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

:root {
    --bg: #ffffff;
    --text: #2c3e50;
    --primary: #e74c3c;
    --secondary: #f39c12;
    --card-bg: #f8f9fa;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --radius: 16px;
    --transition: 0.3s ease;
    --font: 'Segoe UI', Roboto, system-ui, sans-serif;
}

[data-theme="dark"] {
    --bg: #1a1a2e;
    --text: #eaeaea;
    --card-bg: #16213e;
    --shadow: 0 4px 20px rgba(0,0,0,0.4);
    --primary: #e74c3c;
    --secondary: #f1c40f;
}

[data-template="tech"] {
    --primary: #3498db;
    --secondary: #2ecc71;
    --radius: 8px;
}

[data-template="fashion"] {
    --primary: #9b59b6;
    --secondary: #e84393;
    --radius: 24px;
}

[data-template="food"] {
    --primary: #e67e22;
    --secondary: #d35400;
    --radius: 20px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
}

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

/* 导航 */
.site-header {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem;
}

.nav-brand a {
    font-size: 1.6rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    padding: 0.5rem 1rem;
    border-radius: 30px;
    transition: background var(--transition), color var(--transition);
    font-weight: 500;
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text);
    cursor: pointer;
}

.theme-controls {
    display: flex;
    gap: 0.5rem;
}

.theme-controls button {
    background: var(--card-bg);
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text);
    transition: all var(--transition);
}

.theme-controls button:hover {
    background: var(--primary);
    color: #fff;
}

/* Hero */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, rgba(231,76,60,0.1), rgba(243,156,18,0.1));
    border-radius: 0 0 50px 50px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.search-bar {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

.search-bar input {
    flex: 1;
    min-width: 200px;
    padding: 0.8rem 1.2rem;
    border: 2px solid rgba(0,0,0,0.1);
    border-radius: 30px;
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
}

.search-bar button {
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 30px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition);
}

.search-bar button:hover { transform: scale(1.05); }

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

.filters select {
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    border: 1px solid rgba(0,0,0,0.1);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
}

/* 卡片网格 */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    padding: 3rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.item-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px 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: transform 0.5s;
}

.item-card:hover .card-image img { transform: scale(1.1); }

.card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.6));
    display: flex;
    justify-content: space-between;
    color: #fff;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-body h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.card-body p {
    opacity: 0.8;
    font-size: 0.95rem;
    margin-bottom: 0.8rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.tag {
    background: rgba(231,76,60,0.1);
    color: var(--primary);
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

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

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

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

.btn-primary:hover { opacity: 0.9; transform: scale(1.02); }

.btn-secondary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

/* 统计 */
.stats-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
}

.stats-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin: 1.5rem 0;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    min-width: 150px;
    box-shadow: var(--shadow);
}

.stat-card i {
    font-size: 2rem;
    color: var(--primary);
}

.stat-card span {
    display: block;
    font-size: 2rem;
    font-weight: 700;
}

/* 热力图 */
.heatmap-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-top: 1rem;
}

#heatmap {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    justify-content: center;
    padding: 1rem;
}

.heat-bar {
    height: 20px;
    border-radius: 10px;
    transition: width 0.5s;
    cursor: pointer;
}

/* 分享 */
.share-section {
    text-align: center;
    padding: 2rem;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.share-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--card-bg);
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.share-btn:hover {
    background: var(--primary);
    color: #fff;
    transform: scale(1.1);
}

/* 页脚 */
.site-footer {
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border-top: 1px solid rgba(0,0,0,0.05);
}

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

.footer-links a {
    color: var(--text);
    font-weight: 500;
}

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

/* 管理后台 */
.admin-main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.login-form {
    max-width: 400px;
    margin: 4rem auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.login-form input {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
}

.login-form button {
    width: 100%;
    padding: 0.8rem;
    border: none;
    border-radius: 30px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.admin-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.admin-card h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.admin-card input,
.admin-card textarea,
.admin-card select {
    width: 100%;
    padding: 0.6rem;
    margin-bottom: 0.8rem;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
}

.admin-card textarea {
    min-height: 80px;
    resize: vertical;
}

.admin-card button {
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 30px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: opacity var(--transition);
}

.admin-card button:hover { opacity: 0.9; }

.admin-items {
    margin-top: 1rem;
}

.admin-item {
    background: var(--card-bg);
    padding: 0.8rem 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.item-actions .btn-small {
    padding: 0.3rem 0.8rem;
    background: var(--primary);
    color: #fff;
    border-radius: 20px;
    font-size: 0.8rem;
}

.error { color: #e74c3c; font-weight: 600; }
.msg { color: #2ecc71; font-weight: 600; }

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--card-bg);
        box-shadow: var(--shadow);
        padding: 1rem;
    }

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

    .hamburger { display: block; }

    .hero h1 { font-size: 1.8rem; }

    .items-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

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

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