/* roulang page: index */
:root {
      --primary: #0A1F3F;
      --accent: #F97316;
      --bg-light: #F8FAFC;
      --bg-blue-light: #E8F0FE;
      --card-white: #FFFFFF;
      --text-dark: #0F172A;
      --text-muted: #475569;
      --text-light: #CBD5E1;
      --border-light: #E2E8F0;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 24px rgba(10, 31, 63, 0.06);
      --shadow-hover: 0 12px 32px rgba(10, 31, 63, 0.12);
      --transition: 0.3s ease;
      --max-width: 1280px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航桌面 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 72px;
      background: white;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 40;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
    }
    .nav-logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-logo i {
      color: var(--accent);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding-bottom: 4px;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
      cursor: pointer;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 64px;
      background: white;
      border-top: 1px solid var(--border-light);
      z-index: 50;
      justify-content: space-around;
      align-items: center;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.02);
      padding-bottom: env(safe-area-inset-bottom);
    }
    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      font-size: 10px;
      font-weight: 500;
      text-decoration: none;
      transition: color var(--transition);
      gap: 4px;
    }
    .mobile-tab i {
      font-size: 22px;
    }
    .mobile-tab.active {
      color: var(--accent);
      font-weight: 700;
    }
    /* 汉堡菜单遮罩 */
    .mobile-overlay {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(10,31,63,0.95);
      z-index: 45;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }
    .mobile-overlay a {
      color: white;
      font-size: 24px;
      font-weight: 500;
      text-decoration: none;
    }
    .close-overlay {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      color: white;
      font-size: 32px;
      cursor: pointer;
    }
    /* 区块间距 */
    section {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-block;
      transition: background var(--transition), transform var(--transition);
      border: none;
      cursor: pointer;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: var(--accent);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-block;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .card-hover {
      transition: transform var(--transition), box-shadow var(--transition);
      background: var(--card-white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* 输入框 */
    input, textarea {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 16px;
      transition: border var(--transition);
      background: white;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--primary);
    }
    @media (max-width: 768px) {
      .desktop-nav .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      section {
        padding-top: 60px;
        padding-bottom: 60px;
      }
      h1 {
        font-size: 32px !important;
        line-height: 1.2 !important;
      }
      h2 {
        font-size: 28px;
      }
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
      body {
        padding-bottom: 80px;
      }
    }
    @media (min-width: 769px) {
      .mobile-bottom-nav, .mobile-menu-btn, .mobile-overlay {
        display: none !important;
      }
    }
    .bg-pattern {
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }