/* ==========================================================================
   Views: home, roadmap, topic, labs, recall, notes, interview, progress
   ========================================================================== */

/* ---------- home ---------- */
.hero { padding-block: clamp(46px, 9vw, 104px) clamp(30px, 5vw, 56px); position: relative; overflow: hidden; }
.hero-in { position: relative; z-index: 2; }
.hero h1 { font-size: var(--fs-hero); letter-spacing: -0.035em; line-height: 1.04; max-width: 15ch; }
.hero h1 .dim { color: var(--ink-4); }
.hero-sub { margin-top: 20px; font-size: clamp(1.0625rem, 2.1vw, 1.3125rem); color: var(--ink-3); max-width: 54ch; line-height: 1.5; letter-spacing: -0.012em; }
.hero-acts { margin-top: 30px; }
.hero-fine { margin-top: 18px; font-size: var(--fs-small); color: var(--ink-4); display: flex; gap: 16px; flex-wrap: wrap; }
.hero-fine span { display: inline-flex; align-items: center; gap: 6px; }
.hero-fine svg { width: 14px; height: 14px; }

/* ambient constellation behind hero — pure decoration, very faint */
.hero-canvas { position: absolute; inset: 0; z-index: 1; opacity: .5; pointer-events: none; }
:root[data-motion="still"] .hero-canvas { display: none; }

/* stat strip */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(128px, 100%), 1fr)); border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface); overflow: hidden; }
.stat { padding: 16px 18px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: 0; }
.stat b { display: block; font-size: 1.6rem; font-weight: 600; letter-spacing: -0.03em; color: var(--ink); font-variant-numeric: tabular-nums; }
.stat span { font-size: var(--fs-fine); color: var(--ink-3); }
@media (max-width: 620px) { .stat { border-left: 0; border-top: 1px solid var(--line); } .stat:first-child { border-top: 0; } }

/* feature rows — deliberately not all cards */
.feat { display: grid; gap: clamp(20px, 4vw, 48px); align-items: center; grid-template-columns: 1fr; }
@media (min-width: 860px) { .feat { grid-template-columns: 1fr 1.15fr; } .feat[data-flip] .feat-vis { order: -1; } }
.feat + .feat { margin-top: clamp(44px, 7vw, 86px); }
.feat-txt h3 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.026em; }
.feat-txt p { margin-top: 12px; color: var(--ink-3); font-size: var(--fs-read); line-height: 1.58; max-width: 46ch; }
.feat-txt ul { margin: 16px 0 0; padding-left: 0; list-style: none; display: flex; flex-direction: column; gap: 8px; }
.feat-txt li { display: flex; gap: 10px; font-size: var(--fs-body); color: var(--ink-2); }
.feat-txt li::before { content: ""; width: 5px; height: 5px; border-radius: 99px; background: var(--accent); margin-top: .58em; flex: none; }
.feat-vis { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); padding: 18px; box-shadow: var(--lift-1); overflow: hidden; }

/* ---------- roadmap ---------- */
.rm-head { display: flex; gap: 20px; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; }
.rm-legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: var(--fs-fine); color: var(--ink-3); }
.rm-legend span { display: inline-flex; align-items: center; gap: 6px; }
.rm-legend i { width: 9px; height: 9px; border-radius: 99px; display: block; }

.stage-row { position: relative; padding-left: 0; }
.stage-row + .stage-row { margin-top: 10px; }
.stage-card {
  border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface);
  overflow: hidden; transition: border-color var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.stage-card:hover { border-color: var(--line-2); }
.stage-bar { display: flex; align-items: center; gap: 14px; width: 100%; padding: 16px 18px; text-align: left; }
.stage-idx {
  width: 30px; height: 30px; border-radius: 99px; flex: none; display: grid; place-items: center;
  font-family: var(--mono); font-size: var(--fs-fine); font-weight: 600;
  background: var(--hue, var(--accent)); background: oklch(from var(--hue, var(--accent)) min(l, var(--text-lmax)) c h); color: var(--on-hue); letter-spacing: -0.02em;
}
.stage-meta { flex: 1; min-width: 0; }
.stage-meta h3 { font-size: var(--fs-read); letter-spacing: -0.016em; }
.stage-meta p { font-size: var(--fs-small); color: var(--ink-3); margin-top: 2px; }
.stage-right { display: flex; align-items: center; gap: 14px; flex: none; }
.stage-count { font-size: var(--fs-fine); color: var(--ink-4); font-variant-numeric: tabular-nums; }
.stage-chev { width: 16px; height: 16px; color: var(--ink-4); transition: transform var(--t-mid) var(--ease); }
.stage-card[data-open="1"] .stage-chev { transform: rotate(90deg); }
.stage-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows var(--t-slow) var(--ease); }
.stage-card[data-open="1"] .stage-body { grid-template-rows: 1fr; }
.stage-body > div { overflow: hidden; }
.stage-inner { padding: 4px 18px 18px; border-top: 1px solid var(--line); display: grid; gap: 12px; }
.stage-note { font-size: var(--fs-small); color: var(--ink-3); padding-top: 14px; max-width: 62ch; }
.stage-track { display: grid; gap: 8px; }
.stage-track h4 { font-size: var(--fs-fine); text-transform: uppercase; letter-spacing: .07em; color: var(--hue, var(--ink-4)); color: oklch(from var(--hue, var(--ink-4)) min(l, var(--text-lmax)) c h); font-weight: 650; }
.rm-list { display: grid; gap: 6px; grid-template-columns: repeat(auto-fill, minmax(min(255px, 100%), 1fr)); }
.rm-item {
  display: flex; align-items: center; gap: 10px; padding: 9px 11px;
  border-radius: 9px; border: 1px solid transparent; color: var(--ink-2); font-size: var(--fs-small);
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.rm-item:hover { background: var(--surface-2); border-color: var(--line); text-decoration: none; color: var(--ink); transform: translateX(2px); }
.rm-item .rm-t { flex: 1; min-width: 0; }
.rm-item .rm-m { font-size: var(--fs-micro); color: var(--ink-4); font-variant-numeric: tabular-nums; flex: none; }
.rm-item[data-locked="1"] { opacity: .55; }

/* ---------- library ---------- */
.lib-bar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 20px; }
.lib-filters { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  padding: 5px 12px; border-radius: 99px; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink-3); font-size: var(--fs-fine); font-weight: 500;
  transition: all var(--t-fast) var(--ease); white-space: nowrap;
}
.chip:hover { color: var(--ink); border-color: var(--line-2); }
.chip[aria-pressed="true"] { background: var(--hue, var(--ink)); color: var(--ground); border-color: transparent; }
.lib-count { font-size: var(--fs-small); color: var(--ink-4); margin-left: auto; font-variant-numeric: tabular-nums; }

/* ---------- topic ---------- */
.topic-shell { display: grid; gap: clamp(22px, 4vw, 46px); grid-template-columns: minmax(0, 1fr); align-items: start; }
@media (min-width: 1000px) { .topic-shell { grid-template-columns: minmax(0, 1fr) 232px; } }
.topic-head { border-bottom: 1px solid var(--line); padding-bottom: 22px; margin-bottom: 26px; }
.crumb { display: flex; align-items: center; gap: 7px; font-size: var(--fs-fine); color: var(--ink-4); margin-bottom: 12px; flex-wrap: wrap; }
.crumb a { color: var(--ink-3); }
.crumb a:hover { color: var(--ink); }
.crumb .sep { opacity: .5; }
.topic-head h1 { font-size: clamp(1.9rem, 4.2vw, 2.7rem); letter-spacing: -0.03em; }
.topic-tag { margin-top: 12px; font-size: var(--fs-lead); color: var(--ink-3); max-width: 56ch; line-height: 1.45; letter-spacing: -0.012em; }
.topic-meta { display: flex; gap: 9px; align-items: center; flex-wrap: wrap; margin-top: 18px; }

.obj { border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface-2); padding: 16px 18px; max-width: var(--measure); }
.obj .obj-h { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-4); margin-bottom: 9px; }
.obj ul { margin: 0; padding-left: 1.1em; display: flex; flex-direction: column; gap: 5px; font-size: var(--fs-body); color: var(--ink-2); }

.topic-body > * + * { margin-top: clamp(20px, 2.6vw, 30px); }
.topic-body > h2 {
  font-size: var(--fs-h2); color: var(--ink); letter-spacing: -0.024em;
  margin-top: clamp(38px, 5vw, 60px) !important; padding-top: 4px; scroll-margin-top: 78px;
}
.topic-body > h2:first-child { margin-top: 0 !important; }
.topic-body > h3 { font-size: var(--fs-h3); color: var(--ink); margin-top: clamp(26px, 3vw, 34px) !important; scroll-margin-top: 78px; }
.topic-body p, .topic-body ul, .topic-body ol { max-width: var(--measure); font-size: var(--fs-read); line-height: 1.62; color: var(--ink-2); }
.topic-body ul, .topic-body ol { padding-left: 1.25em; display: flex; flex-direction: column; gap: .5em; }
.topic-body li::marker { color: var(--ink-4); }
.topic-body strong { color: var(--ink); font-weight: 600; }
.topic-body code { background: var(--surface-2); padding: .12em .38em; border-radius: 5px; border: 1px solid var(--line); font-size: .86em; color: var(--ink); }
.topic-body a { text-decoration: underline; text-decoration-color: var(--accent-line); text-underline-offset: 2.5px; }

/* rail */
.rail { position: sticky; top: calc(var(--chrome-h) + env(safe-area-inset-top, 0px) + 20px); display: flex; flex-direction: column; gap: 20px; }
@media (max-width: 999px) { .rail { position: static; } }
.rail-sec .rail-h { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-4); margin-bottom: 9px; }
.toc { display: flex; flex-direction: column; gap: 1px; border-left: 1px solid var(--line); }
.toc a {
  font-size: var(--fs-small); color: var(--ink-3); padding: 5px 0 5px 12px;
  border-left: 2px solid transparent; margin-left: -1px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.toc a:hover { color: var(--ink); text-decoration: none; }
.toc a[data-active="1"] { color: var(--ink); border-left-color: var(--accent); font-weight: 550; }
.toc a[data-sub="1"] { padding-left: 24px; font-size: var(--fs-fine); }

.rail-actions { display: flex; flex-direction: column; gap: 7px; }
.rail-actions .btn { justify-content: flex-start; width: 100%; height: auto; min-height: 34px; padding-block: 7px; white-space: normal; text-align: left; line-height: 1.3; }

/* next/prev */
.pager { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); margin-top: clamp(40px, 6vw, 64px); padding-top: 26px; border-top: 1px solid var(--line); }
.pager a { border: 1px solid var(--line); border-radius: var(--r-md); padding: 15px 17px; color: var(--ink); background: var(--surface); transition: all var(--t-mid) var(--ease); display: flex; flex-direction: column; gap: 3px; }
.pager a:hover { text-decoration: none; border-color: var(--line-2); box-shadow: var(--lift-2); transform: translateY(-2px); }
.pager small { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: .07em; color: var(--ink-4); }
.pager b { font-size: var(--fs-body); font-weight: 600; letter-spacing: -0.012em; }

/* refs inside a topic */
.reflist { display: flex; flex-direction: column; gap: 2px; max-width: var(--measure); }
.reflink { display: flex; align-items: baseline; gap: 10px; padding: 9px 11px; border-radius: 9px; color: var(--ink-2); font-size: var(--fs-body); transition: background var(--t-fast) var(--ease); }
.reflink:hover { background: var(--surface-2); text-decoration: none; }
.reflink .rk { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-4); font-weight: 650; flex: none; width: 58px; }
.reflink .rt { flex: 1; min-width: 0; }
.reflink .ra { font-size: var(--fs-fine); color: var(--ink-4); flex: none; }

/* ---------- labs ---------- */
.lab {
  border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface);
  overflow: hidden; max-width: 100%;
}
.lab-head { display: flex; align-items: center; gap: 12px; padding: 14px 17px; border-bottom: 1px solid var(--line); background: var(--surface-2); flex-wrap: wrap; }
.lab-head .lab-t { font-size: var(--fs-body); letter-spacing: -0.014em; }
.lab-head .pill { margin-left: auto; }
.lab-stage { padding: 18px 17px; position: relative; }
.lab-canvas { display: block; width: 100%; height: auto; }
.lab-ctl { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; padding: 14px 17px; border-top: 1px solid var(--line); background: var(--surface-2); }
.ctl { display: flex; flex-direction: column; gap: 4px; min-width: 150px; flex: 1 1 150px; }
.ctl label { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-4); font-weight: 600; display: flex; justify-content: space-between; gap: 8px; }
.ctl label b { color: var(--ink); font-family: var(--mono); font-variant-numeric: tabular-nums; text-transform: none; letter-spacing: 0; font-weight: 600; }
.ctl-inline { flex: 0 0 auto; min-width: 0; }
.lab-read { padding: 13px 17px; border-top: 1px solid var(--line); font-size: var(--fs-small); color: var(--ink-3); display: flex; gap: 18px; flex-wrap: wrap; }
.lab-read b { color: var(--ink); font-family: var(--mono); font-variant-numeric: tabular-nums; }
.lab-out { display: flex; flex-wrap: wrap; gap: 16px; }
.lab-out > div { display: flex; flex-direction: column; }
.lab-out .lo-v { font-family: var(--mono); font-size: 1.05rem; font-weight: 600; color: var(--ink); font-variant-numeric: tabular-nums; }
.lab-out .lo-l { font-size: var(--fs-micro); color: var(--ink-4); text-transform: uppercase; letter-spacing: .06em; }
.lab-why { padding: 14px 17px; border-top: 1px solid var(--line); font-size: var(--fs-small); color: var(--ink-3); line-height: 1.6; }
.lab-why b { color: var(--ink); }

/* ---------- recall (spaced repetition) ---------- */
.recall-wrap { max-width: 720px; margin: 0 auto; }
.card-face {
  border: 1px solid var(--line); border-radius: var(--r-xl); background: var(--surface);
  padding: clamp(26px, 5vw, 46px); min-height: 260px;
  display: flex; flex-direction: column; justify-content: center; gap: 18px;
  box-shadow: var(--lift-2);
}
.card-face .cf-q { font-size: clamp(1.15rem, 2.6vw, 1.5rem); color: var(--ink); letter-spacing: -0.02em; line-height: 1.35; text-wrap: balance; }
.card-face .cf-a { font-size: var(--fs-read); color: var(--ink-2); line-height: 1.6; border-top: 1px solid var(--line); padding-top: 18px; animation: revealUp var(--t-mid) var(--ease) both; }
@keyframes revealUp { from { opacity: 0; transform: translateY(7px) } to { opacity: 1; transform: none } }
.card-face .cf-src { font-size: var(--fs-fine); color: var(--ink-4); }
.card-face[data-flip="in"] { animation: cardIn var(--t-mid) var(--ease) both; }
@keyframes cardIn { from { opacity: 0; transform: translateY(12px) scale(.985) } to { opacity: 1; transform: none } }
.grade-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(96px, 100%), 1fr)); gap: 8px; margin-top: 16px; }
.grade { padding: 12px 8px; border-radius: var(--r-md); border: 1px solid var(--line); background: var(--surface); display: flex; flex-direction: column; align-items: center; gap: 3px; transition: all var(--t-fast) var(--ease); }
.grade:hover { border-color: var(--line-2); transform: translateY(-2px); box-shadow: var(--lift-2); }
.grade b { font-size: var(--fs-small); font-weight: 600; }
.grade span { font-size: var(--fs-micro); color: var(--ink-4); font-variant-numeric: tabular-nums; }
.grade[data-g="0"] b { color: var(--bad); } .grade[data-g="1"] b { color: var(--warn); }
.grade[data-g="2"] b { color: var(--ink); } .grade[data-g="3"] b { color: var(--good-text); }
.recall-meta { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 18px; font-size: var(--fs-small); color: var(--ink-3); flex-wrap: wrap; }

/* ---------- notes ---------- */
.notes-shell { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 940px) { .notes-shell { grid-template-columns: 216px minmax(0,1fr); } }
.notes-side { display: flex; flex-direction: column; gap: 14px; }
.notes-list { display: flex; flex-direction: column; gap: 1px; max-height: 360px; overflow-y: auto; }
.notes-list a { padding: 8px 10px; border-radius: 8px; font-size: var(--fs-small); color: var(--ink-3); display: flex; gap: 8px; align-items: center; }
.notes-list a:hover { background: var(--surface-2); color: var(--ink); text-decoration: none; }
.notes-list a[data-active="1"] { background: var(--accent-soft); color: var(--ink); font-weight: 550; }
.notes-list .nl-dot { width: 6px; height: 6px; border-radius: 99px; background: var(--good); flex: none; }

.pad { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); overflow: hidden; }
.pad-bar { display: flex; align-items: center; gap: 8px; padding: 10px 13px; border-bottom: 1px solid var(--line); background: var(--surface-2); flex-wrap: wrap; }
.pad-pens { display: flex; gap: 4px; }
.pen { width: 28px; height: 28px; border-radius: 99px; border: 1.5px solid var(--line-2); display: grid; place-items: center; transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease); }
.pen i { width: 13px; height: 13px; border-radius: 99px; display: block; }
.pen[aria-pressed="true"] { border-color: var(--ink); transform: scale(1.08); }
.pen-erase i { background: repeating-linear-gradient(45deg, var(--line-2) 0 3px, transparent 3px 6px); border: 1px solid var(--line-2); }
.pad-sizes { display: flex; gap: 4px; }
.psz { width: 26px; height: 26px; border-radius: 7px; display: grid; place-items: center; border: 1px solid var(--line); transition: all var(--t-fast) var(--ease); }
.psz i { background: var(--ink-3); border-radius: 99px; display: block; }
.psz[aria-pressed="true"] { background: var(--surface); border-color: var(--ink-4); box-shadow: var(--lift-1); }
.psz[aria-pressed="true"] i { background: var(--ink); }
.pad-right { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.pad-canvas-wrap { position: relative; background: var(--surface); }
.pad-canvas { display: block; width: 100%; touch-action: none; cursor: crosshair; }
.pad-guides { position: absolute; inset: 0; pointer-events: none; }
.pad-foot { display: flex; align-items: center; gap: 12px; padding: 9px 13px; border-top: 1px solid var(--line); font-size: var(--fs-fine); color: var(--ink-4); flex-wrap: wrap; }
.cue-strip { display: flex; gap: 8px; flex-wrap: wrap; padding: 12px 13px; border-bottom: 1px solid var(--line); background: var(--surface); }
.cue { font-size: var(--fs-fine); padding: 4px 10px; border-radius: 99px; background: var(--surface-2); border: 1px dashed var(--line-2); color: var(--ink-3); }

/* ---------- interview ---------- */
.iv-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }
.iv-room { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1000px) { .iv-room { grid-template-columns: 300px minmax(0,1fr); } }
.iv-panel > h2 { letter-spacing: -0.01em; }
.iv-panel { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); padding: 18px; display: flex; flex-direction: column; gap: 13px; }
.iv-clock { font-family: var(--mono); font-size: 2.1rem; font-weight: 600; letter-spacing: -0.03em; color: var(--ink); font-variant-numeric: tabular-nums; }
.iv-clock[data-warn="1"] { color: var(--warn); }
.iv-clock[data-warn="2"] { color: var(--bad); }
.iv-phase { display: flex; flex-direction: column; gap: 2px; }
.iv-phase-row { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 9px; font-size: var(--fs-small); color: var(--ink-3); transition: background var(--t-mid) var(--ease); }
.iv-phase-row[data-now="1"] { background: var(--accent-soft); color: var(--ink); font-weight: 550; }
.iv-phase-row[data-done="1"] { color: var(--ink-4); }
.iv-phase-row .ip-t { flex: 1; }
.iv-phase-row .ip-m { font-variant-numeric: tabular-nums; font-size: var(--fs-micro); color: var(--ink-3); }
.rubric { display: flex; flex-direction: column; gap: 10px; }
.rub-row { display: flex; flex-direction: column; gap: 5px; }
.rub-row .rr-head { display: flex; justify-content: space-between; font-size: var(--fs-small); }
.rub-row .rr-head b { font-weight: 550; }
.rub-dots { display: flex; gap: 5px; }
.rub-dot { width: 22px; height: 22px; border-radius: 7px; border: 1px solid var(--line); background: var(--surface-2); font-size: var(--fs-micro); color: var(--ink-4); display: grid; place-items: center; transition: all var(--t-fast) var(--ease); }
.rub-dot[aria-pressed="true"] { background: var(--accent); border-color: transparent; color: #fff; font-weight: 600; }

/* ---------- references ---------- */
.ref-sec + .ref-sec { margin-top: 34px; }
.ref-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(min(270px, 100%), 1fr)); }
.refcard { border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface); padding: 15px 16px; display: flex; flex-direction: column; gap: 5px; color: var(--ink); transition: all var(--t-mid) var(--ease); }
.refcard:hover { text-decoration: none; border-color: var(--line-2); box-shadow: var(--lift-2); transform: translateY(-2px); }
.refcard b { font-size: var(--fs-body); font-weight: 600; letter-spacing: -0.012em; }
.refcard span { font-size: var(--fs-small); color: var(--ink-3); }
.refcard .rc-meta { margin-top: auto; padding-top: 9px; display: flex; gap: 8px; align-items: center; font-size: var(--fs-micro); color: var(--ink-4); text-transform: uppercase; letter-spacing: .06em; }

/* ---------- progress ---------- */
.pg-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(230px, 100%), 1fr)); }
.pg-track { border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface); padding: 15px 16px; display: flex; flex-direction: column; gap: 10px; }
.pg-track .pt-head { display: flex; align-items: center; gap: 10px; }
.pg-track .pt-head b { font-size: var(--fs-body); flex: 1; }
.pg-track .pt-n { font-size: var(--fs-fine); color: var(--ink-4); font-variant-numeric: tabular-nums; }
.heat { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(11px, 100%), 1fr)); gap: 3px; }
.heat i { aspect-ratio: 1; border-radius: 3px; background: var(--surface-sunk); display: block; }
.heat i[data-v="1"] { background: color-mix(in srgb, var(--good) 32%, var(--surface-sunk)); }
.heat i[data-v="2"] { background: color-mix(in srgb, var(--good) 62%, var(--surface-sunk)); }
.heat i[data-v="3"] { background: var(--good); }


/* ---------- overflow containment ----------
   Grid and flex children default to min-width:auto, which means a wide code
   block, table or canvas inside them cannot shrink and the whole page scrolls
   sideways. Every layout track here is explicitly allowed to shrink instead,
   and the wide thing scrolls inside its own container. */
.topic-shell > *, .notes-shell > *, .iv-room > *,
.grid > *, .pg-grid > *, .iv-grid > *, .ref-grid > *,
.tradeoff > *, .numbers > *, .rm-list > *, .stage-inner > * { min-width: 0; }

.topic-body, .stage-inner, .lab, .lab-stage, .pad, .iv-panel { min-width: 0; }
.topic-body > *, .prose > * { max-width: 100%; }
.lab-stage { overflow-x: auto; }
.feat-txt, .feat-vis { min-width: 0; }