body {
    margin: 0;
    background: #111;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    overflow: hidden;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 140px;
    height: 100vh;
    background: #1f1f1f;
    border-right: 1px solid #333;
}

.nav-button {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    border-bottom: 1px solid #333;
    cursor: pointer;
    text-decoration: none;
    color: white;
}

.nav-button:hover {
    background: #2a2a2a;
}

.content {
    margin-left: 140px;
    padding: 15px;
    height: 100vh;
    box-sizing: border-box;
}

.page-title {
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 20px;
}

.card {
    background: #222;
    border-radius: 12px;
    padding: 15px;
}

.system-card {
    background: #222;
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 10px;
}

.btn {
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    color: white;
    font-size: 16px;
    cursor: pointer;
}

.btn-start {
    background: #2e7d32;
}

.btn-stop {
    background: #c62828;
}

.btn-restart {
    background: #ef6c00;
}

::-webkit-scrollbar {
    width: 0;
    background: transparent;
}

* {
    scrollbar-width: none;
}