/* ========================================
   :has() Selector Feature Demos
   ======================================== */

/* Demo Description Styling */
.demo-description {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
    font-style: italic;
}

/* ========================================
   Demo 1: Form Validation with Parent Styling
   ======================================== */

.has-form-demo {
    max-width: 600px;
}

.form-group {
    position: relative;
    margin-bottom: var(--space-6);
    padding: var(--space-5);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: white;
    transition: all var(--transition-base);
}

.form-group label {
    display: block;
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
    color: var(--color-text);
    transition: color var(--transition-base);
}

.form-group input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
    transition: border-color var(--transition-base);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.error-text {
    display: none;
    color: var(--color-danger);
    font-size: var(--text-sm);
    margin-top: var(--space-2);
    font-weight: var(--font-medium);
}

/* :has() Magic: Style container when input is invalid and not empty */
.form-group:has(input:invalid:not(:placeholder-shown)) {
    border-color: var(--color-danger);
    background-color: #fee2e2;
}

/* :has() Magic: Style container when input is valid */
.form-group:has(input:valid:not(:placeholder-shown)) {
    border-color: var(--color-success);
    background-color: #f0fdf4;
}

/* :has() Magic: Style label based on input state */
.form-group:has(input:invalid:not(:placeholder-shown)) label {
    color: var(--color-danger);
    font-weight: var(--font-bold);
}

.form-group:has(input:valid:not(:placeholder-shown)) label {
    color: var(--color-success);
    font-weight: var(--font-bold);
}

/* :has() Magic: Show error message only when invalid */
.form-group:has(input:invalid:not(:placeholder-shown)) .error-text {
    display: block;
    animation: slideDown 0.3s ease-out;
}

/* :has() Magic: Change input border color */
.form-group:has(input:invalid:not(:placeholder-shown)) input {
    border-color: var(--color-danger);
}

.form-group:has(input:valid:not(:placeholder-shown)) input {
    border-color: var(--color-success);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Demo 2: Card Hover Effects
   ======================================== */

.has-cards-demo {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-6);
}

.product-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid var(--color-border);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.card-image {
    position: relative;
    overflow: hidden;
    background: var(--color-gray-100);
    cursor: pointer;
}

.card-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.card-content {
    padding: var(--space-5);
}

.card-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-2);
    color: var(--color-text);
    transition: all var(--transition-base);
}

.card-description {
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
}

.card-price {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.card-button {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-md);
    font-weight: var(--font-semibold);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
}

/* :has() Magic: Highlight card when image is hovered */
.product-card:has(.card-image:hover) {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: translateY(-8px);
    border-color: var(--color-primary);
}

/* :has() Magic: Scale up image on hover */
.product-card:has(.card-image:hover) .card-image img {
    transform: scale(1.1);
}

/* :has() Magic: Enlarge and color title on image hover */
.product-card:has(.card-image:hover) .card-title {
    font-size: 1.5rem;
    color: var(--color-primary);
}

/* :has() Magic: Show hidden button on image hover */
.product-card:has(.card-image:hover) .card-button {
    opacity: 1;
    pointer-events: auto;
}

.card-button:hover {
    background: var(--color-primary-dark);
    transform: scale(1.02);
}

/* ========================================
   Demo 3: Sibling Fade-Out Gallery
   ======================================== */

.has-gallery-demo {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
}

.gallery-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.gallery-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    color: white;
    padding: var(--space-4) var(--space-3);
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
    transition: padding var(--transition-base);
}

/* :has() Magic: Fade out all siblings when one is hovered */
.has-gallery-demo:has(.gallery-item:hover) .gallery-item:not(:hover) {
    opacity: 0.4;
    filter: grayscale(100%);
    transform: scale(0.95);
}

/* :has() Magic: Scale up the hovered item */
.gallery-item:hover {
    transform: scale(1.05);
    z-index: 10;
    box-shadow: var(--shadow-xl);
}

.gallery-item:hover .gallery-label {
    padding: var(--space-5) var(--space-4);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .has-cards-demo {
        grid-template-columns: 1fr;
    }

    .has-gallery-demo {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .has-gallery-demo {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Comparison Container Styling
   ======================================== */

.comparison-container {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
    border-left: 4px solid var(--color-primary);
}

.comparison-container h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.comparison-container h4 {
    color: var(--color-text);
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
    font-size: var(--text-lg);
}

.comparison-container p {
    margin-bottom: var(--space-4);
}

.comparison-container ul {
    list-style: none;
    padding-left: 0;
}

.comparison-container li {
    padding: var(--space-2) 0;
    color: var(--color-text);
    font-size: var(--text-base);
}

.comparison-container pre {
    margin-top: var(--space-4);
    margin-bottom: var(--space-6);
}