/* 学生线上商城系统样式文件 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* 头部样式 */
.header {
    background: linear-gradient(45deg, #000 0%, #111 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.header h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.header p {
    text-align: center;
    opacity: 0.9;
}

/* 导航样式 */
.nav {
    background: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav a:hover, .nav a.active {
    background: #111;
    color: white;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 2rem;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: #111;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    text-align: center;
}

.btn:hover {
    background: #222;
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
}

.btn-success:hover {
    background: #218838;
}

.btn-danger {
    background: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
}

.btn-warning {
    background: #ffc107;
    color: #333;
}

.btn-warning:hover {
    background: #e0a800;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* 产品网格 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.product-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
}

.product-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: #f8f9fa;
}

.product-info {
    padding: 1rem;
}

.product-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #333;
}

.product-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: #e74c3c;
    margin-bottom: 1rem;
}

.product-actions {
    display: flex;
    gap: 0.5rem;
}

/* 购物车样式 */
.cart-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #eee;
}

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

.cart-item-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 5px;
    margin-right: 1rem;
}

.cart-item-info {
    flex: 1;
}

.cart-item-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.cart-item-price {
    color: #e74c3c;
    font-weight: 600;
}

.cart-item-quantity {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 1rem;
}

.quantity-btn {
    width: 30px;
    height: 30px;
    border: 1px solid #ddd;
    background: white;
    cursor: pointer;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.quantity-btn:hover {
    background: #f8f9fa;
}

.cart-total {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    text-align: right;
}

.cart-total-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: #e74c3c;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #555;
}

.table tr:hover {
    background: #f8f9fa;
}

/* 状态标签 */
.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-pending {
    background: #fff3cd;
    color: #856404;
}

.status-confirmed {
    background: #d4edda;
    color: #155724;
}

.status-delivered {
    background: #cce5ff;
    color: #004085;
}

.status-completed {
    background: #d1ecf1;
    color: #0c5460;
}

.status-cancelled {
    background: #f8d7da;
    color: #721c24;
}

/* 分类标签 */
.category-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.category-tab {
    padding: 0.75rem 1.5rem;
    background: white;
    border: 2px solid #ddd;
    border-radius: 25px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: all 0.3s ease;
}

.category-tab:hover,
.category-tab.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }
    
    .nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }
    
    .cart-item {
        flex-direction: column;
        text-align: center;
    }
    
    .cart-item-image {
        margin-right: 0;
        margin-bottom: 1rem;
    }
    
    .category-tabs {
        justify-content: center;
    }
}

/* 消息提示 */
.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 隐藏元素 */
.hidden {
    display: none;
}

/* 文本对齐 */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-left {
    text-align: left;
}

/* 边距工具类 */
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }