:root {
  --bg: #0a0f1c;
  --panel: #111a2e;
  --line: #24314f;
  --fg: #d7deea;
  --muted: #8d9ab3;
  --accent: #7ee0c3;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "DejaVu Sans Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { background: var(--bg); color: var(--fg); }

body {
  margin: 0 auto;
  max-width: 1240px;
  padding: 0 clamp(8px, 3vw, 40px) 48px;
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
}

a { color: var(--accent); }
a:hover { color: #b4f2df; }
:focus-visible { outline: 3px solid #ffd479; outline-offset: 3px; border-radius: 4px; }
code, kbd { font-family: var(--mono); font-size: 0.9em; }

/* With JavaScript the page below is for screen readers only; the scene fills the screen. */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.top { padding: clamp(20px, 4vw, 44px) 0 18px; display: grid; gap: 10px; }
.top h1 { margin: 0; font: 700 clamp(30px, 5vw, 46px)/1.1 var(--mono); letter-spacing: 0.02em; }
.tagline { margin: 0; max-width: 70ch; color: var(--muted); font-size: clamp(15px, 1.4vw, 18px); }
.top nav { display: flex; flex-wrap: wrap; gap: 8px 10px; }
.top nav a {
  font-family: var(--mono); font-size: 14px; text-decoration: none;
  border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px; background: var(--panel);
}
.top nav a:hover { border-color: var(--accent); }

.stage {
  position: fixed; inset: 0;
  overflow: hidden;
  background: #060a14;
  cursor: crosshair;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.stage:focus-visible { outline: 2px solid rgba(126, 224, 195, 0.6); outline-offset: -2px; border-radius: 0; }
.stage.mapping { cursor: default; }

#scene { display: block; width: 100%; height: 100%; }

.card {
  position: absolute; left: 0; top: 0;
  width: min(340px, calc(100% - 16px));
  padding: 12px 14px;
  background: rgba(10, 15, 28, 0.92);
  border: 1px solid var(--accent);
  border-radius: 8px;
  font-size: 14px; line-height: 1.45;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
}
.card:empty { display: none; }
.card h3 { margin: 0 0 4px; font: 700 16px/1.3 var(--mono); }
.card p { margin: 0 0 6px; color: var(--fg); }
.card .hint { margin: 0; color: var(--muted); font-size: 12px; }
/* The intro sits in a corner; feature labels float by their object (harbor.js sets the position). */
.card.intro { top: auto; left: 12px; bottom: 12px; width: min(380px, calc(100% - 24px)); }
.card .links { display: flex; gap: 14px; margin: 6px 0 0; font-family: var(--mono); font-size: 13px; }

.pad {
  display: none;
  position: absolute; right: 10px; bottom: 10px;
  width: 84px; height: 84px; border-radius: 50%;
  border: 1px solid rgba(126, 224, 195, 0.35);
  background: rgba(10, 15, 28, 0.25);
}
.pad span {
  position: absolute; left: 50%; top: 50%;
  width: 32px; height: 32px; margin: -16px 0 0 -16px; border-radius: 50%;
  background: rgba(126, 224, 195, 0.4);
}
@media (pointer: coarse), (max-width: 700px) {
  .pad { display: block; }
  .card { padding: 8px 10px; font-size: 13px; width: min(280px, calc(100% - 16px)); }
  .card.intro { top: 8px; bottom: auto; width: calc(100% - 16px); }
  .card h3 { font-size: 14px; }
}

kbd {
  display: inline-block; min-width: 1.6em; padding: 0 4px; margin: 0 1px;
  border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px;
  background: var(--panel); color: var(--fg); text-align: center; line-height: 1.4;
}

.manifest { margin-top: 36px; }
.manifest h2 { font: 700 22px/1.2 var(--mono); margin: 0 0 14px; }
.manifest ul {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.manifest li { padding: 14px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.manifest li a { font: 700 16px/1.3 var(--mono); }
.manifest li p { margin: 6px 0 0; color: var(--muted); font-size: 14.5px; }

.foot { margin-top: 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }

/* how.html */
.how { max-width: 860px; padding-top: 20px; font-size: 15px; }
.how pre { margin: 0; color: var(--accent); font: 13px/1.25 var(--mono); overflow-x: auto; }
.how h1 { margin: 14px 0 10px; font: 700 22px/1.2 var(--mono); }
.how ul { padding-left: 18px; }
.how li { margin: 0 0 8px; color: var(--muted); }
.how b { color: var(--fg); }