/* 自定义变量 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --light-color: #f8f9fa;
    --dark-color: #2c3e50;
    --gray-color: #95a5a6;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* 全局重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}


/* 基础样式 --------------------------------------------------- */
body {
    background-color: #ffffff;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}


/* 上边栏样式 --------------------------------------------------- */
.top-bar {
    background-color: var(--dark-color);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-left {
    display: flex;
    align-items: center;
    gap: 30px;
}

/* 网站logo */
.logo {
    font-size: 28px;
    font-weight: bold;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

/* 类别菜单按钮 */
.categories-dropdown {
    position: relative;
    display: inline-block;
}

.categories-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.categories-btn.active {
    background-color: #2980b9;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 下拉菜单 */
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: white;
    min-width: 200px;
    box-shadow: var(--shadow);
    border-radius: 5px;
    z-index: 1001;
    margin-top: 5px;
    border: 1px solid var(--border-color);
}

.dropdown-menu.show {
    display: block;
}

.dropdown-item {
    display: block;
    padding: 12px 20px;
    color: var(--dark-color);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
}

/* 购物车 */
.cart-container {
    position: relative;
}

.cart-toggle {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    position: relative;
    padding: 10px;
    z-index: 1002;
}

.cart-count {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: var(--accent-color);
    color: white;
    font-size: 12px;
    min-width: 20px;
    height: 20px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 6px;
}

/* 购物清单界面 */
.cart-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    width: 350px;
    background-color: white;
    box-shadow: var(--shadow);
    border-radius: 0 0 8px 8px;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    border: 1px solid var(--border-color);
    border-top: none;
    max-height: 70vh;
    overflow-y: auto;
}

/* 悬停时显示购物车 */
.cart-container:hover .cart-dropdown,
.cart-dropdown.persistent-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.cart-header {
    color: var(--dark-color);
    padding: 15px 20px;
    border-radius: 8px 8px 0 0;
    font-size: 16px;
    font-weight: 600;
}

.cart-content {
    padding: 20px;
}

.cart-items {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 10px;
}

.cart-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.cart-item:last-child {
    border-bottom: none;
}

.cart-item-name {
    flex: 1;
    font-weight: 600;
    color: var(--dark-color);
    font-size: 14px;
    margin-right: 10px;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 0px;
}

.quantity-input {
    width: 60px;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 6px;
    font-size: 14px;
}

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

.cart-item-price {
    min-width: 60px;
    text-align: right;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 14px;
    margin: 0 15px;
}

.remove-item {
    background: none;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    font-size: 18px;
    padding: 0 5px;
    line-height: 1;
    transition: var(--transition);
}

.remove-item:hover {
    color: #c0392b;
}

/* 空购物车状态 */
.empty-cart {
    text-align: center;
    padding: 30px 20px;
    color: var(--gray-color);
}

.empty-cart p {
    margin: 0;
    font-size: 14px;
}

/* 总计和结账按钮 */
.cart-footer {
    border-top: 2px solid var(--border-color);
    padding-top: 15px;
}

.cart-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    font-size: 16px;
    font-weight: 600;
}

.cart-total span:first-child {
    color: var(--dark-color);
}

.total-price {
    color: var(--primary-color);
    font-size: 18px;
}

.checkout-btn {
    width: 100%;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 12px;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
}

.checkout-btn:hover {
    background-color: #27ae60;
}

.checkout-btn:disabled {
    background-color: var(--gray-color);
    cursor: not-allowed;
}


/* 导航栏样式 --------------------------------------------------- */
.breadcrumb-nav {
    background-color: var(--light-color);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
}

.breadcrumb li {
    display: flex;
    align-items: center;
}

.breadcrumb li:not(:last-child)::after {
    content: ">";
    margin: 0 10px;
    color: var(--gray-color);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb li:last-child {
    color: var(--dark-color);
    font-weight: bold;
}


/* 主体部分样式 ---------------------------------------------------- */
.main-content {
    flex-grow: 1;
    padding: 40px 0;
}

.category-section {
    margin-bottom: 50px;
}

.category-title {
    font-size: 24px;
    color: var(--dark-color);
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

/* 产品列表 */
.product-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    justify-content: flex-start;
}

.product-card {
    flex: 0 0 calc(25% - 25px);
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.product-link {
    text-decoration: none;
    color: inherit;
}

.product-image {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    overflow: hidden;
    border-radius: 5px;
}

.product-thumbnail {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.product-name {
    font-size: 18px;
    font-weight: bold;
    color: var(--dark-color);
}

.product-price {
    font-size: 20px;
    color: var(--primary-color);
    font-weight: bold;
    margin: 10px 0;
    flex-grow: 1;
}

.add-to-cart {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.add-to-cart:hover {
    background-color: #27ae60;
}


/* 商品信息页面样式 ------------------------------------------------ */
.product-detail {
    flex-grow: 1;
    padding: 40px 0;
}

.product-detail-container {
    display: flex;
    gap: 50px;
    align-items: flex-start;
}

.product-image-section {
    flex: 1;
}

.main-image {
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.main-image img {
    width: 100%;
    height: auto;
    border-radius: 5px;
}

.product-info-section {
    flex: 1;
}

.product-detail-name {
    font-size: 32px;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.product-detail-price {
    font-size: 28px;
    color: var(--primary-color);
    font-weight: bold;
    margin-bottom: 30px;
}

.product-description {
    margin-bottom: 30px;
    line-height: 1.8;
}

.add-to-cart-section {
    margin-top: 50px;
}

.add-to-cart-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
    width: 50%;
}

.add-to-cart-btn:hover {
    background-color: #27ae60;
}


/* 页脚 ---------------------------------------------------------- */
.site-footer {
    background-color: var(--dark-color);
    color: white;
    padding: 20px 0;
    margin-top: 50px;
}

.site-footer .container {
    text-align: center;
}