/* Drawing conventions, Sheet 00. docs/02-conventions.md is authoritative. */
:root {
  --ground: #F9FAFB;
  --grid: #E5E7EB;
  --grid-major: #D5D8DE;
  --rule: #C9CDD4;
  --line: #9AA0AA;
  --muted: #6B7280;
  --faint: #9CA3AF;
  --ink: #111827;
  --body: #374151;
  --red: #FF2D20;
  --red-text: #C8220F;
  --red-tint: #FFF1F0;
  --blue: #2A5BE0;
  --blue-text: #1E46B8;
  --blue-tint: #E4EBFB;
  --face-top: #FFFFFF;
  --face-left: #E3E6EA;
  --face-right: #EEF0F3;
  --face-inset: #DADDE2;
  --sans: Figtree, 'Segoe UI', Helvetica, Arial, sans-serif;
  --mono: 'JetBrains Mono', Menlo, monospace;
}

html, body { margin: 0; background: var(--ground); }
body { font-family: var(--sans); color: var(--ink); -webkit-font-smoothing: antialiased; }

/* The sheet is drawn at 1600 by 1100 and scaled to fit the viewport width. */
.sheet-viewport { width: 100%; overflow: clip; }
.sheet { position: relative; overflow: hidden; background: var(--ground); transform-origin: top left; }
.sheet > svg { position: absolute; left: 0; top: 0; width: 100%; height: 100%; }
.sheet .abs { position: absolute; }

.mono { font-family: var(--mono); }
.running-head { font-family: var(--mono); font-size: 11px; color: var(--muted); top: 64px; }
.running-head.left { left: 64px; }
.running-head.right { right: 64px; text-align: right; }

.headline-name { left: 64px; top: 100px; font-size: 64px; font-weight: 600; line-height: 68px; letter-spacing: -2px; color: var(--ink); }
.headline-line { left: 64px; top: 174px; font-family: var(--mono); font-size: 13px; color: var(--muted); }
.headline-summary { left: 820px; top: 110px; width: 716px; font-size: 20px; line-height: 28px; color: var(--body); }

.section-title { font-family: var(--mono); font-size: 11px; font-weight: 500; color: var(--ink); letter-spacing: 1px; text-transform: uppercase; }

.kv { display: flex; flex-direction: column; font-size: 14px; line-height: 19px; color: var(--ink); }
.kv > div { display: flex; gap: 12px; padding: 6px 0; border-top: 0.75px solid var(--rule); }
.kv > div:last-child { border-bottom: 0.75px solid var(--rule); }
.kv .k { width: 128px; flex: none; font-family: var(--mono); font-size: 11px; color: var(--muted); padding-top: 3px; }
.kv .v.mono { font-size: 12px; }
.kv .n { width: 18px; flex: none; font-family: var(--mono); font-size: 11px; color: var(--muted); padding-top: 3px; }
.kv .name { font-weight: 500; }
.kv .v .mono { font-size: 12px; }

.home-cloud { color: var(--blue-text); }

.prose { font-size: 14px; line-height: 20px; color: var(--body); }
.marks { font-family: var(--mono); font-size: 12px; line-height: 19px; color: var(--body); }
.note { font-size: 12px; line-height: 18px; color: var(--faint); }

.title-block .label { font-family: var(--mono); font-size: 9px; color: var(--muted); }
.title-block .value { font-family: var(--mono); font-size: 11px; color: var(--ink); white-space: nowrap; overflow: hidden; }
.title-block .value.small { font-size: 9px; padding-top: 2px; }
.status-draft-unverified { color: var(--red-text); }
.status-verified { color: var(--ink); }
.status-signalled { color: var(--muted); }
.status-extrapolation { color: var(--faint); }

/* Index */
.index { max-width: 720px; margin: 64px auto; padding: 0 24px; }
.index h1 { font-size: 32px; font-weight: 600; letter-spacing: -1px; margin: 0 0 8px; }
.index p { color: var(--body); font-size: 16px; line-height: 1.5; }
.index ul { list-style: none; padding: 0; margin: 32px 0; border-top: 0.75px solid var(--rule); }
.index li { display: flex; gap: 16px; padding: 12px 0; border-bottom: 0.75px solid var(--rule); font-size: 16px; }
.index li .num { font-family: var(--mono); font-size: 12px; color: var(--muted); width: 72px; flex: none; padding-top: 3px; }
.index a { color: var(--ink); text-decoration: none; }
.index a:hover { color: var(--blue-text); }
.index .status { margin-left: auto; font-family: var(--mono); font-size: 11px; }

/* Cover plate */
.cover-kicker { left: 64px; top: 250px; font-size: 22px; font-weight: 400; line-height: 28px; color: var(--muted); }
.cover-name { left: 60px; top: 284px; font-size: 128px; font-weight: 600; line-height: 120px; letter-spacing: -5px; color: var(--red); }
.cover-blurb { left: 64px; top: 440px; width: 560px; font-size: 18px; line-height: 27px; color: var(--body); }
.cover-volumes { left: 64px; top: 560px; width: 560px; }
.cover-volumes > div { padding: 8px 0; gap: 14px; }
.cover-volumes .k { width: 36px; }
.cover-volumes a { color: var(--ink); text-decoration: none; }
.cover-volumes a:hover { color: var(--blue-text); }

/* Entry columns flow top to bottom with a gap, so a long section pushes the next down rather than over it. */
.column { display: flex; flex-direction: column; gap: 14px; overflow: hidden; }
.column > section { display: flex; flex-direction: column; gap: 8px; }
.column .kv { margin-top: 2px; }
.column .note { margin-top: 2px; }
.index .undrawn { color: var(--muted); }
.index .running-head a { color: inherit; text-decoration: none; }
.status-undrawn { color: var(--faint); }

/* Plate II.0, the tech tree */
.tree-title { font-size: 54px; font-weight: 600; line-height: 60px; letter-spacing: -1.5px; color: var(--ink); }
.tree-title .red { color: var(--red); }
.tree-sub { font-size: 18px; line-height: 26px; color: #4B5563; }
.tree-play { height: 44px; padding: 0 18px; border: 1.5px solid var(--red); border-radius: 8px; background: #FFFFFF; color: var(--red-text); font-family: var(--sans); font-size: 15px; font-weight: 600; cursor: pointer; }
.tree-play:hover { background: var(--red-tint); }
.tree-legend { display: flex; gap: 28px; font-family: var(--mono); font-size: 11px; line-height: 16px; color: var(--muted); }
.tree-legend span { display: inline-flex; align-items: center; gap: 8px; }
.tree-legend a { color: var(--blue-text); text-decoration: none; }
.tree a { cursor: pointer; }
.tree a:hover rect:first-child { stroke-width: 2.5; }
/* The independent translate property, not transform: an SVG group's own transform attribute places the card, and a CSS transform would override it. */
@keyframes rise { from { opacity: 0; translate: -18px 0; } to { opacity: 1; translate: 0 0; } }
.tree.play .b { animation: rise .7s cubic-bezier(.2,.7,.2,1) both; }
.headline-summary .mono { font-size: 17px; }
.prose .mono { font-size: 12.5px; }

/* The guide's way around: a thin bar above the drawing, outside the sheet itself. */
.guide-nav { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 24px; height: 44px; padding: 0 20px; background: rgba(249,250,251,.96); border-bottom: 0.75px solid var(--rule); font-family: var(--mono); font-size: 11px; color: var(--muted); backdrop-filter: blur(6px); }
.guide-nav a { color: var(--muted); text-decoration: none; }
.guide-nav a:hover { color: var(--blue-text); }
.guide-nav .gn-home { color: var(--red-text); letter-spacing: .5px; text-transform: uppercase; }
.guide-nav .gn-links { display: flex; gap: 18px; }
.guide-nav .gn-links a.on { color: var(--ink); border-bottom: 1.5px solid var(--red); padding-bottom: 2px; }
.guide-nav .gn-step { margin-left: auto; display: flex; gap: 16px; align-items: center; }
.guide-nav .gn-step a { color: var(--ink); }
.guide-nav .gn-here { color: var(--faint); }
@media (max-width: 760px) { .guide-nav .gn-home { display: none; } .guide-nav { gap: 12px; } }
@media print { .guide-nav { display: none; } }

/* Catalogue pages (Stories, Volume II): the sheet register at page scale. */
body.ground { background-color: var(--ground); background-image: linear-gradient(#E5E7EB 0.75px, transparent 0.75px), linear-gradient(90deg, #E5E7EB 0.75px, transparent 0.75px); background-size: 20px 20px; }
.catalogue { max-width: 1240px; margin: 0 auto; padding: 48px 32px 80px; }
.cat-head { border: 1px solid var(--line); outline: 0.75px solid var(--rule); outline-offset: 6px; background: rgba(249,250,251,.92); padding: 32px 36px 28px; margin: 8px 0 48px; }
.cat-run { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.cat-head h1 { margin: 18px 0 0; font-size: 64px; line-height: 68px; letter-spacing: -2px; font-weight: 600; }
.cat-lede { max-width: 760px; margin: 14px 0 0; font-size: 18px; line-height: 27px; color: var(--body); }
.cat-stats { display: flex; flex-wrap: wrap; gap: 0; margin: 26px 0 0; border-top: 1px solid var(--ink); }
.cat-stats div { padding: 10px 28px 0 0; }
.cat-stats dt { font-family: var(--mono); font-size: 9px; color: var(--muted); letter-spacing: .5px; text-transform: uppercase; }
.cat-stats dd { margin: 4px 0 0; font-family: var(--mono); font-size: 12px; color: var(--ink); }
.cat-group { margin: 0 0 56px; }
.cat-group-head { display: grid; grid-template-columns: 44px auto 1fr; gap: 16px; align-items: baseline; border-bottom: 1px solid var(--ink); padding-bottom: 10px; margin-bottom: 22px; }
.cat-group-n { font-family: var(--mono); font-size: 11px; color: var(--red-text); }
.cat-group-head h2 { margin: 0; font-size: 28px; letter-spacing: -1px; font-weight: 600; }
.cat-group-head p { margin: 0; font-size: 15px; color: var(--muted); }
.story-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.story-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.story-grid-2 .story-card { grid-column: span 1; }
.story-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.story-grid-1 { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }
.story-card { display: flex; flex-direction: column; background: #FFFFFF; border: 1px solid var(--rule); padding: 14px 14px 16px; transition: border-color .15s, transform .15s; }
.story-card:hover { border-color: var(--ink); transform: translateY(-2px); }
.story-art { display: block; background: var(--ground); background-image: linear-gradient(#E5E7EB 0.75px, transparent 0.75px), linear-gradient(90deg, #E5E7EB 0.75px, transparent 0.75px); background-size: 20px 20px; border: 0.75px solid var(--rule); }
.story-art svg { display: block; width: 100%; height: auto; aspect-ratio: 360 / 220; }
.story-grid-1 .story-art svg, .story-grid-2 .story-art svg { aspect-ratio: 360 / 180; }
.story-meta { display: flex; justify-content: space-between; margin: 12px 0 0; font-family: var(--mono); font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.story-meta span:first-child { color: var(--red-text); }
.story-card h3 { margin: 8px 0 0; font-size: 22px; line-height: 26px; letter-spacing: -.5px; font-weight: 600; }
.story-card h3 a { color: var(--ink); text-decoration: none; }
.story-card p { margin: 8px 0 0; font-size: 14px; line-height: 21px; color: var(--body); flex: 1; }
.story-links { display: flex; gap: 18px; margin-top: 14px; padding-top: 10px; border-top: 0.75px solid var(--rule); font-family: var(--mono); font-size: 11px; }
.story-links a { color: var(--blue-text); text-decoration: none; }
.story-links a:hover { text-decoration: underline; }
.cat-foot { margin-top: 24px; padding-top: 12px; border-top: 0.75px solid var(--rule); font-family: var(--mono); font-size: 11px; color: var(--muted); }
@media (max-width: 1000px) { .story-grid, .story-grid-4, .story-grid-1 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .story-grid, .story-grid-4, .story-grid-2, .story-grid-1 { grid-template-columns: 1fr; } .cat-head h1 { font-size: 44px; line-height: 48px; } .cat-stats { grid-template-columns: 1fr 1fr; } .catalogue { padding: 24px 16px 60px; } }

.present-card { background: #FFFFFF; border: 1px dashed var(--line); padding: 18px; align-self: start; }
.present-card h3 { margin: 8px 0 12px; font-size: 20px; letter-spacing: -.5px; font-weight: 600; }
.present-card dl { margin: 0; border-top: 0.75px solid var(--rule); }
.present-card dl div { display: grid; grid-template-columns: 90px 1fr; gap: 10px; padding: 8px 0; border-bottom: 0.75px solid var(--rule); font-size: 13px; line-height: 18px; color: var(--body); }
.present-card dt { font-family: var(--mono); font-size: 11px; color: var(--ink); }
.present-card dd { margin: 0; }
.present-card code { font-family: var(--mono); font-size: 11px; }

/* Volume II: the ecosystem catalogue */
.eco-legend { background: #FFFFFF; border: 1px solid var(--rule); padding: 14px 18px; margin: -24px 0 40px; display: grid; gap: 10px; }
.eco-legend-row { display: grid; grid-template-columns: 70px 1fr; gap: 12px; align-items: start; }
.eco-legend-title { font-family: var(--mono); font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; padding-top: 6px; }
.eco-lanes { display: flex; flex-wrap: wrap; gap: 6px; }
.eco-lane { display: inline-flex; align-items: center; gap: 7px; padding: 5px 10px; border: 1px solid var(--rule); background: var(--ground); font-family: var(--mono); font-size: 11px; color: var(--ink); cursor: pointer; }
.eco-lane .sw { width: 10px; height: 10px; background: var(--lane); }
.eco-lane .n { color: var(--faint); }
.eco-lane:hover { border-color: var(--lane); }
.eco-lane[aria-pressed="true"] { border-color: var(--lane); box-shadow: inset 0 -2px 0 var(--lane); background: #FFFFFF; }
.eco-marks { display: flex; flex-wrap: wrap; gap: 18px; font-family: var(--mono); font-size: 11px; color: var(--body); align-items: center; padding-top: 4px; }
.eco-marks span { display: inline-flex; align-items: center; gap: 7px; }
.mk { display: inline-block; width: 22px; height: 14px; background: #FFFFFF; border: 1px solid var(--line); }
.mk-prod { border-width: 1px 1px 3px; border-color: var(--ink); }
.mk-cloud { border-color: var(--blue); background: var(--blue-tint); }
.mk-line { width: 26px; height: 0; border: 0; border-top: 1.5px solid var(--line); background: none; position: relative; }
.eco-hint { color: var(--faint); }
.eco-age { margin: 0 0 44px; }
.eco-age-head { display: grid; grid-template-columns: auto auto 1fr auto; gap: 16px; align-items: center; border-bottom: 1px solid var(--ink); padding-bottom: 10px; margin-bottom: 18px; }
.eco-pennant { position: relative; display: inline-flex; align-items: baseline; gap: 10px; padding: 8px 14px; background: #FFFFFF; border: 1.5px solid var(--line); border-right: 0; font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--body); margin-right: 14px; }
.eco-pennant::after { content: ""; position: absolute; top: -1.5px; right: -14px; width: 14px; height: calc(100% + 3px); background: inherit; clip-path: polygon(0 0, 100% 50%, 0 100%); }
.eco-pennant::before { content: ""; position: absolute; top: -1.5px; right: -15.5px; width: 15.5px; height: calc(100% + 3px); background: var(--line); clip-path: polygon(0 0, 100% 50%, 0 100%, 0 calc(100% - 2px), calc(100% - 2.6px) 50%, 0 2px); }
.eco-pennant.platform::before { background: var(--blue); }
.eco-pennant b { font-family: var(--sans); font-size: 20px; font-weight: 600; color: var(--ink); }
.eco-pennant.platform { background: #F0F4FD; border-color: var(--blue); color: var(--blue-text); }
.eco-pennant.platform b { color: var(--blue-text); }
.eco-age-years { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.eco-age-motto { font-size: 15px; color: var(--muted); font-style: italic; }
.eco-age-vs { display: flex; gap: 4px; }
.eco-age-vs i { font-style: normal; font-family: var(--mono); font-size: 10px; font-weight: 500; color: #FFFFFF; background: var(--red); border-radius: 9px; padding: 2px 8px; }
.eco-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.eco-card { position: relative; display: flex; flex-direction: column; gap: 6px; padding: 12px 14px 12px 18px; background: #FFFFFF; border: 1px solid var(--rule); text-decoration: none; color: var(--ink); transition: opacity .15s, border-color .15s, box-shadow .15s; }
.eco-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--lane); }
.eco-card.kind-product { border-bottom: 3px solid var(--ink); }
.eco-card.cloud { background: #F6F8FE; border-color: #BFD0F3; }
.eco-card:hover, .eco-card:focus { border-color: var(--ink); outline: none; }
.eco-top { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 10px; color: var(--muted); }
.eco-no { color: var(--red-text); }
.eco-name { display: flex; align-items: center; gap: 8px; font-size: 19px; font-weight: 600; letter-spacing: -.4px; }
.eco-what { font-size: 13px; line-height: 19px; color: var(--body); }
.eco-line { display: flex; flex-direction: column; gap: 2px; margin-top: auto; padding-top: 8px; border-top: 0.75px solid var(--rule); font-family: var(--mono); font-size: 10px; line-height: 15px; color: var(--muted); }
.eco-kind { color: var(--ink); }
body.tracing .eco-card { opacity: .28; }
body.tracing .eco-card.t-self, body.tracing .eco-card.t-up, body.tracing .eco-card.t-down { opacity: 1; }
.eco-card.t-self { box-shadow: 0 0 0 2px var(--ink); }
.eco-card.t-up { box-shadow: 0 0 0 2px var(--lane); }
.eco-card.t-up::after, .eco-card.t-down::after { position: absolute; left: 14px; top: -8px; padding: 0 5px; background: #FFFFFF; font-family: var(--mono); font-size: 9px; line-height: 14px; letter-spacing: .5px; text-transform: uppercase; }
.eco-card.t-up::after { content: "grew from"; color: var(--muted); }
.eco-card.t-down { box-shadow: 0 0 0 2px var(--lane); }
.eco-card.t-down::after { content: "grew into"; color: var(--muted); }
@media (max-width: 760px) { .eco-age-head { grid-template-columns: 1fr; gap: 6px; } .eco-legend-row { grid-template-columns: 1fr; } }

.neighbour-links { display: flex; flex-wrap: wrap; gap: 6px; }
.neighbour-links a { font-family: var(--mono); font-size: 11px; color: var(--blue-text); text-decoration: none; border: 0.75px solid var(--rule); padding: 2px 7px; background: #FFFFFF; }
.neighbour-links a b { font-weight: 400; color: var(--muted); margin-left: 4px; }
.neighbour-links a:hover { border-color: var(--blue); }

/* Fuller sheets: the columns' prose a touch tighter, the first-recorded line wraps inside the headline block. */
.column .prose { font-size: 13px; line-height: 18px; }
.column { gap: 9px; }
.column > section { gap: 6px; }
.headline-line { width: 720px; line-height: 18px; }
.neighbour-links { margin-top: 2px; }