:root{--primary-red:#3b6ea0;--primary-red-dark:#3d6ba8;--primary-red-light:#6ba3e0;--text-dark:#333;--text-gray:#666;--text-light:#999;--bg-light:#f5f5f5;--bg-white:#fff;--border-color:#e0e0e0;--border-light:#eee;--shadow:0px 2px 3px rgba(0,0,0,.1);--transition:all 0.3s ease;--safe-bottom:env(safe-area-inset-bottom,0)}*{margin:0;padding:0;box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{font-family:Noto Sans SC,Microsoft YaHei,PingFang SC,sans-serif;font-size:14px;color:var(--text-dark);line-height:1.6;background:var(--bg-light)}.app{padding-bottom:calc(70px + var(--safe-bottom))}.app.app-smart-qa{height:100vh;overflow:hidden;display:flex;flex-direction:column;padding-bottom:0}.app.app-smart-qa .main-content{flex:1 1;min-height:0;overflow:hidden}[role=button],a,button{cursor:pointer}a{color:var(--text-dark);text-decoration:none;transition:var(--transition)}a:active,a:hover{color:var(--primary-red)}ol,ul{list-style:none}img{max-width:100%;height:auto}