*{
    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: 64px;
    background: linear-gradient(180deg, #1f2937, #111827);
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0;
}

.device{
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: 20px;
}

.device .icon{
    font-size: 28px;
    width: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.title-line {
    line-height: 1.3;
}

.title-line .title {
    font-size: 15px;
    font-weight: 600;
    color: #e2e8f0;
    letter-spacing: 0.5px;
}

.imei-line {
    line-height: 1.3;
}

#imei-value {
    font-family: ui-monospace, monospace;
    font-size: 15px;
    color: #94a3b8;
}

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

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

/* 左侧栏 */
.sidebar{
    width:240px;
    background:#0f172a;
    border-right:1px solid rgba(148,163,184,0.12);
    display:flex;
    flex-direction:column;
    padding: 20px;
}

.menu-item{
    display:flex;
    align-items:center;
    gap:10px;
    padding:14px 16px;
    border-radius:4px;
    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:6px;
    overflow:auto;
    background:#0f172a;
}

/* 页风格 */
.card{
    background:#0f172a;
    border:1px solid #1f2937;
    border-radius:4px;
    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;
}