/* ==========================================================================
       Fluent 2 & Modern Dark Studio 设计代币体系 (100% 离线纯 CSS，零外部依赖)
       ========================================================================== */
    :root {
      --font-main: "Microsoft YaHei UI", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      --font-mono: "Consolas", "Cascadia Code", "Microsoft YaHei UI", "Microsoft YaHei", monospace;

      --bg-canvas: #0d0d0d;
      --bg-surface: #161616;
      --bg-card: rgba(255, 255, 255, 0.04);
      --bg-card-hover: rgba(255, 255, 255, 0.07);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-prominent: rgba(255, 255, 255, 0.16);

      --accent-win11: #60cdff;
      --accent-win11-hover: #70d4ff;
      --accent-win11-glow: rgba(96, 205, 255, 0.25);
      --accent-win10: #0078d4;

      --text-primary: #ffffff;
      --text-secondary: #d2d2d2;
      --text-tertiary: #929292;

      --status-success: #6ccb5f;
      --status-success-bg: rgba(16, 124, 65, 0.18);
      --status-warning: #fce100;

      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --radius-xl: 16px;

      --motion-smooth: 220ms cubic-bezier(0.1, 0.9, 0.2, 1.0);
    }

    html {
      scroll-behavior: smooth;
      width: 100%;
      max-width: 100vw;
      overflow-x: hidden;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      scrollbar-width: thin;
      scrollbar-color: rgba(255, 255, 255, 0.16) transparent;
    }

    ::-webkit-scrollbar {
      width: 6px;
      height: 6px;
    }

    ::-webkit-scrollbar-track {
      background: transparent;
    }

    ::-webkit-scrollbar-thumb {
      background: rgba(255, 255, 255, 0.16);
      border-radius: 999px;
      border: 1px solid transparent;
      background-clip: padding-box;
      transition: background var(--motion-smooth);
    }

    ::-webkit-scrollbar-thumb:hover {
      background: rgba(255, 255, 255, 0.32);
    }

    ::-webkit-scrollbar-thumb:active {
      background: rgba(255, 255, 255, 0.48);
    }

    ::-webkit-scrollbar-corner {
      background: transparent;
    }

    body {
      width: 100%;
      max-width: 100vw;
      background-color: var(--bg-canvas);
      color: var(--text-primary);
      font-family: var(--font-main);
      line-height: 1.6;
      overflow-x: hidden;
      position: relative;
      -webkit-font-smoothing: antialiased;
    }

    .btn:active, .card:active {
      transform: scale(0.985);
      transition: transform 80ms ease;
    }

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

    /* 背景星空微网格与极光流光 (自适应宽度，物理阻断横向撑开) */
    .ambient-glow {
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 100%;
      max-width: 1000px;
      height: 520px;
      background: radial-gradient(circle at 50% 30%, rgba(96, 205, 255, 0.15), rgba(0, 120, 212, 0.08) 50%, transparent 80%);
      pointer-events: none;
      z-index: 0;
      overflow: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 1;
    }

    /* --------------------------------------------------------------------------
       1. 导航栏 (Sticky Header)
       -------------------------------------------------------------------------- */
    .header {
      position: sticky;
      top: 0;
      width: 100%;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      background: rgba(13, 13, 13, 0.85);
      border-bottom: 1px solid var(--border-subtle);
      z-index: 100;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 17px;
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 26px;
      height: 26px;
      background: linear-gradient(135deg, var(--accent-win11), var(--accent-win10));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #000;
      font-weight: 800;
      font-size: 14px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-size: 14px;
      color: var(--text-secondary);
    }

    .nav-link:hover {
      color: var(--accent-win11);
      transition: color var(--motion-smooth);
    }

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

    /* 顶部导航栏语言切换器规范 */
    .lang-switcher {
      position: relative;
    }

    .lang-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      height: 38px;
      padding: 0 12px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      color: var(--text-secondary);
      font-family: inherit;
      font-size: 13px;
      font-weight: 500;
      cursor: pointer;
      transition: all var(--motion-smooth);
      white-space: nowrap;
    }

    .lang-btn:hover {
      background: rgba(255, 255, 255, 0.09);
      color: var(--text-primary);
      border-color: rgba(255, 255, 255, 0.18);
    }

    .lang-dropdown {
      display: none;
      position: absolute;
      top: calc(100% + 6px);
      right: 0;
      min-width: 136px;
      background: #1c1c1c;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      padding: 4px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
      backdrop-filter: blur(20px);
      z-index: 1000;
    }

    .lang-dropdown.show {
      display: block;
    }

    .lang-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 8px 12px;
      font-size: 13px;
      color: var(--text-secondary);
      border-radius: 4px;
      cursor: pointer;
      transition: background 0.15s ease;
    }

    .lang-item:hover {
      background: rgba(255, 255, 255, 0.08);
      color: var(--text-primary);
    }

    .lang-item.active {
      color: var(--accent-win11);
      font-weight: 600;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      height: 38px;
      padding: 0 18px;
      font-size: 13px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all var(--motion-smooth);
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--accent-win11);
      color: #000000;
      box-shadow: 0 0 16px var(--accent-win11-glow);
    }

    .btn-primary:hover {
      background: var(--accent-win11-hover);
      box-shadow: 0 0 24px rgba(96, 205, 255, 0.4);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid var(--border-subtle);
      color: var(--text-primary);
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.10);
      border-color: var(--border-prominent);
      transform: translateY(-1px);
    }

    /* --------------------------------------------------------------------------
       2. 首屏 Hero 区域
       -------------------------------------------------------------------------- */
    .hero-section {
      padding: 90px 0 60px;
      text-align: center;
    }

    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 4px 14px;
      border-radius: 9999px;
      background: rgba(96, 205, 255, 0.08);
      border: 1px solid rgba(96, 205, 255, 0.25);
      font-size: 12px;
      color: var(--accent-win11);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -1.2px;
      max-width: 860px;
      margin: 0 auto 20px;
      background: linear-gradient(180deg, #ffffff 0%, #b3b3b3 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 720px;
      margin: 0 auto 36px;
      line-height: 1.6;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 20px;
    }

    .btn-lg {
      height: 48px;
      padding: 0 28px;
      font-size: 15px;
      border-radius: var(--radius-md);
    }

    .hero-meta {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      flex-wrap: wrap;
    }

    .hero-meta-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 999px;
      font-size: 12px;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      color: var(--text-secondary);
      transition: all var(--motion-smooth);
    }

    .hero-meta-pill:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: rgba(255, 255, 255, 0.16);
      color: var(--text-primary);
    }

    .hero-meta-pill-primary {
      background: rgba(96, 205, 255, 0.06);
      border-color: rgba(96, 205, 255, 0.22);
      color: #ffffff;
    }

    .hero-meta-pill-primary:hover {
      background: rgba(96, 205, 255, 0.1);
      border-color: rgba(96, 205, 255, 0.35);
    }

    /* --------------------------------------------------------------------------
       3. Windows 优先下载矩阵与多平台路线图
       -------------------------------------------------------------------------- */
    .section {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 680px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent-win11);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.6px;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-tertiary);
    }

    .download-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
    }

    .download-card-primary {
      background: linear-gradient(135deg, rgba(96, 205, 255, 0.08) 0%, rgba(0, 120, 212, 0.04) 100%);
      border: 1.5px solid var(--accent-win11);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .download-options {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 24px;
    }

    .dl-btn-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 16px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      cursor: pointer;
      transition: all var(--motion-smooth);
      text-align: left;
    }

    .dl-btn-box:hover {
      border-color: var(--accent-win11);
      background: rgba(255, 255, 255, 0.06);
      transform: translateY(-2px);
    }

    .dl-title {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-primary);
    }

    .dl-sub {
      font-size: 12px;
      color: var(--text-tertiary);
    }

    .download-card-roadmap {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .platform-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-subtle);
    }

    .platform-row:last-child {
      border-bottom: none;
    }

    .platform-name {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      font-weight: 500;
    }

    .status-badge {
      font-size: 12px;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: var(--radius-sm);
    }

    .status-ready {
      background: var(--status-success-bg);
      color: var(--status-success);
    }

    .status-progress {
      background: rgba(252, 225, 0, 0.12);
      color: var(--status-warning);
    }

    .status-planned {
      background: rgba(255, 255, 255, 0.08);
      color: var(--text-tertiary);
    }

    /* --------------------------------------------------------------------------
       4. 四大产品级中性化核心支柱 (Rule 31 商业黑盒)
       -------------------------------------------------------------------------- */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      gap: 20px;
      transition: all var(--motion-smooth);
    }

    .feature-card:hover {
      background: var(--bg-card-hover);
      border-color: rgba(255, 255, 255, 0.18);
      transform: translateY(-2px);
    }

    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: rgba(96, 205, 255, 0.08);
      border: 1px solid rgba(96, 205, 255, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-win11);
      flex-shrink: 0;
    }

    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(96, 205, 255, 0.12) 0%, rgba(255, 255, 255, 0.03) 100%);
      border: 1px solid rgba(96, 205, 255, 0.22);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      transition: all 0.25s cubic-bezier(0.1, 0.9, 0.2, 1.0);
    }

    .feature-card:hover .feature-icon-box {
      border-color: rgba(96, 205, 255, 0.45);
      box-shadow: 0 6px 22px rgba(96, 205, 255, 0.2), inset 0 1px 2px rgba(255, 255, 255, 0.3);
      transform: translateY(-2px);
    }

    .feature-icon-box svg {
      width: 30px;
      height: 30px;
      display: block;
    }

    .feature-content h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .feature-content p {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* --------------------------------------------------------------------------
       5. 双系统 1:1 原生桌面模拟器 (Interactive Dual-OS Showcase)
       -------------------------------------------------------------------------- */
    .showcase-wrapper {
      background: #141414;
      border: 1px solid var(--border-prominent);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    }

    .showcase-toolbar {
      height: 44px;
      background: #1c1c1c;
      border-bottom: 1px solid var(--border-subtle);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 16px;
    }

    .showcase-switcher {
      display: flex;
      align-items: center;
      gap: 6px;
      background: rgba(255, 255, 255, 0.05);
      padding: 3px;
      border-radius: var(--radius-sm);
    }

    .showcase-btn {
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-secondary);
      background: transparent;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all var(--motion-smooth);
    }

    .showcase-btn.active {
      background: var(--accent-win11);
      color: #000;
    }

    .showcase-frame {
      width: 100%;
      height: 620px;
      border: none;
      display: block;
    }

    /* --------------------------------------------------------------------------
       6. 商业循环订阅中心 (Pricing Switcher)
       -------------------------------------------------------------------------- */
    .pricing-cycle-bar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-bottom: 36px;
    }

    .cycle-btn {
      padding: 8px 18px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-secondary);
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all var(--motion-smooth);
    }

    .cycle-btn.active {
      background: var(--accent-win11);
      color: #000;
      border-color: var(--accent-win11);
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .pricing-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .pricing-card.featured {
      border: 1.5px solid var(--accent-win11);
      background: linear-gradient(180deg, rgba(96, 205, 255, 0.06) 0%, rgba(22, 22, 22, 0.95) 100%);
    }

    .pricing-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent-win11);
      color: #000;
      font-size: 12px;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: var(--radius-sm);
    }

    .price-num {
      font-size: 38px;
      font-weight: 800;
      color: var(--text-primary);
      margin: 16px 0 6px;
    }

    .price-period {
      font-size: 12px;
      color: var(--text-tertiary);
      margin-bottom: 24px;
    }

    .pricing-features {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 13px;
      color: var(--text-secondary);
      margin-bottom: 30px;
    }

    .pricing-features li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .pricing-features li svg {
      width: 14px;
      height: 14px;
      fill: var(--status-success);
      flex-shrink: 0;
    }

    /* --------------------------------------------------------------------------
       7. 常见问题 (FAQ) & 页脚
       -------------------------------------------------------------------------- */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .faq-q {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-primary);
    }

    .faq-a {
      font-size: 13px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    .footer {
      border-top: 1px solid var(--border-subtle);
      padding: 40px 0;
      margin-top: 80px;
      font-size: 13px;
      color: var(--text-tertiary);
      text-align: center;
    }

    .footer-links {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 12px;
      margin: 8px 0;
    }

    .footer-links a {
      color: var(--text-secondary);
      text-decoration: none;
      padding: 2px 4px;
      border-radius: 4px;
      transition: color var(--motion-smooth), background-color var(--motion-smooth);
    }

    .footer-links a:hover {
      color: var(--accent-win11);
      background-color: rgba(96, 205, 255, 0.08);
    }

    .footer-sep-dot {
      display: inline-block;
      width: 3px;
      height: 3px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.22);
      flex-shrink: 0;
    }

    .logo-icon-svg {
      width: 28px;
      height: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 6px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(2, 132, 199, 0.35);
      flex-shrink: 0;
    }

    .stat-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      font-size: 11px;
      font-family: var(--font-mono);
      color: var(--text-secondary);
    }

    .community-box {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 36px;
      max-width: 860px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .showcase-download-banner {
      margin-top: 18px;
      background: linear-gradient(135deg, rgba(96, 205, 255, 0.08), rgba(0, 120, 212, 0.12));
      border: 1px solid rgba(96, 205, 255, 0.25);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* 自适应基础类 */
    .logo-text-short {
      display: none;
    }
    .nav-store-text-short {
      display: none;
    }
    .download-card-primary,
    .download-card-roadmap,
    .feature-card,
    .pricing-card,
    .faq-item,
    .community-box {
      min-width: 0;
      max-width: 100%;
      overflow-wrap: break-word;
      word-break: break-word;
    }
    .store-product-meta {
      word-break: break-all;
      overflow-wrap: anywhere;
    }
    .download-benefits-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
      margin: 24px 0;
    }
    .showcase-viewport {
      position: relative;
      background: #181818;
      border-radius: 0 0 10px 10px;
      overflow: hidden;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 520px;
      box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
    }

    /* ==========================================================================
       全设备全景响应式自适应适配系统 (覆盖折叠屏外屏、入门安卓机、X300U、iPad与桌面高分屏)
       ========================================================================== */

    /* 梯度 1：大平板与触控本过渡阶梯 (<= 1024px) */
    @media (max-width: 1024px) {
      .container {
        padding: 0 20px;
      }
      .hero-title {
        font-size: 40px;
      }
      .features-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .community-box {
        grid-template-columns: minmax(0, 1fr);
        padding: 28px;
        gap: 24px;
      }
    }

    /* 梯度 2：主流平板竖屏与窄屏桌面 (<= 900px) */
    @media (max-width: 900px) {
      .nav-links {
        display: none;
      }
      .download-grid,
      .pricing-grid,
      .faq-grid {
        grid-template-columns: minmax(0, 1fr);
      }
      .showcase-viewport {
        min-height: auto;
      }
      .hero-section {
        padding: 60px 0 40px;
      }
      .hero-title {
        font-size: 34px;
      }
    }

    /* 梯度 3：移动端主阶梯 (<= 640px，覆盖主流 iPhone、vivo X300U、入门安卓) */
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
      .header-inner {
        height: 56px;
      }
      .header-actions {
        gap: 8px;
      }
      #current-lang-text {
        display: none;
      }
      .lang-btn {
        padding: 0 8px;
        height: 34px;
      }
      .nav-store-btn {
        padding: 0 12px;
        height: 34px;
        font-size: 12px;
        gap: 6px;
      }
      .nav-store-btn svg {
        width: 16px;
        height: 16px;
      }

      /* 首屏 Hero 区域极速适配 */
      .hero-section {
        padding: 42px 0 32px;
      }
      .badge-pill {
        font-size: 11px;
        padding: 3px 10px;
        margin-bottom: 16px;
        line-height: 1.4;
        white-space: normal;
        max-width: 100%;
        text-align: center;
      }
      .hero-title {
        font-size: clamp(21px, 5.6vw, 32px);
        line-height: 1.25;
        letter-spacing: -0.5px;
        margin: 0 auto 14px;
        text-wrap: balance;
        word-break: keep-all;
      }
      .hero-subtitle {
        font-size: 14px;
        margin-bottom: 22px;
        line-height: 1.5;
        padding: 0 4px;
      }
      .hero-cta-group {
        flex-direction: column;
        width: 100%;
        max-width: 320px;
        margin: 0 auto 18px;
        gap: 10px;
      }
      .hero-cta-group .btn {
        width: 100%;
        height: 46px;
        font-size: 14px;
      }
      .hero-meta {
        gap: 8px;
      }
      .hero-meta-pill {
        padding: 4px 10px;
        font-size: 11px;
      }
      .footer-links {
        gap: 8px 10px;
      }

      /* 微软商店发布专区 */
      .section {
        padding: 50px 0;
      }
      .section-header {
        margin-bottom: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .section-desc {
        font-size: 13px;
      }
      .download-card-primary {
        padding: 22px 16px;
      }
      .download-benefits-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 12px;
        margin: 18px 0;
      }
      .download-card-roadmap {
        padding: 22px 16px;
      }
      .platform-name {
        font-size: 13px;
      }

      /* 四大核心特性 */
      .features-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 14px;
      }
      .feature-card {
        padding: 20px 16px;
        gap: 14px;
      }
      .feature-icon-box {
        width: 44px;
        height: 44px;
      }
      .feature-icon-box svg {
        width: 24px;
        height: 24px;
      }
      .feature-content h3 {
        font-size: 16px;
      }
      .feature-content p {
        font-size: 13px;
      }

      /* 真实截图视窗与下载横幅 */
      .showcase-download-banner {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        padding: 16px;
        gap: 14px;
      }
      .showcase-download-banner .btn {
        width: 100%;
        height: 44px;
        justify-content: center;
      }

      /* 商业订阅与周期选择 */
      .pricing-cycle-bar {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
        margin: 0 auto 24px;
        gap: 6px;
      }
      .cycle-btn {
        width: 100%;
        text-align: center;
        padding: 8px 12px;
      }
      .pricing-card {
        padding: 24px 18px;
      }
      .price-num {
        font-size: 32px;
      }

      /* 交流群与问答 */
      .community-box {
        padding: 20px 16px;
      }
      .faq-item {
        padding: 18px 16px;
      }
      .faq-q {
        font-size: 15px;
      }
      .footer {
        padding: 30px 0;
        margin-top: 50px;
      }
    }

    /* 梯度 4：入门安卓机与紧凑手机阶梯 (<= 480px，覆盖红米/vivo Y/荣耀畅玩/X300U/iPhone 15等) */
    @media (max-width: 480px) {
      .container {
        padding: 0 14px;
      }
      .nav-store-text-full {
        display: none;
      }
      .nav-store-text-short {
        display: inline;
      }
      .nav-store-btn {
        padding: 0 10px;
        height: 34px;
        font-size: 12px;
      }
      .hero-title {
        font-size: clamp(20px, 5.4vw, 26px);
      }
      .download-card-primary,
      .download-card-roadmap,
      .pricing-card {
        padding: 18px 12px;
      }
      .btn-lg {
        padding: 0 14px;
        font-size: 13px;
      }
      .platform-row {
        gap: 8px;
      }
      .platform-name {
        font-size: 12px;
      }
      .status-badge {
        font-size: 11px;
        padding: 2px 6px;
      }
      .download-card-primary div[style*="display: flex; align-items: center; justify-content: space-between"] {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 8px;
      }
    }

    /* 梯度 5：极限窄屏与折叠屏外屏 (<= 340px，覆盖 280px / 320px 超小屏) */
    @media (max-width: 340px) {
      .container {
        padding: 0 8px;
      }
      .header-inner {
        height: 48px;
      }
      .logo-icon-svg {
        width: 22px;
        height: 22px;
      }
      .logo-icon-svg svg {
        width: 22px;
        height: 22px;
      }
      .logo-text-full {
        display: none;
      }
      .logo-text-short {
        display: inline;
        font-size: 13px;
        font-weight: 700;
      }
      .logo-area {
        gap: 6px;
      }
      .header-actions {
        gap: 4px;
      }
      .lang-btn {
        height: 30px;
        padding: 0 5px;
      }
      .nav-store-btn {
        padding: 0 6px;
        height: 30px;
        font-size: 11px;
      }
      .hero-title {
        font-size: 18px;
      }
      .badge-pill {
        font-size: 10px;
        padding: 2px 6px;
      }
      .download-card-primary,
      .download-card-roadmap,
      .pricing-card,
      .feature-card,
      .community-box {
        padding: 14px 10px;
      }
      .btn-lg {
        padding: 0 10px;
        font-size: 12px;
        height: 40px;
      }
      .platform-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
      }
    }