/* 全局重置与变量 */
    :root {
      --brand-green: #10b981;
      --brand-green-hover: #059669;
      --brand-green-light: #ecfdf5;
      --text-main: #111827;
      --text-secondary: #4b5563;
      --bg-gray: #f3f4f6;
      --white: #ffffff;
      --border-color: #e5e7eb;
      --radius-lg: 16px;
      --radius-md: 10px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --max-width: 1200px;
    }

    * {
      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-main);
      background-color: var(--white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    ul {
      list-style: none;
    }

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

    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      z-index: 100;
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.2rem;
      color: var(--text-main);
    }

    .brand img {
      height: 32px;
      width: auto;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
    }

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

    .nav-cta {
      background: var(--brand-green);
      color: var(--white);
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s;
    }

    .nav-cta:hover {
      background: var(--brand-green-hover);
    }

    /* 首屏 Hero */
    .hero {
      background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 100%);
      padding: 80px 0 60px;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-badge {
      display: inline-block;
      background: var(--brand-green-light);
      color: var(--brand-green-hover);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

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

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 540px;
    }

    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      background: var(--brand-green);
      color: var(--white);
      padding: 16px 40px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
      transition: transform 0.2s, background 0.2s;
    }

    .btn-primary:hover {
      background: var(--brand-green-hover);
      transform: translateY(-2px);
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--white);
      color: var(--text-main);
      padding: 16px 32px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 1rem;
      border: 1px solid var(--border-color);
      transition: border-color 0.2s, background 0.2s;
    }

    .btn-secondary:hover {
      border-color: var(--brand-green);
      background: var(--brand-green-light);
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 20px;
    }

    .hero-stats div {
      display: flex;
      flex-direction: column;
    }

    .hero-stats strong {
      font-size: 1.4rem;
      font-weight: 700;
    }

    .hero-stats span {
      font-size: 0.85rem;
      color: var(--text-secondary);
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      position: relative;
    }

    .hero-visual img {
      width: 100%;
      max-width: 420px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.12);
      border: 4px solid var(--white);
    }

    /* 通用区块 */
    .section {
      padding: 90px 0;
    }

    .section-gray {
      background: var(--bg-gray);
    }

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

    .section-header h2 {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-header p {
      font-size: 1.05rem;
      color: var(--text-secondary);
    }

    /* 核心功能 - 卡片瀑布流 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      transition: box-shadow 0.2s, transform 0.2s;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      background: var(--brand-green-light);
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 1.6rem;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .feature-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }

    /* 界面展示 - 截图墙 */
    .screens-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .screen-card {
      text-align: center;
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 16px;
      border: 1px solid var(--border-color);
    }

    .screen-card img {
      width: 100%;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }

    .screen-card span {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 深度内容 - Z字型布局 */
    .z-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .z-row:nth-child(even) {
      flex-direction: row-reverse;
    }

    .z-text {
      flex: 1;
    }

    .z-text h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .z-text p {
      font-size: 1rem;
      color: var(--text-secondary);
      margin-bottom: 12px;
    }

    .z-text ul {
      margin-top: 16px;
    }

    .z-text li {
      position: relative;
      padding-left: 20px;
      margin-bottom: 8px;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }

    .z-text li::before {
      content: "•";
      position: absolute;
      left: 0;
      color: var(--brand-green);
      font-weight: bold;
    }

    .z-img {
      flex: 1;
    }

    .z-img img {
      width: 100%;
      border-radius: 16px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    /* 使用反馈 - 评论卡片 */
    .feedback-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feedback-card {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      display: flex;
      gap: 16px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      flex-shrink: 0;
      overflow: hidden;
      border: 2px solid var(--brand-green-light);
    }

    .avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .feedback-content h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .feedback-content .role {
      font-size: 0.8rem;
      color: var(--brand-green);
      margin-bottom: 8px;
      font-weight: 500;
    }

    .feedback-content p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    /* 隐私安全 - 阶梯榜单 */
    .privacy-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .privacy-item {
      display: flex;
      align-items: center;
      padding: 24px 32px;
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      gap: 20px;
    }

    .privacy-num {
      width: 40px;
      height: 40px;
      background: var(--brand-green);
      color: var(--white);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    .privacy-text h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .privacy-text p {
      font-size: 0.95rem;
      color: var(--text-secondary);
    }

    /* 常见问题 - 一问一答 */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

    .faq-q {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 10px;
      display: flex;
      gap: 10px;
      align-items: flex-start;
    }

    .faq-q span {
      color: var(--brand-green);
      font-weight: 800;
    }

    .faq-a {
      font-size: 0.95rem;
      color: var(--text-secondary);
      padding-left: 28px;
    }

    /* 下载板块 */
    .download-section {
      background: var(--brand-green);
      color: var(--white);
      padding: 80px 0;
      border-radius: 40px;
      margin: 0 20px 60px;
    }

    .download-inner {
      max-width: 1000px;
      margin: 0 auto;
      padding: 0 40px;
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .download-text {
      flex: 1;
    }

    .download-text h2 {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .download-text p {
      font-size: 1.05rem;
      margin-bottom: 24px;
      opacity: 0.9;
    }

    .install-steps {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 32px;
    }

    .install-steps li {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
    }

    .install-steps li strong {
      width: 24px;
      height: 24px;
      background: rgba(255,255,255,0.2);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
    }

    .download-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-download {
      background: var(--white);
      color: var(--brand-green-hover);
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1.05rem;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      transition: transform 0.2s;
    }

    .btn-download:hover {
      transform: translateY(-2px);
    }

    .btn-download-outline {
      background: transparent;
      color: var(--white);
      border: 2px solid rgba(255,255,255,0.5);
    }

    .btn-download-outline:hover {
      border-color: var(--white);
      background: rgba(255,255,255,0.1);
    }

    .download-qr {
      flex-shrink: 0;
      text-align: center;
    }

    .download-qr img {
      width: 160px;
      height: 160px;
      border-radius: 12px;
      background: var(--white);
      padding: 8px;
    }

    .download-qr p {
      margin-top: 10px;
      font-size: 0.85rem;
      opacity: 0.9;
    }

    /* 页脚 */
    footer {
      background: var(--white);
      border-top: 1px solid var(--border-color);
      padding: 40px 0;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 600;
    }

    .footer-brand img {
      height: 24px;
    }

    .footer-copy {
      font-size: 0.85rem;
      color: var(--text-secondary);
    }

    .footer-update {
      font-size: 0.75rem;
      color: #9ca3af;
    }

    /* 百度App复制弹窗 */
    .copy-modal-overlay {
      display: none;
      position: fixed;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,0,0,0.5);
      z-index: 9999;
      align-items: center;
      justify-content: center;
    }

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

    .copy-modal {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-lg);
      max-width: 340px;
      width: 90%;
      text-align: center;
    }

    .copy-modal p {
      font-size: 0.95rem;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.5;
    }

    .copy-link-box {
      background: var(--bg-gray);
      padding: 12px;
      border-radius: 8px;
      font-size: 0.85rem;
      color: var(--text-secondary);
      word-break: break-all;
      margin-bottom: 20px;
      border: 1px solid var(--border-color);
    }

    .copy-btn {
      background: var(--brand-green);
      color: var(--white);
      border: none;
      padding: 12px 32px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      width: 100%;
    }

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

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero h1 { font-size: 2.4rem; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .screens-grid { grid-template-columns: repeat(2, 1fr); }
      .download-inner { gap: 40px; }
      .z-row { gap: 40px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hero { padding: 40px 0; }
      .hero-content { flex-direction: column-reverse; gap: 40px; }
      .hero h1 { font-size: 2rem; }
      .hero-desc { font-size: 1rem; }
      .hero-btns { flex-direction: column; }
      .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
      .features-grid { grid-template-columns: 1fr; }
      .screens-grid { grid-template-columns: 1fr; }
      .z-row { flex-direction: column !important; gap: 24px; margin-bottom: 48px; }
      .z-img { width: 100%; }
      .feedback-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .privacy-item { padding: 20px; }
      .download-section { margin: 0 10px 40px; padding: 40px 0; }
      .download-inner { flex-direction: column; padding: 0 20px; gap: 40px; }
      .download-text h2 { font-size: 1.8rem; }
      .download-btns { flex-direction: column; }
      .btn-download { width: 100%; justify-content: center; }
      .footer-inner { flex-direction: column; text-align: center; }
      .section { padding: 50px 0; }
      .section-header h2 { font-size: 1.6rem; }
    }