/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #333;
    background-color: #f4f4f4;
}

a {
    text-decoration: none;
    color: #333;
}

a:hover {
    color: #ff4400;
}

ul, li {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

/* 通用容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 通用头部样式 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo img {
    height: 40px;
}

/* 导航样式优化 */
.nav {
    border-bottom: 1px solid #eee;
    background: #fff;
}

.nav ul {
    display: flex;
    gap: 30px;
    padding: 0;
    margin: 0;
    height: 50px;
}

.nav li {
    position: relative;
}

.nav a {
    display: flex;
    align-items: center;
    height: 50px;
    padding: 0 15px;
    color: #333;
    font-size: 16px;
    transition: all 0.3s ease;
}

.nav a:hover {
    color: #ff4400;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: #ff4400;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

.nav a.active {
    color: #ff4400;
    font-weight: bold;
}

/* 通用页脚样式 */
.footer {
    background-color: #fff;
    padding: 40px 0 20px;
    margin-top: 40px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}

.footer-section {
    flex: 1;
    padding: 0 15px;
}

.footer-section h3 {
    font-size: 16px;
    margin-bottom: 15px;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #666;
}

/* 通用按钮样式 */
.btn {
    display: inline-block;
    padding: 8px 20px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background-color: #ff4400;
    color: #fff;
}

.btn-primary:hover {
    background-color: #ff5500;
}

/* 通用表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #666;
}

.form-group input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.form-group input:focus {
    border-color: #ff4400;
    outline: none;
}

/* 通用搜索框样式 */
.search {
    display: flex;
    align-items: center;
}

.search input {
    width: 400px;
    padding: 8px 12px;
    border: 2px solid #ff4400;
    border-radius: 4px 0 0 4px;
    font-size: 14px;
}

.search button {
    padding: 8px 20px;
    background-color: #ff4400;
    color: #fff;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

.search button:hover {
    background-color: #ff5500;
}

/* 通用用户信息样式 */
.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info a {
    color: #666;
}

.user-info .cart {
    color: #ff4400;
}

/* 通用标题样式 */
.section-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #ff4400;
}

/* 通用卡片样式 */
.card {
    background-color: #fff;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 15px;
    margin-bottom: 20px;
}

/* 通用网格布局 */
.grid {
    display: grid;
    gap: 20px;
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* 通用动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-in;
}

/* 通用加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #ff4400;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 通用提示框样式 */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltip-text {
    visibility: hidden;
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 5px 10px;
    border-radius: 4px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* 通用响应式布局 */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        flex-direction: column;
    }

    .footer-section {
        margin-bottom: 20px;
    }

    .search input {
        width: 200px;
    }
}

@media (max-width: 480px) {
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .header-top {
        flex-direction: column;
        gap: 10px;
    }

    .nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
}