/* Visual essay: notebook (light) and blackboard (dark). Data colours are the site's validated palette (style.css);
   the paper, chalk, highlighter and pen colours are decoration only and never encode data. */
:root {
  color-scheme: light;
  --paper: #f7f3e8; --paper-2: #fffdf6; --paper-3: #efe9da; --rule: rgba(42, 91, 215, 0.10); --margin-line: rgba(216, 69, 47, 0.28);
  --ink: #1d1b17; --ink-2: #4d4a42; --muted: #8a8578; --line: #ddd6c4; --axis: #c3bca9;
  --hl: rgba(255, 214, 51, 0.62); --pen: #2a5bd7; --marker: #d8452f; --note: #fff4b8; --note-ink: #4a3f12;
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100; --s5: #e87ba4; --s6: #008300; --s7: #6250d6; --s8: #e34948;
  --good: #0ca30c; --warning: #fab219; --serious: #ec835a; --critical: #d03b3b; --pending: #c9c4b4;
  --neutral-mark: #b8b2a2; --card-shadow: 0 1px 0 rgba(0,0,0,.04), 0 10px 30px rgba(60, 50, 20, .07);
  --f-display: "Fraunces", Georgia, serif; --f-body: "IBM Plex Sans Arabic", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-hand: "Caveat", "Comic Sans MS", cursive; --f-ar: "Lalezar", "IBM Plex Sans Arabic", sans-serif;
}
@media (prefers-color-scheme: dark) { :root:where(:not([data-theme="light"])) {
  color-scheme: dark;
  --paper: #16201c; --paper-2: #1c2823; --paper-3: #223029; --rule: rgba(236, 233, 223, 0.045); --margin-line: rgba(232, 120, 100, 0.22);
  --ink: #ece9df; --ink-2: #c4c1b5; --muted: #8f9a92; --line: #2f3d36; --axis: #44534b;
  --hl: rgba(255, 214, 51, 0.30); --pen: #8fb1ff; --marker: #ff8a70; --note: #2b3a2f; --note-ink: #f3e7a4;
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767;
  --pending: #3d4a43; --neutral-mark: #56645c; --card-shadow: none;
} }
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #16201c; --paper-2: #1c2823; --paper-3: #223029; --rule: rgba(236, 233, 223, 0.045); --margin-line: rgba(232, 120, 100, 0.22);
  --ink: #ece9df; --ink-2: #c4c1b5; --muted: #8f9a92; --line: #2f3d36; --axis: #44534b;
  --hl: rgba(255, 214, 51, 0.30); --pen: #8fb1ff; --marker: #ff8a70; --note: #2b3a2f; --note-ink: #f3e7a4;
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767;
  --pending: #3d4a43; --neutral-mark: #56645c; --card-shadow: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
body {
  margin: 0; color: var(--ink); font: 17px/1.7 var(--f-body); -webkit-font-smoothing: antialiased;
  background-color: var(--paper);
  background-image: linear-gradient(var(--rule) 1px, transparent 1px), linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 28px 28px;
}
a { color: var(--pen); text-underline-offset: 3px; }
.col { max-width: 720px; margin: 0 auto; padding: 0 16px; }
.wide { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 760px) { .col, .wide { padding: 0 28px; } }
.ar { font-family: var(--f-ar); direction: rtl; unicode-bidi: isolate; letter-spacing: 0; }
.hl { background: linear-gradient(104deg, transparent 0.6%, var(--hl) 2.4%, var(--hl) 97%, transparent 99%); padding: 0 .18em; border-radius: .25em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.pen { color: var(--pen); font-weight: 600; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* top bar */
.bar { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--paper) 90%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.bar .in { display: flex; align-items: center; gap: 12px; height: 54px; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.bar .logo { font-family: var(--f-display); font-weight: 700; color: var(--ink); text-decoration: none; white-space: nowrap; font-size: 17px; }
.bar .logo span { font-family: var(--f-ar); font-weight: 400; color: var(--marker); margin-inline-start: 6px; }
.bar .prog { flex: 1; height: 4px; background: var(--paper-3); border-radius: 4px; overflow: hidden; min-width: 40px; }
.bar .prog i { display: block; height: 100%; width: 0; background: var(--marker); border-radius: 4px; }
.bar a.btn, .bar button { font: 500 13px var(--f-body); color: var(--ink-2); background: var(--paper-2); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; cursor: pointer; text-decoration: none; white-space: nowrap; }
@media (max-width: 520px) { .bar .hide-s { display: none; } }

/* hero */
.hero { padding: 64px 0 40px; position: relative; overflow: hidden; }
.hero .eyebrow { font: 600 13px var(--f-body); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 0 0 18px; }
.hero h1 { font-family: var(--f-display); font-weight: 800; font-size: clamp(40px, 8.4vw, 86px); line-height: .98; letter-spacing: -0.035em; margin: 0; font-variation-settings: "SOFT" 100, "WONK" 1; }
.hero h1 .ar { display: block; font-size: .62em; color: var(--marker); margin-top: 14px; line-height: 1.3; }
.hero .lede { font-size: clamp(18px, 2.3vw, 22px); color: var(--ink-2); margin: 26px 0 0; max-width: 34em; }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 34px 0 0; }
@media (min-width: 640px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stat { background: var(--paper-2); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; box-shadow: var(--card-shadow); }
.stat b { display: block; font: 700 clamp(26px, 4vw, 34px)/1.1 var(--f-display); font-variant-numeric: tabular-nums; }
.stat span { font-size: 13px; color: var(--ink-2); line-height: 1.35; display: block; }
.scrollcue { margin-top: 30px; font: 600 22px var(--f-hand); color: var(--marker); display: inline-flex; align-items: center; gap: 8px; }
.scrollcue svg { animation: bob 1.8s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(5px); } }

/* players strip (the seven layers) */
.players { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 22px 0 6px; }
@media (min-width: 640px) { .players { grid-template-columns: repeat(8, 1fr); } }
.player { text-align: center; background: var(--paper-2); border: 1px solid var(--line); border-radius: 12px; padding: 10px 4px 8px; font-size: 13px; line-height: 1.25; }
.player svg { width: 28px; height: 28px; display: block; margin: 0 auto 4px; color: var(--ink); }
.player .ar { display: block; font-size: 13px; color: var(--muted); margin-top: 2px; }

/* chapters */
.chapter { padding: 72px 0 24px; position: relative; }
.ch-head { margin-bottom: 18px; }
.ch-num { display: flex; align-items: baseline; gap: 12px; margin-bottom: 4px; }
.ch-num .n { font: 800 clamp(54px, 9vw, 92px)/.9 var(--f-display); color: transparent; -webkit-text-stroke: 1.6px var(--ink); letter-spacing: -0.04em; }
.ch-num .ar { font-size: clamp(20px, 3vw, 28px); color: var(--marker); }
.chapter h2 { font: 750 clamp(30px, 5vw, 46px)/1.05 var(--f-display); letter-spacing: -0.025em; margin: 6px 0 14px; }
.chapter p { margin: 0 0 16px; }
.chapter .lede { font-size: clamp(18px, 2.1vw, 20px); color: var(--ink-2); }
.big-claim { font: 650 clamp(22px, 3.2vw, 28px)/1.3 var(--f-display); letter-spacing: -0.01em; margin: 26px 0 18px; }

/* figure cards */
.fig { background: var(--paper-2); border: 1px solid var(--line); border-radius: 18px; padding: 18px 16px 14px; margin: 24px 0; box-shadow: var(--card-shadow); position: relative; }
@media (min-width: 760px) { .fig { padding: 22px 24px 18px; } }
.fig h3 { font: 700 19px/1.3 var(--f-display); margin: 0 0 4px; }
.fig .sub { font-size: 14px; color: var(--ink-2); margin: 0 0 12px; line-height: 1.5; }
.fig .chart { width: 100%; position: relative; }
.fig .chart svg { display: block; overflow: visible; }
.fig .foot { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; margin-top: 10px; font-size: 12.5px; color: var(--muted); }
.legend { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 13px; color: var(--ink-2); margin: 8px 0 0; }
.legend i { display: inline-block; width: 11px; height: 11px; border-radius: 3px; margin-inline-end: 6px; vertical-align: -1px; }
.ctl { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 12px; }
.ctl button, .ctl select { font: 500 13.5px var(--f-body); color: var(--ink-2); background: var(--paper); border: 1px solid var(--line); border-radius: 999px; padding: 6px 13px; cursor: pointer; min-height: 34px; }
.ctl select { border-radius: 10px; max-width: 100%; }
.ctl button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.ctl button:focus-visible, .ctl select:focus-visible, summary:focus-visible, .cell:focus-visible, .chip:focus-visible { outline: 2px solid var(--pen); outline-offset: 2px; }
.readout { font-size: 14.5px; line-height: 1.55; color: var(--ink-2); background: var(--paper); border: 1px dashed var(--line); border-radius: 12px; padding: 10px 12px; margin-top: 10px; min-height: 3.2em; }
.readout b { color: var(--ink); }

/* trust badges */
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 10px; }
.badge { display: inline-flex; align-items: center; gap: 5px; font: 600 12px var(--f-body); border-radius: 999px; padding: 3px 10px 3px 7px; border: 1px solid var(--line); color: var(--ink-2); background: var(--paper); }
.badge svg { width: 14px; height: 14px; }
.badge.solid { border-color: color-mix(in srgb, var(--good) 45%, var(--line)); }
.badge.solid svg { color: var(--good); }
.badge.hint svg { color: var(--warning); }
.badge.one svg { color: var(--serious); }
.badge.meas svg { color: var(--pen); }
.badge.pre svg { color: var(--ink); }

/* margin notes (handwritten) */
.note { font: 500 23px/1.25 var(--f-hand); color: var(--note-ink); background: var(--note); padding: 12px 16px 12px; border-radius: 4px 14px 6px 12px; margin: 22px 0; box-shadow: 0 6px 18px rgba(80, 60, 0, .10); transform: rotate(-1.2deg); max-width: 30em; position: relative; }
.note .ar { display: block; font-family: var(--f-ar); font-size: 17px; margin-top: 6px; opacity: .85; }
.note.r { transform: rotate(1deg); margin-inline-start: auto; }
@media (min-width: 1180px) {
  .chapter .col { position: relative; }
  .note.side { position: absolute; right: -250px; width: 220px; margin: 0; font-size: 21px; }
}

/* for-the-nerds disclosure */
details.nerd { border-top: 1px dashed var(--line); margin-top: 14px; padding-top: 8px; }
details.nerd summary { cursor: pointer; list-style: none; font: 600 14px var(--f-body); color: var(--pen); display: inline-flex; align-items: center; gap: 6px; min-height: 32px; }
details.nerd summary::-webkit-details-marker { display: none; }
details.nerd summary::before { content: ""; width: 8px; height: 8px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(-45deg); transition: transform .2s; margin-inline-end: 4px; }
details.nerd[open] summary::before { transform: rotate(45deg); }
details.nerd .body { font-size: 14px; line-height: 1.6; color: var(--ink-2); padding: 6px 0 4px; }
details.nerd .body ul { padding-inline-start: 18px; margin: 6px 0; }
details.nerd .body code { font-size: 12.5px; background: var(--paper-3); padding: 1px 5px; border-radius: 5px; }

/* primer box */
.primer { display: grid; gap: 14px; grid-template-columns: 1fr; background: var(--paper-2); border: 2px solid var(--ink); border-radius: 18px; padding: 18px; margin: 26px 0; }
@media (min-width: 640px) { .primer { grid-template-columns: 1.1fr 1fr; align-items: center; } }
.primer h3 { font: 700 20px var(--f-display); margin: 0 0 6px; }
.primer p { font-size: 15.5px; margin: 0 0 8px; }

/* chart text */
.chart text { font: 12px var(--f-body); fill: var(--ink-2); }
.chart .t-strong { fill: var(--ink); font-weight: 600; }
.chart .t-hand { font: 600 19px var(--f-hand); fill: var(--marker); }
.chart .axis path, .chart .axis line { stroke: var(--axis); }
.chart .axis text { fill: var(--muted); font-size: 11.5px; }
.chart .grid line { stroke: var(--line); stroke-dasharray: 2 3; }
.chart .ref { stroke: var(--ink-2); stroke-width: 1.2; stroke-dasharray: 4 3; }

/* tooltip */
.tip { position: fixed; z-index: 50; pointer-events: none; max-width: 280px; background: var(--ink); color: var(--paper); font: 13px/1.45 var(--f-body); padding: 8px 10px; border-radius: 10px; opacity: 0; transition: opacity .12s; box-shadow: 0 8px 24px rgba(0,0,0,.18); }
.tip b { color: var(--paper); }

/* table twin */
.tbl-btn { font: 500 12.5px var(--f-body); color: var(--muted); background: none; border: 0; padding: 4px 0; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.tbl { overflow-x: auto; max-height: 340px; margin-top: 6px; }
.tbl table { border-collapse: collapse; font-size: 12.5px; width: 100%; }
.tbl th, .tbl td { text-align: left; padding: 4px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tbl th { color: var(--muted); font-weight: 600; position: sticky; top: 0; background: var(--paper-2); }

/* matrix */
.matrix { display: grid; gap: 4px; font-size: 12.5px; }
.matrix .hdr { font-weight: 600; color: var(--ink-2); display: flex; align-items: flex-end; justify-content: center; text-align: center; line-height: 1.2; padding: 0 2px 4px; min-height: 40px; }
.matrix .rowh { display: flex; align-items: center; gap: 6px; font-weight: 600; color: var(--ink); line-height: 1.15; }
.matrix .rowh svg { width: 20px; height: 20px; flex: none; }
.cell { border-radius: 10px; min-height: 42px; display: flex; align-items: center; justify-content: center; cursor: pointer; border: 1px solid var(--line); background: var(--paper); position: relative; padding: 0; font: inherit; color: var(--ink); }
.cell svg { width: 26px; height: 26px; }
.cell.sel { outline: 2.5px solid var(--ink); outline-offset: 1px; }
@media (max-width: 640px) { .matrix .rowh span.full { display: none; } .matrix .hdr { font-size: 10.5px; min-height: 52px; writing-mode: vertical-rl; transform: rotate(180deg); justify-content: flex-start; } .cell { min-height: 36px; } .cell svg { width: 20px; height: 20px; } }
.cellcard { margin-top: 14px; border-radius: 14px; border: 1px solid var(--line); background: var(--paper); padding: 14px; min-height: 120px; }
.cellcard .k { font: 600 12px var(--f-body); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.cellcard .v { font: 750 30px/1.1 var(--f-display); margin: 4px 0; }

/* changed / unchanged board */
.board { display: grid; grid-template-columns: 1fr; gap: 12px; margin: 18px 0; }
@media (min-width: 680px) { .board { grid-template-columns: 1fr 1fr; } }
.board .side { border-radius: 16px; padding: 14px 16px; border: 1px solid var(--line); background: var(--paper-2); }
.board h4 { font: 700 17px var(--f-display); margin: 0 0 8px; display: flex; align-items: center; gap: 8px; }
.board ul { margin: 0; padding: 0; list-style: none; }
.board li { padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; line-height: 1.45; }
.board li:last-child { border-bottom: 0; }
.board li b { font-variant-numeric: tabular-nums; }

/* trust chips */
.trust { display: grid; gap: 14px; }
.trust .grp h4 { font: 700 15px var(--f-display); margin: 0 0 6px; color: var(--ink-2); }
.trust .chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-flex; align-items: center; gap: 6px; border-radius: 999px; padding: 5px 11px 5px 5px; font: 500 13px var(--f-body); border: 1px solid var(--line); background: var(--paper); color: var(--ink); cursor: pointer; }
.chip .g { width: 22px; height: 22px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font: 700 12px var(--f-body); color: #fff; }
.chip.sel { outline: 2px solid var(--ink); }

/* waffle */
.waffle { display: grid; grid-template-columns: repeat(20, 1fr); gap: 3px; max-width: 520px; }
.waffle i { aspect-ratio: 1; border-radius: 3px; background: var(--s1); transform: scale(.2); opacity: 0; transition: transform .35s cubic-bezier(.3,1.4,.6,1), opacity .3s; }
.waffle i.open { background: transparent; border: 1.6px solid var(--s2); }
.waffle.in i { transform: scale(1); opacity: 1; }

/* epilogue + footer */
.epi { padding: 80px 0 40px; }
.epi .para { font: 500 clamp(19px, 2.4vw, 23px)/1.6 var(--f-display); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 26px 0; }
.cta a { display: inline-flex; align-items: center; gap: 8px; font: 600 15px var(--f-body); text-decoration: none; padding: 11px 18px; border-radius: 999px; border: 1.5px solid var(--ink); color: var(--ink); background: var(--paper-2); }
.cta a.primary { background: var(--ink); color: var(--paper); }
.cta a svg { width: 18px; height: 18px; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; font-size: 13.5px; color: var(--muted); }

/* reveal on scroll */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .rv { opacity: 1; transform: none; transition: none; } .waffle i { transform: none; opacity: 1; transition: none; } .scrollcue svg { animation: none; } html { scroll-behavior: auto; } }

/* score (episode multitrack) */
.score .lane-lbl { font: 600 11.5px var(--f-body); fill: var(--ink-2); }
.score .lane-bg { fill: var(--paper); }
.score .win { fill: var(--hl); stroke: var(--marker); stroke-width: 1.5; cursor: grab; }
.score .playhead { stroke: var(--marker); stroke-width: 2; }
.play-btn { display: inline-flex; align-items: center; gap: 6px; }
.play-btn svg { width: 14px; height: 14px; }
@media (max-width: 520px) { .bar .logo span { display: none; } .bar .logo { font-size: 15px; overflow: hidden; text-overflow: ellipsis; min-width: 0; } .bar .prog { min-width: 24px; } }
@media (max-width: 520px) { .matrix .rowh { font-size: 11px; gap: 3px; } .matrix .rowh svg { width: 16px; height: 16px; } }