/* SAT Prep — "Study desk": a graphite sidebar, paper-grey desk, and a #2-pencil yellow accent used sparingly
   (active navigation, the daily goal ring, badges and highlights). Semantic green/amber/red are separate. */

:root {
  --bg: #F4F5F7;
  --surface: #FFFFFF;
  --surface-2: #ECEFF3;
  --ink: #1A1F25;
  --muted: #636D78;
  --rule: #E0E4E9;
  --side: #1F242B;
  --side-ink: #C3CAD2;
  --side-strong: #FFFFFF;
  --side-muted: #8B949E;
  --side-raise: rgb(255 255 255 / 0.07);
  --accent: #F2B01E;
  --accent-ink: #7A5500;
  --accent-soft: #FDF1D3;
  --good: #2F8A5B;
  --good-soft: #E2F2E9;
  --mid: #B37A06;
  --mid-soft: #FBF0D9;
  --low: #C4473A;
  --low-soft: #FBE7E4;
  --mark: #FFE08A;
  --focus: #1A1F25;
  --pop: 0 16px 40px -12px rgb(20 25 35 / 0.35);
  --display: "Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  --body: "Source Sans 3", "Segoe UI", system-ui, -apple-system, sans-serif;
  --sticky-top: 0px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121518;
    --surface: #1B1F25;
    --surface-2: #252B32;
    --ink: #E8EBEE;
    --muted: #9AA3AD;
    --rule: #2B3139;
    --side: #0B0D10;
    --side-ink: #C3CAD2;
    --side-strong: #FFFFFF;
    --side-muted: #7D8792;
    --side-raise: rgb(255 255 255 / 0.06);
    --accent: #F5C24A;
    --accent-ink: #F5C24A;
    --accent-soft: #3A3017;
    --good: #5CC28A;
    --good-soft: #173524;
    --mid: #E3B04B;
    --mid-soft: #3A2F14;
    --low: #EE7C6F;
    --low-soft: #3D1F1C;
    --mark: #6B5A12;
    --focus: #F5C24A;
    --pop: 0 16px 40px -12px rgb(0 0 0 / 0.7);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 var(--body); }
a { color: inherit; text-underline-offset: 2px; }
p a, .hint a, .note a, .eyebrow a { color: var(--ink); font-weight: 600; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--display); text-wrap: balance; margin: 0 0 0.6rem; }
h1 { font-size: clamp(26px, 3.2vw, 30px); font-weight: 800; line-height: 1.15; letter-spacing: -0.01em; }
h2 { font-size: 19px; font-weight: 700; line-height: 1.25; }
h3 { font-size: 16px; font-weight: 600; }
p { margin: 0 0 0.6rem; }
p:last-child { margin-bottom: 0; }
ul { padding-left: 1.2rem; margin: 0; }
li + li { margin-top: 6px; }
code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.9em; background: var(--surface-2); padding: 0 0.3em; border-radius: 4px; }
.muted { color: var(--muted); }
.hint { font-size: 14px; color: var(--muted); }
.warn { color: var(--mid); }
.nowrap { white-space: nowrap; }
.eyebrow { margin: 0; font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.big { display: block; font: 800 34px/1.1 var(--display); font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.range { display: block; color: var(--muted); font-size: 14px; }
.note { background: var(--surface-2); border-radius: 10px; padding: 10px 14px; color: var(--muted); font-size: 15px; }

/* ---------- app shell ---------- */
.shell { display: grid; grid-template-columns: 232px minmax(0, 1fr); min-height: 100vh; min-height: 100dvh; transition: grid-template-columns 0.18s ease; }
.shell.collapsed { grid-template-columns: 68px minmax(0, 1fr); }
.side {
  position: sticky; top: 0; height: 100vh; height: 100dvh; overflow-y: auto; overflow-x: hidden;
  display: flex; flex-direction: column; gap: 22px; padding: 22px 14px 16px;
  background: var(--side); color: var(--side-ink);
}
.side-head { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.brand { min-width: 0; overflow: hidden; font: 800 20px/1 var(--display); letter-spacing: -0.01em; color: var(--side-strong); text-decoration: none; padding: 4px 10px; white-space: nowrap; }
.collapse { flex: none; width: 32px; height: 32px; padding: 0; border: 0; border-radius: 8px; background: transparent; color: var(--side-muted); }
.collapse:hover:not(:disabled) { background: var(--side-raise); color: var(--side-strong); }
.collapse .icon { width: 18px; height: 18px; transition: transform 0.18s ease; }
.side-nav { display: grid; gap: 2px; }
.side-nav a { position: relative; display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px; color: var(--side-ink); text-decoration: none; white-space: nowrap; }
.side-nav a:hover { background: var(--side-raise); color: var(--side-strong); }
.side-nav .icon { width: 19px; height: 19px; color: var(--side-muted); }
.side-nav a:hover .icon, .side-nav a.on .icon { color: var(--side-strong); }
.side-nav a.on { background: rgb(255 255 255 / 0.09); color: var(--side-strong); box-shadow: inset 3px 0 0 var(--accent); }
.badge { margin-left: auto; background: var(--accent); color: #1A1F25; border-radius: 999px; font-size: 12px; font-weight: 700; line-height: 1; padding: 3px 7px; }
.badge.live { font-size: 0; width: 9px; height: 9px; padding: 0; flex: none; }
.streak { margin-top: auto; display: flex; align-items: center; gap: 12px; min-width: 0; }
.streak-count { flex: none; display: grid; place-items: center; min-width: 40px; height: 40px; padding: 0 6px; border-radius: 10px; background: var(--side-raise); color: var(--side-muted); font: 800 17px/1 var(--display); font-variant-numeric: tabular-nums; }
.streak.on .streak-count { background: var(--accent); color: #1A1F25; }
.streak .label { display: grid; gap: 1px; min-width: 0; flex: 1; white-space: nowrap; }
.streak strong { color: var(--side-strong); font-weight: 600; font-size: 15px; }
.streak .label > span { font-size: 13px; color: var(--side-muted); }
.goal-bar { display: block; height: 4px; margin-top: 5px; border-radius: 999px; background: rgb(255 255 255 / 0.12); overflow: hidden; }
.goal-bar > i { display: block; height: 100%; border-radius: inherit; background: var(--accent); }
.sync { display: flex; align-items: center; gap: 9px; padding: 8px 10px; border-radius: 8px; color: var(--side-ink); font-size: 14px; text-decoration: none; white-space: nowrap; }
.sync:hover, .sync.on { background: var(--side-raise); color: var(--side-strong); }
.sync .label { min-width: 0; }
.sync small { display: block; max-width: 160px; overflow: hidden; text-overflow: ellipsis; color: var(--side-muted); font-size: 12px; }
.dot { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--side-muted); }
.dot.ok { background: var(--good); }
.dot.bad { background: var(--low); }

/* Collapsing only narrows the column and fades the text. Icons, links and the streak count keep their size and
   position in both states, so nothing jumps or rewraps while the width animates. */
.side .label, .side .brand { transition: opacity 0.12s ease 0.1s, visibility 0s linear 0s; }
.shell.collapsed .side .label, .shell.collapsed .side .brand { opacity: 0; visibility: hidden; transition: opacity 0.1s ease, visibility 0s linear 0.1s; }
.shell.collapsed .collapse .icon { transform: rotate(180deg); }
.shell.collapsed .side-nav .badge { position: absolute; top: 2px; left: 20px; margin: 0; font-size: 10.5px; padding: 2px 5px; }
.shell.collapsed .side-nav .badge.live { font-size: 0; width: 9px; height: 9px; padding: 0; top: 6px; left: 26px; }

.topbar, .tabs, .sheet { display: none; }

#view { width: 100%; max-width: 1100px; justify-self: center; min-width: 0; padding: 30px clamp(16px, 3.5vw, 40px) 64px; container-type: inline-size; }
#view > * { margin-top: 0; margin-bottom: 0; }
#view > * + * { margin-top: 16px; }
#view > .page-head + *, #view > h1 + * { margin-top: 18px; }

.icon { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon-more { fill: currentColor; stroke: none; }

@media (max-width: 820px) {
  :root { --sticky-top: 56px; }
  /* Rows: the top bar keeps its height and the page takes the rest, even when the page is shorter than the screen. */
  .shell, .shell.collapsed { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto 1fr; }
  .side { display: none; }
  .topbar {
    display: flex; align-items: center; gap: 6px; position: sticky; top: 0; z-index: 30;
    height: 56px; padding: 0 8px 0 max(16px, env(safe-area-inset-left)); background: var(--side); color: var(--side-ink);
  }
  .topbar .brand { font-size: 18px; padding: 0; margin-right: auto; }
  .top-streak { display: flex; align-items: center; gap: 4px; padding: 8px 10px; color: var(--side-muted); font-weight: 700; font-size: 16px; text-decoration: none; font-variant-numeric: tabular-nums; }
  .top-streak .icon { width: 20px; height: 20px; }
  .top-streak.on { color: var(--side-strong); }
  .top-streak.on .icon { color: var(--accent); fill: color-mix(in srgb, var(--accent) 35%, transparent); }
  .top-sync { display: grid; place-items: center; width: 40px; height: 40px; }
  .tabs {
    display: grid; grid-template-columns: repeat(5, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
    background: var(--side); padding: 6px max(6px, env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(6px, env(safe-area-inset-left));
  }
  .tabs a, .tabs button {
    position: relative; display: grid; justify-items: center; gap: 2px; padding: 6px 0 4px; min-height: 52px;
    border: 0; border-radius: 10px; background: none; color: var(--side-muted); font: 600 12px/1.2 var(--body); text-decoration: none;
  }
  .tabs .on { color: var(--side-strong); }
  .tabs .on .icon { color: var(--accent); }
  .tabs .badge { position: absolute; top: 2px; left: calc(50% + 6px); margin: 0; font-size: 11px; padding: 2px 5px; }
  .tabs .badge.live { font-size: 0; width: 9px; height: 9px; padding: 0; top: 6px; left: calc(50% + 9px); }
  .sheet {
    display: grid; gap: 2px; position: fixed; z-index: 31; left: 12px; right: 12px;
    bottom: calc(76px + env(safe-area-inset-bottom)); padding: 8px; border-radius: 16px; background: var(--surface); box-shadow: var(--pop);
  }
  .sheet a { display: flex; justify-content: space-between; align-items: center; padding: 13px 14px; border-radius: 10px; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 17px; }
  .sheet a.on { background: var(--accent-soft); }
  .sheet a span { color: var(--muted); font-size: 20px; line-height: 1; }
  #view { padding: 20px 16px calc(96px + env(safe-area-inset-bottom)); }
}

/* ---------- controls ---------- */
button, .button {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: 600 15px/1.2 var(--body); padding: 9px 16px; border-radius: 999px; border: 1px solid var(--rule);
  background: var(--surface); color: var(--ink); cursor: pointer; text-decoration: none;
}
button:hover:not(:disabled), .button:hover { border-color: var(--ink); }
button:disabled { opacity: 0.45; cursor: not-allowed; }
.primary { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.primary:hover:not(:disabled) { background: color-mix(in srgb, var(--ink) 86%, var(--bg)); }
.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.ghost:hover:not(:disabled) { color: var(--ink); border-color: var(--rule); }
.ghost.active { background: var(--accent-soft); color: var(--accent-ink); border-color: transparent; }
.small { padding: 6px 12px; font-size: 14px; }
.danger { color: var(--low); }
.danger:hover:not(:disabled) { border-color: var(--low); }
.chip { padding: 6px 12px; font-size: 14px; }
.chip.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-ink); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.card .actions, .empty .actions { margin-top: 14px; }
input, select { font: inherit; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--rule); background: var(--surface); color: var(--ink); max-width: 100%; }
input:focus-visible, select:focus-visible { outline-offset: 0; }
.field { display: grid; gap: 4px; margin-bottom: 14px; font-weight: 600; font-size: 14px; }
.field input { font-weight: 400; font-size: 16px; width: 100%; max-width: 300px; }

/* ---------- surfaces ---------- */
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--surface); border-radius: 14px; padding: 18px 20px; min-width: 0; }
.card + .card { margin-top: 14px; }
.cards > .card + .card { margin-top: 0; }
.card > .big + .muted { margin-top: 2px; }
.empty { background: var(--surface); border-radius: 14px; text-align: center; padding: 48px 20px; }
.empty > p { max-width: 52ch; margin-inline: auto; color: var(--muted); }
.empty .actions, .empty > .button, .empty > button { justify-content: center; margin-top: 14px; }

.bar { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; justify-content: space-between; }
.bar h1 { margin: 0; }
.seg { display: inline-flex; background: var(--surface-2); border-radius: 999px; padding: 3px; }
.seg a { padding: 6px 14px; border-radius: 999px; color: var(--muted); text-decoration: none; font-weight: 600; font-size: 14px; }
.seg a.active { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgb(0 0 0 / 0.1); }
.tally { color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }

/* ---------- dashboard ---------- */
.page-head h1 { margin: 2px 0 0; }
.today-mobile { display: none; }
.next { background: var(--surface); border-radius: 14px; padding: 18px 20px; display: flex; flex-wrap: wrap; gap: 14px 24px; align-items: center; justify-content: space-between; }
.next h2 { font-size: 20px; font-weight: 600; margin: 3px 0 2px; }
.next p { margin: 0; }
.scores { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 14px; }
.score { background: var(--surface); border-radius: 14px; padding: 14px 18px 16px; display: grid; align-content: start; gap: 2px; }
.score.total { background: var(--accent-soft); }
.score.total .eyebrow, .score.total .range { color: var(--accent-ink); }
.skills { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: start; }
.skills > section { background: var(--surface); border-radius: 14px; padding: 18px 20px; }
.skill-row { display: grid; grid-template-columns: minmax(0, 1fr) 96px minmax(3.6rem, auto); gap: 12px; align-items: center; padding: 4px 0; font-size: 15px; }
.skill-row .name { min-width: 0; overflow-wrap: anywhere; }
.track { height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.fill { height: 100%; border-radius: inherit; background: var(--ink); }
.fill.high { background: var(--good); }
.fill.mid { background: var(--mid); }
.fill.low { background: var(--low); }
.pct { text-align: right; font-size: 13px; font-weight: 600; color: var(--muted); font-variant-numeric: tabular-nums; }
.domain-label { font-size: 11.5px; font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); margin: 14px 0 2px; }
h2 + .domain-label { margin-top: 4px; }

@media (max-width: 820px) {
  .today-mobile { display: block; }
  .today-mobile .streak { max-width: 360px; }
  .today-mobile .streak-count { background: var(--surface-2); color: var(--muted); }
  .today-mobile .streak.on .streak-count { background: var(--accent); color: #1A1F25; }
  .today-mobile .streak strong { color: var(--ink); }
  .today-mobile .streak .label > span { color: var(--muted); }
  .today-mobile .goal-bar { background: var(--surface-2); }
}
@container (max-width: 760px) {
  .scores { grid-template-columns: 1fr 1fr; }
  .score.total { grid-column: 1 / -1; }
  .skills { grid-template-columns: 1fr; }
  .next .button { width: 100%; }
}
@container (max-width: 420px) {
  .skill-row { grid-template-columns: minmax(0, 1fr) 56px minmax(3.2rem, auto); gap: 10px; }
  .big { font-size: 30px; }
}

/* ---------- questions ---------- */
.question { background: var(--surface); border-radius: 14px; padding: 20px 22px; }
.question .meta { font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.q-read { margin-bottom: 16px; }
.passage { background: var(--surface-2); border-radius: 10px; padding: 14px 16px; font-size: 16.5px; line-height: 1.7; }
.passage p { margin-bottom: 0.8em; }
.passage p:last-child { margin-bottom: 0; }
mark { background: var(--mark); color: inherit; border-radius: 2px; padding: 0 1px; }
.highlighting .passage { cursor: text; }
.figure, .qimg { display: block; max-width: 100%; height: auto; background: #fff; border-radius: 6px; }
/* Export crops are sized for about 12px text. On narrow screens they shrink to at most 80% of that and scroll
   sideways inside their own box, rather than shrinking until the text can't be read. */
.qimg[style*="--w"] { width: min(var(--w), max(100%, calc(var(--w) * 0.8))); max-width: none; }
.prompt-image, .answer-image, .rationale, details.original { overflow-x: auto; }
.choice-btn .qimg { max-width: 100%; }
/* Exported question images are black on white; in dark mode, invert them so they don't glare. */
@media (prefers-color-scheme: dark) { .figure, .qimg { filter: invert(0.9) hue-rotate(180deg); } }
.figure { margin: 12px auto 0; }
.stem { font-weight: 600; font-size: 16.5px; margin-bottom: 14px; }
.prompt-image { margin-bottom: 14px; }
@container (min-width: 820px) {
  .question.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); padding: 0; }
  .question.split .meta { grid-column: 1 / -1; margin: 0; padding: 14px 24px 0; }
  .question.split .q-read { margin: 0; padding: 20px 26px 26px; border-right: 1px solid var(--rule); }
  .question.split .passage { background: none; padding: 0; border-radius: 0; }
  .question.split .q-work { padding: 20px 26px 26px; }
}

.choices { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.choices li { display: flex; gap: 6px; align-items: stretch; margin: 0; }
.choice-btn {
  flex: 1; min-width: 0; justify-content: flex-start; gap: 12px; text-align: left;
  padding: 10px 14px; border-radius: 12px; border: 1.5px solid var(--rule); background: var(--surface);
  font: 400 16px/1.4 var(--body);
}
.choice-btn:hover:not(:disabled) { border-color: var(--muted); }
.choice-btn:disabled { opacity: 1; cursor: default; }
.letter { flex: none; width: 30px; height: 30px; border-radius: 50%; border: 1.5px solid var(--muted); display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.choice-btn .qimg { min-width: 0; flex: 0 1 auto; }
.selected .choice-btn { border-color: var(--ink); background: var(--accent-soft); }
.selected .letter { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.eliminated .choice-btn > span:not(.letter):not(.tag) { text-decoration: line-through; opacity: 0.5; }
.eliminated .choice-btn .qimg, .eliminated .letter { opacity: 0.45; }
.correct .choice-btn { border-color: var(--good); background: var(--good-soft); }
.correct .letter { background: var(--good); border-color: var(--good); color: var(--surface); opacity: 1; }
.wrong .choice-btn { border-color: var(--low); background: var(--low-soft); }
.wrong .letter { background: var(--low); border-color: var(--low); color: var(--surface); }
.tag { margin-left: auto; flex: none; padding-left: 8px; font-size: 13px; font-weight: 700; white-space: nowrap; }
.tag.ok { color: var(--good); }
.tag.bad { color: var(--low); }
.strike { flex: none; width: 42px; padding: 0; border-radius: 12px; border: 1.5px solid transparent; background: transparent; color: var(--muted); font-size: 14px; }
.strike:hover:not(:disabled) { border-color: var(--rule); color: var(--ink); }
.eliminated .strike { background: var(--surface-2); color: var(--ink); }
.spr { display: grid; gap: 6px; max-width: 300px; font-weight: 600; font-size: 14px; }
.spr input { font-size: 18px; font-weight: 400; }

.feedback { margin-top: 16px; padding: 14px 16px; border-radius: 12px; background: var(--surface-2); }
.feedback.ok { background: var(--good-soft); }
.feedback.bad { background: var(--low-soft); }
.feedback.ok > strong { color: var(--good); }
.feedback.bad > strong { color: var(--low); }
.feedback .actions { margin-top: 12px; }
.rationale { margin-top: 10px; }
.answer-image .qimg, .rationale .qimg { margin-top: 6px; }
details.original { margin-top: 12px; }
details.original summary { cursor: pointer; color: var(--muted); font-size: 14px; }
details.original .qimg { margin-top: 8px; }
.reasons { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.reasons > span { color: var(--muted); font-size: 14px; margin-right: 4px; }

/* ---------- timed test ---------- */
.test { display: grid; gap: 14px; }
.test-bar {
  position: sticky; top: var(--sticky-top); z-index: 20; display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between;
  background: var(--surface); border-radius: 14px; padding: 8px 10px 8px 16px; box-shadow: 0 1px 0 var(--rule), 0 6px 16px -12px rgb(0 0 0 / 0.3);
}
.test-bar > div { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 17px; padding: 4px 12px; border-radius: 999px; background: var(--surface-2); }
.timer.warn { color: var(--low); background: var(--low-soft); }
.timer.concealed { visibility: hidden; }
.tools { display: flex; gap: 6px; flex-wrap: wrap; }
.test-body { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); align-items: start; }
.panel { background: var(--surface); border-radius: 14px; padding: 14px; }
@container (min-width: 900px) {
  .test-body.with-panel { grid-template-columns: minmax(0, 1fr) minmax(0, 360px); }
  .test-body.with-panel .panel { position: sticky; top: calc(var(--sticky-top) + 70px); }
}
.q-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.qnum { background: var(--ink); color: var(--bg); font-weight: 700; padding: 2px 10px; border-radius: 6px; font-variant-numeric: tabular-nums; }
.flag.on { color: var(--low); }
.test-foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 14px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(46px, 1fr)); gap: 8px; margin-top: 12px; background: var(--surface); border-radius: 14px; padding: 14px; }
.card .grid { background: none; padding: 0; }
.grid button { position: relative; padding: 9px 0; border-radius: 10px; font-variant-numeric: tabular-nums; }
.grid .answered { background: var(--accent-soft); border-color: var(--accent); }
.grid .current { outline: 2px solid var(--ink); outline-offset: 1px; }
.grid .flagged::after { content: "⚑"; position: absolute; top: -8px; right: -4px; color: var(--low); font-size: 13px; }
.legend { font-size: 13px; color: var(--muted); margin-top: 8px; }
.ref dl { margin: 0; }
.ref dt { font-weight: 700; margin-top: 10px; }
.ref dd { margin: 0; }
#view > .review-item + .review-item { margin-top: 6px; }
details.review-item { background: var(--surface); border-radius: 12px; }
details.review-item summary { cursor: pointer; padding: 11px 14px; display: flex; gap: 10px; }
details.review-item .question { border-top: 1px solid var(--rule); border-radius: 0 0 12px 12px; }
.mark-ok { color: var(--good); font-weight: 700; }
.mark-bad { color: var(--low); font-weight: 700; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { color: var(--muted); font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tbody tr:last-child td { border-bottom: 0; }
@container (max-width: 560px) {
  table.stack thead { display: none; }
  table.stack, table.stack tbody, table.stack tr, table.stack td { display: block; width: 100%; }
  table.stack tr { padding: 10px 0; border-bottom: 1px solid var(--rule); }
  table.stack tbody tr:last-child { border-bottom: 0; }
  table.stack td { border: 0; padding: 2px 0; }
  table.stack td:first-child { font-weight: 600; }
  table.stack td[data-label]::before { content: attr(data-label) ": "; color: var(--muted); font-size: 14px; }
}

/* ---------- resources ---------- */
.links { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.links li { display: flex; flex-direction: column; gap: 2px; margin: 0; }
.links a { font-weight: 700; text-decoration: none; }
.links a:hover { text-decoration: underline; }

/* ---------- calculator ---------- */
.desmos { height: 460px; }
.sci input[name="expr"] { width: 100%; font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.sci-row { display: flex; justify-content: space-between; align-items: center; margin: 10px 0; }
.sci-history { list-style: none; padding: 0; margin: 6px 0; font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 14px; max-height: 220px; overflow-y: auto; overflow-wrap: anywhere; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }