/* ByteSizeNotes chapter widgets ("Try it" boxes).
   Themed for the live notes sheet on new.bytesizenotes.com: white paper, ink #14202c, Manrope headings,
   DM Sans body, lime marker #c4f69a, violet ink #4139c3 (the reading-island accent in launch-theme.css).
   No CSS keyframe animation: the notes theme sets `animation:none!important` on every element, so all
   motion is started by the student and driven from bsn-widgets.js (rAF / Web Animations API). */
.bw {
  --bw-surface: #f6f8fb;
  --bw-panel: #fff;
  --bw-panel-2: #eef2f7;
  --bw-line: #d9e0e8;
  --bw-line-2: #b9c4d2;
  --bw-ink: #14202c;
  --bw-muted: #485667;
  --bw-dim: #5b6778;
  --bw-acc: #4139c3;          /* violet ink: links, strokes, values */
  --bw-acc-soft: #ecebfb;
  --bw-lime: #c4f69a;         /* "on" fills, same as the notes marker */
  --bw-lime-ink: #1d3311;
  --bw-lime-line: #8fbf63;
  --bw-warm: #9a5b00;         /* data bus, parity bit, decimal values */
  --bw-warm-soft: #fff1d6;
  --bw-warm-line: #e0a73a;
  --bw-ok: #2f6b1f;
  --bw-bad: #b42318;
  --bw-bad-soft: #fde8e6;
  --bw-bad-line: #e5786c;
  --bw-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --bw-display: Manrope, "DM Sans", system-ui, sans-serif;
  position: relative;
  margin: 26px 0 30px;
  border-radius: 14px;
  background: var(--bw-surface);
  border: 1px solid var(--bw-line);
  color: var(--bw-ink);
  font-size: 15px;
  line-height: 1.55;
  overflow: hidden;
  color-scheme: light;
}
.bw * { box-sizing: border-box; }
.bw-head { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; padding: 14px 18px 12px; background: var(--bw-panel); border-bottom: 1px solid var(--bw-line); }
.bw-tag { font: 700 .72rem/1 var(--bw-display); color: var(--bw-lime-ink); background: var(--bw-lime); padding: 5px 8px; border-radius: 6px; }
.bw-title { font: 800 1.02rem/1.25 var(--bw-display); letter-spacing: -.01em; color: var(--bw-ink); }
.bw-hint { flex-basis: 100%; font-size: .9rem; color: var(--bw-muted); }
.bw-body { padding: 16px 18px 6px; }
.bw-status { margin: 0; padding: 10px 18px 16px; min-height: 2.6em; font-size: .93rem; color: var(--bw-muted); }
.bw-status b { color: var(--bw-ink); font-weight: 700; }
.bw-status .ok { color: var(--bw-ok); font-weight: 600; } .bw-status .bad { color: var(--bw-bad); font-weight: 600; } .bw-status .warn { color: var(--bw-warm); font-weight: 600; }

/* controls */
.bw-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.bw-row + .bw-row { margin-top: 10px; }
.bw-btn { appearance: none; border: 1px solid var(--bw-line-2); background: var(--bw-panel); color: var(--bw-ink); border-radius: 9px; padding: 8px 13px; font-family: inherit; font-size: .86rem; font-weight: 600; line-height: 1.1; cursor: pointer; min-height: 38px; transition: background .15s, border-color .15s, transform .1s; }
.bw-btn:hover { border-color: var(--bw-acc); }
.bw-btn:active { transform: translateY(1px); }
.bw-btn.solid { background: var(--bw-lime); color: var(--bw-lime-ink); border-color: #729348; }
.bw-btn.solid:hover { background: #b5ec86; }
.bw-btn.quiet { background: transparent; color: var(--bw-muted); border-color: var(--bw-line); }
.bw-btn[aria-pressed="true"] { background: var(--bw-lime); color: var(--bw-lime-ink); border-color: #729348; }
.bw-btn:disabled { opacity: .5; cursor: default; }
.bw :focus-visible { outline: 3px solid #6751db; outline-offset: 2px; }
.bw-input { width: 100%; max-width: 380px; background: var(--bw-panel); border: 1px solid var(--bw-line-2); color: var(--bw-ink); border-radius: 9px; padding: 9px 12px; font: 600 1rem/1.25 var(--bw-mono); letter-spacing: .03em; }
.bw-input:focus { border-color: var(--bw-acc); }
.bw-label { font-size: .8rem; font-weight: 600; color: var(--bw-muted); }
.bw-field { display: block; margin: 14px 0 6px; }
.bw-range { display: grid; gap: 4px; min-width: 180px; flex: 1; }
.bw-range input { width: 100%; accent-color: var(--bw-acc); }
.bw-range b { color: var(--bw-acc); font: 700 .86rem/1 var(--bw-mono); }
.bw-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; overscroll-behavior-x: contain; }

/* readouts */
.bw-readout { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.bw-chip { display: grid; gap: 2px; padding: 8px 12px; border-radius: 10px; background: var(--bw-panel); border: 1px solid var(--bw-line); min-width: 92px; }
.bw-chip span { font-size: .72rem; font-weight: 600; color: var(--bw-dim); }
.bw-chip b { font: 700 1.15rem/1.2 var(--bw-mono); color: var(--bw-acc); }
.bw-chip.bad b { color: var(--bw-bad); } .bw-chip.ok b { color: var(--bw-ok); } .bw-chip.amber b { color: var(--bw-warm); }

/* bits */
.bw-bits { display: grid; grid-template-columns: repeat(var(--n, 8), minmax(0, 1fr)); gap: 6px; max-width: 520px; }
.bw-bit { position: relative; aspect-ratio: 4 / 5; border: 1px solid var(--bw-line-2); border-radius: 9px; background: var(--bw-panel); color: #8a96a6; font: 700 clamp(18px, 3.4vw, 26px)/1 var(--bw-mono); display: grid; place-items: center; cursor: pointer; transition: transform .28s cubic-bezier(.3, .7, .3, 1), background .2s, color .2s, border-color .2s; padding: 0; }
.bw-bit.on { background: var(--bw-lime); color: var(--bw-lime-ink); border-color: var(--bw-lime-line); }
.bw-bit.p { border-color: var(--bw-warm-line); border-style: dashed; }
.bw-bit.p.on { background: var(--bw-warm-soft); color: var(--bw-warm); border-style: solid; }
.bw-bit.flip { background: var(--bw-bad-soft) !important; color: var(--bw-bad) !important; border-color: var(--bw-bad-line) !important; }
.bw-bit.ghost { opacity: .4; cursor: default; }
.bw-weights { display: grid; grid-template-columns: repeat(var(--n, 8), minmax(0, 1fr)); gap: 6px; max-width: 520px; margin-top: 4px; font: 500 .7rem/1 var(--bw-mono); color: var(--bw-dim); text-align: center; }

/* 1.1 shift */
.bw-shift-wrap { position: relative; display: flex; align-items: center; gap: 10px; }
.bw-lost { min-width: 54px; height: 54px; border-radius: 10px; border: 1px dashed var(--bw-bad-line); display: grid; place-items: center; font: 700 .72rem/1.1 var(--bw-mono); color: var(--bw-bad); text-align: center; }
.bw-lost.in { background: var(--bw-bad-soft); }
.bw-sum { display: grid; grid-template-columns: 28px repeat(9, minmax(0, 1fr)); gap: 4px; max-width: 520px; font: 700 clamp(14px, 2.6vw, 20px)/1.6 var(--bw-mono); text-align: center; margin-top: 12px; }
.bw-sum .lab { color: var(--bw-dim); text-align: left; font-size: .8rem; }
.bw-sum .c { color: var(--bw-warm); font-size: .75em; }
.bw-sum .r { border-top: 2px solid var(--bw-ink); }
.bw-sum .hot { color: var(--bw-acc); }
.bw-sum .ovf { color: var(--bw-bad); text-decoration: line-through; }

/* 1.2 text tiles */
.bw-tiles { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.bw-tile { width: 108px; padding: 10px; border-radius: 11px; background: var(--bw-panel); border: 1px solid var(--bw-line); display: grid; gap: 3px; text-align: center; }
.bw-tile .ch { font: 800 1.6rem/1.15 var(--bw-display); color: var(--bw-ink); }
.bw-tile .dn { font: 700 .84rem/1 var(--bw-mono); color: var(--bw-warm); }
.bw-tile .bn { font: 600 .82rem/1.25 var(--bw-mono); color: var(--bw-acc); }
.bw-tile .bn span { white-space: nowrap; }
.bw-tile .uni { font-size: .66rem; font-weight: 700; color: var(--bw-bad); }

/* 1.2 sound */
.bw-canvas { display: block; width: 100%; height: 200px; border-radius: 10px; background: var(--bw-panel); border: 1px solid var(--bw-line); }

/* 1.3 rle */
.bw-pixels { display: grid; grid-template-columns: repeat(16, minmax(0, 1fr)); gap: 3px; max-width: 560px; }
.bw-cell { aspect-ratio: 1; border-radius: 4px; border: 1px solid var(--bw-line-2); cursor: pointer; padding: 0; transition: transform .15s, box-shadow .15s; }
.bw-cell.hl { transform: translateY(-4px); box-shadow: 0 0 0 2px var(--bw-acc); }
.bw-runs { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.bw-run { display: inline-flex; align-items: center; gap: 6px; padding: 6px 9px; border-radius: 9px; background: var(--bw-panel); border: 1px solid var(--bw-line); font: 700 .88rem/1 var(--bw-mono); }
.bw-run i { width: 14px; height: 14px; border-radius: 3px; display: inline-block; border: 1px solid var(--bw-line-2); }

/* svg diagrams (2.1, 5.1) */
.bw-svg { display: block; width: 100%; height: auto; max-width: 640px; overflow: visible; }
.bw-svg .link { fill: none; stroke: #b9c4d2; stroke-width: 2; stroke-dasharray: 5 6; }
.bw-svg .node { fill: var(--bw-panel); stroke: var(--bw-line-2); stroke-width: 1.5; }
.bw-svg .end { fill: var(--bw-panel); stroke: var(--bw-ink); stroke-width: 2; }
.bw-svg text { font: 700 11px var(--bw-mono); fill: var(--bw-muted); }
.bw-svg .pk rect { fill: var(--bw-lime); stroke: var(--bw-lime-line); }
.bw-svg .pk text { fill: var(--bw-lime-ink); font-weight: 800; font-size: 11px; text-anchor: middle; }
.bw-svg .pk.lost rect { fill: var(--bw-bad-soft); stroke: var(--bw-bad-line); }
.bw-svg .pk.lost text { fill: var(--bw-bad); }
.bw-svg .pk.re rect { fill: var(--bw-warm-soft); stroke: var(--bw-warm-line); }
.bw-svg .pk.re text { fill: var(--bw-warm); }

/* 2.1 packets */
.bw-packets { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.bw-packet { display: grid; grid-template-columns: auto 1fr auto; border-radius: 10px; overflow: hidden; border: 1px solid var(--bw-line); font: 600 .74rem/1.3 var(--bw-mono); min-width: 210px; flex: 1; max-width: 300px; background: var(--bw-panel); }
.bw-packet > div { padding: 7px 8px; }
.bw-packet .h { background: var(--bw-acc-soft); color: var(--bw-acc); }
.bw-packet .p { color: var(--bw-ink); font-size: .9rem; display: grid; align-content: center; }
.bw-packet .t { background: var(--bw-warm-soft); color: var(--bw-warm); }
.bw-packet small { display: block; color: var(--bw-dim); font-size: .62rem; font-weight: 700; }
.bw-arrive { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 10px; font-size: .8rem; font-weight: 600; color: var(--bw-muted); }
.bw-arrive .slot { min-width: 40px; height: 34px; padding: 0 8px; border-radius: 8px; display: grid; place-items: center; background: var(--bw-panel); border: 1px dashed var(--bw-line-2); color: var(--bw-dim); font: 700 .86rem/1 var(--bw-mono); transition: background .25s, border-color .25s; }
.bw-arrive .slot.in { background: var(--bw-lime); color: var(--bw-lime-ink); border-style: solid; border-color: var(--bw-lime-line); }
.bw-arrive .slot.miss { border-color: var(--bw-bad-line); color: var(--bw-bad); background: var(--bw-bad-soft); }
.bw-msg { margin-top: 10px; font: 700 1.15rem/1.3 var(--bw-mono); color: var(--bw-ok); min-height: 1.4em; letter-spacing: .04em; }

/* 2.2 parity */
.bw-wire { position: relative; height: 34px; margin: 14px 0 30px; max-width: 560px; }
.bw-wire::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 2px dashed var(--bw-line-2); }
.bw-wire .lbl { position: absolute; top: 100%; font-size: .74rem; font-weight: 600; color: var(--bw-dim); }
.bw-wire .lbl.r { right: 0; }
.bw-wire .dot { position: absolute; top: 50%; left: 0; width: 46px; height: 22px; margin-top: -11px; border-radius: 6px; background: var(--bw-lime); border: 1px solid var(--bw-lime-line); color: var(--bw-lime-ink); font: 800 .7rem/20px var(--bw-mono); text-align: center; opacity: 0; }
.bw-wire .dot.hit { background: var(--bw-bad-soft); border-color: var(--bw-bad-line); color: var(--bw-bad); }

/* 2.3 encryption */
.bw-tabs { display: inline-flex; padding: 3px; border-radius: 10px; background: var(--bw-panel-2); border: 1px solid var(--bw-line); gap: 2px; }
.bw-tabs .bw-btn { border: 0; background: transparent; color: var(--bw-muted); min-height: 32px; padding: 6px 12px; }
.bw-tabs .bw-btn[aria-pressed="true"] { background: var(--bw-panel); color: var(--bw-ink); box-shadow: 0 1px 2px rgba(20, 32, 44, .12); }
.bw-flow { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr); gap: 8px; align-items: stretch; margin-top: 14px; }
.bw-stage { border-radius: 12px; background: var(--bw-panel); border: 1px solid var(--bw-line); padding: 10px; display: grid; gap: 6px; align-content: start; min-width: 0; }
.bw-stage h4 { margin: 0; font-size: .74rem; font-weight: 700; line-height: 1.25; color: var(--bw-dim); }
.bw-stage .txt { font: 700 1rem/1.4 var(--bw-mono); letter-spacing: .05em; word-break: break-all; min-height: 1.4em; }
.bw-stage .txt.c { color: var(--bw-acc); } .bw-stage .txt.p { color: var(--bw-ink); } .bw-stage .txt.x { color: var(--bw-bad); }
.bw-arrow { display: grid; place-items: center; align-content: center; gap: 4px; font-size: .72rem; font-weight: 600; color: var(--bw-dim); text-align: center; min-width: 64px; }
.bw-arrow .go { width: 100%; height: 2px; background: var(--bw-line-2); }
.bw-key { display: inline-flex; align-items: center; gap: 5px; padding: 4px 8px; border-radius: 999px; font: 700 .72rem/1 var(--bw-mono); white-space: nowrap; border: 1px solid transparent; }
.bw-key svg { width: 13px; height: 13px; }
.bw-key.shared { background: var(--bw-acc-soft); color: var(--bw-acc); }
.bw-key.pub { background: #e9fbd9; color: var(--bw-ok); border-color: #cbe8b1; }
.bw-key.priv { background: var(--bw-warm-soft); color: var(--bw-warm); border-color: #f2d49a; }
.bw-map { display: block; min-height: 1.3em; margin-top: 2px; font: 700 .76rem/1.3 var(--bw-mono); color: var(--bw-warm); text-align: center; }
.bw-eve { margin-top: 10px; border-radius: 12px; border: 1px dashed var(--bw-bad-line); background: #fff; padding: 9px 12px; display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: baseline; font-size: .9rem; color: var(--bw-muted); }
.bw-eve b { font-family: var(--bw-mono); color: var(--bw-bad); letter-spacing: .05em; word-break: break-all; }
.bw-letter { display: inline-block; white-space: pre; border-radius: 3px; }
.bw-letter.spin { color: var(--bw-warm); }
.bw-flow .txt.p .bw-letter.now { color: var(--bw-lime-ink); background: var(--bw-lime); }
.bw-note { margin: 8px 0 0; font-size: .8rem; color: var(--bw-dim); }

/* 3.1 cpu */
.bw-cpu text { font: 700 12px var(--bw-mono); fill: var(--bw-ink); }
.bw-cpu .reg rect { fill: var(--bw-panel); stroke: var(--bw-line-2); stroke-width: 1.2; rx: 7; }
.bw-cpu .reg.hot rect { stroke: var(--bw-acc); stroke-width: 2.4; fill: var(--bw-acc-soft); }
.bw-cpu .reg .k { font-size: 10px; fill: var(--bw-dim); }
.bw-cpu .reg .v { font-size: 13px; fill: var(--bw-acc); }
.bw-cpu .box { fill: #fff; stroke: var(--bw-line-2); stroke-width: 1.5; rx: 12; }
.bw-cpu .boxlbl { font-size: 11px; fill: var(--bw-ink); letter-spacing: .08em; }
.bw-cpu .bus { fill: none; stroke-width: 5; stroke-linecap: round; opacity: .28; }
.bw-cpu .bus.on { opacity: 1; }
.bw-cpu .bus.addr { stroke: var(--bw-acc); } .bw-cpu .bus.data { stroke: var(--bw-warm-line); } .bw-cpu .bus.ctrl { stroke: #2f6b1f; }
.bw-cpu .buslbl { font-size: 10px; }
.bw-cpu .mem rect { fill: var(--bw-panel); stroke: var(--bw-line); rx: 5; }
.bw-cpu .mem.hot rect { stroke: var(--bw-warm-line); stroke-width: 2; fill: var(--bw-warm-soft); }
.bw-cpu .mem text { font-size: 11.5px; }
.bw-cpu .mem .ma { fill: var(--bw-dim); }
.bw-scroll .bw-cpu { min-width: 540px; }
.bw-steps { margin: 10px 0 0; padding: 0; list-style: none; display: grid; gap: 2px; counter-reset: s; }
.bw-steps li { counter-increment: s; display: flex; gap: 8px; padding: 6px 9px; border-radius: 8px; font-size: .9rem; color: var(--bw-dim); transition: background .2s, color .2s; }
.bw-steps li::before { content: counter(s); font: 700 .74rem/1.7 var(--bw-mono); color: inherit; min-width: 14px; }
.bw-steps li.on { background: var(--bw-lime); color: var(--bw-lime-ink); }
.bw-steps li.done { color: var(--bw-ink); }

/* 4.1 interrupt */
.bw-int { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 12px; }
.bw-panel { border-radius: 12px; background: var(--bw-panel); border: 1px solid var(--bw-line); padding: 12px; min-width: 0; }
.bw-panel h4 { margin: 0 0 8px; font-size: .78rem; font-weight: 700; color: var(--bw-dim); display: flex; justify-content: space-between; gap: 8px; }
.bw-prog { display: grid; gap: 3px; font: 600 .86rem/1.4 var(--bw-mono); }
.bw-prog div { padding: 3px 8px; border-radius: 6px; color: var(--bw-muted); display: flex; gap: 10px; }
.bw-prog div span { color: var(--bw-dim); width: 18px; }
.bw-prog div.on { background: var(--bw-lime); color: var(--bw-lime-ink); }
.bw-prog.isr div.on { background: var(--bw-warm-soft); color: var(--bw-warm); }
.bw-flag { display: inline-flex; align-items: center; gap: 6px; font: 700 .74rem/1 var(--bw-mono); color: var(--bw-dim); }
.bw-flag i { width: 10px; height: 10px; border-radius: 50%; background: #c3ccd7; }
.bw-flag.on { color: var(--bw-bad); } .bw-flag.on i { background: var(--bw-bad); box-shadow: 0 0 0 3px var(--bw-bad-soft); }
.bw-stack { font: 600 .84rem/1.5 var(--bw-mono); color: var(--bw-muted); min-height: 3em; }
.bw-stack b { color: var(--bw-warm); }

/* 5.1 dns */
.bw-url { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; font: 700 .86rem/1 var(--bw-mono); }
.bw-url span { padding: 7px 9px; border-radius: 7px; background: var(--bw-panel); border: 1px solid var(--bw-line); min-width: 0; word-break: break-all; }
.bw-url span small { display: block; font-family: var(--bw-display); font-size: .66rem; font-weight: 600; line-height: 1; color: var(--bw-dim); margin-bottom: 4px; }
.bw-url .pr { color: var(--bw-ok); } .bw-url .dm { color: var(--bw-acc); } .bw-url .pa { color: var(--bw-warm); }
.bw-page { margin-top: 10px; border-radius: 10px; background: #fff; border: 1px solid var(--bw-line); box-shadow: 0 8px 20px -14px rgba(20, 32, 44, .4); color: var(--bw-ink); padding: 12px 14px; max-width: 360px; font-size: .86rem; opacity: 0; transform: scale(.97); transition: opacity .35s, transform .35s; }
.bw-page.on { opacity: 1; transform: none; }
.bw-page h5 { margin: 0 0 4px; font: 800 1rem/1.2 var(--bw-display); }
.bw-page i { display: block; height: 7px; border-radius: 4px; background: var(--bw-panel-2); margin-top: 6px; }

/* 6.1 automated */
.bw-loop { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 6px; margin-top: 12px; }
.bw-loop div { border-radius: 10px; background: var(--bw-panel); border: 1px solid var(--bw-line); padding: 9px 8px; text-align: center; font-size: .8rem; color: var(--bw-muted); transition: background .25s, border-color .25s, color .25s; min-width: 0; }
.bw-loop div b { display: block; font: 800 .8rem/1.2 var(--bw-display); color: var(--bw-ink); margin-bottom: 3px; }
.bw-loop div.on { border-color: var(--bw-lime-line); background: var(--bw-lime); color: var(--bw-lime-ink); }
.bw-green { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 14px; align-items: center; }
.bw-thermo { width: 34px; height: 150px; border-radius: 17px; background: var(--bw-panel); border: 1px solid var(--bw-line-2); position: relative; overflow: hidden; }
.bw-thermo i { position: absolute; left: 6px; right: 6px; bottom: 6px; border-radius: 12px; background: linear-gradient(#d8432f, #f0a33a); transition: height .5s; }
.bw-fan { width: 54px; height: 54px; border-radius: 50%; border: 2px solid var(--bw-line-2); display: grid; place-items: center; color: #8a96a6; background: var(--bw-panel); }
.bw-fan svg { width: 34px; height: 34px; }
.bw-fan.on { border-color: var(--bw-acc); color: var(--bw-acc); }

@media (max-width: 640px) {
  .bw-flow { grid-template-columns: minmax(0, 1fr); }
  .bw-arrow { grid-auto-flow: column; justify-content: start; min-width: 0; }
  .bw-arrow .go { width: 28px; }
  .bw-int { grid-template-columns: minmax(0, 1fr); }
  .bw-loop { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bw-head { padding: 12px 14px; } .bw-body { padding: 14px 14px 4px; } .bw-status { padding: 10px 14px 14px; }
}
@media (prefers-reduced-motion: reduce) {
  .bw *, .bw *::before { transition-duration: .001s !important; }
}
.bw-chip span::first-letter, .bw-url span small::first-letter, .bw-packet small::first-letter { text-transform: uppercase; }