/**
 * Nebula Theme - Single Article Page Styles
 * Version: 2.0.0
 */

/* Reading Progress Bar */
.nebula-reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: transparent;
    z-index: 9999;
}

.nebula-reading-progress__bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--nebula-primary, #0EA5E9), #0284C7);
    transition: width 0.1s ease-out;
    box-shadow: 0 0 10px rgba(14, 165, 233, 0.5);
}

/* Article Header */
.nebula-article-header {
    position: relative;
    padding: 64px 0 48px;
    background: linear-gradient(180deg, var(--nebula-bg-secondary, #F8FAFC) 0%, var(--nebula-bg, #FFFFFF) 100%);
    border-bottom: 1px solid var(--nebula-border, #E2E8F0);
}

.nebula-article-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--nebula-primary, #0EA5E9), #0284C7, var(--nebula-primary, #0EA5E9));
}

.nebula-article-header__cats {
    margin-bottom: 20px;
}

.nebula-article-header__cat {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--nebula-primary, #0EA5E9), #0284C7);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--nebula-radius-full, 9999px);
    text-decoration: none;
    transition: all var(--nebula-duration-fast, 0.15s);
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.25);
}

.nebula-article-header__cat:hover {
    background: var(--nebula-primary-hover, #0284C7);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.35);
}

.nebula-article-header__title {
    font-size: var(--nebula-text-4xl, 2.5rem);
    font-weight: var(--nebula-font-bold, 700);
    color: var(--nebula-text, #1E293B);
    line-height: 1.25;
    margin-bottom: 28px;
    max-width: 900px;
    letter-spacing: -0.02em;
}

.nebula-article-header__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.nebula-article-header__author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nebula-article-header__avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.nebula-article-header__author-info {
    display: flex;
    flex-direction: column;
}

.nebula-article-header__author-name {
    font-size: 0.95rem;
    font-weight: var(--nebula-font-semibold, 600);
    color: var(--nebula-text, #1E293B);
    text-decoration: none;
}

.nebula-article-header__author-name:hover {
    color: var(--nebula-primary, #0EA5E9);
}

.nebula-article-header__date {
    font-size: 0.8rem;
    color: var(--nebula-text-muted, #94A3B8);
}

.nebula-article-header__stats {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nebula-article-header__views,
.nebula-article-header__comments {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--nebula-text-secondary, #64748b);
}

.nebula-article-header__share {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nebula-article-header__share-label {
    font-size: 0.875rem;
    color: var(--nebula-text-muted, #94A3B8);
}

.nebula-article-header__share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--nebula-bg, #FFFFFF);
    border: 1px solid var(--nebula-border, #E2E8F0);
    border-radius: 50%;
    color: var(--nebula-text-secondary, #64748b);
    cursor: pointer;
    transition: all var(--nebula-duration-fast, 0.15s);
}

.nebula-article-header__share-btn:hover {
    background: var(--nebula-primary, #0EA5E9);
    border-color: var(--nebula-primary, #0EA5E9);
    color: #fff;
}

/* Featured Image */
.nebula-article-featured-image {
    padding: 32px 0;
    background: var(--nebula-bg, #FFFFFF);
}

.nebula-article-featured-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--nebula-radius-xl, 16px);
    box-shadow: var(--nebula-shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.1));
}

/* Article Content Wrapper */
.nebula-article-content-wrapper {
    padding: 48px 0;
}

.nebula-article-layout {
    display: flex;
    gap: 48px;
    align-items: flex-start;
}

.nebula-article-main {
    flex: 1;
    min-width: 0;
}

/* Article Content */
.nebula-article-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--nebula-text, #1E293B);
    max-width: 720px;
}

.nebula-article-content h2 {
    font-size: 1.75rem;
    font-weight: var(--nebula-font-bold, 700);
    color: var(--nebula-text, #1E293B);
    margin: 40px 0 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--nebula-border, #E2E8F0);
}

.nebula-article-content h3 {
    font-size: 1.35rem;
    font-weight: var(--nebula-font-bold, 700);
    color: var(--nebula-text, #1E293B);
    margin: 32px 0 16px;
}

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

.nebula-article-content a {
    color: var(--nebula-primary, #0EA5E9);
    text-decoration: underline;
}

.nebula-article-content a:hover {
    color: var(--nebula-primary-hover, #0284C7);
}

.nebula-article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--nebula-radius-lg, 12px);
    margin: 24px 0;
}

.nebula-article-content blockquote {
    position: relative;
    margin: 32px 0;
    padding: 24px 32px;
    background: var(--nebula-bg-secondary, #F8FAFC);
    border-left: 4px solid var(--nebula-primary, #0EA5E9);
    border-radius: 0 var(--nebula-radius-lg, 12px) var(--nebula-radius-lg, 12px) 0;
    font-style: italic;
}

.nebula-article-content blockquote p:last-child {
    margin-bottom: 0;
}

.nebula-article-content pre,
.nebula-article-content code {
    font-family: var(--nebula-font-mono, monospace);
}

.nebula-article-content pre {
    background: var(--nebula-secondary, #0F172A);
    color: #E2E8F0;
    padding: 20px 24px;
    border-radius: var(--nebula-radius-lg, 12px);
    overflow-x: auto;
    margin: 24px 0;
}

.nebula-article-content code {
    background: var(--nebula-bg-secondary, #F8FAFC);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

.nebula-article-content pre code {
    background: transparent;
    padding: 0;
}

.nebula-article-content ul,
.nebula-article-content ol {
    margin: 20px 0;
    padding-left: 28px;
}

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

.nebula-article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
}

.nebula-article-content th,
.nebula-article-content td {
    padding: 12px 16px;
    border: 1px solid var(--nebula-border, #E2E8F0);
}

.nebula-article-content th {
    background: var(--nebula-bg-secondary, #F8FAFC);
    font-weight: var(--nebula-font-semibold, 600);
}

.nebula-article-content tr:hover {
    background: var(--nebula-bg-secondary, #F8FAFC);
}

/* Alert Boxes - 警告提示框 */
.nebula-article-content .wp-block-alert,
.nebula-article-content .alert,
.nebula-article-content [class*="alert-"] {
    position: relative;
    margin: 24px 0;
    padding: 16px 20px 16px 56px;
    border-radius: var(--nebula-radius-lg, 12px);
    font-size: 0.95rem;
    line-height: 1.6;
}

.nebula-article-content .wp-block-alert::before,
.nebula-article-content .alert::before,
.nebula-article-content [class*="alert-"]::before {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
}

.nebula-article-content .alert-info,
.nebula-article-content .alert-info {
    background: #E0F2FE;
    color: #0369A1;
    border-left: 4px solid #0EA5E9;
}

.nebula-article-content .alert-info::before { content: "💡"; }

.nebula-article-content .alert-success,
.nebula-article-content .alert-tip {
    background: #D1FAE5;
    color: #065F46;
    border-left: 4px solid #10B981;
}

.nebula-article-content .alert-success::before { content: "✅"; }
.nebula-article-content .alert-tip::before { content: "👍"; }

.nebula-article-content .alert-warning,
.nebula-article-content .alert-caution {
    background: #FEF3C7;
    color: #92400E;
    border-left: 4px solid #F59E0B;
}

.nebula-article-content .alert-warning::before { content: "⚠️"; }
.nebula-article-content .alert-caution::before { content: "🚨"; }

.nebula-article-content .alert-error,
.nebula-article-content .alert-danger {
    background: #FEE2E2;
    color: #991B1B;
    border-left: 4px solid #EF4444;
}

.nebula-article-content .alert-error::before { content: "❌"; }
.nebula-article-content .alert-danger::before { content: "🔴"; }

/* Callout Box - 引用提示框 */
.nebula-article-content .callout {
    margin: 24px 0;
    padding: 20px 24px;
    background: var(--nebula-bg-secondary, #F8FAFC);
    border-radius: var(--nebula-radius-lg, 12px);
    border: 1px solid var(--nebula-border, #E2E8F0);
}

.nebula-article-content .callout-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--nebula-text, #1E293B);
}

.nebula-article-content .callout-icon {
    font-size: 1.25rem;
}

/* Image Caption - 图片说明 */
.nebula-article-content figure {
    margin: 24px 0;
}

.nebula-article-content figcaption {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--nebula-text-muted, #94A3B8);
    text-align: center;
}

.nebula-article-content .wp-caption {
    max-width: 100%;
}

.nebula-article-content .wp-caption-text {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--nebula-text-muted, #94A3B8);
    text-align: center;
}

/* Keyboard Keys - 键盘按键 */
.nebula-article-content kbd {
    display: inline-block;
    padding: 4px 8px;
    font-family: var(--nebula-font-mono, monospace);
    font-size: 0.85em;
    background: var(--nebula-bg-secondary, #F1F5F9);
    border: 1px solid var(--nebula-border, #E2E8F0);
    border-radius: 4px;
    box-shadow: 0 1px 1px rgba(0,0,0,0.05);
}

/* Definition Lists - 定义列表 */
.nebula-article-content dl {
    margin: 20px 0;
}

.nebula-article-content dt {
    font-weight: var(--nebula-font-semibold, 600);
    margin-top: 16px;
}

.nebula-article-content dd {
    margin-left: 24px;
    color: var(--nebula-text-secondary, #64748b);
}

/* Abbreviation */
.nebula-article-content abbr[title] {
    cursor: help;
    text-decoration: underline dotted;
}

/* Mark/Highlight - 标记高亮 */
.nebula-article-content mark,
.nebula-article-content .highlight {
    background: #FEF08A;
    color: #713F12;
    padding: 2px 4px;
    border-radius: 3px;
}

/* Small - 小字 */
.nebula-article-content small,
.nebula-article-content .text-small {
    font-size: 0.85em;
    color: var(--nebula-text-muted, #94A3B8);
}

/* Cite - 引用 */
.nebula-article-content cite {
    font-style: italic;
    color: var(--nebula-text-secondary, #64748b);
}

/* Address */
.nebula-article-content address {
    margin: 20px 0;
    font-style: normal;
}

/* Details/Summary - 可折叠内容 */
.nebula-article-content details {
    margin: 20px 0;
    padding: 16px;
    background: var(--nebula-bg-secondary, #F8FAFC);
    border-radius: var(--nebula-radius-lg, 12px);
    border: 1px solid var(--nebula-border, #E2E8F0);
}

.nebula-article-content summary {
    font-weight: var(--nebula-font-semibold, 600);
    cursor: pointer;
    list-style: none;
}

.nebula-article-content summary::before {
    content: "▶";
    display: inline-block;
    margin-right: 8px;
    transition: transform 0.2s;
}

.nebula-article-content details[open] summary::before {
    transform: rotate(90deg);
}

/* Syntax Highlighting - 代码语法高亮 */
.nebula-article-content pre {
    position: relative;
    margin: 24px 0;
    padding: 20px 24px;
    background: #1E293B;
    border-radius: var(--nebula-radius-lg, 12px);
    overflow-x: auto;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    color: #E2E8F0;
}

.nebula-article-content pre::before {
    content: attr(data-lang);
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 0.75rem;
    color: #64748B;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nebula-article-content .language-bash pre,
.nebula-article-content pre.language-bash { background: #1E1E1E; }
.nebula-article-content .language-python pre,
.nebula-article-content pre.language-python { background: #2D3748; }
.nebula-article-content .language-javascript pre,
.nebula-article-content pre.language-javascript { background: #1E293B; }
.nebula-article-content .language-php pre,
.nebula-article-content pre.language-php { background: #4A5568; }
.nebula-article-content .language-sql pre,
.nebula-article-content pre.language-sql { background: #2D3748; }
.nebula-article-content .language-json pre,
.nebula-article-content pre.language-json { background: #1E293B; }

/* Code line numbers */
.nebula-article-content pre ol {
    counter-reset: line;
    padding-left: 0;
    list-style: none;
}

.nebula-article-content pre ol li {
    counter-increment: line;
    padding-left: 2em;
    position: relative;
}

.nebula-article-content pre ol li::before {
    content: counter(line);
    position: absolute;
    left: 0;
    width: 2em;
    color: #475569;
    text-align: right;
    padding-right: 1em;
}

/* Better Table Styling - 增强表格 */
.nebula-article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.9375rem;
    border-radius: var(--nebula-radius-lg, 12px);
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.nebula-article-content th,
.nebula-article-content td {
    padding: 14px 16px;
    border: 1px solid var(--nebula-border, #E2E8F0);
    text-align: left;
}

.nebula-article-content th {
    background: var(--nebula-bg-secondary, #F8FAFC);
    font-weight: var(--nebula-font-semibold, 600);
    color: var(--nebula-text, #1E293B);
}

.nebula-article-content tr:nth-child(even) {
    background: rgba(248, 250, 252, 0.5);
}

.nebula-article-content tr:hover {
    background: var(--nebula-bg-secondary, #F8FAFC);
}

.nebula-article-content td:first-child,
.nebula-article-content th:first-child {
    border-left: none;
}

.nebula-article-content td:last-child,
.nebula-article-content th:last-child {
    border-right: none;
}

/* Responsive Table with horizontal scroll */
.nebula-article-content .table-responsive {
    overflow-x: auto;
    margin: 24px 0;
}

.nebula-article-content .table-responsive table {
    min-width: 600px;
}

/* Article Tags */
.nebula-article-tags {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--nebula-border, #E2E8F0);
}

.nebula-article-tags__label {
    font-size: 0.875rem;
    font-weight: var(--nebula-font-semibold, 600);
    color: var(--nebula-text-secondary, #64748b);
}

.nebula-article-tags__tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--nebula-bg-secondary, #F8FAFC);
    border: 1px solid var(--nebula-border, #E2E8F0);
    border-radius: var(--nebula-radius-full, 9999px);
    font-size: 0.85rem;
    color: var(--nebula-text-secondary, #64748b);
    text-decoration: none;
    transition: all var(--nebula-duration-fast, 0.15s);
}

.nebula-article-tags__tag:hover {
    background: var(--nebula-primary, #0EA5E9);
    border-color: var(--nebula-primary, #0EA5E9);
    color: #fff;
}

/* Article Actions */
.nebula-article-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 32px;
    padding: 24px;
    background: var(--nebula-bg-secondary, #F8FAFC);
    border-radius: var(--nebula-radius-xl, 16px);
}

.nebula-article-actions__like {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--nebula-bg, #FFFFFF);
    border: 2px solid var(--nebula-primary, #0EA5E9);
    border-radius: var(--nebula-radius-full, 9999px);
    color: var(--nebula-primary, #0EA5E9);
    font-size: 0.95rem;
    font-weight: var(--nebula-font-semibold, 600);
    cursor: pointer;
    transition: all var(--nebula-duration-fast, 0.15s);
}

.nebula-article-actions__like:hover {
    background: var(--nebula-primary, #0EA5E9);
    color: #fff;
}

.nebula-article-actions__like.liked {
    background: var(--nebula-error, #EF4444);
    border-color: var(--nebula-error, #EF4444);
    color: #fff;
}

.nebula-article-actions__share {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.875rem;
    color: var(--nebula-text-secondary, #64748b);
}

.nebula-article-actions__share-btn {
    padding: 8px 16px;
    background: var(--nebula-bg, #FFFFFF);
    border: 1px solid var(--nebula-border, #E2E8F0);
    border-radius: var(--nebula-radius-md, 8px);
    color: var(--nebula-text-secondary, #64748b);
    cursor: pointer;
    transition: all var(--nebula-duration-fast, 0.15s);
}

.nebula-article-actions__share-btn:hover {
    background: var(--nebula-primary, #0EA5E9);
    border-color: var(--nebula-primary, #0EA5E9);
    color: #fff;
}

/* Copyright and Disclaimer */
.nebula-article-copyright {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--nebula-border, #E2E8F0);
}

.nebula-copyright-info,
.nebula-disclaimer {
    display: flex;
    gap: 16px;
    padding: 16px 20px;
    border-radius: var(--nebula-radius-lg, 12px);
    align-items: flex-start;
}

.nebula-copyright-info {
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.08), rgba(2, 132, 199, 0.05));
    border: 1px solid rgba(14, 165, 233, 0.2);
}

.nebula-copyright-info__icon,
.nebula-disclaimer__icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nebula-copyright-info__content,
.nebula-disclaimer__content {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.nebula-copyright-info__label,
.nebula-disclaimer__title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--nebula-text-secondary, #64748b);
}

.nebula-copyright-info__text {
    font-size: 0.95rem;
    color: var(--nebula-text, #1E293B);
    line-height: 1.6;
}

.nebula-disclaimer {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(217, 119, 6, 0.05));
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.nebula-disclaimer__title {
    color: #B45309;
}

.nebula-disclaimer__text {
    font-size: 0.9rem;
    color: var(--nebula-text-secondary, #64748b);
    line-height: 1.7;
}

/* Article Navigation */
.nebula-article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 40px;
}

.nebula-article-nav__item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px;
    background: var(--nebula-bg, #FFFFFF);
    border: 1px solid var(--nebula-border, #E2E8F0);
    border-radius: var(--nebula-radius-lg, 12px);
    text-decoration: none;
    transition: all var(--nebula-duration-fast, 0.15s);
}

.nebula-article-nav__item:hover {
    border-color: var(--nebula-primary, #0EA5E9);
    box-shadow: var(--nebula-shadow-md, 0 4px 6px rgba(0, 0, 0, 0.07));
}

.nebula-article-nav__item--next {
    text-align: right;
}

.nebula-article-nav__label {
    font-size: 0.8rem;
    color: var(--nebula-text-muted, #94A3B8);
}

.nebula-article-nav__title {
    font-size: 0.95rem;
    font-weight: var(--nebula-font-medium, 500);
    color: var(--nebula-text, #1E293B);
}

/* Article Sidebar */
.nebula-article-sidebar {
    width: 320px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
}

/* Related Posts */
.nebula-related-posts {
    padding: 60px 0;
    background: var(--nebula-bg-secondary, #F8FAFC);
}

.nebula-related-posts__title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--nebula-text-2xl, 1.5rem);
    font-weight: var(--nebula-font-bold, 700);
    color: var(--nebula-text, #1E293B);
    margin-bottom: 32px;
}

.nebula-related-posts__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.nebula-related-post {
    background: var(--nebula-bg, #FFFFFF);
    border-radius: var(--nebula-radius-xl, 16px);
    overflow: hidden;
    box-shadow: var(--nebula-shadow-card, 0 4px 20px rgba(0, 0, 0, 0.08));
    transition: all var(--nebula-duration-normal, 0.2s);
}

.nebula-related-post:hover {
    transform: translateY(-4px);
    box-shadow: var(--nebula-shadow-card-hover, 0 8px 30px rgba(0, 0, 0, 0.12));
}

.nebula-related-post__thumbnail {
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.nebula-related-post__thumbnail a {
    display: block;
    width: 100%;
    height: 100%;
}

.nebula-related-post__thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--nebula-duration-slow, 0.3s);
}

.nebula-related-post:hover .nebula-related-post__thumbnail img {
    transform: scale(1.05);
}

.nebula-related-post__content {
    padding: 16px;
}

.nebula-related-post__title {
    font-size: 1rem;
    font-weight: var(--nebula-font-semibold, 600);
    color: var(--nebula-text, #1E293B);
    margin-bottom: 8px;
    line-height: 1.4;
}

.nebula-related-post__title a {
    color: inherit;
    text-decoration: none;
}

.nebula-related-post__title a:hover {
    color: var(--nebula-primary, #0EA5E9);
}

.nebula-related-post__date {
    font-size: 0.8rem;
    color: var(--nebula-text-muted, #94A3B8);
}

/* Article Table of Contents */
.nebula-article-toc {
    width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
    align-self: flex-start;
}

.nebula-toc {
    background: var(--nebula-bg, #FFFFFF);
    border-radius: var(--nebula-radius-xl, 16px);
    box-shadow: var(--nebula-shadow-card, 0 4px 20px rgba(0, 0, 0, 0.08));
    border: 1px solid var(--nebula-border, #E2E8F0);
    overflow: hidden;
}

.nebula-toc__header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--nebula-primary, #0EA5E9), #0284C7);
    color: #fff;
}

.nebula-toc__icon {
    font-size: 1.25rem;
}

.nebula-toc__title {
    font-size: 0.95rem;
    font-weight: 600;
}

.nebula-toc__nav {
    padding: 16px 20px;
    max-height: 400px;
    overflow-y: auto;
}

.nebula-toc__nav::-webkit-scrollbar {
    width: 4px;
}

.nebula-toc__nav::-webkit-scrollbar-thumb {
    background: var(--nebula-border, #E2E8F0);
    border-radius: 2px;
}

.nebula-toc-item {
    display: block;
    padding: 8px 12px;
    font-size: 0.875rem;
    color: var(--nebula-text-secondary, #64748b);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s ease;
    margin-bottom: 4px;
    border-left: 2px solid transparent;
}

.nebula-toc-item:hover {
    background: var(--nebula-bg-secondary, #F8FAFC);
    color: var(--nebula-primary, #0EA5E9);
    border-left-color: var(--nebula-primary, #0EA5E9);
}

.nebula-toc-item.active {
    background: rgba(14, 165, 233, 0.1);
    color: var(--nebula-primary, #0EA5E9);
    border-left-color: var(--nebula-primary, #0EA5E9);
    font-weight: 500;
}

.nebula-toc-item--h3 {
    padding-left: 24px;
    font-size: 0.825rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .nebula-article-layout {
        flex-direction: column;
    }

    .nebula-article-sidebar {
        width: 100%;
        position: static;
    }

    .nebula-article-toc {
        width: 100%;
        position: static;
        margin-bottom: 24px;
    }
}

@media (max-width: 768px) {
    .nebula-article-header {
        padding: 32px 0 24px;
    }

    .nebula-article-header__title {
        font-size: var(--nebula-text-2xl, 1.5rem);
    }

    .nebula-article-header__meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .nebula-article-content {
        font-size: 1rem;
    }

    .nebula-article-nav {
        grid-template-columns: 1fr;
    }

    .nebula-article-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .nebula-article-actions__like {
        justify-content: center;
    }

    .nebula-related-posts__grid {
        grid-template-columns: 1fr;
    }
}