:root {
      --main-blue: #2563eb;
      --main-blue-light: #3b82f6;
      --bento-bg: #f7fafd;
      --card-bg: #fff;
      --card-shadow: 0 4px 24px 0 rgba(37,99,235,0.07);
      --radius: 20px;
      --mobile-radius: 12px;
      --footer-bg: #f7fafd;
      --border: 1px solid #e5e7eb;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
      background: var(--bento-bg);
      color: #222;
      min-height: 100vh;
      overflow-x: hidden;
      padding-top: 30px;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 18px;
    }
    /* Hero区 */
    .hero {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 75px 0 80px 0;
    }
    .hero-text {
      flex: 1 1 100%;
      max-width: 900px;
    }
    .hero-title {
      font-size: clamp(1.6rem, 6vw, 3.5rem);
      font-weight: 900;
      color: var(--main-blue);
      margin-bottom: 60px;
      letter-spacing: 1.5px;
      line-height: 1.18;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .hero-desc {
      font-size: clamp(1rem, 4vw, 1.5rem);
      color: #333;
      margin-bottom: 70px;
      line-height: 1.7;
      font-weight: 500;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .hero-btn {
      background: var(--main-blue);
      color: #fff;
      border: none;
      border-radius: 14px;
      padding: 20px 52px;
      font-size: 1.3rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 24px 0 rgba(37,99,235,0.10);
      transition: background 0.2s, transform 0.18s;
      letter-spacing: 1px;
      display: inline-block;
      text-decoration: none;
      text-align: center;
      box-sizing: border-box;
      -webkit-tap-highlight-color: transparent;
    }
    .hero-btn:hover {
      background: var(--main-blue-light);
      transform: translateY(-2px) scale(1.04);
    }
    .hero-btn:active {
      transform: translateY(1px) scale(0.98);
      transition: transform 0.1s;
    }
    /* 按钮容器 */
    .hero-btn-container {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
    }
    /* 第二个按钮样式 */
    .hero-btn.secondary {
      background: #fff;
      color: var(--main-blue);
      border: 2px solid var(--main-blue);
      box-sizing: border-box;
    }
    .hero-btn.secondary:hover {
      background: #f0f7ff;
      transform: translateY(-2px) scale(1.04);
    }
    .hero-btn.secondary:active {
      background: #f0f7ff;
      transform: translateY(1px);
    }
    /* 功能副标题 */
    .subtitle {
      text-align: center;
      font-size: 1.2rem;
      font-weight: 400;
      color: #555;
      margin: 0 auto 40px;
      max-width: 800px;
      line-height: 1.5;
    }
    /* Bento Grid */
    .bento-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
      gap: 60px;
      margin: 40px 0;
    }
    .bento-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      padding: 32px 30px;
      position: relative;
      transition: transform 0.2s, box-shadow 0.2s;
      border: 1px solid rgba(37,99,235,0.05);
      overflow: hidden;
      min-height: 165px;
    }
    .bento-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(37,99,235,0.1);
    }
    .card-header {
      display: flex;
      align-items: center;
      margin-bottom: 34px;
    }
    .card-icon {
      font-size: 1.5rem;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-right: 18px;
      color: var(--main-blue);
    }
    .card-title {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--main-blue);
    }
    .bento-desc {
      color: #555;
      font-size: 1rem;
      line-height: 1.7;
      padding-left: 0;
    }
    /* Stats */
    .stats-section {
      margin: 120px 0 80px 0;
    }
    .stats-title {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 50px;
      color: var(--main-blue);
      text-align: center;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin: 40px 0;
      max-width: 100%;
    }
    .stats-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      padding: 34px 20px;
      text-align: center;
      transition: transform 0.18s;
    }
    .stats-card:hover {
      transform: translateY(-5px);
    }
    .stats-number {
      font-size: 2.4rem;
      font-weight: 900;
      color: var(--main-blue);
      margin-bottom: 16px;
    }
    .stats-label {
      font-size: 1.2rem;
      font-weight: 600;
      color: #333;
    }
    /* FAQ */
    .faq {
      margin: 120px 0 80px 0;
    }
    .faq-title {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 40px;
      color: var(--main-blue);
      text-align: center;
    }
    .faq-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
      gap: 28px;
    }
    .faq-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      padding: 38px 18px 14px 32px;
      min-height: 120px;
      border: 1.5px solid #f0f2f5;
      position: relative;
      overflow: hidden;
      transition: box-shadow 0.18s, background 0.18s;
    }
    .faq-card:hover {
      box-shadow: 0 8px 32px 0 rgba(37,99,235,0.10);
      background: #f7fafd;
    }
    .faq-q {
      font-weight: 700;
      margin-top: 0;
      margin-left: 10px;
      margin-bottom: 18px;
      color: #222;
      font-size: 1.08rem;
      z-index: 1;
    }
    .faq-a {
      color: #555;
      font-size: 1.01rem;
      margin-left: 10px;
      margin-bottom: 1px;
      margin-top: 0;
      z-index: 1;
    }
    /* Footer */
    .footer {
      margin-top: 100px;
      padding: 38px 0 18px 0;
      background: var(--footer-bg);
      text-align: center;
      color: #555;
      font-size: 1.01rem;
      border-radius: var(--radius) var(--radius) 0 0;
      border-top: var(--border);
      box-shadow: 0 2px 16px 0 rgba(37,99,235,0.03);
    }
    .footer a {
      color: inherit;
      text-decoration: none;
      font-weight: inherit;
      font-size: inherit;
    }
    /* 响应式优化 */
    /* 大屏幕平板 */
    @media (max-width: 1024px) {
      .hero {
        padding: 65px 0 60px 0;
      }
      .hero-title {
        font-size: 3.2rem;
        margin-bottom: 70px;
      }
      .hero-desc {
        font-size: 1.4rem;
        margin-bottom: 80px;
      }
      .subtitle {
        font-size: 1.1rem;
        margin-bottom: 35px;
      }
      .stats-section {
        margin: 80px 0 50px;
      }
    }
    /* 中等屏幕平板 */
    @media (max-width: 900px) {
      body {
        padding-top: 40px;
      }
      .hero {
        padding: 55px 0 45px 0;
      }
      .hero-title {
        font-size: 2.8rem;
        margin-bottom: 60px;
      }
      .hero-desc {
        font-size: 1.3rem;
        margin-bottom: 70px;
      }
      .hero-btn {
        padding: 18px 40px;
        font-size: 1.2rem;
      }
      .subtitle {
        font-size: 1rem;
        margin-bottom: 30px;
      }
      .bento-grid, .faq-list, .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: 24px;
        margin: 30px 0;
      }
      .stats-section {
        margin: 70px 0 40px;
      }
      .stats-number {
        font-size: 2rem;
      }
      .stats-label {
        font-size: 1.1rem;
      }
      .faq-title {
        margin-bottom: 30px;
      }
    }
    /* 小平板/大手机 */
    @media (max-width: 768px) {
      body {
        padding-top: 30px;
      }
      .hero {
        padding: 40px 0 32px 0;
      }
      .hero-title {
        font-size: 2.5rem;
        line-height: 1.3;
        margin-bottom: 50px;
      }
      .hero-desc {
        font-size: 1.2rem;
        margin-bottom: 60px;
        line-height: 1.6;
      }
      .hero-btn {
        width: 100%;
        max-width: 300px;
        padding: 16px 10px;
        font-size: 1.15rem;
      }
      .subtitle {
        font-size: 0.95rem;
        margin-bottom: 25px;
        padding: 0 10px;
      }
      .bento-card {
        padding: 28px 24px;
        min-height: 155px;
      }
      .card-header {
        margin-bottom: 30px;
      }
      .card-icon {
        font-size: 1.3rem;
        width: 36px;
        height: 36px;
        margin-right: 16px;
      }
      .card-title {
        font-size: 1.2rem;
      }
      .bento-desc {
        font-size: 0.95rem;
        line-height: 1.75;
        padding-left: 0;
      }
      .stats-section {
        margin: 60px 0 35px;
      }
      .stats-title {
        font-size: 1.8rem;
        margin-bottom: 30px;
      }
      .stats-number {
        font-size: 1.8rem;
      }
      .stats-label {
        font-size: 1rem;
      }
      .faq {
        margin: 60px 0;
      }
      .faq-title {
        font-size: 1.8rem;
      }
      .footer {
        margin-top: 70px;
      }
    }
    /* 手机端 */
    @media (max-width: 480px) {
      body {
        padding-top: 20px;
      }
      .container {
        padding: 0 12px;
      }
      .hero {
        padding: 70px 0 60px 0;
      }
      .hero-text {
        text-align: center;
      }
      .hero-title {
        font-size: clamp(1.1rem, 8vw, 2.2rem);
        margin-bottom: 40px;
        letter-spacing: 0;
        line-height: 1.4;
      }
      .hero-desc {
        font-size: clamp(0.9rem, 5vw, 1.1rem);
        margin-bottom: 50px;
        line-height: 1.6;
        padding: 0 5px;
      }
      .hero-btn {
        padding: 14px 10px;
        font-size: 0.95rem;
        border-radius: 10px;
        width: 140px;
        min-width: 140px;
        max-width: 140px;
        margin: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        height: 52px;
      }
      .hero-btn.secondary {
        width: 140px;
        min-width: 140px;
        max-width: 140px;
        height: 52px;
        display: flex;
        align-items: center;
        justify-content: center;
      }
      .hero-btn-container {
        gap: 12px;
        flex-direction: row;
        justify-content: center;
        flex-wrap: nowrap;
        display: flex;
        align-items: center;
      }
      .subtitle {
        font-size: 0.85rem;
        margin: 40px 0 20px;
        line-height: 1.6;
        padding: 0 5px;
      }
      .bento-grid, .faq-list {
        grid-template-columns: 1fr;
        gap: 16px;
        margin: 20px 0;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        margin: 20px 0;
      }
      .stats-section {
        margin: 90px 0 70px 0;
      }
      .stats-title {
        font-size: 1.6rem;
        margin-bottom: 25px;
      }
      .stats-card {
        padding: 24px 16px;
      }
      .stats-number {
        font-size: 1.7rem;
        margin-bottom: 10px;
      }
      .stats-label {
        font-size: 0.95rem;
      }
      .bento-card {
        padding: 24px 20px;
        border-radius: var(--mobile-radius);
        min-height: 145px;
      }
      .card-header {
        margin-bottom: 26px;
      }
      .card-icon {
        font-size: 1.2rem;
        width: 32px;
        height: 32px;
        margin-right: 14px;
      }
      .card-title {
        font-size: 1.2rem;
      }
      .bento-desc {
        font-size: 0.95rem;
        line-height: 1.75;
        padding-left: 0;
      }
      .faq {
        margin: 90px 0 50px 0;
      }
      .faq-title {
        font-size: 1.6rem;
        margin-bottom: 25px;
      }
      .faq-card {
        border-radius: var(--mobile-radius);
        padding: 28px 10px 8px 18px;
      }
      .faq-q {
        font-size: 0.95rem;
        margin-top: 0;
        margin-left: 10px;
        margin-bottom: 14px;
      }
      .faq-a {
        font-size: 0.88rem;
        line-height: 1.6;
        margin-left: 10px;
        margin-bottom: 1px;
        margin-top: 0;
      }
      .footer {
        margin-top: 60px;
        padding: 20px 10px 16px 10px;
        border-radius: 0;
        font-size: 0.85rem;
        line-height: 1.5;
      }
      #features {
        margin-bottom: 60px;
      }
    }
    /* 小型手机 */
    @media (max-width: 360px) {
      .hero-title {
        font-size: clamp(1rem, 10vw, 1.9rem);
      }
      .hero-desc {
        font-size: clamp(0.8rem, 6vw, 1rem);
        line-height: 1.6;
      }
      .hero-btn {
        font-size: 0.85rem;
        padding: 12px 8px;
        width: 120px;
        min-width: 120px;
        max-width: 120px;
        height: 48px;
      }
      .hero-btn.secondary {
        width: 120px;
        min-width: 120px;
        max-width: 120px;
        height: 48px;
      }
      .hero-btn-container {
        flex-direction: row;
        align-items: center;
        justify-content: center;
        flex-wrap: nowrap;
        gap: 10px;
      }
      .subtitle {
        font-size: 0.8rem;
      }
      .card-icon {
        font-size: 1rem;
        width: 28px;
        height: 28px;
        margin-right: 12px;
      }
      .card-title {
        font-size: 1.2rem;
      }
      .bento-desc {
        font-size: 0.85rem;
        padding-left: 0;
      }
      .stats-number {
        font-size: 1.5rem;
      }
      .stats-label {
        font-size: 0.9rem;
      }
      .hero {
        padding: 40px 0 32px 0;
      }
    }
    /* 移动端触摸结束后恢复状态 */
    @media (hover: none) {
      .hero-btn:hover {
        transform: none;
        background: var(--main-blue);
      }
      .hero-btn.secondary:hover {
        transform: none;
        background: #fff;
      }
      .hero-btn:active {
        transform: translateY(1px);
        background: var(--main-blue-light);
        transition: transform 0.1s, background 0.1s;
      }
      .hero-btn.secondary:active {
        background: #f0f7ff;
        transform: translateY(1px);
        transition: transform 0.1s, background 0.1s;
      }
    }