/* roulang page: index */
:root {
      --米兰红: #C8102E;
      --黑曜石: #1A1A1A;
      --草绿: #00A859;
      --暖白纸莎草: #F5F3EE;
      --纯白: #FFFFFF;
      --浅灰边框: #E8E6E1;
      --主标题色: #1A1A1A;
      --正文色: #4A4A4A;
      --辅助色: #8C8C8C;
      --成功色: #00A859;
      --警示色: #F5A623;
      --卡片阴影: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --卡片阴影悬浮: 0 4px 12px rgba(0,0,0,0.08);
      --圆角卡片: 12px;
      --圆角按钮: 8px;
      --圆角标签: 4px;
      --过渡快速: 0.2s ease;
      --字体系统: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      --数字字体: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --内容最大宽度: 1200px;
      --板块间距桌面: 80px;
      --板块间距平板: 60px;
      --板块间距手机: 48px;
    }

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

    body {
      font-family: var(--字体系统);
      background-color: var(--暖白纸莎草);
      color: var(--正文色);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--内容最大宽度);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

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

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--过渡快速);
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      transition: all var(--过渡快速);
    }

    h1, h2, h3 {
      color: var(--主标题色);
      line-height: 1.3;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-bottom: 1px solid transparent;
      transition: background var(--过渡快速), box-shadow var(--过渡快速), border-color var(--过渡快速);
      height: 64px;
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 1px 4px rgba(0,0,0,0.06);
      border-bottom: 1px solid var(--浅灰边框);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--内容最大宽度);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      font-weight: 700;
      font-size: 20px;
      color: var(--黑曜石);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      margin-right: 10px;
      background: var(--米兰红);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L2 22h20L12 2zm0 3.5L18.5 20h-13L12 5.5z"/><circle cx="12" cy="20" r="1.5"/></svg>') center/contain no-repeat;
      background-color: var(--米兰红);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--黑曜石);
      position: relative;
      padding-bottom: 4px;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--米兰红);
      transition: width var(--过渡快速);
    }

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--草绿);
      color: white;
      padding: 10px 20px;
      border-radius: var(--圆角按钮);
      font-weight: 600;
      font-size: 15px;
      white-space: nowrap;
    }

    .nav-cta:hover {
      filter: brightness(0.9);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--米兰红);
      border-radius: 2px;
      transition: all var(--过渡快速);
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      right: 0;
      width: 280px;
      height: 100vh;
      background: white;
      box-shadow: -4px 0 20px rgba(0,0,0,0.1);
      z-index: 1100;
      flex-direction: column;
      padding: 24px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      display: block;
      padding: 16px 0;
      font-size: 18px;
      font-weight: 500;
      border-bottom: 1px solid var(--浅灰边框);
      color: var(--黑曜石);
    }

    .mobile-menu .mobile-cta {
      margin-top: 24px;
      background: var(--草绿);
      color: white;
      text-align: center;
      padding: 14px;
      border-radius: var(--圆角按钮);
      font-weight: 600;
      font-size: 18px;
    }

    .overlay {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.4);
      z-index: 1050;
    }

    .overlay.show {
      display: block;
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(90deg, #FFFFFF 50%, var(--暖白纸莎草) 50%);
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-content {
      flex: 1;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--正文色);
      max-width: 480px;
      margin-bottom: 32px;
      line-height: 1.6;
    }

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

    .btn-primary {
      background: var(--草绿);
      color: white;
      padding: 14px 32px;
      border-radius: var(--圆角按钮);
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 2px 6px rgba(0,168,89,0.3);
    }

    .btn-primary:hover {
      filter: brightness(0.9);
      transform: translateY(-1px);
    }

    .btn-outline {
      border: 2px solid var(--米兰红);
      color: var(--米兰红);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--圆角按钮);
      font-weight: 600;
      font-size: 16px;
    }

    .btn-outline:hover {
      background: rgba(200,16,46,0.05);
    }

    .hero-meta {
      font-size: 13px;
      color: var(--辅助色);
    }

    .hero-image {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 板块通用 */
    section {
      padding: var(--板块间距桌面) 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 24px;
      background: var(--米兰红);
      border-radius: 2px;
    }

    .section-sub {
      font-size: 16px;
      color: var(--辅助色);
      margin-bottom: 40px;
    }

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

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--纯白);
      border-radius: var(--圆角卡片);
      padding: 32px;
      box-shadow: var(--卡片阴影);
      transition: all var(--过渡快速);
    }

    .feature-card:hover {
      box-shadow: var(--卡片阴影悬浮);
      transform: translateY(-2px);
    }

    .feature-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 20px;
      background: var(--米兰红);
      mask-size: contain;
      mask-repeat: no-repeat;
      mask-position: center;
    }

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

    .function-list {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .function-item {
      display: flex;
      gap: 16px;
      padding: 12px 0;
      border-left: 1px solid #E0DED9;
      padding-left: 16px;
    }

    .func-icon-small {
      width: 32px;
      height: 32px;
      background: var(--草绿);
      mask-size: contain;
      mask-repeat: no-repeat;
      flex-shrink: 0;
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-img {
      flex: 1;
      border-radius: var(--圆角卡片);
      overflow: hidden;
    }

    .scenario-text {
      flex: 1;
    }

    .tag {
      display: inline-block;
      background: rgba(0,168,89,0.1);
      color: var(--草绿);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: var(--圆角标签);
      margin-top: 12px;
    }

    .stat-card {
      background: white;
      padding: 24px;
      border-radius: var(--圆角卡片);
      text-align: center;
      box-shadow: var(--卡片阴影);
    }

    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--草绿);
      font-family: var(--数字字体);
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--浅灰边框);
      padding: 16px 0;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--黑曜石);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--暖白纸莎草);
      border-radius: 8px;
      margin-top: 8px;
      padding: 0 16px;
      color: var(--正文色);
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    .cta-section {
      background: linear-gradient(180deg, var(--暖白纸莎草) 0%, white 100%);
      text-align: center;
      padding: 80px 0;
    }

    .cta-btn-large {
      background: var(--草绿);
      color: white;
      padding: 16px 40px;
      font-size: 18px;
      font-weight: 600;
      border-radius: 12px;
      display: inline-block;
      margin: 24px 0 16px;
    }

    .store-icons img {
      height: 48px;
      margin: 0 8px;
      filter: grayscale(100%);
      transition: filter 0.2s;
    }

    .store-icons img:hover {
      filter: none;
    }

    .site-footer {
      background: var(--黑曜石);
      color: #CCCCCC;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-links a {
      display: block;
      color: #CCCCCC;
      font-size: 14px;
      margin-bottom: 8px;
    }

    .footer-links a:hover {
      color: var(--米兰红);
    }

    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
      color: #666;
    }

    @media (max-width: 1024px) {
      .hero-title { font-size: 36px; }
      .grid-3, .function-list { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .scenario-row { flex-direction: column; gap: 24px; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .mobile-menu { display: flex; }
      .hero { padding: 100px 0 50px; background: var(--暖白纸莎草); }
      .hero .container { flex-direction: column; }
      .hero-title { font-size: 28px; }
      .grid-3, .function-list, .grid-4 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 48px 0; }
    }