/* 
 * Modern Button System for MyLesson.AI
 * Consistent, professional button styles across the application
 */

/* ============================================
   Color Scheme
   ============================================ */
:root {
    --btn-primary: #6366f1;
    --btn-primary-hover: #4f46e5;
    --btn-primary-active: #4338ca;
    
    --btn-secondary: #8b5cf6;
    --btn-secondary-hover: #7c3aed;
    --btn-secondary-active: #6d28d9;
    
    --btn-success: #10b981;
    --btn-success-hover: #059669;
    --btn-success-active: #047857;
    
    --btn-danger: #ef4444;
    --btn-danger-hover: #dc2626;
    --btn-danger-active: #b91c1c;
    
    --btn-warning: #f59e0b;
    --btn-warning-hover: #d97706;
    --btn-warning-active: #b45309;
    
    --btn-info: #3b82f6;
    --btn-info-hover: #2563eb;
    --btn-info-active: #1d4ed8;
    
    --btn-gray: #6b7280;
    --btn-gray-hover: #4b5563;
    --btn-gray-active: #374151;
    
    --btn-outline-border: #e5e7eb;
    --btn-outline-hover-bg: #f9fafb;
    
    --btn-text-color: #ffffff;
    --btn-text-dark: #1f2937;
}

/* ============================================
   Base Button Styles
   ============================================ */
.btn {
    font-weight: 500;
    border-radius: 8px;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    line-height: 1.5;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn:disabled,
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ============================================
   Button Sizes
   ============================================ */
.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 10px;
    font-weight: 600;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    border-radius: 6px;
}

.btn-xs {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 6px;
}

/* ============================================
   Primary Button (Main Actions)
   ============================================ */
.btn-primary {
    background: linear-gradient(135deg, var(--btn-primary) 0%, var(--btn-secondary) 100%);
    color: var(--btn-text-color);
    border-color: transparent;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--btn-primary-hover) 0%, var(--btn-secondary-hover) 100%);
    color: var(--btn-text-color);
    border-color: transparent;
}

.btn-primary:active,
.btn-primary.active {
    background: linear-gradient(135deg, var(--btn-primary-active) 0%, var(--btn-secondary-active) 100%);
    color: var(--btn-text-color);
}

.btn-primary:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* ============================================
   Secondary Button
   ============================================ */
.btn-secondary {
    background-color: var(--btn-secondary);
    color: var(--btn-text-color);
    border-color: var(--btn-secondary);
}

.btn-secondary:hover {
    background-color: var(--btn-secondary-hover);
    border-color: var(--btn-secondary-hover);
    color: var(--btn-text-color);
}

.btn-secondary:active,
.btn-secondary.active {
    background-color: var(--btn-secondary-active);
    border-color: var(--btn-secondary-active);
    color: var(--btn-text-color);
}

/* ============================================
   Success Button
   ============================================ */
.btn-success {
    background-color: var(--btn-success);
    color: var(--btn-text-color);
    border-color: var(--btn-success);
}

.btn-success:hover {
    background-color: var(--btn-success-hover);
    border-color: var(--btn-success-hover);
    color: var(--btn-text-color);
}

.btn-success:active,
.btn-success.active {
    background-color: var(--btn-success-active);
    border-color: var(--btn-success-active);
    color: var(--btn-text-color);
}

/* ============================================
   Danger Button
   ============================================ */
.btn-danger {
    background-color: var(--btn-danger);
    color: var(--btn-text-color);
    border-color: var(--btn-danger);
}

.btn-danger:hover {
    background-color: var(--btn-danger-hover);
    border-color: var(--btn-danger-hover);
    color: var(--btn-text-color);
}

.btn-danger:active,
.btn-danger.active {
    background-color: var(--btn-danger-active);
    border-color: var(--btn-danger-active);
    color: var(--btn-text-color);
}

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

.btn-warning:hover {
    background-color: var(--btn-warning-hover);
    border-color: var(--btn-warning-hover);
    color: var(--btn-text-color);
}

.btn-warning:active,
.btn-warning.active {
    background-color: var(--btn-warning-active);
    border-color: var(--btn-warning-active);
    color: var(--btn-text-color);
}

/* ============================================
   Info Button
   ============================================ */
.btn-info {
    background-color: var(--btn-info);
    color: var(--btn-text-color);
    border-color: var(--btn-info);
}

.btn-info:hover {
    background-color: var(--btn-info-hover);
    border-color: var(--btn-info-hover);
    color: var(--btn-text-color);
}

.btn-info:active,
.btn-info.active {
    background-color: var(--btn-info-active);
    border-color: var(--btn-info-active);
    color: var(--btn-text-color);
}

/* ============================================
   Gray/Neutral Button
   ============================================ */
.btn-gray,
.btn-gray-600,
.btn-gray-800 {
    background-color: var(--btn-gray);
    color: var(--btn-text-color);
    border-color: var(--btn-gray);
}

.btn-gray:hover,
.btn-gray-600:hover,
.btn-gray-800:hover {
    background-color: var(--btn-gray-hover);
    border-color: var(--btn-gray-hover);
    color: var(--btn-text-color);
}

.btn-gray:active,
.btn-gray-600:active,
.btn-gray-800:active,
.btn-gray.active,
.btn-gray-600.active,
.btn-gray-800.active {
    background-color: var(--btn-gray-active);
    border-color: var(--btn-gray-active);
    color: var(--btn-text-color);
}

/* ============================================
   Outline Buttons
   ============================================ */
.btn-outline-primary {
    background-color: transparent;
    color: var(--btn-primary);
    border-color: var(--btn-primary);
}

.btn-outline-primary:hover {
    background-color: var(--btn-primary);
    color: var(--btn-text-color);
    border-color: var(--btn-primary);
}

.btn-outline-secondary {
    background-color: transparent;
    color: var(--btn-secondary);
    border-color: var(--btn-secondary);
}

.btn-outline-secondary:hover {
    background-color: var(--btn-secondary);
    color: var(--btn-text-color);
    border-color: var(--btn-secondary);
}

.btn-outline-gray,
.btn-outline-gray-600 {
    background-color: transparent;
    color: var(--btn-gray);
    border-color: var(--btn-outline-border);
}

.btn-outline-gray:hover,
.btn-outline-gray-600:hover {
    background-color: var(--btn-outline-hover-bg);
    color: var(--btn-gray-hover);
    border-color: var(--btn-gray);
}

.btn-outline-success {
    background-color: transparent;
    color: var(--btn-success);
    border-color: var(--btn-success);
}

.btn-outline-success:hover {
    background-color: var(--btn-success);
    color: var(--btn-text-color);
    border-color: var(--btn-success);
}

.btn-outline-danger {
    background-color: transparent;
    color: var(--btn-danger);
    border-color: var(--btn-danger);
}

.btn-outline-danger:hover {
    background-color: var(--btn-danger);
    color: var(--btn-text-color);
    border-color: var(--btn-danger);
}

/* ============================================
   Link Buttons
   ============================================ */
.btn-link {
    background-color: transparent;
    border-color: transparent;
    color: var(--btn-primary);
    text-decoration: none;
    box-shadow: none;
    padding: 0.375rem 0.5rem;
}

.btn-link:hover {
    background-color: transparent;
    color: var(--btn-primary-hover);
    text-decoration: underline;
    transform: none;
    box-shadow: none;
}

.btn-link:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* ============================================
   Icon Buttons
   ============================================ */
.btn .icon,
.btn svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

.btn-sm .icon,
.btn-sm svg {
    width: 0.875rem;
    height: 0.875rem;
}

.btn-xs .icon,
.btn-xs svg {
    width: 0.75rem;
    height: 0.75rem;
}

.btn-lg .icon,
.btn-lg svg {
    width: 1.125rem;
    height: 1.125rem;
}

/* ============================================
   Button Groups
   ============================================ */
.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: 8px;
    border-bottom-left-radius: 8px;
}

.btn-group .btn:last-child {
    border-top-right-radius: 8px;
    border-bottom-right-radius: 8px;
}

/* ============================================
   Loading States
   ============================================ */
.btn .spinner-border,
.btn .spinner-border-sm {
    border-width: 2px;
}

.btn-sm .spinner-border-sm {
    width: 0.875rem;
    height: 0.875rem;
    border-width: 1.5px;
}

/* ============================================
   Legacy Button Class Overrides
   ============================================ */
/* Ensure all gray button variants use the same style */
.btn-gray-800,
.btn-gray-600 {
    background-color: var(--btn-gray);
    color: var(--btn-text-color);
    border-color: var(--btn-gray);
}

.btn-gray-800:hover,
.btn-gray-600:hover {
    background-color: var(--btn-gray-hover);
    border-color: var(--btn-gray-hover);
    color: var(--btn-text-color);
}

.btn-gray-800:active,
.btn-gray-600:active,
.btn-gray-800.active,
.btn-gray-600.active {
    background-color: var(--btn-gray-active);
    border-color: var(--btn-gray-active);
    color: var(--btn-text-color);
}

/* Override any existing gradient styles */
.btn-gray-800 {
    background: var(--btn-gray) !important;
    border-color: var(--btn-gray) !important;
}

.btn-gray-800:hover {
    background: var(--btn-gray-hover) !important;
    border-color: var(--btn-gray-hover) !important;
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 576px) {
    .btn {
        padding: 0.5625rem 1rem;
        font-size: 0.8125rem;
    }
    
    .btn-lg {
        padding: 0.6875rem 1.25rem;
        font-size: 0.9375rem;
    }
}