/* ===== Button Styles ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 12px 24px;
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    font-family: var(--font-sans);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast),
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.btn-primary {
    background-color: var(--color-burgundy);
    color: var(--color-white);
    position: relative;
    isolation: isolate;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    background-image: var(--texture-ruby-garnet);
    background-size: cover;
    background-position: center;
    mix-blend-mode: soft-light;
    opacity: 0.35;
    pointer-events: none;
    border-radius: inherit;
    transition: opacity var(--transition-base), background-position var(--transition-base);
}

@media (hover: hover) {
    .btn-primary:hover:not(:disabled) {
        background-color: var(--color-burgundy-light);
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }

    .btn-primary:hover:not(:disabled)::before {
        opacity: 0.5;
        background-position: 10% center;
    }
}

.btn-primary:active:not(:disabled) {
    transform: translateY(1px);
    box-shadow: var(--shadow-sm);
}

.btn-primary:active:not(:disabled)::before {
    opacity: 0.25;
    filter: brightness(0.85);
}

.btn-primary:disabled::before {
    filter: grayscale(1);
    opacity: 0.15;
}

.btn-secondary {
    background-color: var(--color-gray-100);
    color: var(--color-gray-900);
}

@media (hover: hover) {
    .btn-secondary:hover:not(:disabled) {
        background-color: var(--color-gray-200);
        transform: translateY(-2px);
        box-shadow: var(--shadow-sm);
    }
}

.btn-secondary:active:not(:disabled) {
    transform: translateY(1px);
    box-shadow: none;
}

.btn-lg {
    width: 100%;
    height: 56px;
    padding: 16px 32px;
    font-size: var(--text-lg);
}

/* Idle glow pulse — large CTA buttons only */
.btn-primary.btn-lg::before {
    animation: texture-glow-pulse 3s ease-in-out infinite;
}

.btn[aria-busy='true'] .btn-text {
    opacity: 0.5;
}

.btn[aria-busy='true']::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid rgb(255 255 255 / 30%);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-left: var(--space-2);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}