@font-face{font-family:"Fraunces";font-style:normal;font-weight:300 800;font-display:swap;src:url("fonts/fraunces-normal-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Fraunces";font-style:normal;font-weight:300 800;font-display:swap;src:url("fonts/fraunces-normal-latin-ext.woff2") format("woff2");unicode-range:U+0100-02AF,U+0304,U+0308,U+0329,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:300 700;font-display:swap;src:url("fonts/IBMPlexSans-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:300 700;font-display:swap;src:url("fonts/IBMPlexSans-latin-ext.woff2") format("woff2");unicode-range:U+0100-02AF,U+0304,U+0308,U+0329,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* Two themes from one set of tokens: a graphite night for the drawing, drafting paper by day.
   Damage rings run hot to cool, A (demolished) to D (repairable), legible on both. */
:root{
  color-scheme:dark;
  --bg:#0d0e0d;--surface:#151715;--surface-2:#1d201d;--card:#121412;
  --ink:#eeeae1;--ink-2:#dcd6ca;--muted:#bab3a5;--line:#30332f;--line-soft:#262825;
  --accent:#ffa552;--accent-ink:#1c0f02;--steel:#9cc3db;--rock:#2a2620;--rock-2:#221f1a;--rock-line:#3c362d;--sky:#0d0e0d;
  --cA:#ff5f45;--cB:#ff8a3d;--cCB:#ffb347;--cCA:#e9d27c;--cD:#b9c79a;
  --house:#6f6a60;--tnt:#e8a23c;--plate-b:#e6dfd2;--plate-r:#575b56;--plate-w:#24425a;--plate-p:#1f2b1f;
  --serif:"Fraunces","Iowan Old Style",Georgia,serif;--sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --topbar:46px;--to-top-bg:#0d0e0d;--to-top-fg:#eeeae1;
}
:root[data-theme="light"]{
  color-scheme:light;
  --bg:#f2eee5;--surface:#fbf8f1;--surface-2:#e9e3d6;--card:#fbf8f1;
  --ink:#171612;--ink-2:#2c2a24;--muted:#4a463d;--line:#d2c9b7;--line-soft:#e2dbcc;
  --accent:#9c3d08;--accent-ink:#fff8ee;--steel:#1d5677;--rock:#d8cdb8;--rock-2:#cdbfa6;--rock-line:#b9a98d;--sky:#f2eee5;
  --cA:#b3230e;--cB:#c4520c;--cCB:#a8700a;--cCA:#7d7413;--cD:#4f6a2c;
  --house:#8d8576;--tnt:#b86d0c;--plate-b:#2c2a24;--plate-r:#b8ae9b;--plate-w:#9fbdd0;--plate-p:#cfd8bd;
  --to-top-bg:#f2eee5;--to-top-fg:#171612;
}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]){color-scheme:light;
  --bg:#f2eee5;--surface:#fbf8f1;--surface-2:#e9e3d6;--card:#fbf8f1;
  --ink:#171612;--ink-2:#2c2a24;--muted:#4a463d;--line:#d2c9b7;--line-soft:#e2dbcc;
  --accent:#9c3d08;--accent-ink:#fff8ee;--steel:#1d5677;--rock:#d8cdb8;--rock-2:#cdbfa6;--rock-line:#b9a98d;--sky:#f2eee5;
  --cA:#b3230e;--cB:#c4520c;--cCB:#a8700a;--cCA:#7d7413;--cD:#4f6a2c;
  --house:#8d8576;--tnt:#b86d0c;--plate-b:#2c2a24;--plate-r:#b8ae9b;--plate-w:#9fbdd0;--plate-p:#cfd8bd;
  --to-top-bg:#f2eee5;--to-top-fg:#171612}}

*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
svg[hidden]{display:none}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--topbar) + 12px)}
body{margin:0;background:var(--bg);color:var(--ink);font:400 18px/1.62 var(--sans);font-feature-settings:"tnum" 0}
a{color:var(--accent);text-underline-offset:.18em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.num{font-variant-numeric:tabular-nums}
.skip-link{position:absolute;left:-9999px;top:8px;z-index:100;background:var(--surface);color:var(--ink);padding:8px 14px;border-radius:8px}
.skip-link:focus{left:12px}

/* ---------- top bar: one line, quiet, takes the stage's colour while the story runs */
.topbar{position:fixed;inset:0 0 auto 0;height:var(--topbar);z-index:40;display:flex;align-items:center;gap:6px;padding:0 max(12px,env(safe-area-inset-right)) 0 max(12px,env(safe-area-inset-left));background:var(--bg);border-bottom:1px solid var(--line-soft)}
html.in-story .topbar{border-bottom-color:transparent}
.brand{display:flex;align-items:center;gap:8px;color:var(--ink);text-decoration:none;font:600 15px/1 var(--serif);white-space:nowrap}
.brand-mark{width:18px;height:18px;border-radius:50%;border:1.5px solid var(--accent);position:relative;flex:none}
.brand-mark::after{content:"";position:absolute;inset:4px;border-radius:50%;background:var(--accent)}
.topnav{display:none;gap:2px;margin-left:14px}
.topnav a{color:var(--ink-2);text-decoration:none;font-size:14px;padding:6px 9px;border-radius:7px}
.topnav a:hover{background:var(--surface-2)}
html.in-story .topnav{visibility:hidden}
@media (min-width:880px){.topnav{display:flex}}
.spacer{flex:1}
.chips{display:flex;gap:2px}
.chip{font:600 12.5px/1 var(--sans);letter-spacing:.04em;color:var(--muted);text-decoration:none;padding:7px 8px;border-radius:7px;min-width:34px;text-align:center}
.chip[aria-current="page"]{color:var(--ink);background:var(--surface-2)}
.icon-btn{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;border:0;background:transparent;color:var(--ink);cursor:pointer}
.icon-btn:hover{background:var(--surface-2)}
.progress{position:absolute;left:0;bottom:-1px;height:2px;width:100%;transform-origin:0 50%;transform:scaleX(0);background:var(--accent);pointer-events:none}

/* ---------- rail: a hairline of dots at the far edge, after the opening */
.rail{position:fixed;right:6px;top:50%;transform:translateY(-50%);z-index:30;display:none;flex-direction:column;opacity:0;transition:opacity .4s}
html.scrolled .rail{opacity:1}
@media (min-width:1180px){.rail{display:flex}}
.rail a{display:flex;align-items:center;justify-content:flex-end;gap:8px;padding:3px 3px;text-decoration:none;font-size:12.5px;color:var(--ink-2)}
.rail .dot{width:5px;height:5px;border-radius:50%;background:currentColor;opacity:.42;flex:none;transition:transform .2s}
.rail a[aria-current="true"] .dot{opacity:1;transform:scale(1.6);background:var(--accent)}
.rail .rail-label{opacity:0;transform:translateX(6px);transition:opacity .2s,transform .2s;background:var(--surface);color:var(--ink);padding:2px 8px;border-radius:6px;border:1px solid var(--line);white-space:nowrap}
.rail a:hover .rail-label,.rail a:focus-visible .rail-label{opacity:1;transform:none}

/* ---------- the story: a sticky drawing, text cards scrolling past it */
.story{position:relative}
.stage{position:sticky;top:0;height:100vh;height:100svh;z-index:0;overflow:hidden;background:var(--sky)}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.stage .readout{position:absolute;right:16px;bottom:14px;margin:0;font:500 13.5px/1.45 var(--sans);color:var(--muted);text-align:right;pointer-events:none;max-width:60%}
.stage .replay{position:absolute;right:14px;top:calc(var(--topbar) + 10px);display:none}
.stage.can-replay .replay{display:inline-flex}
.steps{position:relative;z-index:1;margin-top:-100vh;margin-top:-100svh}
.step{min-height:100vh;min-height:100svh;display:flex;align-items:center;padding:calc(var(--topbar) + 24px) 0 32px max(24px,4vw)}
.card{width:min(440px,92vw);background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px 24px 20px;box-shadow:0 10px 40px rgba(0,0,0,.18)}
.kicker{margin:0 0 8px;font:600 12.5px/1.3 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.16;letter-spacing:-.005em;color:var(--ink)}
h1{font-size:clamp(30px,4.2vw,46px);margin:0 0 14px}
h2{font-size:clamp(23px,2.5vw,29px);margin:0 0 12px}
h3{font-size:20px;margin:26px 0 8px}
.card p{margin:0 0 12px;color:var(--ink-2);font-size:17px}
.card p:last-child{margin-bottom:0}
.deck{font-size:18.5px!important;color:var(--ink)!important}
.hint{font-size:14.5px!important;color:var(--muted)!important}
.hero{min-height:100vh;min-height:100svh}
.hero .card{width:min(560px,92vw)}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 12px}
.btn{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:10px 18px;border-radius:999px;border:1px solid var(--line);background:transparent;color:var(--ink);font:600 15px/1.2 var(--sans);text-decoration:none;cursor:pointer}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.anchor{margin-left:.35em;font-size:.6em;color:var(--muted);text-decoration:none;opacity:0;vertical-align:.25em}
h2:hover .anchor,.anchor:focus-visible{opacity:1}
.houses{list-style:none;margin:6px 0 14px;padding:0;font-size:15.5px}
.houses li{display:grid;grid-template-columns:14px 92px 1fr;gap:8px;align-items:baseline;padding:4px 0;border-bottom:1px solid var(--line-soft);color:var(--ink-2)}
.houses li:last-child{border-bottom:0}
.houses .sw{width:12px;height:12px;border-radius:50%;align-self:center}
.houses b{font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums;white-space:nowrap}
.sw.cA{background:var(--cA)}.sw.cB{background:var(--cB)}.sw.cCB{background:var(--cCB)}.sw.cCA{background:var(--cCA)}.sw.cD{background:var(--cD)}

/* phone: the drawing is a band under the top bar and the text keeps more than half the screen */
@media (max-width:899px){
  .stage{top:var(--topbar);height:40vh;height:40svh;border-bottom:1px solid var(--line);z-index:3}
  .stage .readout{font-size:12px;right:10px;bottom:8px}
  .steps{margin-top:0}
  .step{min-height:78vh;min-height:78svh;align-items:flex-start;padding:28px 14px 28px}
  .hero{min-height:auto;padding-top:20px}
  .card{width:100%;padding:18px 18px 16px;box-shadow:none}
  .story{padding-bottom:20vh}
}

/* ---------- after the story: reading column */
.after{position:relative;z-index:2;background:var(--bg);border-top:1px solid var(--line)}
.free{max-width:1080px;margin:0 auto;padding:56px 20px 10px}
.prose{max-width:680px;margin:0 auto;padding:0 20px}
.prose p,.free>p{color:var(--ink-2)}
.block{padding:30px 0 10px}
.block h2{font-size:clamp(25px,3vw,32px)}
figure{margin:22px 0}
figure img{display:block;width:100%;height:auto;border-radius:10px;background:var(--surface-2)}
figcaption{margin-top:8px;font-size:14.5px;line-height:1.5;color:var(--muted)}
figcaption .cr{display:block;font-size:13px;margin-top:2px}
.figrow{display:grid;grid-template-columns:1fr;gap:14px}
@media (min-width:720px){.figrow.two{grid-template-columns:1.5fr 1fr}}
.sources{padding-left:1.1em;font-size:15px;line-height:1.5}
.sources li{margin:0 0 8px;color:var(--ink-2)}
.related{border-left:3px solid var(--accent);padding:4px 0 4px 14px}

/* ---------- squares */
.rings-wrap{display:grid;grid-template-columns:1fr;gap:20px;align-items:start}
@media (min-width:960px){.rings-wrap{grid-template-columns:minmax(0,1fr) 340px}}
.plate{position:relative;width:100%;max-width:640px;aspect-ratio:1;margin:0 auto}
.plate canvas{width:100%;height:100%;display:block;border-radius:50%;cursor:default;touch-action:pan-y}
.plate .loading{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);font-size:14px}
.squares{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 14px}
.sq{min-height:40px;padding:8px 13px;border-radius:999px;border:1px solid var(--line);background:transparent;color:var(--ink);font:500 14.5px/1.2 var(--sans);cursor:pointer}
.sq[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.legend{list-style:none;margin:0;padding:0;font-size:15px}
.legend li{display:grid;grid-template-columns:14px 1fr auto;gap:10px;align-items:center;padding:6px 0;border-bottom:1px solid var(--line-soft);color:var(--ink-2)}
.legend .n{font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}
.result{font-size:16.5px;color:var(--ink);margin:14px 0 6px}
.note{font-size:13.5px;color:var(--muted)}

/* ---------- share row: compact icon buttons */
.share{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:14px 0 4px}
.share-label{font-size:14px;color:var(--muted)}
.share-row{display:flex;gap:6px}
.sbtn{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;border:1px solid var(--line-soft);background:transparent;color:var(--ink);cursor:pointer;text-decoration:none}
.sbtn:hover,.sbtn:focus-visible{color:var(--accent);border-color:var(--accent)}
@media (pointer:coarse){.sbtn{width:44px;height:44px}}
.share-msg{min-height:1.4em;font-size:14px;color:var(--muted);margin:2px 0}

/* ---------- quiz */
.quiz{max-width:680px;margin:0 auto;padding:0 20px}
.qcard{border:1px solid var(--line);border-radius:14px;padding:18px 20px;background:var(--surface)}
.qround{font:600 20px/1.3 var(--serif);margin:0 0 12px;color:var(--ink)}
.qopts{display:flex;gap:10px;flex-wrap:wrap}
.qfeed{min-height:2.8em;margin:12px 0 0;color:var(--ink-2)}
.qbar{display:flex;gap:4px;margin:0 0 12px}
.qbar i{flex:1;height:4px;border-radius:2px;background:var(--line)}
.qbar i.ok{background:var(--cD)}.qbar i.no{background:var(--cA)}.qbar i.now{background:var(--accent)}

.site-footer{display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:center;padding:40px 20px 60px;font-size:14px;color:var(--muted)}
.site-footer a{color:var(--ink-2)}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.rail,.rail .dot,.rail-label{transition:none}}
@media print{.stage,.topbar,.rail,.share,.qcard{display:none}.steps{margin:0}.card{border:0;box-shadow:none}}