/* Knightmotive */
/* Palette: white, black and one blue (Apple-style neutrals). */
:root {
  --paper: #f5f5f7; --panel: #ffffff; --ink: #1d1d1f; --ink-2: #424245; --muted: #6e6e73; --rule: #e5e5ea; --rule-2: #d2d2d7;
  --accent: #0071e3; --accent-ink: #ffffff; --accent-soft: #e8f2fd; --accent-2: #0066cc;
  --good: #1b8a3a; --good-soft: #e7f6ec; --warn: #b25f00; --warn-soft: #fdf1e3; --bad: #d70015; --bad-soft: #fde8ea; --orange: #c75300; --orange-soft: #fdeee2;
  --sq-light: #ffffff; --sq-dark: #5b8ac6; --coord-l: #5b8ac6; --coord-d: #ffffff;
  --hl-sel: rgba(255, 204, 0, .62); --hl-last: rgba(255, 214, 10, .45); --dot: rgba(0, 0, 0, .28);
  --piece-ink: #000000; --piece-white: #ffffff; --piece-black-line: #b8b8b8;
  --shadow: 0 2px 6px rgba(0, 0, 0, .04), 0 12px 32px rgba(0, 0, 0, .06);
  --f-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --f-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --f-mono: "SF Mono", ui-monospace, Menlo, Consolas, "Roboto Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #000000; --panel: #1c1c1e; --ink: #f5f5f7; --ink-2: #d1d1d6; --muted: #98989d; --rule: #2c2c2e; --rule-2: #3a3a3c;
    --accent: #2997ff; --accent-ink: #ffffff; --accent-soft: #0a2540; --accent-2: #2997ff;
    --good: #30d158; --good-soft: #0f2b18; --warn: #ffb340; --warn-soft: #2f2410; --bad: #ff453a; --bad-soft: #3a1412; --orange: #ff9f0a; --orange-soft: #33230c;
    --shadow: 0 2px 6px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .4);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #000000; --panel: #1c1c1e; --ink: #f5f5f7; --ink-2: #d1d1d6; --muted: #98989d; --rule: #2c2c2e; --rule-2: #3a3a3c;
  --accent: #2997ff; --accent-ink: #ffffff; --accent-soft: #0a2540; --accent-2: #2997ff;
  --good: #30d158; --good-soft: #0f2b18; --warn: #ffb340; --warn-soft: #2f2410; --bad: #ff453a; --bad-soft: #3a1412; --orange: #ff9f0a; --orange-soft: #33230c;
  --shadow: 0 2px 6px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .4);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--paper); color: var(--ink); font: 400 15px/1.55 var(--f-body); -webkit-font-smoothing: antialiased; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.eyebrow { margin: 0; font: 500 11px/1.2 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.note { margin: 0; color: var(--muted); font-size: 13px; }
[hidden] { display: none !important; }

/* top bar */
.top { border-bottom: 1px solid var(--rule); background: var(--paper); }
.top-in { max-width: 1320px; margin: 0 auto; padding: 0 24px; min-height: 60px; display: flex; align-items: center; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); margin-right: auto; }
.brand svg { width: 30px; height: 30px; flex: none; }
.brand b { display: block; font: 600 19px/1.1 var(--f-display); letter-spacing: -.01em; }
.brand small { display: block; font-size: 11.5px; color: var(--muted); }
.nav { display: flex; gap: 2px; }
.nav a { text-decoration: none; color: var(--ink-2); font-size: 14px; padding: 8px 12px; border-radius: 8px; }
.nav a:hover { background: var(--rule); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--accent-soft); }
.top-tools { display: flex; gap: 6px; }
.icon-btn { width: 38px; height: 38px; display: inline-grid; place-items: center; border: 1px solid transparent; background: transparent; border-radius: 9px; cursor: pointer; color: var(--ink-2); }
.icon-btn:hover { background: var(--rule); color: var(--ink); }
.icon-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.voice-btn { display: inline-flex; align-items: center; gap: 6px; height: 38px; padding: 0 12px 0 10px; border: 1px solid var(--rule-2); border-radius: 999px; background: var(--panel); color: var(--ink-2); cursor: pointer; font-size: 13px; }
.voice-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.voice-btn .vb-s { font: 600 11px/1 var(--f-mono); padding: 3px 6px; border-radius: 999px; background: var(--rule); }
.voice-btn[aria-pressed="true"] { border-color: var(--accent); color: var(--ink); }
.voice-btn[aria-pressed="true"] .vb-s { background: var(--accent); color: var(--accent-ink); }
.opts { display: grid; gap: 8px; }
.opt { display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: 10px; align-items: start; text-align: left; border: 1px solid var(--rule-2); background: var(--paper); border-radius: 10px; padding: 10px 12px; cursor: pointer; font-size: 15px; line-height: 1.45; color: var(--ink); }
.opt b { font: 600 13px/1.6 var(--f-mono); color: var(--muted); }
.opt:hover:not([disabled]) { border-color: var(--accent); }
.opt.right { border-color: var(--good); background: var(--good-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); opacity: .8; }
.opt[disabled] { cursor: default; }
.line-san { margin: 0; font: 500 14px/1.6 var(--f-mono); color: var(--ink-2); }
#btn-sound .off { display: none; } #btn-sound[aria-pressed="false"] .on { display: none; } #btn-sound[aria-pressed="false"] .off { display: inline; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--rule-2); background: var(--panel); color: var(--ink); padding: 9px 14px; border-radius: 9px; font-weight: 500; font-size: 14px; cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--ink-2); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--ink-2); }
.btn.ghost:hover { background: var(--rule); }
.btn.danger { color: var(--bad); }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

/* play layout */
.play { max-width: 1320px; margin: 0 auto; padding: 20px 24px 32px; display: grid; grid-template-columns: minmax(0, 1fr) 400px; gap: 28px; align-items: start; }
.board-col { width: 100%; max-width: min(720px, calc(100vh - 230px)); justify-self: center; display: grid; gap: 10px; }
.strip { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; min-height: 34px; }
.who { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.who b { font-weight: 600; }
.who .lvl { font: 500 12px/1 var(--f-mono); color: var(--muted); }
.dot { width: 12px; height: 12px; border-radius: 50%; border: 1.5px solid var(--ink); display: inline-block; }
.dot.w { background: #fbfaf6; } .dot.b { background: #1c1a17; }
.caps { font-size: 16px; color: var(--muted); letter-spacing: -1px; min-height: 20px; }
.caps small { font: 500 12px/1 var(--f-mono); letter-spacing: 0; margin-left: 6px; color: var(--ink-2); }
.clock { font: 600 18px/1 var(--f-mono); font-variant-numeric: tabular-nums; padding: 7px 10px; border-radius: 8px; background: var(--panel); border: 1px solid var(--rule); }
.clock.run { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.clock.low { background: var(--bad); color: #fff; border-color: var(--bad); }
.controls { display: flex; flex-wrap: wrap; gap: 6px; }

/* board */
.board-frame { width: 100%; aspect-ratio: 1; position: relative; user-select: none; -webkit-user-select: none; }
.board.interactive { touch-action: none; }
.sq:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; z-index: 3; }
.board { position: absolute; inset: 0; display: grid; grid-template-columns: repeat(8, 1fr); grid-template-rows: repeat(8, 1fr); border-radius: 2px; overflow: hidden; box-shadow: 0 0 0 2px #555555, var(--shadow); }
.sq { position: relative; background: var(--sq-light); }
.sq.dark { background: var(--sq-dark); }
.sq .coord { position: absolute; font: 600 10px/1 var(--f-mono); pointer-events: none; color: var(--coord-l); }
.sq.dark .coord { color: var(--coord-d); }
.sq .coord.file { right: 4px; bottom: 3px; } .sq .coord.rank { left: 4px; top: 4px; }
.sq.sel::before, .sq.last::before, .sq.hint::before { content: ""; position: absolute; inset: 0; }
.sq.last::before { background: var(--hl-last); }
.sq.sel::before { background: var(--hl-sel); }
.sq.hint::before { box-shadow: inset 0 0 0 4px var(--accent); }
.sq.target::after { content: ""; position: absolute; left: 50%; top: 50%; width: 30%; height: 30%; transform: translate(-50%, -50%); border-radius: 50%; background: var(--dot); pointer-events: none; }
.sq.target.cap::after { width: 92%; height: 92%; background: transparent; border: 5px solid var(--dot); }
.sq.check { background-image: radial-gradient(circle, rgba(214, 51, 36, .85) 0%, rgba(214, 51, 36, .45) 40%, rgba(214, 51, 36, 0) 72%); }
.sq.hover { box-shadow: inset 0 0 0 3px rgba(255, 255, 255, .65); }
.piece { position: absolute; inset: 4%; width: 92%; height: 92%; pointer-events: none; z-index: 2; }
.piece .sil-w { fill: #ffffff; } .piece .line-w, .piece .body-b { fill: #000000; } .piece .sil-b { fill: #b8b8b8; stroke: #e6e6e6; stroke-width: 3; stroke-linejoin: round; }
.piece { overflow: visible; }
.board.interactive .sq { cursor: pointer; }
.drag-ghost { position: fixed; pointer-events: none; z-index: 1000; transform: translate(-50%, -50%); filter: drop-shadow(0 6px 10px rgba(0, 0, 0, .25)); }
.board-arrows { position: absolute; inset: 0; pointer-events: none; z-index: 5; }
.board-arrows .ar { stroke-linecap: round; opacity: .8; }
.promo { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(0, 0, 0, .35); z-index: 10; border-radius: 6px; }
.promo div { display: flex; gap: 6px; background: var(--panel); padding: 10px; border-radius: 10px; box-shadow: var(--shadow); }
.promo button { width: 64px; height: 64px; border: 1px solid var(--rule); border-radius: 8px; background: var(--sq-light); cursor: pointer; position: relative; }
.promo button svg { position: absolute; inset: 6%; width: 88%; height: 88%; }
.board-banner { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); z-index: 20; background: var(--panel); border-radius: 14px; box-shadow: var(--shadow); padding: 22px 26px; text-align: center; display: grid; gap: 10px; min-width: 240px; }
.board-banner h3 { margin: 0; font: 600 24px/1.2 var(--f-display); }

/* play side panel */
.side { position: sticky; top: 16px; background: var(--panel); border: 1px solid var(--rule); border-radius: 14px; padding: 18px; display: grid; gap: 14px; align-content: start; }
.side-head { display: grid; gap: 4px; }
.opening { margin: 2px 0 0; font: 600 17px/1.25 var(--f-display); }
.status { margin: 4px 0 0; font-size: 14px; color: var(--ink-2); min-height: 22px; }
.engine-state { margin: 0; font: 500 11px/1.4 var(--f-mono); color: var(--muted); }
.movelist { display: grid; grid-template-columns: 38px minmax(0, 1fr) minmax(0, 1fr); align-content: start; font: 500 14px/1.9 var(--f-mono); max-height: 320px; min-height: 120px; overflow-y: auto; border: 1px solid var(--rule); border-radius: 10px; padding: 8px 12px; background: var(--paper); }
.movelist .note { grid-column: 1 / -1; font-family: var(--f-body); }
.movelist .mn { color: var(--muted); }
.movelist .mv { padding: 0 4px; }
.result { border: 1px solid var(--accent); background: var(--accent-soft); border-radius: 12px; padding: 14px 16px; display: grid; gap: 8px; }
.result h2 { margin: 0; font: 600 24px/1.2 var(--f-display); }
.result .acts { display: flex; flex-wrap: wrap; gap: 6px; }
.rv-prog { display: grid; gap: 6px; font-size: 13px; color: var(--ink-2); }
.rv-prog .track { height: 6px; background: var(--rule); border-radius: 3px; overflow: hidden; }
.rv-prog .track i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.tag { display: inline-block; font: 600 11px/1 var(--f-mono); padding: 4px 7px; border-radius: 999px; margin-right: 6px; vertical-align: 1px; }
.tag.best, .tag.good { background: var(--good-soft); color: var(--good); }
.tag.inaccuracy { background: var(--warn-soft); color: var(--warn); }
.tag.mistake { background: var(--orange-soft); color: var(--orange); }
.tag.blunder { background: var(--bad-soft); color: var(--bad); }
.icon-btn.mic.live { background: var(--bad); color: #fff; }
.btn.sm { padding: 6px 10px; font-size: 13px; }

/* academy */
.acad { max-width: 1040px; margin: 0 auto; padding: 40px 24px 72px; display: grid; gap: 28px; grid-template-columns: minmax(0, 1fr); }
.acad > * { min-width: 0; }
.hero2 { display: grid; gap: 14px; }
.hero2 h1 { margin: 0; font: 600 clamp(30px, 4.6vw, 46px)/1.1 var(--f-display); letter-spacing: -.015em; max-width: 20ch; }
.lede { margin: 0; font-size: 17px; color: var(--ink-2); max-width: 62ch; }
.askbig { display: flex; align-items: center; gap: 6px; background: var(--panel); border: 1px solid var(--rule-2); border-radius: 14px; padding: 6px 6px 6px 16px; box-shadow: var(--shadow); margin-top: 6px; }
.askbig:focus-within { border-color: var(--accent); }
.askbig input { flex: 1; min-width: 0; border: 0; background: transparent; font: 400 16px/1.4 var(--f-body); color: var(--ink); padding: 10px 0; outline: none; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip-q { border: 1px solid var(--rule-2); background: var(--panel); color: var(--ink-2); border-radius: 999px; padding: 6px 12px; font-size: 13.5px; cursor: pointer; text-decoration: none; line-height: 1.3; }
.chip-q:hover { border-color: var(--accent); color: var(--ink); }
.answer { background: var(--panel); border: 1px solid var(--rule); border-left: 3px solid var(--accent); border-radius: 12px; padding: 18px 20px; display: grid; gap: 10px; }
.answer h2 { margin: 0; font: 600 20px/1.3 var(--f-display); }
.answer p { margin: 0; }
.ans-text { font: 400 17px/1.6 var(--f-display); white-space: pre-line; }
.ans-acts { display: flex; flex-wrap: wrap; gap: 6px; }
.continue { display: flex; align-items: center; justify-content: space-between; gap: 18px; background: var(--panel); border: 1px solid var(--rule); border-left: 4px solid var(--accent); border-radius: 16px; padding: 22px 24px; box-shadow: var(--shadow); }
.continue h2 { margin: 6px 0 4px; font: 600 24px/1.25 var(--f-display); }
.continue .btn { flex: none; }
.stages { display: grid; gap: 10px; }
.stage { background: var(--panel); border: 1px solid var(--rule); border-radius: 14px; overflow: hidden; }
.stage summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: 38px minmax(0, 1fr) 120px 44px; gap: 14px; align-items: center; padding: 16px 18px; }
.stage summary::-webkit-details-marker { display: none; }
.stage summary:hover { background: var(--paper); }
.st-n { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font: 600 15px/1 var(--f-mono); }
.st-main { display: grid; gap: 2px; min-width: 0; }
.st-main b { font: 600 18px/1.25 var(--f-display); }
.st-main span { font-size: 13px; color: var(--muted); }
.st-prog { height: 6px; background: var(--rule); border-radius: 3px; overflow: hidden; }
.st-prog i { display: block; height: 100%; background: var(--accent); }
.st-count { font: 500 13px/1 var(--f-mono); color: var(--muted); text-align: right; }
.lessons { list-style: none; margin: 0; padding: 0 0 8px; border-top: 1px solid var(--rule); }
.lessons a { display: grid; grid-template-columns: 44px minmax(0, 1fr) auto 22px; gap: 12px; align-items: center; padding: 11px 18px 11px 22px; text-decoration: none; color: var(--ink); font-size: 15px; }
.lessons a:hover { background: var(--paper); }
.lessons .ln { font: 500 13px/1 var(--f-mono); color: var(--muted); }
.lessons .lm { font-size: 12.5px; color: var(--muted); }
.lessons .ok { color: var(--good); font-weight: 600; text-align: center; }

/* first visit */
body.onboarding .top { display: none; }
.welcome { min-height: 100vh; display: grid; place-items: center; padding: 40px 20px 56px; }
.wz { width: min(640px, 100%); display: grid; gap: 22px; }
.wz-brand { display: flex; align-items: center; gap: 10px; font: 600 19px/1 var(--f-display); color: var(--ink); }
.wz-brand svg { width: 30px; height: 30px; }
.wz-dots { display: flex; gap: 6px; }
.wz-dots i { height: 4px; flex: 1; border-radius: 2px; background: var(--rule); }
.wz-dots i.done, .wz-dots i.now { background: var(--accent); }
.wz-dots i.now { opacity: .55; }
.wz-body { display: grid; gap: 18px; }
.wz-body h1 { margin: 6px 0 0; font: 600 clamp(28px, 4.2vw, 38px)/1.15 var(--f-display); letter-spacing: -.015em; }
.wz-lede { margin: 0; font-size: 16.5px; color: var(--ink-2); line-height: 1.6; }
.wz-field { display: grid; gap: 8px; font-size: 14px; color: var(--ink-2); }
.wz-field input { font: 400 18px/1.3 var(--f-body); color: var(--ink); background: var(--panel); border: 1px solid var(--rule-2); border-radius: 12px; padding: 14px 16px; outline: none; }
.wz-field input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.wz-field.inline { grid-template-columns: auto 140px; align-items: center; justify-content: start; gap: 14px; }
.wz-field.inline input { font-size: 16px; padding: 10px 12px; }
.bands { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.band, .vp { text-align: left; display: grid; gap: 3px; padding: 14px 16px; border: 1px solid var(--rule-2); border-radius: 14px; background: var(--panel); cursor: pointer; color: var(--ink); transition: border-color .15s, box-shadow .15s; }
.band b, .vp b { font: 600 16.5px/1.25 var(--f-display); }
.band span, .vp span { font-size: 13px; color: var(--muted); }
.band:hover, .vp:hover { border-color: var(--ink-2); }
.band.on, .vp.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); background: var(--accent-soft); }
.band:first-child { grid-column: 1 / -1; }
.voice-pick { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.voice-pick .vp { padding: 20px 18px; }
.wz-acts { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 6px; }
.wz-go { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.btn.big { padding: 12px 22px; font-size: 15.5px; border-radius: 11px; }
.plan { border: 1px solid var(--rule); border-radius: 14px; background: var(--panel); }
.plan-row { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 16px; padding: 14px 18px; border-top: 1px solid var(--rule); }
.plan-row:first-child { border-top: 0; }
.plan-k { font-size: 13px; color: var(--muted); padding-top: 2px; }
.plan-v { font: 600 16px/1.35 var(--f-display); }
.plan-v small { display: block; font: 400 13.5px/1.45 var(--f-body); color: var(--muted); margin-top: 2px; }

/* home */
.greet { display: grid; gap: 8px; }
.greet h1 { margin: 0; font: 600 clamp(30px, 4.4vw, 44px)/1.1 var(--f-display); letter-spacing: -.015em; }
.greet-sub { margin: 0; font-size: 16.5px; color: var(--ink-2); max-width: 60ch; }
.home-grid { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.home-grid > * { min-width: 0; }
.home-side { display: grid; gap: 20px; }
.card { background: var(--panel); border: 1px solid var(--rule); border-radius: 16px; padding: 20px 22px; display: grid; gap: 12px; }
.card h2 { margin: 0; font: 600 19px/1.25 var(--f-display); }
.card-h { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.card .askbig { box-shadow: none; margin: 0; padding: 4px 4px 4px 14px; border-radius: 12px; }
.card .askbig input { font-size: 15px; padding: 8px 0; }
.play-card .btn { justify-self: start; }
.path-list { border-top: 0; padding: 0; margin: 0 -22px -8px; }
.path-list li.next a { background: var(--accent-soft); }
.lessons .ok.nx { color: var(--accent); font-size: 11px; }
.all-stages { border-top: 1px solid var(--rule); padding-top: 18px; }
.all-stages > summary { cursor: pointer; list-style: none; font: 600 17px/1.3 var(--f-display); display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.all-stages > summary::-webkit-details-marker { display: none; }
.all-stages > summary::before { content: "+"; font: 500 16px/1 var(--f-mono); color: var(--muted); width: 14px; }
.all-stages[open] > summary::before { content: "–"; }
.all-stages .stages { margin-top: 14px; }
.stage.current { border-color: var(--accent); }
.st-main b em { font: 500 11px/1 var(--f-mono); font-style: normal; color: var(--accent); background: var(--accent-soft); padding: 3px 6px; border-radius: 999px; margin-left: 6px; vertical-align: 2px; letter-spacing: .04em; text-transform: uppercase; }

/* lesson player */
.lesson-wrap { max-width: 1320px; margin: 0 auto; padding: 20px 24px 40px; display: grid; grid-template-columns: minmax(0, 1fr) 440px; gap: 32px; align-items: start; }
.lesson-wrap > * { min-width: 0; }
.lesson-wrap .board-col { max-width: min(640px, calc(100vh - 150px)); }
.step-nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.dots { display: flex; flex-wrap: wrap; justify-content: center; gap: 5px; flex: 1; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--rule-2); cursor: pointer; }
.dots i.task { border-radius: 2px; }
.dots i.done { background: var(--muted); }
.dots i.solved { background: var(--good); }
.dots i.now { background: var(--accent); transform: scale(1.35); }
.lesson-panel { background: var(--panel); border: 1px solid var(--rule); border-radius: 14px; padding: 22px 24px; display: grid; gap: 12px; position: sticky; top: 16px; }
.lesson-panel h1 { margin: 0; font: 600 28px/1.15 var(--f-display); letter-spacing: -.01em; }
.ls-body { display: grid; gap: 12px; min-height: 120px; }
.step-text { margin: 0; font: 400 18px/1.6 var(--f-display); }
.fb { font-size: 15px; padding: 10px 12px; border-radius: 10px; background: var(--paper); border: 1px solid var(--rule); }
.ok-t { color: var(--good); font-weight: 600; } .no-t { color: var(--bad); font-weight: 600; }
.kp-h { margin: 0; font: 600 20px/1.2 var(--f-display); }
.kp { margin: 0; padding-left: 20px; display: grid; gap: 6px; font-size: 15.5px; }
.ls-actions { display: flex; flex-wrap: wrap; gap: 6px; border-top: 1px solid var(--rule); padding-top: 12px; }
.board-frame.noboard .board { opacity: .35; }
.sq.hl::before { content: ""; position: absolute; inset: 0; background: rgba(214, 170, 40, .55); }
.sq.dotmv::after { content: ""; position: absolute; left: 50%; top: 50%; width: 28%; height: 28%; transform: translate(-50%, -50%); border-radius: 50%; background: rgba(46, 150, 120, .85); pointer-events: none; }
label.check { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink-2); cursor: pointer; }
label.check input { accent-color: var(--accent); width: 16px; height: 16px; }

/* sheets */
.sheet { position: fixed; inset: 0; background: rgba(12, 14, 16, .45); display: grid; place-items: center; z-index: 100; padding: 16px; }
.sheet-card { background: var(--panel); border-radius: 16px; box-shadow: var(--shadow); width: min(640px, 100%); max-height: calc(100vh - 32px); overflow-y: auto; padding: 24px; display: grid; gap: 18px; }
.sheet-card h2 { margin: 0; font: 600 24px/1.2 var(--f-display); }
fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 10px; }
legend { font: 500 11px/1.2 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.levels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.level { text-align: left; border: 1px solid var(--rule-2); border-radius: 10px; background: var(--paper); padding: 10px 12px; cursor: pointer; display: grid; gap: 2px; }
.level b { font-size: 14.5px; }
.level span { font: 500 12px/1.2 var(--f-mono); color: var(--muted); }
.level.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); background: var(--accent-soft); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.seg { display: flex; border: 1px solid var(--rule-2); border-radius: 10px; overflow: hidden; }
.seg button { flex: 1; border: 0; background: var(--paper); padding: 9px 8px; cursor: pointer; font-size: 13.5px; border-left: 1px solid var(--rule-2); }
.seg button:first-child { border-left: 0; }
.seg button.on { background: var(--accent); color: var(--accent-ink); }
.sheet-actions { display: flex; justify-content: flex-end; gap: 8px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 13px; color: var(--ink-2); }
.field input, .field select { font: 400 14px/1.3 var(--f-body); color: var(--ink); background: var(--paper); border: 1px solid var(--rule-2); border-radius: 8px; padding: 9px 10px; }

/* progress + review */
.page { max-width: 1100px; margin: 0 auto; padding: 32px 24px 64px; display: grid; gap: 32px; grid-template-columns: minmax(0, 1fr); }
.page > * { min-width: 0; }
.page h1 { margin: 0; font: 600 34px/1.15 var(--f-display); letter-spacing: -.01em; }
.page h2 { margin: 0 0 10px; font: 600 21px/1.2 var(--f-display); }
.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--rule); border-radius: 14px; background: var(--panel); }
.tiles > div { padding: 18px 20px; border-left: 1px solid var(--rule); display: grid; gap: 4px; }
.tiles > div:first-child { border-left: 0; }
.tiles dt { font-size: 13px; color: var(--muted); }
.tiles dd { margin: 0; font: 600 30px/1.1 var(--f-display); font-variant-numeric: tabular-nums; }
.grid2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; }
.bars { display: grid; gap: 12px; }
.bar-row { display: grid; grid-template-columns: 120px minmax(0, 1fr) 52px; gap: 12px; align-items: center; font-size: 14px; }
.bar-row .track { height: 10px; background: var(--rule); border-radius: 5px; overflow: hidden; }
.bar-row .track i { display: block; height: 100%; background: var(--accent); border-radius: 5px; }
.bar-row .v { font: 500 13px/1 var(--f-mono); text-align: right; }
.list { display: grid; gap: 0; border: 1px solid var(--rule); border-radius: 12px; background: var(--panel); overflow: hidden; }
.list > div { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; padding: 12px 16px; border-top: 1px solid var(--rule); align-items: center; font-size: 14px; }
.list > div:first-child { border-top: 0; }
.list .meta { color: var(--muted); font-size: 13px; }
.chip { font: 600 12px/1 var(--f-mono); padding: 5px 8px; border-radius: 999px; background: var(--rule); color: var(--ink-2); }
.chip.win { background: var(--good-soft); color: var(--good); } .chip.loss { background: var(--bad-soft); color: var(--bad); }
.spark { width: 100%; height: 120px; display: block; }
.spark text { font: 500 11px var(--f-mono); fill: var(--muted); }
.empty { border: 1px dashed var(--rule-2); border-radius: 12px; padding: 28px; text-align: center; color: var(--muted); }
.review { max-width: 1320px; margin: 0 auto; padding: 20px 24px 40px; display: grid; grid-template-columns: minmax(0, 1fr) 400px; gap: 28px; align-items: start; }
.review .board-col { max-width: min(640px, calc(100vh - 160px)); }
.moves { font: 500 14px/1.9 var(--f-mono); max-height: 220px; overflow-y: auto; padding: 10px 12px; border: 1px solid var(--rule); border-radius: 10px; background: var(--paper); }
.moves span { cursor: pointer; padding: 2px 4px; border-radius: 4px; }
.moves span.cur { background: var(--accent-soft); }
.moves span.inaccuracy { color: var(--warn); } .moves span.mistake { color: var(--orange); } .moves span.blunder { color: var(--bad); font-weight: 600; }
.km { display: grid; gap: 8px; }
.km button { text-align: left; border: 1px solid var(--rule); background: var(--paper); border-radius: 10px; padding: 10px 12px; cursor: pointer; font-size: 14px; }
.km button.on { border-color: var(--accent); background: var(--accent-soft); }
.rv-h { margin: 4px 0 0; font: 600 24px/1.2 var(--f-display); }
.rv-sum { margin: 0; font: 400 16px/1.6 var(--f-display); }
.rv-acts { display: flex; flex-wrap: wrap; gap: 6px; }
.rv-move { font-size: 15px; line-height: 1.55; background: var(--paper); border: 1px solid var(--rule); border-radius: 10px; padding: 12px 14px; display: grid; gap: 6px; }
.rv-move p { margin: 0; }
.rv-move > span:not(.tag) { display: block; }
.rv-move .tag { justify-self: start; }
.legend { font-size: 12.5px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.lg { display: inline-block; width: 14px; height: 4px; border-radius: 2px; } .lg.bad { background: var(--bad); } .lg.good { background: var(--good); margin-left: 8px; }
.mno { color: var(--muted); font-weight: 500; }
.panel { background: var(--panel); border: 1px solid var(--rule); border-radius: 14px; padding: 18px; display: grid; gap: 14px; }

@media (max-width: 1000px) {
  .home-grid { grid-template-columns: minmax(0, 1fr); }
  .play, .review { grid-template-columns: 1fr; gap: 18px; padding: 12px 16px 28px; }
  .board-col, .review .board-col { max-width: 640px; justify-self: center; }
  .side, .lesson-panel { position: static; }
  .lesson-wrap { grid-template-columns: minmax(0, 1fr); gap: 16px; padding: 12px 16px 28px; }
  .lesson-wrap .board-col { max-width: 560px; justify-self: center; }
  .movelist { max-height: 200px; }
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiles > div:nth-child(3) { border-left: 0; } .tiles > div:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .grid2 { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .top-in { padding: 6px 12px 4px; gap: 4px; flex-wrap: wrap; min-height: 0; }
  .nav { order: 3; width: 100%; justify-content: space-between; border-top: 1px solid var(--rule); padding-top: 4px; }
  .nav a { flex: 1; text-align: center; }
  .brand small { display: none; }
  .voice-btn .vb-l { display: none; }
  .voice-btn { height: 34px; padding: 0 8px; }
  .brand b { font-size: 17px; }
  .brand svg { width: 26px; height: 26px; }
  .nav a { padding: 7px 8px; font-size: 13.5px; }
  .icon-btn { width: 34px; height: 34px; }
  .levels { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .row2 { grid-template-columns: 1fr; }
  .page { padding: 24px 16px 48px; }
  .controls .btn { padding: 8px 10px; font-size: 13px; }
  .acad { padding: 24px 16px 56px; gap: 22px; }
  .lede { font-size: 15.5px; }
  .askbig { padding-left: 12px; }
  .askbig input { font-size: 15px; }
  .continue { flex-direction: column; align-items: stretch; padding: 18px; }
  .home-grid { grid-template-columns: minmax(0, 1fr); }
  .card { padding: 18px; }
  .path-list { margin: 0 -18px -6px; }
  .bands { grid-template-columns: 1fr; }
  .voice-pick { grid-template-columns: 1fr; }
  .plan-row { grid-template-columns: 1fr; gap: 4px; }
  .wz-field.inline { grid-template-columns: 1fr; }
  .wz-acts { flex-wrap: wrap; }
  .wz-go { width: 100%; justify-content: stretch; }
  .wz-go .btn { flex: 1; }
  .welcome { padding: 28px 16px 40px; place-items: start center; }
  .stage summary { grid-template-columns: 32px minmax(0, 1fr) 40px; padding: 14px; gap: 10px; }
  .st-prog { display: none; }
  .st-main b { font-size: 16.5px; }
  .lessons a { grid-template-columns: 36px minmax(0, 1fr) 18px; padding: 10px 14px; }
  .lessons .lm { display: none; }
  .lesson-panel { padding: 18px; }
  .lesson-panel h1 { font-size: 23px; }
  .step-text { font-size: 16.5px; }
  .step-nav .btn { padding: 8px 10px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }
#wz-hear { justify-self: start; }
.all-stages > summary .note { font: 400 13px/1.3 var(--f-body); }


/* ===================== Apple-style layer ===================== */
body { font: 400 16px/1.5 var(--f-body); letter-spacing: -.011em; }
h1, h2, h3 { letter-spacing: -.022em; }
.eyebrow { font: 600 13px/1.3 var(--f-body); letter-spacing: 0; text-transform: none; color: var(--accent); }
.note { font-size: 14px; }

/* frosted top bar */
.top { position: sticky; top: 0; z-index: 50; background: rgba(245, 245, 247, .78); -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid rgba(0, 0, 0, .08); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .top { background: rgba(22, 22, 23, .8); border-bottom-color: rgba(255, 255, 255, .08); } }
.top-in { min-height: 56px; max-width: 1200px; }
.brand svg { width: 28px; height: 28px; }
.brand b { font: 600 19px/1.1 var(--f-display); letter-spacing: -.02em; }
.brand small { font-size: 12px; }
.nav a { font-size: 14px; padding: 7px 14px; border-radius: 980px; color: var(--ink-2); }
.nav a:hover { background: rgba(0, 0, 0, .05); color: var(--ink); }
.nav a[aria-current="page"] { background: var(--ink); color: var(--paper); }
.icon-btn { border-radius: 980px; }
.icon-btn:hover { background: rgba(0, 0, 0, .05); }
.voice-btn { border-radius: 980px; background: transparent; border-color: var(--rule-2); }
.voice-btn .vb-s { font: 600 11px/1 var(--f-body); }

/* buttons: pills */
.btn { border-radius: 980px; padding: 9px 18px; font-weight: 500; font-size: 15px; border: 1px solid var(--rule-2); background: var(--panel); transition: background .15s, border-color .15s, color .15s; }
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--accent); }
.btn.ghost:hover { background: var(--accent-soft); }
.btn.big { padding: 13px 26px; font-size: 16px; border-radius: 980px; }
.btn.sm { padding: 6px 12px; font-size: 14px; }
.btn.danger { color: var(--bad); }

/* cards */
.card, .continue, .stage, .lesson-panel, .side, .panel, .answer, .plan, .list, .tiles, .result { border-radius: 18px; }
.card, .stage, .lesson-panel, .side, .panel, .list, .tiles, .plan { border: 0; box-shadow: var(--shadow); }
.card h2, .page h2, .kp-h { font: 600 20px/1.25 var(--f-display); letter-spacing: -.02em; }

/* home */
.acad { max-width: 1080px; padding: 48px 24px 80px; gap: 28px; }
.greet h1 { font: 700 clamp(34px, 5vw, 52px)/1.06 var(--f-display); letter-spacing: -.03em; }
.greet-sub { font-size: 19px; color: var(--muted); }
.continue { border: 0; border-left: 0; background: var(--ink); color: var(--paper); box-shadow: none; padding: 28px 30px; }
.continue .eyebrow { color: #6cb4ff; }
.continue h2 { font: 600 28px/1.2 var(--f-display); letter-spacing: -.025em; color: #fff; }
.continue .note { color: #a1a1a6; }
.continue .btn.primary { background: var(--accent); border-color: var(--accent); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .continue { background: #1c1c1e; } }
.path-list li.next a { background: var(--accent-soft); }
.lessons a { font-size: 15.5px; }
.lessons .ln { font: 500 13px/1 var(--f-body); color: var(--muted); font-variant-numeric: tabular-nums; }
.lessons .ok { color: var(--accent); }
.chip-q { border-radius: 980px; border-color: var(--rule-2); background: transparent; font-size: 14px; }
.chip-q:hover { border-color: var(--accent); color: var(--accent); }
.card .askbig { border-radius: 980px; padding: 4px 4px 4px 16px; background: var(--paper); border-color: transparent; }
.card .askbig:focus-within { border-color: var(--accent); background: var(--panel); }
.answer { border: 0; border-left: 0; box-shadow: var(--shadow); padding: 24px 26px; position: relative; }
.ans-text { font: 400 18px/1.6 var(--f-body); letter-spacing: -.01em; }
.ans-close { position: absolute; top: 14px; right: 14px; }
.all-stages > summary { font: 600 19px/1.3 var(--f-display); }
.st-n { background: var(--ink); color: var(--paper); font: 600 15px/1 var(--f-body); }
.stage.current .st-n { background: var(--accent); color: #fff; }
.stage.current { box-shadow: 0 0 0 2px var(--accent), var(--shadow); }
.st-main b { font: 600 17px/1.3 var(--f-display); }
.st-prog i, .rv-prog .track i, .bar-row .track i { background: var(--accent); }

/* welcome */
.welcome { background: var(--panel); }
.wz-body h1 { font: 700 clamp(30px, 4.6vw, 44px)/1.08 var(--f-display); letter-spacing: -.03em; }
.wz-lede { font-size: 18px; color: var(--muted); }
.wz-brand { font: 600 20px/1 var(--f-display); letter-spacing: -.02em; justify-content: space-between; }
.wz-brand > span { display: flex; align-items: center; gap: 10px; }
.wz-field input { border-radius: 14px; background: var(--paper); border-color: transparent; font-size: 18px; }
.band, .vp { border-radius: 16px; border-color: var(--rule-2); background: var(--panel); }
.band b, .vp b { font: 600 17px/1.25 var(--f-display); letter-spacing: -.015em; }
.band.on, .vp.on { background: var(--accent-soft); border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.wz-dots i.done, .wz-dots i.now { background: var(--accent); }
.plan { border: 0; background: var(--paper); box-shadow: none; }
.plan-v { font: 600 16px/1.35 var(--f-display); }

/* lesson */
.lesson-bar { max-width: 1200px; margin: 0 auto; padding: 14px 24px 0; display: flex; align-items: center; gap: 14px; }
.lesson-bar .lb-mid { flex: 1; min-width: 0; }
.back-link { display: inline-flex; align-items: center; gap: 4px; color: var(--accent); text-decoration: none; font-size: 15px; font-weight: 500; padding: 6px 4px; }
.back-link:hover { text-decoration: underline; }
.lb-mid { font-size: 14px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ls-count { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.exit-btn { display: inline-flex; align-items: center; gap: 6px; text-decoration: none; color: var(--ink); font-size: 14px; font-weight: 500; padding: 7px 14px; border-radius: 980px; background: var(--panel); box-shadow: var(--shadow); }
.exit-btn:hover { background: var(--ink); color: var(--paper); }
.lesson-wrap { max-width: 1200px; padding-top: 14px; }
.lesson-panel { border: 0; padding: 28px 30px; }
.lesson-panel h1 { font: 700 30px/1.12 var(--f-display); letter-spacing: -.028em; }
.lesson-panel .eyebrow { color: var(--accent); }
.step-text { font: 400 19px/1.6 var(--f-body); letter-spacing: -.012em; }
.dots .dot { width: 8px; height: 8px; padding: 0; border: 0; border-radius: 50%; background: var(--rule-2); cursor: pointer; }
.dots .dot.task { border-radius: 2px; }
.dots .dot.done { background: var(--muted); }
.dots .dot.solved { background: var(--good); }
.dots .dot.now { background: var(--accent); transform: scale(1.4); }
.fb { border-radius: 14px; border: 0; background: var(--paper); }
.opt { border-radius: 14px; background: var(--panel); border-color: var(--rule-2); }
.opt b { font: 600 13px/1.6 var(--f-body); color: var(--accent); }
.opt.right { background: var(--good-soft); border-color: var(--good); }
.line-san { font: 500 14px/1.6 var(--f-mono); }
.ls-actions { border-top: 1px solid var(--rule); }

/* board: white and blue squares, crisp frame */
.board { border-radius: 6px; box-shadow: 0 0 0 1px rgba(0, 0, 0, .12), 0 12px 32px rgba(0, 0, 0, .10); }
.piece .sil-b { fill: #9a9a9a; stroke: #ffffff; stroke-width: 2.4; }
.sq .coord { font: 600 10px/1 var(--f-body); }
.sq.hl::before { background: rgba(255, 204, 0, .58); }
.sq.dotmv::after { background: rgba(0, 0, 0, .35); }
.sq.hint::before { box-shadow: inset 0 0 0 4px #ffcc00; }

/* play + review */
.play { max-width: 1200px; }
.side { border: 0; padding: 22px; }
.opening { font: 600 18px/1.25 var(--f-display); letter-spacing: -.02em; }
.movelist { border: 0; background: var(--paper); border-radius: 14px; font: 500 14px/1.9 var(--f-mono); }
.result { border: 0; background: var(--ink); color: var(--paper); }
.result h2 { color: #fff; font: 700 26px/1.15 var(--f-display); letter-spacing: -.025em; }
.result .note, .result .rv-prog { color: #a1a1a6; }
.result .eyebrow { color: #6cb4ff; }
.result .btn:not(.primary) { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .35); }
.clock { border-radius: 10px; font: 600 18px/1 var(--f-mono); }
.clock.run { background: var(--ink); color: var(--paper); }
.board-col.flipped > .strip:last-child { order: -1; }
.board-col.flipped > .strip:first-child { order: 2; }
.page-back { max-width: 1200px; margin: 0 auto; padding: 14px 24px 0; }
.review { padding-top: 10px; }
.rv-h { font: 700 28px/1.15 var(--f-display); letter-spacing: -.025em; }
.rv-sum { font: 400 17px/1.6 var(--f-body); }
.rv-move { border: 0; background: var(--paper); border-radius: 14px; }
.moves { border: 0; background: var(--paper); border-radius: 14px; }
.km button { border-radius: 14px; border-color: var(--rule); background: var(--panel); }
.km button.on { border-color: var(--accent); background: var(--accent-soft); }
.page h1 { font: 700 clamp(32px, 4.6vw, 46px)/1.08 var(--f-display); letter-spacing: -.03em; }
.tiles { border: 0; background: var(--panel); }
.tiles dd { font: 700 32px/1.1 var(--f-display); letter-spacing: -.02em; }
.level { border-radius: 14px; }
.level b { font-size: 15px; }
.level span { font: 500 12.5px/1.2 var(--f-body); }
.level.on { background: var(--accent-soft); border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.seg { border-radius: 980px; padding: 3px; background: var(--paper); border: 0; gap: 2px; }
.seg button { border: 0; border-radius: 980px; background: transparent; }
.seg button.on { background: var(--panel); color: var(--ink); box-shadow: 0 1px 3px rgba(0, 0, 0, .15); font-weight: 600; }
.sheet { background: rgba(0, 0, 0, .35); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.sheet-card { border-radius: 22px; }
.sheet-card h2 { font: 700 26px/1.2 var(--f-display); letter-spacing: -.025em; }
.sheet-card { max-height: calc(100dvh - 32px); }
legend { font: 600 13px/1.3 var(--f-body); letter-spacing: 0; text-transform: none; color: var(--muted); }
.field input, .field select { border-radius: 12px; background: var(--paper); border-color: transparent; }
.tag { font: 600 11.5px/1 var(--f-body); }

@media (max-width: 1000px) {
  .lesson-bar { padding: 10px 16px 0; }
  .ls-count { display: none; }
}
@media (max-width: 600px) {
  .acad { padding: 28px 16px 56px; }
  .continue { padding: 22px; }
  .continue h2 { font-size: 23px; }
  .lesson-panel { padding: 20px; }
  .lesson-panel h1 { font-size: 25px; }
  .step-text { font-size: 17px; }
  .lesson-bar .lb-mid { visibility: hidden; }
  .nav a[aria-current="page"] { background: var(--ink); color: var(--paper); }
}

/* ===================== Tournament board (DGT-style wood) ===================== */
:root { --sq-light: #ecd4ab; --sq-dark: #a97a52; --coord-l: #a97a52; --coord-d: #ecd4ab; --rim-bg: #3b2415; --rim-ink: #ead6b4;
  --hl-last: rgba(155, 199, 0, .42); --hl-sel: rgba(20, 110, 40, .5); }
:root[data-board="blue"] { --sq-light: #ffffff; --sq-dark: #5b8ac6; --rim-bg: #1d1d1f; --rim-ink: #f5f5f7; --hl-last: rgba(255, 214, 10, .45); --hl-sel: rgba(255, 204, 0, .62); }
:root[data-board="charcoal"] { --sq-light: #ffffff; --sq-dark: #555555; --rim-bg: #1d1d1f; --rim-ink: #f5f5f7; --hl-last: rgba(255, 214, 10, .45); --hl-sel: rgba(255, 204, 0, .62); }
:root:not([data-board]) .sq, :root[data-board="wood"] .sq { background-image: repeating-linear-gradient(92deg, rgba(90, 50, 20, .045) 0 1px, transparent 1px 5px, rgba(90, 50, 20, .03) 5px 7px, transparent 7px 11px); }
:root:not([data-board]) .sq.dark, :root[data-board="wood"] .sq.dark { background-image: repeating-linear-gradient(88deg, rgba(40, 20, 5, .09) 0 1px, transparent 1px 4px, rgba(40, 20, 5, .06) 4px 6px, transparent 6px 10px); }
.board-frame.framed { --rim: 4.4%; background: var(--rim-bg); border-radius: 10px; box-shadow: 0 1px 0 rgba(255, 255, 255, .06) inset, 0 16px 40px rgba(0, 0, 0, .22); }
:root:not([data-board]) .board-frame.framed, :root[data-board="wood"] .board-frame.framed { background: linear-gradient(135deg, #4a2d1a, #2f1c10 60%, #43291a); }
.board-frame.framed .board, .board-frame.framed .board-arrows, .board-frame.framed .promo { top: var(--rim); left: var(--rim); right: var(--rim); bottom: var(--rim); width: auto; height: auto; }
.board-frame.framed .board-arrows { width: calc(100% - 2 * var(--rim)); height: calc(100% - 2 * var(--rim)); }
.board-frame.framed .board { border-radius: 2px; box-shadow: 0 0 0 1px rgba(0, 0, 0, .45); }
.board-frame.framed .sq .coord { display: none; }
.rim { position: absolute; inset: 0; pointer-events: none; font: 600 clamp(8px, 1.3vw, 12px)/1 var(--f-body); color: var(--rim-ink); letter-spacing: .02em; }
.rim .rf { position: absolute; bottom: 0; height: var(--rim); width: calc((100% - 2 * var(--rim)) / 8); left: calc(var(--rim) + var(--i) * (100% - 2 * var(--rim)) / 8); display: grid; place-items: center; text-transform: uppercase; }
.rim .rr { position: absolute; left: 0; width: var(--rim); height: calc((100% - 2 * var(--rim)) / 8); top: calc(var(--rim) + var(--i) * (100% - 2 * var(--rim)) / 8); display: grid; place-items: center; }
.piece.staunton { inset: 0; width: 100%; height: 100%; }
.promo button { background: var(--sq-light); }
.promo button svg.staunton { inset: 4%; width: 92%; height: 92%; }
.engine-state { font: 400 12px/1.4 var(--f-body); }
.store-warn { background: var(--bad); color: #fff; text-align: center; padding: 10px 16px; font-size: 14px; font-weight: 500; }

/* ===================== Home: pure white, the knight rides in ===================== */
body.landing { background: #ffffff; }
#view-home { background: #ffffff; color: #1d1d1f; color-scheme: light; }
.hm { min-height: 100vh; min-height: 100dvh; display: grid; align-content: center; justify-items: center; gap: 14px; padding: 40px 24px; text-align: center; overflow: hidden; }
.hm-stage { width: min(560px, 100%); position: relative; height: 150px; }
.hm-ride { position: absolute; left: 50%; bottom: 10px; width: 132px; height: 132px; margin-left: -66px; }
.hm-knight { width: 100%; height: 100%; display: block; }
.hm-line { position: absolute; left: 0; right: 0; bottom: 8px; height: 2px; background: #1d1d1f; border-radius: 2px; transform-origin: left center; }
.hm-title { margin: 6px 0 0; font: 700 clamp(40px, 7vw, 68px)/1.02 var(--f-display); letter-spacing: -.035em; color: #1d1d1f; }
.hm-sub { margin: 0; font-size: clamp(17px, 2.2vw, 21px); color: #6e6e73; }
.hm-choices { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; width: min(640px, 100%); margin-top: 22px; }
.hm-btn { display: grid; gap: 6px; padding: 22px 22px; border-radius: 22px; text-decoration: none; text-align: left; background: #f5f5f7; color: #1d1d1f; border: 1px solid transparent; transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.hm-btn b { font: 600 22px/1.15 var(--f-display); letter-spacing: -.025em; }
.hm-btn small { font-size: 14px; line-height: 1.4; color: #6e6e73; }
.hm-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(0, 0, 0, .10); }
.hm-btn.primary { background: #0071e3; color: #fff; }
.hm-btn.primary small { color: rgba(255, 255, 255, .82); }
.hm-btn.primary:hover { background: #0066cc; }
.hm-more { margin-top: 10px; color: #0071e3; text-decoration: none; font-size: 15px; }
.hm-more:hover { text-decoration: underline; }
/* sequence: the line draws, the knight rides across from the left, then the words and choices appear */
.hm.go .hm-line { animation: hm-line 1.1s cubic-bezier(.2, .7, .2, 1) both; }
.hm.go .hm-spin { animation: hm-spin 2.4s both, hm-rock 8s ease-in-out 2.4s infinite; }
.hm.go .hm-k { animation: hm-k 2.4s step-end both; }
.hm.go .hm-n { animation: hm-n 2.4s step-end both; }
.hm.go .hm-title { animation: hm-up .7s ease .5s both; }
.hm.go .hm-sub { animation: hm-up .7s ease .7s both; }
.hm.go .hm-choices { animation: hm-up .7s ease .95s both; }
.hm.go .hm-more { animation: hm-up .7s ease 1.2s both; }
@keyframes hm-line { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes hm-ride { 0% { transform: translateX(-70vw); } 78% { transform: translateX(14px); } 100% { transform: translateX(0); } }
@keyframes hm-up { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .hm.go .hm-line, .hm.go .hm-spin, .hm.go .hm-k, .hm.go .hm-n, .hm.go .hm-title, .hm.go .hm-sub, .hm.go .hm-choices, .hm.go .hm-more { animation: none !important; } }

/* ===================== One board: Learn / Analyse ===================== */
.mode-seg { flex: none; background: var(--rule); }
.mode-seg button { padding: 7px 18px; font-size: 14px; cursor: pointer; color: var(--ink-2); }
.mode-seg button.on { color: var(--ink); }
#an-nav { justify-content: center; }
#an-nav .note { min-width: 110px; text-align: center; }
.an-eval { display: grid; gap: 8px; }
.evalbar { height: 12px; border-radius: 6px; background: #1d1d1f; overflow: hidden; border: 1px solid #1d1d1f; }
.evalbar i { display: block; height: 100%; width: 50%; background: #ffffff; transition: width .35s ease; }
.an-evaltext { margin: 0; font: 600 18px/1.3 var(--f-display); letter-spacing: -.02em; }
#an-coach { display: grid; gap: 8px; font-size: 16px; line-height: 1.55; }
#an-coach p { margin: 0; }
.an-lines { display: grid; gap: 6px; margin-top: 8px; }
.an-line { display: grid; grid-template-columns: 58px minmax(0, 1fr); gap: 10px; align-items: baseline; text-align: left; padding: 9px 12px; border: 1px solid var(--rule); border-radius: 12px; background: var(--panel); cursor: pointer; color: var(--ink); }
.an-line:hover { border-color: var(--accent); }
.an-line b { font: 600 14px/1.4 var(--f-mono); }
.an-line span { font: 500 14px/1.5 var(--f-mono); color: var(--ink-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.an-tools { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.an-fen { display: flex; gap: 8px; }
.an-fen input { flex: 1; min-width: 0; font: 400 14px/1.3 var(--f-mono); color: var(--ink); background: var(--paper); border: 1px solid transparent; border-radius: 12px; padding: 9px 12px; outline: none; }
.an-fen input:focus { border-color: var(--accent); }
.an-editor { display: grid; gap: 12px; }
.palette { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; }
.palette button { position: relative; aspect-ratio: 1; border: 1px solid var(--rule-2); border-radius: 12px; background: var(--sq-light); cursor: pointer; padding: 0; }
.palette button svg { position: absolute; inset: 6%; width: 88%; height: 88%; }
.palette button.on { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.palette button.erase { grid-column: 1 / -1; aspect-ratio: auto; padding: 9px; background: var(--panel); font-size: 14px; color: var(--ink); }
#panel-analyse .moves span.cur { background: var(--accent-soft); }
#panel-analyse .moves span.best, #panel-analyse .moves span.good { color: var(--ink); }
@media (max-width: 600px) {
  .hm-choices { grid-template-columns: 1fr; }
  .hm-stage { height: 120px; }
  .hm-3d { --s: 104px; }
  .mode-seg button { padding: 6px 12px; }
  #ls-back { font-size: 14px; }
}
#seg-turn button { white-space: nowrap; font-size: 13.5px; padding: 8px 12px; cursor: pointer; }
#an-nav .btn { white-space: nowrap; }
@media (max-width: 600px) { #an-nav { gap: 6px; } #an-nav .btn { padding: 8px 12px; font-size: 14px; } #an-nav .note { min-width: 0; flex: 1; font-size: 12.5px; } }

/* ===================== Analysis: side evaluation bar, verdict colours ===================== */
.board-row { display: flex; gap: 10px; align-items: stretch; }
.board-row .board-frame { flex: 1; min-width: 0; }
.vbar { flex: none; width: 26px; border-radius: 6px; background: #2b2b2e; position: relative; overflow: hidden; box-shadow: 0 0 0 1px rgba(0, 0, 0, .25); }
.vbar i { position: absolute; left: 0; right: 0; bottom: 0; height: 50%; background: #ffffff; transition: height .45s ease; }
.vbar.flip i { bottom: auto; top: 0; }
.vbar span { position: absolute; left: 0; right: 0; text-align: center; font: 700 10.5px/1 var(--f-body); letter-spacing: -.02em; z-index: 1; }
.vbar span.w { bottom: 6px; color: #1d1d1f; }
.vbar span.b { top: 6px; color: #ffffff; }
.vbar.flip span.w { bottom: auto; top: 6px; }
.vbar.flip span.b { top: auto; bottom: 6px; }
.tag.book { background: #f1e7d8; color: #8a5a1c; }
.tag.excellent { background: var(--good-soft); color: var(--good); }
#panel-analyse .moves span { cursor: pointer; }
#panel-analyse .moves span.book { color: #8a5a1c; }
#panel-analyse .moves span.best, #panel-analyse .moves span.excellent { color: var(--good); }
#panel-analyse .moves span.inaccuracy { color: var(--warn); }
#panel-analyse .moves span.mistake { color: var(--orange); }
#panel-analyse .moves span.blunder { color: var(--bad); font-weight: 700; }
.an-summary { margin: 0; font-size: 15px; line-height: 1.5; }
.an-summary:empty { display: none; }
@media (max-width: 600px) { .vbar { width: 18px; } .vbar span { font-size: 9px; } .board-row { gap: 6px; } }

/* brand wordmark: Knightmotive with a blue K */
.bk { color: var(--accent); }
#view-home .bk { color: #0071e3; }

/* position editor: trays of spare pieces above and below the board */
.ed-tray { display: flex; justify-content: center; gap: 6px; margin: 0; touch-action: none; user-select: none; -webkit-user-select: none; }
.ed-tray button { position: relative; flex: 1 1 0; max-width: 64px; aspect-ratio: 1; border: 1px solid var(--rule-2); border-radius: 12px; background: var(--panel); cursor: grab; padding: 0; color: var(--muted); touch-action: none; -webkit-touch-callout: none; }
.ed-tray button svg.piece, .ed-tray button > svg:not([viewBox="0 0 24 24"]) { position: absolute; inset: 6%; width: 88%; height: 88%; pointer-events: none; }
.ed-tray button.bin svg { pointer-events: none; }
.ed-tray button:hover { border-color: var(--accent); }
.ed-tray button.on { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); background: var(--accent-soft); }
.ed-tray button.bin.on { color: var(--bad); border-color: var(--bad); box-shadow: 0 0 0 2px var(--bad); background: var(--panel); }
#ls-board.ed, #ls-board.ed * { touch-action: none; }
#ls-board.ed [data-sq] { cursor: pointer; }
#ls-board .ed-sel { box-shadow: inset 0 0 0 4px var(--accent); }
.lesson-wrap .board-col.editing { max-width: max(320px, min(640px, calc(100vh - 330px))); }
@media (max-width: 900px) { .lesson-wrap .board-col.editing { max-width: 560px; } }
.ed-tray button.bin { display: grid; place-items: center; }

/* landing emblem: a solid K that spins and becomes a knight */
.hm-3d { --s: 132px; position: absolute; left: 50%; bottom: 14px; width: var(--s); height: var(--s); margin-left: calc(var(--s) / -2); perspective: 620px; }
.hm-tilt, .hm-spin, .hm-obj { position: absolute; inset: 0; transform-style: preserve-3d; }
.hm-tilt { transform: rotateX(-9deg); }
.hm-layer.alt { color: #004a99; }
.hm-layer { position: absolute; inset: 0; display: grid; place-items: center; color: #004a99; }
.hm-layer.front, .hm-layer.back { color: #0071e3; }
.hm-layer svg { width: 100%; height: 100%; display: block; overflow: visible; }
.hm-k span { font: 800 calc(var(--s) * 1.08)/1 var(--f-display); letter-spacing: 0; -webkit-text-stroke: 2px currentColor; }
.hm-k { opacity: 0; }
@keyframes hm-spin {
  0%, 4% { transform: rotateY(0deg); animation-timing-function: cubic-bezier(.45, 0, .75, .7); }
  76% { transform: rotateY(270deg); animation-timing-function: cubic-bezier(.2, .6, .25, 1); }
  100% { transform: rotateY(360deg); }
}
@keyframes hm-rock { 0%, 100% { transform: rotateY(0deg); } 25% { transform: rotateY(22deg); } 75% { transform: rotateY(-22deg); } }
@keyframes hm-k { 0% { opacity: 1; } 76%, 100% { opacity: 0; } }
@keyframes hm-n { 0% { opacity: 0; } 76%, 100% { opacity: 1; } }

/* review card and the coach's bookshelf */
.continue.review-card { background: var(--panel); color: var(--ink); border: 1px solid var(--rule); margin-top: 12px; padding: 20px 24px; }
.continue.review-card h2 { font-size: 20px; }
.shelf { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--rule); }
.shelf ul { list-style: none; margin: 8px 0 8px; padding: 0; display: grid; gap: 10px; }
.shelf li { font-size: 14.5px; line-height: 1.4; }
.shelf li span { color: var(--muted); }
.shelf li small { display: block; color: var(--muted); font-size: 13.5px; }
details.stage .shelf { margin: 6px 16px 16px; }
.continue.review-card h2 { color: var(--ink); }
.continue.review-card .eyebrow { color: var(--accent); }
.continue.review-card .note { color: var(--muted); }

/* level screen: one question */
.wz-rate { display: flex; gap: 10px; }
.wz-rate input { flex: 1; min-width: 0; font: 500 19px/1.3 var(--f-body); color: var(--ink); background: var(--panel); border: 1px solid var(--rule-2); border-radius: 14px; padding: 14px 16px; outline: none; }
.wz-rate input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.wz-rate .btn { flex: none; border-radius: 14px; padding-inline: 22px; }
.wz-body #wz-hint { margin: -8px 0 0; }
.wz-continue { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 16px 18px; border-radius: 16px; background: var(--ink); color: var(--paper); text-decoration: none; }
.wz-continue span { display: grid; gap: 3px; min-width: 0; }
.wz-continue small { font-size: 12.5px; color: #a1a1a6; }
.wz-continue b { font: 600 17px/1.25 var(--f-display); }
.wz-continue i { font-style: normal; flex: none; background: var(--accent); color: #fff; padding: 9px 16px; border-radius: 999px; font-weight: 600; font-size: 14px; }
.wz-or { margin: -6px 0 -6px; text-align: center; color: var(--muted); font-size: 13.5px; }
.wz-voice { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding-top: 6px; border-top: 1px solid var(--rule); font-size: 15px; }
.wz-voice > span:first-child { font-weight: 600; }
.wz-skip { color: var(--accent); text-decoration: none; font: 500 15px/1 var(--f-body); background: none; border: 0; cursor: pointer; }

/* master games: sit in the grandmaster's chair */
.gm-score{margin:10px 0 14px;padding:12px 14px;border:1px solid var(--rule);border-radius:14px;background:var(--panel)}
.gm-nums{display:flex;justify-content:space-between;gap:10px;font-size:13px;color:var(--muted);margin-bottom:8px;flex-wrap:wrap}
.gm-nums b{font-size:20px;color:var(--accent,#0071e3);font-weight:700;margin-right:3px}
.gm-score .track{height:6px;border-radius:3px;background:var(--rule);overflow:hidden}
.gm-score .track i{display:block;height:100%;background:var(--accent,#0071e3);border-radius:3px;transition:width .4s ease}
.gm-btns{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
#gm-note{min-height:3.2em}
.week{border:1px solid var(--rule);border-radius:18px;padding:20px 22px;background:var(--panel)}
.week h2{margin:0 0 4px}
.week ol{margin:12px 0 0;padding:0;list-style:none;display:grid;gap:8px}
.week li{display:grid;grid-template-columns:54px 1fr;gap:12px;align-items:baseline;font-size:15px;line-height:1.45}
.week li b{color:var(--accent,#0071e3);font-weight:600}
.week li a{color:var(--accent,#0071e3);text-decoration:none}

.ls-score{margin-top:14px;padding:12px 14px;border:1px solid var(--rule);border-radius:12px;background:var(--panel);font-size:14px;color:var(--ink-2)}
.ls-score b{color:var(--ink)}.ls-score span{color:var(--accent,#0071e3);font-weight:600}
#ls-again{margin-top:10px}

/* first paint: the landing page shows at once, before the app script has loaded */
.boot-home body{background:#fff}.boot-home .top{display:none}

.linkish{border:0;background:none;padding:0;font:inherit;color:var(--accent,#0071e3);cursor:pointer;text-decoration:underline}

/* analysis engine settings */
.an-set{margin-top:6px;border-top:1px solid var(--rule);padding-top:10px}
.an-set summary{cursor:pointer;font-size:13px;font-weight:600;color:var(--accent,#0071e3);list-style:none}
.an-set summary::-webkit-details-marker{display:none}
.an-set summary::before{content:'⚙ ';}
.an-settings{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 12px;margin-top:12px}
.an-settings label{display:grid;gap:4px;font-size:12px;color:var(--muted)}
.an-settings select{font:inherit;font-size:14px;color:var(--ink);background:var(--panel);border:1px solid var(--rule-2);border-radius:10px;padding:8px 10px;min-width:0;width:100%}
.an-settings select:disabled{opacity:.55}
.an-settings .note{grid-column:1/-1}
@media (max-width:520px){.an-settings{grid-template-columns:1fr}}

.hm-foot{display:flex;gap:18px;margin-top:26px;font-size:13px}
.hm-foot a{color:#86868b;text-decoration:none}.hm-foot a:hover{color:#1d1d1f;text-decoration:underline}
.st-about{margin-top:14px}.st-about a{color:var(--muted)}

.wz-continue small{color:inherit;opacity:.72}

/* Focused practice plans and saved independent skill checks. */
.growth-plan { margin: 16px 0 24px; padding: 22px 24px; border: 1px solid var(--rule); border-radius: 16px; background: var(--panel); }
.growth-plan h2 { font-size: 23px; margin-bottom: 12px; }
.growth-plan p { margin-bottom: 12px; line-height: 1.6; }
.growth-plan .chips { margin: 14px 0; }
@media (max-width: 600px) { .growth-plan { padding: 18px; } .growth-plan h2 { font-size: 21px; } .growth-plan .btn { white-space: normal; text-align: center; } }

.thinking-pad { margin-top: 18px; border-top: 1px solid var(--rule); padding-top: 14px; }
.thinking-pad summary { cursor: pointer; font-weight: 600; margin-bottom: 12px; }
.thinking-pad label { display: block; margin: 12px 0 5px; font-size: 14px; font-weight: 600; }
.thinking-pad textarea { display: block; width: 100%; box-sizing: border-box; border: 1px solid var(--rule); border-radius: 9px; padding: 10px; background: var(--panel); color: var(--ink); font: inherit; font-size: 14px; resize: vertical; }
.thinking-pad .btn { margin-top: 10px; }
.transfer-work { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--rule); }
.transfer-work label { display: flex; gap: 10px; align-items: flex-start; margin: 12px 0; line-height: 1.5; }
.transfer-work input { margin-top: 5px; flex-shrink: 0; }

.pad-before p { overflow-wrap: anywhere; white-space: pre-wrap; }

/* Saved work stays visible in the current path and the full course, including on phones. */
.lessons .lt { min-width: 0; }
.lesson-progress { display: block; margin-top: 5px; color: var(--muted); font: 400 12px/1.45 var(--f-body); }
.lesson-progress-track { display: block; max-width: 180px; height: 4px; margin-top: 6px; border-radius: 3px; background: var(--rule); overflow: hidden; }
.lesson-progress-track i { display: block; height: 100%; background: var(--accent); }
.stage summary { grid-template-columns: 38px minmax(0, 1fr) 120px 82px; }
.st-count b { display: block; color: var(--ink); font-weight: 600; }
.st-count small { display: block; margin-top: 5px; font: 400 11px/1.3 var(--f-body); }
@media (max-width: 860px) { .stage summary { grid-template-columns: 32px minmax(0, 1fr) 76px; } }
@media (max-width: 860px) {
  .top-in { flex-wrap: wrap; }
  .nav { order: 3; width: 100%; justify-content: space-between; }
  .nav a { flex: 1; text-align: center; }
}

/* Learning helpers: visible piece values and small-screen promotion choices. */
.piece-value { position: absolute; left: 3%; bottom: 3%; z-index: 4; display: grid; place-items: center; min-width: 1.3em; height: 1.3em; padding: 0 .12em; border-radius: 50%; color: #fff; background: #243e39; border: 1px solid #f8e7ab; font-size: clamp(9px, 1.25vw, 15px); line-height: 1; font-weight: 800; pointer-events: none; box-shadow: 0 1px 3px #0006; }
.promo .promo-card { width: min(92%, 310px); box-sizing: border-box; background: var(--panel, #fff); color: var(--ink); border-radius: 14px; padding: 10px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; box-shadow: 0 8px 28px #0005; }
.promo-card h3 { grid-column: 1 / -1; margin: 0 0 2px; text-align: center; font-size: clamp(12px, 2vw, 17px); }
.promo .promo-choice { width: 100%; height: auto; min-height: 60px; padding: 4px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; border-radius: 8px; font-size: 12px; background: #f2e7ce; color: #182f29; }
.promo-piece { position: relative; display: block; width: clamp(30px, 7vw, 48px); height: clamp(30px, 7vw, 48px); }
.promo .promo-piece svg { inset: 0; width: 100%; height: 100%; }
.promo .promo-back { grid-column: 1 / -1; width: 100%; height: auto; min-height: 28px; font-size: 12px; padding: 4px; }
.promo button:focus-visible { outline: 3px solid #14765b; outline-offset: 1px; }
.kid-mission, .kid-award { border: 1px solid var(--accent); background: #f4ecd7; color: #224b3c; padding: 10px 12px; border-radius: 12px; font-weight: 700; }
.rule-recap { margin: 10px 0 14px; padding: 10px 12px; border-radius: 10px; background: var(--panel); border: 1px solid var(--rule); }
.rule-recap summary { cursor: pointer; font-weight: 600; }
.rule-recap p { margin: 10px 0 0; line-height: 1.6; }
.move-demo { border-left: 3px solid var(--accent); padding: 0 0 0 12px; margin: 14px 0; }
.demo-controls { display: flex; flex-wrap: wrap; gap: 8px; }
#ls-demo-caption { font-size: 15px; line-height: 1.6; min-height: 3em; }
.opts .opt.ruled-out { opacity: .55; text-decoration: line-through; }
.solution-route { padding-left: 22px; font-size: 14px; line-height: 1.5; }
.solution-route li { margin: 6px 0; }
@media (max-width: 400px) { .promo .promo-card { padding: 7px; gap: 4px; } .promo .promo-choice { min-height: 54px; font-size: 11px; } }

/* Explain the sample behind the accuracy percentages. */
.phase-sample { display: block; font-size: 11px; line-height: 1.4; color: var(--muted); margin-top: 3px; }
.accuracy-context { line-height: 1.6; max-width: 900px; }

/* Progress saving and account controls */
.progress-save{display:flex;justify-content:flex-end;padding:2px max(12px,calc((100vw - 1240px)/2));min-height:30px}
.progress-save .btn{font-size:12px;white-space:normal;text-align:right}
#account-form label,#account-password-change label{display:block;margin:12px 0 5px}
#account-form input:not([type=checkbox]),#account-password-change input{width:100%;max-width:100%;padding:10px;border:1px solid var(--rule);border-radius:8px;background:var(--surface,#fff);color:var(--ink)}
#account-form .chips,#account-password-change .btn{margin-top:12px}
.account-bring{display:flex!important;align-items:flex-start;gap:8px;font-size:13px}
.account-bring input{margin-top:3px;flex-shrink:0}
.skill-state{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--rule)}