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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #f5f7fa;
    color: #333;
}

/* 登录页面 */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 24px;
    color: #333;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.btn-primary {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-secondary {
    padding: 10px 20px;
    background: #f0f0f0;
    color: #666;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.hint {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: #999;
}

/* 管理后台 */
.admin-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background: #2c3e50;
    color: white;
    padding: 20px;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    padding: 20px 0;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo span:first-child {
    font-size: 32px;
}

.nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item {
    padding: 12px 16px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
}

.nav-item:hover,
.nav-item.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.main-content {
    margin-left: 250px;
    flex: 1;
    padding: 30px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

.page-header h1 {
    font-size: 28px;
    color: #333;
}

.filters {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.filters select {
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    background: white;
}

/* 文章列表 */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.article-item {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: box-shadow 0.3s;
}

.article-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.article-info {
    flex: 1;
}

.article-info h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: #333;
}

.article-meta {
    font-size: 13px;
    color: #999;
    display: flex;
    gap: 15px;
}

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

.article-actions button {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-edit {
    background: #e3f2fd;
    color: #1976d2;
}

.btn-edit:hover {
    background: #1976d2;
    color: white;
}

.btn-delete {
    background: #ffebee;
    color: #c62828;
}

.btn-delete:hover {
    background: #c62828;
    color: white;
}

.btn-view {
    background: #e8f5e9;
    color: #2e7d32;
}

.btn-view:hover {
    background: #2e7d32;
    color: white;
}

/* 文章表单 */
.article-form {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.editor-toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.editor-toolbar button {
    padding: 6px 12px;
    background: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
}

.editor-toolbar button:hover {
    background: #e0e0e0;
}

.upload-box {
    border: 2px dashed #ddd;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    margin-top: 10px;
}

.image-preview {
    margin-top: 15px;
}

.image-preview img {
    max-width: 300px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
}

.form-actions .btn-primary {
    width: auto;
    min-width: 150px;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 30px;
}

.pagination button {
    padding: 8px 16px;
    border: 1px solid #ddd;
    background: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.pagination button:hover,
.pagination button.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

/* 设置卡片 */
.settings-card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}

.settings-card h3 {
    margin-bottom: 15px;
    color: #333;
}

.settings-card p {
    margin: 8px 0;
    color: #666;
    font-size: 14px;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 40px;
    color: #999;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .main-content {
        margin-left: 0;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .article-item {
        flex-direction: column;
        gap: 15px;
    }

    .article-actions {
        width: 100%;
        justify-content: flex-end;
    }
}

/* 文章网格布局 */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.article-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 13px;
}

.category-tag {
    background: #f0f0f0;
    padding: 4px 10px;
    border-radius: 20px;
    color: #666;
}

.views {
    color: #999;
}

.article-card h3 {
    font-size: 16px;
    margin-bottom: 10px;
    color: #333;
    line-height: 1.4;
}

.article-card .excerpt {
    font-size: 13px;
    color: #666;
    margin-bottom: 16px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

.btn-edit, .btn-delete {
    flex: 1;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-edit {
    background: #667eea;
    color: white;
}

.btn-edit:hover {
    background: #5568d3;
}

.btn-delete {
    background: #fee;
    color: #e74c3c;
}

.btn-delete:hover {
    background: #fdd;
}

/* 空状态 */
.empty-state, .error-state, .loading {
    text-align: center;
    padding: 60px 20px;
    color: #999;
    font-size: 14px;
}

.error-state {
    color: #e74c3c;
}

/* 分页 */
.pagination {
    margin-top: 20px;
    padding: 20px;
    text-align: center;
}

.pagination-info {
    color: #666;
    font-size: 14px;
}

/* 图片预览 */
.image-preview {
    margin-top: 10px;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 8px;
    min-height: 50px;
}

.image-preview img {
    max-width: 100%;
    border-radius: 8px;
}

/* 编辑器工具栏 */
.editor-toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.editor-toolbar button {
    padding: 6px 12px;
    background: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
}

.editor-toolbar button:hover {
    background: #e0e0e0;
}

/* 设置卡片 */
.settings-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.settings-card h3 {
    margin-bottom: 16px;
    color: #333;
}

.settings-card p {
    color: #666;
    margin-bottom: 8px;
    font-size: 14px;
}