/* WANDERERS homepage: astronomy editorial layout */
.home main { overflow-x: clip; }
.home section { max-width: var(--maxw); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
.home h2 { font: 700 clamp(1.7rem, 3.4vw, 2.75rem)/1.12 var(--f-display); letter-spacing: -.02em; margin: 10px 0 0; max-width: 24ch; text-wrap: balance; }
.home h3 { font: 700 1.12rem/1.3 var(--f-display); margin: 0 0 6px; }
.lede { color: var(--muted); font-size: 1.05rem; max-width: 60ch; margin: 16px 0 0; }

/* ---------- Hero ---------- */
.hero { padding-top: clamp(36px, 6vw, 80px); padding-bottom: 24px; position: relative; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr); gap: clamp(28px, 5vw, 72px); align-items: center; }
.hero-title { font: 800 clamp(3.1rem, 8.4vw, 7.6rem)/.9 var(--f-display); letter-spacing: -.045em; text-transform: uppercase;
  margin: 18px 0 26px; }
.hero-title .pt { color: var(--accent); }
.hero-lede { font: 500 clamp(1.1rem, 1.6vw, 1.32rem)/1.45 var(--f-ui); max-width: 34ch; margin: 0 0 12px; }
.hero-lede strong { font-weight: 600; }
.hero-sub { color: var(--muted); max-width: 52ch; margin: 0 0 28px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
/* Hero doors: three equal choices in the two-line style of the Sky Compass button, right under the lede so that
   they are above the fold on a 1280 x 720 laptop. One row from a 1024 px window (text column 470 px and up);
   they stack only on narrower columns (phones). Compact text while the doors are narrow. */
.hero-copy { container-type: inline-size; }
.hero .cta { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 22px 0 26px; }
.hero .cta .btn { min-height: 44px; padding: 9px 12px; gap: 10px; text-align: left; align-items: center; }
.hero .cta .cc-icon { width: 26px; height: 26px; flex: none; }
.hero .cta .cc-text { display: grid; gap: 3px; line-height: 1.15; }
.hero .cta .cc-text b { font-size: .95rem; }
.hero .cta .cc-text small { font: 500 .74rem/1.3 var(--f-ui); opacity: .85; }
@container (max-width: 660px) {
  .hero .cta { gap: 8px; }
  .hero .cta .btn { padding: 8px 9px; gap: 7px; }
  .hero .cta .cc-icon { width: 20px; height: 20px; }
  .hero .cta .cc-text b { font-size: .84rem; }
  .hero .cta .cc-text small { font-size: .68rem; }
}
@container (max-width: 469px) { .hero .cta { grid-template-columns: 1fr; } }
.hero-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 40px 0 0; border-top: 1px solid var(--line); }
.hero-stats div { padding: 14px 14px 0 0; border-right: 1px solid var(--line); margin-right: 14px; }
.hero-stats div:last-child { border-right: 0; margin-right: 0; }
.hero-stats dt { font: 500 .66rem/1.3 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.hero-stats dd { margin: 6px 0 0; font: 500 1.25rem/1.2 var(--f-mono); letter-spacing: -.01em; }

.hero-fig { margin: 0; }
.hero-fig figcaption { display: flex; gap: 10px; align-items: flex-start; margin-top: 12px; font-size: .82rem; color: var(--muted); }
.hero-fig figcaption b { color: var(--text); font-weight: 600; }

/* Observation viewer: always dark, imagery never recoloured */
.obs-frame { position: relative; background: var(--viewer); aspect-ratio: 1; border-radius: 4px; overflow: hidden;
  box-shadow: var(--shadow); isolation: isolate; }
.obs-frame canvas { position: absolute; inset: 0; width: 100%; height: 100%; image-rendering: pixelated; }
.obs-frame::after { content: ""; position: absolute; inset: 10px; pointer-events: none; z-index: 2;
  background:
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) top left / 18px 1px no-repeat,
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) top left / 1px 18px no-repeat,
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) top right / 18px 1px no-repeat,
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) top right / 1px 18px no-repeat,
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) bottom left / 18px 1px no-repeat,
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) bottom left / 1px 18px no-repeat,
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) bottom right / 18px 1px no-repeat,
    linear-gradient(var(--viewer-muted), var(--viewer-muted)) bottom right / 1px 18px no-repeat; opacity: .7; }
.obs-overlay { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }
.obs-overlay .trk { fill: none; stroke: #F2B866; stroke-width: 1.6; }
.obs-overlay .pt { fill: #F2B866; }
.obs-overlay .pt.old { fill-opacity: .55; }
.obs-overlay .ring { fill: none; stroke: #F2B866; stroke-width: 1; stroke-opacity: .7; }
.obs-overlay text { fill: #FFE6BF; font: 500 13px var(--f-mono); }
.obs-overlay .tick { stroke: var(--viewer-muted); stroke-width: 1; opacity: .55; }
.obs-overlay .tickl { fill: var(--viewer-muted); font-size: 10.5px; opacity: .85; }
.obs-stamp { position: absolute; z-index: 3; top: 18px; left: 18px; font-size: .74rem; color: var(--viewer-ink);
  background: rgba(5, 11, 20, .72); padding: 5px 9px; border-radius: 3px; letter-spacing: .02em; }
.obs-band { position: absolute; z-index: 3; top: 18px; right: 18px; font-size: .74rem; color: var(--viewer-muted); padding: 5px 0; }
.obs-pause { position: absolute; z-index: 3; bottom: 18px; right: 18px; font: 500 .72rem/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase;
  color: var(--viewer-ink); background: rgba(5, 11, 20, .72); border: 1px solid rgba(154, 176, 200, .4); border-radius: 3px; padding: 7px 10px; cursor: pointer; }
.obs-pause:hover { border-color: var(--viewer-ink); }
.obs-frame.small .obs-stamp { top: 12px; left: 12px; font-size: .68rem; }
.obs-frame.small::after { inset: 7px; }
.hero-coords { display: flex; justify-content: space-between; gap: 16px; margin-top: 48px; padding-top: 12px; border-top: 1px solid var(--line);
  font-size: .74rem; letter-spacing: .06em; color: var(--muted); flex-wrap: wrap; }

/* ---------- Chapters ---------- */
.chapter { padding-top: clamp(64px, 9vw, 128px); }
.chapter-head { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 24px; padding-top: 18px; border-top: 1px solid var(--text);
  margin-bottom: clamp(32px, 4vw, 56px); }
.chapter-no { font-size: .82rem; color: var(--accent); letter-spacing: .1em; padding-top: 2px; }
.chapter-no::before { content: "§ "; color: var(--muted); }

.two-up { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 3vw, 40px); margin-left: 144px; }
.concept-art { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 18px; margin-bottom: 20px; }
.concept-art svg { display: block; width: 100%; height: auto; }
.concept-art .tag-chip { position: absolute; top: 12px; right: 12px; background: var(--surface); }
.concept p { color: var(--muted); max-width: 52ch; margin: 0 0 10px; }
.concept .fact { color: var(--text); font-size: .84rem; border-left: 2px solid var(--accent); padding: 4px 0 4px 12px; margin-top: 14px; }
.concept .fact:empty { display: none; }
.grid-lines path { stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 4; }
.bg-stars circle { fill: var(--muted); opacity: .5; }
.traj { stroke: var(--accent); stroke-width: 1.2; stroke-dasharray: 4 4; fill: none; }
.curve { stroke: var(--accent-2); stroke-width: 1.6; fill: none; }
.epochs circle { fill: var(--accent); opacity: .5; }
.epochs circle.now { opacity: 1; }
.ann text { fill: var(--muted); font-size: 12px; }
.reveal .epochs circle { opacity: 0; transform-box: fill-box; transform-origin: center; transform: scale(.4);
  transition: opacity .5s ease calc(var(--d) * .18s), transform .5s ease calc(var(--d) * .18s); }
.reveal.in .epochs circle { opacity: .5; transform: none; }
.reveal.in .epochs circle.now { opacity: 1; }
.reveal .traj, .reveal .curve { stroke-dashoffset: 600; transition: stroke-dashoffset 1.2s ease; }
.reveal .curve { stroke-dasharray: 600; }
.reveal.in .traj { stroke-dashoffset: 0; }
.reveal.in .curve { stroke-dashoffset: 0; }

/* ---------- 02 Compare / timeline ---------- */
.compare { margin-left: 144px; }
.compare-views { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 780px; }
.compare-views figure { margin: 0; }
.compare-views figcaption { margin-top: 8px; font-size: .72rem; letter-spacing: .06em; color: var(--muted); }
.ring-key { display: inline-block; width: 10px; height: 10px; border: 1.5px solid #F2B866; border-radius: 50%; vertical-align: -1px; }
.timeline { margin-top: 28px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 18px 20px 14px; }
.tl-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.btn.tiny { padding: 8px 12px; font-size: .8rem; }
.btn.tiny[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.tl-axis { position: relative; height: 92px; margin: 14px 8px 0; }
.tl-axis .base { position: absolute; left: 0; right: 0; top: 40px; height: 1px; background: var(--line-strong); }
.tl-axis .gap { position: absolute; top: 34px; height: 13px; border-left: 1px dashed var(--line-strong); border-right: 1px dashed var(--line-strong);
  background: repeating-linear-gradient(90deg, transparent 0 6px, var(--accent-soft) 6px 8px); }
.tl-axis .gap span { position: absolute; top: -22px; left: 50%; transform: translateX(-50%); font: 400 .68rem var(--f-mono); color: var(--muted); white-space: nowrap; }
.tl-axis .yr { position: absolute; top: 56px; transform: translateX(-50%); font: 400 .68rem var(--f-mono); color: var(--muted); }
.tl-axis .yr::before { content: ""; position: absolute; left: 50%; top: -14px; height: 8px; border-left: 1px solid var(--line-strong); }
.tl-axis button { position: absolute; top: 40px; width: 18px; height: 18px; margin: -9px 0 0 -9px; border-radius: 50%; padding: 0; cursor: pointer;
  background: var(--surface); border: 2px solid var(--accent); transition: transform .2s, background-color .2s; }
.tl-axis button:hover { transform: scale(1.2); }
.tl-axis button[aria-pressed="true"] { background: var(--accent); transform: scale(1.25); }
.tl-axis button.cluster { width: 14px; height: 14px; margin: -7px 0 0 -7px; }
.tl-note { font: 400 .8rem/1.5 var(--f-mono); color: var(--muted); margin: 4px 0 0; min-height: 2.4em; }
.tl-note b { color: var(--text); font-weight: 500; }

/* ---------- 03 How ---------- */
.how-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(24px, 4vw, 56px); margin-left: 144px; }
.steps { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.steps li { display: grid; grid-template-columns: 44px 1fr; gap: 8px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.steps li:first-child { padding-top: 0; }
.steps li > span { color: var(--accent); font-size: .8rem; padding-top: 3px; }
.steps h3 { font-size: 1.02rem; margin: 0 0 4px; }
.steps p { margin: 0; color: var(--muted); font-size: .92rem; }
.evidence-demo { display: grid; gap: 16px; align-content: start; position: sticky; top: 84px; }
.ev-card, .spec-card { background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 18px 20px; box-shadow: var(--shadow); margin: 0; }
.ev-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 10px; }
.ev-name { font: 700 1.5rem/1.15 var(--f-display); margin: 4px 0 2px; letter-spacing: -.01em; }
.ev-cls { margin: 0; font-weight: 500; }
.ev-conf { font-size: .76rem; color: var(--known); margin: 8px 0 12px; letter-spacing: .02em; }
.ev-checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; font-size: .88rem; }
.ev-checks li { display: grid; grid-template-columns: 20px 1fr; gap: 6px; }
.ev-checks .ok { color: var(--known); } .ev-checks .no { color: var(--muted); } .ev-checks .warn { color: var(--cand); }
#miniSpec { width: 100%; height: auto; display: block; }
#miniSpec .ax { stroke: var(--line-strong); }
#miniSpec text { fill: var(--muted); font: 400 10.5px var(--f-mono); }
#miniSpec .ln { fill: none; stroke: var(--accent); stroke-width: 1.4; opacity: .6; }
#miniSpec .p { fill: var(--accent); }
#miniSpec .h2o { fill: var(--h2o); } #miniSpec .ch4 { fill: var(--ch4); } #miniSpec .co { fill: var(--co); }
.spec-card figcaption { font-size: .72rem; color: var(--muted); margin-top: 6px; }

/* ---------- 04 Targets ---------- */
.targets { list-style: none; margin: 0 0 0 144px; padding: 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.tcard { display: grid; grid-template-columns: 52px 148px minmax(0, 1.4fr) minmax(0, 1fr) 150px; gap: 24px; align-items: center;
  padding: 22px 0; border-bottom: 1px solid var(--line); text-decoration: none; color: inherit; position: relative; }
.tcard:hover .tname { color: var(--accent); }
.tcard .idx { font: 500 .8rem var(--f-mono); color: var(--muted); }
.tcard .thumb { width: 148px; aspect-ratio: 1; background: var(--viewer); border-radius: 3px; overflow: hidden; position: relative; }
.tcard .thumb img { width: 100%; height: 100%; display: block; image-rendering: pixelated; transition: transform .6s ease; }
.tcard:hover .thumb img { transform: scale(1.04); }
.tcard .tname, .tcard .tkind { display: block; }
.tcard .tname { font: 700 1.45rem/1.15 var(--f-display); letter-spacing: -.015em; margin: 0 0 4px; transition: color .2s; }
.tcard .tkind { color: var(--muted); margin: 0 0 10px; font-size: .92rem; }
.tcard .tcls { display: inline-flex; gap: 8px; align-items: center; font-size: .82rem; font-weight: 500; }
.tcard .tcls::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--known); }
.tcard dl { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 5px 14px; font-size: .8rem; }
.tcard dt { font: 400 .7rem/1.5 var(--f-mono); color: var(--muted); letter-spacing: .04em; text-transform: uppercase; }
.tcard dd { margin: 0; font: 500 .82rem/1.5 var(--f-mono); }
.tcard .go { justify-self: end; font: 600 .88rem var(--f-ui); color: var(--accent); white-space: nowrap; }
.tcard .go .arr { display: inline-block; transition: transform .2s; }
.tcard:hover .go .arr { transform: translateX(4px); }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(24px, 4vw, 64px); margin-left: 144px; }
.about-text p { font-size: 1.02rem; max-width: 56ch; margin: 0 0 16px; }
.about-text .cta { margin-top: 24px; }
.about h3.eyebrow { margin: 0 0 10px; font-weight: 500; font-size: .72rem; }
.sources { margin: 0 0 28px; display: grid; }
.sources div { display: grid; grid-template-columns: 170px 1fr; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: .88rem; }
.sources dt { font-weight: 600; }
.sources dd { margin: 0; color: var(--muted); }
.limits { margin: 0; padding-left: 18px; color: var(--muted); font-size: .9rem; display: grid; gap: 6px; }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .two-up, .compare, .how-grid, .targets, .about-grid { margin-left: 0; }
  .chapter-head { grid-template-columns: 1fr; gap: 6px; }
  .tcard { grid-template-columns: 40px 112px minmax(0, 1fr) minmax(0, 1fr); }
  .tcard .thumb { width: 112px; }
  .tcard .go { grid-column: 3 / -1; justify-self: start; }
}
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-fig { max-width: 560px; }
  .how-grid, .about-grid { grid-template-columns: 1fr; }
  .evidence-demo { position: static; }
  .two-up { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .hero-stats div:nth-child(2) { border-right: 0; margin-right: 0; }
  .compare-views { grid-template-columns: 1fr 1fr; gap: 8px; }
  .tcard { grid-template-columns: 88px minmax(0, 1fr); gap: 14px 16px; }
  .tcard .idx { display: none; }
  .tcard .thumb { width: 88px; }
  .tcard dl, .tcard .go { grid-column: 1 / -1; }
  .sources div { grid-template-columns: 1fr; gap: 2px; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal .epochs circle { opacity: .5; transform: none; }
  .reveal .epochs circle.now { opacity: 1; }
  .reveal .traj, .reveal .curve { stroke-dashoffset: 0; }
}

/* "Visualise with Sky Compass": compass icon + one line, centred */
.compass-cta { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 18px; line-height: 1.2; text-align: center; }
.compass-cta .cc-icon { width: 22px; height: 22px; flex: none; }
.compass-cta .cc-text { font-weight: 600; font-size: .95rem; }