/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--radius-base);
    cursor: pointer;
    text-decoration: none;
    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
    white-space: nowrap;
    user-select: none;
    -webkit-user-select: none;
}

.btn:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* -------------------------------------------------------------------------- */
/* Primary — purple filled                                                      */
/* -------------------------------------------------------------------------- */
.btn--primary {
    background: var(--color-purple);
    border-color: var(--color-purple);
    color: #fff;
}

.btn--primary:hover {
    background: var(--color-purple-dark);
    border-color: var(--color-purple-dark);
    box-shadow: var(--shadow-purple-glow);
    transform: translateY(-1px);
}

.btn--primary:active {
    background: var(--color-purple-deeper);
    transform: translateY(0);
}

/* -------------------------------------------------------------------------- */
/* Ghost — transparent with purple border                                       */
/* -------------------------------------------------------------------------- */
.btn--ghost {
    background: transparent;
    border-color: var(--color-purple);
    color: var(--color-purple-light);
}

.btn--ghost:hover {
    background: rgba(155, 81, 224, 0.12);
    border-color: var(--color-purple-light);
    color: var(--color-purple-light);
}

/* -------------------------------------------------------------------------- */
/* Stone — neutral muted button                                                 */
/* -------------------------------------------------------------------------- */
.btn--stone {
    background: var(--color-vault-raised);
    border-color: var(--color-olive-deep);
    color: var(--color-text-secondary);
}

.btn--stone:hover {
    background: var(--color-charcoal);
    border-color: var(--color-olive-mid);
    color: var(--color-text-primary);
}

/* -------------------------------------------------------------------------- */
/* Gold — accent CTA                                                            */
/* -------------------------------------------------------------------------- */
.btn--gold {
    background: var(--color-gold);
    border-color: var(--color-gold);
    color: var(--color-obsidian);
}

.btn--gold:hover {
    background: var(--color-gold-deep);
    border-color: var(--color-gold-deep);
    box-shadow: var(--shadow-gold-glow);
    transform: translateY(-1px);
}

/* -------------------------------------------------------------------------- */
/* Danger                                                                       */
/* -------------------------------------------------------------------------- */
.btn--danger {
    background: var(--color-error);
    border-color: var(--color-error);
    color: #fff;
}

.btn--danger:hover {
    background: #a93226;
    border-color: #a93226;
}

/* -------------------------------------------------------------------------- */
/* Sizes                                                                        */
/* -------------------------------------------------------------------------- */
.btn--sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

.btn--xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
}

/* Full width */
.btn--full { width: 100%; }

/* Icon only */
.btn--icon {
    padding: var(--space-2);
    width: 36px;
    height: 36px;
}

/* -------------------------------------------------------------------------- */
/* Add to cart — special state                                                  */
/* -------------------------------------------------------------------------- */
.btn--add-to-cart.added {
    background: var(--color-success);
    border-color: var(--color-success);
    pointer-events: none;
}

.btn--add-to-cart.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn--add-to-cart.loading::after {
    content: '';
    position: absolute;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}