/* === Button System ===
 * Single source of truth for reusable button styles.
 * Intent: Keep button behavior consistent across pages (shop, admin, landing).
 */

/* Base Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 12px 24px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    white-space: nowrap;

    /* Smooth micro-interactions (hover/press). */
    transition: transform 0.2s ease, box-shadow 0.2s ease;

    /* Hint for better animation smoothness on some browsers. */
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.btn:hover {
    transform: translateY(-2px) translateZ(0);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.45);
}

.btn:active {
    transform: scale(0.98) translateZ(0);
}

.btn:disabled {
    opacity: 0.5;
    pointer-events: none;
    cursor: not-allowed;
}

/* Size Variants */
.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
    border-radius: 8px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.1rem;
    border-radius: 14px;
}

/* Color Variants */
.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.45);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-success), #059669);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.45);
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-danger), #dc2626);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    box-shadow: 0 8px 24px rgba(239, 68, 68, 0.45);
}

.btn-warning {
    background: linear-gradient(135deg, var(--accent-warning), #d97706);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-warning:hover {
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.45);
}

/* Ghost/Outline Button */
.btn-ghost {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    box-shadow: none;
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-primary);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.15);
}

/* Plain Button (for admin panel) */
.btn-plain {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    box-shadow: none;
}

.btn-plain:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateZ(0);
}

/* Hero Button (larger) */
.btn-hero {
    padding: 16px 40px;
    font-size: 1.1rem;
    border-radius: 14px;
    min-width: 200px;
}

/* Icon Only Button */
.btn-icon {
    padding: 12px;
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.btn-icon.btn-sm {
    padding: 8px;
    width: 36px;
    height: 36px;
}

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

/* Login Button (special case for header) */
.btn-login {
    padding: 10px 24px;
    font-size: 0.95rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    border-radius: 10px;
    box-shadow: none;
}

.btn-login:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--accent-primary);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.2);
}