/* 枯山水 — design system from the Cyber Zen Garden concept.
   Crimson is the only accent; sakura is the one warm exception and means "right". */
/* Theme tokens. Dark is the original design; light is "washi and sumi ink".
   The garden carries its own: .stage.night (dark tokens) or .stage.day (light), so the preview's
   Day | Night switch works under either theme (docs/DAY_GARDEN.md).
   app.js sets <html data-theme> to "dark" or "light" (System follows the OS). */
:root {
  --font-zen: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --font-cyber: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}
:root, .stage.night {
  color-scheme: dark;
  --void: #050403;
  --ink: #0d0908;
  --ink-2: #161110;
  --ink-3: #1f1715;
  --code: #080605;
  --crimson: #dc2626;
  --crimson-bright: #ef4444;
  --crimson-dim: #8f1d1d;
  --crimson-soft: rgba(220, 38, 38, 0.12);
  --sakura: #ffc4cf;
  --sakura-soft: rgba(255, 196, 207, 0.1);
  --paper: #e8e4dc;
  --ash: #8a8178;
  --ash-2: #5f5852;
  --rule: rgba(232, 228, 220, 0.12);
  --rule-2: rgba(232, 228, 220, 0.22);
  --on-accent: #050403;                       /* text on a crimson fill */
  --glass: rgba(5, 4, 3, 0.92);               /* sticky header */
  --glass-2: rgba(13, 9, 8, 0.96);            /* floating tips */
  --glow-crimson: rgba(239, 68, 68, 0.45);
  --glow-sakura: rgba(255, 196, 207, 0.4);
  --hl: rgba(220, 38, 38, 0.28);              /* current cell / node */
  --hl-seen: rgba(143, 29, 29, 0.35);
  --hl-line: rgba(239, 68, 68, 0.45);
  --hatch: rgba(232, 228, 220, 0.16);
  --hatch-strong: rgba(232, 228, 220, 0.3);
  --select: rgba(220, 38, 38, 0.25);
  --activeline: rgba(232, 228, 220, 0.03);
  --sakura-line: rgba(255, 196, 207, 0.07);
  --trend: rgba(255, 196, 207, 0.35);
  --petal: #ffc4cf;
  --petal-edge: #ef4444;
  --scroll-thumb: #8f1d1d;                    /* scrollbars: a hairline in the theme's accent */
  --scroll-thumb-hover: #ef4444;
  --hud-bg: rgba(5, 4, 3, 0.6);               /* garden HUD: tags and buttons */
  --hud-tip: rgba(5, 4, 3, 0.85);
  --hud-card: rgba(13, 9, 8, 0.92);
  --hud-title-glow: rgba(220, 38, 38, 0.55);
  --vignette: rgba(0, 0, 0, 0.6);
  --familiar: #c24a4a;
  --warn: #e0a53c;
  --warn-line: #c07f10;
  --wall-a: #1f1715;
  --wall-b: #050403;
  --tok-k: #ef6b6b;
  --tok-s: #d9c7a7;
  --tok-n: #ffc4cf;
  --tok-c: #6b625a;
  --tok-f: #f3d7d9;
  --tok-b: #c9a38f;
  /* journal heatmap: --heat-0 is "no activity" (a quiet neutral, not a step); 1..5 are the ramp,
     checked with the dataviz ordinal validator on both page surfaces */
  --heat-0: #231a18; --heat-1: #7a2526; --heat-2: #a3292a; --heat-3: #cc3434; --heat-4: #f06a6a; --heat-5: #ffc4cf;
}
:root[data-theme="light"], .stage.day {
  color-scheme: light;
  --void: #f4efe6;
  --ink: #fbf8f2;
  --ink-2: #ece5d8;
  --ink-3: #e2d9ca;
  --code: #f8f4ec;
  --crimson: #c42a2a;
  --crimson-bright: #a91b1b;
  --crimson-dim: #dda3a0;
  --crimson-soft: rgba(196, 42, 42, 0.09);
  --sakura: #9a3556;
  --sakura-soft: rgba(154, 53, 86, 0.09);
  --paper: #1f1a17;
  --ash: #675e56;
  --ash-2: #8d837a;
  --rule: rgba(31, 26, 23, 0.12);
  --rule-2: rgba(31, 26, 23, 0.24);
  --on-accent: #ffffff;
  --glass: rgba(244, 239, 230, 0.92);
  --glass-2: rgba(251, 248, 242, 0.97);
  --glow-crimson: transparent;
  --glow-sakura: transparent;
  --hl: rgba(196, 42, 42, 0.16);
  --hl-seen: rgba(196, 42, 42, 0.08);
  --hl-line: rgba(169, 27, 27, 0.45);
  --hatch: rgba(31, 26, 23, 0.16);
  --hatch-strong: rgba(31, 26, 23, 0.3);
  --select: rgba(196, 42, 42, 0.16);
  --activeline: rgba(31, 26, 23, 0.035);
  --sakura-line: rgba(154, 53, 86, 0.07);
  --trend: rgba(154, 53, 86, 0.4);
  --petal: #f4a6b8;
  --petal-edge: #9a3556;
  --scroll-thumb: rgba(31, 26, 23, 0.3);
  --scroll-thumb-hover: rgba(31, 26, 23, 0.6);
  --hud-bg: rgba(244, 239, 230, 0.72);
  --hud-tip: rgba(251, 248, 242, 0.94);
  --hud-card: rgba(251, 248, 242, 0.94);
  --hud-title-glow: transparent;
  --vignette: rgba(110, 92, 74, 0.22);
  --familiar: #b5413b;
  --warn: #8a5a00;
  --warn-line: #b07a14;
  --wall-a: #9c9083;
  --wall-b: #b9ae9f;
  --tok-k: #b3261e;
  --tok-s: #6b5a2e;
  --tok-n: #9a3556;
  --tok-c: #8d837a;
  --tok-f: #7a2e3a;
  --tok-b: #8a5634;
  --heat-0: #e3dacc; --heat-1: #cc6f6c; --heat-2: #bb4440; --heat-3: #9b2a28; --heat-4: #731d1e; --heat-5: #471212;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-gutter: stable; }

/* Scrollbars: a thin hairline thumb on a clear track, in every scroll area (page, editor, logs, tables).
   Firefox takes the standard properties; Chrome and Safari the pseudo-elements, where the transparent
   border insets the thumb to a 4px line that thickens on hover. Square ends, like the rest of the design. */
@supports not selector(::-webkit-scrollbar) {
  * { scrollbar-width: thin; scrollbar-color: var(--scroll-thumb) transparent; }
}
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track, ::-webkit-scrollbar-corner { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scroll-thumb); background-clip: padding-box; border: 3px solid transparent; }
::-webkit-scrollbar-thumb:hover { background: var(--scroll-thumb-hover); background-clip: padding-box; border-width: 2px; }
body { margin: 0; background: var(--void); color: var(--paper); font: 400 14px/1.7 var(--font-cyber); }
::selection { background: var(--crimson); color: var(--on-accent); }
a { color: var(--crimson-bright); }
code { font-family: var(--font-cyber); font-size: 0.92em; background: var(--ink-2); border: 1px solid var(--rule); padding: 0 5px; }
[hidden] { display: none !important; }
button { font: inherit; color: inherit; }
button:focus-visible, input:focus-visible, textarea:focus-visible, a:focus-visible {
  outline: 2px solid var(--crimson-bright); outline-offset: 2px;
}
.muted { color: var(--ash); }

/* ---------- top bar ---------- */
.top { position: sticky; top: 0; z-index: 20; background: var(--glass); backdrop-filter: blur(4px); border-bottom: 1px solid var(--rule); }
.top-inner { max-width: 1120px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.brand { font-family: var(--font-zen); font-weight: 700; font-size: 18px; color: var(--paper); text-decoration: none; letter-spacing: 0.04em; text-shadow: 0 0 14px var(--glow-crimson); }
.brand small { font-family: var(--font-cyber); font-size: 10px; font-weight: 500; letter-spacing: 0.22em; color: var(--crimson-bright); margin-left: 8px; text-shadow: none; }
.nav { display: flex; gap: 2px; }
.nav a { color: var(--ash); text-decoration: none; padding: 4px 10px; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; border: 1px solid transparent; }
.nav a:hover { color: var(--paper); }
.nav { position: relative; }
.nav a[aria-current="page"] { color: var(--paper); }
/* the profile chip: right end of the header */
.me { margin-left: auto; flex: none; display: inline-flex; align-items: center; gap: 8px; padding: 3px 10px 3px 3px; color: var(--ash); text-decoration: none;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; border: 1px solid var(--rule); }
.me:hover, .me[aria-current="page"] { color: var(--paper); border-color: var(--crimson); }
.me-av { display: inline-grid; place-items: center; width: 22px; height: 22px; background: var(--ink-2); color: var(--crimson-bright);
  font: 700 10px var(--font-cyber); letter-spacing: 0.04em; border: 1px solid var(--rule-2); }
.me-name { max-width: 14ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-ink { position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--crimson-bright); pointer-events: none;
  transition: left 0.32s cubic-bezier(.3,.7,.2,1), width 0.32s cubic-bezier(.3,.7,.2,1), opacity 0.2s; }

.wrap { max-width: 900px; margin: 0 auto; padding: 28px 20px 90px; }
.wrap.wide { max-width: 1120px; }

/* ---------- type ---------- */
.kicker { font-size: 11px; letter-spacing: 0.28em; text-transform: uppercase; color: var(--crimson-bright); margin: 0 0 8px; }
.title { font-family: var(--font-zen); font-weight: 700; font-size: clamp(24px, 4vw, 32px); line-height: 1.25; margin: 0 0 6px; text-wrap: balance; }
.subtitle { color: var(--ash); margin: 0 0 28px; max-width: 68ch; }
.h2 { font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--crimson-bright); margin: 0 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--rule); display: flex; justify-content: space-between; gap: 12px; }
.h2 small { color: var(--ash); letter-spacing: 0.14em; }
.prose p { margin: 0 0 12px; max-width: 70ch; }
.prose ul, .prose ol { margin: 0 0 12px; padding-left: 20px; }
.prose b { color: var(--paper); font-weight: 700; }
.prose pre { margin: 8px 0 12px; }
.prose table { border-collapse: collapse; font-size: 12.5px; margin-bottom: 10px; }
.prose td, .prose th { border: 1px solid var(--rule); padding: 3px 8px; text-align: left; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer; text-decoration: none;
  font: 500 11px var(--font-cyber); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--paper); background: var(--ink); border: 1px solid var(--rule-2); padding: 8px 14px;
  transition: border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { border-color: var(--crimson); color: var(--crimson-bright); }
.btn.primary { background: var(--crimson); border-color: var(--crimson); color: var(--on-accent); font-weight: 700; }
.btn.primary:hover { background: var(--crimson-bright); color: var(--on-accent); box-shadow: 0 0 16px var(--glow-crimson); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--ash); }
.btn.ghost:hover { color: var(--paper); border-color: var(--rule); }
.btn:disabled { opacity: 0.35; cursor: default; box-shadow: none; }
.btn:disabled:hover { border-color: var(--rule-2); color: var(--paper); }
.btn.primary:disabled:hover { background: var(--crimson); color: var(--on-accent); }
.btn.big { padding: 11px 20px; font-size: 12px; }
kbd { font: 500 9px var(--font-cyber); border: 1px solid currentColor; padding: 0 4px; opacity: 0.6; letter-spacing: 0; }

/* ---------- garden stage ---------- */
.stage { position: relative; width: 100%; height: min(64vh, 620px); min-height: 380px; background: var(--void); color: var(--paper); overflow: hidden; border-bottom: 1px solid var(--rule); }
.stage canvas { display: block; width: 100%; height: 100%; cursor: grab; touch-action: pan-y; }
#stage-slot.expanded .stage canvas { touch-action: none; }
.stage canvas.pointing { cursor: pointer; }
.stage canvas:active { cursor: grabbing; }
.scanlines { position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(to bottom, transparent 0, transparent 2px, rgba(0, 0, 0, 0.18) 3px); mix-blend-mode: multiply; }
.vignette { position: absolute; inset: 0; pointer-events: none; background: radial-gradient(ellipse at 50% 45%, transparent 40%, var(--vignette) 100%); }
/* day: washi paper grain in place of scanlines (greyscale noise, multiplied in) */
.grain { position: absolute; inset: 0; pointer-events: none; opacity: 0.35; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E"); }
.hud { position: absolute; inset: 0; pointer-events: none; display: flex; flex-direction: column; justify-content: space-between; padding: 20px; }
.hud-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.hud-title { font-family: var(--font-zen); font-weight: 700; font-size: clamp(20px, 3.2vw, 30px); letter-spacing: 0.04em; line-height: 1.2; text-shadow: 0 0 18px var(--hud-title-glow); }
.hud-title small { display: block; font-family: var(--font-cyber); font-size: 11px; font-weight: 500; color: var(--crimson-bright); letter-spacing: 0.24em; text-transform: uppercase; margin-top: 4px; text-shadow: none; }
.hud-tags { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.hud-tag { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ash); border: 1px solid var(--rule); padding: 5px 9px; background: var(--hud-bg); backdrop-filter: blur(2px); white-space: nowrap; }
.hud-tag b { color: var(--paper); font-weight: 500; }
.hud-hint { font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash); }
.hud .btn { pointer-events: auto; }
.hud-bottom { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; flex-wrap: wrap; }
.tip { position: absolute; pointer-events: none; font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--paper); background: var(--hud-tip); border: 1px solid var(--rule-2); padding: 4px 8px; white-space: nowrap; transform: translate(12px, -50%); }
.stone-card { pointer-events: auto; background: var(--hud-card); border: 1px solid var(--rule-2); border-left: 2px solid var(--crimson); padding: 12px 14px; min-width: 240px; max-width: 320px; backdrop-filter: blur(3px); }
.stone-card .name { font-family: var(--font-zen); font-size: 18px; font-weight: 700; margin-bottom: 2px; }
.stone-card .meta { font-size: 11px; color: var(--ash); margin-bottom: 10px; }
.stone-card .row { display: flex; gap: 8px; flex-wrap: wrap; }
.stone-card .close { float: right; background: none; border: 0; color: var(--ash); cursor: pointer; font-size: 14px; line-height: 1; padding: 0 0 0 8px; }
.garden-fallback { padding: 40px 20px; text-align: center; color: var(--ash); }

/* ---------- dashboard ---------- */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin: 0 0 32px; }
.stat { background: var(--ink); padding: 14px 16px; }
.stat b { display: block; font-family: var(--font-zen); font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat span { font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); }
.tier { margin-bottom: 30px; }
.topics { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.topic { background: var(--ink); display: grid; grid-template-columns: minmax(0, 1fr) 150px auto; align-items: center; gap: 18px; padding: 12px 16px; }
.topic:hover { background: var(--ink-2); }
.topic .name { font-size: 14px; color: var(--paper); }
.topic .blurb { font-size: 12px; color: var(--ash); }
.topic .count { font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ash-2); font-variant-numeric: tabular-nums; }
.topic .count .due { color: var(--crimson-bright); }
.topic .count .learned { color: var(--sakura); }
.topic .acts { display: flex; gap: 6px; }

/* mastery meter */
.meter { display: flex; flex-direction: column; gap: 5px; }
.meter .segs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 3px; }
.meter .segs i { height: 4px; background: var(--rule); transition: background 0.4s, box-shadow 0.4s; }
.meter .lbl { font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; display: flex; justify-content: space-between; gap: 8px; }
.lv-0 .lbl { color: var(--ash-2); }
.lv-1 .segs i:nth-child(-n+1) { background: var(--ash); }
.lv-1 .lbl { color: var(--ash); }
.lv-2 .segs i:nth-child(-n+2) { background: var(--crimson-dim); }
.lv-2 .lbl { color: var(--familiar); }
.lv-3 .segs i:nth-child(-n+3) { background: var(--crimson-bright); box-shadow: 0 0 6px var(--glow-crimson); }
.lv-3 .lbl { color: var(--crimson-bright); }
.lv-4 .segs i { background: var(--sakura); box-shadow: 0 0 8px var(--glow-sakura); }
.lv-4 .lbl { color: var(--sakura); }

@media (max-width: 640px) {
  .topic { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .topic .meter { grid-row: 2; }
  .topic .acts { grid-row: 3; }
  .topic .acts .btn { flex: 1; justify-content: center; }
  .stat b { font-size: 19px; }
  .hud-hint { display: none; }
}

/* ---------- practice ---------- */
.bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.crumbs { display: flex; align-items: center; gap: 10px; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; }
.crumbs a { text-decoration: none; color: var(--ash); }
.crumbs a:hover { color: var(--crimson-bright); }
.crumbs b { color: var(--paper); font-weight: 500; }
.bar .meter { width: 200px; }
.bar .meter .lbl span:first-child { color: var(--paper); }

.card { position: relative; background: var(--ink); border: 1px solid var(--rule); padding: 22px 24px; }
.qmeta { font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--crimson-bright); margin-bottom: 10px; }
.qmeta .why { color: var(--ash); }
.prompt { margin: 0 0 16px; font-size: 15.5px; color: var(--paper); max-width: 72ch; }

pre { margin: 0 0 18px; overflow-x: auto; background: var(--code); color: var(--paper); border: 1px solid var(--rule); border-left: 2px solid var(--crimson-dim); padding: 13px 16px; font: 400 13px/1.65 var(--font-cyber); tab-size: 4; }
pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.tk { color: var(--tok-k); } .ts { color: var(--tok-s); } .tc { color: var(--tok-c); font-style: italic; }
.tn { color: var(--tok-n); } .tf { color: var(--tok-f); } .tb { color: var(--tok-b); }

.blank { font: inherit; color: var(--paper); background: var(--ink-2); border: 1px solid var(--crimson); padding: 0 4px; margin: -1px 0; max-width: 100%; }
.blank:disabled { opacity: 1; }
.blank.ok, .answer.ok { border-color: var(--sakura); background: var(--sakura-soft); color: var(--sakura); }
.blank.bad, .answer.bad { border-color: var(--crimson); background: var(--crimson-soft); }

.lines { list-style: none; margin: 0 0 18px; padding: 8px 0; background: var(--code); border: 1px solid var(--rule); font: 400 13px/1.65 var(--font-cyber); overflow-x: auto; }
.lines button { display: flex; width: 100%; min-width: max-content; text-align: left; background: none; border: 0; border-left: 2px solid transparent; cursor: pointer; padding: 0 16px 0 0; color: var(--paper); font: inherit; white-space: pre; }
.lines button:hover { background: var(--ink-3); }
.lines .no { display: inline-block; width: 3.4em; padding-right: 1em; text-align: right; color: var(--ash-2); user-select: none; flex: none; }
.lines button[aria-pressed="true"] { background: var(--crimson-soft); border-left-color: var(--crimson); }
.lines button.right { background: var(--sakura-soft); border-left-color: var(--sakura); }
.lines button.wrong { background: var(--crimson-soft); border-left-color: var(--crimson); }

.opts { display: flex; flex-direction: column; gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin-bottom: 18px; }
.opt { display: flex; align-items: flex-start; gap: 12px; text-align: left; cursor: pointer; background: var(--ink); border: 0; border-left: 2px solid transparent; padding: 11px 14px; color: var(--paper); }
.opt:hover { background: var(--ink-2); }
.opt .k { font-size: 10px; color: var(--ash); border: 1px solid var(--rule-2); min-width: 22px; text-align: center; margin-top: 2px; }
.opt[aria-pressed="true"] { background: var(--crimson-soft); border-left-color: var(--crimson); }
.opt.right { background: var(--sakura-soft); border-left-color: var(--sakura); color: var(--sakura); }
.opt.wrong { background: var(--crimson-soft); border-left-color: var(--crimson); }
.opt:disabled { cursor: default; }

.answer { width: 100%; font: 400 14px var(--font-cyber); color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule-2); padding: 10px 12px; margin-bottom: 18px; }
.answer::placeholder, textarea::placeholder { color: var(--ash-2); }

.actions { display: flex; gap: 8px; justify-content: flex-end; align-items: center; flex-wrap: wrap; }
.actions .note { margin-right: auto; font-size: 11px; color: var(--ash); }

.hintbox { margin: 0 0 16px; padding: 10px 14px; background: var(--ink-2); border-left: 2px solid var(--crimson-dim); }
.who { font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--crimson-bright); display: block; margin-bottom: 2px; }

/* feedback */
.feedback { position: relative; margin-top: 12px; background: var(--ink); border: 1px solid var(--rule); border-left: 2px solid var(--rule-2); padding: 18px 22px; overflow: hidden; }
.feedback.ok { border-left-color: var(--sakura); }
.feedback.bad { border-left-color: var(--crimson); }
.verdict { display: flex; align-items: baseline; gap: 12px; margin-bottom: 10px; font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase; }
.feedback.ok .verdict { color: var(--sakura); text-shadow: 0 0 12px var(--glow-sakura); }
.feedback.bad .verdict { color: var(--crimson-bright); }
.levelup { margin-left: auto; font-size: 10px; letter-spacing: 0.16em; color: var(--ash); }
.feedback p { margin: 0 0 10px; max-width: 72ch; }
.feedback .fix pre { margin: 4px 0 12px; }
.feedback .detail { font-size: 12px; color: var(--crimson-bright); }
.fb-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.fb-actions .spacer { flex: 1; }

/* tutor chat (practice + lessons) */
.tutor { margin-top: 16px; border-top: 1px dashed var(--rule); padding-top: 14px; }
.msg { margin-bottom: 14px; }
.msg .who { color: var(--ash); }
.msg.assistant .who { color: var(--crimson-bright); }
.msg .body p { margin: 0 0 8px; }
.msg .body pre { margin: 6px 0 10px; }
.msg .body ul, .msg .body ol { margin: 0 0 8px; padding-left: 20px; }
.wait { color: var(--ash); font-style: italic; }
.ask { display: flex; gap: 8px; align-items: flex-end; }
.ask textarea { flex: 1; font: inherit; color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule-2); padding: 8px 10px; resize: vertical; min-height: 40px; }
.cards { margin-top: 16px; border-top: 1px dashed var(--rule); padding-top: 14px; }
.cards h3 { font-family: var(--font-zen); margin: 0 0 6px; font-size: 17px; }
.cards .card-body { margin-bottom: 18px; font-size: 13px; }

.empty { text-align: center; color: var(--ash); padding: 60px 0; }
.shortcuts { margin-top: 20px; font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash-2); text-align: center; }

/* petals on a correct answer */
.petal { position: absolute; top: -12px; width: 12px; height: 14px; pointer-events: none; z-index: 2; animation: fall 2.6s ease-in forwards; }
@keyframes fall {
  0% { transform: translate(0, 0) rotate(0deg); opacity: 0; }
  10% { opacity: 1; }
  100% { transform: translate(var(--dx, 30px), 160px) rotate(var(--rot, 220deg)); opacity: 0; }
}

/* ---------- lessons ---------- */
.lesson-head { margin-bottom: 22px; }
.lesson-parts { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: -8px 0 18px; padding-bottom: 10px; border-bottom: 1px solid var(--rule); font-size: 12px; }
.lesson-parts a { color: var(--ash); text-decoration: none; }
.lesson-parts a:hover { color: var(--paper); }
.lesson-parts a.done { color: var(--sakura); }
.lesson-parts b { color: var(--paper); font-weight: 500; border-bottom: 1px solid var(--crimson-bright); }
.lesson-intro { margin-bottom: 26px; padding: 16px 20px; background: var(--ink); border: 1px solid var(--rule); }
.lesson-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
@media (max-width: 900px) { .lesson-grid { grid-template-columns: 1fr; } }
.panel { background: var(--ink); border: 1px solid var(--rule); padding: 14px 16px; min-width: 0; }
.panel .h2 { margin-bottom: 10px; }
.codeview { list-style: none; margin: 0; padding: 8px 0; background: var(--code); border: 1px solid var(--rule); font: 400 13px/1.7 var(--font-cyber); overflow-x: auto; }
.codeview li { display: flex; white-space: pre; padding-right: 16px; border-left: 2px solid transparent; min-width: max-content; }
.codeview .no { display: inline-block; width: 3.2em; padding-right: 1em; text-align: right; color: var(--ash-2); user-select: none; flex: none; }
.codeview li.cur { background: var(--crimson-soft); border-left-color: var(--crimson-bright); }
.codeview li.cur .no { color: var(--crimson-bright); }
.codeview li.done { color: var(--ash); }

.views { display: flex; flex-direction: column; gap: 16px; }
.view .vlabel { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ash); margin-bottom: 6px; }
.undef { color: var(--ash-2); font-size: 12px; }
.arr { display: flex; flex-wrap: wrap; gap: 0; padding-top: 22px; position: relative; }
.cellwrap { position: relative; display: flex; flex-direction: column; align-items: center; min-width: 38px; }
.cell { min-width: 38px; height: 38px; padding: 0 6px; display: grid; place-items: center; border: 1px solid var(--rule-2); margin-left: -1px; background: var(--ink-2); font-size: 13px; transition: background 0.25s, border-color 0.25s, color 0.25s; }
.cellwrap:first-child .cell { margin-left: 0; }
.cell.win { background: var(--crimson-soft); border-color: var(--hl-line); position: relative; z-index: 1; }
.cell.chg { color: var(--sakura); border-color: var(--sakura); box-shadow: inset 0 0 0 1px var(--sakura); position: relative; z-index: 2; }
.cell.ghost { background: transparent; border-style: dashed; color: var(--ash-2); }
.idx { font-size: 9px; color: var(--ash-2); margin-top: 3px; }
.ptrs { position: absolute; top: -21px; display: flex; gap: 3px; white-space: nowrap; }
.ptr { font-size: 10px; color: var(--crimson-bright); letter-spacing: 0.04em; }
.ptr::after { content: "▾"; margin-left: 1px; }
.sub { font-size: 10px; color: var(--ash); margin-top: 1px; }

.kv { display: flex; flex-direction: column; gap: 1px; background: var(--rule); border: 1px solid var(--rule); max-width: 360px; }
.kv .row { display: grid; grid-template-columns: minmax(60px, auto) 1fr; gap: 12px; background: var(--ink-2); padding: 3px 10px; font-size: 12.5px; transition: background 0.25s, color 0.25s; }
.kv .row .k { color: var(--ash); }
.kv .row.chg { color: var(--sakura); background: var(--sakura-soft); }
.kv .row.empty-row { color: var(--ash-2); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--rule-2); padding: 3px 9px; font-size: 12.5px; background: var(--ink-2); transition: color 0.25s, border-color 0.25s; }
.chip .n { color: var(--ash); margin-right: 6px; }
.chip.chg { color: var(--sakura); border-color: var(--sakura); }

.grid { display: inline-grid; gap: 2px; }
.gcell { width: 34px; height: 34px; background: var(--ink-2); border: 1px solid var(--rule); display: grid; place-items: center; font-size: 10px; color: var(--ash-2); transition: background 0.25s, border-color 0.25s; }
.gcell.wall { background: repeating-linear-gradient(45deg, var(--wall-a) 0 4px, var(--wall-b) 4px 8px); border-color: var(--wall-a); }
.gcell.seen { background: var(--hl-seen); border-color: var(--crimson-dim); }
.gcell.queued { border-color: var(--crimson-bright); box-shadow: inset 0 0 0 1px var(--crimson-bright); }
.gcell.probe { outline: 1px dashed var(--paper); outline-offset: -4px; }
.gcell.cur { background: var(--crimson); border-color: var(--crimson-bright); color: var(--on-accent); box-shadow: 0 0 10px var(--glow-crimson); }
.gcell.goal::after { content: "◎"; color: var(--sakura); font-size: 14px; }
.gcell.cur.goal::after { color: var(--on-accent); }

/* call stack */
.calls { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 3px; font-size: 12.5px; }
.calls li { border: 1px solid var(--rule); border-left: 2px solid var(--ash-2); background: var(--ink-2); padding: 2px 10px; width: fit-content; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.calls li .k { color: var(--ash); }
.calls li.top { border-left-color: var(--crimson-bright); color: var(--paper); box-shadow: 0 0 10px var(--glow-crimson); }
.ret { margin-top: 6px; font-size: 12px; color: var(--ash); }
.ret b { color: var(--sakura); font-weight: 500; }

/* svg structures: tree, linked list, graph */
.treeview, .linkview, .graphview { width: 100%; height: auto; display: block; overflow: visible; }
.treeview .edge { stroke: var(--crimson-dim); stroke-width: 1.5; }
.treeview circle, .graphview circle { fill: var(--ink-2); stroke: var(--ash-2); stroke-width: 1.5; transition: fill 0.25s, stroke 0.25s; }
.linkview rect { fill: var(--ink-2); stroke: var(--ash-2); stroke-width: 1.5; }
.treeview .val, .linkview .val, .graphview .val { fill: var(--paper); font: 500 12.5px var(--font-cyber); }
.plabel { fill: var(--crimson-bright); font: 500 10.5px var(--font-cyber); }
.nil { fill: var(--ash-2); font: 12px var(--font-cyber); }
.tnode.done circle, .gnode.done circle { stroke: var(--sakura); }
.tnode.done .val, .gnode.done .val { fill: var(--sakura); }
.tnode.ptr circle, .gnode.cur circle, .lnode.ptr rect { fill: var(--hl); stroke: var(--crimson-bright); }
.gnode.queued circle { stroke: var(--crimson-bright); stroke-dasharray: 4 3; }
.gnode.probe circle { stroke: var(--paper); stroke-dasharray: 2 3; }
.lnode.none rect { fill: transparent; stroke-dasharray: 4 3; }
.lnode.none .val { fill: var(--ash-2); }
.arrow { stroke: var(--ash); stroke-width: 1.5; fill: none; }
.arrow.back { stroke: var(--sakura); }
.arrow.hot { stroke: var(--crimson-bright); stroke-width: 2; }
.arrow.nil { stroke: var(--ash-2); }
.ahead { fill: var(--ash); }
.badge { fill: var(--ash); font: 500 10px var(--font-cyber); }
.lesson-out { margin: 0; padding: 8px 10px; background: var(--code); border: 1px solid var(--rule); font: 400 12.5px/1.6 var(--font-cyber); white-space: pre-wrap; color: var(--paper); }
.wlabel { fill: var(--ash); font: 500 10.5px var(--font-cyber); }
.tnode.chg circle { stroke: var(--crimson-bright); }
.heapview { margin-bottom: 8px; }

/* dp table */
.dptable { border-collapse: collapse; font-size: 12.5px; font-variant-numeric: tabular-nums; }
.dptable th, .dptable td { width: 34px; height: 30px; text-align: center; border: 1px solid var(--rule); }
.dptable th { border-color: transparent; }
.dptable th.lbl { color: var(--ash); font-weight: 500; }
.dptable th.lbl.on { color: var(--crimson-bright); }
.dptable td { background: var(--ink-2); transition: background 0.25s, color 0.25s; }
.dptable td.base { color: var(--ash-2); }
.dptable td.dep { outline: 1px dashed var(--paper); outline-offset: -3px; }
.dptable td.cur { background: var(--hl); outline: 1px solid var(--crimson-bright); outline-offset: -1px; }
.dptable td.chg { color: var(--sakura); }
.dptable.matrix td { width: 38px; height: 34px; }
.chip .bin { color: var(--ash); margin-left: 8px; letter-spacing: 0.08em; }
.cp-opts .btn { text-transform: none; letter-spacing: 0.02em; font-size: 12.5px; }

.controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 16px 0 12px; }
.controls .pos { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ash); margin: 0 6px; font-variant-numeric: tabular-nums; }
.scrub { flex: 1; min-width: 120px; accent-color: var(--crimson); }

.narr { background: var(--ink); border: 1px solid var(--rule); padding: 16px 18px; }
.narr .note { border-left: 2px solid var(--crimson-dim); padding: 2px 0 2px 12px; margin-bottom: 12px; }
.narr .note.end { border-left-color: var(--sakura); }
.narr .quiet { color: var(--ash); font-size: 12.5px; margin-bottom: 12px; }
.checkpoint { border: 1px solid var(--crimson); background: var(--crimson-soft); padding: 12px 14px; margin-bottom: 14px; }
.checkpoint .who { color: var(--crimson-bright); }
.checkpoint p { margin: 2px 0 10px; }
.checkpoint .row { display: flex; gap: 8px; flex-wrap: wrap; }
.checkpoint input { flex: 1; min-width: 160px; font: 400 14px var(--font-cyber); color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule-2); padding: 7px 10px; }
.checkpoint.ok { border-color: var(--sakura); background: var(--sakura-soft); }
.checkpoint.ok .who { color: var(--sakura); }
.checkpoint .res { margin-top: 8px; font-size: 13px; }
.narr-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.tryit { margin-top: 18px; }
.tryit summary { cursor: pointer; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--crimson-bright); }
.tryit textarea { width: 100%; min-height: 80px; margin: 10px 0 8px; font: 400 13px/1.6 var(--font-cyber); color: var(--paper); background: var(--code); border: 1px solid var(--rule-2); padding: 10px 12px; resize: vertical; }
.tryit .err { color: var(--crimson-bright); font-size: 12px; margin-top: 6px; }
.trace-err { color: var(--crimson-bright); font-size: 12px; margin-top: 8px; }
.lesson-end { margin-top: 18px; display: flex; gap: 8px; flex-wrap: wrap; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .petal { display: none; }
  .cell, .gcell, .chip, .kv .row, .meter .segs i { transition: none; }
}
@media (hover: none) and (pointer: coarse) { .shortcuts, kbd { display: none; } }

/* ---------- problems list ---------- */
.coverage { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin-bottom: 22px; }
.cov { background: var(--ink); padding: 12px 16px; }
.cov .lbl { font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); display: flex; justify-content: space-between; }
.cov .bar2 { height: 6px; background: var(--rule); margin-top: 8px; position: relative; overflow: hidden; }
.cov .bar2 i { position: absolute; left: 0; top: 0; bottom: 0; background: repeating-linear-gradient(135deg, var(--hatch) 0 2px, transparent 2px 6px); }
.cov .bar2 b { position: absolute; left: 0; top: 0; bottom: 0; background: var(--sakura); }
.filters { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; margin-bottom: 16px; }
.seg { display: inline-flex; border: 1px solid var(--rule-2); }
.seg button { background: transparent; border: 0; border-left: 1px solid var(--rule-2); color: var(--ash); padding: 5px 10px; font: 500 10.5px var(--font-cyber); letter-spacing: 0.12em; text-transform: uppercase; cursor: pointer; }
.seg button:first-child { border-left: 0; }
.seg button[aria-pressed="true"] { background: var(--crimson-soft); color: var(--paper); }
.seg button:hover { color: var(--paper); }
select.sel { font: 500 11px var(--font-cyber); color: var(--paper); background: var(--ink); border: 1px solid var(--rule-2); padding: 5px 8px; }
.plist { list-style: none; margin: 0 0 26px; padding: 0; display: flex; flex-direction: column; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.prow { background: var(--ink); display: grid; grid-template-columns: minmax(0, 1fr) 80px 150px 120px; align-items: center; gap: 14px; padding: 10px 16px; text-decoration: none; color: var(--paper); }
.prow:hover { background: var(--ink-2); }
.which-card { margin-bottom: 18px; }
.which-pick .h2 { margin-bottom: 4px; }
.which-filter { width: 100%; max-width: 360px; margin: 8px 0 12px; padding: 8px 10px; background: var(--code); color: var(--paper); border: 1px solid var(--rule-2); font: inherit; }
.which-choices { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.which-choices .btn.right { border-color: var(--sakura); color: var(--sakura); opacity: 1; }
.which-choices .btn.wrong { opacity: 1; }
.which-choices .btn.wrong { border-color: var(--crimson-bright); color: var(--crimson-bright); }
.prow .t { font-size: 14px; }
.prow .t small { display: block; font-size: 11px; color: var(--ash-2); }
.diff { font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; }
.diff.easy { color: var(--paper); }
.diff.medium { color: var(--sakura); }
.diff.hard { color: var(--crimson-bright); }
.tags { display: flex; gap: 4px; }
.tag2 { font-size: 9.5px; letter-spacing: 0.08em; color: var(--ash); border: 1px solid var(--rule-2); padding: 0 5px; white-space: nowrap; }
.pstat { font-size: 11px; color: var(--ash-2); text-align: right; }
.pstat.solved { color: var(--sakura); }
.pstat.due { color: var(--crimson-bright); }
@media (max-width: 640px) { .prow { grid-template-columns: minmax(0, 1fr) auto; } .prow .tags { display: none; } .coverage { grid-template-columns: 1fr; } }

/* ---------- solve page ---------- */
.solve-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.pv-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.clock { display: flex; align-items: center; gap: 10px; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash); }
.clock b { font: 500 18px var(--font-cyber); letter-spacing: 0.02em; color: var(--paper); font-variant-numeric: tabular-nums; }
.clock.over b { color: var(--crimson-bright); }
.mode-badge { border: 1px solid var(--rule-2); padding: 3px 8px; }
.mode-badge.strict { border-color: var(--crimson); color: var(--crimson-bright); }
.solve-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 16px; align-items: start; }
@media (max-width: 960px) { .solve-grid { grid-template-columns: 1fr; } }
.statement h1 { font-family: var(--font-zen); font-size: 26px; margin: 0 0 4px; }
.statement .meta { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash); margin-bottom: 14px; display: flex; gap: 12px; flex-wrap: wrap; }
.example { margin: 10px 0; }
.example .h { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ash); margin-bottom: 4px; }
.example pre { margin: 0; overflow-x: auto; }
.editor-wrap { border: 1px solid var(--rule-2); background: var(--code); }
.editor-wrap .CodeMirror { height: 420px; background: var(--code); color: var(--paper); font-family: var(--font-cyber); font-size: var(--ed-font, 14px); line-height: 1.6; }
.CodeMirror-gutters { background: var(--code); border-right: 1px solid var(--rule); }
.CodeMirror-linenumber { color: var(--ash-2); }
.CodeMirror-cursor { border-left: 2px solid var(--crimson-bright); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: var(--select) !important; }
.CodeMirror-matchingbracket { color: var(--sakura) !important; text-decoration: underline; }
.CodeMirror-activeline-background { background: var(--activeline); }
.editor-wrap .cm-s-default .cm-keyword { color: var(--tok-k); } .editor-wrap .cm-s-default .cm-string { color: var(--tok-s); }
.editor-wrap .cm-s-default .cm-number { color: var(--tok-n); } .editor-wrap .cm-s-default .cm-comment { color: var(--tok-c); font-style: italic; }
.editor-wrap .cm-s-default .cm-def { color: var(--tok-f); } .editor-wrap .cm-s-default .cm-builtin { color: var(--tok-b); }
.editor-wrap .cm-s-default .cm-variable, .editor-wrap .cm-s-default .cm-property { color: var(--paper); }
.editor-wrap .cm-s-default .cm-operator { color: var(--ash); } .editor-wrap .cm-s-default .cm-variable-2 { color: var(--tok-f); }
.editor-wrap .cm-s-default .cm-meta { color: var(--tok-b); } .editor-wrap .cm-s-default .cm-error { color: var(--crimson-bright); background: none; }
.editor-wrap .cm-s-default .cm-bracket { color: var(--ash); }
.cm-fat-cursor .CodeMirror-cursor { background: var(--hl-line); border: 0; }
.solve-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin: 10px 0; }
.solve-actions .spacer { flex: 1; }
.results { margin-top: 12px; }
.res-case { border: 1px solid var(--rule); border-left: 2px solid var(--rule-2); background: var(--ink); padding: 8px 12px; margin-bottom: 6px; font-size: 12.5px; }
.res-case.ok { border-left-color: var(--sakura); }
.res-case.bad { border-left-color: var(--crimson); }
.res-case .k { color: var(--ash); display: inline-block; min-width: 72px; }
.res-case pre { margin: 4px 0 0; padding: 6px 10px; font-size: 12px; overflow-x: auto; }
.verdict-box { border: 1px solid var(--rule); border-left: 2px solid var(--rule-2); background: var(--ink); padding: 14px 16px; position: relative; overflow: hidden; }
.verdict-box.ok { border-left-color: var(--sakura); }
.verdict-box.warn { border-left-color: var(--warn-line); }
.verdict-box.bad { border-left-color: var(--crimson); }
.verdict-box .v { font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase; margin-bottom: 8px; }
.verdict-box.ok .v { color: var(--sakura); text-shadow: 0 0 12px var(--glow-sakura); }
.verdict-box.bad .v { color: var(--crimson-bright); }
.verdict-box.warn .v { color: var(--warn); }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin: 10px 0; }
.fact { background: var(--ink-2); padding: 8px 10px; }
.fact span { display: block; font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); }
.fact b { font-weight: 500; font-size: 14px; }
.factors { font-size: 11.5px; color: var(--ash); }
.factors b { color: var(--paper); font-weight: 500; }
.hintlog .hintbox { margin-bottom: 8px; }

/* ---------- settings ---------- */
.set-section { margin-bottom: 28px; }
.set-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 11px 16px; background: var(--ink); }
.set-rows { display: flex; flex-direction: column; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.set-row .n { font-size: 13.5px; }
.set-row .d { font-size: 11.5px; color: var(--ash); max-width: 60ch; }
.presets { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin-bottom: 8px; }
.preset { background: var(--ink); border: 0; text-align: left; padding: 14px 16px; cursor: pointer; color: var(--paper); border-left: 2px solid transparent; }
.preset:hover { background: var(--ink-2); }
.preset[aria-pressed="true"] { border-left-color: var(--crimson-bright); background: var(--crimson-soft); }
.preset .pn { font-family: var(--font-zen); font-size: 18px; font-weight: 700; }
.preset .pd { font-size: 11.5px; color: var(--ash); margin-top: 2px; }
.toggle { width: 42px; height: 22px; border: 1px solid var(--rule-2); background: var(--ink-2); position: relative; cursor: pointer; padding: 0; }
.toggle::after { content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; background: var(--ash-2); transition: left 0.15s, background 0.15s; }
.toggle[aria-checked="true"] { border-color: var(--crimson); }
.toggle[aria-checked="true"]::after { left: 23px; background: var(--crimson-bright); }
.range { display: flex; align-items: center; gap: 10px; font-size: 12px; }
.range input { accent-color: var(--crimson); width: 150px; }
.saved { font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--sakura); opacity: 0; transition: opacity 0.3s; }
.saved.on { opacity: 1; }
.danger { border-color: var(--crimson) !important; color: var(--crimson-bright) !important; }
.inline-in { font: 400 12px var(--font-cyber); color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule-2); padding: 5px 8px; width: 110px; }
@media (max-width: 640px) {
  .presets { grid-template-columns: 1fr; }
  .set-row { grid-template-columns: 1fr; }
  .set-row > * { min-width: 0; }
  .set-row .seg { justify-self: start; max-width: 100%; flex-wrap: wrap; }  /* as wide as its options, not the row */
  .range { flex-wrap: wrap; }
  .range .sel { flex: 1 1 100%; min-width: 0; max-width: 100%; }  /* long topic names: the select takes its own line */
  .range .inline-in { flex: 1 1 auto; }
}

/* the tutor switched off in settings */
body.no-tutor #hintBtn, body.no-tutor #explainBtn, body.no-tutor #askBtn, body.no-tutor #explainStep,
body.no-tutor .ask, body.no-tutor #reviewBtn { display: none !important; }
.math { font-family: var(--font-cyber); color: var(--sakura); white-space: nowrap; }

/* garden: expanded (full screen) */
#stage-slot.expanded { position: fixed; inset: 0; z-index: 40; background: var(--void); }
#stage-slot.expanded .stage { height: 100vh; height: 100dvh; min-height: 0; border: 0; }
body.garden-full { overflow: hidden; }
.hud-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.hud-btn { pointer-events: auto; background: var(--hud-bg); border-color: var(--rule); }

/* ---------- journal ---------- */
.stats.six { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.stats.six em { display: block; font-style: normal; font-size: 10.5px; color: var(--ash-2); margin-top: 2px; }
@media (max-width: 900px) { .stats.six { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 520px) { .stats.six { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.heat { width: 100%; height: auto; display: block; }
.heat rect:hover { stroke: var(--paper); stroke-width: 1; }
.axis { fill: var(--ash); font: 9.5px var(--font-cyber); }
.legend-row { display: flex; align-items: center; gap: 4px; font-size: 10.5px; color: var(--ash); margin-top: 8px; flex-wrap: wrap; }
.legend-row i { width: 12px; height: 12px; border-radius: 2px; display: inline-block; }
.legend-row span { margin: 0 4px; }
.tview { margin-top: 10px; }
.tview summary { cursor: pointer; font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash); }
.jt { border-collapse: collapse; font-size: 12px; margin-top: 8px; width: 100%; max-width: 640px; }
.jt th, .jt td { text-align: left; padding: 3px 10px 3px 0; border-bottom: 1px solid var(--rule); }
.jt th { color: var(--ash); font-weight: 500; }
.sms { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 800px) { .sms { grid-template-columns: 1fr; } }
.sm { background: var(--ink); border: 1px solid var(--rule); padding: 10px 12px; }
.sm-t { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; display: flex; justify-content: space-between; margin-bottom: 4px; }
.sm-empty { color: var(--ash-2); font-size: 12px; padding: 50px 0; text-align: center; }
.smv { width: 100%; height: auto; display: block; }
.smv .grid { stroke: var(--rule); stroke-width: 1; }
.smv .target { stroke: var(--ash); stroke-width: 1; stroke-dasharray: 4 4; }
.smv .trend { fill: none; stroke: var(--trend); stroke-width: 2; }
.smv .dot { fill: var(--sakura); stroke: var(--ink); stroke-width: 2; }
.smv .dot.re { fill: var(--ink); stroke: var(--sakura); stroke-width: 2; }
.smv .hit { fill: transparent; cursor: default; }
.covlist { display: flex; flex-direction: column; gap: 6px; }
.covrow { display: grid; grid-template-columns: 190px minmax(0, 1fr) 90px; gap: 12px; align-items: center; font-size: 12px; }
.covrow .cn { color: var(--paper); }
.covrow .cv { color: var(--ash); text-align: right; font-variant-numeric: tabular-nums; }
.cbar { height: 8px; background: var(--rule); position: relative; border-radius: 2px; overflow: hidden; }
.cbar i { position: absolute; left: 0; top: 0; bottom: 0; background: repeating-linear-gradient(135deg, var(--hatch) 0 2px, transparent 2px 6px); }
.cbar b { position: absolute; left: 0; top: 0; bottom: 0; background: var(--sakura); border-right: 2px solid var(--ink); }
@media (max-width: 600px) { .covrow { grid-template-columns: 1fr 60px; } .covrow .cbar { grid-column: 1 / -1; grid-row: 2; } }
.jtip { position: fixed; z-index: 60; pointer-events: none; background: var(--glass-2); border: 1px solid var(--rule-2); padding: 6px 9px; font-size: 11.5px; color: var(--paper); max-width: 280px; }
.jtip b { font-weight: 500; }
/* preview */
.journey input { width: 100%; accent-color: var(--crimson); }
.stops { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 4px; margin-top: 6px; }
.range .out { min-width: 44px; text-align: right; font-variant-numeric: tabular-nums; }

.scroll-cue { display: none; }
@media (hover: none) and (pointer: coarse) { .scroll-cue { display: inline-flex; } }
@media (max-height: 520px) { .stage { height: 72vh; min-height: 0; } }
.cov-key { font-size: 10.5px; color: var(--ash-2); margin: -14px 0 18px; }
.cov-key i { display: inline-block; width: 18px; height: 8px; vertical-align: middle; margin: 0 4px 0 10px; }
.cov-key i.s { background: var(--sakura); }
.cov-key i.a { background: repeating-linear-gradient(135deg, var(--hatch-strong) 0 2px, transparent 2px 6px); border: 1px solid var(--rule); }

/* compact header on short or narrow screens: one row, the nav scrolls sideways */
@media (max-height: 520px), (max-width: 700px) {
  .top-inner { flex-wrap: nowrap; gap: 12px; padding: 6px 12px; }
  .brand { font-size: 15px; flex: none; }
  .brand small { display: none; }
  .nav { flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { flex: none; padding: 4px 8px; font-size: 10px; letter-spacing: 0.12em; }
  .nav .long { display: none; }
  .me { padding: 2px; border-color: transparent; }
  .me-name { display: none; }
}

/* ---------- profile (#/profile) ---------- */
.pf-head { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 18px; align-items: center; margin-bottom: 28px; padding: 20px; }
.pf-av { display: grid; place-items: center; width: 64px; height: 64px; background: var(--ink-2); color: var(--crimson-bright);
  font: 700 22px var(--font-zen); border: 1px solid var(--crimson); box-shadow: 0 0 18px var(--glow-crimson); }
.pf-name { font-family: var(--font-zen); font-weight: 700; font-size: clamp(22px, 4vw, 28px); margin: 0 0 4px; overflow-wrap: anywhere; }
.pf-who .muted { margin: 0; }
.pf-bio { margin: 8px 0 0; color: var(--paper); font-size: 13px; overflow-wrap: anywhere; }
.pf-stats { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1px; margin: 0;
  background: var(--rule); border: 1px solid var(--rule); }
.pf-stats > div { background: var(--ink); padding: 10px 14px; }
.pf-stats dt { font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); }
.pf-stats dd { margin: 4px 0 0; font: 700 20px var(--font-cyber); color: var(--paper); }
.pf-stats dd small { font-size: 12px; color: var(--ash); font-weight: 400; }
.pf-stats .pf-days { font-size: 15px; }
input.pf-in, textarea.pf-in { font: 400 12px var(--font-cyber); color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule-2); padding: 6px 8px; width: 240px; max-width: 100%; }
textarea.pf-bio-in { resize: vertical; font-family: inherit; }
select.pf-in { width: 240px; max-width: 100%; }
.pf-in:focus { outline: none; border-color: var(--crimson); }
.pf-actions { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
@media (max-width: 700px) {
  .pf-head { grid-template-columns: 1fr; justify-items: start; }
  .pf-stats { justify-self: stretch; }
  input.pf-in, textarea.pf-in, select.pf-in { width: 100%; }
}

/* ---------- guided mode (docs/GUIDED_MODE.md) ---------- */
.guide { margin: 4px 0 12px; padding: 12px 14px; background: var(--ink-2); border: 1px solid var(--rule); border-left: 2px solid var(--sakura); }
.guide .ghead { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; margin-bottom: 8px; }
.guide .ghead .kicker { margin: 0; color: var(--sakura); }
.guide .ghead .quiet { font-size: 12px; }
.gtrack { display: flex; align-items: center; gap: 6px; margin: 4px 0 6px; }
.gdot { width: 18px; height: 4px; background: var(--rule-2); }
.gdot.done { background: var(--sakura); }
.gdot.cur { background: var(--crimson-bright); }
.glabel { margin-left: 8px; font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash); }
.gdone { margin: 0 0 8px; padding-left: 20px; font-size: 12.5px; color: var(--ash); }
.gdone li::marker { color: var(--sakura); }
.glog { max-height: 260px; overflow-y: auto; margin-bottom: 8px; }
.gmsg { padding: 8px 0; border-top: 1px solid var(--rule); }
.gmsg:first-child { border-top: 0; }
.gmsg .who { font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--sakura); }
.gmsg.offline .who { color: var(--ash); }
.gmsg .body { margin-top: 3px; line-height: 1.55; }
.gmsg .gq { color: var(--ash); font-style: italic; margin-bottom: 4px; }
.gmsg .gq::before { content: "you: "; font-style: normal; }
.linkish { background: none; border: 0; padding: 0; margin-top: 4px; color: var(--ash); font: inherit; font-size: 11.5px; text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }
.linkish:hover { color: var(--paper); }
.linkish:disabled { text-decoration: none; cursor: default; }
.editor-wrap .guide-line { background: var(--sakura-line); box-shadow: inset 2px 0 0 var(--sakura); }
.guide-note { display: flex; gap: 10px; align-items: baseline; margin: 2px 0 6px 4px; padding: 6px 10px; background: var(--ink-2); border-left: 2px solid var(--sakura); font: 13px/1.5 var(--font-cyber); color: var(--paper); white-space: normal; }
.guide-note .who { flex: none; font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--sakura); }
.guide-note .t { flex: 1; }
.guide-note button { flex: none; background: none; border: 0; color: var(--ash); font-size: 16px; line-height: 1; cursor: pointer; }
.guide-note button:hover { color: var(--paper); }

/* ---------- day garden: a painting on the page (docs/DAY_GARDEN.md) ---------- */
/* no hard frame: the bottom of the painting soaks into the paper */
.stage.day { border-bottom-color: transparent; }
.stage.day::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 90px; pointer-events: none;
  background: linear-gradient(to bottom, transparent, var(--void)); z-index: 1; }
.stage.day .hud { z-index: 2; }
/* the HUD loses its boxes: ink text on the paper, underlined like a caption */
.stage.day .hud-tag { background: transparent; border-color: transparent; border-bottom-color: var(--rule-2); backdrop-filter: none; }
.stage.day .hud-btn { background: var(--hud-bg); }
body.garden-full .stage.day::after { display: none; }

/* ---------- mistake journal ---------- */
.habits { list-style: none; margin: 0; padding: 0; border: 1px solid var(--rule); background: var(--ink); }
.habit { display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; padding: 14px 16px; border-top: 1px solid var(--rule); }
.habit:first-child { border-top: 0; }
.hb-main { flex: 1 1 340px; min-width: 0; }
.hb-name { font-family: var(--font-zen); font-size: 17px; font-weight: 700; }
.hb-meta { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ash); margin-top: 3px; }
.hb-ex { margin-top: 6px; font-size: 12.5px; color: var(--ash); overflow-wrap: anywhere; }
.hb-ex code { display: block; margin-top: 3px; white-space: pre-wrap; }
.hb-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.hb-fixed { margin-top: 10px; font-size: 13px; }
.hb-fixed summary { cursor: pointer; color: var(--ash); letter-spacing: 0.12em; text-transform: uppercase; font-size: 11px; }
.hb-fixed li::marker { color: var(--sakura); }

/* ---------- pattern map ---------- */
.mp-wrap { margin: 10px 0 18px; overflow-x: auto; }
.mp-svg { width: 100%; height: auto; display: block; margin: 0 auto; }
.mp-edge { fill: none; stroke: var(--rule-2); stroke-width: 1.4; transition: stroke 0.2s; }
.mp-edge.on { stroke: var(--crimson-bright); stroke-width: 1.8; }
.mp-node { cursor: pointer; outline: none; }
.mp-box { fill: var(--ink); stroke: var(--rule-2); stroke-width: 1; transition: stroke 0.2s, fill 0.2s; }
.mp-node:hover .mp-box, .mp-node:focus-visible .mp-box { stroke: var(--paper); }
.mp-node.sel .mp-box { stroke: var(--crimson-bright); stroke-width: 1.6; fill: var(--ink-2); }
.mp-node.frontier .mp-box { stroke: var(--sakura); stroke-dasharray: 5 3; }
.mp-name { fill: var(--paper); font: 700 14px var(--font-zen); }
.mp-sub { fill: var(--ash); font: 500 10.5px var(--font-cyber); letter-spacing: 0.08em; }
.mp-next { fill: var(--sakura); font: 500 9.5px var(--font-cyber); letter-spacing: 0.18em; text-transform: uppercase; }
.mp-seg { fill: var(--rule); }
.mp-seg.l1 { fill: var(--ash); } .mp-seg.l2 { fill: var(--crimson-dim); } .mp-seg.l3 { fill: var(--crimson-bright); } .mp-seg.l4 { fill: var(--sakura); }
.mp-list { display: none; margin: 0; padding-left: 0; list-style: none; }
.mp-list > li { margin-bottom: 10px; }
.mp-list ul { margin: 4px 0 0; padding-left: 18px; }
.mp-layer { font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); }
@media (max-width: 700px) { .mp-svg { display: none; } .mp-list { display: block; } }
.mp-hint { margin-top: 4px; }
.mp-detail { padding: 18px 20px; margin-bottom: 24px; }
.mp-dhead { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; align-items: flex-start; margin-bottom: 8px; }
.mp-dhead .title { margin: 0 0 4px; }
.mp-actions { display: flex; gap: 8px; }
.mp-group { margin-top: 14px; }
.mp-gname { font: 700 16px var(--font-zen); margin: 0 0 6px; }
.mp-gname .quiet { font: 400 12px var(--font-cyber); }
.mp-probs { list-style: none; margin: 0; padding: 0; }
.mp-prob { display: flex; gap: 10px; align-items: baseline; padding: 5px 0; border-top: 1px solid var(--rule); }
.mp-prob a { color: var(--paper); text-decoration: none; flex: 1; }
.mp-prob a:hover { color: var(--crimson-bright); }
.mp-prob.done a { color: var(--ash); }
.mp-ok { color: var(--sakura); }
.mp-pats { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; margin-bottom: 30px; }
.mp-pat { padding: 14px 16px; }
.mp-phead { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.mp-count { font: 500 12px var(--font-cyber); color: var(--ash); white-space: nowrap; }
.mp-bar { height: 4px; background: var(--rule); margin: 6px 0 8px; }
.mp-bar i { display: block; height: 100%; background: var(--sakura); }
.mp-topics { margin: 0 0 6px; font-size: 12.5px; }
.mp-recipe { margin: 4px 0 8px; font-size: 13px; }
.mp-recipe summary { cursor: pointer; color: var(--ash); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; }
.mp-recipe ol { margin: 6px 0 0; padding-left: 20px; color: var(--paper); }
.mp-nextline { margin: 8px 0 0; font-size: 12.5px; }

/* ---------- contemplation: the garden drifting by ---------- */
.stage.contemplating .hud, .stage.contemplating .tip { opacity: 0; transition: opacity 1.2s; pointer-events: none; }
.stage .hud { transition: opacity 0.6s; }
.breath { position: fixed; inset: 0; z-index: 90; background: var(--void); animation: breath-in 1.2s ease both; }
.breath .stage { height: 100vh; min-height: 0; border: 0; }
.breath .stage.day::after { display: none; }
.breath-note { position: absolute; left: 0; right: 0; bottom: 24px; margin: 0; text-align: center; font-size: 11px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--ash); pointer-events: none; animation: breath-note 6s ease both; z-index: 3; }
@keyframes breath-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes breath-note { 0% { opacity: 0; } 15% { opacity: 1; } 70% { opacity: 1; } 100% { opacity: 0; } }
body.breathing { overflow: hidden; }
.breath-link { margin-left: 6px; font-size: inherit; letter-spacing: inherit; text-transform: inherit; text-decoration: none; }
@media (prefers-reduced-motion: reduce) { .breath { animation: none; } }

/* ---------- OA simulation ---------- */
.oa-active { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 16px; margin: 12px 0; border-left: 2px solid var(--crimson); }
.oa-formats { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 10px; }
.oa-format { text-align: left; padding: 14px; cursor: pointer; color: var(--paper); font: inherit; display: flex; flex-direction: column; gap: 4px; border: 1px solid var(--rule); }
.oa-format:hover { border-color: var(--rule-2); }
.oa-format.on { border-color: var(--crimson-bright); box-shadow: inset 2px 0 0 var(--crimson-bright); }
.oa-fname { font: 700 17px var(--font-zen); }
.oa-fmeta { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--crimson-bright); }
.oa-fnote { font-size: 12.5px; color: var(--ash); }
.oa-custom { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 12px; }
.oa-custom input { width: 64px; margin-left: 6px; font: inherit; color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule-2); padding: 4px 6px; }
.oa-start { margin: 18px 0 28px; }
.oa-hist { width: 100%; border-collapse: collapse; font-size: 13px; }
.oa-hist th { text-align: left; font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash); font-weight: 500; padding: 6px 8px; border-bottom: 1px solid var(--rule-2); }
.oa-hist td { padding: 8px; border-bottom: 1px solid var(--rule); }
.oa-bar { display: flex; justify-content: space-between; align-items: flex-end; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.oa-bar .kicker { margin-bottom: 6px; }
.oa-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.oa-tab { font: inherit; font-size: 13px; color: var(--ash); background: transparent; border: 1px solid var(--rule); padding: 7px 12px; cursor: pointer; }
.oa-tab b { color: var(--paper); margin-right: 4px; }
.oa-tab.on { color: var(--paper); border-color: var(--crimson-bright); }
.oa-tab.done .oa-tstat { color: var(--sakura); }
.oa-tstat { margin-left: 6px; font-size: 11px; letter-spacing: 0.08em; }
.oa-right { display: flex; align-items: center; gap: 12px; }
.oa-clock { font: 500 26px var(--font-cyber); font-variant-numeric: tabular-nums; color: var(--paper); min-width: 5ch; text-align: right; }
.oa-clock.low { color: var(--crimson-bright); }
.oa-clock.last { animation: oa-pulse 1s ease-in-out infinite; }
@keyframes oa-pulse { 50% { opacity: 0.45; } }
@media (prefers-reduced-motion: reduce) { .oa-clock.last { animation: none; } }
.oa-score { margin-top: 10px; font-size: 13px; color: var(--ash); }
.oa-score b { color: var(--paper); }
.oa-score.ok b { color: var(--sakura); }
.oa-verdict { padding: 10px 12px; border-left: 2px solid var(--crimson-bright); background: var(--ink-2); }
.oa-verdict.ok { border-left-color: var(--sakura); color: var(--sakura); }
.oa-sub { font: 400 15px var(--font-cyber); color: var(--ash); }
.oa-res { padding: 14px 16px; margin-bottom: 12px; border-left: 2px solid var(--crimson-dim); }
.oa-res.ok { border-left-color: var(--sakura); }
.oa-rhead { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.oa-rtitle { font: 700 18px var(--font-zen); margin: 0; }
.oa-rtitle .diff { font: 500 10.5px var(--font-cyber); margin-left: 8px; }
.oa-rscore { font: 500 20px var(--font-cyber); }
.oa-res.ok .oa-rscore { color: var(--sakura); }
.oa-rmeta { margin: 4px 0 10px; color: var(--ash); font-size: 12.5px; }
.oa-ractions { display: flex; gap: 8px; flex-wrap: wrap; }
.oa-sol pre { margin-top: 10px; }

/* ---------- welcome / onboarding (front-end demo) ---------- */
.welcome { position: fixed; inset: 0; z-index: 90; background: var(--void); animation: breath-in 1s ease both; }
.wl-slot, .wl-slot .stage { position: absolute; inset: 0; height: 100%; min-height: 0; border: 0; }
.wl-slot .stage.day::after { display: none; }
.wl-slot .hud { display: none; }
.wl-card { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: min(460px, calc(100% - 32px)); max-height: calc(100% - 48px);
  overflow-y: auto; padding: 28px 28px 22px; background: var(--hud-card); backdrop-filter: blur(6px); border: 1px solid var(--rule-2); z-index: 3; }
.wl-mark { font: 700 34px var(--font-zen); letter-spacing: 0.04em; text-align: center; }
.wl-mark small { font: 500 12px var(--font-cyber); color: var(--crimson-bright); letter-spacing: 0.2em; margin-left: 8px; vertical-align: middle; }
.wl-line { text-align: center; color: var(--ash); margin: 8px 0 22px; }
.wl-wait { animation: oa-pulse 1.4s ease-in-out infinite; }
.wl-btns { display: flex; flex-direction: column; gap: 10px; align-items: stretch; }
.wl-provider { justify-content: center; padding: 12px; }
.wl-guest { align-self: center; margin-top: 4px; }
.wl-fine { font-size: 11.5px; color: var(--ash); text-align: center; margin: 18px 0 0; line-height: 1.6; }
.wl-demo { color: var(--ash-2); }
.wl-stones { display: flex; gap: 10px; justify-content: center; margin-bottom: 18px; }
.wl-stones i { width: 22px; height: 12px; border-radius: 50%; border: 1px solid var(--rule-2); background: var(--ink-2); }
.wl-stones i.on { background: var(--sakura); border-color: var(--sakura); }
.wl-stones i.cur { border-color: var(--crimson-bright); box-shadow: 0 0 0 3px var(--crimson-soft); }
.wl-q { font: 700 24px var(--font-zen); margin: 2px 0 16px; }
.wl-opts { display: flex; flex-direction: column; gap: 8px; }
.wl-opt { text-align: left; font: inherit; color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule); padding: 12px 14px; cursor: pointer; display: flex; flex-direction: column; gap: 2px; }
.wl-opt:hover, .wl-opt:focus-visible { border-color: var(--crimson-bright); }
.wl-opt b { font-weight: 500; }
.wl-opt span { font-size: 12px; color: var(--ash); }
.wl-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 18px; }
.wl-chip { font: inherit; font-size: 13px; color: var(--ash); background: transparent; border: 1px solid var(--rule-2); padding: 6px 11px; cursor: pointer; }
.wl-chip[aria-pressed="true"] { color: var(--paper); border-color: var(--sakura); background: var(--sakura-soft); }
.wl-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.wl-back { display: block; margin-top: 14px; }
.wl-sum { list-style: none; padding: 0; margin: 0; }
.wl-sum li { padding: 9px 0; border-top: 1px solid var(--rule); }
.wl-sum span { display: block; font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); margin-bottom: 2px; }
.wl-tour { position: absolute; left: 50%; bottom: 56px; transform: translateX(-50%); width: min(440px, calc(100% - 32px)); z-index: 70;
  padding: 16px 18px; background: var(--hud-card); backdrop-filter: blur(6px); border: 1px solid var(--rule-2); border-left: 2px solid var(--sakura); }
.wl-tour p { margin: 4px 0 0; }
.wl-tt { font: 700 19px var(--font-zen); margin: 0; }

/* ---------- Today ---------- */
.today-strip { margin: 22px 0 6px; }
.td-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.td-done { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--sakura); }
.td-items { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 8px; }
.td-item a { display: flex; flex-direction: column; gap: 3px; padding: 12px 14px; height: 100%; text-decoration: none; color: var(--paper);
  background: var(--ink); border: 1px solid var(--rule); border-left: 2px solid var(--crimson); }
.td-item a:hover { border-color: var(--rule-2); border-left-color: var(--crimson-bright); }
.td-item.done a { border-left-color: var(--sakura); color: var(--ash); }
.td-kind { font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--crimson-bright); }
.td-item.done .td-kind { color: var(--sakura); }
.td-title { font-weight: 500; }
.td-mins { font-size: 12px; color: var(--ash); }
.td-stroke { height: 3px; background: var(--rule); margin-top: 10px; }
.td-stroke i { display: block; height: 100%; background: var(--sakura); transition: width 0.6s; }
.td-more { margin-top: 8px; }
body.garden-full .wl-tour, .stage .wl-tour { pointer-events: auto; }
@media (max-width: 700px) { .wl-tour { bottom: 12px; } }
/* short landscape phones: a compact card at the side, the garden framing its stop beside it (welcome.js place()) */
@media (max-height: 500px) and (orientation: landscape) {
  .wl-tour { left: 12px; top: 50%; bottom: auto; transform: translateY(-50%); width: min(290px, 38vw); padding: 10px 12px;
    max-height: calc(100% - 24px); overflow-y: auto; }
  .wl-tour .kicker { font-size: 9.5px; margin-bottom: 4px; }
  .wl-tour .wl-tt { font-size: 15px; }
  .wl-tour p { font-size: 12px; line-height: 1.5; }
  .wl-tour .wl-row { margin-top: 8px; }
  .wl-tour .btn { padding: 6px 10px; }
}
.range-pair { display: flex; flex-direction: column; gap: 6px; }
.range .rl { min-width: 118px; color: var(--ash); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; }

/* ---------- quick toggles: sound and day/night (garden HUD, sign-in screen) ---------- */
.hud-quick, .wl-quick { display: inline-flex; gap: 6px; pointer-events: auto; }
.wl-quick { position: absolute; top: 18px; right: 18px; z-index: 4; }
.quick { width: 34px; height: 34px; display: grid; place-items: center; padding: 0; cursor: pointer; color: var(--paper);
  background: var(--hud-bg); border: 1px solid var(--rule-2); backdrop-filter: blur(2px); transition: border-color 0.2s, color 0.2s; }
.quick:hover, .quick:focus-visible { border-color: var(--paper); }
.quick[aria-pressed="true"] { color: var(--sakura); border-color: var(--sakura); }
.quick svg { width: 17px; height: 17px; fill: currentColor; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.quick svg path[fill="none"], .quick svg circle + path { fill: none; }
.quick.waiting { animation: quick-wait 2s ease-in-out infinite; }
@keyframes quick-wait { 50% { box-shadow: 0 0 0 4px var(--sakura-soft); } }
@media (prefers-reduced-motion: reduce) { .quick.waiting { animation: none; outline: 1px dashed var(--sakura); outline-offset: 2px; } }

/* ---------- Home (the page you land on every day) ---------- */
.home-head { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 32px; align-items: start; margin: 4px 0 8px; }
.status-line { margin: 0 0 10px; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); }
.haiku { margin: 0; font: 500 15px/1.75 var(--font-zen); color: var(--ash); text-align: right; letter-spacing: 0.02em; white-space: nowrap; }
.resume { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; max-width: 560px; }
.resume a { display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 12px; align-items: baseline; padding: 9px 14px; text-decoration: none;
  color: var(--paper); background: var(--ink); border: 1px solid var(--rule); border-left: 2px solid var(--sakura); }
.resume a:hover { border-color: var(--rule-2); border-left-color: var(--sakura); }
.rs-title { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rs-sub { font-size: 12px; color: var(--ash); }
.rs-act { font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--sakura); }
.td-any { font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); text-decoration: none; }
.td-any:hover { color: var(--paper); }
.btn.td-start { display: flex; align-items: baseline; gap: 14px; width: 100%; padding: 15px 18px; margin-bottom: 8px; text-transform: none; letter-spacing: 0.02em; }
.btn.td-start .td-kind { color: var(--on-accent); opacity: 0.85; }
.btn.td-start .td-title { font: 700 16px var(--font-zen); flex: 1; }
.btn.td-start .td-mins { color: var(--on-accent); opacity: 0.8; }
.continue { margin: 28px 0 22px; }
.topic-tag { margin-left: 10px; font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--sakura); vertical-align: 1px; }
.all-topics { margin: 6px 0 30px; }
.all-topics > summary { list-style: none; cursor: pointer; }
.all-topics > summary::-webkit-details-marker { display: none; }
.all-topics > summary .h2 { align-items: baseline; }
.all-topics > summary .h2::before { content: "▸"; margin-right: 8px; display: inline-block; transition: transform 0.2s; }
.all-topics[open] > summary .h2::before { transform: rotate(90deg); }
.all-topics > summary .h2 small { margin-left: auto; }
.all-topics > summary:hover .h2 { color: var(--paper); }
.all-topics .tier { margin: 18px 0 0; }
.all-topics .tier .h2 { border-bottom: 0; padding-bottom: 0; margin-bottom: 8px; color: var(--ash); }
@media (max-width: 700px) {
  .home-head { grid-template-columns: 1fr; }
  .haiku { text-align: left; white-space: normal; }
  .resume a { grid-template-columns: minmax(0, 1fr) auto; }
  .resume .td-kind, .resume .rs-sub { grid-column: 1; }
}

/* finish screens: a practice recap, and where today's plan stands */
.recap .recap-moves { list-style: none; padding: 0; margin: 8px 0 14px; }
.recap .recap-moves li { padding: 6px 0; border-top: 1px solid var(--rule); }
.recap .recap-moves b { color: var(--paper); font-weight: 500; margin-right: 6px; }
.recap .actions { display: flex; gap: 8px; justify-content: flex-end; flex-wrap: wrap; margin-top: 14px; }
.today-next { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline; margin: 14px 0 0; padding: 10px 14px;
  border: 1px solid var(--rule); border-left: 2px solid var(--sakura); font-size: 13px; }
.today-next .td-kind { color: var(--sakura); }

/* the Problems page's view tabs (list, roadmap, patterns) */
.seg a { color: var(--ash); padding: 5px 12px; font: 500 10.5px var(--font-cyber); letter-spacing: 0.12em; text-transform: uppercase; text-decoration: none; border-left: 1px solid var(--rule-2); }
.seg a:first-child { border-left: 0; }
.seg a:hover { color: var(--paper); }
.seg a[aria-current="page"] { background: var(--crimson-soft); color: var(--paper); }

/* ---------- page transitions (View Transitions API; browsers without it just swap) ----------
   The header stays put. Night: the new page wipes in from the top like a scan. Day: it soaks in like ink. */
.top { view-transition-name: topbar; }
::view-transition-group(topbar) { animation: none; }
html { background: var(--void); }  /* what shows behind the page snapshots while they animate */
::view-transition { background: var(--void); }
::view-transition-old(root), ::view-transition-new(root) { background: var(--void); }  /* opaque, so the pages never show through each other */
::view-transition-old(root) { animation: none; }  /* night: the old page stays put and the new one wipes over it */
::view-transition-new(root) { animation: vt-scan 0.28s cubic-bezier(.3,.7,.2,1) both; }
:root[data-theme="light"]::view-transition-old(root) { animation: vt-out 0.2s ease-in both; }
:root[data-theme="light"]::view-transition-new(root) { animation: vt-ink 0.34s ease-out both; }
@keyframes vt-out { to { opacity: 0; } }
@keyframes vt-scan { from { clip-path: inset(0 0 100% 0); } to { clip-path: inset(0 0 0 0); } }
@keyframes vt-ink { from { opacity: 0; filter: blur(5px); } 60% { opacity: 1; } to { opacity: 1; filter: blur(0); } }
@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
  .nav-ink { transition: none; }
}

/* ---------- solve page: a fixed workspace (solve.js initWorkspace) ----------
   Two panes fill the window (never shorter than 620 px); each scrolls inside itself, so the page doesn't grow. */
.ws-views { display: none; margin-bottom: 10px; }
.ws { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 16px; min-height: 620px; }
.ws-left { display: flex; flex-direction: column; padding: 0; min-height: 0; }
.ws-right { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.ws-tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--rule); flex: none; overflow-x: auto; scrollbar-width: none; }
.ws-left > .ws-tabs { padding: 0 10px; }
.ws-tabs button { position: relative; background: none; border: 0; border-bottom: 2px solid transparent; margin-bottom: -1px; padding: 9px 10px 8px;
  font: 500 10.5px var(--font-cyber); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ash); cursor: pointer; white-space: nowrap; }
.ws-tabs button:hover { color: var(--paper); }
.ws-tabs button[aria-selected="true"] { color: var(--paper); border-bottom-color: var(--crimson-bright); }
.ws-tabs button[hidden] { display: none; }
.ws-tabs #hintCount { color: var(--crimson-bright); margin-left: 2px; }
.dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--sakura); margin-left: 6px; vertical-align: 2px; }
.dot[hidden] { display: none; }
.ws-body { flex: 1; min-height: 0; overflow-y: auto; }
.ws-left .tpane { padding: 14px 16px 18px; }
.ws .editor-wrap { flex: none; height: 60%; min-height: 0; }
.ws .editor-wrap .CodeMirror { height: 100%; }
.ws-handle { flex: none; height: 12px; cursor: row-resize; position: relative; touch-action: none; }
.ws-handle::before { content: ""; position: absolute; left: 50%; top: 5px; width: 44px; height: 2px; margin-left: -22px; background: var(--rule-2); transition: background 0.15s, width 0.15s; }
.ws-handle:hover::before, .ws-handle:focus-visible::before, .ws-handle.dragging::before { background: var(--crimson-bright); width: 72px; margin-left: -36px; }
.ws-handle:focus-visible { outline: none; }
.console { flex: 1; min-height: 0; display: flex; flex-direction: column; border: 1px solid var(--rule); background: var(--ink); }
.console .tpane { padding: 10px 12px; container-type: inline-size; }
.console .results { margin: 0; }
.ws .solve-actions { flex: none; margin: 10px 0 0; }

/* left pane contents */
.peek { margin: 0 0 12px; border: 1px solid var(--rule); background: var(--ink-2); }
.peek > summary { cursor: pointer; padding: 6px 10px; font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ash); }
.peek > summary:hover { color: var(--paper); }
.peek[open] > summary { border-bottom: 1px solid var(--rule); }
.peek .statement { padding: 8px 12px; max-height: 45vh; overflow-y: auto; font-size: 13px; }
.peek .statement h1 { font-size: 18px; }
.hintbox .who { background: none; border: 0; padding: 0; cursor: pointer; text-align: left; font: inherit; font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--crimson-bright); }
.hintbox.folded .body, .gmsg.folded .body { display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; color: var(--ash); }
.hintbox.folded .body > * { margin: 0; }
.hintbox.folded .body ol, .hintbox.folded .body ul { padding: 0; list-style: none; }
.hint-next { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 4px; }
.hint-next .quiet { font-size: 11.5px; }
.tpane .guide { margin: 0; }
.tpane .glog { max-height: none; overflow: visible; }
.gmsg .who { cursor: pointer; }
.gmsg.folded .gq { display: none; }

/* the console: example cases as chips */
.cases { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 8px; }
.case { font: 500 11px var(--font-cyber); letter-spacing: 0.08em; padding: 4px 10px; cursor: pointer; background: var(--ink-2); color: var(--paper); border: 1px solid var(--rule-2); }
.case.ok { color: var(--sakura); }
.case.bad { color: var(--crimson-bright); }
.case[aria-pressed="true"] { border-color: currentColor; }
.case-sum { margin-left: auto; font-size: 11px; color: var(--ash); }
.console .facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@container (max-width: 520px) { .console .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* the ⋯ menu */
.more { position: relative; }
.more > summary { list-style: none; font-size: 16px; letter-spacing: 0; padding: 4px 12px; }
.more > summary::-webkit-details-marker { display: none; }
.more-list { position: absolute; right: 0; bottom: calc(100% + 6px); z-index: 5; min-width: 190px; display: flex; flex-direction: column;
  background: var(--ink); border: 1px solid var(--rule-2); box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25); }
.more-list button { background: none; border: 0; text-align: left; padding: 9px 14px; font: 500 11px var(--font-cyber); letter-spacing: 0.12em; text-transform: uppercase; color: var(--paper); cursor: pointer; }
.more-list button:hover { background: var(--ink-2); }
.more-list button.warn { color: var(--crimson-bright); border-top: 1px solid var(--rule); }

/* narrow: switch between Problem, Code and Results instead of stacking them */
@media (max-width: 960px) {
  .ws-views { display: inline-flex; }
  .ws-views .dot { margin-left: 5px; }
  .ws { display: block; min-height: 0; }
  .ws-left .ws-body, .console .ws-body { overflow: visible; }
  .ws[data-view="problem"] .ws-right, .ws:not([data-view="problem"]) .ws-left { display: none; }
  .ws-handle { display: none; }
  .ws[data-view="code"] .console, .ws[data-view="results"] .editor-wrap { display: none; }
  .ws .editor-wrap { height: max(300px, 58vh); }
  .ws[data-view="results"] .console { min-height: 50vh; }
  .ws-left { min-height: 50vh; }
}
@media (min-width: 961px) { .wrap:has(> .ws) { padding-bottom: 0; } }  /* the workspace fills the window exactly */

/* the tutor model is unreachable: the controls that need it say so instead of failing after a click
   (the guide still works offline, from its step templates, so its ask box stays) */
body.llm-off #hintBtn, body.llm-off #explainBtn, body.llm-off #askBtn, body.llm-off #explainStep, body.llm-off #reviewBtn,
body.llm-off .ask:not(#guideAsk) { opacity: 0.5; pointer-events: none; }
body.llm-off #hintBtn::after, body.llm-off #explainBtn::after, body.llm-off #askBtn::after, body.llm-off #explainStep::after,
body.llm-off #reviewBtn::after { content: "· tutor unavailable"; text-transform: none; letter-spacing: 0.02em; opacity: 0.85; }
body.llm-off .ask:not(#guideAsk) { flex-wrap: wrap; }
body.llm-off .ask:not(#guideAsk)::after { content: "The tutor is unavailable right now."; flex-basis: 100%; font-size: 11.5px; color: var(--ash); }
.llm-state { font-size: 12px; }
.llm-state.ok { color: var(--sakura); }
.llm-state.off { color: var(--crimson-bright); }

/* ---------- Just visiting (#/visit, visit.js) ---------- */
.visit { position: fixed; inset: 0; z-index: 90; background: var(--void); animation: breath-in 1s ease both; }
.visit-slot, .visit-slot .stage { position: absolute; inset: 0; height: 100%; min-height: 0; border: 0; }
.visit-slot .stage.day::after { display: none; }
.visit .hud, .visit .tip { display: none !important; }
.vt-top { position: absolute; top: 16px; left: 20px; z-index: 4; display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; pointer-events: none; }
.vt-mark { pointer-events: auto; font: 700 26px var(--font-zen); letter-spacing: 0.04em; color: var(--paper); text-decoration: none; text-shadow: 0 0 18px var(--hud-title-glow); }
.vt-sub { font-size: 10.5px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--crimson-bright); }
.vt-tray { position: absolute; top: 18px; right: 18px; z-index: 4; display: flex; gap: 6px; }
.vt-quick { display: inline-flex; gap: 6px; }
.quick.vt-res { font: 700 10.5px var(--font-cyber); letter-spacing: 0.06em; }
.vt-hint { position: absolute; left: 50%; transform: translateX(-50%); width: max-content; max-width: calc(100% - 32px); bottom: 82px; z-index: 3;
  margin: 0; padding: 6px 12px; text-align: center; pointer-events: none; background: var(--hud-bg); backdrop-filter: blur(3px);
  font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ash); transition: opacity 1.6s; }
.visit.settled .vt-hint { opacity: 0; }
.vt-season { position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%); z-index: 4; display: flex; align-items: center; gap: 12px;
  padding: 8px 14px; background: var(--hud-bg); border: 1px solid var(--rule-2); backdrop-filter: blur(3px); }
.vt-sl, .vt-sv { font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ash); white-space: nowrap; }
.vt-sv { min-width: 104px; color: var(--paper); }
.vt-season input { width: min(240px, 36vw); accent-color: var(--sakura); }
.vt-bridge { position: absolute; right: 20px; bottom: 28px; z-index: 4; max-width: 290px; text-align: right; font-size: 11.5px; line-height: 1.5; color: var(--ash); text-decoration: none; }
.vt-bridge b { color: var(--paper); font-weight: 500; white-space: nowrap; }
a.vt-bridge:hover b { color: var(--sakura); }
p.vt-bridge { margin: 0; }
/* drifting: the controls step aside until you touch anything */
.vt-top, .vt-tray, .vt-season, .vt-bridge { transition: opacity 0.8s; }
.visit:has(.stage.contemplating) :is(.vt-top, .vt-tray, .vt-season, .vt-bridge, .vt-hint) { opacity: 0; pointer-events: none; }
.wl-visit { display: block; margin-top: 16px; font-size: 12px; color: var(--ash); text-decoration: none; }
.wl-visit:hover { color: var(--sakura); }
@media (max-width: 1000px) {
  .vt-bridge { left: 16px; right: 16px; bottom: 16px; max-width: none; text-align: center; }
  .vt-season { bottom: 52px; }
  .vt-hint { bottom: 110px; }
}
@media (max-width: 520px) {
  .vt-top { top: 14px; left: 14px; }
  .vt-sub { display: none; }
  .vt-tray { top: 14px; right: 12px; gap: 4px; }
  .vt-quick { gap: 4px; }
  .vt-tray .quick { width: 31px; height: 31px; }
  .vt-season { left: 12px; right: 12px; transform: none; padding: 8px 12px; }
  .vt-season input { flex: 1; width: auto; }
  .vt-sv { min-width: 0; }
}
@media (max-height: 500px) and (orientation: landscape) {
  .vt-hint { display: none; }
  .vt-season { bottom: 12px; }
  .vt-bridge { left: auto; right: 16px; bottom: 18px; max-width: 200px; text-align: right; }
}

/* the launch mailing list (static demo) */
.vt-ask { background: none; border: 0; padding: 0; font: inherit; color: inherit; text-align: inherit; cursor: pointer; line-height: 1.5; }
.vt-ask b { color: var(--paper); font-weight: 500; }
.vt-ask:hover b, .vt-ask:focus-visible b { color: var(--sakura); }
.vt-bridge.vt-form { max-width: 340px; padding: 10px 12px; background: var(--hud-bg); border: 1px solid var(--rule-2); backdrop-filter: blur(3px); text-align: left; }
.vt-signup { display: flex; gap: 6px; }
.vt-signup input[type="email"] { flex: 1; min-width: 0; font: 400 12.5px var(--font-cyber); color: var(--paper); background: var(--ink-2); border: 1px solid var(--rule-2); padding: 7px 9px; }
.vt-signup input[type="email"]:focus { outline: none; border-color: var(--sakura); }
.vt-signup .btn { padding: 7px 12px; }
.vt-hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.vt-note { margin: 6px 0 0; font-size: 11px; color: var(--ash); }
.vt-done b { color: var(--sakura); }
@media (max-width: 1000px) { .vt-bridge.vt-form { left: 12px; right: 12px; max-width: none; } }
@media (max-width: 1180px) {  /* the open form takes the bottom: the season slider steps up above it */
  .visit:has(.vt-form) .vt-season { bottom: 124px; }
  .visit:has(.vt-form) .vt-hint { display: none; }
}
@media (max-width: 380px) { .vt-tray { top: 54px; left: 12px; right: auto; } }  /* the narrowest phones: the tray gets its own row */