:root {
    --primary-color: #2e7d32;
    --primary-light: #4caf50;
    --primary-dark: #1b5e20;
    --secondary-color: #ff8f00;
    --bg-color: #ffffff;
    --bg-secondary: #f5f5f5;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #e0e0e0;
    --card-bg: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --radius: 16px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --bg-secondary: #1e1e1e;
    --text-color: #e0e0e0;
    --text-light: #aaaaaa;
    --border-color: #333333;
    --card-bg: #1e1e1e;
    --shadow: 0 4px 20px rgba(0,0,0,0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

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

/* 导航栏 */
.navbar {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle,
.hamburger {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: var(--transition);
}

.theme-toggle:hover,
.hamburger:hover {
    background: var(--bg-secondary);
}

.hamburger {
    display: none;
}

/* 搜索与筛选 */
.search-filter {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 60px 0;
    text-align: center;
}

.search-filter h1 {
    font-size: 2rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.search-bar {
    max-width: 600px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    background: white;
    border-radius: 50px;
    padding: 12px 24px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.search-bar i {
    color: var(--primary-color);
    margin-right: 12px;
}

.search-bar input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    background: transparent;
    color: #333;
}

.filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.filters select {
    padding: 10px 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 25px;
    background: rgba(255,255,255,0.15);
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.filters select option {
    color: #333;
    background: white;
}

.filters select:hover {
    background: rgba(255,255,255,0.25);
}

/* 内容网格 */
.content-grid {
    padding: 40px 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

.card-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.card-category {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.card-content {
    padding: 20px;
}

.card-content h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-color);
}

.card-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.rating .fa-star {
    color: #ddd;
    font-size: 0.8rem;
}

.rating .fa-star.active {
    color: var(--secondary-color);
}

.price {
    font-weight: 700;
    color: var(--primary-color);
}

.card-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.tag {
    background: var(--bg-secondary);
    color: var(--text-light);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
}

/* 热力图 */
.heatmap-section {
    padding: 40px 0;
    background: var(--bg-secondary);
}

.heatmap-section h2 {
    text-align: center;
    margin-bottom: 24px;
    color: var(--text-color);
}

.heatmap {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.heatmap-item {
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.8rem;
    opacity: calc(0.3 + var(--heat) * 0.7);
    transition: var(--transition);
}

.heatmap-item:hover {
    transform: scale(1.05);
}

/* 页脚 */
.footer {
    background: var(--primary-dark);
    color: white;
    padding: 40px 0 20px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--secondary-color);
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}

.footer-social a {
    color: white;
    font-size: 1.5rem;
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--secondary-color);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* 管理后台 */
.admin-body {
    background: var(--bg-secondary);
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.alert-error {
    background: #fde8e8;
    color: #c53030;
    border: 1px solid #feb2b2;
}

.alert-success {
    background: #e8fde8;
    color: #2c7a2c;
    border: 1px solid #b2feb2;
}

.login-footer {
    text-align: center;
    margin-top: 16px;
}

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

.admin-dashboard {
    display: flex;
    min-height: 100vh;
}

.admin-nav {
    width: 250px;
    background: var(--primary-dark);
    color: white;
    padding: 20px;
}

.admin-nav-header {
    margin-bottom: 24px;
}

.admin-nav-header h2 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.admin-nav-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.admin-nav-links a {
    color: white;
    text-decoration: none;
    padding: 12px;
    border-radius: 8px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.admin-nav-links a:hover,
.admin-nav-links a.active {
    background: rgba(255,255,255,0.1);
}

.admin-main {
    flex: 1;
    padding: 24px;
    background: var(--bg-secondary);
}

.admin-section {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.admin-section h2 {
    color: var(--text-color);
    margin-bottom: 16px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--radius);
    text-align: center;
}

.stat-card h3 {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--card-bg);
        box-shadow: var(--shadow);
        padding: 20px;
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

    .search-filter h1 {
        font-size: 1.5rem;
    }

    .filters {
        flex-direction: column;
        align-items: center;
    }

    .filters select {
        width: 100%;
        max-width: 300px;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .admin-dashboard {
        flex-direction: column;
    }

    .admin-nav {
        width: 100%;
    }

    .admin-nav-links {
        flex-direction: row;
        flex-wrap: wrap;
    }
}