:root {
    /* Светлая тема */
    --bg-primary: #ffffff;
    --bg-secondary: #f4f6f9;
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-color: #0077cc;
    --card-bg: #ffffff;
    --card-shadow: rgba(0,0,0,0.1);
    --filter-bg: #f8f9fa;
    --border-color: #e0e0e0;

    /* Темная тема */
    --dark-bg-primary: #121212;
    --dark-bg-secondary: #1e1e1e;
    --dark-text-primary: #e0e0e0;
    --dark-text-secondary: #a0a0a0;
    --dark-accent-color: #4da6ff;
    --dark-card-bg: #252525;
    --dark-card-shadow: rgba(255,255,255,0.05);
    --dark-filter-bg: #1c1c1c;
    --dark-border-color: #444;
}

/* Базовые стили темы */
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
    font-family: 'Arial', sans-serif;
}

body.dark-theme {
    background-color: var(--dark-bg-primary);
    color: var(--dark-text-primary);
}

/* Контейнер каталога */
.catalog-container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Фильтры */
.filters {
    width: 250px;
    background-color: var(--filter-bg);
    padding: 20px;
    border-radius: 12px;
    margin-right: 20px;
    transition: background-color 0.3s;
}

body.dark-theme .filters {
    background-color: var(--dark-filter-bg);
}

.filter-form {
    display: flex;
    flex-direction: column;
}

.filter-form label {
    margin-top: 10px;
    font-weight: bold;
}

.filter-form select,
.filter-form input {
    margin-bottom: 15px;
    padding: 8px;
    border: 1px solid var(--text-secondary);
    border-radius: 6px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

body.dark-theme .filter-form select,
body.dark-theme .filter-form input {
    background-color: var(--dark-bg-secondary);
    border-color: var(--dark-text-secondary);
    color: var(--dark-text-primary);
}

.filter-form button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.filter-form button:hover {
    background-color: #005fa3;
}

/* Список товаров */
.product-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    width: 100%;
    flex-grow: 1;
}

.product-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: scale(1.03);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.product-card a {
    display: block;
    text-decoration: none;
    color: var(--text-primary);
}

.product-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.product-card h3 {
    padding: 10px;
    margin: 0;
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.product-card p {
    padding: 0 10px 10px;
    font-weight: bold;
    color: var(--accent-color);
}

body.dark-theme .product-card {
    background-color: var(--dark-card-bg);
    border-color: var(--dark-border-color);
    box-shadow: 0 4px 15px var(--dark-card-shadow);
}

body.dark-theme .product-card a {
    color: var(--dark-text-primary);
}

body.dark-theme .product-card p {
    color: var(--dark-accent-color);
}

/* Загрузчик */
.loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 20px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Адаптивность */
@media (max-width: 1200px) {
    .product-list {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .catalog-container {
        flex-direction: column;
    }

    .filters {
        width: 100%;
        margin-right: 0;
        margin-bottom: 20px;
    }

    .product-list {
        grid-template-columns: repeat(2, 1fr);
    }

    .product-card img {
        height: 180px;
    }
}

@media (max-width: 480px) {
    .product-list {
        grid-template-columns: 1fr;
    }
}