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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
    line-height: 1.6;
}

:root {
    --bg: #f8f9fa;
    --text: #212529;
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #7209b7;
    --accent: #f72585;
    --card-bg: #ffffff;
    --card-shadow: 0 4px 12px rgba(0,0,0,0.08);
    --header-bg: #ffffff;
    --footer-bg: #212529;
    --footer-text: #f8f9fa;
    --border: #dee2e6;
    --input-bg: #ffffff;
    --badge-bg: #e9ecef;
    --badge-text: #495057;
    --success: #2d6a4f;
    --error: #d00000;
    --radius: 12px;
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    --bg: #121212;
    --text: #e0e0e0;
    --primary: #bb86fc;
    --primary-dark: #9c64d8;
    --secondary: #03dac6;
    --accent: #cf6679;
    --card-bg: #1e1e1e;
    --card-shadow: 0 4px 12px rgba(0,0,0,0.4);
    --header-bg: #1e1e1e;
    --footer-bg: #0d0d0d;
    --footer-text: #e0e0e0;
    --border: #333;
    --input-bg: #2c2c2c;
    --badge-bg: #333;
    --badge-text: #e0e0e0;
}

/* 主题模板 */
[data-style="tech"] { --primary: #4361ee; --secondary: #7209b7; }
[data-style="fashion"] { --primary: #f72585; --secondary: #b5179e; }
[data-style="food"] { --primary: #e63946; --secondary: #f4a261; }

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

/* Header */
.header {
    background: var(--header-bg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background 0.3s;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    font-size: 1.8rem;
}

.nav {
    display: flex;
    gap: 25px;
}

.nav a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

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

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
}

.header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.theme-toggle, .dark-toggle, .hamburger {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text);
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition);
}

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

.hamburger {
    display: none;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 30px;
}

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

.btn {
    padding: 12px 28px;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    display: inline-block;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: var(--primary);
}

/* Section */
.section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: var(--text);
}

/* Search & Filters */
.search-bar {
    display: flex;
    gap: 10px;
    max-width: 600px;
    margin: 0 auto 30px;
}

.search-bar input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid var(--border);
    border-radius: 30px;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text);
    transition: border-color var(--transition);
}

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

.search-bar button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 30px;
    cursor: pointer;
    transition: background var(--transition);
}

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

.filters {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-group label {
    font-weight: 500;
}

.filter-group select {
    padding: 8px 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text);
    font-size: 0.9rem;
}

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

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

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

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

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

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

.badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--accent);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.product-info {
    padding: 20px;
}

.product-info h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text);
}

.product-desc {
    color: var(--text);
    opacity: 0.7;
    font-size: 0.9rem;
    margin-bottom: 12px;
    line-height: 1.4;
}

.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.price {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent);
}

.rating {
    font-size: 0.9rem;
    color: #ffc107;
}

.btn-add-cart {
    width: 100%;
    background: var(--primary);
    color: #fff;
    padding: 10px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition);
}

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

.no-results {
    text-align: center;
    padding: 40px;
    font-size: 1.2rem;
    color: var(--text);
    opacity: 0.7;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--card-shadow);
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

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

.heatmap-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--card-shadow);
    text-align: center;
}

#heatmapCanvas {
    width: 100%;
    max-width: 800px;
    height: 300px;
    background: var(--badge-bg);
    border-radius: 8px;
    margin: 0 auto;
}

.heatmap-label {
    margin-top: 10px;
    opacity: 0.7;
}

/* Footer */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 40px 0;
    text-align: center;
}

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

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

.footer-links a:hover {
    opacity: 0.8;
}

/* Admin */
.admin-body {
    background: var(--bg);
}

.admin-header {
    background: var(--header-bg);
    padding: 15px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

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

.admin-main {
    padding: 40px 0;
}

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

.admin-section h2 {
    margin-bottom: 20px;
    color: var(--primary);
}

.admin-form .form-group {
    margin-bottom: 20px;
}

.admin-form label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}

.admin-form textarea, .admin-form input {
    width: 100%;
    padding: 10px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    background: var(--input-bg);
    color: var(--text);
    font-family: monospace;
}

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

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

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

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

.ai-result {
    margin-top: 20px;
    background: var(--badge-bg);
    padding: 15px;
    border-radius: 8px;
    max-height: 400px;
    overflow-y: auto;
}

.ai-result pre {
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.85rem;
}

/* Admin Login */
.admin-login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.admin-login-container {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.admin-login-container h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text);
}

.admin-login-container .form-group {
    margin-bottom: 20px;
}

.admin-login-container label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.admin-login-container input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text);
}

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

.admin-login-container .btn {
    width: 100%;
    padding: 12px;
}

/* Page Hero */
.page-hero {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    padding: 60px 0;
    text-align: center;
}

.page-hero h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

/* Live Grid */
.live-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

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

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

.live-thumb {
    position: relative;
    height: 200px;
}

.live-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.live-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.live-badge.live {
    background: #e63946;
    color: #fff;
}

.live-badge.upcoming {
    background: #ffb703;
    color: #000;
}

.live-info {
    padding: 20px;
}

.live-info h3 {
    margin-bottom: 8px;
}

/* About */
.about-content {
    padding: 60px 0;
}

.about-text h2 {
    margin-top: 30px;
    color: var(--primary);
}

.about-text p {
    margin-bottom: 15px;
    line-height: 1.8;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--header-bg);
        padding: 20px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .nav.open {
        display: flex;
    }
    .hamburger {
        display: block;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .section-title {
        font-size: 1.5rem;
    }
    .filters {
        flex-direction: column;
        align-items: stretch;
    }
    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }
    .admin-login-container {
        margin: 20px;
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.4rem;
    }
    .product-grid {
        grid-template-columns: 1fr;
    }
}