/* 完全重构的三列布局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-card: #f8f9fa;
    --border-color: #e5e7eb;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --card-hover-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* 主容器 - 三列布局 */
.container {
    display: flex;
    min-height: 100vh;
}

/* 第一列：分类列 - 12.5% */
.column-categories {
    width: 12.5%;
    background-color: var(--bg-card);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    overflow-y: auto;
    padding: 20px 12px;
}

/* 第二列：文章列表列 - 12.5% */
.column-articles {
    width: 12.5%;
    background-color: var(--bg-card);
    border-right: 1px solid var(--border-color);
    position: fixed;
    left: 12.5%;
    top: 0;
    bottom: 0;
    overflow-y: auto;
    padding: 20px 12px;
    display: flex;
    flex-direction: column;
}

/* 第三列：文章内容列 - 75% */
.column-content {
    width: 75%;
    margin-left: 25%;
    background-color: var(--bg-primary);
    min-height: 100vh;
    overflow-y: auto;
    padding: 0;
}

/* Logo区域 */
.logo-area {
    padding: 16px 8px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 20px;
    text-align: center;
}

.logo-icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.logo-text {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

/* 列标题 */
.column-title {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    padding: 12px 8px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 16px;
    text-align: center;
}

/* 分类卡片 - 大卡片圆角深白色 */
.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 8px;
    margin-bottom: 12px;
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--card-shadow);
    text-decoration: none;
}

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

.category-card.active {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.category-card-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    margin-bottom: 12px;
    font-size: 28px;
    flex-shrink: 0;
}

.category-card-name {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
    text-align: center;
    word-wrap: break-word;
    line-height: 1.3;
}

.category-card-count {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 文章卡片 - 大卡片圆角深白色 */
.article-card {
    display: flex;
    flex-direction: column;
    padding: 20px 12px;
    margin-bottom: 12px;
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--card-shadow);
    text-decoration: none;
}

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

.article-card.active {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.article-card-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.article-card-desc {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.article-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: auto;
}

.article-card-date {
    display: flex;
    align-items: center;
}

.article-card-status {
    padding: 4px 8px;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: 10px;
    font-size: 10px;
    font-weight: 600;
}

/* 文章内容视图 */
.article-view {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px;
}

/* 文章头部 */
.article-header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.article-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 24px;
    font-size: 14px;
}

.article-back-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateX(-4px);
}

.article-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
    line-height: 1.2;
}

.article-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.article-edit-link {
    color: var(--primary-color);
    font-weight: 500;
}

.article-edit-link:hover {
    color: var(--primary-hover);
}

/* 文章正文 */
.article-body {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-primary);
    word-wrap: break-word;
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4,
.article-body h5,
.article-body h6 {
    margin-top: 40px;
    margin-bottom: 20px;
    font-weight: 700;
    line-height: 1.3;
}

.article-body h1 {
    font-size: 2.2em;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
}

.article-body h2 {
    font-size: 1.8em;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
    font-size: 1.4em;
}

.article-body h4 {
    font-size: 1.2em;
}

.article-body p {
    margin-bottom: 20px;
}

.article-body a {
    color: var(--primary-color);
    text-decoration: none;
}

.article-body a:hover {
    text-decoration: underline;
}

.article-body code {
    padding: 4px 8px;
    margin: 0;
    font-size: 85%;
    background-color: var(--bg-card);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    border: 1px solid var(--border-color);
}

.article-body pre {
    padding: 20px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.6;
    background-color: var(--bg-card);
    border-radius: 12px;
    border: 2px solid var(--border-color);
    margin-bottom: 24px;
}

.article-body pre code {
    padding: 0;
    margin: 0;
    background-color: transparent;
    border: 0;
}

.article-body blockquote {
    padding: 0 20px;
    color: var(--text-secondary);
    border-left: 4px solid var(--primary-color);
    margin: 0 0 20px;
    background-color: rgba(37, 99, 235, 0.05);
    border-radius: 8px;
    padding: 20px;
}

.article-body ul,
.article-body ol {
    padding-left: 2em;
    margin-bottom: 20px;
}

.article-body li {
    margin-bottom: 8px;
}

.article-body table {
    border-collapse: collapse;
    border-spacing: 0;
    width: 100%;
    margin-bottom: 20px;
}

.article-body table th,
.article-body table td {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
}

.article-body table th {
    background-color: var(--bg-card);
    font-weight: 700;
}

.article-body table tr:nth-child(2n) {
    background-color: var(--bg-card);
}

.article-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 30px auto;
    border-radius: 12px;
}

.article-body hr {
    height: 3px;
    padding: 0;
    margin: 40px 0;
    background-color: var(--border-color);
    border: 0;
    border-radius: 2px;
}

/* 空状态 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 40px 16px;
    text-align: center;
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-text {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.action-btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    text-decoration: none;
    margin-top: 16px;
}

.action-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* 欢迎页面 */
.welcome-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 40px);
    padding: 40px;
    text-align: center;
}

.welcome-icon {
    font-size: 80px;
    margin-bottom: 24px;
}

.welcome-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.welcome-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.welcome-hint {
    font-size: 16px;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .column-categories,
    .column-articles {
        width: 15%;
    }
    .column-articles {
        left: 15%;
    }
    .column-content {
        margin-left: 30%;
        width: 70%;
    }
}

@media (max-width: 992px) {
    .container {
        flex-direction: column;
    }
    
    .column-categories,
    .column-articles,
    .column-content {
        width: 100%;
        position: relative;
        left: 0;
        top: 0;
        bottom: auto;
        margin-left: 0;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        min-height: 400px;
    }
    
    .column-content {
        padding: 20px;
    }
    
    .article-view {
        padding: 30px 20px;
    }
    
    .article-title {
        font-size: 32px;
    }
}

@media (max-width: 768px) {
    .article-view {
        padding: 20px 16px;
    }
    
    .article-title {
        font-size: 28px;
    }
    
    .article-desc {
        font-size: 16px;
    }
    
    .article-body {
        font-size: 16px;
    }
}