      height: 480px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(189, 0, 255, 0.25) 0%, rgba(0, 240, 255, 0) 70%);
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      pointer-events: none;
      z-index: 0;
      filter: blur(50px);
    }

    .hero-content {
      position: relative;
      z-index: 1;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 24px;
      background: linear-gradient(135deg, #ffffff 30%, var(--neon-cyan) 75%, var(--neon-purple) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 18px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .btn-hero-large {
      padding: 15px 36px;
      font-size: 1.15rem;
      font-weight: 700;
      border-radius: 50px;
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.45);
    }

    .hero-badges-stream {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 20px;
      padding-top: 30px;
      border-top: 1px dashed rgba(255, 255, 255, 0.1);
    }

    .model-chip {
      background: rgba(22, 28, 59, 0.7);
      border: 1px solid rgba(0, 240, 255, 0.25);
      color: #d1dcff;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      transition: all 0.25s ease;
    }

    .model-chip:hover {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
      transform: translateY(-2px);
      color: #ffffff;
    }

    /* 核心数据面板 */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .metric-card {
      background: var(--bg-surface);
      border: var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      transition: transform 0.3s ease, border-color 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-5px);
      border-color: var(--neon-cyan);
      box-shadow: var(--neon-glow);
    }

    .metric-val {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--neon-cyan);
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* 通用卡片网格 */
    .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;
      align-items: center;
    }

    .service-card {
      background: var(--bg-surface);
      border: var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
      overflow: hidden;
      transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--neon-gradient);
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0, 240, 255, 0.4);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 15px rgba(0, 240, 255, 0.2);
    }

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

    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(0, 240, 255, 0.08);
      border: 1px solid rgba(0, 240, 255, 0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 1.4rem;
      color: var(--neon-cyan);
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #ffffff;
    }

    .service-card p {
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
    }

    /* 案例图片展示容器规范 */
    .media-card-box {
      background: var(--bg-surface);
      border: var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }

    .media-card-box:hover {
      border-color: var(--neon-purple);
      box-shadow: 0 8px 24px rgba(189, 0, 255, 0.25);
    }

    .media-thumb-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #000;
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-thumb-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .media-thumb-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .media-card-box:hover .media-thumb-wrap img {
      transform: scale(1.05);
    }

    .media-body {
      padding: 20px;
    }

    .media-body h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: #fff;
    }

    .media-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 流程步骤 */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: var(--bg-surface);
      border: var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      position: relative;
    }

    .step-badge {
      width: 44px;
      height: 44px;
      line-height: 44px;
      border-radius: 50%;
      background: var(--neon-gradient);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.1rem;
      margin: 0 auto 16px auto;
      box-shadow: 0 0 15px rgba(189, 0, 255, 0.4);
    }

    .step-item h4 {
      font-size: 1.15rem;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .step-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测表格与评测面板 */
    .review-score-banner {
      background: linear-gradient(135deg, rgba(0, 240, 255, 0.15) 0%, rgba(189, 0, 255, 0.15) 100%);
      border: 1px solid var(--neon-cyan);
      border-radius: var(--radius-md);
      padding: 30px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.2);
    }

    .score-intro h3 {
      font-size: 1.6rem;
      color: #ffffff;
      margin-bottom: 6px;
    }

    .score-intro p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .score-digits {
      display: flex;
      align-items: baseline;
      gap: 10px;
    }

    .score-num {
      font-size: 3.4rem;
      font-weight: 900;
      color: var(--neon-cyan);
      text-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
      line-height: 1;
    }

    .score-scale {
      font-size: 1.1rem;
      color: var(--text-muted);
    }

    .stars-box {
      color: #ffb703;
      font-size: 1.3rem;
      letter-spacing: 2px;
      margin-top: 4px;
    }

    .table-container {
      overflow-x: auto;
      border-radius: var(--radius-md);
      border: var(--card-border);
      background: var(--bg-surface);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 720px;
    }

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

    .comparison-table th {
      background: rgba(0, 0, 0, 0.35);
      color: var(--neon-cyan);
      font-weight: 700;
      font-size: 0.95rem;
    }

    .comparison-table tr:hover td {
      background: rgba(0, 240, 255, 0.03);
    }

    .highlight-cell {
      color: #00f0ff;
      font-weight: 600;
      background: rgba(0, 240, 255, 0.05);
    }

    .dim-cell {
      color: var(--text-dim);
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: var(--bg-surface);
      border: var(--card-border);
      border-radius: var(--radius-md);
      padding: 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.3s ease;
    }

    .testimonial-card:hover {
      transform: translateY(-4px);
      border-color: var(--neon-cyan);
    }

    .testimonial-text {
      color: #d1dcff;
      font-size: 0.94rem;
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 14px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--neon-gradient);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
    }

    .user-meta h5 {
      font-size: 0.95rem;
      color: #ffffff;
    }

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

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-surface);
      border: var(--card-border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.25s ease;
    }

    .faq-item.active {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.15);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: transparent;
      border: none;
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-toggle-icon {
      font-size: 1.3rem;
      color: var(--neon-cyan);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }

    /* 文章与资讯专区 */
    .articles-section {
      background: rgba(16, 20, 42, 0.6);
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }

    .article-anchor-card {
      background: var(--bg-surface);
      border: var(--card-border);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      gap: 12px;
      transition: all 0.25s ease;
    }

    .article-anchor-card:hover {
      border-color: var(--neon-cyan);
      transform: translateX(4px);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
    }

    .article-anchor-card span {
      color: var(--neon-cyan);
      font-weight: bold;
    }

    /* 表单与联系区 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-surface);
      border: var(--card-border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }

    .form-panel form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .form-group label {
      font-size: 0.9rem;
      color: #d1dcff;
      font-weight: 500;
    }

    .form-control {
      background: rgba(9, 10, 22, 0.8);
      border: 1px solid rgba(0, 240, 255, 0.2);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: #ffffff;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.25s ease;
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    }

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

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-direct-items {
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin: 20px 0;
    }

    .direct-item {
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .direct-item strong {
      color: #ffffff;
      min-width: 80px;
    }

    .qr-showcase {
      display: flex;
      align-items: center;
      gap: 20px;
      background: rgba(9, 10, 22, 0.6);
      padding: 16px;
      border-radius: var(--radius-md);
      border: 1px dashed rgba(0, 240, 255, 0.3);
    }

    .qr-box {
      width: 100px;
      height: 100px;
      background: #fff;
      padding: 4px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .qr-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .qr-tip h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 4px;
    }

    .qr-tip p {
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    /* 友情链接与页脚 */
    footer.site-footer {
      background: #06070e;
      border-top: 1px solid rgba(0, 240, 255, 0.2);
      padding: 50px 0 30px 0;
      color: var(--text-muted);
    }

    .footer-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      margin-bottom: 30px;
      padding-bottom: 24px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .footer-links-row span {
      color: #ffffff;
      font-weight: 600;
      margin-right: 8px;
    }

    .footer-links-row a {
      color: var(--text-muted);
      font-size: 0.9rem;
      padding: 4px 10px;
      background: rgba(255, 255, 255, 0.03);
      border-radius: 4px;
    }

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

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.88rem;
    }

    .footer-nav-chain {
      display: flex;
      gap: 16px;
    }

    .footer-nav-chain a:hover {
      color: var(--neon-cyan);
    }

    /* 悬浮客服面板 */
    .floating-assistant {
      position: fixed;
      bottom: 30px;
      right: 25px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg-surface-elevated);
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--neon-cyan);
      color: #000000;
    }

    /* 响应式样式适配 */
    @media (max-width: 992px) {
      .grid-4, .metric-grid, .steps-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 2.5rem;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: rgba(9, 10, 22, 0.98);
        border-bottom: 1px solid var(--neon-cyan);
        flex-direction: column;
        padding: 20px 0;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        text-align: center;
        padding: 12px;
      }
      .header-actions .btn-login {
        display: none;
      }
      .grid-4, .grid-3, .grid-2, .metric-grid, .steps-row, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .hero-subtitle {
        font-size: 1.05rem;
      }
      .score-digits {
        justify-content: center;
      }
      .review-score-banner {
        text-align: center;
        justify-content: center;
      }
    }