/* 全局样式与主题变量 */
:root {
    --bg-color: #ffffff;
    --text-color: #1a1a2e;
    --primary-color: #ff6b6b;
    --secondary-color: #f5f5f5;
    --card-bg: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --radius: 16px;
    --nav-bg: rgba(255,255,255,0.8);
    --border-color: #e0e0e0;
    --hover-bg: #f0f0f0;
}

[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --text-color: #e0e0e0;
    --primary-color: #ff6b6b;
    --secondary-color: #16213e;
    --card-bg: #0f3460;
    --shadow: 0 4px 20px rgba(0,0,0,0.4);
    --nav-bg: rgba(26,26,46,0.9);
    --border-color: #2a2a4a;
    --hover-bg: #2a2a4a;
}

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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    transition: background-color 0.3s, color 0.3s;
}

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

/* 导航 */
.navbar {
    position: sticky;
    top: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: 15px 0;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #f39c12);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 25px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: none;
    border: none;
    gap: 5px;
    padding: 5px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--text-color);
    border-radius: 3px;
    transition: 0.3s;
}

.theme-btn {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 30px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: 0.3s;
}

.theme-btn:hover {
    border-color: var(--primary-color);
}

/* Hero */
.hero {
    padding: 80px 0 60px;
    text-align: center;
    background: linear-gradient(135deg, var(--secondary-color), var(--bg-color));
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    font-weight: 800;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.8;
}

.search-box {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    gap: 0;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.search-box input {
    flex: 1;
    padding: 16px 20px;
    border: none;
    outline: none;
    font-size: 1rem;
    background: var(--card-bg);
    color: var(--text-color);
}

.search-box button {
    padding: 16px 32px;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: 0.3s;
}

.search-box button:hover {
    opacity: 0.9;
}

.hot-keywords {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}

.keyword {
    padding: 6px 14px;
    background: var(--secondary-color);
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    color: var(--text-color);
    transition: 0.3s;
}

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

/* 筛选 */
.filters-section {
    padding: 40px 0;
    background: var(--secondary-color);
}

.filters-section h2 {
    margin-bottom: 20px;
}

.filter-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.filter-group select {
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    border-radius: 30px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    transition: 0.3s;
}

.filter-group select:hover {
    border-color: var(--primary-color);
}

/* 卡片网格 */
.gallery-section {
    padding: 60px 0;
}

.gallery-section h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

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

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.card-body {
    padding: 20px;
}

.card-body h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.card-body p {
    opacity: 0.7;
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-weight: 600;
}

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

.rating {
    color: #f39c12;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 15px;
}

.tag {
    padding: 4px 12px;
    background: var(--secondary-color);
    border-radius: 20px;
    font-size: 0.8rem;
}

.card-actions {
    display: flex;
    gap: 10px;
}

.share-btn, .like-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 30px;
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    transition: 0.3s;
    font-size: 0.9rem;
}

.share-btn:hover, .like-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 统计 */
.stats-section {
    padding: 60px 0;
    background: var(--secondary-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

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

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    margin-top: 8px;
    font-size: 1rem;
    opacity: 0.7;
}

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

.heatmap-placeholder {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--secondary-color);
    border-radius: var(--radius);
    color: var(--text-color);
    opacity: 0.6;
}

/* 页脚 */
.footer {
    padding: 30px 0;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-links {
    margin-bottom: 15px;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s;
}

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

/* 后台 */
.admin-container {
    min-height: 80vh;
    padding: 40px 0;
}

.login-form {
    max-width: 400px;
    margin: 0 auto;
    padding: 40px;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.login-form h2 {
    text-align: center;
    margin-bottom: 30px;
}

.login-form input {
    width: 100%;
    padding: 12px 16px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: 30px;
    background: var(--bg-color);
    color: var(--text-color);
}

.login-form button {
    width: 100%;
    padding: 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

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

.admin-section h3 {
    margin-bottom: 20px;
}

.admin-section label {
    display: block;
    margin-bottom: 15px;
}

.admin-section input,
.admin-section textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    margin-top: 5px;
}

.admin-section textarea {
    min-height: 80px;
}

.admin-section button {
    padding: 12px 30px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    cursor: pointer;
    transition: 0.3s;
}

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

.error {
    color: #e74c3c;
    margin-bottom: 15px;
}

.success {
    color: #2ecc71;
    margin-bottom: 15px;
}

.ai-result {
    background: var(--secondary-color);
    padding: 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
}

/* 响应式 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--nav-bg);
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
    }

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

    .hero h1 {
        font-size: 2rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .filter-group {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

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