/* math.css — the Mathematics pages (js/math/). Everything lives under .mx, so nothing here reaches the rest of the site.
   Colours come only from tokens.css; the five hues arrive as --hue on the element that carries one. */
.mx{
  --mx-index:236px; --mx-side:336px; --mx-gap:28px;
  --mx-box:color-mix(in srgb, var(--bg) 78%, transparent);
  --mx-box-solid:color-mix(in srgb, var(--bg) 92%, var(--ink) 8%);
  --mx-rule:var(--line); --mx-soft:var(--line-soft);
  --burnt:#ec5c13; --coral:#F97079; --olympic:#2f5fd0; --pine:#009f4a; --lavender:#8a6fc0;
  position:absolute; inset:0; display:grid; grid-template-columns:var(--mx-index) minmax(0, 1fr); color:var(--ink); font-family:var(--font-sans);
}
html[data-mode="light"] .mx{ --mx-box:color-mix(in srgb, var(--bg) 84%, transparent); }
.mx ::selection{ background:var(--accent-soft); }

/* ── the index ─────────────────────────────────────────────────────────── */
.mx-index{ position:relative; display:flex; flex-direction:column; gap:22px; padding:26px 14px 92px 24px; overflow-y:auto; overscroll-behavior:contain; scrollbar-width:none; }
.mx-index::-webkit-scrollbar{ display:none; }
.mx-index .mx-home{ display:flex; flex-direction:column; gap:6px; }
.mx-index .mx-home b{ font:800 22px/1 var(--font-sans); letter-spacing:-.02em; }
.mx-index .mx-home span{ font:400 11.5px/1.45 var(--font-sans); color:var(--ink-muted); max-width:24ch; }
.mx-index .mx-home em{ font:500 13px/1 var(--font-sans); font-style:normal; letter-spacing:.02em; color:var(--ink-muted); margin-top:2px; }
.mx-group{ display:flex; flex-direction:column; gap:2px; }
.mx-group > h2{ margin:0 0 6px; font:400 9.5px/1 var(--font-mono); letter-spacing:.16em; text-transform:uppercase; color:var(--ink-faint); }
.mx-topic-link{ display:grid; grid-template-columns:22px 1fr; align-items:baseline; gap:4px; padding:6px 8px 6px 0; border-radius:8px; font:500 13.5px/1.3 var(--font-sans); color:var(--ink-muted); transition:color .25s var(--ease); }
.mx-topic-link i{ font:400 9.5px/1 var(--font-mono); font-style:normal; letter-spacing:.04em; color:var(--ink-faint); }
a.mx-topic-link:hover{ color:var(--ink); }
.mx-topic-link.on{ color:var(--ink); font-weight:700; }
.mx-topic-link.on i{ color:var(--burnt); }
.mx-sub{ display:flex; flex-direction:column; margin:4px 0 8px 26px; border-left:1px solid var(--mx-rule); }
.mx-sub a{ position:relative; display:flex; justify-content:space-between; gap:8px; padding:4px 0 4px 12px; font:400 10.5px/1.3 var(--font-mono); letter-spacing:.03em; color:var(--ink-faint); transition:color .2s var(--ease); }
.mx-sub a:hover{ color:var(--ink-muted); }
.mx-sub a.on{ color:var(--ink); }
.mx-sub a.on::before{ content:""; position:absolute; left:-1px; top:4px; bottom:4px; width:1px; background:var(--ink); }
.mx-sub a .nt{ width:5px; height:5px; border-radius:50%; background:var(--ink); align-self:center; flex:none; }

/* ── the scroll ────────────────────────────────────────────────────────── */
.mx-scroll{ position:relative; height:100%; overflow-y:auto; overflow-x:hidden; overscroll-behavior:contain; outline:none; scroll-behavior:auto;
  -webkit-mask-image:linear-gradient(to bottom, transparent 0, #000 22px, #000 calc(100% - 84px), transparent calc(100% - 10px)); mask-image:linear-gradient(to bottom, transparent 0, #000 22px, #000 calc(100% - 84px), transparent calc(100% - 10px)); }
.mx-bar{ display:none; }
.mx-loading{ margin:30vh 0 0; font:400 15px/1.5 var(--font-sans); color:var(--ink-muted); }
.mx-topic{ min-height:100%; }

/* a topic: the content, and the variables beside it */
.mx-t{ display:grid; grid-template-columns:minmax(0, 1fr) var(--mx-side); gap:var(--mx-gap); padding:26px 24px 0 0; }
.mx-main{ min-width:0; display:flex; flex-direction:column; gap:84px; padding-bottom:150px; }
.mx-side{ position:sticky; top:72px; align-self:start; max-height:calc(100vh - 72px - 90px); overflow-y:auto; overscroll-behavior:contain; scrollbar-width:thin; scrollbar-color:var(--line) transparent; padding:0 2px 8px 0; }

/* the head of a topic */
.mx-head{ display:grid; grid-template-columns:minmax(0, 1fr) 236px; column-gap:32px; row-gap:10px; align-items:end; }
.mx-head-a{ display:flex; flex-direction:column; gap:10px; min-width:0; }
.mx-head-b{ border-top:1px solid var(--mx-rule); padding-top:8px; line-height:1.7; }
.mx-head > .mx-note-slot{ grid-column:1 / -1; }
.mx-main > .mx-sec-spec{ margin-top:-56px; gap:14px; }
.mx-spec-cap{ max-width:none; }
.mx-kicker{ font:400 10.5px/1.3 var(--font-mono); letter-spacing:.14em; text-transform:uppercase; color:var(--ink-faint); display:flex; gap:10px; flex-wrap:wrap; }
.mx-kicker b{ font-weight:400; color:var(--burnt); }
.mx-head h1{ margin:0; font:800 clamp(40px, 4.4vw, 66px)/.95 var(--font-sans); letter-spacing:-.03em; }
.mx-latin{ margin:-2px 0 2px; font:400 17px/1.3 var(--font-sans); color:var(--ink-muted); letter-spacing:-.005em; }
.mx-latin i{ font-style:italic; color:var(--ink); }
.mx-lede{ margin:0; max-width:66ch; font:400 14px/1.6 var(--font-sans); color:var(--ink-muted); text-wrap:pretty; }
.mx-facts{ display:flex; flex-wrap:wrap; gap:4px 18px; margin:4px 0 0; padding:10px 0 0; border-top:1px solid var(--mx-rule); font:400 11px/1.4 var(--font-mono); letter-spacing:.02em; color:var(--ink-muted); font-variant-numeric:tabular-nums; }
.mx-facts span b{ font-weight:500; color:var(--ink); margin-right:6px; }

/* a section */
.mx-sec{ display:flex; flex-direction:column; gap:16px; scroll-margin-top:24px; }
.mx-sec-h{ display:grid; grid-template-columns:auto 1fr; column-gap:14px; row-gap:6px; align-items:baseline; border-top:1px solid var(--mx-rule); padding-top:14px; }
.mx-sec-h .no{ font:400 10.5px/1 var(--font-mono); letter-spacing:.12em; color:var(--ink-faint); }
.mx-sec-h h2{ margin:0; font:700 clamp(20px, 1.9vw, 26px)/1.1 var(--font-sans); letter-spacing:-.015em; }
.mx-sec-h p{ grid-column:2; margin:0; max-width:70ch; font:400 13.5px/1.6 var(--font-sans); color:var(--ink-muted); text-wrap:pretty; }
.mx-cap{ margin:0; font:400 10.5px/1.6 var(--font-mono); letter-spacing:.02em; color:var(--ink-faint); max-width:96ch; }
.mx-cap b{ font-weight:400; color:var(--ink-muted); }

/* the specimen and its boxes */
.mx-spec{ position:relative; }
.mx-spec > canvas.mx-c-spec{ display:block; width:100%; touch-action:pan-y; }
.mx-chrome{ position:absolute; left:0; right:0; top:0; display:flex; justify-content:space-between; align-items:flex-start; gap:10px; pointer-events:none; }
.mx-chrome > *{ pointer-events:auto; }
.mx-seg{ display:flex; gap:2px; padding:3px; border-radius:999px; border:1px solid var(--mx-rule); background:var(--mx-box); backdrop-filter:blur(8px); -webkit-backdrop-filter:blur(8px); font:400 10px/1 var(--font-mono); letter-spacing:.03em; }
.mx-seg button{ min-height:26px; padding:0 10px; border-radius:999px; color:var(--ink-muted); transition:background .25s var(--ease), color .25s var(--ease); }
.mx-seg button:hover{ color:var(--ink); }
.mx-seg button.on{ background:var(--ink-fill); color:var(--bg); }
.mx-seg button:focus-visible{ outline:1.5px solid var(--ink); outline-offset:1px; }
.mx-inset{ position:absolute; margin:0; width:178px; border:1px solid var(--mx-rule); border-radius:4px; background:var(--mx-box); backdrop-filter:blur(6px); -webkit-backdrop-filter:blur(6px); --hue:var(--olympic); }
.mx-inset::before, .mx-inset::after{ content:""; position:absolute; width:8px; height:8px; border:1px solid var(--hue); }
.mx-inset::before{ left:-4px; top:-4px; border-right:0; border-bottom:0; } .mx-inset::after{ right:-4px; bottom:-4px; border-left:0; border-top:0; }
.mx-inset canvas{ display:block; width:100%; height:132px; }
.mx-inset figcaption{ position:absolute; left:0; top:calc(100% + 7px); right:0; display:flex; justify-content:space-between; gap:8px; font:400 9.5px/1.2 var(--font-mono); letter-spacing:.08em; text-transform:uppercase; color:var(--ink-faint); white-space:nowrap; }
.mx-inset figcaption b{ font-weight:400; color:var(--ink-muted); text-transform:none; letter-spacing:.02em; }
.mx-inset.tl{ left:0; top:48px; } .mx-inset.tr{ right:0; top:48px; } .mx-inset.bl{ left:0; bottom:30px; } .mx-inset.br{ right:0; bottom:30px; }
/* a narrow specimen keeps its boxes in a row beneath it (four across, or two on a phone) */
.mx-spec.compact .mx-insets{ display:grid; grid-template-columns:repeat(4, minmax(0, 1fr)); gap:12px; margin-top:6px; padding-bottom:24px; }
.mx-spec.compact .mx-inset{ position:relative; left:auto; right:auto; top:auto; bottom:auto; width:auto; }
.mx-spec.compact .mx-inset canvas{ height:118px; }
.mx-spec.phone .mx-insets{ grid-template-columns:1fr 1fr; gap:34px 12px; }
.mx-spec.phone .mx-inset figcaption{ font-size:8.5px; }

/* dense data blocks under the specimen */
.mx-blocks{ display:grid; grid-template-columns:repeat(4, minmax(0, 1fr)); gap:0; border-top:1px solid var(--mx-rule); border-bottom:1px solid var(--mx-rule); }
.mx-block{ padding:12px 14px 14px 0; display:flex; flex-direction:column; gap:3px; min-width:0; }
.mx-block + .mx-block{ padding-left:14px; border-left:1px solid var(--mx-soft); }
.mx-block h3{ margin:0 0 6px; font:400 9.5px/1 var(--font-mono); letter-spacing:.16em; text-transform:uppercase; color:var(--ink-faint); display:flex; justify-content:space-between; }
.mx-block h3 i{ font-style:normal; width:6px; height:6px; border-radius:50%; background:var(--hue, var(--ink-faint)); align-self:center; }
.mx-kv{ display:grid; grid-template-columns:minmax(0, 1fr) auto; gap:10px; font:400 10.5px/1.75 var(--font-mono); letter-spacing:.01em; font-variant-numeric:tabular-nums; }
.mx-kv span{ color:var(--ink-muted); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.mx-kv b{ font-weight:400; color:var(--ink); text-align:right; white-space:nowrap; }
.mx-kv b small{ font-size:inherit; color:var(--ink-faint); margin-left:4px; }

/* equations: each variable lights while its control is touched */
.mx-eqs{ display:grid; grid-template-columns:minmax(0, 1fr) auto; column-gap:18px; row-gap:0; font:400 12.5px/1.5 var(--font-mono); letter-spacing:.01em; }
.mx-eqs > div{ padding:9px 0; border-bottom:1px solid var(--mx-soft); }
.mx-eqs .q{ color:var(--ink); overflow-x:auto; white-space:nowrap; scrollbar-width:none; }
.mx-eqs .q::-webkit-scrollbar{ display:none; }
.mx-eqs .n{ color:var(--ink-faint); font-size:10.5px; text-align:right; white-space:nowrap; align-self:center; }
.mx var{ font-style:normal; border-radius:3px; transition:color .2s var(--ease), background-color .2s var(--ease), box-shadow .2s var(--ease); }
.mx var.lit{ color:var(--hue); background:color-mix(in srgb, var(--hue) 14%, transparent); box-shadow:0 0 0 2px color-mix(in srgb, var(--hue) 14%, transparent); }
.mx sub, .mx sup{ font-size:.72em; line-height:0; }

/* figures: a canvas with a data column */
.mx-fig{ display:grid; grid-template-columns:minmax(0, 1fr) 210px; gap:22px; align-items:start; }
.mx-fig.wide{ grid-template-columns:minmax(0, 1fr); }
.mx-fig canvas{ display:block; width:100%; }
.mx-plot{ position:relative; border-top:1px solid var(--mx-rule); padding-top:10px; }
.mx-col{ display:flex; flex-direction:column; gap:14px; }
.mx-table{ width:100%; border-collapse:collapse; font:400 10.5px/1.6 var(--font-mono); font-variant-numeric:tabular-nums; }
.mx-table th{ font-weight:400; font-size:9.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-faint); text-align:right; padding:0 0 4px 8px; border-bottom:1px solid var(--mx-rule); }
.mx-table th:first-child, .mx-table td:first-child{ text-align:left; padding-left:0; }
.mx-table td{ text-align:right; padding:1px 0 1px 8px; color:var(--ink-muted); border-bottom:1px solid var(--mx-soft); white-space:nowrap; }
.mx-table tr.in td{ color:var(--ink); }
.mx-table tr.out td{ color:var(--ink-faint); }
.mx-table td.bar{ width:42%; }
.mx-table td.bar i{ display:block; height:5px; margin-left:auto; background:var(--hue, var(--ink)); border-radius:1px; }

/* the sensitivity matrix */
.mx-matrix{ width:100%; border-collapse:collapse; font:400 10.5px/1.4 var(--font-mono); font-variant-numeric:tabular-nums; }
.mx-matrix th{ font-weight:400; font-size:9.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-faint); text-align:right; padding:0 8px 6px; border-bottom:1px solid var(--mx-rule); vertical-align:bottom; }
.mx-matrix th:first-child{ text-align:left; padding-left:0; }
.mx-matrix td{ padding:6px 8px; border-bottom:1px solid var(--mx-soft); text-align:right; white-space:nowrap; color:var(--ink-muted); }
.mx-matrix td:first-child{ text-align:left; padding-left:0; color:var(--ink); }
.mx-matrix td:first-child i{ display:inline-block; width:6px; height:6px; border-radius:50%; background:var(--hue); margin-right:8px; vertical-align:1px; }
.mx-matrix td.e{ position:relative; color:var(--ink); }
.mx-matrix td.e::before{ content:""; position:absolute; inset:3px 2px; border-radius:3px; background:var(--cell, transparent); z-index:-1; }
.mx-matrix td.t{ text-align:left; color:var(--ink-faint); font-size:10px; white-space:normal; min-width:150px; line-height:1.45; }
.mx-matrix td.t .by{ color:var(--ink-muted); }
.mx-matrix tr.lit td:first-child{ color:var(--hue); }
.mx-matrix tr.lit td{ background:color-mix(in srgb, var(--hue) 7%, transparent); }
.mx-matrix-wrap{ overflow-x:auto; position:relative; z-index:0; }

/* Tanush's notes: shown only when he has written one; the page never waits for them */
.mx-note-slot:empty{ display:none; }
.mx-note{ position:relative; margin:4px 0 0; padding:16px 20px 16px 22px; border-left:2px solid var(--ink); background:color-mix(in srgb, var(--ink) 3.5%, transparent); border-radius:0 12px 12px 0; display:flex; flex-direction:column; gap:10px; max-width:72ch; }
.mx-note header{ display:flex; gap:10px; align-items:baseline; font:400 10px/1 var(--font-mono); letter-spacing:.14em; text-transform:uppercase; color:var(--ink-faint); }
.mx-note header b{ font-weight:500; color:var(--ink); letter-spacing:.08em; }
.mx-note p{ margin:0; font:400 15.5px/1.62 var(--font-sans); color:var(--ink); text-wrap:pretty; white-space:pre-line; }

/* sources */
.mx-sources{ margin:0; padding:0; list-style:none; counter-reset:src; display:grid; grid-template-columns:repeat(2, minmax(0, 1fr)); gap:10px 28px; }
.mx-sources li{ counter-increment:src; display:grid; grid-template-columns:26px 1fr; font:400 11px/1.55 var(--font-mono); letter-spacing:.01em; color:var(--ink-muted); }
.mx-sources li::before{ content:counter(src, decimal-leading-zero); color:var(--ink-faint); }
.mx-sources li b{ font-weight:400; color:var(--ink); }
.mx-sources li em{ font-style:normal; color:var(--ink-faint); }

/* ── the variables (the Panel's tiles, one setting to a row) ─────────────── */
.mx-vars{ display:flex; flex-direction:column; gap:6px; }
.mx-vars-h{ display:flex; justify-content:space-between; align-items:center; padding:2px 2px 8px; }
.mx-vars-h b{ font:400 9.5px/1 var(--font-mono); letter-spacing:.16em; text-transform:uppercase; color:var(--ink-faint); }
.mx-vars-h button{ font:400 10px/1 var(--font-mono); letter-spacing:.04em; color:var(--ink-muted); padding:7px 10px; border:1px solid var(--mx-rule); border-radius:999px; transition:color .2s var(--ease), border-color .2s var(--ease); }
.mx-vars-h button:hover{ color:var(--ink); border-color:var(--ink-faint); }
.mx-vgroup{ font:400 9.5px/1 var(--font-mono); letter-spacing:.16em; text-transform:uppercase; color:var(--ink-faint); padding:14px 2px 4px; }
.mx-var{ display:flex; flex-direction:column; gap:0; border-radius:16px; transition:box-shadow .25s var(--ease); }
.mx-var .mdl{ padding:0; gap:0; }
.mx-var .mdl-tile{ border-radius:16px 16px 0 0; }
.mx-var-note{ display:flex; flex-direction:column; gap:2px; padding:7px 16px 9px; border-radius:0 0 16px 16px; background:color-mix(in srgb, var(--ink) 3%, transparent); font:400 10px/1.45 var(--font-mono); letter-spacing:.01em; color:var(--ink-faint); font-variant-numeric:tabular-nums; }
html[data-mode="light"] .mx-var-note{ background:color-mix(in srgb, var(--ink) 2.2%, transparent); }
.mx-var-note .d{ color:var(--ink-faint); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.mx-var-note .s{ color:var(--ink-muted); }
.mx-var-note .s b{ font-weight:400; color:var(--ink); }
.mx-var.lit{ box-shadow:0 0 0 1px color-mix(in srgb, var(--hue) 55%, transparent); }
.mx-var.lit .mx-var-note .s b{ color:var(--hue); }

/* ── phones and narrow windows ──────────────────────────────────────────── */
@media (max-width:1180px){
  .mx{ --mx-index:200px; --mx-side:316px; --mx-gap:22px; }
  .mx-fig{ grid-template-columns:minmax(0, 1fr); }
  .mx-blocks{ grid-template-columns:repeat(2, minmax(0, 1fr)); }
  .mx-block:nth-child(3){ padding-left:0; border-left:0; border-top:1px solid var(--mx-soft); } .mx-block:nth-child(4){ border-top:1px solid var(--mx-soft); }
}
@media (max-width:900px){
  .mx{ grid-template-columns:minmax(0, 1fr); }
  .mx-index{ display:none; }
  .mx-scroll{ -webkit-mask-image:linear-gradient(to bottom, #000 0, #000 calc(100% - 84px), transparent calc(100% - 10px)); mask-image:linear-gradient(to bottom, #000 0, #000 calc(100% - 84px), transparent calc(100% - 10px)); }
  .mx-bar{ position:sticky; top:0; z-index:3; display:flex; align-items:center; gap:8px; padding:12px 16px 10px; background:linear-gradient(to bottom, var(--bg) 70%, transparent); }
  .mx-bar .mx-pick{ display:flex; align-items:center; gap:10px; min-height:40px; padding:0 14px 0 12px; border-radius:999px; border:1px solid var(--mx-rule); background:var(--mx-box); font:600 14px/1 var(--font-sans); }
  .mx-bar .mx-pick i{ font:400 10px/1 var(--font-mono); font-style:normal; color:var(--ink-faint); letter-spacing:.06em; }
  .mx-bar .mx-pick::after{ content:""; width:6px; height:6px; border-right:1.2px solid currentColor; border-bottom:1.2px solid currentColor; transform:rotate(45deg) translateY(-2px); margin-left:2px; }
  .mx-bar .mx-where{ font:400 10px/1.2 var(--font-mono); letter-spacing:.06em; color:var(--ink-faint); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
  .mx-menu{ position:absolute; left:16px; right:16px; top:58px; z-index:4; border-radius:18px; padding:12px 14px 14px; display:flex; flex-direction:column; gap:14px; max-height:70vh; overflow-y:auto; background:color-mix(in srgb, var(--bg) 96%, var(--ink) 4%) !important; }
  .mx-menu[hidden]{ display:none; }
  .mx-t{ grid-template-columns:minmax(0, 1fr); padding:6px 16px 130px; gap:40px; }
  .mx-main{ padding-bottom:0; }
  .mx-side{ position:static; max-height:none; overflow:visible; order:2; }
  .mx-main{ display:contents; }
  .mx-main > .mx-head{ order:0; } .mx-main > .mx-sec:first-of-type{ order:1; } .mx-main > *{ order:3; }
  .mx-main > .mx-sec{ margin-bottom:28px; }
  .mx-main > .mx-sec-spec{ margin-top:0; }
}
@media (max-width:640px){
  .mx-head{ grid-template-columns:minmax(0, 1fr); }
  .mx-head-b{ grid-template-columns:auto minmax(0, 1fr) auto minmax(0, 1fr); column-gap:10px; line-height:1.6; }
  .mx-head-b b{ text-align:left; }
  .mx-lede{ font-size:13.5px; }
  .mx-head h1{ font-size:44px; }
  .mx-spec{ display:flex; flex-direction:column; }
  .mx-chrome{ position:static; order:-1; flex-wrap:wrap; margin-bottom:6px; }
  .mx-blocks{ grid-template-columns:minmax(0, 1fr); }
  .mx-block + .mx-block{ padding-left:0; border-left:0; border-top:1px solid var(--mx-soft); }
  .mx-eqs{ grid-template-columns:minmax(0, 1fr); font-size:11.5px; } .mx-eqs .n{ text-align:left; padding-top:0; border-bottom:1px solid var(--mx-soft); }
  .mx-eqs .q{ border-bottom:0; padding-bottom:2px; }
  .mx-sources{ grid-template-columns:minmax(0, 1fr); }
  .mx-sec-h{ grid-template-columns:minmax(0, 1fr); } .mx-sec-h p{ grid-column:1; }
}
@media (prefers-reduced-motion:reduce){ .mx *{ transition:none !important; } }