/* DSort. Every colour is declared once here as a ROLE, never a value.
   Dark mode below redefines only these lines. */
:root {
  --paper:      #f7f3ec;
  --card:       #ffffff;
  --card-alt:   #fbf8f3;
  --ink:        #241f1a;
  --ink-soft:   #6b6156;
  --ink-faint:  #9a9086;
  --line:       #e3dbcf;
  --accent:     #b4531f;   /* the "do it" colour */
  --accent-ink: #ffffff;
  --accent-bg:  #fbeee5;
  --gold:       #b8860b;
  --silver:     #7d8790;
  --bronze:     #9c6438;
  --good:       #2f6b4a;
  --warn:       #9a5b12;
  --shadow:     0 1px 2px rgba(36,31,26,.06), 0 8px 24px rgba(36,31,26,.06);
  --shadow-lift:0 2px 6px rgba(36,31,26,.10), 0 18px 40px rgba(36,31,26,.13);
  --r:          14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper:     #17140f;
    --card:      #221e18;
    --card-alt:  #1c1913;
    --ink:       #f0e9df;
    --ink-soft:  #b3a695;
    --ink-faint: #7d7263;
    --line:      #362f26;
    --accent:    #e8843f;
    --accent-ink:#1a1510;
    --accent-bg: #2c2118;
    --gold:      #e0b64a;
    --silver:    #b3bcc4;
    --bronze:    #cd8f5c;
    --good:      #6fc194;
    --warn:      #e0a74e;
    --shadow:    0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
    --shadow-lift:0 2px 6px rgba(0,0,0,.5), 0 18px 40px rgba(0,0,0,.45);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 ui-sans-serif, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}
h1, h2, h3 { margin: 0; line-height: 1.2; font-weight: 620; letter-spacing: -.02em; }
p { margin: 0; }
button { font: inherit; color: inherit; }

/* ---------- layout ---------- */
.wrap { max-width: 820px; margin: 0 auto; padding: 24px 18px 96px; }
.wrap.wide { max-width: 1100px; }
.stack { display: grid; gap: 14px; }
.stack.lg { gap: 24px; }
.stack.sm { gap: 8px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.spacer { flex: 1; }

.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 18px; max-width: 1100px; margin: 0 auto;
}
.brand { font-weight: 700; letter-spacing: -.03em; font-size: 20px; display: flex; align-items: baseline; gap: 8px; cursor: pointer; }
.brand span { color: var(--accent); }
.brand small { font-weight: 500; font-size: 12px; color: var(--ink-faint); letter-spacing: 0; }

/* ---------- cards ---------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r); padding: 18px; box-shadow: var(--shadow);
}
.card.flat { box-shadow: none; background: var(--card-alt); }
.muted { color: var(--ink-soft); }
.faint { color: var(--ink-faint); }
.tiny { font-size: 13px; }
.mono { font-variant-numeric: tabular-nums; }

/* ---------- buttons ---------- */
.btn {
  appearance: none; border: 1px solid var(--line); background: var(--card);
  padding: 11px 16px; border-radius: 10px; cursor: pointer; font-weight: 560;
  transition: transform .06s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { box-shadow: var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--ink-soft); }
.btn.ghost:hover { background: var(--card-alt); box-shadow: none; }
.btn.danger:hover { color: #c0392b; border-color: #c0392b; }
.btn.big { padding: 14px 22px; font-size: 17px; border-radius: 12px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------- forms ---------- */
label.field { display: grid; gap: 6px; font-size: 14px; font-weight: 560; color: var(--ink-soft); }
input[type=text], textarea, select {
  font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; width: 100%;
}
textarea { min-height: 190px; resize: vertical; line-height: 1.7; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px; }
.opt {
  border: 1px solid var(--line); background: var(--card); border-radius: 12px;
  padding: 12px 14px; cursor: pointer; display: grid; gap: 3px; text-align: left;
}
.opt:hover { border-color: var(--accent); }
.opt.on { border-color: var(--accent); background: var(--accent-bg); box-shadow: inset 0 0 0 1px var(--accent); }
.opt b { font-weight: 620; }
.opt em { font-style: normal; font-size: 12.5px; color: var(--ink-soft); line-height: 1.4; }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--card); }
.seg button { border: 0; background: transparent; padding: 9px 15px; cursor: pointer; font-weight: 560; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on { background: var(--accent); color: var(--accent-ink); }

.toggle { display: flex; gap: 12px; align-items: flex-start; cursor: pointer; padding: 10px 0; }
.toggle input { margin: 3px 0 0; width: 18px; height: 18px; accent-color: var(--accent); flex: none; }
.toggle div { display: grid; gap: 2px; }
.toggle b { font-weight: 560; }

/* ---------- example templates ---------- */
.chips { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.chip {
  display: flex; align-items: center; gap: 11px; text-align: left; cursor: pointer;
  border: 1px solid var(--line); background: var(--card-alt); border-radius: 11px;
  padding: 10px 13px; transition: border-color .15s, background .15s;
}
.chip:hover { border-color: var(--accent); background: var(--card); }
.chip .e { font-size: 19px; line-height: 1; flex: none; }
.chip span span, .chip > span:last-child { display: grid; gap: 1px; min-width: 0; }
.chip b { font-weight: 580; font-size: 14px; }
.chip em {
  font-style: normal; font-size: 12px; color: var(--ink-faint); line-height: 1.35;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* ---------- session list ---------- */
.sess {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--card);
  text-align: left; width: 100%; cursor: pointer;
}
.sess:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.sess .grow { flex: 1; min-width: 0; display: grid; gap: 3px; }
.sess .name { font-weight: 620; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pill {
  font-size: 11.5px; font-weight: 620; letter-spacing: .04em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px; background: var(--card-alt);
  border: 1px solid var(--line); color: var(--ink-soft); white-space: nowrap;
}
.pill.live { background: var(--accent-bg); border-color: var(--accent); color: var(--accent); }
.pill.done { background: transparent; color: var(--good); border-color: var(--good); }

/* ---------- the arena (the actual comparison) ---------- */
.arena-page { min-height: 100dvh; display: flex; flex-direction: column; }
.arena-head { padding: 14px 18px 4px; max-width: 1100px; margin: 0 auto; width: 100%; }
.progress { height: 7px; border-radius: 99px; background: var(--line); overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .3s ease; }

.arena {
  flex: 1; display: grid; grid-template-columns: 1fr auto 1fr;
  gap: 14px; align-items: center; padding: 12px 18px;
  max-width: 1100px; margin: 0 auto; width: 100%;
}
.pick {
  border: 2px solid var(--line); background: var(--card); border-radius: 20px;
  padding: 22px 18px; cursor: pointer; display: flex; flex-direction: column;
  align-items: center; justify-content: space-between; gap: 14px; text-align: center;
  min-height: min(46vh, 360px); transition: transform .08s ease, border-color .15s, box-shadow .2s;
}
.pick .mid { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; }
.pick:hover { border-color: var(--accent); box-shadow: var(--shadow-lift); transform: translateY(-2px); }
.pick:active { transform: translateY(0) scale(.99); }
.pick .hand {
  font-size: 11.5px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-faint); font-weight: 620;
}
.pick .nm { font-size: clamp(24px, 4.6vw, 40px); font-weight: 660; letter-spacing: -.03em; overflow-wrap: anywhere; }
.pick .key { font-size: 12px; color: var(--ink-faint); }
.pick .tally { display: flex; gap: 5px; }
.dot { width: 9px; height: 9px; border-radius: 99px; background: var(--line); }
.dot.won { background: var(--accent); }
.vs { align-self: center; color: var(--ink-faint); font-weight: 620; font-size: 13px; letter-spacing: .1em; }
.arena-foot { padding: 8px 18px 26px; max-width: 1100px; margin: 0 auto; width: 100%; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

@media (max-width: 620px) {
  .arena { grid-template-columns: 1fr 1fr; gap: 10px; padding: 10px; align-items: stretch; }
  .vs { display: none; }
  .pick { min-height: 52vh; padding: 18px 10px; border-radius: 16px; }
  .pick .key { display: none; }
}

/* ---------- results ---------- */
.rank { display: grid; gap: 8px; }
.rank-row {
  display: flex; align-items: center; gap: 14px; padding: 13px 16px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--card);
}
.rank-row .pos {
  width: 30px; text-align: center; font-weight: 700; font-size: 17px;
  color: var(--ink-faint); font-variant-numeric: tabular-nums; flex: none;
}
.rank-row .nm { flex: 1; font-weight: 560; overflow-wrap: anywhere; }
.rank-row.p1 { border-color: var(--gold); background: var(--card); box-shadow: inset 3px 0 0 var(--gold); }
.rank-row.p1 .pos, .rank-row.p1 .nm { color: var(--gold); font-weight: 700; }
.rank-row.p2 { box-shadow: inset 3px 0 0 var(--silver); }
.rank-row.p2 .pos { color: var(--silver); }
.rank-row.p3 { box-shadow: inset 3px 0 0 var(--bronze); }
.rank-row.p3 .pos { color: var(--bronze); }
.rank-row.last { box-shadow: inset 3px 0 0 var(--line); }

.tier-head {
  display: flex; align-items: center; gap: 10px; margin: 20px 0 6px;
  font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint);
}
.tier-head:first-child { margin-top: 0; }
.tier-head::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; }
.stat { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; background: var(--card-alt); }
.stat b { display: block; font-size: 26px; font-weight: 680; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.stat span { font-size: 12.5px; color: var(--ink-soft); }

.close-call { display: flex; gap: 10px; align-items: baseline; padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: 14px; }
.close-call:last-child { border-bottom: 0; }

.banner { border-left: 3px solid var(--accent); background: var(--accent-bg); padding: 12px 16px; border-radius: 0 10px 10px 0; font-size: 14.5px; }
.banner.quiet { border-color: var(--line); background: var(--card-alt); color: var(--ink-soft); }

/* save status */
.save {
  display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px;
  color: var(--ink-faint); white-space: nowrap;
}
.save i { width: 7px; height: 7px; border-radius: 99px; background: currentColor; flex: none; }
.save.ok { color: var(--good); }
.save.warn { color: var(--ink-faint); }
.save.bad { color: #c0392b; }

.empty { text-align: center; padding: 46px 20px; color: var(--ink-soft); }
.empty h2 { margin-bottom: 10px; color: var(--ink); }

@media print {
  .noprint { display: none !important; }
  body { background: #fff; }
  .card, .rank-row { box-shadow: none; }
}

/* ---------- prose / maths page ---------- */
.prose { max-width: 720px; }
.prose h1 { font-size: clamp(28px, 5vw, 38px); margin-bottom: 6px; }
.prose h2 {
  font-size: 19px; margin: 42px 0 10px; padding-top: 18px;
  border-top: 1px solid var(--line);
}
.prose p { margin: 0 0 14px; }
.prose .lede { font-size: 17px; color: var(--ink-soft); margin-bottom: 8px; }
.prose ol, .prose ul { margin: 0 0 14px; padding-left: 22px; }
.prose li { margin-bottom: 8px; }
.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .89em;
  background: var(--card-alt); border: 1px solid var(--line);
  padding: 1px 5px; border-radius: 5px;
}
.prose a, .lnk { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
a.brand { text-decoration: none; color: inherit; }

.formula {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 18px; text-align: center; padding: 16px;
  background: var(--card-alt); border-radius: 10px; border: 1px solid var(--line);
}
.quote {
  border-left: 3px solid var(--accent); padding: 4px 0 4px 16px;
  color: var(--ink); font-size: 15.5px;
}
.panel {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  padding: 18px; margin: 0 0 18px; display: grid; gap: 14px;
}
.note { font-size: 13.5px; color: var(--ink-soft); margin: 0 !important; }

.slider { display: grid; gap: 8px; font-size: 14px; font-weight: 560; color: var(--ink-soft); }
.slider b { color: var(--accent); font-size: 17px; }
.slider input[type=range] { width: 100%; accent-color: var(--accent); }

.figures { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; }
.fig { background: var(--card-alt); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.fig b { display: block; font-size: 22px; font-weight: 680; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.fig span { font-size: 12.5px; color: var(--ink-soft); }

.halving { display: grid; grid-template-columns: repeat(16, 1fr); gap: 4px; }
.halving i { aspect-ratio: 1; border-radius: 3px; background: var(--accent); transition: background .3s, opacity .3s; }
.halving i.dead { background: var(--line); opacity: .45; }

.tablewrap { overflow-x: auto; }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; }
.prose th, .prose td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); }
.prose th { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-faint); font-weight: 620; }
.prose tr:last-child td { border-bottom: 0; }
.verdict { font-size: 12.5px; font-weight: 560; }
.verdict.good { color: var(--good); }
.verdict.warnish { color: var(--warn); }

.tag {
  display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; padding: 2px 8px; border-radius: 999px;
  border: 1px solid currentColor; white-space: nowrap;
}
.tag.floor { color: var(--good); }
.tag.proven { color: var(--accent); }
.tag.best { color: var(--ink-faint); }
.key { list-style: none; padding: 0; display: grid; gap: 8px; font-size: 13.5px; color: var(--ink-soft); }
.key li { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: start; margin: 0; }

.jacob { display: grid; gap: 7px; }
.jrow { display: grid; grid-template-columns: 34px minmax(30px, 120px) 1fr; gap: 10px; align-items: center; }
.jn { font-variant-numeric: tabular-nums; font-weight: 680; color: var(--accent); text-align: right; }
.jbar { height: 9px; background: var(--accent); border-radius: 99px; opacity: .55; }

.refs { font-size: 13.5px; color: var(--ink-soft); }
.foot { margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--line); }

.sitefoot {
  max-width: 820px; margin: 0 auto; padding: 28px 18px 40px;
  border-top: 1px solid var(--line); display: flex; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: var(--ink-faint);
}

@media (max-width: 560px) {
  .brand small { display: none; }
  .topbar { padding: 14px; }
  .prose .lede { font-size: 16px; }
}