.lesson-question{margin:2rem 0;padding:1.4rem 1.6rem;border-left:3px solid var(--c);background:var(--panel2)}
.thesis-download{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-top:1.5rem}
.dimension-toggle{display:inline-flex;border:1px solid var(--line);border-radius:4px;overflow:hidden}.dimension-toggle button{border:0;border-radius:0;background:transparent;color:var(--muted);padding:.55rem .8rem}.dimension-toggle button.active{background:var(--accent);color:#111}.graph-3d{position:absolute;inset:0 320px 0 0;background:#070910}.graph-3d.hidden{display:none}.graph-3d canvas{display:block}.graph-shell.mode-3d #graphCanvas{display:none}@media(max-width:900px){.graph-3d{right:0;bottom:260px}}.thesis-download a{display:inline-block;background:var(--accent);color:#111;padding:.85rem 1.1rem;text-decoration:none;font-weight:700}.thesis-download span{color:var(--muted);font-size:.82rem}.lesson-question span,.arch-detail-head span{font:700 .72rem var(--sans);letter-spacing:.15em;color:var(--c)}.lesson-question p{font:1.45rem/1.4 var(--serif);margin:.6rem 0 0}.lesson-overview{max-width:900px;font-size:1.02rem;line-height:1.75}.lesson-overview h4,.lesson-title{font:1.55rem var(--serif);margin:2rem 0 .7rem}.lesson-overview li,.lesson-columns li,.arch-detail-grid li{margin:.45rem 0;line-height:1.55}.bridge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.bridge-grid article{background:var(--panel2);border-top:2px solid var(--c);padding:1.35rem}.bridge-grid h4{font:1.25rem var(--serif);margin:0 0 .65rem}.bridge-grid p{color:var(--muted);line-height:1.65;margin:0}.lesson-columns{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin:2rem 0}.lesson-columns>div{padding:1.5rem;background:var(--panel2)}.lesson-columns h4{font:1.35rem var(--serif);margin-top:0}.timeline-item a{color:var(--c);font-weight:700;text-decoration:none}.architecture-detail{margin:1.5rem 0 3rem;border:1px solid var(--line);background:var(--panel);padding:clamp(1.3rem,3vw,2.5rem)}.arch-node{cursor:pointer;transition:.2s}.arch-node:hover,.arch-node.active{border-color:var(--accent);transform:translateY(-2px)}.arch-node>b{display:block;color:var(--accent);font-size:.72rem;margin-top:1rem}.arch-detail-head{max-width:850px;border-bottom:1px solid var(--line);padding-bottom:1.5rem}.arch-detail-head h3{font:2.2rem var(--serif);margin:.35rem 0}.arch-detail-head p{font-size:1.05rem;line-height:1.65;color:var(--muted)}.arch-detail-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;margin-top:1.5rem}.arch-detail-grid>div{background:var(--panel2);padding:1.2rem}.arch-detail-grid h4{margin:0 0 .7rem;color:var(--accent);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase}.arch-detail-grid ul{padding-left:1.1rem;margin:0;color:var(--muted)}@media(max-width:900px){.bridge-grid,.arch-detail-grid{grid-template-columns:1fr}.lesson-columns{grid-template-columns:1fr}}