/**
 * GoStack Component Styles
 * Styling for buttons, forms, alerts, cards en generieke layout-helpers.
 */

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 500;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled,
.btn.loading {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--school-blue-deep, #0078B0); /* #91: AA-contrast */
    color: white;
}

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

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--border-color);
}

.btn-danger {
    background-color: var(--color-error);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--color-error-hover);
}

.btn-success {
    background-color: var(--color-success);
    color: white;
}

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

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
}

/* ==================== Forms ==================== */
.form {
    max-width: 500px;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* #95: verwijderd. Dit blok had een hogere specificiteit dan
   app.css .form-control:focus en forceerde het oude GoStack-blauw
   (#2563eb) terug; bovendien versloeg de outline:none de
   :focus-visible-toegankelijkheidsoutline. Focus-styling komt nu
   uitsluitend uit app.css (.form-control:focus / :focus-visible). */

.form-group input.invalid,
.form-group textarea.invalid,
.form-group select.invalid {
    border-color: var(--color-error);
}

.form-group input.invalid:focus,
.form-group textarea.invalid:focus,
.form-group select.invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-error {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-error);
}

.form-help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.form-group-checkbox {
    display: flex;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

/* ==================== Tabs ==================== */
.tabs {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

/* ==================== Layout Components ==================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

/* ==================== Loading States ==================== */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

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

/* Inline spinner in een knop (bv. publiceren) */
.btn-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    margin-right: var(--spacing-xs);
    vertical-align: -2px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

/* ==================== Alert ==================== */
.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border-left: 4px solid;
}

.alert-info {
    background-color: var(--color-info-light);
    border-left-color: var(--color-info);
    color: var(--color-info-dark);
}

.alert-success {
    background-color: var(--color-success-light);
    border-left-color: var(--color-success);
    color: var(--color-success-dark);
}

.alert-warning {
    background-color: var(--color-warning-light);
    border-left-color: var(--color-warning);
    color: var(--color-warning-dark);
}

.alert-error {
    background-color: var(--color-error-light);
    border-left-color: var(--color-error);
    color: var(--color-error-dark);
}

.alert-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 1px;
}

.alert-content {
    flex: 1;
    min-width: 0;
}

.alert-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.alert-message {
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.alert-dismiss {
    background: none;
    border: none;
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0.5;
    padding: 0;
    margin-left: auto;
    color: inherit;
    transition: opacity var(--transition-fast);
}

.alert-dismiss:hover {
    opacity: 1;
}

.alert-dismissing {
    animation: alertDismiss 0.3s ease forwards;
}

@keyframes alertDismiss {
    to {
        opacity: 0;
        transform: translateX(20px);
    }
}

/* Alert Banner */
.alert-banner {
    border-radius: 0;
    border-left: none;
    border-bottom: 1px solid;
}

.alert-banner-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    max-width: 1200px;
    margin: 0 auto;
    flex: 1;
}

.alert-banner .alert-message {
    font-size: var(--font-size-base);
}

/* ==================== Card (Extended) ==================== */
.card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.card-elevated {
    border: none;
    box-shadow: var(--shadow-lg);
}

.card-outlined {
    background-color: transparent;
}

.card-clickable {
    cursor: pointer;
    transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card-clickable:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-clickable:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.card-image {
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.card-header-content {
    flex: 1;
    min-width: 0;
}

.card-title {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.4;
}

.card-subtitle {
    margin: var(--spacing-xs) 0 0;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.card-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Collapsible Card */
.card-collapse-btn {
    padding: var(--spacing-xs);
}

.card-collapse-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.card-collapsed .card-collapse-icon {
    transform: rotate(-90deg);
}

.card-collapsed .card-body,
.card-collapsed .card-footer {
    display: none;
}

/* Card Loading */
.card-loading .card-body {
    min-height: 100px;
}

.card-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
}

/* Card Grid */
.card-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
    .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .card-grid-2,
    .card-grid-3,
    .card-grid-4 { grid-template-columns: 1fr; }
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    .content {
        padding: var(--spacing-md);
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
    }

    .form-actions {
        flex-direction: column;
    }
}