/* roulang page: index */
:root {
      --primary: #0E8C3A;
      --primary-dark: #0B6E2E;
      --secondary: #FF5E13;
      --dark-bg: #1A1A2E;
      --light-bg: #F8F9FA;
      --text-main: #1F2937;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 12px 24px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-badge: 24px;
      --sidebar-width: 240px;
      --mobile-header-height: 60px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: "Inter", "SF Pro Display", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .font-display {
      font-weight: 800;
      letter-spacing: -0.02em;
    }
    .container-main {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 左侧导航 App Shell */
    .app-sidebar {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--sidebar-width);
      height: 100vh;
      background-color: var(--dark-bg);
      color: white;
      display: flex;
      flex-direction: column;
      z-index: 40;
      transition: transform 0.3s ease;
      box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    }
    .sidebar-logo {
      padding: 2rem 1.5rem 1.5rem;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .sidebar-logo .brand {
      font-size: 1.5rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
    }
    .sidebar-logo .domain {
      font-size: 0.75rem;
      color: rgba(255,255,255,0.5);
      letter-spacing: 0.5px;
    }
    .sidebar-nav {
      flex: 1;
      padding: 1.5rem 0;
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
    }
    .sidebar-nav a {
      display: flex;
      align-items: center;
      padding: 0.75rem 1.5rem;
      color: rgba(255,255,255,0.75);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: all 0.2s;
      border-left: 3px solid transparent;
      position: relative;
    }
    .sidebar-nav a:hover {
      background-color: rgba(255,255,255,0.05);
      color: white;
    }
    .sidebar-nav a.active {
      color: white;
      border-left-color: var(--secondary);
      background-color: rgba(255,94,19,0.08);
    }
    .sidebar-footer {
      padding: 1.5rem;
      border-top: 1px solid rgba(255,255,255,0.1);
      display: flex;
      gap: 1rem;
      align-items: center;
    }
    .sidebar-footer a {
      color: rgba(255,255,255,0.6);
      transition: color 0.2s;
    }
    .sidebar-footer a:hover {
      color: var(--secondary);
    }
    /* 主内容区偏移 */
    .main-content {
      margin-left: var(--sidebar-width);
      transition: margin-left 0.3s;
      width: calc(100% - var(--sidebar-width));
    }
    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--mobile-header-height);
      background-color: var(--dark-bg);
      color: white;
      z-index: 50;
      align-items: center;
      padding: 0 1rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    }
    .hamburger {
      background: none;
      border: none;
      color: white;
      font-size: 1.5rem;
      cursor: pointer;
      margin-right: 1rem;
    }
    .mobile-brand {
      font-weight: 800;
      font-size: 1.2rem;
    }
    /* 抽屉菜单 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 280px;
      height: 100vh;
      background: var(--dark-bg);
      z-index: 100;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
    }
    .mobile-drawer.open {
      transform: translateX(0);
    }
    .drawer-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.5);
      z-index: 90;
      display: none;
    }
    .drawer-overlay.show {
      display: block;
    }
    /* Hero 动态徽章 */
    .hero-badge {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      border-radius: 24px;
      padding: 0.5rem 1.25rem;
      display: flex;
      align-items: center;
      gap: 0.25rem;
      color: white;
      font-weight: 600;
    }
    /* 数字动画视觉提示 */
    .counter-number {
      font-weight: 800;
    }
    /* 卡片组件 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
      border-color: var(--primary);
    }
    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.875rem 2rem;
      border: none;
      cursor: pointer;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
      text-decoration: none;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 0 2px rgba(14,140,58,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.75rem;
      cursor: pointer;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(14,140,58,0.05);
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 1rem 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-main);
      transition: 0.2s;
    }
    .faq-question:hover {
      background-color: #F3F4F6;
      padding-left: 0.5rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding-left: 2rem;
      font-size: 0.95rem;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 1rem;
    }
    .faq-item.open .faq-icon {
      transform: rotate(180deg);
      color: var(--secondary);
    }
    .faq-icon {
      transition: transform 0.3s, color 0.2s;
      font-size: 1.2rem;
      color: var(--text-muted);
    }
    /* 表单 */
    input, textarea {
      border: 1px solid #D1D5DB;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1rem;
      width: 100%;
      transition: 0.2s;
      font-family: inherit;
    }
    input:focus, textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(14,140,58,0.2);
      outline: none;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .app-sidebar {
        transform: translateX(-100%);
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .mobile-header {
        display: flex;
      }
      .container-main {
        padding-top: 1rem;
      }
    }
    @media (min-width: 1025px) {
      .mobile-header, .mobile-drawer, .drawer-overlay {
        display: none;
      }
    }
    @media (max-width: 768px) {
      .card:hover {
        transform: none;
      }
    }