:root {
    --primary-color: #2c3e50;
    --secondary-color: #27ae60;
    --accent-color: #e67e22;
    --background-color: #f4f7f6;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-light: #7f8c8d;
    --shadow-sm: 0 2px 5px rgba(0,0,0,0.05);
    --shadow-md: 0 5px 15px rgba(0,0,0,0.1);
    --radius: 12px;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    background-color: var(--card-bg);
    padding: 2rem 1rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Filter Bar */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.filter-btn {
    background: var(--card-bg);
    border: 1px solid #ddd;
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Grid */
.pet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    padding-bottom: 4rem;
}

/* Card */
.pet-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.pet-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-image {
    height: 250px;
    width: 100%;
    object-fit: cover;
    background-color: #eee;
}

.card-content {
    padding: 1.5rem;
}

.pet-name {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.pet-breed {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    display: block;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.tag.dog { background-color: #e3f2fd; color: #1976d2; }
.tag.cat { background-color: #f3e5f5; color: #7b1fa2; }

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    padding: 1rem;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card-bg);
    width: 100%;
    max-width: 800px;
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    max-height: 90vh;
    animation: slideUp 0.3s ease;
}

@media (min-width: 768px) {
    .modal-content {
        flex-direction: row;
    }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255,255,255,0.8);
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.modal-image-container {
    flex: 1;
    min-height: 300px;
}

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

.modal-details {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.detail-row {
    margin-bottom: 1rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
}

.detail-label {
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.9rem;
    display: block;
    margin-bottom: 0.25rem;
}

.detail-value {
    font-size: 1.1rem;
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 600px) {
    .pet-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        flex-direction: column;
    }
}