* {
    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: #333;
    --card-bg: #fff;
    --shadow: 0 4px 15px rgba(0,0,0,0.1);
    --primary: #007bff;
    --accent: #ff6b6b;
}

[data-theme="dark"] {
    --bg: #1a1a2e;
    --text: #e0e0e0;
    --card-bg: #16213e;
    --shadow: 0 4px 15px rgba(0,0,0,0.5);
    --primary: #4da6ff;
    --accent: #ff8c8c;
}

/* 主题模板 */
.tech-theme { --primary: #007bff; --accent: #ff6b6b; }
.fashion-theme { --primary: #e83e8c; --accent: #ffc107; }
.food-theme { --primary: #28a745; --accent: #dc3545; }

.header {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-switcher select {
    padding: 0.3rem;
    border-radius: 5px;
    border: 1px solid #ddd;
    background: var(--card-bg);
    color: var(--text);
}

.dark-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text);
    margin: 3px 0;
    transition: 0.3s;
}

.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.search-filter {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.filter-form {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-form input, .filter-form select {
    padding: 0.5rem;
    border-radius: 5px;
    border: 1px solid #ddd;
    background: var(--card-bg);
    color: var(--text);
}

.filter-form button {
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.filter-form button:hover {
    background: var(--accent);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.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 25px rgba(0,0,0,0.2);
}

.card-image {
    height: 200px;
    background-size: cover;
    background-position: center;
}

.card-body {
    padding: 1.5rem;
}

.card-category {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.card-body h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.card-tags {
    margin: 0.5rem 0;
}

.tag {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 0.2rem 0.5rem;
    border-radius: 10px;
    font-size: 0.7rem;
    margin: 0.2rem;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: #888;
}

.card-meta i {
    cursor: pointer;
}

.heatmap {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.heatmap-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.heatmap-item {
    padding: 0.5rem 1rem;
    border-radius: 5px;
    color: #fff;
    font-size: 0.8rem;
    cursor: pointer;
    transition: transform 0.2s;
}

.heatmap-item:hover {
    transform: scale(1.1);
}

.footer {
    background: var(--card-bg);
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

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

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

.no-results {
    text-align: center;
    padding: 2rem;
    color: #888;
}

.admin-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.login-form, .admin-panel {
    text-align: center;
}

.login-form input, .admin-form input, .admin-form textarea {
    width: 100%;
    padding: 0.5rem;
    margin: 0.5rem 0;
    border-radius: 5px;
    border: 1px solid #ddd;
    background: var(--bg);
    color: var(--text);
}

.login-form button, .admin-form button {
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin: 0.5rem 0;
}

.error { color: #dc3545; }
.success { color: #28a745; }

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

.article-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    border-bottom: 1px solid #ddd;
}

.article-item button {
    background: #dc3545;
    color: #fff;
    border: none;
    padding: 0.3rem 0.5rem;
    border-radius: 5px;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        background: var(--card-bg);
        padding: 1rem;
    }
    .nav-menu.active {
        display: flex;
    }
    .hamburger {
        display: flex;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .blog-grid {
        grid-template-columns: 1fr;
    }
    .filter-form {
        flex-direction: column;
    }
}