/* ==========================================
   MicroChess — Exercise Selection Menus
   Legal Destinations, Pathfinding, Captures
   ========================================== */

/* --- Shared Menu Layout --- */
.exercise-menu {
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
}

.exercise-menu__title {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.exercise-menu__sub {
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
    font-size: 0.9rem;
}

.exercise-menu__label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin: var(--space-lg) 0 var(--space-md);
}

/* --- Piece Grid --- */
.exercise-menu__pieces {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
    max-width: 380px;
    margin: 0 auto;
}

.exercise-menu__random {
    margin: var(--space-md) auto 0;
    max-width: 380px;
}

/* --- Piece Button --- */
.piece-btn {
    aspect-ratio: 1/1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.piece-btn:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.piece-btn--selected {
    border-color: var(--color-primary);
    background: rgba(74, 144, 217, 0.18);
    box-shadow: 0 0 14px rgba(74, 144, 217, 0.25);
}

.piece-btn__char {
    font-size: 2rem;
    line-height: 1;
}

.piece-btn--selected .piece-btn__char {
    color: var(--color-primary);
}

.piece-btn__name {
    font-size: 0.8rem;
    font-weight: 600;
}

/* --- Mode Cards (Pathfinding) --- */
.exercise-menu__modes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
    max-width: 380px;
    margin: 0 auto;
}

.mode-card {
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 14px var(--space-sm);
    text-align: center;
}

.mode-card--active {
    border-color: var(--color-success);
    box-shadow: 0 0 12px rgba(39, 174, 96, 0.2);
}

.mode-card--locked {
    opacity: 0.4;
}

.mode-card__icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
}

.mode-card__name {
    font-weight: 600;
    font-size: 0.85rem;
}

.mode-card__desc {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

/* --- Pathfinding Game Stats --- */
.pf-game__info {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin: var(--space-md) 0;
}

.pf-game__stat {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 5px 14px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* --- Mobile --- */
@media (max-width: 480px) {
    .piece-btn__char {
        font-size: 1.6rem;
    }

    .exercise-menu__modes {
        grid-template-columns: 1fr 1fr 1fr;
        gap: var(--space-xs);
    }
}

/* --- Single piece row (Queen alone) --- */
.exercise-menu__pieces--single {
    grid-template-columns: 1fr;
    max-width: 90px;
    margin: 10px auto 0;
}

/* --- Start button container --- */
.exercise-menu__start {
    text-align: center;
    margin-top: var(--space-xl);
}

/* --- Large button variant --- */
.btn--lg {
    padding: 13px 40px;
    font-size: 1.05rem;
}