/* --- 1. 全局设计变量与基础重置 --- */
    :root {
      --primary-color: #d62846;       /* 温暖亲切的玫瑰红 */
      --primary-hover: #b51d36;
      --text-dark: #1e293b;           /* 高对比度深色字，防视疲劳 */
      --text-medium: #334155;
      --text-muted: #475569;
      --bg-light: #f8fafc;
      --navbar-height: 80px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-dark);
      background-color: #ffffff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

    img {
      max-width: 100%;
      height: auto;
    }

    /* --- 2. 导航栏（完美适配移动端） --- */
    .navbar {
      height: var(--navbar-height);
      display: flex;
      align-items: center;
      background: #ffffff;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
    }

    .navbar-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: clamp(1.2rem, 4vw, 1.6rem);
      font-weight: 900;
      color: var(--primary-color);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo svg {
      fill: var(--primary-color);
      width: clamp(24px, 5vw, 28px);
      height: clamp(24px, 5vw, 28px);
    }

    .nav-btn {
      background: var(--primary-color);
      color: #ffffff;
      padding: 10px 20px;
      border-radius: 50px;
      font-weight: 700;
      font-size: clamp(0.85rem, 3vw, 1rem);
      transition: var(--transition);
      white-space: nowrap; /* 坚决防止文字换行折叠 */
    }

    .nav-btn:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    /* --- 3. 👑 50+ 极致护眼与温暖情感 Banner 区域 --- */
    .hero-section {
      position: relative;
      padding-top: calc(var(--navbar-height) + 60px);
      padding-bottom: 80px;
      background: radial-gradient(circle at top right, #fff5f6 0%, #ffffff 70%);
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr; /* 黄金比例：左侧文字，右侧情感卡片 */
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      max-width: 650px;
      position: relative;
      z-index: 2;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 20px;
      background: #fff5f6;
      border: 2px solid rgba(214, 40, 70, 0.25);
      color: var(--primary-color);
      border-radius: 50px;
      font-weight: 800;
      font-size: 0.95rem;
      margin-bottom: 24px;
      box-shadow: 0 4px 10px rgba(214, 40, 70, 0.05);
    }

    .hero-title {
      font-size: clamp(2.2rem, 4.5vw, 3.6rem); /* 强化标题字号，确保清晰可见 */
      line-height: 1.25;
      font-weight: 900;
      letter-spacing: -1px;
      color: var(--text-dark);
      margin-bottom: 20px;
    }

    .hero-title span {
      color: var(--primary-color);
      position: relative;
      display: inline-block;
    }

    /* 温暖的手绘风文字下划线 */
    .hero-title span::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 2px;
      width: 100%;
      height: 6px;
      background: rgba(214, 40, 70, 0.15);
      border-radius: 4px;
      z-index: -1;
    }

    .hero-subtitle {
      font-size: clamp(1.25rem, 2.5vw, 1.6rem);
      color: var(--text-medium);
      font-weight: 800;
      margin-bottom: 24px;
    }

    .hero-text {
      color: var(--text-muted);
      font-size: 1.2rem; /* 大字号，降低老花眼阅读疲劳 */
      line-height: 1.8;
      margin-bottom: 40px;
    }

    /* 📱 下载按钮排版：完美解决移动端挤压问题 */
    .download-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .app-btn {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: #111827; /* 深色高对比按钮 */
      color: #ffffff;
      padding: 12px 24px;
      border-radius: 16px;
      transition: var(--transition);
      border: 2px solid transparent;
      box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
      flex: 1; /* 移动端平分宽度 */
      min-width: 200px; /* 防止缩得太小 */
      justify-content: center;
    }

    .app-btn:hover {
      background: #1f2937;
      transform: translateY(-2px);
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
    }

    .app-btn svg {
      fill: currentColor;
      flex-shrink: 0;
      width: 24px;
      height: 24px;
    }

    .app-btn-text {
      display: flex;
      flex-direction: column;
      text-align: left;
    }

    .app-btn-text .top-text {
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      opacity: 0.8;
    }

    .app-btn-text .main-text {
      font-size: 1.1rem;
      font-weight: 700;
      white-space: nowrap;
    }

    /* 右侧：极具信赖感的“实体感”相框设计 */
    .hero-visual-wrapper {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 1;
    }

    .hero-photo-card {
      position: relative;
      background: #ffffff;
      padding: 16px;
      border-radius: 24px;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
      border: 1px solid rgba(0, 0, 0, 0.04);
      transform: rotate(1.5deg); /* 微微倾斜 */
      transition: var(--transition);
      max-width: 440px;
      width: 100%;
    }

    .hero-photo-card:hover {
      transform: rotate(0deg) scale(1.02);
    }

    .hero-photo-card img {
      width: 100%;
      height: auto;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      border-radius: 16px;
      display: block;
      filter: contrast(1.02) saturate(1.05);
    }

    .photo-caption {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: 16px;
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--text-medium);
      text-align: center;
    }

    .photo-caption svg {
      color: var(--primary-color);
      flex-shrink: 0;
    }

    /* --- 4. 优势介绍板块 --- */
    .features-section {
      padding: 80px 0;
      background-color: var(--bg-light);
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 56px auto;
    }

    .section-title {
      font-size: clamp(2rem, 3.5vw, 2.6rem);
      font-weight: 900;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 32px;
    }

    .feature-card {
      background: #ffffff;
      padding: 40px 32px;
      border-radius: 24px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
      border: 1px solid rgba(0, 0, 0, 0.02);
      transition: var(--transition);
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 15px 40px rgba(0, 0, 0, 0.06);
    }

    .feature-icon-wrapper {
      width: 64px;
      height: 64px;
      border-radius: 16px;
      background: #fff5f6;
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
    }

    .feature-card h3 {
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-dark);
    }

    .feature-card p {
      font-size: 1.1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* --- 5. 真实故事与口碑板块 --- */
    .stories-section {
      padding: 80px 0;
      background: #ffffff;
    }

    .stories-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 32px;
    }

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

    .story-quote {
      font-size: 1.1rem;
      color: var(--text-medium);
      line-height: 1.7;
      font-style: italic;
      margin-bottom: 24px;
    }

    .story-user {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .story-avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      object-fit: cover;
      border: 3px solid #ffffff;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }

    .story-user-info h4 {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--text-dark);
    }

    .story-user-info span {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    /* --- 6. 安全承诺板块 --- */
    .safety-section {
      padding: 80px 0;
      background-color: #fff5f6;
    }

    .safety-content {
      max-width: 800px;
      margin: 0 auto;
      text-align: center;
    }

    .safety-badge {
      background: #ffffff;
      color: var(--primary-color);
      border: 1px solid rgba(214, 40, 70, 0.1);
      padding: 8px 16px;
      border-radius: 50px;
      font-weight: 800;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 24px;
    }

    .safety-text {
      font-size: 1.2rem;
      color: var(--text-medium);
      line-height: 1.8;
      margin-bottom: 32px;
    }

    .safety-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 24px;
    }

    .safety-item {
      background: #ffffff;
      padding: 12px 24px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-dark);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .safety-item svg {
      color: #10b981; /* 信任绿 */
    }

    /* --- 7. 页脚 --- */
    .footer {
      background: #111827;
      color: #9ca3af;
      padding: 48px 0;
      text-align: center;
    }

    .footer-logo {
      color: #ffffff;
      font-size: 1.4rem;
      font-weight: 900;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 16px;
    }

    .footer-logo svg {
      fill: var(--primary-color);
    }

    .footer-links {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 24px;
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    /* --- 🚨 响应式媒体查询（极致精修） --- */
    @media (max-width: 991.98px) {
      .hero-section {
        padding-top: calc(var(--navbar-height) + 20px);
        padding-bottom: 60px;
        background: #ffffff; /* 移动端使用纯白高对比底色 */
      }

      .hero-grid {
        grid-template-columns: 1fr; /* 移动端垂直排版 */
        gap: 32px;
      }

      .hero-content {
        text-align: center;
        margin: 0 auto;
      }

      .badge {
        justify-content: center;
      }

      .hero-title span::after {
        height: 4px;
      }

      /* 🚨 移动端下载按钮排版优化：横向等宽排开，并限定最高宽度，防止拉得过宽 */
      .download-buttons {
        justify-content: center;
        max-width: 500px;
        margin: 0 auto;
      }

      .app-btn {
        flex: 1 1 calc(50% - 8px); /* 允许在一行内对称排列 */
        min-width: 160px;
        padding: 10px 16px;
      }

      .app-btn svg {
        width: 20px;
        height: 20px;
      }

      .app-btn-text .top-text {
        font-size: 0.65rem;
      }

      .app-btn-text .main-text {
        font-size: 0.95rem;
      }

      /* 🚨 在移动端，配图优雅地展示在文字下方，绝对不与文字产生重叠 */
      .hero-visual-wrapper {
        order: 2;
        margin-top: 20px;
      }

      .hero-photo-card {
        transform: none; /* 移动端不加倾斜 */
        max-width: 100%;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
        padding: 12px;
      }

      .hero-photo-card:hover {
        transform: none;
      }
    }

    @media (max-width: 480px) {
      /* 🚨 针对极小屏幕手机（如 iPhone SE 等），将按钮调整为垂直两行，确保字号不被压缩 */
      .download-buttons {
        flex-direction: column;
        width: 100%;
      }

      .app-btn {
        width: 100%;
        flex: none;
      }
    }