@import url('https://fonts.googleapis.com/css2?family=Inter:wght=300;400;500;600;700&display=swap');
        body { font-family: 'Inter', sans-serif; }
        ::-webkit-scrollbar { width: 6px; height: 6px; }
        ::-webkit-scrollbar-track { background: #f8fafc; }
        ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 9999px; }
        ::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
        #tabList::-webkit-scrollbar { height: 4px; width: 0; }
        #tabList { scrollbar-width: thin; scrollbar-color: #cbd5e1 transparent; }
        #readerMain.reader-main-expanded { max-width: none !important; }
        .reader-tab-pill { position: relative; }
        .reader-tab-pill.tab-dragging { opacity: 0.45; }
        .reader-tab-pill.tab-drop-before::before,
        .reader-tab-pill.tab-drop-after::after {
            background: #4f46e5;
            border-radius: 9999px;
            content: "";
            height: calc(100% - 0.5rem);
            position: absolute;
            top: 0.25rem;
            width: 3px;
            z-index: 20;
        }
        .reader-tab-pill.tab-drop-before::before { left: -3px; }
        .reader-tab-pill.tab-drop-after::after { right: -3px; }
        /* Safelist cho Tailwind scan các class dùng trong JS */
        .tw-safelist {
            --unused: border-b-2 border-indigo-500 border-transparent text-indigo-600
                      font-semibold text-slate-500 bg-slate-50 hover:bg-slate-100
                      hover:text-slate-700 text-emerald-600 text-amber-600 text-indigo-500
                      text-slate-400 rounded-t-md;
        }

.file-badge {
    background: #f1f5f9;
    border-radius: 0.25rem;
    color: #475569;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-weight: 700;
    padding: 0.125rem 0.375rem;
}

.markdown-body {
    color: #334155;
    font-size: 0.925rem;
    line-height: 1.75;
    overflow-wrap: anywhere;
}
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    scroll-margin-top: 80px;
    color: #0f172a;
    font-weight: 700;
    line-height: 1.3;
    margin: 1.5em 0 0.65em;
}
.markdown-body h1 { font-size: 2rem; }
.markdown-body h2 { font-size: 1.5rem; border-bottom: 1px solid #e2e8f0; padding-bottom: 0.35em; }
.markdown-body h3 { font-size: 1.25rem; }
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 { font-size: 1rem; }
.markdown-body h1:first-child,
.markdown-body h2:first-child,
.markdown-body h3:first-child,
.markdown-body p:first-child { margin-top: 0; }
.markdown-body p { margin: 0.8em 0; }
.markdown-body ul,
.markdown-body ol { margin: 0.8em 0; padding-left: 1.75rem; }
.markdown-body ul { list-style: disc; }
.markdown-body ol { list-style: decimal; }
.markdown-body li { margin: 0.25em 0; }
.markdown-body blockquote {
    border-left: 4px solid #818cf8;
    background: #eef2ff;
    color: #475569;
    margin: 1em 0;
    padding: 0.75rem 1rem;
}
.markdown-body code {
    background: #f1f5f9;
    border-radius: 0.3rem;
    color: #be123c;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.85em;
    padding: 0.15em 0.35em;
}
.markdown-body pre {
    background: #0f172a;
    border-radius: 0.75rem;
    color: #e2e8f0;
    margin: 1rem 0;
    overflow: auto;
    padding: 1rem;
}
.markdown-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}
.markdown-body a { color: #4f46e5; text-decoration: underline; }
.markdown-body hr { border: 0; border-top: 1px solid #cbd5e1; margin: 1.5rem 0; }
.markdown-body table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: 0.875rem; }
.markdown-body table th, .markdown-body table td { border: 1px solid #e2e8f0; padding: 0.5rem 0.75rem; text-align: left; }
.markdown-body table thead { background: #f8fafc; font-weight: 600; color: #475569; }
.markdown-body table tbody tr:nth-child(even) { background: #f8fafc; }

/* overflow: clip giữ bo góc nhưng không phá position:sticky (khác overflow:hidden) */
#markdownView { overflow: clip; }

/* TOC sidebar */
.md-toc-sidebar {
    width: 210px;
    flex-shrink: 0;
    border-right: 1px solid #e2e8f0;
    background: #f8fafc;
    padding: 1.25rem 0 1.5rem;
    position: sticky;
    top: 64px;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    align-self: flex-start;
}
.toc-heading {
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #94a3b8;
    padding: 0 0.75rem 0.5rem;
    margin: 0;
}
.toc-link {
    display: block;
    font-size: 0.75rem;
    color: #64748b;
    padding-top: 0.28rem;
    padding-bottom: 0.28rem;
    padding-right: 0.75rem;
    text-decoration: none;
    line-height: 1.4;
    border-left: 2px solid transparent;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.toc-link:hover { color: #4f46e5; background: #eff0fe; }
.toc-link.toc-active { color: #4f46e5; border-left-color: #4f46e5; font-weight: 600; background: #eff0fe; }
@media (max-width: 768px) { .md-toc-sidebar { display: none !important; } }