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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-color, #f8f9fa);
    color: var(--text-color, #333);
    transition: background 0.3s, color 0.3s;
}

:root {
    --bg-color: #f8f9fa;
    --text-color: #333;
    --card-bg: #fff;
    --shadow: 0 4px 12px rgba(0,0,0,0.1);
    --primary: #e91e63;
    --primary-hover: #c2185b;
    --navbar-bg: #fff;
    --footer-bg: #333;
    --footer-text: #fff;
}

[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --text-color: #e0e0e0;
    --card-bg: #16213e;
    --shadow: 0 4px 12px rgba(0,0,0,0.5);
    --primary: #ff6b6b;
    --primary-hover: #ee5a24;
    --navbar-bg: #0f3460;
    --footer-bg: #0f3460;
    --footer-text: #e0e0e0;
}

/* 模板样式 */
[data-template="tech"] {
    --primary: #00bcd4;
    --primary-hover: #0097a7;
}

[data-template="fashion"] {
    --primary: #9c27b0;
    --primary-hover: #7b1fa2;
}

[data-template="food"] {
    --primary: #ff5722;
    --primary-hover: #e64a19;
}

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

/* 导航栏 */
.navbar {
    background: var(--navbar-bg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
}

.logo i {
    margin-right: 8px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary);
}

.theme-toggle button {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: 10px;
    color: var(--text-color);
}

.hamburger {
    display: none;
}

/* 搜索与筛选 */
.search-filter {
    text-align: center;
    padding: 40px 0;
    background: linear-gradient(135deg, var(--primary), #ff9a9e);
    color: #fff;
}

.search-filter h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.search-bar {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 20px 0;
}

.search-bar input {
    width: 50%;
    padding: 12px;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
}

.search-bar button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: background 0.3s;
}

.search-bar button:hover {
    background: var(--primary-hover);
}

.filters {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.filters select {
    padding: 10px;
    border: none;
    border-radius: 20px;
    font-size: 1rem;
    background: #fff;
    color: #333;
}

/* 产品网格 */
.product-grid {
    padding: 40px 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.card {
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 20px;
}

.card-content h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.price {
    color: var(--primary);
    font-weight: bold;
    font-size: 1.1rem;
}

.rating {
    color: #ffc107;
    margin: 10px 0;
}

.add-to-cart {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: background 0.3s;
    width: 100%;
}

.add-to-cart:hover {
    background: var(--primary-hover);
}

/* 页脚 */
footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 20px 0;
}

footer a {
    color: var(--footer-text);
    margin: 0 10px;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: var(--navbar-bg);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }
    .nav-links.active {
        display: flex;
    }
    .hamburger {
        display: block;
    }
    .search-bar input {
        width: 70%;
    }
}

/* 管理后台样式 */
.admin-login, .admin-panel {
    padding: 40px 0;
}

.admin-login form, .admin-panel form {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.admin-login input, .admin-panel input, .admin-panel textarea, .admin-panel select {
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 1rem;
}

.admin-panel button, .admin-login button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}

.admin-panel button:hover, .admin-login button:hover {
    background: var(--primary-hover);
}

.admin-section {
    margin: 30px 0;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table th, table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.error {
    color: red;
    margin: 10px 0;
}

.success {
    color: green;
    margin: 10px 0;
}

.logout-btn {
    float: right;
    background: #dc3545;
    color: #fff;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 8px;
}