:root {
      --bg-dark: #090412;
      --bg-card: rgba(23, 13, 41, 0.78);
      --bg-card-hover: rgba(36, 21, 64, 0.9);
      --primary: #ff1493;
      --primary-neon: #ff007f;
      --secondary: #9d00ff;
      --accent-cyan: #00f2fe;
      --text-main: #f5f0ff;
      --text-muted: #bda8df;
      --border-glow: rgba(255, 20, 147, 0.35);
      --border-purple: rgba(157, 0, 255, 0.4);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

    body {
      background-color: var(--bg-dark);
      background-image: 
        radial-gradient(circle at 10% 15%, rgba(255, 20, 147, 0.15) 0%, transparent 45%),
        radial-gradient(circle at 90% 45%, rgba(157, 0, 255, 0.18) 0%, transparent 50%),
        radial-gradient(circle at 50% 85%, rgba(0, 242, 254, 0.1) 0%, transparent 55%);
      background-attachment: fixed;
      color: var(--text-main);
      font-family: var(--font-sans);
      line-height: 1.6;
      overflow-x: hidden;
    }

    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;
    }

    /* 头部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(9, 4, 18, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-glow);
    }

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

    .nav-left {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .logo-link {
      display: flex;
      align-items: center;
      height: 44px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(90deg, #ffffff, #ff72c0, #00f2fe);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: 0.5px;
    }

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

    .nav-links a {
      padding: 8px 13px;
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
      text-shadow: 0 0 10px rgba(255, 20, 147, 0.7);
    }

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

    .btn-nav-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      background: linear-gradient(135deg, var(--primary-neon), var(--secondary));
      color: #fff;
      font-weight: 600;
      font-size: 0.88rem;
      border-radius: 99px;
      box-shadow: 0 0 14px rgba(255, 20, 147, 0.45);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .btn-nav-primary:hover {
      box-shadow: 0 0 22px rgba(255, 20, 147, 0.75);
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-toggle svg {
      width: 26px;
      height: 26px;
      stroke: currentColor;
    }

    /* Hero 首屏 - 纯 CSS 视觉，无图片 */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(255, 20, 147, 0.12);
      border: 1px solid var(--border-glow);
      border-radius: 999px;
      font-size: 0.85rem;
      color: #ff91cc;
      margin-bottom: 24px;
      box-shadow: inset 0 0 12px rgba(255, 20, 147, 0.2);
    }

    .hero-badge .glow-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent-cyan);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent-cyan);
      animation: pulse 2s infinite;
    }

    .hero-title {
      font-size: 2.6rem;
      line-height: 1.25;
      font-weight: 900;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
      color: #ffffff;
      text-shadow: 0 0 25px rgba(255, 20, 147, 0.35);
    }

    .hero-title span {
      background: linear-gradient(135deg, #ff007f 0%, #d400ff 50%, #00f2fe 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      max-width: 780px;
      margin: 0 auto 34px;
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .btn-main-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 99px;
      background: linear-gradient(90deg, #ff007f, #8a2be2);
      color: #fff;
      box-shadow: 0 0 26px rgba(255, 0, 127, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.3);
    }

    .btn-main-glow:hover {
      box-shadow: 0 0 36px rgba(255, 0, 127, 0.85);
      transform: translateY(-2px);
    }

    .btn-sub-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      font-size: 1.02rem;
      font-weight: 600;
      border-radius: 99px;
      background: rgba(255, 255, 255, 0.05);
      color: #e0d4ff;
      border: 1px solid var(--border-purple);
      backdrop-filter: blur(8px);
    }

    .btn-sub-outline:hover {
      background: rgba(157, 0, 255, 0.2);
      color: #fff;
      border-color: #ff007f;
    }

    /* 数据指标条 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .metric-card {
      background: var(--bg-card);
      border: 1px solid var(--border-purple);
      border-radius: 14px;
      padding: 24px 16px;
      text-align: center;
      backdrop-filter: blur(10px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
      transition: all 0.3s;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary-neon);
      box-shadow: 0 12px 28px rgba(255, 20, 147, 0.22);
    }

    .metric-num {
      font-size: 2.1rem;
      font-weight: 800;
      color: #00f2fe;
      margin-bottom: 6px;
      text-shadow: 0 0 12px rgba(0, 242, 254, 0.5);
    }

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

    /* 通用章节规范 */
    .section-spacing {
      padding: 80px 0;
      position: relative;
    }

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

    .section-eyebrow {
      display: inline-block;
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: var(--accent-cyan);
      font-weight: 700;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      margin-bottom: 14px;
      color: #fff;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 模型墙滚动展示 */
    .model-pills-wrapper {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-bottom: 40px;
    }

    .model-pill {
      background: rgba(255, 20, 147, 0.08);
      border: 1px solid rgba(255, 20, 147, 0.25);
      color: #ffcef1;
      padding: 7px 16px;
      border-radius: 8px;
      font-size: 0.85rem;
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: all 0.2s;
    }

    .model-pill:hover {
      background: rgba(255, 20, 147, 0.3);
      color: #fff;
      transform: scale(1.05);
      box-shadow: 0 0 12px rgba(255, 20, 147, 0.5);
    }

    /* 卡片网格 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-purple);
      border-radius: 16px;
      padding: 30px 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      backdrop-filter: blur(10px);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

    .feature-card:hover {
      transform: translateY(-6px);
      background: var(--bg-card-hover);
      border-color: var(--primary-neon);
      box-shadow: 0 14px 35px rgba(255, 20, 147, 0.2);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(255, 20, 147, 0.2), rgba(0, 242, 254, 0.2));
      border: 1px solid var(--border-glow);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: #fff;
    }

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

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .tag-mini {
      font-size: 0.75rem;
      padding: 3px 8px;
      background: rgba(255, 255, 255, 0.05);
      border-radius: 4px;
      color: #dfc8ff;
      border: 1px solid rgba(255, 255, 255, 0.08);
    }

    /* 图文混排与案例媒体区 */
    .media-block-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 36px;
      align-items: center;
      margin-bottom: 50px;
    }

    .media-card-frame {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: 16px;
      padding: 16px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    }

    .media-img-container {
      border-radius: 12px;
      overflow: hidden;
      aspect-ratio: 16 / 9;
      background: #150b28;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

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

    .media-img-container:hover img {
      transform: scale(1.03);
    }

    /* 评测与对比表格板块 */
    .rating-highlight {
      background: linear-gradient(135deg, rgba(255, 20, 147, 0.15), rgba(157, 0, 255, 0.2));
      border: 1px solid var(--border-glow);
      border-radius: 18px;
      padding: 36px;
      text-align: center;
      margin-bottom: 40px;
      box-shadow: 0 0 30px rgba(255, 20, 147, 0.25);
    }

    .rating-score {
      font-size: 3.5rem;
      font-weight: 900;
      color: #ffeb3b;
      text-shadow: 0 0 20px rgba(255, 235, 59, 0.6);
      line-height: 1;
      margin-bottom: 10px;
    }

    .rating-stars {
      color: #ffeb3b;
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: 16px;
      border: 1px solid var(--border-purple);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .compare-table th, 
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.94rem;
    }

    .compare-table th {
      background: rgba(35, 17, 66, 0.9);
      color: #fff;
      font-weight: 700;
    }

    .compare-table tr:hover {
      background: rgba(255, 20, 147, 0.05);
    }

    .highlight-col {
      color: #ff47a4;
      font-weight: 700;
      background: rgba(255, 20, 147, 0.07);
    }

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

    .step-box {
      background: var(--bg-card);
      border: 1px solid var(--border-purple);
      border-radius: 14px;
      padding: 24px 18px;
      position: relative;
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: rgba(255, 255, 255, 0.12);
      position: absolute;
      top: 14px;
      right: 18px;
    }

    .step-box h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #00f2fe;
      margin-bottom: 8px;
    }

    .step-box p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

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

    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-purple);
      border-radius: 16px;
      padding: 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      backdrop-filter: blur(8px);
    }

    .testimonial-quote {
      font-size: 0.93rem;
      color: #e3d9f3;
      margin-bottom: 20px;
      line-height: 1.6;
      font-style: italic;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 14px;
    }

    .user-avatar-text {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-neon), var(--secondary));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
      color: #fff;
    }

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

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

    /* FAQ 折叠组件 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-purple);
      border-radius: 12px;
      overflow: hidden;
      transition: border-color 0.25s ease;
    }

    .faq-item.active {
      border-color: var(--primary-neon);
      box-shadow: 0 0 16px rgba(255, 20, 147, 0.2);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.02rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.3s ease;
      background: rgba(14, 7, 28, 0.4);
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

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

    /* 表单与联络板块 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: 20px;
      padding: 40px;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }

    .contact-info-col {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .qr-card {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-purple);
      border-radius: 14px;
      padding: 18px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .qr-card img {
      width: 100px;
      height: 100px;
      border-radius: 8px;
      background: #fff;
    }

    .contact-meta-item {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .contact-label {
      font-size: 0.8rem;
      color: var(--accent-cyan);
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .contact-val {
      font-size: 1rem;
      font-weight: 600;
      color: #ffffff;
    }

    /* 表单样式 */
    .demand-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

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

    .form-group label {
      font-size: 0.86rem;
      color: #d6cbfa;
      font-weight: 500;
    }

    .form-control {
      background: rgba(10, 5, 20, 0.7);
      border: 1px solid rgba(157, 0, 255, 0.4);
      border-radius: 8px;
      padding: 12px 14px;
      color: #fff;
      font-size: 0.92rem;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary-neon);
      box-shadow: 0 0 10px rgba(255, 20, 147, 0.35);
    }

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

    .btn-submit {
      padding: 14px;
      background: linear-gradient(135deg, var(--primary-neon), var(--secondary));
      color: #fff;
      border: none;
      border-radius: 8px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 0 18px rgba(255, 20, 147, 0.5);
      transition: all 0.25s ease;
    }

    .btn-submit:hover {
      box-shadow: 0 0 28px rgba(255, 20, 147, 0.8);
      transform: translateY(-2px);
    }

    /* 文章列表 & 友情链接 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-bottom: 40px;
    }

    .article-item {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 10px;
      padding: 16px;
      transition: border-color 0.2s;
    }

    .article-item:hover {
      border-color: var(--accent-cyan);
    }

    .article-item a {
      font-size: 0.9rem;
      color: var(--text-muted);
      display: block;
      line-height: 1.5;
    }

    .article-item a:hover {
      color: #fff;
    }

    .footer-links-box {
      background: rgba(14, 7, 28, 0.8);
      border: 1px solid rgba(157, 0, 255, 0.3);
      border-radius: 12px;
      padding: 24px;
      margin-bottom: 40px;
    }

    .footer-links-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 12px;
    }

    .footer-links-content {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .footer-links-content a {
      font-size: 0.86rem;
      color: var(--text-muted);
      padding: 4px 10px;
      background: rgba(255, 255, 255, 0.04);
      border-radius: 6px;
    }

    .footer-links-content a:hover {
      color: #ff47a4;
      background: rgba(255, 20, 147, 0.1);
    }

    /* 底部收尾 */
    footer.site-footer {
      border-top: 1px solid var(--border-glow);
      background: #06020c;
      padding: 40px 0 30px;
      text-align: center;
    }

    .footer-copy {
      font-size: 0.85rem;
      color: #8c7ba8;
      line-height: 1.6;
    }

    /* 浮动客服入口 */
    .floating-cs {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ff007f, #8a2be2);
      border: 1px solid rgba(255, 255, 255, 0.4);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 0 16px rgba(255, 0, 127, 0.6);
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      transform: scale(1.1);
      box-shadow: 0 0 24px rgba(255, 0, 127, 0.9);
    }

    .float-btn svg {
      width: 24px;
      height: 24px;
      fill: currentColor;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.3); opacity: 0.6; }
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .feature-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid, .timeline-flow {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-block-grid {
        grid-template-columns: 1fr;
      }
      .contact-layout {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0d061a;
        flex-direction: column;
        align-items: stretch;
        border-bottom: 1px solid var(--border-glow);
        padding: 16px 0;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        padding: 12px 24px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      }
      .mobile-menu-toggle {
        display: block;
      }
      .feature-grid, .testimonials-grid, .metrics-grid, .timeline-flow {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-buttons {
        flex-direction: column;
      }
      .btn-main-glow, .btn-sub-outline {
        width: 100%;
      }
    }