:root {
    --primary: #2563eb;
    --bg: #f8fafc;
    --card: #ffffff;
}

body {
    font-family: system-ui, sans-serif;
    background: var(--bg);
    padding: 110px 20px 20px;
    margin: 0;
}


.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
}

.card {
    background: var(--card);
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    text-align: center;
    cursor: pointer;
    transition: 0.3s;
    border: 1px solid #e2e8f0;
}

.card:active {
    transform: scale(0.95);
    background: #eff6ff;
}

.card i {
    font-size: 24px;
    display: block;
    margin-bottom: 8px;
}

#status-bar {
    background: #1e293b;
    color: white;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    min-height: 40px;
    position: fixed;

    top: 20px;
    left: 20px;
    right: 20px;
}

.battery-low {
    color: #ef4444;
}