/* ── 大屏幕计时器 ── */
.fs-wrapper {
    text-align: center;
    padding: 2rem 0;
}

.fs-display {
    font-family: 'Fira Code', monospace;
    font-size: 4.5rem;
    font-weight: 700;
    color: #1a1a1a;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.fs-ms {
    font-size: 2.5rem;
    color: #666;
}

.fs-actions {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.fs-btn {
    min-width: 100px;
}

.fs-btn.running {
    background: #dc2626;
    color: white;
}

.fs-btn.running:hover {
    background: #b91c1c;
}

.fs-hint {
    font-size: 0.85rem;
    color: #999;
}

/* ── 全屏模式 ── */
.fs-wrapper.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: #1a1a2e;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    padding: 0;
}

.fs-wrapper.fullscreen .fs-display {
    font-size: 12vw;
    color: #e0e0e0;
}

.fs-wrapper.fullscreen .fs-ms {
    font-size: 6vw;
    color: #888;
}

.fs-wrapper.fullscreen .fs-actions {
    margin-top: 2rem;
}

.fs-wrapper.fullscreen .fs-btn {
    min-width: 120px;
    font-size: 1.1rem;
    padding: 0.75rem 1.5rem;
}

.fs-wrapper.fullscreen .fs-hint {
    color: #666;
    margin-top: 1.5rem;
}

/* ── Mobile ── */
@media (max-width: 640px) {
    .fs-display {
        font-size: 3rem;
    }
    .fs-ms {
        font-size: 1.8rem;
    }
    .fs-btn {
        min-width: 80px;
        padding: 0.65rem 1rem;
    }
}