.system-figure{margin:28px 0}.system-grid{display:grid;grid-template-columns:1fr 1.45fr 1fr;align-items:stretch;gap:20px}.system-end{border:1px solid var(--line);border-top:3px solid var(--accent);padding:24px;border-radius:6px}.system-end h3{margin:10px 0 16px}.system-end p{color:var(--ink-soft);font-size:15px}.system-end strong{font-size:14px}.diagram-label{font-size:12px;color:var(--accent);letter-spacing:.1em;font-weight:700}.system-paths{display:grid;gap:12px;align-content:center}.route-path{text-align:center;border-block:1px solid var(--line);padding:16px 8px}.route-path b,.route-path span,.route-path small{display:block}.route-path span{font-size:14px;color:var(--ink-soft)}.route-path small{font-size:12px;color:var(--ink-soft)}.push-path{background:var(--accent-soft);border:0;border-radius:6px}.push-path b{font-size:13px}figcaption,.diagram-note{font-size:14px;color:var(--ink-soft);margin-top:20px;max-width:75ch}.routing-start{max-width:340px;text-align:center;margin:24px auto;background:var(--accent-soft);padding:16px;border-radius:6px}.routing-branches{display:grid;grid-template-columns:1fr 1.5fr 1fr;border-top:2px solid var(--line);gap:24px}.routing-branches>div{text-align:center;position:relative}.routing-branches>div:before{content:'↓';display:block;color:var(--accent);font-size:24px}.routing-branches h3{margin:8px 0 16px}.route-result,.route-check{padding:16px;background:var(--accent-soft);border-radius:6px;font-size:14px}.local-result{background:var(--code-bg)}.routing-branches p{font-size:13px;color:var(--ink-soft);margin-top:8px}.route-split{display:flex;gap:12px;margin:12px 0}.route-split span{flex:1;background:var(--code-bg);padding:12px;font-size:14px}.route-split b{display:block}.lifecycle{display:grid;grid-template-columns:repeat(5,1fr);list-style:none;padding:0;gap:16px;margin:28px 0}.lifecycle li{border-top:3px solid var(--accent);padding-top:12px}.lifecycle li:not(:last-child) b:after{content:' →';color:var(--accent)}.lifecycle b,.lifecycle span{display:block}.lifecycle span{font-size:14px;color:var(--ink-soft);margin-top:8px}.lifecycle-exceptions{display:grid;grid-template-columns:1fr 1fr;gap:32px;border-block:1px solid var(--line);padding:20px 0}.lifecycle-exceptions h3{margin:0 0 12px}.lifecycle-exceptions p{margin:0;font-size:15px}.time-example{display:flex;gap:24px;flex-wrap:wrap;margin:24px 0}.time-example span{font-size:13px;color:var(--ink-soft)}.time-example b{display:block;color:var(--ink);font-size:17px}.policy-table{overflow:auto}.spec-section{scroll-margin-top:24px;border-top:1px solid var(--line)}.spec-section>summary{padding:20px 0;cursor:pointer;list-style:none}.spec-section>summary:before{content:'+';color:var(--accent);margin-right:12px}.spec-section[open]>summary:before{content:'−'}.spec-section summary strong{font-size:18px}.spec-section summary small{display:block;color:var(--ink-soft);font-size:14px;font-weight:400;margin:6px 0 0 25px}.spec-body{padding:0 0 24px 25px}.spec-controls{display:flex;gap:12px;margin:24px 0}.spec-controls button{font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:10px 16px;min-height:44px;cursor:pointer}@media(max-width:680px){.system-grid,.routing-branches,.lifecycle,.lifecycle-exceptions{grid-template-columns:1fr}.system-paths{padding:4px 0}.routing-branches{border-top:0;gap:12px}.routing-branches>div{border-top:1px solid var(--line)}.lifecycle li:not(:last-child) b:after{content:' ↓'}.spec-body{padding-left:0}.spec-section summary strong{font-size:17px}}@media print{.spec-section>.spec-body{display:block!important}.spec-controls{display:none}}

.spec-section>summary{text-transform:none}

/* Full specification: readable topic hierarchy and diagrams at the relevant flow. */
.plan{max-width:none}.spec-section{margin-top:24px}.spec-section>summary{border-top:3px solid var(--accent);padding:22px 0}.spec-section>summary strong{font:700 clamp(1.7rem,3vw,2.25rem)/1.25 Charter,Georgia,serif}.spec-section>summary small{font-size:16px;max-width:65ch;margin-top:10px}.spec-body{padding:0 0 48px 0}.spec-body>p,.spec-body>ul,.spec-body>ol{max-width:66ch;line-height:1.75}.spec-body>p{margin:0 0 18px}.spec-body>table{max-width:100%;display:block;overflow-x:auto}.spec-body li{margin:8px 0}.spec-topic{scroll-margin-top:24px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;letter-spacing:0}.spec-body h3{font-size:22px;line-height:1.4;margin:48px 0 18px;padding-top:16px;border-top:1px solid var(--line)}.spec-body h4{font-size:17px;line-height:1.4;margin:28px 0 12px;color:var(--ink-soft)}.topic-nav{min-height:0;display:flex;justify-content:flex-start;align-items:baseline;gap:8px 18px;flex-wrap:wrap;max-width:100%;border-bottom:1px solid var(--line);padding:12px 0 22px;margin:0 0 24px}.topic-nav a{font-size:13px;text-decoration:underline;color:var(--accent)}.spec-body h3.topic-gate,.spec-body h4.topic-gate{border:0;border-left:4px solid var(--warn);background:var(--warn-bg);padding:12px 16px;color:var(--warn);max-width:66ch}.spec-body .topic-tests{color:var(--ok)}.technical-figure{margin:24px 0 28px;max-width:100%;border:1px solid var(--line);border-radius:6px;overflow:hidden}.figure-toolbar{display:flex;justify-content:space-between;gap:12px;padding:14px 18px;border-bottom:1px solid var(--line);background:var(--code-bg);align-items:baseline}.figure-toolbar strong{font-size:14px}.figure-toolbar a{font-size:12px;white-space:nowrap}.figure-scroll{overflow-x:auto;overscroll-behavior-x:contain}.figure-scroll img{display:block;width:100%;min-width:760px;height:auto;max-width:none}.technical-figure figcaption{margin:0;padding:16px 18px;font-size:14px;max-width:80ch;line-height:1.6}.spec-body:has(.technical-figure){max-width:none}@media(max-width:680px){.spec-section>summary strong{font-size:26px}.spec-section>summary small{margin-left:0;font-size:14px}.spec-body h3{font-size:20px;margin-top:36px}.spec-body>p{font-size:16px}.figure-toolbar{align-items:flex-start;flex-direction:column;gap:4px}.topic-nav{gap:10px 18px}.topic-nav a{font-size:14px;min-height:28px}.technical-figure figcaption:after{content:' Swipe the diagram horizontally, or open it full size.';display:block;margin-top:8px;color:var(--accent)}}@media print{.figure-scroll img{min-width:0}.topic-nav,.figure-toolbar a{display:none}.technical-figure{break-inside:avoid}.spec-body{max-width:none}}

.technical-figure img{width:auto;max-width:100%;min-width:700px;margin-inline:auto}
@media print{.technical-figure img{min-width:0}}

@media (max-width: 900px) {
  .system-grid, .routing-branches, .lifecycle, .lifecycle-exceptions { grid-template-columns: 1fr; }
  .lifecycle li:not(:last-child) b:after { content: ' ↓'; }
}