.mode-controls {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    padding: 0.3rem;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
}

.mode-switch {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.16);
}

.mode-option {
    border: 0;
    border-radius: calc(var(--radius-md) - 4px);
    padding: 0.55rem 0.75rem;
    color: var(--text-secondary);
    background: transparent;
    cursor: pointer;
    font: inherit;
    font-size: 0.88rem;
    font-weight: 600;
    transition: background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.mode-option.is-active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.16);
}

.ai-player-control {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
}

.ai-player-control select {
    min-width: 5.6rem;
    border: 1px solid var(--glass-border);
    border-radius: calc(var(--radius-md) - 4px);
    background: #2f343b;
    color: #f8fafc;
    padding: 0.55rem 0.7rem;
    font: inherit;
}

.ai-player-control select option {
    background: #2f343b;
    color: #f8fafc;
}

.ai-player-control select:disabled,
#aiDifficultySelect:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.ai-status {
    min-width: 5rem;
    color: var(--text-muted);
    font-size: 0.82rem;
    text-align: center;
}

body.day-mode .mode-controls,
html.day-init .mode-controls {
    background: rgba(255, 255, 255, 0.62);
}

body.day-mode .mode-switch,
html.day-init .mode-switch {
    background: rgba(226, 232, 240, 0.8);
}

body.day-mode .mode-option.is-active,
html.day-init .mode-option.is-active {
    background: #ffffff;
}

body.day-mode .ai-player-control select,
html.day-init .ai-player-control select,
body.day-mode .ai-player-control select option,
html.day-init .ai-player-control select option {
    background: #ffffff;
    color: #1a202c;
}

.board.is-ai-turn .cell.legal {
    cursor: wait;
}

.board.is-ai-turn .cell.legal:hover {
    box-shadow: none;
}

@media (max-width: 720px) {
    .mode-controls,
    .mode-switch,
    .ai-player-control,
    .ai-player-control select,
    #aiDifficultySelect,
    .ai-status {
        width: 100%;
    }

    .mode-option {
        flex: 1;
    }
}