/* ===============================================
   Button Components - Consolidated Styles
   =============================================== */

/* Base Button Styles
   ================================================ */
.btn {
    /* Layout */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;

    /* Sizing */
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    line-height: 1.5;
    white-space: nowrap;

    /* Appearance - Default is medium emphasis with subtle fill */
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;

    /* Interaction */
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    outline: none;
    user-select: none;
}

.btn:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

/* Button Variants
   ================================================ */
.btn-primary {
    background: var(--primary-color, #3498db);
    color: white;
    border-color: var(--primary-color, #3498db);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover, #2980b9);
    border-color: var(--primary-hover, #2980b9);
}

.btn-secondary {
    /* Outlined style - medium emphasis */
    background: transparent;
    color: var(--primary-color, #3498db);
    border: 1.5px solid var(--primary-color, #3498db);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(52, 152, 219, 0.1);
    border-color: var(--primary-hover, #2980b9);
    color: var(--primary-hover, #2980b9);
}

.btn-success {
    background: var(--success-color, #27ae60);
    color: white;
    border-color: var(--success-color, #27ae60);
}

.btn-success:hover:not(:disabled) {
    background: var(--success-hover, #229954);
    border-color: var(--success-hover, #229954);
}

.btn-danger {
    background: var(--danger-color, #e74c3c);
    color: white;
    border-color: var(--danger-color, #e74c3c);
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-hover, #c0392b);
    border-color: var(--danger-hover, #c0392b);
}

.btn-warning {
    background: var(--warning-color, #f39c12);
    color: white;
    border-color: var(--warning-color, #f39c12);
}

.btn-warning:hover:not(:disabled) {
    background: var(--warning-hover, #e67e22);
    border-color: var(--warning-hover, #e67e22);
}

/* Button Sizes
   ================================================ */
.btn-small,
.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    gap: 0.25rem;
}

.btn-large,
.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    gap: 0.75rem;
}

/* Icon Buttons
   ================================================ */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.btn-icon:hover:not(:disabled) {
    background: var(--bg-hover);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn-icon.btn-small,
.btn-icon-small {
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
}

.btn-icon.btn-large {
    width: 48px;
    height: 48px;
    font-size: 1.25rem;
}

/* Icon Button Variants */
.btn-icon.btn-primary {
    background: var(--primary-color, #3498db);
    color: white;
    border-color: var(--primary-color, #3498db);
}

.btn-icon.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover, #2980b9);
    border-color: var(--primary-hover, #2980b9);
}

.btn-icon.btn-danger {
    background: var(--danger-color, #e74c3c);
    color: white;
    border-color: var(--danger-color, #e74c3c);
}

.btn-icon.btn-danger:hover:not(:disabled) {
    background: var(--danger-hover, #c0392b);
    border-color: var(--danger-hover, #c0392b);
}

/* Special Button Styles
   ================================================ */
.btn-text {
    background: transparent;
    border: none;
    color: var(--primary-color, #3498db);
    padding: 0.25rem 0.5rem;
}

.btn-text:hover:not(:disabled) {
    background: rgba(52, 152, 219, 0.1);
    transform: none;
}

.btn-add {
    background: transparent;
    border: 1px dashed var(--border-color);
    color: var(--text-secondary);
}

.btn-add:hover:not(:disabled) {
    border-color: var(--primary-color, #3498db);
    color: var(--primary-color, #3498db);
    background: rgba(52, 152, 219, 0.05);
}

.btn-remove {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 24px;
    height: 24px;
    padding: 0;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.btn-remove:hover:not(:disabled) {
    background: var(--danger-color, #e74c3c);
    color: white;
    transform: none;
}

/* Button Groups
   ================================================ */
.btn-group {
    display: inline-flex;
    gap: 0.5rem;
}

.btn-group.btn-group-vertical {
    flex-direction: column;
}

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

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

.btn-group.btn-group-connected .btn:first-child {
    border-top-left-radius: 6px;
    border-bottom-left-radius: 6px;
}

.btn-group.btn-group-connected .btn:last-child {
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
}

.btn-group.btn-group-connected .btn:not(:first-child) {
    border-left: none;
}

/* Button States
   ================================================ */
.btn.loading {
    color: transparent;
    position: relative;
    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 var(--text-primary);
    border-radius: 50%;
    border-top-color: transparent;
    animation: btn-spinner 0.6s linear infinite;
}

@keyframes btn-spinner {
    to { transform: rotate(360deg); }
}

/* Animation Flash Effect */
.btn-success-flash {
    animation: success-flash 0.5s ease;
}

@keyframes success-flash {
    0%, 100% { background: var(--bg-secondary); }
    50% { background: var(--success-color, #27ae60); }
}

/* Theme Support (Light/Dark)
   ================================================ */
/* Light theme uses defaults from CSS variables already defined */
/* Dark theme only needs shadow adjustments since colors use variables */

body.dark-theme .btn,
[data-theme="dark"] .btn {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

body.dark-theme .btn:hover:not(:disabled),
[data-theme="dark"] .btn:hover:not(:disabled) {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* Responsive Design
   ================================================ */
@media (max-width: 768px) {
    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.9375rem;
    }
    
    .btn-small {
        padding: 0.375rem 0.75rem;
        font-size: 0.8125rem;
    }
}