/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90e2;
    --secondary-color: #7b68ee;
    --success-color: #52c41a;
    --danger-color: #ff4d4f;
    --warning-color: #faad14;
    --text-color: #333;
    --text-light: #666;
    --text-lighter: #999;
    --border-color: #e8e8e8;
    --bg-color: #f5f5f5;
    --white: #ffffff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

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

/* 导航栏 */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

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

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

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

/* 主要内容 */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* 页面头部 */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #357abd;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: var(--text-light);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: var(--text-color);
}

.btn-link {
    color: var(--primary-color);
    background: none;
    padding: 0.5rem 1rem;
}

.btn-link:hover {
    text-decoration: underline;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* 卡片 */
.card {
    background-color: var(--white);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

/* 徽章 */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.badge-hot {
    background-color: var(--danger-color);
    color: var(--white);
}

.badge-top {
    background-color: var(--warning-color);
    color: var(--white);
}

.badge-featured {
    background-color: var(--success-color);
    color: var(--white);
}

.badge-category {
    background-color: var(--bg-color);
    color: var(--text-color);
}

/* 标签 */
.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 4px;
    font-size: 0.85rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.tag-link {
    text-decoration: none;
    transition: background-color 0.3s;
}

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

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
}

.page-info {
    color: var(--text-light);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
}

/* 页脚 */
.footer {
    background-color: #2c3e50;
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.8;
}

/* 错误页面 */
.error-page {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.error-content {
    text-align: center;
}

.error-content h1 {
    font-size: 6rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.error-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.error-content p {
    color: var(--text-light);
    margin-bottom: 2rem;
}