:root {
    --primary-color: #003E8F;  /* 中大蓝 */
    --secondary-color: #2674E3; /* 浅蓝色 */
    --accent-color: #E54028;   /* 点缀红色 */
    --text-color: #333333;
    --text-light: #666666;
    --background-color: #F5F7FA;
    --card-background: #FFFFFF;
    --card-shadow: 0 4px 12px rgba(0, 62, 143, 0.08);
    --gradient-blue: linear-gradient(135deg, #003E8F 0%, #2674E3 100%);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 0;
    background: var(--card-background);
    box-shadow: var(--card-shadow);
    margin-bottom: 30px;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 2.5em;
    font-weight: 600;
    letter-spacing: -0.5px;
}

h2 {
    color: var(--text-color);
    margin: 20px 0;
    font-size: 1.8em;
    font-weight: 600;
}

.search-box {
    display: flex;
    justify-content: center;
    gap: 10px;
    max-width: 600px;
    margin: 0 auto;
}

#searchInput {
    flex: 1;
    padding: 12px 20px;
    font-size: 16px;
    border: 2px solid #e1e8f0;
    border-radius: 25px;
    outline: none;
    transition: all 0.3s ease;
}

#searchInput:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(38, 116, 227, 0.1);
}

#searchButton {
    background: var(--gradient-blue);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 62, 143, 0.2);
}

#searchButton:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 62, 143, 0.3);
}

.category-nav {
    margin: 20px 0;
    padding: 15px;
    background: var(--gradient-blue);
    border-radius: 8px;
}

.category-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    padding: 0;
}

.category-nav li {
    margin: 5px;
}

.category-nav a {
    display: inline-block;
    padding: 8px 20px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.category-nav a:hover,
.category-nav a.active {
    background-color: white;
    color: var(--primary-color);
}

.popular-section {
    background: var(--card-background);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    margin: 40px 0;
}

.popular-section h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #e1e8f0;
    border-top: 5px solid var(--secondary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    padding: 20px 0;
}

.product-card {
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 62, 143, 0.12);
}

.product-image {
    width: 100%;
    height: 300px;
    object-fit: contain;
    background: #f8f9fa;
    padding: 20px;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image {
    transform: scale(1.05);
}

.product-info {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-title {
    font-size: 1.1em;
    margin-bottom: 15px;
    color: var(--text-color);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
    font-weight: 500;
}

.price-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.original-price {
    color: var(--text-light);
    text-decoration: line-through;
    font-size: 0.9em;
}

.final-price {
    color: var(--accent-color);
    font-size: 1.3em;
    font-weight: bold;
}

.coupon-info {
    background-color: rgba(229, 64, 40, 0.1);
    color: var(--accent-color);
    padding: 10px;
    border-radius: 6px;
    text-align: center;
    margin-bottom: 15px;
    font-weight: 500;
}

.buy-btn {
    display: block;
    width: 100%;
    background: var(--gradient-blue);
    color: white;
    text-align: center;
    padding: 12px;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
    margin-top: auto;
}

.buy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 62, 143, 0.2);
}

.no-results {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
    font-size: 1.2em;
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.error-message {
    text-align: center;
    padding: 40px;
    color: var(--accent-color);
    background: rgba(229, 64, 40, 0.1);
    border-radius: 12px;
    margin: 20px 0;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin: 30px 0;
    padding: 20px;
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.page-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    background: var(--gradient-blue);
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--text-light);
}

.page-btn:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 62, 143, 0.2);
}

.page-numbers {
    display: flex;
    gap: 10px;
    align-items: center;
}

.page-number {
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--background-color);
    color: var(--text-color);
}

.page-number.active {
    background: var(--primary-color);
    color: white;
}

.page-number:hover:not(.active) {
    background: var(--secondary-color);
    color: white;
}

footer {
    text-align: center;
    padding: 20px;
    color: var(--text-light);
    margin-top: 40px;
    background: var(--card-background);
    box-shadow: var(--card-shadow);
}

@media (max-width: 1024px) {
    .results {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .pagination {
        flex-direction: column;
        gap: 15px;
        margin: 15px;
        padding: 15px;
    }

    .page-numbers {
        flex-wrap: wrap;
        justify-content: center;
    }

    .page-btn {
        width: 100%;
        justify-content: center;
    }
    .container {
        padding: 10px;
    }

    header {
        padding: 20px 0;
    }

    .search-box {
        flex-direction: column;
        padding: 0 15px;
    }

    #searchButton {
        width: 100%;
    }

    .category-nav {
        margin: 15px;
    }

    .popular-section {
        margin: 15px;
        padding: 15px;
    }

    .container {
        padding: 10px;
    }

    .results {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 15px;
    }

    .popular-section {
        padding: 15px;
    }

    .product-image {
        height: 250px;
    }
}