/* Frozen Star. One deliberate dark look: deep-space ink; the only bright colours are light itself,
   amber for the hot disk, blue for blueshift, red for redshift and danger. */
:root {
  --ink: #070812; --panel: #0f1120; --panel-2: #141729; --line: #23263d;
  --fg: #ece8f4; --muted: #9b98b4; --amber: #ffb45c; --amber-2: #ffc882;
  --blue: #8fb8ff; --red: #ff6b5c; --ok: #7fd6a8;
  --display: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --body: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --gutter: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--ink); color: var(--fg); }
body { font-family: var(--body); font-size: 15px; line-height: 1.55; min-height: 100vh; }
a { color: var(--amber-2); }
h1, h2, h3 { font-family: var(--display); text-wrap: balance; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.bar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: calc(10px + env(safe-area-inset-top, 0px)) var(--gutter-r) 10px var(--gutter); background: rgba(7, 8, 18, 0.82); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; font-family: var(--display); font-weight: 700; font-size: 18px; }
.mark { width: 18px; height: 18px; border-radius: 50%; background: radial-gradient(circle, #000 0 42%, var(--amber) 46%, rgba(255, 180, 92, 0) 72%); }
.bar nav { display: flex; gap: 18px; font-family: var(--mono); font-size: 13px; }
.bar nav a { color: var(--muted); text-decoration: none; }
.bar nav a:hover { color: var(--fg); }

.button, button, select { font: 500 13px var(--mono); color: var(--fg); background: var(--panel-2); border: 1px solid var(--line); border-radius: 7px; padding: 8px 14px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.button:hover, button:hover:not(:disabled) { border-color: #3a3e60; }
.button.primary, button.primary { background: var(--amber); color: #1d1206; border-color: var(--amber); }
button.send { background: rgba(127, 214, 168, 0.12); border-color: var(--ok); color: var(--ok); }
button:disabled { opacity: 0.4; cursor: default; }
input[type=range] { accent-color: var(--amber); width: 140px; }
input[type=checkbox] { accent-color: var(--amber); }

/* ---------- title ---------- */
.hero { position: relative; min-height: min(78vh, 720px); display: grid; align-items: end; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero-rt { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(7, 8, 18, 0) 40%, rgba(7, 8, 18, 0.92) 100%); pointer-events: none; }
.hero-text { position: relative; z-index: 1; display: grid; gap: 14px; max-width: 64ch; padding: 48px var(--gutter-r) 44px var(--gutter); margin: 0 auto 0 max(0px, calc((100vw - 1180px) / 2)); }
.eyebrow { font: 500 12px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--amber); }
.hero h1 { font-size: clamp(48px, 9vw, 104px); line-height: 0.92; font-weight: 700; }
.lede { font-size: 18px; color: #cdc9dc; max-width: 58ch; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 6px; }
.hero-actions .button { padding: 11px 18px; font-size: 14px; }

.chapters, .about { max-width: 1180px; margin: 0 auto; padding: 36px var(--gutter-r) 8px var(--gutter); }
.section-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 16px; }
.section-head h2 { font-size: 26px; }
.chapter-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.chapter-card { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--fg); text-decoration: none; height: 100%; align-content: start; }
.chapter-card:hover { border-color: rgba(255, 180, 92, 0.5); }
.chapter-card .num { grid-row: span 3; font: 500 28px var(--display); color: var(--amber); line-height: 1; }
.chapter-card b { font: 600 18px var(--display); }
.chapter-card .kick { color: var(--muted); font-size: 14px; }
.stars { display: inline-flex; gap: 4px; margin-top: 6px; }
.stars i { width: 10px; height: 10px; border-radius: 50%; border: 1.5px solid #4a4d6a; }
.stars i.on { background: var(--amber); border-color: var(--amber); box-shadow: 0 0 8px rgba(255, 180, 92, 0.6); }
.about { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; padding-bottom: 64px; }
.about h3 { font-size: 17px; margin-bottom: 6px; }
.about p { color: var(--muted); }

/* ---------- chapter frame ---------- */
.chapter { max-width: 1240px; margin: 0 auto; padding: 20px var(--gutter-r) 64px var(--gutter); display: grid; gap: 18px; }
.ch-head { display: grid; grid-template-columns: 1fr auto; gap: 8px 24px; align-items: end; }
.ch-head .back { grid-column: 1 / -1; font: 13px var(--mono); color: var(--muted); text-decoration: none; }
.ch-title { display: grid; gap: 4px; min-width: 0; }
.ch-title .num { font: 500 12px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--amber); }
.ch-title h2 { font-size: clamp(30px, 5vw, 46px); line-height: 1; }
.ch-title .kick { color: var(--muted); font-size: 16px; }
.goals { list-style: none; margin: 0; padding: 12px 14px; display: grid; gap: 6px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); font-size: 13.5px; min-width: 260px; }
.goals li { display: flex; gap: 10px; align-items: center; color: var(--muted); }
.goals li i { width: 11px; height: 11px; border-radius: 50%; border: 1.5px solid #4a4d6a; flex: none; }
.goals li.was i { border-color: var(--amber); }
.goals li.met { color: var(--fg); }
.goals li.met i { background: var(--amber); border-color: var(--amber); box-shadow: 0 0 8px rgba(255, 180, 92, 0.7); }
@media (max-width: 760px) { .ch-head { grid-template-columns: 1fr; } .goals { min-width: 0; } }
.ch-body { display: grid; gap: 14px; }

.controls { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.controls label, .slider { font: 12px var(--mono); color: var(--muted); display: inline-flex; gap: 8px; align-items: center; }
.slider output { color: var(--fg); min-width: 7ch; font-variant-numeric: tabular-nums; }
.check { cursor: pointer; }
.picks { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { padding: 5px 10px; font-size: 12px; border-radius: 999px; }
.chip[aria-pressed=true] { border-color: var(--amber); color: var(--amber-2); }
.best { font: 12px var(--mono); color: var(--muted); margin-left: auto; }
.best b { color: var(--ok); }

.bench { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.bench.wide-left { grid-template-columns: 1.6fr 1fr; }
@media (max-width: 860px) { .bench, .bench.wide-left { grid-template-columns: 1fr; } }
.view { display: grid; gap: 10px; align-content: start; min-width: 0; padding: 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.view-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.who { font: 500 12px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.fine { font: 12px var(--mono); color: var(--muted); }
canvas.field { width: 100%; aspect-ratio: 16 / 9; display: block; border-radius: 8px; }
canvas.diagram { width: 100%; height: clamp(280px, 42vw, 440px); display: block; border-radius: 8px; transition: filter 0.6s; }
canvas.plot { width: 100%; height: 300px; display: block; border-radius: 8px; }
canvas.figure { width: 100%; height: 160px; display: block; border-radius: 8px; }
canvas.timeline { width: 100%; height: 200px; display: block; border-radius: 8px; }
.clock { font: 500 28px/1.1 var(--mono); font-variant-numeric: tabular-nums; }
.clock small { display: block; font-size: 12.5px; color: var(--muted); font-weight: 400; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); gap: 8px 14px; font: 13px var(--mono); font-variant-numeric: tabular-nums; }
.stats.col { grid-template-columns: 1fr; }
.stat { display: grid; gap: 1px; min-width: 0; }
.stat span { color: var(--muted); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; }
.stat b { font-weight: 500; overflow-wrap: anywhere; }
.ok-t { color: var(--ok); } .bad-t { color: var(--red); } .warn-t { color: var(--amber); }
.status { font-size: 14px; padding: 8px 11px; border-radius: 6px; background: var(--ink); border-left: 3px solid var(--blue); min-height: 2.7em; }
.status.warn { border-color: var(--amber); } .status.bad { border-color: var(--red); } .status.done { border-color: var(--muted); } .status.good { border-color: var(--ok); }
.log { font: 12px var(--mono); color: var(--muted); display: grid; gap: 3px; max-height: 110px; overflow-y: auto; }
.log .got { color: var(--ok); } .log .never { color: var(--red); }

.quiz, .story { display: grid; gap: 10px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2); }
.story p { max-width: 75ch; }
.choices { display: flex; flex-wrap: wrap; gap: 8px; }
.choice { font-family: var(--body); font-size: 14px; text-align: left; max-width: 520px; }
.choice.picked { border-color: var(--amber); color: var(--amber-2); }
.choice.right { border-color: var(--ok); color: var(--ok); }
.choice.wrong { border-color: var(--red); color: var(--red); text-decoration: line-through; }

.viewport { position: relative; border-radius: 10px; overflow: hidden; background: #000; }
.viewport canvas.rt { width: 100%; aspect-ratio: 16 / 10; display: block; cursor: grab; }
.viewport.tall canvas.rt { aspect-ratio: auto; height: min(72vh, 680px); }
@media (max-width: 600px) { .viewport.tall canvas.rt { height: 62vh; } }
.no-gl { position: absolute; inset: 0; display: grid; place-content: center; gap: 6px; text-align: center; padding: 24px; color: var(--muted); }
.hud { position: absolute; left: 12px; bottom: 12px; display: grid; grid-template-columns: repeat(2, minmax(0, auto)); gap: 6px 18px; padding: 10px 12px; border-radius: 8px; background: rgba(7, 8, 18, 0.72); backdrop-filter: blur(4px); font: 12.5px var(--mono); pointer-events: none; max-width: calc(100% - 24px); }
.caption { position: absolute; left: 50%; top: 14px; transform: translateX(-50%); width: min(640px, calc(100% - 24px)); padding: 10px 14px; border-radius: 8px; background: rgba(7, 8, 18, 0.72); backdrop-filter: blur(4px); font-size: 15px; text-align: center; pointer-events: none; text-wrap: balance; }
@media (max-width: 600px) { .hud { grid-template-columns: 1fr; font-size: 11.5px; } .caption { font-size: 13.5px; } }

.debrief { display: grid; gap: 10px; padding: 22px; border: 1px solid rgba(255, 180, 92, 0.45); border-radius: 12px; background: linear-gradient(180deg, rgba(255, 180, 92, 0.07), rgba(255, 180, 92, 0)); }
.debrief h3 { font-size: 26px; }
.debrief p { max-width: 72ch; color: #d6d2e3; }
.debrief-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* Keep long control labels inside the phone width. */
.controls label, .slider { flex-wrap: wrap; max-width: 100%; min-width: 0; }
select { max-width: 100%; text-overflow: ellipsis; }
.chapter > *, .ch-body > * { min-width: 0; }

/* ---------- game main menu ---------- */
body.fs-menu .bar { display: none; }
.menu-screen { position: fixed; inset: 0; overflow: hidden; display: grid; align-items: center; }
.menu-screen .hero-rt { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.menu-screen::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,8,18,.92) 0%, rgba(7,8,18,.7) 32%, rgba(7,8,18,0) 62%); pointer-events: none; }
.menu-left { position: relative; z-index: 1; display: grid; gap: 14px; width: min(460px, calc(100% - 32px)); margin-left: max(16px, min(9vw, 120px)); padding-block: 32px; }
.menu-left h1 { font-size: clamp(54px, 9vw, 104px); line-height: .9; font-weight: 700; }
.menu-left .lede { font-size: 17px; color: #cfcbdd; }
.menu-items { display: grid; gap: 6px; margin-top: 10px; }
.menu-item, .menu-panel .menu-item { display: grid; justify-items: start; gap: 1px; width: 100%; padding: 11px 16px; border-radius: 9px; background: rgba(15,17,32,.55); border: 1px solid rgba(255,255,255,.08); text-align: left; font-family: var(--body); transition: background .15s, border-color .15s, transform .15s; }
.menu-item b { font: 600 18px var(--display); color: var(--fg); }
.menu-item span { font-size: 13px; color: var(--muted); }
.menu-item:hover, .menu-item:focus-visible { background: rgba(255,180,92,.12); border-color: rgba(255,180,92,.55); transform: translateX(4px); outline: none; }
.menu-item.primary { background: rgba(255,180,92,.92); border-color: var(--amber); }
.menu-item.primary b, .menu-item.primary span { color: #1d1206; }
.menu-item.primary:hover, .menu-item.primary:focus-visible { background: var(--amber); }
.menu-foot { margin-top: 6px; }
.menu-panel { position: absolute; z-index: 2; right: max(16px, 6vw); top: 50%; transform: translateY(-50%); width: min(400px, calc(100% - 32px)); max-height: calc(100% - 48px); overflow-y: auto; padding: 18px; border-radius: 14px; background: rgba(12,14,28,.95); border: 1px solid var(--line); display: grid; gap: 10px; }
.menu-panel .fp-settings { display: grid; gap: 10px; }
@media (max-width: 760px) {
  .menu-screen::after { background: linear-gradient(180deg, rgba(7,8,18,.2) 0%, rgba(7,8,18,.85) 55%); }
  .menu-left { align-self: end; margin-inline: 16px; }
  .menu-left h1 { font-size: 56px; }
  .menu-panel { left: 16px; right: 16px; width: auto; top: auto; bottom: 16px; transform: none; }
}
.chapters .back { font: 13px var(--mono); color: var(--muted); text-decoration: none; display: inline-block; margin-bottom: 14px; }
.menu-left { width: min(560px, calc(100% - 32px)); max-height: 100%; overflow-y: auto; }
.menu-left h1 { white-space: nowrap; font-size: clamp(48px, 6.6vw, 88px); }
.menu-items { max-width: 460px; }
@media (max-height: 780px) { .menu-left .lede { display: none; } .menu-left { gap: 10px; } .menu-item { padding: 8px 14px; } .menu-item b { font-size: 16.5px; } }