/* Shared shell for the ported college algorithms (2021–2023).
   Same visual language as anamaya.fyi so the jump between them is not jarring,
   but each app is a standalone static deploy with no build step. */
:root{
  --bg:#fbfbfd;--raised:#fff;--sunken:#f5f5f7;
  --ink:#1d1d1f;--ink-2:#48484a;--ink-3:#86868b;
  --hair:rgba(0,0,0,.10);--hair-soft:rgba(0,0,0,.06);
  --accent:#0b66c3;--good:#23784f;--warn:#b8860b;--bad:#b23842;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","Inter","Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  color-scheme:light;
}
@media(prefers-color-scheme:dark){:root{
  --bg:#000;--raised:#1c1c1e;--sunken:#131315;
  --ink:#f5f5f7;--ink-2:#c7c7cc;--ink-3:#8e8e93;
  --hair:rgba(255,255,255,.14);--hair-soft:rgba(255,255,255,.08);
  --accent:#4ea3ff;--good:#41c98a;--warn:#e3b341;--bad:#ff6b6b;color-scheme:dark}}

*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:17px;line-height:1.55;letter-spacing:-.011em;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
h1,h2{margin:0;font-weight:630;letter-spacing:-.026em;line-height:1.07}
h1{font-size:clamp(1.9rem,4.6vw,2.9rem)}
h2{font-size:clamp(1.2rem,2.2vw,1.5rem)}
p{margin:0}
.muted{color:var(--ink-3)}
.small{font-size:.875rem;line-height:1.55}

.topbar{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 78%,transparent);
  -webkit-backdrop-filter:saturate(180%) blur(18px);backdrop-filter:saturate(180%) blur(18px);
  border-bottom:1px solid var(--hair-soft)}
.bar-in{max-width:940px;margin-inline:auto;padding:0 clamp(16px,4vw,28px);height:50px;
  display:flex;align-items:center;gap:12px}
.back{font-size:.9rem;color:var(--ink-2);margin-right:auto}
.back:hover{color:var(--ink);text-decoration:none}
.era{font-size:.72rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;
  color:var(--ink-3);border:1px solid var(--hair);padding:4px 10px;border-radius:980px}

.shell{max-width:940px;margin-inline:auto;
  padding:clamp(26px,5vw,48px) clamp(16px,4vw,28px) 76px;
  display:flex;flex-direction:column;gap:clamp(26px,4vw,42px)}
.lede{font-size:clamp(1rem,1.6vw,1.13rem);color:var(--ink-2);line-height:1.62;max-width:64ch}
.stack{display:flex;flex-direction:column;gap:14px}

.card{background:var(--raised);border:1px solid var(--hair-soft);border-radius:18px;
  padding:clamp(16px,3vw,24px);display:flex;flex-direction:column;gap:16px}

.controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;cursor:pointer;
  padding:9px 18px;border-radius:980px;font-size:.92rem;font-weight:500;font-family:inherit;
  background:var(--ink);color:var(--bg);border:1px solid var(--ink);
  transition:opacity .2s ease,transform .2s ease}
.btn:hover{opacity:.86;transform:translateY(-1px)}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}
.btn-secondary{background:transparent;color:var(--ink);border-color:var(--hair)}
.btn-secondary:hover{background:var(--hair-soft);opacity:1}

.field{display:flex;align-items:center;gap:9px;font-size:.9rem;color:var(--ink-2)}
.field input[type=range]{accent-color:var(--accent);width:clamp(90px,18vw,150px)}
.field input[type=number],.field select{font-family:inherit;font-size:.9rem;padding:6px 10px;
  border-radius:9px;border:1px solid var(--hair);background:var(--raised);color:var(--ink)}
.field .v{font-family:var(--mono);font-size:.85rem;color:var(--ink);min-width:2.5ch}

.stats{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(112px,1fr))}
.stat{border:1px solid var(--hair-soft);border-radius:13px;padding:13px 15px;background:var(--sunken)}
.stat .n{font-size:1.4rem;font-weight:640;letter-spacing:-.028em;font-variant-numeric:tabular-nums}
.stat .l{margin-top:4px;font-size:.78rem;color:var(--ink-3);line-height:1.35}

canvas{display:block;max-width:100%;border-radius:12px;background:var(--sunken)}
.canvas-wrap{display:flex;justify-content:center}

.credit{color:var(--ink-3);font-size:.86rem;line-height:1.65;
  border-top:1px solid var(--hair-soft);padding-top:20px}

.note{border-left:2px solid var(--hair);padding-left:16px;color:var(--ink-2);
  font-size:.92rem;line-height:1.65;max-width:64ch}

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