:root {
    --primary-color: #0053a0; /* eBay blue */
    --accent-color: #feba01; /* eBay yellow */
    --text-color: #333;
    --bg-color: #f4f4f4;
    --card-bg: #fff;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    background-color: var(--card-bg);
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.grid-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.listing-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.listing-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.15);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid #eee;
}

.card-content {
    padding: 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-price {
    font-size: 1.25rem;
    font-weight: bold;
    color: #333;
    margin-top: auto;
}

/* Modal Styling */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    overflow-y: auto;
}

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto;
    padding: 2rem;
    width: 90%;
    max-width: 1000px;
    border-radius: var(--border-radius);
    position: relative;
}

.close-button {
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    color: #666;
}

.close-button:hover {
    color: #000;
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .modal-body {
        grid-template-columns: 1fr;
    }
}

.modal-gallery {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.main-image-container {
    position: relative;
    width: 100%;
    height: 400px;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    overflow: hidden;
}

#modal-main-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.nav-button {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.7);
    border: none;
    padding: 1rem;
    cursor: pointer;
    border-radius: 50%;
    font-size: 1.2rem;
    transition: var(--transition);
}

.nav-button:hover {
    background: #fff;
}

.prev { left: 10px; }
.next { right: 10px; }

.thumbnail-container {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.thumbnail {
    width: 60px;
    height: 60px;
    object-fit: cover;
    cursor: pointer;
    border: 2px solid transparent;
    border-radius: 4px;
    transition: var(--transition);
}

.thumbnail.active {
    border-color: var(--primary-color);
}

.modal-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.price-tag {
    font-size: 2rem;
    font-weight: bold;
    color: #333;
}

.condition-tag, .seller-info {
    font-size: 0.95rem;
    color: #666;
}

.description-box {
    margin-top: 1rem;
    border-top: 1px solid #eee;
    padding-top: 1rem;
}

.ebay-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: #fff;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 25px;
    text-align: center;
    font-weight: bold;
    margin-top: 2rem;
    transition: var(--transition);
}

.ebay-button:hover {
    background-color: #004080;
    box-shadow: 0 4px 10px rgba(0,83,160,0.3);
}

.loader {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    font-size: 1.2rem;
    color: #666;
}