/* 全局变量 */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1f2937;
    --gray: #6b7280;
    --light: #f9fafb;
    --white: #ffffff;
    --border: #e5e7eb;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light);
}

/* 布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
}

.main-content {
    min-width: 0;
}

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.navbar-nav a {
    text-decoration: none;
    color: var(--gray);
    padding: 8px 16px;
    border-radius: var(--radius);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.navbar-nav a:hover {
    background: var(--light);
    color: var(--primary);
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    font-weight: 500;
}

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--gray);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm { padding: 4px 12px; font-size: 0.75rem; }
.btn-lg { padding: 12px 24px; font-size: 1rem; }
.btn-block { display: flex; width: 100%; justify-content: center; }

/* 搜索区域 */
.search-section {
    margin-bottom: 24px;
}

.search-input-group {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.search-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}
.search-input:focus {
    outline: none;
    border-color: var(--primary);
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-tag {
    padding: 6px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    text-decoration: none;
    color: var(--gray);
    font-size: 0.875rem;
    transition: all 0.2s;
}
.filter-tag:hover,
.filter-tag.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* 文章卡片 */
.post-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    overflow: hidden;
    transition: box-shadow 0.2s;
}
.post-card:hover {
    box-shadow: var(--shadow-md);
}

.post-image-wrapper {
    height: 200px;
    overflow: hidden;
}

.post-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.post-body {
    padding: 20px;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.category-badge {
    background: #eff6ff;
    color: var(--primary);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.post-title {
    font-size: 1.25rem;
    margin-bottom: 8px;
}
.post-title a {
    color: var(--dark);
    text-decoration: none;
}
.post-title a:hover {
    color: var(--primary);
}

.post-excerpt {
    color: var(--gray);
    margin-bottom: 16px;
    font-size: 0.9375rem;
}

.post-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.post-stats {
    display: flex;
    gap: 16px;
    color: var(--gray);
    font-size: 0.875rem;
}

.stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

.read-more {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 侧边栏 */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-card {
    background: var(--white);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.sidebar-card h3 {
    font-size: 1rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-list {
    list-style: none;
}

.sidebar-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}
.sidebar-list li:last-child {
    border-bottom: none;
}

.sidebar-list a {
    color: var(--dark);
    text-decoration: none;
    font-size: 0.875rem;
}
.sidebar-list a:hover {
    color: var(--primary);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 32px;
}

.page-link {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--dark);
    transition: all 0.2s;
}
.page-link:hover,
.page-link.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* 表单页 */
.form-page {
    max-width: 600px;
    margin: 40px auto;
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.form-page h1 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.required {
    color: var(--danger);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    transition: border-color 0.2s;
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* 验证码 */
.captcha-group {
    display: flex;
    gap: 12px;
    align-items: center;
}

.captcha-input {
    flex: 1;
}

.captcha-img {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    height: 42px;
}

/* 文章详情 */
.article-detail {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.article-header {
    padding: 32px;
    border-bottom: 1px solid var(--border);
}

.article-title {
    font-size: 2rem;
    margin: 16px 0;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    color: var(--gray);
    font-size: 0.875rem;
}

.article-meta > div {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-featured-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
}

.article-content {
    padding: 32px;
    font-size: 1.0625rem;
    line-height: 1.8;
}

.article-footer {
    padding: 20px 32px;
    border-top: 1px solid var(--border);
}

.share-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.share-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.share-btn:hover {
    background: var(--light);
}

/* 评论区 */
.comments-section {
    padding: 32px;
    border-top: 1px solid var(--border);
}

.comments-section h2 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
}

.comment-form textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    resize: vertical;
    font-family: inherit;
    margin-bottom: 12px;
}

.comment-as {
    margin-bottom: 8px;
    padding: 8px 12px;
    background: #f0fdf4;
    border-radius: var(--radius);
    font-size: 0.875rem;
}

.login-to-comment {
    text-align: center;
    padding: 32px;
    background: var(--light);
    border-radius: var(--radius);
}

.comment {
    display: flex;
    gap: 12px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.comment-avatar {
    width: 40px;
    height: 40px;
    background: var(--light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.comment-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.admin-badge {
    background: var(--primary);
    color: white;
    padding: 1px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
}

.comment-time {
    color: var(--gray);
    font-size: 0.75rem;
}

.reply-btn {
    margin-top: 8px;
    background: none;
    border: none;
    color: var(--gray);
    cursor: pointer;
    font-size: 0.8125rem;
    display: flex;
    align-items: center;
    gap: 4px;
}
.reply-btn:hover {
    color: var(--primary);
}

/* 成功消息 */
.success-message {
    text-align: center;
    padding: 48px 24px;
}
.success-message i {
    color: var(--success);
    width: 64px;
    height: 64px;
}
.success-message h2 {
    margin: 16px 0 8px;
    color: var(--success);
}

/* 警告 */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* 图标大小 */
.icon-sm { width: 16px; height: 16px; }
.icon-xs { width: 12px; height: 12px; }

/* 页脚 */
.footer {
    text-align: center;
    padding: 32px;
    color: var(--gray);
    border-top: 1px solid var(--border);
    margin-top: 48px;
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .article-title {
        font-size: 1.5rem;
    }
    
    .form-page {
        padding: 24px;
    }
    
    .post-footer {
        flex-direction: column;
        gap: 12px;
    }
}