/* ══ 壳子专用样式：登录、顶栏、侧边栏、布局 ══ */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:#f0f2f5;height:100vh;display:flex;flex-direction:column}

/* ── 登录浮层 ── */
.login-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:#f0f2f5;z-index:9999;align-items:center;justify-content:center}
.login-overlay.show{display:flex}
.login-box{background:#fff;border-radius:12px;padding:32px;width:360px;box-shadow:0 2px 12px rgba(0,0,0,.1)}
.login-box h2{font-size:20px;margin-bottom:8px;text-align:center}
.login-box .tenant-hint{text-align:center;font-size:13px;color:#999;margin-bottom:20px}
.login-box input{width:100%;padding:10px 14px;border:1px solid #ddd;border-radius:8px;font-size:15px;margin-bottom:12px;outline:none}
.login-box input:focus{border-color:#4a9eff}
.login-box button{width:100%;padding:10px;background:#4a9eff;color:#fff;border:none;border-radius:8px;font-size:15px;cursor:pointer}
.login-box button:hover{background:#3a7eef}
.login-box .err{color:#ef4444;font-size:13px;text-align:center;margin-top:8px;display:none}

/* ── 顶栏 ── */
.topbar{background:#1a1f36;color:#fff;display:flex;align-items:center;padding:0 20px;height:48px;flex-shrink:0}
.topbar .logo{font-size:16px;font-weight:700;margin-right:24px}
.topbar .nav-right{margin-left:auto;font-size:12px;color:#889;display:flex;gap:16px;align-items:center}

/* ── 主布局 ── */
.main-layout{flex:1;display:flex;overflow:hidden}

/* ── 侧边栏 ── */
.sidebar{width:200px;background:#fff;border-right:1px solid #e0e0e0;display:flex;flex-direction:column;overflow-y:auto;flex-shrink:0}
.sidebar .menu-group{padding:0}
.sidebar .menu-group-title{font-size:11px;color:#999;padding:10px 16px 4px;cursor:pointer;user-select:none;display:flex;align-items:center;gap:4px}
.sidebar .menu-group-title:hover{color:#666}
.sidebar .menu-group-title .arrow{font-size:10px;transition:transform .2s;display:inline-block}
.sidebar .menu-group-title.collapsed .arrow{transform:rotate(-90deg)}
.sidebar .menu-item{padding:10px 16px;cursor:pointer;font-size:14px;color:#555;display:flex;align-items:center;gap:8px;border-left:3px solid transparent;transition:all .15s}
.sidebar .menu-item:hover{background:#f5f8fc;color:#333}
.sidebar .menu-item.active{background:#f0f5ff;color:#4a9eff;border-left-color:#4a9eff;font-weight:600}
/* 折叠状态：隐藏组内所有菜单项 */
.menu-group-title.collapsed ~ .menu-item{display:none}

/* ── 内容区 ── */
.content{flex:1;overflow:hidden;display:flex;flex-direction:column}
.content-area{flex:1;overflow-y:auto;display:flex;flex-direction:column}
.content-placeholder{display:flex;align-items:center;justify-content:center;height:100%;color:#bbb;font-size:14px}
.page-loading{display:flex;align-items:center;justify-content:center;padding:40px;color:#999;font-size:13px}

/* ── 退出按钮 ── */
.btn-logout{background:none;border:1px solid #555;color:#889;cursor:pointer;font-size:11px;padding:3px 10px;border-radius:4px}
.btn-logout:hover{color:#fff;border-color:#888}