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

body{
    height:100vh;
    font-family:"Segoe UI","Microsoft YaHei",sans-serif;
    background:#0b1220;
    color:#e2e8f0;
}

/* 主布局 */
.app{
    display:flex;
    flex-direction:column;
    height:100vh;
}

/* 标题栏 */
.topbar{
    height:52px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:0 16px;

    background:linear-gradient(180deg,#1f2937,#111827);
    border-bottom:1px solid rgba(148,163,184,0.18);

    color:#e2e8f0;
    font-size:14px;
    letter-spacing:0.5px;
    font-weight:500;

    box-shadow:0 1px 0 rgba(0,0,0,0.4);
}

.device{
    font-family: ui-monospace, monospace;
    display:flex;
    align-items:center;
    gap:8px;
    font-size:15px;
    font-weight:500
}

.device .icon{
    display:inline-block;
    transform: translate(2px, -1px);
}

.actions{
    display:flex;
    align-items:center;
    gap:10px;
}

.logout-btn{
    background:rgba(239,68,68,0.08);
    border:1px solid rgba(239,68,68,0.35);
    color:#f87171;
    padding:6px 12px;
    display:flex;
    border-radius:6px;
    font-size:12px;
    cursor:pointer;
    transition:0.2s;
}

.logout-btn:hover{
    background:#ef4444;
    border-color:#ef4444;
    color:#fff;
}

/* 次布局 */
.layout{
    display:flex;
    flex:1;
    overflow:hidden;
}

/* 左侧栏 */
.sidebar{
    width:240px;
    height:100%;

    background:#0f172a;
    border-right:1px solid rgba(148,163,184,0.12);

    display:flex;
    flex-direction:column;
}

.menu{
    padding:10px;
    display:flex;
    flex-direction:column;
    gap:6px;
}

.menu-item{
    display:flex;
    align-items:center;
    gap:10px;
    padding:14px 16px;
    border-radius:10px;
    cursor:pointer;
    color:#94a3b8;
    font-size:15px;
    font-weight:500;
    transition:0.2s;
}

.menu-item:hover{
    background:#1e293b;
    color:white;
}

.menu-item.active{
    background:#2563eb;
    color:white;
}

/* 页容器 */
.view{
    flex:1;
    padding:20px;
    overflow:auto;
    background:#0f172a;
}

/* 页风格 */
.card{
    background:#0f172a;
    border:1px solid #1f2937;
    border-radius:10px;
    padding:20px;
    margin-bottom:15px;
    box-shadow:0 0 20px rgba(0,0,0,0.25);
}

h1{
    font-size:20px;
    margin-bottom:10px;
    color:#e2e8f0;
}

p{
    font-size:15px;
    color:#94a3b8;
}