:root {
    color-scheme: dark;
    --bg: #10131a;
    --panel: #1b212c;
    --text: #f2f4f8;
    --muted: #a8b0bf;
    --accent: #47b0ff;
    --warning: #ff7c5c;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.page {
    width: min(920px, 100% - 2rem);
    margin: 1.5rem auto 2rem;
    display: grid;
    gap: 1rem;
}

.panel {
    background: var(--panel);
    border-radius: 12px;
    padding: 1rem;
}

h1 {
    margin: 0;
    font-size: 1.7rem;
}

.subtitle,
.mode-description,
.back-link {
    margin: 0.5rem 0 0;
    color: var(--muted);
}

.back-link a {
    color: var(--accent);
}

.controls-panel {
    display: grid;
    gap: 0.9rem;
}

.mode-fields {
    display: grid;
    gap: 0.75rem;
}

.field {
    display: grid;
    gap: 0.35rem;
}

label {
    font-weight: 600;
}

input,
select,
button {
    font: inherit;
}

input,
select {
    width: 100%;
    border: 1px solid #313a4a;
    border-radius: 8px;
    padding: 0.55rem 0.65rem;
    background: #101726;
    color: var(--text);
}

.duration-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.field-hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    align-items: center;
}

button {
    border: 0;
    border-radius: 8px;
    padding: 0.55rem 0.9rem;
    background: #2a3343;
    color: var(--text);
    cursor: pointer;
}

button:hover:not(:disabled) {
    background: #36455b;
}

button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.sound-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--muted);
}

.sound-toggle input {
    width: auto;
}

.error-message {
    color: var(--warning);
    min-height: 1.2rem;
    margin: 0;
}

.timer-panel {
    text-align: center;
}

.status-badge {
    display: inline-block;
    margin: 0;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    background: #2a3343;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
}

.status-running {
    background: rgba(71, 176, 255, 0.2);
    color: #8ed0ff;
}

.status-paused {
    background: rgba(255, 204, 102, 0.2);
    color: #ffd37d;
}

.status-completed {
    background: rgba(109, 227, 156, 0.2);
    color: #85f0b2;
}

.timer-display {
    margin: 0.55rem 0 0.75rem;
    font-size: clamp(2.4rem, 9vw, 4.6rem);
    letter-spacing: 0.04em;
    font-variant-numeric: tabular-nums;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.7rem;
}

.stats-grid div {
    background: #121926;
    border-radius: 10px;
    padding: 0.6rem;
}

.stat-label {
    display: block;
    color: var(--muted);
    font-size: 0.8rem;
    margin-bottom: 0.2rem;
}

.stats-grid strong {
    font-size: 1.1rem;
    font-variant-numeric: tabular-nums;
}

@media (max-width: 620px) {
    .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}