@font-face { font-family: Anta; src: url('fonts/Anta-Regular.ttf') format('truetype'); font-weight: 400; font-style: normal; font-display: swap; }
:root { color-scheme: dark; --bg: #07100a; --surface: #0e1812; --text: #f4eee1; --muted: #a9b3aa; --line: #2b382e; --purple: #bd8cff; --gold: #f4c675; --display: Anta, sans-serif; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, sans-serif; }
button, input, select { font: inherit; }
button, select, a, input { -webkit-tap-highlight-color: transparent; }
button, select { color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; opacity: .45; }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, summary:focus-visible { outline: 2px solid var(--gold); outline-offset: 5px; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; top: -70px; left: 20px; padding: 12px; background: var(--text); color: var(--bg); z-index: 10; }
.skip-link:focus { top: 10px; }
.page-shell { max-width: 1500px; padding: 0 clamp(18px,4.5vw,72px); margin: auto; }
.masthead { min-height: 102px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.wordmark { font: 22px/1.2 var(--display); text-decoration: none; }
.wordmark span { display: block; font: 10px/1.4 system-ui,sans-serif; text-transform: uppercase; letter-spacing: .17em; color: var(--muted); margin-top: 7px; }
.back-link { font-size: 12px; color: var(--muted); text-decoration: none; }
.back-link span { color: var(--purple); padding-left: 12px; }
.intro { display: flex; justify-content: space-between; align-items: end; gap: 32px; padding: 38px 0 32px; }
.eyebrow { margin: 0 0 10px; color: var(--muted); font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: .17em; }
h1 { margin: 0; font: clamp(48px,6.7vw,90px)/1.03 var(--display); letter-spacing: -.04em; }
.title-dot { color: var(--purple); }
.intro-note { margin: 0 0 6px; color: var(--muted); font-size: 13px; line-height: 1.8; }
.explorer { border: 1px solid var(--line); background: var(--surface); }
.explorer-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 18px; border-bottom: 1px solid var(--line); padding: 0 22px; min-height: 72px; }
.type-controls { display: flex; align-self: stretch; gap: 26px; }
.type-controls button { border: 0; border-bottom: 3px solid transparent; background: none; color: var(--muted); padding: 19px 0 16px; font: 17px var(--display); }
.type-controls button[aria-pressed='true'] { color: var(--text); border-bottom-color: var(--purple); }
.type-controls span { padding-left: 7px; font: 11px system-ui,sans-serif; color: var(--muted); }
.game-control { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 11px; }
.game-control select { min-height: 40px; max-width: 235px; background: transparent; border: 1px solid var(--line); border-radius: 0; padding: 8px 28px 8px 12px; color: var(--text); font-size: 12px; }
.game-control option { background: var(--surface); }
.explorer-body { display: grid; grid-template-columns: minmax(0,1fr) 300px; }
.visual-column { min-width: 0; }
.stage { height: clamp(380px,39vw,560px); position: relative; overflow: hidden; background: var(--bg); isolation: isolate; }
.stage-heading { display: flex; justify-content: space-between; gap: 15px; padding: 20px 24px; position: absolute; left: 0; top: 0; width: 100%; pointer-events: none; z-index: 2; font: 12px var(--display); }
.stage-mode { color: var(--muted); font: 10px/1.5 system-ui,sans-serif; text-transform: uppercase; letter-spacing: .08em; }
#scene-host, #flight-preview { display: block; position: absolute; inset: 0; width: 100%; height: 100%; }
#scene-host canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.load-panel { position: absolute; z-index: 3; left: 0; bottom: 30px; width: 100%; text-align: center; pointer-events: none; }
.load-button { pointer-events: auto; border: 1px solid var(--purple); background: var(--purple); color: #140922; padding: 13px 21px; font: 15px var(--display); }
.load-button:hover { background: #d4b0ff; }
.load-button span { padding-right: 12px; }
.load-panel p { font-size: 11px; color: var(--muted); margin: 12px 10px 0; }
.view-controls { display: flex; justify-content: center; gap: 2px; position: absolute; z-index: 3; bottom: 18px; left: 50%; transform: translateX(-50%); border: 1px solid #536058; padding: 3px; background: #07100ae8; }
.view-controls button { padding: 8px 13px; min-height: 38px; border: 0; color: var(--muted); background: transparent; font-size: 11px; }
.view-controls button[aria-pressed='true'] { background: #334038; color: var(--text); }
.scene-notice { position: absolute; left: 24px; right: 24px; bottom: 20px; z-index: 4; padding: 12px 16px; border: 1px solid var(--line); background: #0e1812f5; font-size: 12px; color: var(--text); }
.legend { display: flex; flex-wrap: wrap; gap: 12px 23px; padding: 13px 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; min-height: 44px; }
.legend-item { display: flex; align-items: center; gap: 8px; }
.color-line { display: inline-block; width: 19px; height: 3px; background: var(--game-color); flex-shrink: 0; }
.transport { display: flex; gap: 14px; padding: 16px 24px; align-items: center; border-top: 1px solid var(--line); }
.transport button { min-height: 40px; border: 1px solid var(--line); background: transparent; padding: 8px 12px; white-space: nowrap; font-size: 12px; }
.play-button span { font-size: 10px; padding-right: 5px; }
.scrub-control { flex: 1; min-width: 35px; display: flex; }
input[type=range] { width: 100%; accent-color: var(--purple); cursor: pointer; min-height: 30px; margin: 0; }
.transport output { color: var(--muted); min-width: 89px; font-size: 10px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.flight-rail { border-left: 1px solid var(--line); padding: 22px; display: flex; flex-direction: column; }
.rail-heading { display: flex; justify-content: space-between; align-items: center; padding-bottom: 15px; }
.rail-heading h3 { margin: 0; font: 18px var(--display); }
.rail-heading span { color: var(--muted); font-size: 10px; }
.flight-list { padding-bottom: 20px; }
.flight-group { margin: 0 0 17px; }
.flight-group h4 { display: flex; justify-content: space-between; gap: 8px; font-size: 10px; font-weight: 500; color: var(--muted); margin: 0 0 7px; }
.flight-group h4 time { white-space: nowrap; }
.flight-item { display: grid; grid-template-columns: 4px 1fr auto; gap: 10px; width: 100%; align-items: center; padding: 11px 9px; text-align: left; border: 1px solid transparent; border-top-color: var(--line); background: none; }
.flight-item .flight-swatch { width: 3px; height: 25px; background: var(--game-color); }
.flight-item[aria-pressed='true'] { border-color: #657565; background: #203027; }
.flight-item:hover { background: #1b271f; }
.flight-item-label { font-size: 12px; }
.flight-item-label small { color: var(--muted); font-size: 10px; display: block; }
.flight-item-distance { font: 21px var(--display); }
.flight-item-distance small { font: 10px system-ui,sans-serif; color: var(--muted); }
.selected-flight { margin-top: auto; padding-top: 21px; border-top: 1px solid var(--line); }
.selected-flight h3 { margin: 0; font: 23px var(--display); }
.measurements { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 18px 0 12px; }
.measurements dt { min-height: 28px; font-size: 10px; color: var(--muted); }
.measurements dd { margin: 0; font: 31px var(--display); white-space: nowrap; }
.measurements dd small { font: 12px system-ui,sans-serif; color: var(--muted); }
.result-line { font-size: 12px; color: var(--purple); margin: 7px 0; }
.flight-definition { font-size: 11px; color: var(--muted); line-height: 1.6; margin: 8px 0 0; }
.method-note { display: flex; gap: 20px; justify-content: space-between; align-items: start; border-top: 1px solid var(--line); padding: 17px 22px; font-size: 11px; color: var(--muted); }
.method-note>p { max-width: 62%; margin: 0; }
.method-note details { max-width: 45%; }
.method-note summary { color: var(--text); cursor: pointer; white-space: nowrap; }
.method-note details p { margin: 12px 0 0; }
.loading-text, .no-script { color: var(--muted); font-size: 12px; }
.no-script { padding: 15px 22px; }
footer { display: flex; justify-content: space-between; gap: 20px; padding: 28px 0 34px; color: var(--muted); font-size: 11px; }
footer a { color: var(--text); text-decoration: none; }
footer a span { color: var(--purple); padding-left: 10px; }
@media(min-width:1500px) { .stage { height: 565px; } }
@media(max-width:1000px) { .explorer-body { grid-template-columns: minmax(0,1fr) 255px; } .flight-rail { padding: 18px; } .stage { height: 470px; } .stage-heading { padding: 18px; } .stage-mode { max-width: 95px; text-align: right; } .transport { gap: 9px; padding: 14px 17px; } .next-button { font-size: 0 !important; } .next-button span { font-size: 16px; } }
@media(max-width:760px) {
    .page-shell { padding: 0 18px; }
    .masthead { min-height: 86px; gap: 12px; }
    .wordmark { font-size: 19px; }
    .wordmark span { font-size: 8px; letter-spacing: .13em; }
    .back-link { font-size: 10px; }
    .back-link span { padding-left: 4px; }
    .intro { display: block; padding: 29px 0 26px; }
    .intro-note { font-size: 12px; line-height: 1.65; margin: 14px 0 0; }
    .intro-note br { display: none; }
    .explorer-toolbar { flex-wrap: wrap; padding: 0 16px 13px; gap: 7px; }
    .type-controls { gap: 24px; width: 100%; min-height: 58px; }
    .type-controls button { padding: 15px 0 12px; font-size: 17px; }
    .game-control { width: 100%; justify-content: space-between; }
    .game-control select { flex: 1; max-width: 240px; }
    .explorer-body { grid-template-columns: 1fr; }
    .stage { height: clamp(360px,108vw,500px); }
    .stage-heading { font-size: 11px; padding: 17px; }
    .stage-mode { max-width: none; font-size: 9px; }
    .legend { padding: 12px 16px; gap: 8px 17px; font-size: 10px; }
    .transport { padding: 12px 15px; gap: 9px; }
    .transport output { font-size: 9px; min-width: 77px; }
    .transport button { padding: 8px 10px; }
    .flight-rail { border-left: 0; border-top: 1px solid var(--line); padding: 22px 18px; }
    .flight-list { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; padding-bottom: 7px; }
    .flight-group h4 { flex-wrap: wrap; gap: 0 8px; }
    .flight-item { padding: 11px 5px; gap: 7px; }
    .flight-item-distance { font-size: 19px; }
    .selected-flight { padding-top: 19px; }
    .measurements { max-width: 330px; }
    .method-note { display: block; padding: 17px; }
    .method-note>p, .method-note details { max-width: none; }
    .method-note details { margin-top: 12px; }
    footer { font-size: 10px; padding-bottom: 25px; }
}
@media(max-width:370px) { .page-shell { padding: 0 12px; } .back-link { max-width: 74px; } .flight-list { display: block; } .stage-mode { max-width: 95px; } }
@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } }