:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 24px;
}

h1, h2 {
    margin-top: 0;
    color: var(--text-main);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.device-card {
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 16px;
    transition: transform 0.2s;
}

.device-card:hover {
    transform: translateY(-2px);
}

.status-online {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: var(--success);
    border-radius: 50%;
    margin-right: 8px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-size: 14px;
    margin: 4px;
}

.btn-primary { background: var(--primary-color); color: white; }
.btn-primary:hover { background: var(--primary-hover); }

.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-warning { background: var(--warning); color: white; }

.btn-sm { padding: 4px 8px; font-size: 12px; }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid #e5e7eb;
}

.nav {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
}

.nav a.active {
    color: var(--primary-color);
}