/* 全局样式 - 白色+灰色主题，简洁大方 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #95a5a6;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-gray: #e9ecef;
    --text-color: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --border-color: #dee2e6;
    --hover-color: #34495e;
    --success-color: #27ae60;
    --error-color: #e74c3c;
    --link-color: #3498db;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-light);
    font-size: 16px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
.header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

.logo a {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

.logo a:hover {
    color: var(--hover-color);
}

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

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 0;
}

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

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

/* Flash 消息 */
.flash-messages {
    margin-bottom: 1.5rem;
}

.flash-message {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.flash-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.flash-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Hero 区域 */
.hero-section {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 3rem;
}

.blog-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.blog-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    font-weight: 300;
}

/* 文章列表 */
.posts-container {
    margin-top: 2rem;
}

.posts-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.post-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.post-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.post-header {
    margin-bottom: 1rem;
}

.post-title {
    font-size: 1.8rem;
    margin-bottom: 0.75rem;
}

.post-title a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

.post-title a:hover {
    color: var(--hover-color);
}

.post-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.post-excerpt {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.post-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.read-more {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.read-more:hover {
    color: var(--hover-color);
}

.post-actions {
    display: flex;
    gap: 0.75rem;
}

/* 按钮样式 */
.btn-primary,
.btn-edit,
.btn-delete,
.btn-back,
.btn-cancel {
    padding: 0.5rem 1.25rem;
    border: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

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

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

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

.btn-edit:hover {
    background-color: #7f8c8d;
}

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

.btn-delete:hover {
    background-color: #c0392b;
}

.btn-back {
    background-color: var(--bg-gray);
    color: var(--text-color);
}

.btn-back:hover {
    background-color: var(--border-color);
}

.btn-cancel {
    background-color: var(--bg-gray);
    color: var(--text-color);
}

.btn-cancel:hover {
    background-color: var(--border-color);
}

/* 文章详情页 */
.post-detail {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 3rem;
    box-shadow: var(--shadow);
}

.post-detail-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.post-detail-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.post-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.meta-item {
    display: flex;
    align-items: center;
}

.post-detail-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 2rem;
    white-space: pre-wrap;
}

.post-detail-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
}

/* 表单样式 */
.form-container {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
}

.form-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.post-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.95rem;
}

.form-control {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1rem;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 3rem;
    padding: 1.5rem;
}

.page-link {
    padding: 0.5rem 1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    text-decoration: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: all 0.3s;
}

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

.page-info {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-light);
}

.empty-state a {
    color: var(--link-color);
    text-decoration: none;
}

.empty-state a:hover {
    text-decoration: underline;
}

/* 关于页面 */
.about-container {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 3rem;
    box-shadow: var(--shadow);
    max-width: 700px;
    margin: 0 auto;
}

.page-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.about-content {
    line-height: 1.8;
    color: var(--text-color);
}

.about-content h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.about-content p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

/* 页脚 */
.footer {
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .blog-title {
        font-size: 2rem;
    }
    
    .post-card,
    .post-detail,
    .form-container {
        padding: 1.5rem;
    }
    
    .post-detail-title {
        font-size: 1.8rem;
    }
    
    .post-footer,
    .post-detail-actions {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions button,
    .form-actions a {
        width: 100%;
        text-align: center;
    }
}