/* Mobile-first Layout */
:root {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --accent: #0066ff;
    --bg: #f4f4f7;
}

body {
    margin: 0;
    background: var(--bg);
    color: #111;
}

header {
    padding: 1rem;
    background: var(--accent);
    color: #fff;
    text-align: center;
    font-size: 1.25rem;
}

main {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#controls label {
    display: flex;
    flex-direction: column;
    margin-bottom: .5rem;
}

#controls input,
#controls select {
    padding: .5rem;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: .25rem;
}

.btnRow {
    display: flex;
    gap: .5rem;
    margin: .5rem 0;
}

button {
    flex: 1;
    padding: .6rem;
    font-size: 1rem;
    border: none;
    border-radius: .25rem;
    background: var(--accent);
    color: #fff;
}

button:disabled {
    background: #999;
}

#status {
    margin-top: .5rem;
    font-weight: 600;
}

#meterSection {
    display: flex;
    align-items: center;
    gap: .5rem;
}

#meter {
    flex: 1;
    height: 16px;
    background: #ddd;
    border-radius: 8px;
}

#meterVal {
    width: 4rem;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

#log {
    width: 100%;
    min-height: 120px;
    font-family: monospace;
    resize: vertical;
}