/* Case-study pages (work/<slug>/). Loaded after site.css and built only from its tokens: no new colours, dimmed states
   use opacity. Dark first, light through html[data-theme="light"] (set by the shared head script). The markup comes
   from tools/build_case_studies.py. The diagram player is assets/js/case-study.js. */

.cs { --accent-soft: color-mix(in srgb, var(--accent) 13%, transparent); }
html[data-theme="light"] .cs { --accent-soft: color-mix(in srgb, var(--accent) 10%, transparent); }
.cs section[id] { scroll-margin-top: 72px; }
.cs strong { color: var(--text); font-weight: 600; }
.cs h1, .cs h2, .cs h3 { text-wrap: balance; overflow-wrap: anywhere; hyphens: auto; }

/* Header: brand, breadcrumb, language switch, theme toggle */
.cs .nav { flex-wrap: nowrap; }
.cs .brand { flex: none; }
.cs .brand-name { white-space: nowrap; }
.cs .nav-actions { margin-left: auto; flex: none; }
.crumb { flex: 1 1 auto; min-width: 0; font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted); }
.crumb ol { display: flex; gap: 8px; margin: 0; padding: 0; list-style: none; min-width: 0; }
.crumb li { white-space: nowrap; }
.crumb li:last-child { min-width: 0; overflow: hidden; text-overflow: ellipsis; color: var(--text); }
.crumb li + li::before { content: "/"; margin-right: 8px; color: var(--muted); }
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--text); text-decoration: none; }
.lang { display: inline-flex; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; margin-right: 4px; }
.lang a { display: grid; place-items: center; min-width: 38px; height: 36px; padding: 0 10px; background: var(--surface); color: var(--muted); font: 600 0.78rem var(--font-mono); }
.lang a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.lang a[aria-current] { background: var(--accent); color: var(--accent-fg); }
.lang a:focus-visible { outline-offset: -3px; }

/* Hero */
.cs-hero { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 40px; align-items: start; padding-block: clamp(36px, 6vw, 56px) clamp(36px, 5vw, 52px); }
.cs-hero h1 { font-size: clamp(2.3rem, 5.4vw, 3.5rem); letter-spacing: -0.02em; }
.cs-hero .subtitle { font: 500 clamp(1.08rem, 2.2vw, 1.32rem) / 1.35 var(--font-display); margin-top: 10px; }
.cs-hero .lead { font-size: 1rem; max-width: 62ch; }
.cs-hero .tags { margin-top: 22px; padding-top: 0; }
.glance { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; min-width: 0; }
.stat-value { display: block; font: 600 2rem / 1.1 var(--font-display); overflow-wrap: anywhere; }
.stat-label { display: block; color: var(--muted); font-size: 0.88rem; margin-top: 6px; }
.cs-facts { grid-column: 1 / -1; display: grid; grid-template-columns: auto 1fr; gap: 2px 16px; align-items: baseline; margin: 6px 0 0; padding: 0 4px; font-size: 0.92rem; }
.cs-facts dt { font: 500 0.74rem / 1.5 var(--font-mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; padding-block: 3px; }
.cs-facts dd { margin: 0; line-height: 1.5; padding-block: 3px; }

/* Sections 01, 04, 05, 06 */
.two { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 32px; }
.two.one { grid-template-columns: minmax(0, 1fr); }
.prose { display: grid; gap: 14px; align-content: start; max-width: 66ch; color: var(--muted); }
.aside { display: grid; gap: 12px; align-content: start; }
.note { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.note h3 { font-size: 1rem; margin-bottom: 6px; }
.note p { color: var(--muted); font-size: 0.92rem; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.cards[data-count="1"] { grid-template-columns: minmax(0, 1fr); }
.cards[data-count="3"] { grid-template-columns: repeat(3, minmax(0, 1fr)); }
/* an odd last card fills its row in a two-column grid */
.cards[data-count="5"] > :last-child { grid-column: 1 / -1; }
.cards.notes { margin-top: 16px; }
.decision { padding: 18px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.decision h3 { font-size: 1.02rem; margin-bottom: 8px; }
.decision p { color: var(--muted); font-size: 0.92rem; }
.role { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; max-width: 72ch; }
.role li { display: grid; grid-template-columns: 18px 1fr; gap: 8px; color: var(--muted); }
.role li::before { content: ""; width: 8px; height: 8px; margin-top: 0.6em; border-radius: 2px; background: var(--accent); }
.result { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; padding: 24px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.result p { max-width: 64ch; color: var(--muted); }
.asof { margin-top: 14px; font: 500 0.78rem var(--font-mono); color: var(--muted); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding-top: 28px; }
.pager a { display: grid; gap: 4px; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); font-family: var(--font-display); font-weight: 600; overflow-wrap: anywhere; }
.pager a:hover { text-decoration: none; border-color: var(--accent); }
.pager small { font: 500 0.74rem var(--font-mono); color: var(--muted); }
.pager .next { text-align: right; }

/* Panels, toolbar and the step list */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.toolbar { display: none; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 12px 16px; border-bottom: 1px solid var(--border); font: 500 0.8rem var(--font-mono); color: var(--muted); }
.is-ready .toolbar { display: flex; }
.toolbar .caption { min-height: 1.6em; }
.playbtn { display: inline-flex; align-items: center; gap: 6px; font: 600 0.78rem var(--font-mono); color: var(--text); background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 6px 10px; cursor: pointer; }
.playbtn:hover { border-color: var(--accent); }
.playbtn[hidden] { display: none; }
.playbtn svg { width: 14px; height: 14px; }
.diagram { padding: 8px 12px 0; }
.steps { list-style: none; margin: 0; padding: 16px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.steps[data-count="1"] { grid-template-columns: minmax(0, 1fr); }
.steps[data-count="2"], .steps[data-count="4"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.steps li { display: flex; min-width: 0; }
.step { display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; align-content: start; width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 10px; color: var(--muted); text-align: left; font: inherit; background: none; }
button.step { cursor: pointer; }
button.step:hover { border-color: var(--accent); }
button.step:focus-visible { outline-offset: 2px; border-radius: 10px; }
.step .num { grid-row: span 2; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font: 600 0.78rem var(--font-mono); border: 1px solid var(--border); }
.step b { font: 600 0.95rem var(--font-display); color: var(--text); overflow-wrap: anywhere; }
.step .t { font-size: 0.86rem; line-height: 1.45; overflow-wrap: anywhere; }
.step[aria-current="step"] { border-color: var(--accent); background: var(--accent-soft); }
.step[aria-current="step"] .num { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.chip { display: inline-block; margin-left: 6px; padding: 0 7px; border: 1px solid var(--accent); border-radius: 999px; color: var(--text); font: 600 0.62rem / 1.7 var(--font-mono); letter-spacing: 0.08em; vertical-align: 0.12em; white-space: nowrap; }

/* Architecture diagram. Both layouts are in the page; CSS shows one. Without JavaScript nothing is dimmed. */
.flow, .er { display: block; width: 100%; height: auto; }
.flow text, .er text { font-family: var(--font-text); }
.flow-tall { display: none; }
.flow .node, .flow .edge { transition: opacity 0.35s; }
.flow .node rect { fill: var(--surface-2); stroke: var(--border); stroke-width: 1.2; transition: stroke 0.35s; }
.flow .node.on rect { stroke: var(--accent); stroke-width: 1.8; }
.flow .node.off { opacity: 0.55; }
.flow .tag { font: 500 10px var(--font-mono); letter-spacing: 0.08em; fill: var(--muted); }
.flow .ttl { font: 600 16px var(--font-display); fill: var(--text); }
.flow .sub { font-size: 11.5px; fill: var(--muted); }
.flow .line { fill: none; stroke: var(--muted); stroke-width: 1.6; transition: stroke 0.35s; }
.flow .head { fill: var(--muted); transition: fill 0.35s; }
.flow .edge.on .line { stroke: var(--accent); stroke-width: 2; }
.flow .edge.on .head { fill: var(--accent); }
.flow .edge.off { opacity: 0.4; }
.flow .dot { fill: var(--accent); }
.flow .halo { fill: var(--accent); opacity: 0.22; }
.flow .pill { display: none; }
.flow .pill.on { display: inline; }
.flow .pill rect { fill: var(--bg); stroke: var(--accent); }
.flow .pill text { font: 600 10px var(--font-mono); letter-spacing: 0.1em; fill: var(--accent); }

/* Data model: SVG on wide screens, entity cards on phones (the cards stay available to screen readers on wide screens) */
.er .box { fill: var(--surface-2); stroke: var(--border); stroke-width: 1.2; }
.er .lib .box { stroke: var(--muted); stroke-dasharray: 5 4; }
.er .sep { stroke: var(--border); }
.er .ename { font: 600 14px var(--font-display); fill: var(--text); }
.er .ealt { font: 400 10.5px var(--font-mono); fill: var(--muted); }
.er .field { font-size: 12px; fill: var(--text); }
.er .keybox { fill: var(--accent); }
.er .key { font: 600 9.5px var(--font-mono); letter-spacing: 0.04em; fill: var(--accent-fg); }
.er .rel { fill: none; stroke: var(--muted); stroke-width: 1.3; }
.er-cards ul { list-style: none; margin: 0; padding: 0; }
.er-cards > ul { display: grid; gap: 10px; }
.er-card { border: 1px solid var(--border); border-radius: 10px; background: var(--surface-2); padding: 12px 14px; }
.er-card.lib { border-style: dashed; border-color: var(--muted); }
.er-card h3 { font-size: 1rem; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; }
.er-card .kind { font: 500 0.7rem var(--font-mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.er-card .alt { font: 400 0.74rem var(--font-mono); color: var(--muted); margin-top: 2px; }
.er-card .fields { display: grid; gap: 4px; margin-top: 10px; font-size: 0.92rem; }
.er-card .fields li { display: flex; align-items: center; gap: 10px; }
.er-card .key { flex: none; display: inline-grid; place-items: center; width: 26px; height: 16px; border-radius: 4px; background: var(--accent); color: var(--accent-fg); font: 600 0.62rem var(--font-mono); letter-spacing: 0.04em; text-decoration: none; }
.er-card .key.none { background: none; }
.er-card .rels { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border); display: grid; gap: 2px; color: var(--muted); font-size: 0.86rem; }
.cap { padding: 12px 16px 16px; color: var(--muted); font-size: 0.88rem; border-top: 1px solid var(--border); }
.cap .legend { display: block; margin-top: 4px; font: 0.74rem var(--font-mono); }

/* Footer and the list page */
.cs-footer { padding-inline: var(--gutter); margin-top: 48px; }
.cs-notice { flex-basis: 100%; max-width: 84ch; font-family: var(--font-text); }
.cs-list-head { padding-block: clamp(36px, 6vw, 56px) 24px; }
.cs-list-head h1 { font-size: clamp(2.3rem, 5.4vw, 3.5rem); letter-spacing: -0.02em; }
.cs-list { list-style: none; margin: 0; padding: 0 0 16px; display: grid; gap: 14px; }
.cs-list li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 16px; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.cs-list .num { font: 600 1.1rem var(--font-mono); color: var(--accent); }
.cs-list h2 { font-size: 1.25rem; }
.cs-list h2 a { color: var(--text); }
.cs-list h2 a:hover { color: var(--accent); }
.cs-list p { color: var(--muted); margin-top: 6px; }
.cs-list .tags { margin-top: 12px; padding-top: 0; }
.cs-list .langs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.cs-list .langs a { display: inline-flex; font-size: 0.9rem; font-weight: 500; padding: 7px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface-2); color: var(--text); }
.cs-list .langs a:hover { border-color: var(--accent); text-decoration: none; }

@media (max-width: 900px) {
  .cs-hero, .two { grid-template-columns: 1fr; }
  .steps[data-count], .steps, .cards[data-count], .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cards[data-count] > :last-child:nth-child(odd) { grid-column: 1 / -1; }
}
@media (min-width: 1000px) {
  .er-cards { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0; }
}
@media (max-width: 999.98px) {
  .flow-wide, .er { display: none; }
  .flow-tall { display: block; max-width: 460px; margin-inline: auto; }
  .er-cards { padding: 16px; }
}
@media (max-width: 620px) {
  .steps[data-count], .steps, .cards[data-count], .cards, .pager { grid-template-columns: 1fr; }
  .cs .brand-name, .crumb li:last-child { display: none; }
  .pager .next { text-align: left; }
  .result { padding: 18px; }
  .cs-list li { grid-template-columns: 1fr; gap: 6px; }
}
@media (max-width: 420px) {
  .stat { padding: 14px; }
  .stat-value { font-size: 1.6rem; }
}
@media (prefers-reduced-motion: reduce) {
  .cs *, .cs *::before, .cs *::after { transition: none !important; }
}
@media print {
  .toolbar, .lang, .playbtn { display: none !important; }
  .flow .off { opacity: 1 !important; }
  .flow-tall { display: none !important; }
  .flow-wide, .er { display: block !important; }
  .er-cards { display: none !important; }
  .panel, .note, .decision, .stat, .result { break-inside: avoid; }
}