/* ==================== CSS 变量定义 ==================== */
    :root {
      /* 颜色系统 - 清爽医疗蓝紫配色 */
      --primary: #6366f1;
      --primary-dark: #4f46e5;
      --primary-light: #818cf8;
      --primary-glow: rgba(99, 102, 241, 0.3);
      --accent: #8b5cf6;
      --accent-light: #a78bfa;

      /* 背景色 - 清爽渐变 */
      --bg-primary: #f8fafc;
      --bg-secondary: #f1f5f9;
      --bg-tertiary: #e2e8f0;

      /* 玻璃态边框 */
      --glass-border: rgba(99, 102, 241, 0.12);
      --glass-border-hover: rgba(99, 102, 241, 0.25);
      --glass-bg: rgba(255, 255, 255, 0.9);

      /* 文本色 - 更清晰的对比度 */
      --text-primary: #0f172a;
      --text-secondary: #475569;
      --text-muted: #64748b;

      /* 间距 */
      --spacing-xs: 0.25rem;
      --spacing-sm: 0.5rem;
      --spacing-md: 1rem;
      --spacing-lg: 1.5rem;
      --spacing-xl: 3rem;
      --spacing-2xl: 4rem;
      --spacing-3xl: 6rem;
      --spacing-4xl: 8rem;

      /* 圆角 */
      --radius-sm: 0.5rem;
      --radius-md: 0.75rem;
      --radius-lg: 1rem;
      --radius-xl: 1.5rem;
      --radius-2xl: 2rem;

      /* 字体 */
      --font-size-xs: 0.75rem;
      --font-size-sm: 0.875rem;
      --font-size-base: 1rem;
      --font-size-lg: 1.125rem;
      --font-size-xl: 1.25rem;
      --font-size-2xl: 1.5rem;
      --font-size-3xl: 2rem;
      --font-size-4xl: 3rem;
      --font-size-5xl: 4rem;

      /* 动画 */
      --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
      --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

      /* 阴影 */
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
      --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
      --shadow-glow: 0 0 60px var(--primary-glow);

      /* 导航栏高度 */
      --nav-height: 72px;
    }

    /* ==================== 基础样式 ==================== */
    *,
    *::before,
    *::after {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
      -moz-osx-font-smoothing: grayscale;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.6;
      overflow-x: hidden;
      min-height: 100vh;
      position: relative;
    }

    /* 清爽医疗风格渐变背景 */
    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background:
        linear-gradient(135deg,
          #f0f9ff 0%,
          #e0f2fe 25%,
          #dbeafe 50%,
          #e0e7ff 75%,
          #ede9fe 100%
        );
      z-index: -2;
      pointer-events: none;
    }

    body::after {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background:
        radial-gradient(ellipse 60% 50% at 30% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 50% 40% at 80% 70%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse 70% 60% at 50% 90%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
      z-index: -1;
      pointer-events: none;
    }

    /* ==================== 全局细节优化 ==================== */
    /* 选中文本颜色 */
    ::selection {
      background: var(--primary);
      color: white;
    }

    /* GPU加速优化 */
        .hero-preview,
    .phone-preview,
    .feature-card,
    .requirement-card,
    .download-btn {
      will-change: transform;
      transform: translateZ(0);
      backface-visibility: hidden;
    }

    /* 图片优化 */
    img:not(.app-screenshot-item) {
      max-width: 100%;
      height: auto;
      display: block;
    }


    /* ==================== Hero 区域 ==================== */
    .hero {
      padding-top: calc(var(--nav-height) + var(--spacing-3xl));
      padding-bottom: var(--spacing-3xl);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      right: 0;
      width: 60%;
      height: 100%;
      background: radial-gradient(ellipse at 70% 30%, rgba(168, 85, 247, 0.08) 0%, transparent 60%);
      pointer-events: none;
    }

    .container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 var(--spacing-xl);
      position: relative;
      z-index: 1;
      width: 100%;
    }

    .hero-layout {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: var(--spacing-4xl);
      align-items: center;
      min-height: 85vh;
      max-width: 1200px;
      margin: 0 auto;
      padding: var(--spacing-2xl) 0;
    }

    .hero-content {
      text-align: left;
      max-width: 100%;
      padding-right: var(--spacing-xl);
      display: flex;
      flex-direction: column;
      gap: var(--spacing-lg);
      justify-content: center; /* 垂直居中内容 */
    }

    .hero-preview {
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      padding: var(--spacing-lg);
      /* 移除背景和边框，实现纯悬浮感 */
      background: transparent;
      border: none;
      border-radius: 0;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: var(--spacing-sm);
      padding: var(--spacing-sm) var(--spacing-lg);
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: 999px;
      font-size: var(--font-size-sm);
      color: var(--primary);
      font-weight: 600;
      animation: fadeInUp 0.6s ease;
      transition: all var(--transition-normal);
      cursor: default;
      align-self: flex-start;
    }

    .hero-badge:hover {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
      border-color: rgba(99, 102, 241, 0.3);
      transform: translateY(-1px);
    }

    /* ==================== 平台标签切换 ==================== */
    .platform-tabs {
      display: flex;
      gap: 0;
      animation: fadeInUp 0.6s ease 0.35s backwards;
      width: 280px;
      background: rgba(255, 255, 255, 0.95);
      padding: 4px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--glass-border);
      position: relative;
      overflow: hidden;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    }

    .platform-tabs::after {
      content: '';
      position: absolute;
      top: 4px;
      left: 4px;
      width: calc(50% - 4px);
      height: calc(100% - 8px);
      background: linear-gradient(180deg, #2ec76e 0%, #10b050 100%);
      border-radius: var(--radius-md);
      transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      z-index: 1;
      box-shadow: 0 2px 8px rgba(16, 176, 80, 0.25);
    }

    .platform-tabs[data-active="android"]::after {
      transform: translateX(0);
    }

    .platform-tabs[data-active="ios"]::after {
      background: linear-gradient(180deg, #4a80f5 0%, #2060e0 100%);
      box-shadow: 0 2px 8px rgba(32, 96, 224, 0.25);
    }

    .platform-tabs[data-active="ios"]::after {
      transform: translateX(100%);
    }

    .platform-tab {
      padding: var(--spacing-sm) var(--spacing-md);
      background: transparent;
      border: none;
      color: var(--text-secondary);
      font-size: var(--font-size-sm);
      cursor: pointer;
      transition: color 0.2s ease;
      border-radius: var(--radius-md);
      font-weight: 500;
      flex: 1;
      text-align: center;
      position: relative;
      z-index: 2;
    }

    .platform-tab.active {
      color: white;
    }

    .platform-tab:hover:not(.active) {
      color: var(--text-primary);
    }

    /* ==================== 平台内容切换 ==================== */
    .platform-content {
      display: none;
      opacity: 0;
      transition: opacity 0.2s ease;
    }

    .platform-content.active {
      display: block;
      opacity: 1;
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    .hero-title {
      font-size: var(--font-size-5xl);
      font-weight: 700;
      background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.02em;
      line-height: 1.1;
      animation: fadeInUp 0.6s ease 0.1s backwards;
      margin: 0;
    }

    .hero-subtitle {
      font-size: var(--font-size-xl);
      color: var(--text-secondary);
      font-weight: 500;
      line-height: 1.5;
      animation: fadeInUp 0.6s ease 0.2s backwards;
      margin: 0;
    }

    .hero-desc {
      font-size: var(--font-size-base);
      color: var(--text-muted);
      line-height: 1.7;
      animation: fadeInUp 0.6s ease 0.3s backwards;
      max-width: 90%;
      margin: 0;
    }

    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    /* ==================== 现有的大屏媒体查询修正 ==================== */
    /* 平板尺寸 (769px - 1024px) */
    @media (min-width: 769px) and (max-width: 1024px) {
       .hero-layout {
         grid-template-columns: 1fr;
         text-align: center;
       }
       .hero-content {
         padding-right: 0;
         align-items: center;
       }
       .download-buttons {
         justify-content: center;
       }
       .hero-badge {
         align-self: center;
       }
    }

    /* ==================== 下载按钮 ==================== */
    .download-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: var(--spacing-md);
      justify-content: flex-start;
      animation: fadeInUp 0.6s ease 0.4s backwards;
      align-items: center;
    }

    .download-btn {
      display: inline-flex;
      align-items: center;
      gap: 14px;
      padding: 16px 28px;
      border-radius: 14px;
      text-decoration: none;
      font-size: 1rem;
      font-weight: 600;
      letter-spacing: 0.01em;
      width: 260px;
      min-height: 68px;
      justify-content: flex-start;
      border: none;
      cursor: pointer;
      position: relative;
      overflow: hidden;
    }

    .download-btn-android {
      background: linear-gradient(180deg, #2ec76e 0%, #10b050 100%);
      color: white;
      box-shadow: 0 3px 14px rgba(16, 176, 80, 0.3);
    }

    .download-btn-android:active {
      transform: translateY(0);
      box-shadow: 0 2px 8px rgba(16, 176, 80, 0.2);
    }

    .download-btn-android:focus-visible {
      outline: 2px solid #10b050;
      outline-offset: 3px;
    }

    .download-btn-ios {
      background: linear-gradient(180deg, #4a80f5 0%, #2060e0 100%);
      color: white;
      box-shadow: 0 3px 14px rgba(32, 96, 224, 0.3);
    }

    .download-btn-ios:active {
      transform: translateY(0);
      box-shadow: 0 2px 8px rgba(32, 96, 224, 0.2);
    }

    .download-btn-ios:focus-visible {
      outline: 2px solid #2060e0;
      outline-offset: 3px;
    }

    .download-btn-icon {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(255, 255, 255, 0.2);
      border-radius: 10px;
      flex-shrink: 0;
      backdrop-filter: blur(2px);
    }

    .download-btn-icon svg {
      width: 24px;
      height: 24px;
      color: #fff;
    }

    .download-btn-text {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      flex: 1;
      text-align: center;
    }

    .download-btn-platform {
      font-size: 1.05rem;
      font-weight: 700;
      letter-spacing: 0.03em;
      line-height: 1.3;
      color: #fff;
    }

    .download-btn-subtitle {
      font-size: 0.75rem;
      font-weight: 400;
      letter-spacing: 0.02em;
      line-height: 1.2;
      color: #fff;
    }

    .download-hint {
      color: var(--text-muted);
      font-size: var(--font-size-xs);
      margin-bottom: 0;
      animation: fadeInUp 0.6s ease 0.5s backwards;
      text-align: left;
    }

    /* ==================== 二维码区域 ==================== */
    .qr-code-box {
      display: inline-block;
      padding: var(--spacing-sm);
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      animation: fadeInUp 0.6s ease 0.6s backwards;
      transition: all 0.3s ease;
      vertical-align: top;
      margin-left: var(--spacing-sm);
      position: relative;
      overflow: hidden;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
    }

    .qr-code-box::before {
      display: none;
    }

    .qr-code-box:hover {
      border-color: var(--glass-border-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    }

    .qr-code-box:hover::before {
      display: none;
    }

    .qr-code-placeholder {
      width: 140px;
      height: 140px;
      padding: 10px;
      background: white;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: var(--font-size-sm);
      color: #666;
      font-weight: 500;
      position: relative;
      overflow: hidden;
    }

    .qr-loading {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      color: #999;
      font-size: 12px;
      text-align: center;
      z-index: 1;
    }

    .qr-loading::after {
      content: '';
      display: block;
      width: 20px;
      height: 20px;
      margin: 8px auto 0;
      border: 2px solid #ddd;
      border-top-color: #8b5cf6;
      border-radius: 50%;
      animation: qr-spin 0.8s linear infinite;
    }

    @keyframes qr-spin {
      to { transform: rotate(360deg); }
    }

    /* ==================== 手机预览图 - iPhone 17 Pro 风格 ==================== */
    .phone-preview {
      position: relative;
      width: 100%;
      max-width: 280px;
      animation: fadeInRight 0.8s ease 0.3s backwards;
      transition: transform var(--transition-slow);
      margin: 0 auto;
    }

    .phone-preview:hover {
      transform: translateY(-6px);
    }

    @keyframes fadeInRight {
      from { opacity: 0; transform: translateX(40px); }
      to   { opacity: 1; transform: translateX(0); }
    }

    /* 钛金属机身 */
    .phone-mockup-main {
      position: relative;
      width: 100%;
      padding: 10px;
      background: linear-gradient(160deg, #3a3a3c 0%, #2c2c2e 10%, #1c1c1e 50%, #2c2c2e 90%, #3a3a3c 100%);
      border-radius: 48px;
      box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.35),
        0 8px 24px rgba(0, 0, 0, 0.25),
        inset 0 0 0 1px rgba(255, 255, 255, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.04);
      transition: all var(--transition-normal);
    }

    /* 侧边按钮 */
    .phone-mockup-main::before {
      content: '';
      position: absolute;
      right: -2px;
      top: 120px;
      width: 2px;
      height: 60px;
      background: linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.06));
      border-radius: 0 1px 1px 0;
      z-index: 0;
      pointer-events: none;
    }

    /* 左侧音量键 */
    .phone-mockup-main::after {
      content: '';
      position: absolute;
      left: -2px;
      top: 110px;
      width: 2px;
      height: 28px;
      background: rgba(255,255,255,0.1);
      border-radius: 1px 0 0 1px;
      z-index: 0;
      pointer-events: none;
      box-shadow: 0 36px 0 rgba(255,255,255,0.1), 0 72px 0 rgba(255,255,255,0.1);
    }

    .phone-mockup-main:hover {
      box-shadow:
        0 36px 88px rgba(0, 0, 0, 0.4),
        0 10px 28px rgba(0, 0, 0, 0.3);
      transform: translateY(-4px);
    }

    /* Dynamic Island */
    .phone-screen {
      background: #000;
      border-radius: 38px;
      overflow: hidden;
      aspect-ratio: 9 / 19.5;
      position: relative;
      box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
      width: 100%;
    }

    .phone-screen::before {
      content: '';
      position: absolute;
      top: 8px;
      left: 50%;
      transform: translateX(-50%);
      width: 88px;
      height: 26px;
      background: #000;
      border-radius: 14px;
      z-index: 10;
      pointer-events: none;
      box-shadow: 0 0 0 1px rgba(255,255,255,0.08);
    }

    /* 底部 Home Indicator */
    .phone-screen::after {
      content: '';
      position: absolute;
      bottom: 6px;
      left: 50%;
      transform: translateX(-50%);
      width: 100px;
      height: 4px;
      background: rgba(255,255,255,0.3);
      border-radius: 3px;
      z-index: 10;
      pointer-events: none;
    }

    /* ==================== 动态图片展示 ==================== */
    .app-screenshots {
      position: absolute;
      inset: 0;
      overflow: hidden;
      border-radius: inherit;
      background: #000;
    }

    /* 加载占位 */
    .loading-placeholder {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 16px;
      background: #000;
      color: #888;
      font-size: 14px;
    }

    .loading-spinner {
      width: 32px;
      height: 32px;
      border: 3px solid rgba(255, 255, 255, 0.15);
      border-top-color: rgba(255, 255, 255, 0.6);
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }

    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    .app-screenshot-item {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      max-width: none;
      opacity: 0;
      transition: opacity 0.5s ease;
      object-fit: cover;
      object-position: top center;
      background: #000;
    }

    .app-screenshot-item.active {
      opacity: 1;
      z-index: 1;
    }

    .app-screenshot-item.fade-in {
      animation: fadeInScreenshot 0.5s ease;
    }

    @keyframes fadeInScreenshot {
      from {
        opacity: 0;
        transform: scale(1.03);
      }
      to {
        opacity: 1;
        transform: scale(1);
      }
    }

    /* 图片切换指示器 */
    .screenshot-indicators {
      position: absolute;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      align-items: center;
      gap: 10px;
      z-index: 10;
      padding: 6px 16px;
      background: rgba(0, 0, 0, 0.35);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 20px;
      opacity: 0;
      transition: opacity 0.3s ease;
      pointer-events: none;
    }

    .phone-mockup-main:hover .screenshot-indicators {
      opacity: 1;
      pointer-events: auto;
    }

    @media (hover: none) {
      .screenshot-indicators {
        opacity: 1;
        pointer-events: auto;
      }
    }

    @media (max-width: 768px) {
      .screenshot-indicators {
        bottom: 18px;
        gap: 8px;
        padding: 5px 14px;
      }
    }

    @media (max-width: 480px) {
      .screenshot-indicators {
        bottom: 14px;
        gap: 6px;
        padding: 4px 12px;
      }
    }

    .screenshot-indicator {
      width: 8px;
      height: 8px;
      border-radius: 4px;
      background: rgba(255, 255, 255, 0.35);
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .screenshot-indicator.active {
      width: 24px;
      background: #fff;
      border-radius: 4px;
    }

    .screenshot-indicator:hover {
      background: rgba(255, 255, 255, 0.7);
    }

    /* ==================== 功能特性区域 ==================== */
    .features-section {
      padding: var(--spacing-3xl) 0;
      background: transparent; /* 改为透明，打通全局背景 */
      position: relative;
    }

    .section-title {
      text-align: center;
      font-size: var(--font-size-3xl);
      font-weight: 600;
      margin-bottom: var(--spacing-2xl);
      color: var(--text-primary);
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: var(--spacing-lg);
      max-width: 1200px;
      margin: 0 auto;
    }

    /* ==================== 系统要求区域 ==================== */
    .requirements-section {
      padding: var(--spacing-3xl) 0 var(--spacing-4xl);
      background: transparent;
    }

    .requirements-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: var(--spacing-xl);
      max-width: 1000px;
      margin: var(--spacing-2xl) auto 0;
      justify-content: center;
    }

    .feature-card {
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-xl);
      padding: var(--spacing-2xl);
      transition: all var(--transition-normal);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    }

    .feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--glass-border-hover);
      box-shadow: 0 12px 40px rgba(99, 102, 241, 0.12);
      background: rgba(255, 255, 255, 0.98);
    }

    .feature-icon {
      font-size: 2.5rem;
      margin-bottom: var(--spacing-lg);
      line-height: 1;
      transition: transform var(--transition-normal);
    }

    .feature-card:hover .feature-icon {
      transform: scale(1.1);
    }

    .requirement-card {
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-xl);
      padding: var(--spacing-2xl);
      transition: all var(--transition-normal);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    }

    .requirement-card:hover {
      transform: translateY(-4px);
      border-color: var(--glass-border-hover);
      box-shadow: 0 12px 40px rgba(99, 102, 241, 0.12);
      background: rgba(255, 255, 255, 0.98);
    }

    .requirement-platform {
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: var(--spacing-md);
      height: 48px;
    }

    .requirement-platform svg {
      transition: transform var(--transition-normal);
    }

    .requirement-card:hover .requirement-platform svg {
      transform: scale(1.05);
    }

    .requirement-title {
      font-size: var(--font-size-xl);
      font-weight: 600;
      margin-bottom: var(--spacing-lg);
      color: var(--text-primary);
    }

    .requirement-list {
      list-style: none;
    }

    .requirement-item {
      padding: var(--spacing-sm) 0;
      color: var(--text-secondary);
      font-size: var(--font-size-base);
      display: flex;
      align-items: flex-start;
      gap: var(--spacing-sm);
    }

    .requirement-item::before {
      content: '✓';
      color: var(--primary);
      font-weight: 700;
      flex-shrink: 0;
    }


    /* ==================== 响应式设计 - 平板 ==================== */
    @media (max-width: 1024px) {
      :root {
        --nav-height: 64px;
        --spacing-4xl: 3rem;
      }

      .nav-container {
        padding: 0 var(--spacing-xl); /* 平板端：48px */
      }

      /* 注意：移动端样式在下面的独立 @media (max-width: 768px) 块中定义 */

      .nav-links {
        gap: var(--spacing-lg);
      }

      .hero {
        padding-top: calc(var(--nav-height) + var(--spacing-3xl));
        padding-bottom: var(--spacing-3xl);
      }

      .hero-layout {
        grid-template-columns: 1fr 0.9fr;
        gap: var(--spacing-3xl);
        padding: var(--spacing-xl) 0;
      }

      .hero-content {
        padding-right: var(--spacing-lg);
      }

      .hero-title {
        font-size: var(--font-size-4xl);
      }

      .hero-subtitle {
        font-size: var(--font-size-lg);
      }

      .phone-preview {
        max-width: 240px;
      }

      .section-title {
        font-size: var(--font-size-3xl);
      }

      .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-xl);
      }
    }

    /* ==================== 响应式设计 - 手机 ==================== */
    @media (max-width: 768px) {
      /* ===== 移动端性能优化 ===== */
      :root {
        --nav-height: 56px;
        --spacing-3xl: 2rem;
        --spacing-4xl: 2.5rem;
        --safe-area-inset-top: env(safe-area-inset-top, 0px);
        --safe-area-inset-right: env(safe-area-inset-right, 0px);
        --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
        --safe-area-inset-left: env(safe-area-inset-left, 0px);
        /* 减少动画时长，提升响应速度 */
        --transition-fast: 0.1s ease;
        --transition-normal: 0.2s ease;
      }

      /* 禁用复杂背景效果 - 大幅提升性能 */
      body::before,
      body::after {
        display: none !important;
      }

      /* 禁用所有will-change，减少内存占用 */
            .hero-preview,
      .phone-preview,
      .feature-card,
      .requirement-card,
      .download-btn {
        will-change: auto;
        transform: none;
        backface-visibility: visible;
      }

      .container {
        padding-left: max(16px, var(--safe-area-inset-left));
        padding-right: max(16px, var(--safe-area-inset-right));
      }


      /* ===== 触摸优化 ===== */
      * {
        -webkit-tap-highlight-color: transparent;
      }

      a, button, .btn, .nav-link, .platform-tab, .download-btn {
        touch-action: manipulation;
        cursor: pointer;
      }

      /* ===== Hero区域 - 移动端专属布局 ===== */
      .hero {
        padding-top: calc(var(--nav-height) + 24px);
        padding-bottom: 32px;
        min-height: auto;
      }

      .hero::before {
        display: none; /* 移除额外背景效果 */
      }

      .hero-layout {
        display: flex;
        flex-direction: column;
        gap: 24px;
        padding: 0;
      }

      .hero-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 12px;
        padding: 0 20px;
        width: 100%;
      }

      /* 移动端元素顺序优化 - 所有元素居中 */
      .hero-badge { order: 1; }
      .hero-title { order: 2; margin-top: 4px; }
      .hero-subtitle { order: 3; margin-bottom: 4px; }
      .platform-tabs { order: 4; }
      .platform-content { order: 5; }
      .hero-desc { order: 6; display: none; }
      .hero-preview { order: 7; }

      .hero-badge {
        padding: 6px 14px;
        font-size: 0.8rem;
      }

      .hero-title {
        font-size: clamp(1.75rem, 7vw, 2.25rem);
        line-height: 1.15;
        margin: 0;
      }

      .hero-subtitle {
        font-size: 1rem;
        line-height: 1.5;
        color: var(--text-secondary);
        margin: 0;
        max-width: 90%;
      }

      /* ===== 平台切换 - 移动端优化 ===== */
      .platform-tabs {
        width: auto;
        max-width: none;
        margin: 12px 0;
        padding: 4px;
        background: var(--bg-secondary);
        border: 1px solid var(--glass-border);
        border-radius: 14px;
        display: inline-flex;
      }

      .platform-tab {
        padding: 10px 24px;
        font-size: 0.875rem;
        font-weight: 600;
        border-radius: 10px;
        white-space: nowrap;
      }

      .platform-tab.active {
        background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
        color: white;
      }

      .platform-tab:active {
        transform: scale(0.97);
      }

      /* ===== 下载按钮 - 移动端居中设计 ===== */
      .platform-content {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: center;
      }

      .platform-content.active {
        display: flex;
      }

      .download-buttons {
        flex-direction: column;
        gap: 12px;
        width: 100%;
        max-width: 300px;
        margin: 16px 0;
        padding: 0;
        align-items: center;
      }

      .download-btn {
        width: 100%;
        min-height: 60px;
        padding: 14px 24px;
        border-radius: 14px;
        justify-content: center;
        font-size: 1rem;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
        gap: 14px;
      }

      .download-btn:active {
        transform: scale(0.97);
        transition: transform 0.1s ease;
      }

      .download-btn-icon {
        width: 40px;
        height: 40px;
        background: rgba(255, 255, 255, 0.15);
        border-radius: 10px;
        flex-shrink: 0;
      }

      .download-btn-icon svg {
        width: 24px;
        height: 24px;
      }

      /* 移动端：文字不要flex:1，保持居中 */
      .download-btn-text {
        flex: none;
        align-items: flex-start;
        text-align: left;
      }

      .download-btn-platform {
        font-size: 1rem;
        font-weight: 600;
      }

      .download-btn-subtitle {
        font-size: 0.75rem;
        color: #fff;
      }

      /* 隐藏二维码和提示 */
      .download-hint,
      .qr-code-box {
        display: none !important;
      }

      /* ===== 手机预览 - 移动端优化 ===== */
      .hero-preview {
        width: 100%;
        padding: 16px 0;
        display: flex;
        justify-content: center;
      }

      .phone-preview {
        max-width: 200px;
        margin: 0;
      }

      .phone-preview:hover {
        transform: none;
      }

      .phone-mockup-main {
        padding: 6px;
        border-radius: 36px;
        box-shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
      }

      .phone-mockup-main::before,
      .phone-mockup-main::after {
        display: none;
      }

      .phone-screen {
        border-radius: 28px;
      }

      .phone-screen::before {
        top: 6px;
        width: 60px;
        height: 20px;
        border-radius: 10px;
      }

      .phone-screen::after {
        bottom: 5px;
        width: 70px;
        height: 3px;
      }

      .app-screenshots {
        min-height: 320px;
      }

      .screenshot-indicators {
        bottom: 8px;
        gap: 4px;
        padding: 4px 6px;
        background: rgba(0, 0, 0, 0.25);
        border-radius: 12px;
      }

      .screenshot-indicator {
        width: 4px;
        height: 4px;
      }

      .screenshot-indicator.active {
        width: 12px;
        border-radius: 2px;
      }

      /* ===== 功能特性 - 简化布局 ===== */
      .features-section,
      .requirements-section {
        padding: 32px 0;
      }

      .section-title {
        font-size: 1.25rem;
        margin-bottom: 20px;
      }

      .features-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 12px;
      }

      .feature-card {
        padding: 16px;
        border-radius: 12px;
        display: flex;
        align-items: center;
        gap: 12px;
        /* 禁用hover效果 */
        transition: none;
      }

      .feature-card:hover {
        transform: none;
        box-shadow: none;
      }

      .feature-icon {
        font-size: 1.75rem;
        flex-shrink: 0;
        margin-bottom: 0;
      }

      .feature-card .feature-content {
        flex: 1;
      }

      .feature-title {
        font-size: 1rem;
        margin-bottom: 6px;
      }

      .feature-desc {
        font-size: 0.875rem;
        line-height: 1.5;
        color: var(--text-secondary);
      }

      /* 移动端卡片触摸反馈 */
      .feature-card:active,
      .requirement-card:active {
        transform: scale(0.99);
        transition: transform 0.1s ease;
      }

      /* ===== 系统要求 - 移动端优化 ===== */
      .requirements-grid {
        grid-template-columns: 1fr;
        gap: 16px;
      }

      .requirement-card {
        padding: 20px;
        border-radius: 16px;
      }

      .requirement-platform {
        height: 40px;
        margin-bottom: 12px;
      }

      .requirement-platform svg {
        width: 36px;
        height: 36px;
      }

      .requirement-title {
        font-size: 1.1rem;
        margin-bottom: 12px;
      }

      .requirement-item {
        font-size: 0.875rem;
        padding: 6px 0;
      }

    }

    /* ==================== 响应式设计 - 小手机 ==================== */
    @media (max-width: 480px) {
      .hero-content {
        padding: 0 16px;
      }

      .nav-logo-img {
        width: 32px;
        height: 32px;
      }

      .nav-logo {
        font-size: 0.9rem;
        gap: 6px;
      }

      .hero {
        padding-top: calc(var(--nav-height) + 16px);
      }

      .hero-title {
        font-size: 1.5rem;
      }

      .hero-subtitle {
        font-size: 0.875rem;
      }

      .platform-tab {
        padding: 8px 20px;
        font-size: 0.8rem;
      }

      .download-buttons {
        max-width: 280px;
      }

      .download-btn {
        min-height: 54px;
        padding: 12px 16px;
        border-radius: 12px;
      }

      .download-btn-icon {
        width: 36px;
        height: 36px;
      }

      .download-btn-platform {
        font-size: 0.95rem;
      }

      .phone-preview {
        max-width: 180px;
      }

      .phone-mockup-main {
        padding: 5px;
        border-radius: 32px;
        box-shadow: 0 14px 36px rgba(0, 0, 0, 0.3);
      }

      .phone-mockup-main::before,
      .phone-mockup-main::after {
        display: none;
      }

      .phone-screen {
        border-radius: 24px;
      }

      .phone-screen::before {
        top: 5px;
        width: 50px;
        height: 17px;
        border-radius: 9px;
      }

      .phone-screen::after {
        bottom: 4px;
        width: 56px;
        height: 3px;
      }

      .app-screenshots {
        min-height: 260px;
      }

      .section-title {
        font-size: 1.25rem;
      }

      .feature-card,
      .requirement-card {
        padding: 16px;
      }

      .feature-icon {
        font-size: 1.5rem;
      }
    }

    /* ==================== 响应式设计 - 极小手机 ==================== */
    @media (max-width: 360px) {
      .nav-logo span {
        display: none;
      }

      .hero-title {
        font-size: 1.25rem;
      }

      .platform-tabs {
        max-width: 100%;
      }

      .platform-tab {
        padding: 8px 14px;
        font-size: 0.8rem;
      }

      .download-buttons {
        max-width: 260px;
      }

      .download-btn {
        min-height: 50px;
        padding: 10px 14px;
      }

      .download-btn-icon {
        width: 32px;
        height: 32px;
      }

      .download-btn-platform {
        font-size: 0.9rem;
      }

      .download-btn-subtitle {
        font-size: 0.7rem;
      }

      .phone-preview {
        max-width: 160px;
      }

      .phone-mockup-main {
        padding: 4px;
        border-radius: 28px;
      }

      .phone-screen {
        border-radius: 22px;
      }

      .phone-screen::before {
        top: 4px;
        width: 44px;
        height: 15px;
        border-radius: 8px;
      }

      .phone-screen::after {
        bottom: 3px;
        width: 48px;
        height: 2px;
      }

      .app-screenshots {
        min-height: 240px;
      }

      .phone-mockup-main {
        padding: 8px;
        border-radius: 20px;
      }
    }

    /* ==================== 触摸设备优化 ==================== */
    @media (hover: none) and (pointer: coarse) {
      /* 禁用hover效果，优化触摸体验 */
      .feature-card:hover,
      .requirement-card:hover {
        transform: none;
        box-shadow: none;
      }

      /* 触摸反馈 */
      .download-btn:active,
      .platform-tab:active,
      .feature-card:active,
      .requirement-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
      }

      .platform-tab:active {
        transform: scale(0.96);
        opacity: 0.8;
      }

      /* 触摸设备上的nav-link样式，但移动端(max-width: 768px)会被上面的样式覆盖 */
      .nav-link {
        padding: var(--spacing-md);
        min-height: 44px;
        display: flex;
        align-items: center;
      }

      .nav-link:active {
        opacity: 0.7;
      }

      /* 移动端优先：确保移动端的nav-link样式优先级最高 */
      @media (max-width: 768px) {
        .nav-link {
          padding: 0 !important; /* 移动端移除padding，确保与官网汉堡按钮一致 */
          margin: 0 !important;
          display: inline-flex !important;
        }
      }

      .feature-card:active,
      .requirement-card:active {
        transform: scale(0.98);
      }

      /* 优化滚动性能 */
      .hero,
      .features-section,
      .requirements-section {
        -webkit-overflow-scrolling: touch;
      }
    }

    /* ==================== 低端设备优化 - 纯色不透明 ==================== */
    .low-end-device {
      /* 禁用所有动画和过渡 */
      --transition-fast: 0s !important;
      --transition-normal: 0s !important;
    }

    .low-end-device *,
    .low-end-device *::before,
    .low-end-device *::after {
      animation: none !important;
      transition: none !important;
    }


    /* 低端设备：禁用复杂背景 */
    .low-end-device body::before,
    .low-end-device body::after,
    .low-end-device .hero::before {
      display: none !important;
    }

    /* 低端设备：简化卡片样式 */
    .low-end-device .feature-card,
    .low-end-device .requirement-card {
      box-shadow: none;
      border: 1px solid var(--glass-border);
    }

    .low-end-device .phone-mockup-main {
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    }

    .low-end-device .download-btn {
      box-shadow: none !important;
    }

    .low-end-device .hero-badge {
      background: rgba(168, 85, 247, 0.3) !important;
      border-color: rgba(168, 85, 247, 0.5) !important;
    }


    /* ==================== 打印样式 ==================== */
    @media print {
            .download-buttons {
        display: none;
      }

      body {
        background: white;
        color: black;
      }
    }

    /* ==================== 无障碍支持 ==================== */
    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }

    /* ==================== 性能优化：contain属性 ==================== */
    .feature-card,
    .requirement-card {
      contain: layout style;
    }

    /* ==================== 深色模式支持 ==================== */
    @media (prefers-color-scheme: dark) {
      /* 已经是深色模式，无需额外处理 */
    }

    /* ==================== 微信提示样式 ==================== */
    #wechat-tip-overlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0, 0, 0, 0.96);
      z-index: 10002 !important;
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 20px;
      backdrop-filter: blur(20px) saturate(150%);
      -webkit-backdrop-filter: blur(20px) saturate(150%);
      overflow-y: auto;
      -webkit-overflow-scrolling: touch;
    }

    @keyframes arrowBounce {
      0%, 100% {
        transform: translateY(0) scale(1);
        opacity: 1;
      }
      50% {
        transform: translateY(-8px) scale(1.05);
        opacity: 0.9;
      }
    }

    @keyframes arrowGlow {
      0%, 100% {
        filter: drop-shadow(0 0 8px rgba(255, 68, 68, 0.8))
                drop-shadow(0 0 16px rgba(255, 68, 68, 0.5));
      }
      50% {
        filter: drop-shadow(0 0 12px rgba(255, 68, 68, 1))
                drop-shadow(0 0 24px rgba(255, 68, 68, 0.7));
      }
    }

    @keyframes pulseGlow {
      0%, 100% {
        opacity: 1;
        box-shadow: 0 0 20px rgba(255, 107, 107, 0.6),
                    0 0 40px rgba(255, 107, 107, 0.3);
      }
      50% {
        opacity: 0.9;
        box-shadow: 0 0 30px rgba(255, 107, 107, 0.8),
                    0 0 60px rgba(255, 107, 107, 0.4);
      }
    }

    .wechat-arrow-container {
      position: absolute;
      top: 10px;
      right: 10px;
      animation: arrowGlow 2s ease-in-out infinite;
    }

    .wechat-arrow-shape {
      position: relative;
      animation: arrowBounce 1.5s ease-in-out infinite;
    }

    .wechat-glow-box {
      animation: pulseGlow 2.5s ease-in-out infinite;
      background: linear-gradient(135deg, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0.08) 100%);
      border-radius: 20px;
      padding: 32px 28px;
      margin: 32px 0;
      border: 2px solid rgba(255, 255, 255, 0.25);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    }

    .wechat-content {
      animation: fadeInUp 0.6s ease-out forwards;
      margin-top: 140px;
      text-align: center;
      color: white;
      max-width: 520px;
      width: 100%;
    }

    .wechat-menu-icon {
      position: absolute;
      top: 5px;
      right: 5px;
      background: rgba(255, 68, 68, 0.2);
      border: 2px solid #ff4444;
      border-radius: 8px;
      padding: 8px 12px;
      backdrop-filter: blur(10px);
    }

    .wechat-menu-icon-dot {
      color: #fff;
      font-size: 32px;
      font-weight: bold;
      line-height: 1;
      text-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    }

    .wechat-tip-text {
      position: absolute;
      top: 60px;
      right: -10px;
      background: #ff4444;
      color: white;
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: bold;
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(255, 68, 68, 0.5);
    }

    .wechat-content .main-title {
      font-size: 28px;
      font-weight: bold;
      margin-bottom: 24px;
      color: #ff6b6b;
      text-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
    }

    .wechat-content .section-title {
      font-size: 19px;
      margin-bottom: 24px;
      line-height: 1.6;
      color: #fff;
      text-align: center;
    }

    .wechat-content .step-list {
      text-align: left;
      font-size: 17px;
      line-height: 2.2;
      margin-top: 20px;
    }

    .step-card {
      margin-bottom: 18px;
      display: flex;
      align-items: start;
      background: rgba(255, 255, 255, 0.05);
      padding: 12px 16px;
      border-radius: 12px;

    }

    .step-card:last-child {
      margin-bottom: 0;
    }

    .step-number {
      color: #ff6b6b;
      font-weight: bold;
      margin-right: 14px;
      min-width: 32px;
      font-size: 18px;
    }

    .step-card strong {
        color: #ffd93d;
        font-size: inherit;
    }

    .step-card span span {
        font-size: 15px;
        color: #a1a1aa;
    }

    /* 微信提示响应式优化 */
    @media (max-width: 768px) {
      .wechat-content {
        margin-top: 140px !important;
        padding: 0 20px;
        max-width: 95% !important;
      }

      .wechat-arrow-container {
        top: 8px;
        right: 8px;
        transform: scale(0.9);
      }
    }

    @media (max-width: 480px) {
      .wechat-content {
        margin-top: 120px !important;
        padding: 0 16px;
      }

      .wechat-arrow-container {
        top: 6px;
        right: 6px;
        transform: scale(0.75);
      }

      .wechat-glow-box {
        padding: 24px 20px !important;
        margin: 24px 0 !important;
      }

      .step-card {
        padding: 10px 12px !important;
        margin-bottom: 14px !important;
        font-size: 15px !important;
      }

      .step-number {
        font-size: 16px !important;
        min-width: 28px !important;
        margin-right: 10px !important;
      }

      .main-title {
        font-size: 24px !important;
      }
    }

    @media (max-width: 380px) {
      .wechat-content {
        margin-top: 100px !important;
        padding: 0 12px;
      }

      .wechat-arrow-container {
        transform: scale(0.65);
      }

      .wechat-glow-box {
        padding: 20px 16px !important;
        margin: 20px 0 !important;
      }

      .step-card {
        padding: 8px 10px !important;
        font-size: 14px !important;
      }

      .main-title {
        font-size: 22px !important;
      }
    }

    @media (max-height: 700px) {
      .wechat-content {
        margin-top: 100px !important;
      }
    }

    @media (max-height: 600px) {
      .wechat-content {
        margin-top: 80px !important;
      }

      .wechat-arrow-container {
        transform: scale(0.7);
      }
    }

    @media (max-height: 500px) {
      .wechat-content {
        margin-top: 60px !important;
      }
    }
    /* 移动端布局优化 */
    @media (max-width: 768px) {
      .hero {
        padding-top: calc(var(--nav-height) + 1.5rem);
      }

      .hero-content,
      .download-content,
      .hero-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
      }

      .download-buttons,
      .download-actions {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: 0.75rem !important;
      }

      .download-btn-android,
      .download-btn-ios {
        width: 100%;
        justify-content: center;
      }
    }