/* ===== Layout ===== */
.doc-wrap{display:flex;gap:2rem;width:100%;min-height:100vh;padding:2rem 1.5rem 4rem;align-items:flex-start;background:#fafaf9}
.doc-sidebar{flex:0 0 220px;position:sticky;top:2rem;max-height:calc(100vh - 4rem);overflow-y:auto;font-size:0.82rem;line-height:1.6;padding-right:0.5rem}
.doc-sidebar h3{font-size:0.85rem;font-weight:600;color:#292524;margin-bottom:0.75rem;letter-spacing:0.05em;text-transform:uppercase}
.doc-sidebar ul{list-style:none;padding:0;margin:0}
.doc-sidebar li{margin-bottom:0.15rem}
.doc-sidebar a{color:#a8a29e;text-decoration:none;display:block;padding:0.2rem 0;border-left:2px solid transparent;padding-left:0.75rem;transition:color 0.15s,border-color 0.15s;font-size:0.8rem}
.doc-sidebar a:hover,.doc-sidebar a:focus,.doc-sidebar a.active{color:#1c1917;border-left-color:#1c1917}
.doc-sidebar .toc-h2 a{font-weight:500}
.doc-sidebar .toc-h3 a{padding-left:1.5rem;font-size:0.78rem}
.doc-sidebar::-webkit-scrollbar{width:4px}
.doc-sidebar::-webkit-scrollbar-thumb{background:#e7e5e4;border-radius:2px}
.doc-main{flex:1;min-width:0;width:100%}
.doc-main .doc{max-width:none;padding:0}
/* Content area - centered for readability with max cap */
.doc-content{padding:0 2rem 2rem 0}
/* ===== Architecture diagram ===== */
.arch-diagram{background:#fff;border:1px solid #e7e5e4;border-radius:10px;padding:1.5rem 1.5rem 1.8rem;margin-bottom:2.5rem;text-align:center}
.arch-diagram h2{font-size:1rem;font-weight:600;color:#44403c;margin:0 0 1.2rem;border:none;padding:0;letter-spacing:0.03em}
.arch-flow{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:0.4rem}
.arch-node{background:#f5f5f4;border:1px solid #d6d3d1;border-radius:8px;padding:0.6rem 1rem;font-size:0.82rem;font-weight:500;color:#44403c;white-space:nowrap}
.arch-node .icon{display:block;font-size:1.2rem;margin-bottom:0.2rem}
.arch-node .label{display:block}
.arch-node .sub{display:block;font-size:0.72rem;font-weight:400;color:#a8a29e;margin-top:0.1rem}
.arch-arrow{font-size:1.1rem;color:#d6d3d1;font-weight:300;padding:0 0.2rem}
.arch-detail{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:0.5rem;margin-top:1.2rem;padding-top:1rem;border-top:1px solid #f0f0ef;text-align:left}
.arch-detail-item{font-size:0.76rem;color:#a8a29e;line-height:1.5}
.arch-detail-item strong{display:block;color:#57534e;font-size:0.78rem;margin-bottom:0.1rem}
/* ===== Typography ===== */
.doc{font-family:"Noto Serif SC","Source Han Serif SC","STSong","SimSun",Georgia,"Times New Roman",serif;background:#fafaf9;color:#1c1917;font-size:16px;line-height:1.9;-webkit-font-smoothing:antialiased}
.doc h1{font-size:1.7rem;font-weight:700;color:#1c1917;margin-bottom:0.5rem;line-height:1.35;letter-spacing:-0.02em}
.doc h2{font-size:1.3rem;font-weight:600;color:#1c1917;margin-top:3rem;margin-bottom:1rem;padding-bottom:0.4rem;border-bottom:1px solid #e7e5e4;letter-spacing:-0.01em}
.doc h3{font-size:1.1rem;font-weight:600;color:#44403c;margin-top:2rem;margin-bottom:0.75rem}
.doc h4{font-size:1rem;font-weight:600;color:#57534e;margin-top:1.5rem;margin-bottom:0.5rem}
.doc p{margin-bottom:1rem}
.doc p.lead,.doc p.sig,.doc p.era-tag{text-indent:0}
.doc .lead{font-size:1.05rem;color:#78716c;margin-bottom:2rem;line-height:1.8}
.doc .sig{margin-top:3rem;color:#a8a29e;font-style:italic;text-align:center;font-size:0.9rem}
.doc .era-tag{font-size:0.85rem;color:#a8a29e;margin-bottom:1.5rem}
.doc ul,.doc ol{margin-bottom:1rem;padding-left:1.5rem}
.doc li{margin-bottom:0.4rem}
.doc li p{text-indent:0;margin-bottom:0.3rem}
.doc code{background:#f5f5f4;padding:0.15rem 0.4rem;border-radius:4px;font-size:0.88em;color:#44403c;font-family:"SF Mono","Fira Code","Cascadia Code",monospace}
.doc pre{background:#f5f5f4;border:1px solid #e7e5e4;border-radius:8px;padding:1rem;overflow-x:auto;font-size:0.82rem;line-height:1.6;margin-bottom:1.5rem;color:#44403c;font-family:"SF Mono","Fira Code","Cascadia Code",monospace}
.doc table{width:100%;border-collapse:collapse;margin-bottom:1.5rem;font-size:0.85rem}
.doc th,.doc td{border:1px solid #e7e5e4;padding:0.5rem 0.75rem;text-align:left}
.doc th{background:#f5f5f4;color:#44403c;font-weight:600}
.doc td{color:#57534e}
.doc a{color:#78716c;text-decoration:underline;text-underline-offset:3px}
.doc a:hover{color:#292524}
.doc strong{color:#1c1917}
/* ===== Responsive ===== */
@media (max-width:900px){.doc-content{padding:0}
.doc-wrap{flex-direction:column;padding:1.5rem 1rem 3rem;gap:0}
.doc-sidebar{position:static;flex:none;max-height:none;width:100%;overflow-y:visible;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid #e7e5e4;background:#fafaf9}
.doc-sidebar .toc-h3 a{padding-left:1.2rem}
.doc-main{width:100%}
.doc-content{max-width:100%}
.arch-diagram{padding:1rem}
.arch-node{padding:0.4rem 0.7rem;font-size:0.75rem}
}
@media (max-width:600px){
.doc-main .doc{font-size:15px;padding:0}
.doc-main .doc h1{font-size:1.35rem}
.arch-flow{gap:0.25rem}
.arch-arrow{font-size:0.8rem;padding:0}
.arch-detail{grid-template-columns:repeat(2,1fr)}
}