/* 全局重置与基础变量 */
    :root {
      --brand-green: #0f9d7a;
      --brand-green-light: #e8f7f3;
      --brand-green-hover: #0b8a6a;
      --text-main: #111111;
      --text-secondary: #555555;
      --bg-body: #ffffff;
      --bg-soft: #f7f9f9;
      --bg-soft-cyan: #f0f9f8;
      --border-color: #e4e8e8;
      --radius-md: 12px;
      --radius-lg: 20px;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      --max-width: 1200px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    }

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

    body {
      font-family: var(--font-family);
      color: var(--text-main);
      background-color: var(--bg-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    ul {
      list-style: none;
    }

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮样式 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s ease;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background-color: var(--brand-green);
      color: #ffffff;
    }

    .btn-primary:hover {
      background-color: var(--brand-green-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(15, 157, 122, 0.3);
    }

    .btn-outline {
      background-color: transparent;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

    .btn-outline:hover {
      border-color: var(--brand-green);
      color: var(--brand-green);
    }

    /* 头部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 22px;
      font-weight: 800;
      letter-spacing: -0.5px;
    }

    .logo-wrap img {
      height: 32px;
      width: auto;
      border-radius: 6px;
    }

    .nav-menu {
      display: flex;
      gap: 32px;
    }

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
    }

    .nav-menu a:hover {
      color: var(--brand-green);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero 区 */
    .hero-section {
      padding: 80px 0;
      background: linear-gradient(135deg, #ffffff 0%, var(--bg-soft-cyan) 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }

    .hero-content h1 span {
      color: var(--brand-green);
    }

    .hero-content p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 40px;
    }

    .hero-tags span {
      background: var(--brand-green-light);
      color: var(--brand-green);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
    }

    .hero-visual img {
      width: 100%;
      max-width: 340px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      border: 4px solid #ffffff;
      transition: transform 0.4s ease;
    }

    .hero-visual img:hover {
      transform: translateY(-8px) rotate(1deg);
    }

    /* 核心功能 */
    .features-section {
      padding: 100px 0;
      background-color: var(--bg-body);
    }

    .section-header {
      text-align: center;
      max-width: 600px;
      margin: 0 auto 60px;
    }

    .section-header h2 {
      font-size: 36px;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .section-header p {
      color: var(--text-secondary);
      font-size: 16px;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-soft);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }

    .feature-card:hover {
      background: #ffffff;
      border-color: var(--brand-green);
      box-shadow: var(--shadow-sm);
      transform: translateY(-4px);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      background: var(--brand-green-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* 界面展示 */
    .gallery-section {
      padding: 100px 0;
      background-color: var(--bg-soft-cyan);
    }

    .gallery-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 24px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }

    .gallery-scroll::-webkit-scrollbar {
      height: 8px;
    }

    .gallery-scroll::-webkit-scrollbar-track {
      background: rgba(0, 0, 0, 0.05);
      border-radius: 10px;
    }

    .gallery-scroll::-webkit-scrollbar-thumb {
      background: var(--brand-green);
      border-radius: 10px;
    }

    .gallery-item {
      flex: 0 0 240px;
      scroll-snap-align: start;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      background: #ffffff;
      border: 1px solid var(--border-color);
    }

    .gallery-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 深度内容 */
    .deep-content-section {
      padding: 100px 0;
      background-color: var(--bg-body);
    }

    .deep-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .deep-card {
      display: flex;
      gap: 24px;
      background: var(--bg-soft);
      border-radius: var(--radius-lg);
      padding: 32px;
      align-items: flex-start;
    }

    .deep-card.reverse {
      flex-direction: row-reverse;
    }

    .deep-card-text {
      flex: 1;
    }

    .deep-card-text h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--brand-green);
    }

    .deep-card-text p {
      font-size: 15px;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    .deep-card-text ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .deep-card-text li {
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .deep-card-text li::before {
      content: "✓";
      color: var(--brand-green);
      font-weight: bold;
    }

    /* 用户评论 */
    .reviews-section {
      padding: 100px 0;
      background-color: var(--bg-soft);
    }

    .review-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .review-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
      border: 2px solid var(--brand-green-light);
    }

    .review-user {
      display: flex;
      flex-direction: column;
    }

    .review-user .name {
      font-weight: 700;
      font-size: 16px;
    }

    .review-user .role {
      font-size: 13px;
      color: var(--text-secondary);
    }

    .review-text {
      font-size: 15px;
      color: var(--text-main);
      line-height: 1.7;
    }

    /* 隐私安全与常见问题 */
    .info-section {
      padding: 100px 0;
      background-color: var(--bg-body);
    }

    .info-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }

    .info-block h2 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 24px;
    }

    .privacy-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .privacy-item {
      background: var(--bg-soft-cyan);
      padding: 24px;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--brand-green);
    }

    .privacy-item h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .privacy-item p {
      font-size: 15px;
      color: var(--text-secondary);
    }

    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      background: #ffffff;
    }

    .faq-item h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--brand-green);
    }

    .faq-item p {
      font-size: 15px;
      color: var(--text-secondary);
    }

    /* 下载板块 */
    .download-section {
      padding: 100px 0;
      background: linear-gradient(180deg, var(--bg-soft-cyan) 0%, #ffffff 100%);
      border-top: 1px solid var(--border-color);
    }

    .download-inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .download-inner h2 {
      font-size: 36px;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .download-inner > p {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 600px;
    }

    .download-box {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 48px;
      background: #ffffff;
      padding: 40px 60px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      margin-bottom: 40px;
      width: 100%;
      max-width: 800px;
    }

    .download-qr {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    .download-qr img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .download-qr span {
      font-size: 13px;
      color: var(--text-secondary);
      font-weight: 500;
    }

    .download-steps {
      text-align: left;
      flex: 1;
    }

    .download-steps h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .download-steps ol {
      padding-left: 20px;
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.8;
    }

    .download-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--bg-soft);
      padding: 60px 0 32px;
      border-top: 1px solid var(--border-color);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 48px;
    }

    .footer-brand p {
      font-size: 14px;
      color: var(--text-secondary);
      margin-top: 16px;
      max-width: 320px;
    }

    .footer-links h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links ul {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-links a {
      font-size: 14px;
      color: var(--text-secondary);
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: var(--brand-green);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-bottom p {
      font-size: 13px;
      color: #888888;
    }

    .update-time {
      font-size: 13px;
      color: #999999;
    }

    /* 弹窗 */
    .modal-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 1000;
      padding: 20px;
    }

    .modal-overlay.active {
      display: flex;
    }

    .modal-content {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      max-width: 420px;
      width: 100%;
      text-align: center;
      box-shadow: var(--shadow-md);
    }

    .modal-content p {
      font-size: 15px;
      color: var(--text-main);
      margin-bottom: 20px;
      line-height: 1.6;
    }

    .modal-link-box {
      display: flex;
      align-items: center;
      background: var(--bg-soft);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 10px 14px;
      margin-bottom: 20px;
      gap: 10px;
    }

    .modal-link-box input {
      flex: 1;
      border: none;
      background: transparent;
      font-size: 14px;
      color: var(--text-secondary);
      outline: none;
    }

    .modal-copy-btn {
      background: var(--brand-green);
      color: #ffffff;
      border: none;
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      white-space: nowrap;
    }

    .modal-copy-btn:hover {
      background: var(--brand-green-hover);
    }

    .modal-close {
      background: transparent;
      border: 1px solid var(--border-color);
      padding: 10px 24px;
      border-radius: 20px;
      font-size: 14px;
      cursor: pointer;
      color: var(--text-secondary);
      width: 100%;
    }

    .modal-close:hover {
      background: var(--bg-soft);
    }

    /* 响应式断点 1024px */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
      }

      .hero-content p {
        margin: 0 auto 32px;
      }

      .hero-tags {
        justify-content: center;
      }

      .hero-buttons {
        justify-content: center;
      }

      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .deep-grid {
        grid-template-columns: 1fr;
      }

      .deep-card.reverse {
        flex-direction: row;
      }

      .info-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* 响应式断点 768px */
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-sm);
      }

      .nav-menu.active {
        display: flex;
      }

      .mobile-menu-toggle {
        display: block;
      }

      .header-actions .btn {
        display: none;
      }

      .hero-content h1 {
        font-size: 32px;
      }

      .hero-content p {
        font-size: 16px;
      }

      .features-grid {
        grid-template-columns: 1fr;
      }

      .review-grid {
        grid-template-columns: 1fr;
      }

      .download-box {
        flex-direction: column;
        padding: 32px 24px;
        gap: 32px;
      }

      .download-steps {
        text-align: center;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }

      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }

      .deep-card, .deep-card.reverse {
        flex-direction: column;
        padding: 24px;
      }

      .gallery-item {
        flex: 0 0 200px;
      }
    }