:root {
  --paper: #f6f3ec;
  --paper-2: #efeadf;
  --card: #fffdf8;
  --ink: #17181c;
  --ink-2: #4a4c55;
  --muted: #6d6f78;
  --line: #ddd6c7;
  --accent: #d9481f;
  --accent-ink: #ffffff;
  --accent-soft: #fbe3d9;
  --good: #1f7a4d;
  --good-soft: #dcf1e5;
  --bad: #b3261e;
  --bad-soft: #f9dedc;
  --code-bg: #1d1f24;
  --code-ink: #e9e6de;
  --warn: #8a5a00;
  --warn-soft: #fbedc9;
  --serif: "Fraunces", Georgia, serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --radius: 14px;
  --maxw: 1160px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121316; --paper-2: #1a1c20; --card: #1b1d22;
    --ink: #eeebe3; --ink-2: #c3c0b8; --muted: #8f8d87; --line: #2e3037;
    --accent: #ff7a50; --accent-ink: #1a0d07; --accent-soft: #3a2018;
    --good: #5fd39a; --good-soft: #15301f; --bad: #ff8a80; --bad-soft: #3a1a18;
    --code-bg: #0b0c0e; --code-ink: #e9e6de;
    --warn: #f0c060; --warn-soft: #33290f;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.65 var(--sans); }
a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
img { max-width: 100%; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.02em; }
.muted { color: var(--muted); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; border-radius: 6px; z-index: 10; }
.skip:focus { left: 8px; }

/* header */
.site-header { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; text-decoration: none; font-size: 1.05rem; }
.logo b { color: var(--accent); font-weight: 600; }
.logo-mark { font-family: var(--mono); background: var(--ink); color: var(--paper); border-radius: 7px; padding: 2px 7px; font-size: 0.85rem; }
.logo.small { margin: 0 0 8px; }
.site-nav { display: flex; gap: 4px; }
.site-nav a { text-decoration: none; padding: 8px 12px; border-radius: 8px; font-size: 0.95rem; color: var(--ink-2); }
.site-nav a:hover, .site-nav a[aria-current] { background: var(--paper-2); color: var(--ink); }
.menu-btn { display: none; font: 500 0.9rem var(--sans); background: none; border: 1px solid var(--line); color: var(--ink); border-radius: 8px; padding: 6px 12px; }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; border: 1px solid var(--ink); background: transparent; color: var(--ink); font: 500 0.95rem var(--sans); text-decoration: none; cursor: pointer; transition: transform .12s, background .12s; }
.btn:hover { background: var(--paper-2); color: var(--ink); transform: translateY(-1px); }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.small { padding: 8px 14px; font-size: 0.88rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* hero */
.hero { padding: 72px 0 48px; border-bottom: 1px solid var(--line); background:
  radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--ink) 9%, transparent) 1px, transparent 0) 0 0 / 22px 22px; }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 56px; align-items: center; }
.eyebrow { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 16px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 650; line-height: 1.15; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.6rem); margin: 0 0 18px; }
h1 em { font-style: italic; color: var(--accent); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); margin: 0 0 12px; }
h3 { font-size: 1.2rem; margin: 0 0 6px; }
.lede { font-size: 1.15rem; color: var(--ink-2); max-width: 62ch; margin: 0; }
.hero-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 0 0 22px; box-shadow: 0 1px 0 var(--line), 0 18px 40px -24px rgba(0,0,0,.35); overflow: hidden; }
.hero-card-head { display: flex; gap: 6px; align-items: center; padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--paper-2); }
.hero-card-head .mono { margin-left: 8px; color: var(--muted); }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.q-label { color: var(--accent); margin: 20px 22px 6px; }
.hero-q { font-family: var(--serif); font-size: 1.3rem; line-height: 1.35; margin: 0 22px 14px; }
.hero-ans { margin: 0 22px; }
.hero-ans summary { cursor: pointer; font-weight: 500; color: var(--accent); }
.hero-ans p { color: var(--ink-2); font-size: 0.95rem; }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); }
.stats div { padding: 26px 0; display: flex; flex-direction: column; border-right: 1px solid var(--line); padding-left: 24px; }
.stats div:first-child { padding-left: 0; }
.stats div:last-child { border-right: none; }
.stats b { font-family: var(--serif); font-size: 2.2rem; line-height: 1; }
.stats span { color: var(--muted); font-size: 0.9rem; margin-top: 6px; }

/* sections */
.section { padding: 56px 24px 8px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.section-head p { margin: 0; }
.topic-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.topic-card, .feature { display: flex; flex-direction: column; gap: 6px; text-decoration: none; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; transition: border-color .15s, transform .15s; }
.topic-card:hover, .feature:hover { border-color: var(--ink); transform: translateY(-2px); color: var(--ink); }
.topic-card p, .feature p { margin: 0; color: var(--ink-2); }
.topic-num { font-family: var(--mono); color: var(--accent); font-size: 0.85rem; }
.topic-num.big { font-size: 1rem; margin: 0 0 6px; }
.topic-card .meta { margin-top: auto; padding-top: 14px; font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature .mono { color: var(--accent); }

/* page heads */
.page-head { padding-top: 48px; padding-bottom: 28px; }
.crumbs { font-size: 0.88rem; color: var(--muted); margin: 0 0 18px; }
.crumbs a { color: var(--muted); }
.narrow { max-width: 760px; }
.center { text-align: center; }
.big-404 { font-size: 4rem; color: var(--accent); margin: 0; }

/* article list */
.article-list { border-top: 1px solid var(--line); }
.article-row { display: grid; grid-template-columns: 52px 1fr auto; gap: 18px; align-items: baseline; padding: 22px 4px; border-bottom: 1px solid var(--line); text-decoration: none; }
.article-row:hover { background: var(--paper-2); color: var(--ink); }
.article-row p { margin: 0; color: var(--ink-2); }
.article-row .idx { color: var(--accent); }
.q-preview { padding-left: 1.2em; }
.q-preview li { margin: 8px 0; }

/* article */
.article-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 56px; padding-top: 40px; padding-bottom: 40px; }
.toc { position: sticky; top: 88px; align-self: start; font-size: 0.9rem; max-height: calc(100vh - 110px); overflow: auto; }
.toc ul { list-style: none; padding: 0; margin: 8px 0 0; }
.toc li { margin: 6px 0; }
.toc a { text-decoration: none; color: var(--ink-2); }
.toc a:hover, .toc a[aria-current] { color: var(--accent); }
.toc-sep { margin-top: 28px; }
.prose { max-width: 72ch; }
.prose h1 { margin-bottom: 12px; }
.prose h2 { margin-top: 2.2em; padding-top: 0.6em; border-top: 1px solid var(--line); }
.prose h3 { margin-top: 1.8em; }
.prose code { font-family: var(--mono); font-size: 0.88em; background: var(--paper-2); border: 1px solid var(--line); padding: 1px 5px; border-radius: 5px; }
.prose pre { background: var(--code-bg); color: var(--code-ink); padding: 18px 20px; border-radius: 12px; overflow-x: auto; font-size: 0.86rem; line-height: 1.55; }
.prose pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 0.94rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font-weight: 600; background: var(--paper-2); }
.prose li { margin: 4px 0; }
.prose strong { font-weight: 600; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 56px; }
.pager a { display: flex; flex-direction: column; gap: 4px; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; background: var(--card); font-weight: 500; }
.pager a:hover { border-color: var(--ink); color: var(--ink); }
.pager .next { text-align: right; }
.pager span.muted { font-size: 0.85rem; font-weight: 400; }

/* filters */
.filters { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; padding: 18px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 18px; }
.filters label { display: flex; flex-direction: column; gap: 6px; font-size: 0.82rem; font-weight: 500; color: var(--ink-2); }
.filters input, .filters select { font: 0.95rem var(--sans); color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 9px; padding: 9px 12px; min-width: 180px; }
.filters label:first-child input { min-width: min(320px, 70vw); }

/* Q&A */
.qa { background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px; }
.qa summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 16px; padding: 18px 20px; align-items: flex-start; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::before { content: "+"; font-family: var(--mono); color: var(--accent); flex: none; width: 14px; }
.qa[open] summary::before { content: "–"; }
.qa-q { flex: 1; font-weight: 500; }
.tags { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; flex: none; }
.tag { font-family: var(--mono); font-size: 0.72rem; padding: 3px 8px; border-radius: 99px; background: var(--paper-2); color: var(--ink-2); white-space: nowrap; }
.lvl-junior { background: var(--good-soft); color: var(--good); }
.lvl-mid { background: var(--accent-soft); color: var(--accent); }
.lvl-senior { background: var(--ink); color: var(--paper); }
.qa-a { padding: 0 20px 18px 50px; color: var(--ink-2); }
.qa-a p { margin: 0; }
.qa-a .label, .quick-answer .label { color: var(--accent); margin: 0 0 6px; font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.06em; }
.full-link { display: inline-block; margin-top: 12px; font-weight: 600; color: var(--accent); text-decoration: none; }
.full-link:hover { text-decoration: underline; }

/* question pages */
.q-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 0 0 14px; }
.q-title { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
.quick-answer { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; padding: 16px 20px; margin: 18px 0; }
.quick-answer p:last-child { margin: 0; }
.tip { color: var(--muted); font-size: 0.92rem; }
.prose h2 .time, .timeline .time { font-family: var(--mono); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.02em; background: var(--accent-soft); color: var(--accent); border-radius: 99px; padding: 3px 9px; white-space: nowrap; vertical-align: middle; }
.prose h2 .time { margin-right: 10px; position: relative; top: -3px; }
.timeline li { margin: 9px 0; }
.timeline a { display: flex; flex-direction: column; gap: 3px; align-items: flex-start; }
.timeline .time { padding: 2px 8px; }
.timeline li.extra:first-of-type, .timeline li:not(.extra) + li.extra { margin-top: 18px; padding-top: 12px; border-top: 1px solid var(--line); }
.prose { min-width: 0; }
.article-layout .prose { max-width: none; }
.article-layout .prose > * { max-width: 72ch; }
.article-layout .prose > .diagram, .article-layout .prose > .pager { max-width: none; }
.prose pre, .prose table { max-width: 100%; }
.empty { text-align: center; padding: 40px; color: var(--muted); }

/* practice */
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button { font: 500 0.9rem var(--sans); padding: 9px 16px; border: 0; background: var(--paper); color: var(--ink-2); cursor: pointer; }
.seg button[aria-selected="true"] { background: var(--ink); color: var(--paper); }
.practice-root { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; min-height: 360px; }
.p-progress { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.82rem; color: var(--muted); margin-bottom: 8px; }
.bar { height: 4px; background: var(--paper-2); border-radius: 4px; overflow: hidden; margin-bottom: 26px; }
.bar span { display: block; height: 100%; background: var(--accent); transition: width .25s; }
.p-q { font-family: var(--serif); font-size: 1.45rem; line-height: 1.3; margin: 0 0 22px; }
.options { display: grid; gap: 10px; }
.option { text-align: left; font: 1rem var(--sans); color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; cursor: pointer; display: flex; gap: 12px; }
.option:hover:not(:disabled) { border-color: var(--ink); }
.option .key { font-family: var(--mono); color: var(--muted); }
.option.correct { background: var(--good-soft); border-color: var(--good); }
.option.wrong { background: var(--bad-soft); border-color: var(--bad); }
.option:disabled { cursor: default; }
.explain { margin-top: 18px; padding: 14px 16px; border-left: 3px solid var(--accent); background: var(--paper-2); border-radius: 0 10px 10px 0; }
.p-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }
.score { text-align: center; padding: 20px 0; }
.score b { font-family: var(--serif); font-size: 4rem; display: block; line-height: 1; }
.flashcard { perspective: 1200px; cursor: pointer; border: 0; background: none; padding: 0; width: 100%; display: block; color: var(--ink); font: inherit; text-align: left; }
.fc-inner { position: relative; min-height: 260px; transition: transform .45s; transform-style: preserve-3d; }
.flashcard.flipped .fc-inner { transform: rotateY(180deg); }
.fc-face { position: absolute; inset: 0; backface-visibility: hidden; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; display: flex; flex-direction: column; justify-content: center; background: var(--paper); }
.fc-back { transform: rotateY(180deg); background: var(--paper-2); }
.fc-face .mono { color: var(--accent); margin-bottom: 10px; }
.fc-face .p-q { margin: 0; }
.fc-answer { font-family: var(--serif); font-size: 1.35rem; margin: 0 0 12px; }
@media (prefers-reduced-motion: reduce) { .fc-inner, .btn, .topic-card, .feature { transition: none; } }

/* roadmap */
.roadmap { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.week { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.week header .mono { color: var(--accent); margin: 0 0 4px; }
.week header p.muted { margin: 0 0 14px; }
.progress { height: 4px; background: var(--paper-2); border-radius: 4px; overflow: hidden; }
.progress span { display: block; height: 100%; width: 0; background: var(--good); transition: width .25s; }
.checklist { list-style: none; padding: 0; margin: 16px 0 0; }
.checklist li { border-top: 1px solid var(--line); }
.checklist label { display: flex; gap: 12px; padding: 11px 0; cursor: pointer; align-items: flex-start; }
.checklist input { width: 18px; height: 18px; margin-top: 4px; accent-color: var(--good); flex: none; }
.checklist input:checked + span { color: var(--muted); text-decoration: line-through; }

/* footer */
.site-footer { margin-top: 80px; border-top: 1px solid var(--line); padding: 40px 0 28px; background: var(--paper-2); }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
.footer-inner p { margin: 0; }
.footer-links { display: flex; flex-direction: column; gap: 8px; font-size: 0.92rem; }
.footer-links a { text-decoration: none; color: var(--ink-2); }
.fine { margin-top: 28px; font-size: 0.8rem; }

/* responsive */
@media (max-width: 900px) {
  .hero-grid, .article-layout { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .toc { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .roadmap { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap, .section { padding-left: 16px; padding-right: 16px; }
  .menu-btn { display: inline-block; }
  .site-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px 16px 16px; }
  .site-nav.open { display: flex; }
  .hero { padding: 44px 0 32px; }
  .topic-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats div { padding-left: 0; border-right: none; border-bottom: 1px solid var(--line); }
  .stats div:nth-last-child(-n+2) { border-bottom: none; }
  .article-row { grid-template-columns: 36px 1fr; }
  .article-row > span:last-child { grid-column: 2; }
  .qa summary { flex-wrap: wrap; }
  .tags { justify-content: flex-start; width: 100%; padding-left: 30px; }
  .qa-a { padding-left: 20px; }
  .practice-root { padding: 20px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
  .footer-inner { grid-template-columns: 1fr; }
  .filters input, .filters select { min-width: 0; width: 100%; }
  .filters label { flex: 1 1 100%; }
}

/* architecture diagrams */
.diagram { margin: 28px 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 14px; }
.diagram-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.diagram svg.dg { display: block; width: 100%; min-width: 620px; height: auto; }
.diagram figcaption { margin-top: 12px; font-size: 0.92rem; color: var(--ink-2); }
.diagram figcaption b { color: var(--ink); }
.dg-hint { display: none; font-size: 0.78rem; color: var(--muted); margin: 0 0 6px; }
.dg-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); font-size: 0.78rem; color: var(--muted); }
.dg-legend span { display: inline-flex; align-items: center; gap: 6px; }
.dg-legend i { width: 14px; height: 10px; border-radius: 3px; border: 1.3px solid; display: inline-block; }
.dg-legend .k-svc { background: var(--card); border-color: var(--ink-2); }
.dg-legend .k-client { background: var(--paper-2); border-color: var(--ink-2); border-radius: 6px; }
.dg-legend .k-model { background: var(--accent-soft); border-color: var(--accent); }
.dg-legend .k-store { background: var(--paper-2); border-color: var(--ink-2); border-radius: 50% / 30%; }
.dg-legend .k-guard { background: var(--warn-soft); border-color: var(--warn); }
.dg-legend .k-ext { background: transparent; border-color: var(--muted); border-style: dashed; }
svg.dg .dg-svc { fill: var(--card); stroke: var(--ink-2); stroke-width: 1.3; }
svg.dg .dg-client { fill: var(--paper-2); stroke: var(--ink-2); stroke-width: 1.3; }
svg.dg .dg-model { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.4; }
svg.dg .dg-store { fill: var(--paper-2); stroke: var(--ink-2); stroke-width: 1.3; }
svg.dg .dg-guard { fill: var(--warn-soft); stroke: var(--warn); stroke-width: 1.4; }
svg.dg .dg-ext { fill: var(--card); stroke: var(--muted); stroke-width: 1.3; stroke-dasharray: 5 4; }
svg.dg .dg-decode { fill: var(--accent); stroke: var(--accent); }
svg.dg .dg-label { fill: var(--ink); font: 600 13px var(--sans); }
svg.dg .dg-sub { fill: var(--muted); font: 400 11px var(--sans); }
svg.dg .dg-note { fill: var(--ink-2); font: 400 12px var(--sans); }
svg.dg .dg-edge { fill: none; stroke: var(--ink-2); stroke-width: 1.4; stroke-linejoin: round; }
svg.dg .dg-edge.dashed { stroke-dasharray: 5 4; stroke: var(--muted); }
svg.dg .dg-tick { stroke: var(--line); stroke-width: 1; }
svg.dg .dg-ah { fill: var(--ink-2); }
svg.dg .dg-elabel { fill: var(--ink-2); font: 500 10.5px var(--mono); paint-order: stroke; stroke: var(--card); stroke-width: 5px; stroke-linejoin: round; }
svg.dg .dg-elabel.accent { fill: var(--accent); }
svg.dg .dg-group { fill: none; stroke: var(--line); stroke-width: 1.4; stroke-dasharray: 6 5; }
svg.dg .dg-group-label { fill: var(--muted); font: 500 10px var(--mono); letter-spacing: 0.08em; }

/* architecture hub */
.arch-section { margin-top: 44px; }
.arch-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.arch-card { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-decoration: none; transition: border-color .15s, transform .15s; }
.arch-card:hover { border-color: var(--ink); transform: translateY(-2px); color: var(--ink); }
.arch-thumb { padding: 14px; background: var(--paper); border-bottom: 1px solid var(--line); }
.arch-thumb svg.dg { width: 100%; height: auto; display: block; min-width: 0; }
.arch-body { padding: 16px 20px 20px; display: flex; flex-direction: column; gap: 6px; }
.arch-body h3 { margin: 0; }
.arch-body p { margin: 0; color: var(--ink-2); font-size: 0.93rem; }
.arch-body .q-meta { margin: 0; }
.arch-callout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 32px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; text-decoration: none; }
.arch-callout:hover { border-color: var(--ink); color: var(--ink); }
.arch-callout p { color: var(--ink-2); }
.arch-callout svg.dg { width: 100%; height: auto; min-width: 0; }
@media (max-width: 900px) { .arch-grid, .arch-callout { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 720px) { .dg-hint { display: block; } }