/* Reckoning: an interactive handbook. One reading column, wide "plates" for instruments and tables.
   Signal-flag colours are a coding system (red = then-and-now / attention, blue = exact, yellow = focus), not decoration. */
:root {
  --paper: #f2f4f3; --sheet: #ffffff; --ink: #14212b; --muted: #56646d; --rule: #cfd6d8; --tint: #e7ecec;
  --signal: #c8261d; --flag-y: #e8b500; --flag-b: #1d4f91; --ok: #2f7d4f;
  --display: "Barlow Condensed", "Arial Narrow", system-ui, sans-serif;
  --body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --wrap: 1080px;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --paper: #0f171d; --sheet: #16222a; --ink: #e4eaec; --muted: #9aa9b1; --rule: #2c3a43; --tint: #1d2b34;
  --signal: #ff6a5c; --flag-y: #f2c53d; --flag-b: #7aa7e6; --ok: #6cc790; color-scheme: dark; } }
:root[data-theme="dark"] {
  --paper: #0f171d; --sheet: #16222a; --ink: #e4eaec; --muted: #9aa9b1; --rule: #2c3a43; --tint: #1d2b34;
  --signal: #ff6a5c; --flag-y: #f2c53d; --flag-b: #7aa7e6; --ok: #6cc790; color-scheme: dark; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--body);
  padding: env(safe-area-inset-top, 0px) env(safe-area-inset-right, 0px) env(safe-area-inset-bottom, 0px) env(safe-area-inset-left, 0px); }
a { color: var(--flag-b); text-underline-offset: 2px; }
a:hover { color: var(--signal); }
:focus-visible { outline: 3px solid var(--flag-y); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--display); font-weight: 600; line-height: 1.05; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(40px, 8vw, 76px); text-transform: uppercase; letter-spacing: .01em; }
h2 { font-size: clamp(26px, 4vw, 36px); text-transform: uppercase; letter-spacing: .02em; }
h3 { font-size: 21px; letter-spacing: .02em; }
p { margin: 0; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: 16px; }
.col { max-width: 68ch; }
.eyebrow { font: 500 12px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.small { font-size: 14px; color: var(--muted); }
.mono, td.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.stack { display: grid; gap: 16px; }

/* top bar */
.bar { border-bottom: 2px solid var(--ink); background: var(--paper); position: sticky; top: 0; z-index: 10; }
.bar .wrap { display: flex; gap: 14px; align-items: center; min-height: 52px; flex-wrap: wrap; }
.mark { font: 700 22px/1 var(--display); letter-spacing: .08em; text-transform: uppercase; color: var(--ink); text-decoration: none; display: flex; gap: 8px; align-items: center; }
.mark svg { width: 26px; height: 18px; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.nav a { font: 600 15px/1 var(--display); letter-spacing: .06em; text-transform: uppercase; color: var(--ink); text-decoration: none;
  padding: 0 10px; min-height: 44px; display: inline-flex; align-items: center; border-bottom: 3px solid transparent; }
.nav a[aria-current="page"], .nav a:hover { border-bottom-color: var(--signal); }

main { padding-block: 28px 64px; }
.crumbs { font: 13px/1.4 var(--mono); color: var(--muted); margin-bottom: 10px; }
.crumbs a { color: var(--muted); }
.head { display: grid; gap: 12px; padding-block: 8px 20px; }
.lede { font-size: 19px; line-height: 1.5; }
section.block { border-top: 2px solid var(--ink); padding-top: 18px; margin-top: 34px; display: grid; gap: 14px; }

/* cards and grids */
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.card { background: var(--sheet); border: 1px solid var(--rule); padding: 14px 16px; display: grid; gap: 6px; align-content: start;
  color: var(--ink); text-decoration: none; min-width: 0; }
a.card:hover { border-color: var(--ink); color: var(--ink); }
.card h3 { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.card .fig { height: 92px; display: flex; align-items: center; justify-content: center; }
.card .fig svg { max-height: 92px; max-width: 100%; }
.tag { font: 500 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; padding: 4px 6px; border: 1px solid currentColor; color: var(--muted); white-space: nowrap; }
.tag.exact { color: var(--flag-b); } .tag.old { color: var(--signal); } .tag.approx { color: var(--muted); } .tag.soon { color: var(--muted); }
.room-off { opacity: .62; }

/* tables */
.tablewrap { overflow-x: auto; background: var(--sheet); border: 1px solid var(--rule); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font: 500 12px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); position: sticky; top: 0; background: var(--sheet); }
tr.grp td { background: var(--tint); font: 600 13px/1.3 var(--display); letter-spacing: .06em; text-transform: uppercase; }
td.num { white-space: nowrap; }
tr.hist td { color: var(--muted); }

/* plates: live instruments */
.plate { background: var(--sheet); border: 1px solid var(--rule); padding: 16px; display: grid; gap: 12px; min-width: 0; }
.plate .label { font: 500 12px/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--signal); }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
input, select, button { font: 16px var(--body); color: var(--ink); background: var(--paper); border: 1px solid var(--rule); padding: 8px 10px; min-height: 44px; border-radius: 0; }
input[type=number] { width: 150px; font-family: var(--mono); }
.converter .ca { width: 9em; max-width: 100%; font-family: var(--mono); }
@media (max-width: 560px) { .converter select { flex: 1 1 calc(100% - 64px); } .converter .ca, .converter .ck { flex: 1 1 100%; width: 100%; } }
select { max-width: 100%; }
input[type=range] { padding: 0; border: 0; background: transparent; min-height: 44px; flex: 1; min-width: 140px; accent-color: var(--signal); }
button { font-family: var(--display); font-weight: 600; letter-spacing: .06em; text-transform: uppercase; cursor: pointer; background: var(--ink); color: var(--paper); border-color: var(--ink); }
button.ghost { background: transparent; color: var(--ink); }
.out { font: 500 clamp(20px, 4vw, 28px)/1.25 var(--mono); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.prov { font: 13px/1.55 var(--mono); color: var(--muted); background: var(--tint); padding: 8px 10px; overflow-wrap: anywhere; }
.then { border-left: 4px solid var(--signal); background: var(--sheet); padding: 10px 14px; display: grid; gap: 4px; }
.then b { font: 600 13px/1.3 var(--display); letter-spacing: .08em; text-transform: uppercase; color: var(--signal); }
section.block + .lens, .block .then { margin-top: 4px; }
.lens { margin-top: 18px; border-left: 4px solid var(--flag-b); background: var(--sheet); padding: 10px 14px; display: grid; gap: 4px; }
.lens b { font: 600 13px/1.3 var(--display); letter-spacing: .08em; text-transform: uppercase; color: var(--flag-b); }

/* shape page */
.shape { display: grid; gap: 16px; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: start; }
@media (max-width: 760px) { .shape { grid-template-columns: 1fr; } }
.figure { background: var(--sheet); border: 1px solid var(--rule); aspect-ratio: 4 / 3; max-width: 100%; position: relative; overflow: hidden; }
.figure svg, .figure canvas { width: 100%; height: 100%; display: block; }
.figure .hint { position: absolute; left: 10px; bottom: 8px; font: 12px var(--mono); color: var(--muted); pointer-events: none; }
.sliders { display: grid; gap: 2px; }
.sliders label { display: grid; grid-template-columns: minmax(84px, 36%) minmax(0, 1fr) 72px; gap: 10px; align-items: center; font-size: 15px; }
.sliders input[type=range] { min-width: 0; width: 100%; }
.sliders output { font: 500 15px var(--mono); text-align: right; font-variant-numeric: tabular-nums; }
.qty { display: grid; gap: 6px; }
.qty div { display: flex; justify-content: space-between; gap: 10px; border-bottom: 1px dotted var(--rule); padding-bottom: 4px; }
.qty span:last-child { font: 500 16px var(--mono); font-variant-numeric: tabular-nums; }
.formula { overflow-x: auto; padding: 4px 0; }
.warn { color: var(--signal); font-size: 15px; }
.unitsel { display: flex; gap: 6px; align-items: center; font-size: 14px; color: var(--muted); }
svg .shp { fill: color-mix(in srgb, var(--flag-b) 18%, transparent); stroke: var(--flag-b); stroke-width: 2; }
svg .shp2 { fill: var(--sheet); stroke: var(--flag-b); stroke-width: 2; }
svg .dim { stroke: var(--signal); stroke-width: 1.5; fill: none; }
svg .aux { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 4 3; fill: none; }
svg text { fill: var(--ink); font: 13px var(--mono); }
svg text.lbl { fill: var(--signal); }

/* ruler */
.ruler { overflow-x: auto; background: var(--sheet); border: 1px solid var(--rule); }
.ruler svg { display: block; min-width: 640px; width: 100%; height: 120px; }
.ruler line { stroke: var(--ink); }
.ruler .sel { stroke: var(--signal); stroke-width: 3; }

footer { border-top: 2px solid var(--ink); margin-top: 40px; padding-block: 18px 28px; font-size: 14px; color: var(--muted); }
footer .wrap { display: grid; gap: 6px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* ---------- wave 2: signal ---------- */
svg.flag { width: 90px; height: 60px; flex: none; display: block; }
svg.flag.sm { width: 48px; height: 32px; }
.flagstrip { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
.fgrid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.ftile { display: flex; gap: 14px; align-items: flex-start; background: var(--sheet); border: 1px solid var(--rule); padding: 12px; min-width: 0; }
.ftile h3 { font-size: 20px; }
.ftile p { font-size: 15px; }
.ftile:target { outline: 3px solid var(--flag-y); }
.hoist { position: relative; display: flex; justify-content: center; padding: 18px 0 8px; background: var(--tint); min-height: 120px; }
.hmast { display: grid; gap: 4px; border-left: 3px solid var(--muted); padding: 0 0 0 0; margin-left: 40px; }
.hflag svg { margin-left: -1px; }
.hflag { display: flex; gap: 12px; align-items: center; font: 14px var(--mono); }
.hflag.warn span { color: var(--signal); }
.lamp { width: 28px; height: 28px; border-radius: 50%; background: var(--tint); border: 2px solid var(--rule); display: inline-block; }
.lamp.lit { background: var(--flag-y); box-shadow: 0 0 18px var(--flag-y); }
.mbar { display: flex; flex-wrap: wrap; align-items: center; gap: 0; background: var(--tint); padding: 10px 8px; min-height: 32px; }
.mbar span { height: 12px; display: inline-block; }
.mbar span.on { background: var(--ink); }
.mbar span.lit { background: var(--signal); }
.morse-code { letter-spacing: .18em; font-size: 18px; white-space: nowrap; }
.out.good { color: var(--ok); } .out.bad { color: var(--signal); }
i.sb, i.pb { display: inline-block; height: 12px; background: var(--ink); border-radius: 6px; margin-right: 6px; vertical-align: middle; }
i.sb { width: 14px; } i.pb { width: 62px; }
button.blast { background: var(--sheet); color: var(--ink); border: 1px solid var(--rule); min-width: 160px; display: flex; align-items: center; }
button.blast.lit { border-color: var(--signal); box-shadow: inset 0 0 0 2px var(--signal); }
button.blast.lit i { background: var(--signal); }

/* ---------- wave 2: weather ---------- */
.seawrap { background: var(--tint); border: 1px solid var(--rule); }
#seacv { display: block; width: 100%; height: clamp(240px, 42vw, 380px); }
.hbar { height: 10px; background: var(--flag-b); min-width: 2px; }
.wxgrid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.wxtile { display: flex; gap: 12px; align-items: center; background: var(--sheet); border: 1px solid var(--rule); padding: 10px 12px; color: var(--ink); }
.wxtile p { font-size: 15px; }
svg.wx { width: 60px; height: 60px; flex: none; color: var(--ink); }
.mapwrap { overflow-x: auto; }
svg.map { width: 100%; min-width: 620px; height: auto; display: block; background: color-mix(in srgb, var(--flag-b) 10%, var(--sheet)); }
svg.map .land { fill: var(--tint); stroke: var(--muted); stroke-width: .5; }
svg.map .basin { fill: color-mix(in srgb, var(--signal) 22%, transparent); stroke: var(--signal); stroke-width: 1.2; }
svg.map .blbl { fill: var(--signal); font: 600 15px var(--mono); }
svg.map .eq { stroke: var(--muted); stroke-dasharray: 4 4; }

@media (max-width: 560px) { .nav { margin-left: 0; } .nav a { padding: 0 7px; font-size: 14px; } .bar .wrap { gap: 4px 10px; } }

/* ---------- wave 3: number ---------- */
td.sym, .sym { font: 400 26px/1.1 "Source Serif 4", "STIX Two Math", "Cambria Math", "Segoe UI Symbol", "Apple Symbols", "DejaVu Sans", serif; text-align: center; min-width: 2.2em; }
.gkgrid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.gk { display: flex; gap: 12px; align-items: flex-start; background: var(--sheet); border: 1px solid var(--rule); padding: 10px 12px; min-width: 0; }
.gk h3 { font-size: 19px; text-transform: capitalize; }
.gl { font: 400 34px/1 "Source Serif 4", Georgia, serif; display: flex; gap: 6px; align-items: baseline; min-width: 92px; flex-wrap: wrap; }
.gv { font-size: 20px; color: var(--muted); width: 100%; }
.drill { display: grid; gap: 12px; justify-items: start; }
.gbig { font: 400 88px/1 "Source Serif 4", Georgia, serif; min-width: 1.2em; }
.points { display: flex; flex-wrap: wrap; gap: 6px; }
.pt { font: 13px var(--mono); background: var(--sheet); border: 1px solid var(--rule); padding: 4px 8px; }
.rule-wrap { overflow-x: auto; background: var(--sheet); border: 1px solid var(--rule); }
.rule-wrap svg { display: block; width: 100%; min-width: 760px; height: auto; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
#sr line { stroke: var(--ink); stroke-width: 1; }
#sr text { font-family: var(--mono); }
#sr .sr-body { fill: var(--tint); stroke: var(--rule); }
#sr .sr-slide { fill: var(--sheet); stroke: var(--muted); cursor: ew-resize; }
#sr .sr-cursor { fill: color-mix(in srgb, var(--flag-b) 8%, transparent); stroke: var(--flag-b); stroke-width: 1; cursor: ew-resize; }
#sr line.sr-hair { stroke: var(--signal); stroke-width: 1.5; }
#uc text { font-family: var(--mono); }

/* ---------- wave 3: sky & sea ---------- */
.figure.globe { background: var(--sheet); touch-action: none; }
.figure.globe canvas { cursor: grab; }
.mapgrid { display: grid; gap: 12px; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); }
@media (max-width: 760px) { .mapgrid { grid-template-columns: 1fr; } }
.mapgrid figure { margin: 0; display: grid; gap: 6px; }
.mapbox { background: color-mix(in srgb, var(--flag-b) 9%, var(--sheet)); border: 1px solid var(--rule); }
.mapbox svg { display: block; width: 100%; height: auto; }
.mapbox .mland { fill: var(--tint); stroke: var(--muted); stroke-width: .6; }
.mapbox .mland.edge { fill: none; }
.mapbox .mgrat { fill: none; stroke: var(--muted); stroke-width: .4; opacity: .5; }
.mapbox .mgc, .key.gc { stroke: var(--signal); }
.mapbox .mrl, .key.rl { stroke: var(--flag-b); }
.mapbox .mgc, .mapbox .mrl { fill: none; stroke-width: 2.5; }
.mapbox .mrl { stroke-dasharray: 8 5; }
.mapbox .mport { fill: var(--ink); stroke: var(--sheet); stroke-width: 2; }
.mapbox .mlbl { font: 600 14px var(--mono); fill: var(--ink); paint-order: stroke; stroke: var(--sheet); stroke-width: 3px; }
.key { display: inline-block; width: 28px; border-top: 3px solid; vertical-align: middle; }
.key.rl { border-top-style: dashed; }
.key.gc { border-color: var(--signal); } .key.rl { border-color: var(--flag-b); }
.clocks { display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.clock { background: var(--paper); border: 1px solid var(--rule); padding: 10px 12px; display: grid; gap: 2px; }
.clock .ck { font: 600 13px/1.2 var(--display); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.clock .cv { font: 500 30px/1.15 var(--mono); font-variant-numeric: tabular-nums; }
.clock .cv.sm { font-size: 22px; }
.clock .cn { font-size: 13px; color: var(--muted); }
.figure.eot, .figure.band { aspect-ratio: auto; }
.figure.band { overflow-x: auto; }
.figure.band svg { min-width: 760px; }
#band text, #eot text, #ana text, #orr text { font-family: var(--mono); }
#band .b-sign { fill: color-mix(in srgb, var(--flag-b) 10%, var(--sheet)); stroke: var(--rule); }
#band .b-sign.alt { fill: color-mix(in srgb, var(--flag-b) 18%, var(--sheet)); }
#band .b-con { fill: color-mix(in srgb, var(--flag-y) 22%, var(--sheet)); stroke: var(--rule); }
#band .b-con.alt { fill: color-mix(in srgb, var(--flag-y) 40%, var(--sheet)); }
#band .b-con.oph { fill: color-mix(in srgb, var(--signal) 30%, var(--sheet)); }
tr.hl td { background: color-mix(in srgb, var(--signal) 10%, var(--sheet)); }
.pdot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; vertical-align: middle; }

/* ---- wave 4: ship ---- */
.figure.mid, .figure.ll, .figure.gzc { aspect-ratio: auto; }
.figure.mid { max-width: 960px; }
#mid { touch-action: manipulation; }
#mid .ps { fill: none; stroke: var(--ink); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
#mid .shellp { stroke-width: 4.5; }
#mid .keelp { stroke-width: 8; stroke-linecap: butt; }
#mid .pf { stroke: var(--ink); stroke-width: 1; }
#mid .floorf { fill: color-mix(in srgb, var(--flag-b) 14%, var(--sheet)); }
#mid .framef { fill: color-mix(in srgb, var(--ink) 45%, var(--sheet)); }
#mid .brk { fill: color-mix(in srgb, var(--ink) 28%, var(--sheet)); }
#mid .hit { fill: none; stroke: transparent; stroke-width: 18; pointer-events: stroke; }
#mid .part { cursor: pointer; }
#mid .part .callout circle { fill: var(--sheet); stroke: var(--ink); stroke-width: 1.2; }
#mid .part .callout text { font: 600 11px var(--mono); fill: var(--ink); }
#mid.picking .part { opacity: .28; }
#mid.picking .part.on { opacity: 1; }
#mid .part.on .ps { stroke: var(--signal); }
#mid .part.on .pf { fill: color-mix(in srgb, var(--signal) 45%, var(--sheet)); stroke: var(--signal); }
#mid .part.on .callout circle { fill: var(--signal); stroke: var(--signal); }
#mid .part.on .callout text { fill: #fff; }
#mid.sys-tr .lg, #mid.sys-lg .tr { display: none; }
#mid .lgdots circle { fill: var(--ink); }
#mid .sea, #stsvg .sea { fill: color-mix(in srgb, var(--flag-b) 12%, var(--sheet)); }
#mid .wl, #stsvg .wl { stroke: var(--flag-b); stroke-width: 1.5; stroke-dasharray: 8 5; }
#mid .wlt { font: 11px var(--mono); fill: var(--muted); }
#mid .cl, #stsvg .cl { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 10 4 2 4; }
#mid .strk { font: 600 11px var(--mono); fill: var(--flag-b); }
.legend { columns: 2 260px; column-gap: 24px; }
.legend .label { break-after: avoid; margin-top: 8px; }
ol.parts { margin: 4px 0 8px; padding-left: 2.2em; }
ol.parts li { margin: 2px 0; break-inside: avoid; }
ol.parts button { min-height: 44px; padding: 6px 10px; font: 15px var(--body); text-transform: none; letter-spacing: 0; text-align: left; }
ol.parts button[aria-pressed="true"] { background: var(--signal); color: #fff; border-color: var(--signal); }
#llsvg .llsea { fill: color-mix(in srgb, var(--flag-b) 12%, var(--sheet)); }
#llsvg .llwl { stroke: var(--flag-b); stroke-width: 1.5; stroke-dasharray: 8 5; }
#llsvg .llm { fill: var(--ink); }
#llsvg .llring { fill: none; stroke: var(--ink); }
#llsvg .llbrk { fill: none; stroke: var(--muted); stroke-width: 1.2; }
#llsvg .lltx { font: 12px var(--mono); fill: var(--muted); }
#llsvg .llk { font: 600 18px var(--display); fill: var(--ink); }
#llsvg .llauth { font-family: var(--display); font-weight: 600; fill: var(--ink); }
#stsvg .hullp { fill: var(--sheet); stroke: var(--ink); stroke-width: 2; }
#stsvg .subp { fill: color-mix(in srgb, var(--flag-b) 28%, transparent); stroke: none; }
#stsvg .tankp { fill: none; stroke: var(--muted); stroke-width: 1.2; }
#stsvg .liqp { fill: color-mix(in srgb, var(--ok) 40%, transparent); }
#stsvg .fup { stroke: var(--flag-b); stroke-width: 2; marker-end: none; }
#stsvg .fdn { stroke: var(--signal); stroke-width: 2; }
#stsvg .gzl { stroke: var(--ink); stroke-width: 3; }
#stsvg .pg, #gzsvg .pg { fill: var(--signal); stroke: var(--sheet); stroke-width: 1.5; }
#stsvg .pb { fill: var(--flag-b); stroke: var(--sheet); stroke-width: 1.5; }
#stsvg .pm, #gzsvg .pm { fill: var(--flag-y); stroke: var(--ink); stroke-width: 1; }
#stsvg .pz { fill: var(--ink); }
#stsvg text, #gzsvg text { font: 12px var(--mono); fill: var(--ink); }
#stsvg text.lbl { font: 600 14px var(--mono); }
#stsvg .small-t { fill: var(--muted); font-size: 11px; }
#gzsvg .grid { stroke: var(--rule); stroke-width: 1; }
#gzsvg .axis { stroke: var(--ink); stroke-width: 1.2; }
#gzsvg .ar1 { fill: color-mix(in srgb, var(--flag-b) 16%, transparent); }
#gzsvg .ar2 { fill: color-mix(in srgb, var(--flag-b) 32%, transparent); }
#gzsvg .tan { stroke: var(--muted); stroke-width: 1.2; stroke-dasharray: 6 4; }
#gzsvg .gzc { fill: none; stroke: var(--ink); stroke-width: 2.5; }
#gzsvg .now { stroke: var(--signal); stroke-width: 1; stroke-dasharray: 3 3; }
.tag.warn { color: var(--signal); border-color: var(--signal); }

/* ---- wave 4: code of life ---- */
.basegrid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.basefig, .pairfig { margin: 0; background: var(--sheet); border: 1px solid var(--rule); padding: 8px; display: grid; gap: 4px; }
.basefig figcaption { font-size: 14px; color: var(--muted); text-align: center; }
.pairs { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.pairfig svg, .basefig svg, .nucfig svg { width: 100%; height: auto; display: block; }
.nucfig { background: var(--sheet); border: 1px solid var(--rule); padding: 8px; max-width: 560px; }
svg .bd { stroke: var(--ink); stroke-width: 1.7; stroke-linecap: round; }
svg .bd.sug { stroke-dasharray: 3 3; }
svg .hb { stroke: var(--signal); stroke-width: 1.6; stroke-dasharray: 4 3; }
svg .at { font: 500 14px var(--mono); fill: var(--ink); }
svg .at.ox { fill: var(--signal); }
svg .at.ni { fill: var(--flag-b); }
svg .num-t { font: 9px var(--mono); fill: var(--muted); }
svg .small-t { font: 10px var(--mono); fill: var(--muted); }
svg .phos { fill: color-mix(in srgb, var(--flag-y) 45%, var(--sheet)); stroke: var(--ink); }
svg .basebox { fill: color-mix(in srgb, var(--flag-b) 12%, var(--sheet)); stroke: var(--ink); }
.seqout .seq { word-break: break-all; font-size: 16px; line-height: 1.9; margin: 6px 0; }
.seqout mark { color: var(--ink); padding: 1px 0; }
.seqout mark.m1 { background: color-mix(in srgb, var(--flag-y) 55%, transparent); }
.seqout mark.m2 { background: color-mix(in srgb, var(--flag-b) 30%, transparent); }
.seqout mark.m3 { background: color-mix(in srgb, var(--ok) 40%, transparent); }
.qty .wrapnum { word-break: break-all; text-align: right; }
textarea { font-size: 16px; color: var(--ink); background: var(--paper); border: 1px solid var(--rule); padding: 8px 10px; }
.plate + .plate { margin-top: 12px; }
@media (max-width: 700px) { .figure.mid { overflow-x: auto; } .figure.mid svg { width: 680px; height: auto; } }

[hidden] { display: none !important; }
/* Light room: the optical bench (always a dark table, so rays read as light in both themes) */
.figure.bench { aspect-ratio: 16 / 10; background: #0b1218; touch-action: none; border-color: #22313b; }
.figure.bench canvas { cursor: grab; }
.figure.bench.wide { aspect-ratio: 16 / 8; }
.figure.bench .hint { color: #9aa9b1; }
@media (max-width: 760px) { .figure.bench, .figure.bench.wide { aspect-ratio: 4 / 3; } }
.sliders select { width: 100%; min-width: 0; }
.sliders label.check { display: flex; gap: 10px; align-items: center; min-height: 44px; }
.sliders label.check input { width: 22px; height: 22px; min-height: 0; }
.figure.chart { aspect-ratio: auto; margin-top: 12px; padding: 6px; }
.figure.chart svg { height: auto; }
.figure.chart text { font: 12px var(--mono); fill: var(--muted); }
.figure.chart .gl { stroke: var(--rule); stroke-width: 1; }
.figure.chart .cur { stroke: var(--flag-y); stroke-width: 2; stroke-dasharray: 4 3; }