/* ========================================
   MVidarr Button System
   Consistent, accessible button hierarchy
======================================== */

/* Base Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    
    /* Sizing */
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    
    /* Typography */
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    text-decoration: none;
    white-space: nowrap;
    
    /* Layout */
    border: 1px solid transparent !important;
    cursor: pointer;
    transition: all var(--transition-fast);
    
    /* Accessibility */
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
}

.btn:focus {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

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

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
}

.btn-xl {
    padding: var(--space-5) var(--space-8);
    font-size: calc(var(--font-size-base) * 1.125);
    font-weight: var(--font-weight-semibold);
}

/* Primary Button - Main Actions */
.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border-color: transparent !important;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--btn-primary-hover);
    border-color: transparent !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* Secondary Button - Supporting Actions */
.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border-color: transparent !important;
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--btn-secondary-hover);
    border-color: transparent !important;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px var(--secondary-shadow);
}

.btn-secondary:active {
    transform: translateY(0);
}

/* Tertiary Button - Subtle Actions */
.btn-tertiary {
    background-color: transparent;
    color: var(--text-secondary);
    border-color: var(--border-primary);
}

.btn-tertiary:hover:not(:disabled) {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

/* Ghost Button - Minimal Style */
.btn-ghost {
    background-color: transparent;
    color: var(--text-accent);
    border-color: transparent !important;
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--bg-tertiary);
    color: var(--text-accent);
}

/* Destructive Actions */
.btn-danger {
    background-color: var(--btn-danger-bg);
    color: var(--btn-danger-text);
    border-color: var(--btn-danger-bg);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--btn-danger-hover);
    border-color: var(--btn-danger-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--danger-shadow);
}

.btn-danger:active {
    transform: translateY(0);
}

/* Success Actions */
.btn-success {
    background-color: var(--success);
    color: white;
    border-color: transparent !important;
}

.btn-success:hover:not(:disabled) {
    background-color: var(--success-dark);
    border-color: transparent !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--success-shadow);
}

/* Info Actions */
.btn-info {
    background-color: var(--info);
    color: white;
    border-color: var(--info);
}

.btn-info:hover:not(:disabled) {
    background-color: var(--info-dark);
    border-color: var(--info-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--info-shadow);
}

/* Warning Actions */
.btn-warning {
    background-color: var(--warning);
    color: var(--text-inverse);
    border-color: var(--warning);
}

.btn-warning:hover:not(:disabled) {
    background-color: var(--warning-dark);
    border-color: var(--warning-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--warning-shadow);
}

/* Button Groups */
.btn-group {
    display: inline-flex;
    gap: var(--space-2);
    align-items: center;
}

.btn-group .btn {
    flex-shrink: 0;
}

.btn-group.btn-group-connected {
    gap: 0;
}

.btn-group.btn-group-connected .btn {
    border-radius: 0;
    border-right-width: 0;
}

.btn-group.btn-group-connected .btn:first-child {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.btn-group.btn-group-connected .btn:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    border-right-width: 1px;
}

.btn-group.btn-group-connected .btn:only-child {
    border-radius: var(--radius-md);
    border-right-width: 1px;
}

/* Action Groups for Organizing Related Buttons */
.action-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    align-items: center;
    margin-bottom: var(--space-4);
}

.action-group-primary {
    gap: var(--space-4);
}

.action-group-secondary {
    gap: var(--space-2);
}

.action-group-secondary .btn {
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-3);
}

/* Loading State */
.btn-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn-loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: button-loading 0.8s linear infinite;
}

@keyframes button-loading {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Icon Buttons */
.btn-icon {
    padding: var(--space-3);
    min-width: auto;
}

.btn-icon.btn-sm {
    padding: var(--space-2);
}

.btn-icon.btn-lg {
    padding: var(--space-4);
}

/* Full Width Button */
.btn-full {
    width: 100%;
    justify-content: center;
}

/* Floating Action Button */
.btn-fab {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 56px;
    height: 56px;
    padding: 0;
    border-radius: 50%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.btn-fab:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-group .btn {
        width: 100%;
    }
    
    .action-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .action-group .btn {
        width: 100%;
        justify-content: center;
    }
    
    .btn-fab {
        bottom: var(--space-4);
        right: var(--space-4);
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .btn {
        border-width: 2px;
    }
    
    .btn:focus {
        outline-width: 3px;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .btn {
        transition: none;
    }
    
    .btn:hover:not(:disabled) {
        transform: none;
    }
    
    .btn-loading::after {
        animation: none;
    }
}