/*
  Layout and element styles for theme B2 "Contour". All values come from tokens.css.
  Sections: base, header and footer, documentation pages, Home (chart sheet, sources
  flow, tide-curve proof, release contents), motion.
*/

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  overflow-wrap: break-word;
}
svg { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
.wrap { max-width: var(--content-max); margin-inline: auto; padding-inline: var(--gutter); }

h1, h2, h3 { font-family: var(--font-heading); font-weight: var(--font-weight-heading); line-height: var(--line-height-heading); letter-spacing: var(--tracking-heading); text-wrap: balance; }
h1 { font-size: var(--font-size-h1); letter-spacing: var(--tracking-title); line-height: 1.1; margin: 0 0 var(--space-5); }
h2 { font-size: var(--font-size-h2); margin: 0 0 var(--space-5); }
h3 { font-size: var(--font-size-h3); font-weight: 600; line-height: 1.5; margin: 0 0 var(--space-2); letter-spacing: 0; }
[id] { scroll-margin-top: calc(var(--header-h) + var(--space-4)); }
p { margin: 0 0 var(--space-flow); line-height: var(--line-height-prose); text-wrap: pretty; }
.place { font-family: var(--font-label); font-style: italic; font-weight: 500; }

a { color: var(--color-link); text-underline-offset: 0.2em; text-decoration-thickness: 1px; transition: color var(--duration-fast) var(--easing); }
a:hover { color: var(--color-link-hover); text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; border-radius: var(--radius-sm); }

code, pre, kbd { font-family: var(--font-mono); font-feature-settings: var(--font-features-mono); }
code { font-size: 0.85em; background: var(--color-code-bg); color: var(--color-code-text); padding: 0.06em 0.32em; border-radius: var(--radius-sm); overflow-wrap: anywhere; }
pre { margin: 0 0 var(--space-5); background: var(--color-code-bg); color: var(--color-code-text); padding: var(--space-4) var(--space-5); overflow-x: auto; font-size: 0.85rem; line-height: 1.7; border-radius: var(--radius-md); border: var(--border-width) solid var(--color-border); }
pre code { background: none; padding: 0; font-size: inherit; overflow-wrap: normal; }

.lead { font-size: var(--font-size-lead); line-height: var(--line-height-lead); color: var(--color-prose); max-width: var(--measure-lead); }
.muted, small { color: var(--color-text-muted); }
.pending { font-style: italic; color: var(--color-text-muted); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.skip-link { position: absolute; z-index: var(--z-skip); left: var(--space-2); top: -4rem; background: var(--color-bg); color: var(--color-text); padding: var(--space-2) var(--space-3); border: 2px solid var(--color-accent); }
.skip-link:focus { top: var(--space-2); }

/* Status note: a magenta frame, as cautions are printed on a chart */
.note { border: 2px solid var(--color-note-border); background: var(--color-note-bg); color: var(--color-note-text); padding: var(--space-4) var(--space-5); border-radius: var(--radius-sm); margin-block: var(--space-5); }
.note > :first-child { margin-top: 0; }
.note > :last-child { margin-bottom: 0; }
.note strong { color: var(--color-link); }
.note a { color: inherit; }

/* Tables: the wrapper scrolls, the page does not */
.table-wrap { overflow-x: auto; margin-block: var(--space-5); }
table { border-collapse: collapse; width: 100%; font-size: var(--font-size-small); }
.table-wrap table { min-width: 34rem; }  /* narrow screens scroll the table, not the page */
caption { caption-side: top; text-align: left; font-family: var(--font-heading); font-weight: 600; font-size: 1rem; padding-bottom: var(--space-3); }
th, td { text-align: left; vertical-align: top; padding: var(--space-3) var(--space-4) var(--space-3) 0; border-bottom: var(--border-width) solid var(--color-border); }
th:last-child, td:last-child { padding-right: 0; }
thead th { font-family: var(--font-mono); font-size: var(--font-size-label); color: var(--color-text-muted); font-weight: 600; border-bottom: 1.5px solid var(--color-text); white-space: nowrap; vertical-align: bottom; }
tbody th { font-weight: 500; }
td.num, th.num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
table code { white-space: nowrap; overflow-wrap: normal; }

/* ---------- Header and footer ---------- */
/* The header pins to the top. assets/header.js adds .is-stuck once the page scrolls, which
   brings in the bottom rule; without the script the rule is always there. */
.site-header { position: sticky; top: 0; z-index: var(--z-sticky); background: var(--color-bg); border-bottom: var(--border-width) solid var(--color-border); transition: border-color var(--duration-fast) var(--easing), box-shadow var(--duration-fast) var(--easing); }
.js-header .site-header:not(.is-stuck) { border-bottom-color: transparent; }
.site-header.is-stuck { box-shadow: 0 1px 0 var(--color-border), 0 6px 16px -12px oklch(0 0 0 / 0.35); }
.top-sentinel { position: absolute; top: 0; left: 0; width: 1px; height: 1px; pointer-events: none; }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2) var(--space-6); padding-block: var(--space-4); }
.brand { display: inline-flex; align-items: center; gap: var(--space-2); color: var(--color-text); text-decoration: none; font-family: var(--font-mono); font-weight: 600; font-size: 1rem; }
.brand svg { width: 22px; height: 22px; flex: none; }
.brand span { white-space: nowrap; }
.nav-wrap { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3) var(--space-4); }
.nav-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--space-1) 0.875rem; font-size: var(--font-size-small); font-weight: 500; }
.nav-list a { color: var(--color-text); text-decoration: none; }
.nav-list a:hover { color: var(--color-link); text-decoration: underline; }
.nav-list a[aria-current="page"] { color: var(--color-link); font-weight: 600; text-decoration: underline; text-decoration-thickness: 2px; }
.mode { font: inherit; font-family: var(--font-mono); font-size: 0.75rem; white-space: nowrap; min-height: 2rem; color: var(--color-text-muted); background: none; border: var(--border-width) solid var(--color-border); border-radius: var(--radius-md); padding: 0.35rem 0.7rem; cursor: pointer; transition: color var(--duration-fast) var(--easing), border-color var(--duration-fast) var(--easing); }
.mode:hover { color: var(--color-text); border-color: var(--color-text-muted); }

/* Below the width where all eleven links fit beside the brand (phones, tablets): brand and palette
   button on one line, the navigation one sideways-scrolling row below */
@media (max-width: 70rem) {
  .header-inner { padding-block: var(--space-3) 0; gap: 0 var(--space-4); }
  .nav-wrap { display: contents; }
  .mode { order: 1; }
  .nav-wrap > nav { order: 2; flex: 1 0 100%; min-width: 0; margin-inline: calc(-1 * var(--gutter)); }
  .nav-list { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; gap: var(--space-5); padding: var(--space-3) var(--gutter); font-size: var(--font-size-label);
    mask-image: linear-gradient(to right, transparent, #000 var(--gutter), #000 calc(100% - 2.5rem), transparent); }
  .nav-list::-webkit-scrollbar { display: none; }
  .nav-list li { flex: none; }
}
.site-footer { font-size: var(--font-size-small); color: var(--color-text-muted); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-4); padding-block: var(--space-7); border-top: var(--border-width) solid var(--color-border); }
.footer-inner p { margin: 0; max-width: 62ch; }
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); font-weight: 500; }

/* ---------- Documentation pages ---------- */
.doc { padding-block: var(--space-7) var(--space-8); }
.doc > * { max-width: var(--measure); }
.doc > .table-wrap, .doc > h1 { max-width: none; }
/* The page title sits on a graduated neatline, the border of a printed chart */
.doc > h1 {
  margin-bottom: var(--space-5);
  background:
    repeating-linear-gradient(to right, var(--color-text) 0 48px, transparent 48px 96px) left bottom / 100% 5px no-repeat,
    linear-gradient(var(--color-text), var(--color-text)) left calc(100% - 9px) / 100% 1px no-repeat;
  padding-bottom: calc(var(--space-5) + 10px);
}
.doc > .lead { max-width: var(--measure-lead); }
.doc > h1 + .lead { margin-bottom: var(--space-6); }
/* Running text one step softer than headings; bold run-in labels keep the heading colour */
.doc p, .doc li, .doc dd { color: var(--color-prose); }
.doc li, .doc dd { line-height: var(--line-height-prose); }
.doc :is(p, li, dd) strong { color: var(--color-text); }
.doc .note p, .doc .note li { color: var(--color-note-text); }
.doc h2 { margin-top: var(--space-8); letter-spacing: var(--tracking-doc); }
.doc h1 + h2, .doc .lead + h2 { margin-top: var(--space-6); }
.doc h3 { margin-top: var(--space-6); margin-bottom: var(--space-3); }
.doc ul, .doc ol { padding-left: 1.3rem; }
.doc li { margin-block: var(--space-3); }
.doc li::marker { color: var(--color-text-muted); }
.doc ol > li::marker { color: var(--color-link); font-weight: 600; font-family: var(--font-mono); font-size: 0.9em; }
.doc em { font-style: italic; }
.doc pre { white-space: pre-wrap; }  /* citations and commands wrap instead of scrolling */

/* Definition lists: a label column on wide screens, as in a chart's source diagram */
.doc dl { margin: var(--space-4) 0 var(--space-5); display: grid; grid-template-columns: minmax(9rem, 13rem) 1fr; gap: 0 var(--space-5); }
.doc dt { font-family: var(--font-heading); font-weight: 600; padding-block: var(--space-3); border-top: var(--border-width) solid var(--color-border); }
.doc dd { margin: 0; padding-block: var(--space-3); border-top: var(--border-width) solid var(--color-border); }
.doc dd > :last-child { margin-bottom: 0; }
.doc section { margin-top: var(--space-6); }
.doc section > h3 { margin-top: 0; padding-top: var(--space-5); border-top: 2px solid var(--color-text); }
@media (max-width: 40rem) {
  .doc dl { grid-template-columns: 1fr; }
  .doc dt { padding-bottom: 0; }
  .doc dd { border-top: 0; padding-top: var(--space-1); }
}

/* ---------- Home ---------- */
.section { padding-top: var(--space-8); }
.section-head { max-width: 46rem; text-wrap: pretty; margin-bottom: var(--space-head); }
.section-head p { color: var(--color-prose); font-size: var(--font-size-sub); line-height: var(--line-height-lead); max-width: var(--measure-lead); margin: 0; }
.tag { display: inline-block; font-family: var(--font-mono); font-size: 0.75rem; font-weight: 500; letter-spacing: 0; color: var(--color-link); border: 1.5px solid currentColor; border-radius: 999px; padding: 0.15rem 0.75rem; vertical-align: 0.3em; white-space: nowrap; }
.actions { display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-5); align-items: center; margin-top: var(--space-5); }
.button { display: inline-flex; gap: var(--space-2); align-items: center; background: var(--color-accent); color: var(--color-on-accent); text-decoration: none; font-family: var(--font-mono); font-size: var(--font-size-small); font-weight: 600; padding: 0.75rem 1.75rem; border-radius: var(--radius-md); transition: background var(--duration-fast) var(--easing); }
.button:hover { background: var(--color-link-hover); color: var(--color-on-accent); text-decoration: none; }
.button span { transition: transform 260ms var(--easing); }
.button:hover span { transform: translateX(4px); }
.more { font-family: var(--font-mono); font-size: var(--font-size-small); font-weight: 500; }

/* Hero: a chart sheet of Helgoland in a graduated border, with the title in a cartouche */
.sheet { padding-block: var(--space-5) 0; }
.sheet-frame {
  --bar: 6px;
  position: relative; display: grid; padding: calc(var(--bar) + 4px); border: var(--border-width) solid var(--color-text);
  background:
    repeating-linear-gradient(to right, var(--color-text) 0 48px, transparent 48px 96px) top / 100% var(--bar) no-repeat,
    repeating-linear-gradient(to right, var(--color-text) 0 48px, transparent 48px 96px) bottom / 100% var(--bar) no-repeat,
    repeating-linear-gradient(to bottom, var(--color-text) 0 48px, transparent 48px 96px) left / var(--bar) 100% no-repeat,
    repeating-linear-gradient(to bottom, var(--color-text) 0 48px, transparent 48px 96px) right / var(--bar) 100% no-repeat,
    var(--color-bg);
}
.sheet-art { grid-area: 1 / 1; position: relative; border: var(--border-width) solid var(--color-text); min-height: 35rem; overflow: hidden; }
.sheet-map { position: absolute; inset: 0; width: 100%; height: 100%; max-width: none; }
.title-block { grid-area: 1 / 1; align-self: start; justify-self: start; z-index: 1; margin: clamp(1rem, 3vw, 2.5rem); max-width: 37rem; background: var(--color-panel); border: var(--border-width) solid var(--color-text); outline: 3px double var(--color-text); outline-offset: 4px; padding: clamp(1.25rem, 2.5vw, 2.25rem); }
.title-block h1 { font-family: var(--font-display); font-size: var(--font-size-display); font-weight: 700; line-height: 1.08; letter-spacing: var(--tracking-display); margin: 0 0 var(--space-5); }
.title-block h1 em { font-style: normal; color: var(--color-link); }
.title-block .lead { margin: 0; }
.sheet-note { grid-area: 1 / 1; align-self: start; justify-self: end; z-index: 1; margin: clamp(1rem, 3vw, 2rem); max-width: 22rem; background: var(--color-panel); border: 2px solid var(--color-accent); padding: var(--space-3) var(--space-4); font-size: var(--font-size-small); }
.sheet-note .place { color: var(--color-link); font-size: 1.05rem; }
.lat, .lon { position: absolute; font-family: var(--font-mono); font-size: 0.72rem; color: var(--color-text); background: var(--color-bg); padding: 0 4px; line-height: 1.4; }
/* Set on graticule lines of the chart: y 110 and 330, x 600 and 960 */
.lat { right: 0; transform: translateY(-50%); } .lat.l1 { top: 25%; } .lat.l2 { top: 50%; }
.lon { top: 0; transform: translateX(-50%); } .lon.o1 { left: 50%; } .lon.o2 { left: 80%; }
.sheet + .wrap .note { margin-top: var(--space-5); margin-bottom: 0; }

/* Chart symbology inside the sheet */
.sheet-map .water { fill: var(--color-bg); }
/* The chart features sit in .chart. On wide screens they are scaled toward the right edge so that they stay clear of the title panel. */
.sheet-map .chart { transform-box: view-box; transform-origin: 1190px 400px; transform: scale(0.95); }
.sheet-map .grat { stroke: var(--color-grat); stroke-width: 1; fill: none; }
.sheet-map .fill-shallow { fill: var(--color-shallow); }
.sheet-map .fill-shoal { fill: var(--color-shoal); }
.sheet-map .dc { fill: none; stroke: var(--color-contour); stroke-width: 1.2; stroke-dasharray: 1; stroke-dashoffset: 0; animation: sheet-draw 2200ms var(--easing-expo) both; animation-delay: calc(var(--i) * 140ms); }
.sheet-map .d30, .sheet-map .d20 { stroke-dasharray: none; stroke-width: 1; opacity: 0.8; animation: fade-in 1400ms var(--easing) both; }
.sheet-map .d30 { stroke-dasharray: 6 5; }
.sheet-map .land { fill: var(--color-land); stroke: var(--color-coast); stroke-width: 1.6; }
.sheet-map .snd text { font-family: var(--font-mono); font-style: italic; font-size: 14px; fill: var(--color-sounding); animation: fade-in 900ms var(--easing) both; animation-delay: calc(600ms + var(--d) * 22ms); }
.sheet-map .snd .sub { font-size: 10px; }
.sheet-map .rose { color: var(--color-accent); transform-box: view-box; transform-origin: 1070px 548px; animation: rose-turn 2400ms var(--easing-expo) both; }
.sheet-map .ring { fill: none; stroke: currentColor; stroke-width: 1.6; }
.sheet-map .ring.thin { stroke-width: 0.8; }
.sheet-map .rtick { stroke: currentColor; stroke-width: 1.1; }
.sheet-map .star4 { fill: currentColor; }
.sheet-map .star8 { fill: var(--color-bg); stroke: currentColor; stroke-width: 1.2; }
.sheet-map .rlab text { font-family: var(--font-mono); font-size: 13px; fill: currentColor; text-anchor: middle; }
.sheet-map .pname { font-family: var(--font-label); font-style: italic; font-weight: 500; font-size: 28px; fill: var(--color-text); }
.sheet-map .pname.sea { font-size: 26px; letter-spacing: 0.22em; fill: var(--color-sounding); }
.sheet-map .gauge { fill: var(--color-accent); stroke: var(--color-accent); stroke-width: 2.4; }
.sheet-map .gauge path { fill: none; }
.sheet-map .gauge-lab { font-family: var(--font-mono); font-weight: 600; font-size: 16px; fill: var(--color-accent); }
.sheet-map .tdiamond path { fill: var(--color-bg); stroke: var(--color-accent); stroke-width: 2.5; }
.sheet-map .tdiamond text { font-family: var(--font-mono); font-weight: 600; font-size: 18px; fill: var(--color-accent); }
.sheet-map .limit { fill: none; stroke: var(--color-accent); stroke-width: 2; stroke-dasharray: 14 6 3 6; opacity: 0.85; }

/* Sources flow: three kinds of source run together into one release */
.streams { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-5); }
.stream { margin: 0; padding: var(--space-4) var(--space-5) var(--space-5); background: var(--color-shallow); border: var(--border-width) solid var(--color-contour); }
.stream h3 { margin-bottom: var(--space-1); }
.stream .rank { margin: 0 0 var(--space-3); font-size: var(--font-size-small); color: var(--color-text); }
.stream ul { list-style: none; margin: 0; padding: 0; }
.stream li { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0 var(--space-3); padding-block: var(--space-2); border-top: var(--border-width) solid var(--color-contour); margin: 0; }
.stream li a { font-weight: 600; }
.stream .country { color: var(--color-text); font-size: 0.9rem; }
.confluence { display: block; width: 100%; height: 5rem; overflow: visible; }
.confluence path { fill: none; stroke: var(--color-contour); stroke-width: 2; vector-effect: non-scaling-stroke; }
.confluence .main { stroke: var(--color-accent); stroke-width: 3; }
.release {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: var(--space-4) var(--space-7); align-items: start;
  background: var(--color-panel); border: var(--border-width) solid var(--color-text); outline: 3px double var(--color-text); outline-offset: 4px;
  padding: clamp(1.25rem, 2.5vw, 2rem); margin: 0 4px;
}
.release h3 { font-size: 1.5rem; font-weight: 700; letter-spacing: var(--tracking-heading); margin-bottom: var(--space-2); }
.release .stem { font-family: var(--font-mono); font-weight: 600; font-size: clamp(1rem, 0.8rem + 1vw, 1.35rem); margin: 0 0 var(--space-3); overflow-wrap: anywhere; }
.release .pending { margin: 0; }
.release ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); gap: var(--space-3) var(--space-6); }
.release li { margin: 0; padding-left: 1.5rem; position: relative; }
.release li::before { content: ""; position: absolute; left: 0.15rem; top: 0.5rem; width: 0.6rem; height: 0.6rem; border: 2px solid var(--color-accent); transform: rotate(45deg); }
.flow-key { font-size: var(--font-size-small); color: var(--color-text-muted); margin: var(--space-5) 0 0; }

/* Proof: the tide curve on a graticule */
.proof { margin-top: var(--space-8); padding-block: var(--space-8); background-color: var(--color-d10);
  background-image: linear-gradient(var(--color-grat) 1px, transparent 1px), linear-gradient(90deg, var(--color-grat) 1px, transparent 1px);
  background-size: var(--graticule); background-position: -1px -1px; border-block: var(--border-width) solid var(--color-text); }
.proof .section-head { background: var(--color-panel); padding: var(--space-4) var(--space-5); border: var(--border-width) solid var(--color-text); }
.proof .section-head p { color: var(--color-prose); }
.proof .section-head p + p { margin-top: var(--space-3); }
.plot { background: var(--color-panel); border: var(--border-width) solid var(--color-text); padding: var(--space-4) var(--space-5) var(--space-5); }
.plot-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-1) var(--space-5); margin-bottom: var(--space-2); }
.plot-head p { margin: 0; color: var(--color-text-muted); font-size: var(--font-size-small); }
.plot-head .place { font-size: 1.6rem; color: var(--color-text); }
.plot-box svg { width: 100%; height: auto; overflow: visible; }
.tide.compact { display: none; }
.tide .g { stroke: var(--color-plot-grid); stroke-width: 1; fill: none; }
.tide .g3 { stroke: var(--color-plot-grid-strong); }
.tide .ticks text { font-family: var(--font-mono); font-size: calc(var(--fs) * 0.8); fill: var(--color-text-muted); text-anchor: middle; }
.tide .c { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.tide .c-official { stroke: var(--color-plot-official); stroke-width: 3; stroke-dasharray: 1; }
.tide .c-ticon { stroke: var(--color-plot-ticon); stroke-width: 3; stroke-dasharray: 11 7; }
.tide .c-fit { stroke: var(--color-plot-fit); stroke-width: 3.5; }
/* The plot shows its final state by default. assets/plot.js adds .play when the plot first
   scrolls into view: the official curve draws, then TICON-4 and our fit slide out to their lag. */
.plot.play .tide .c-official { animation: curve-draw 1300ms var(--easing) both; }
.plot.play .tide .c-ticon { animation: curve-lag 1500ms 1200ms var(--easing-expo) both; }
.plot.play .tide .c-fit { animation: curve-lag 1200ms 1500ms var(--easing-expo) both; }
.plot.play .tide .marks { animation: fade-in 700ms 2500ms var(--easing) both; }
.tide .lead { stroke: var(--color-plot-grid-strong); stroke-width: 1.2; stroke-dasharray: 3 3; fill: none; }
.tide .span { stroke: var(--color-plot-ticon); stroke-width: 2.4; fill: none; }
.tide .hw-ti { fill: var(--color-panel); stroke: var(--color-plot-ticon); stroke-width: 3; }
.tide .hw-fit { fill: var(--color-plot-fit); stroke: var(--color-panel); stroke-width: 2; }
.tide .hw-official { fill: var(--color-panel); stroke: var(--color-plot-official); stroke-width: 2; }
.tide .lab { font-family: var(--font-mono); font-weight: 600; font-size: var(--fs); }
.tide .lab-ti { fill: var(--color-plot-ticon); }
.tide .lab-fit { fill: var(--color-plot-fit); }
.plot figcaption { margin-top: var(--space-4); font-size: var(--font-size-small); color: var(--color-text-muted); }
.plot-key { list-style: none; margin: 0 0 var(--space-3); padding: 0; display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); font-family: var(--font-mono); font-size: var(--font-size-label); color: var(--color-text); }
.plot-key li { display: inline-flex; align-items: flex-start; gap: var(--space-2); margin: 0; }
.plot-key i { display: inline-block; width: 28px; height: 0; border-top: 3px solid; flex: none; margin-top: 0.75em; }
.plot-key .k-official { border-color: var(--color-plot-official); }
.plot-key .k-ticon { border-top-style: dashed; border-color: var(--color-plot-ticon); }
.plot-key .k-fit { border-color: var(--color-plot-fit); }
.plot figcaption p { margin: 0; max-width: 72ch; }

/* What every release carries: diamond-marked list, first item leads */
.marked { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr)); gap: var(--space-6) var(--space-7); }
.marked li { display: grid; grid-template-columns: 1.25rem 1fr; gap: var(--space-3); margin: 0; }
.marked li::before { content: ""; width: 0.8rem; height: 0.8rem; border: 2px solid var(--color-accent); transform: rotate(45deg); margin-top: 0.35rem; margin-left: 0.15rem; }
.marked li.first { grid-column: 1 / -1; padding-bottom: var(--space-5); border-bottom: var(--border-width) solid var(--color-border); }
.marked li.first::before { background: var(--color-accent); width: 1rem; height: 1rem; margin-top: 0.5rem; }
.marked li.first h3 { font-size: var(--font-size-h2); font-weight: 700; letter-spacing: var(--tracking-heading); line-height: var(--line-height-heading); }
.marked li.first p { font-size: var(--font-size-lead); line-height: var(--line-height-lead); max-width: 70ch; color: var(--color-prose); }
.marked h3 { margin-bottom: var(--space-1); }
.marked p { margin: 0; color: var(--color-prose); font-size: 0.95rem; }

.glance .table-wrap { margin-block: var(--space-5) var(--space-6); }
.glance > p { max-width: var(--measure); }
.page-index main > .section:last-child { padding-bottom: var(--space-8); }

@media (max-width: 75rem) {
  .title-block { max-width: min(37rem, 54%); }
  .sheet-map .chart { transform: scale(0.88); }
}
@media (max-width: 60rem) {
  .sheet-frame { grid-template-rows: auto auto auto; }
  .sheet-art { grid-area: 1 / 1; min-height: 0; height: 19rem; }
  .sheet-map .chart { transform-origin: 935px 415px; transform: translate(-210px, 0) scale(1.35); }
  .title-block { grid-area: 2 / 1; margin: var(--space-4) 0 0; max-width: none; outline: 0; border: 0; padding: var(--space-4) var(--space-2) 0; background: none; }
  .sheet-note { grid-area: 3 / 1; justify-self: stretch; max-width: none; margin: var(--space-5) 0 var(--space-2); }
  .lat.l2, .lon.o1 { display: none; }
  .lon.o2 { left: 75%; }
  .streams { grid-template-columns: 1fr; gap: var(--space-4); }
  .confluence { display: none; }
  .release { grid-template-columns: 1fr; margin-top: var(--space-6); position: relative; }
  .release::before { content: ""; position: absolute; left: 50%; top: calc(-1 * var(--space-6) - 4px); height: var(--space-6); width: 3px; margin-left: -1.5px; background: var(--color-accent); }
}
@media (max-width: 40rem) {
  .tide.wide { display: none; }
  .tide.compact { display: block; }
  .plot { padding-inline: var(--space-3); }
}

/* ---------- Motion ---------- */
@keyframes sheet-draw { from { stroke-dashoffset: 1; } to { stroke-dashoffset: 0; } }
@keyframes fade-in { from { opacity: 0; } }
@keyframes rose-turn { from { transform: rotate(-40deg); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes curve-draw { from { stroke-dashoffset: 1; } to { stroke-dashoffset: 0; } }
@keyframes curve-lag { from { transform: translateX(var(--dx)); opacity: 0; } 25% { opacity: 1; } to { transform: none; opacity: 1; } }

/* Reduced motion: the final state shows at once. No content depends on an animation. */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: 0ms !important; }
}