* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

:root {
    --bg: #ffffff;
    --text: #1a1a2e;
    --primary: #6c63ff;
    --primary-dark: #4a42d4;
    --card-bg: #f8f9ff;
    --border: #e0e0e0;
    --shadow: 0 8px 30px rgba(0,0,0,0.08);
    --radius: 16px;
    --nav-bg: rgba(255,255,255,0.9);
    --footer-bg: #1a1a2e;
    --footer-text: #ccc;
}

[data-theme="dark"] {
    --bg: #121212;
    --text: #e0e0e0;
    --primary: #8b83ff;
    --primary-dark: #6c63ff;
    --card-bg: #1f1f2e;
    --border: #333;
    --shadow: 0 8px 30px rgba(0,0,0,0.5);
    --nav-bg: rgba(18,18,18,0.95);
    --footer-bg: #0a0a0a;
    --footer-text: #aaa;
}

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

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

/* 导航 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 10px 0;
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}
.logo i { margin-right: 8px; }
.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text);
    cursor: pointer;
}
.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 20px;
}
.nav-menu a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 8px;
}
.nav-menu a:hover, .nav-menu a.active {
    background: var(--primary);
    color: #fff;
}
.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}
.theme-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text);
}
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-outline-light {
    background: transparent;
    border: 2px solid #fff;
    color: #fff;
}
.btn-outline-light:hover { background: #fff; color: var(--primary); }
.btn-sm { padding: 6px 16px; font-size: 0.85rem; }

/* 英雄区 */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #6c63ff 0%, #a78bfa 100%);
    color: #fff;
    text-align: center;
}
.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
}
.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 30px;
    opacity: 0.9;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; }

/* 搜索筛选 */
.filter-section {
    padding: 40px 0;
    background: var(--card-bg);
}
.search-bar {
    display: flex;
    max-width: 500px;
    margin: 0 auto 20px;
}
.search-bar input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid var(--border);
    border-radius: 30px 0 0 30px;
    outline: none;
    background: var(--bg);
    color: var(--text);
}
.search-bar button {
    padding: 12px 24px;
    border: none;
    background: var(--primary);
    color: #fff;
    border-radius: 0 30px 30px 0;
    cursor: pointer;
}
.filters {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.filters select {
    padding: 10px 20px;
    border: 2px solid var(--border);
    border-radius: 30px;
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
}

/* 作品网格 */
.works-grid-section {
    padding: 60px 0;
}
.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: var(--text);
}
.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}
.work-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}
.work-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}
.work-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}
.work-info {
    padding: 20px;
}
.work-info h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}
.work-info p {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 12px;
}
.price {
    display: inline-block;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}
.rating i {
    color: #f5a623;
    font-size: 0.9rem;
}

/* 统计 */
.stats-section {
    padding: 60px 0;
    background: var(--card-bg);
}
.stats-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-bottom: 30px;
}
.stat-card {
    background: var(--bg);
    padding: 20px 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    font-weight: 600;
}
.stat-card i {
    margin-right: 8px;
    color: var(--primary);
}
.heatmap {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    max-width: 600px;
    margin: 0 auto;
}
.heat-block {
    width: 20px;
    height: 20px;
    background: var(--primary);
    border-radius: 4px;
}

/* 页脚 */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 40px 0;
    text-align: center;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}
.footer-links a {
    color: var(--footer-text);
    text-decoration: none;
}
.footer-links a:hover { color: #fff; }
.social-share {
    margin-bottom: 20px;
}
.social-share a {
    color: var(--footer-text);
    font-size: 1.5rem;
    margin: 0 10px;
}
.social-share a:hover { color: var(--primary); }
.copyright { font-size: 0.9rem; }

/* 登录 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg);
}
.login-form {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
}
.login-form h2 { margin-bottom: 20px; }
.login-form input {
    width: 100%;
    padding: 12px;
    margin-bottom: 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
}
.error { color: #e74c3c; margin-bottom: 10px; }
.success { color: #2ecc71; margin-top: 10px; }

/* 管理员后台 */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--primary);
    color: #fff;
}
.admin-main {
    padding: 40px 20px;
    max-width: 800px;
    margin: 0 auto;
}
.admin-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}
.admin-card h2 { margin-bottom: 20px; }
.admin-card input, .admin-card textarea, .admin-card select {
    width: 100%;
    padding: 12px;
    margin-bottom: 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
}
.ai-result {
    margin-top: 20px;
    padding: 15px;
    background: var(--bg);
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

/* 响应式 */
@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: var(--nav-bg);
        padding: 20px;
        box-shadow: var(--shadow);
    }
    .nav-menu.active { display: block; }
    .nav-menu ul { flex-direction: column; gap: 10px; }
    .nav-actions { display: none; }
    .hero h1 { font-size: 2rem; }
    .filters { flex-direction: column; align-items: center; }
    .works-grid { grid-template-columns: 1fr; }
}

/* 内页通用 */
.page-hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, #6c63ff, #a78bfa);
    color: #fff;
    text-align: center;
}
.page-hero h1 { font-size: 2.5rem; }
.page-content {
    padding: 60px 0;
}
.page-content p {
    max-width: 800px;
    margin: 0 auto 20px;
    font-size: 1.1rem;
    color: #555;
}
[data-theme="dark"] .page-content p { color: #ccc; }