/* core/style.css - the house look: plain, readable, both themes. System fonts only, so pages work offline. */
:root {
  --bg: #fbfcfc; --fg: #17222c; --muted: #546371; --line: #d8dfe5; --soft: #eef3f6; --card: #ffffff;
  --accent: #1f6a8f; --accent-fg: #ffffff; --good: #2e7d4f; --good-soft: #e3f2e8; --bad: #b4412f; --bad-soft: #f8e6e2; --link: #1f6a8f;
  --water: #3f86c0; --solid: #c4893a; --vapor: #a9cfeb; --o2: #2f9a88; --n2: #a3b0bc; --co2: #7c6aa6; --sens: #e0a24a; --lat: #4f9bd1; --salt: #b46a3c; --on: #ffffff;
  --body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --num: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121a20; --fg: #e5ecf1; --muted: #9db0bf; --line: #2c3a45; --soft: #1b2630; --card: #172128;
    --accent: #6db6dc; --accent-fg: #0d1418; --good: #7fcf9e; --good-soft: #17301f; --bad: #f08a76; --bad-soft: #3a1d18; --link: #8cc8e8;
    --water: #5aa6dc; --solid: #d8a65a; --vapor: #2f5f80; --o2: #4cc1ad; --n2: #607281; --co2: #a28fd0; --sens: #c98a35; --lat: #3d82b5; --salt: #d08a5a; --on: #0d1418;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121a20; --fg: #e5ecf1; --muted: #9db0bf; --line: #2c3a45; --soft: #1b2630; --card: #172128;
  --accent: #6db6dc; --accent-fg: #0d1418; --good: #7fcf9e; --good-soft: #17301f; --bad: #f08a76; --bad-soft: #3a1d18; --link: #8cc8e8;
  --water: #5aa6dc; --solid: #d8a65a; --vapor: #2f5f80; --o2: #4cc1ad; --n2: #607281; --co2: #a28fd0; --sens: #c98a35; --lat: #3d82b5; --salt: #d08a5a; --on: #0d1418;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.55 var(--body); }
main { max-width: 860px; margin: 0 auto; padding: 24px 16px 56px; }
a { color: var(--link); }
h1 { font-size: 1.7rem; line-height: 1.2; margin: 4px 0 8px; text-wrap: balance; }
h2 { font-size: 1.25rem; margin: 28px 0 10px; text-wrap: balance; }
h3 { font-size: 1.05rem; margin: 20px 0 6px; }
p { margin: 0 0 12px; max-width: 68ch; }
.eyebrow { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); font-weight: 700; margin: 0; }
.muted { color: var(--muted); }
.formula { font-family: var(--num); font-size: .95rem; background: var(--soft); border-radius: 8px; padding: 10px 14px; margin: 4px 0 14px; overflow-x: auto; white-space: pre-wrap; }
.callout { border-left: 4px solid var(--accent); background: var(--soft); border-radius: 0 8px 8px 0; padding: 10px 14px; margin: 14px 0; max-width: 68ch; }
.callout.trap { border-left-color: var(--bad); }
.callout b { display: block; margin-bottom: 2px; }

/* tabs and controls */
.bar { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; margin: 16px 0 8px; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tabs button, .seg button { font: inherit; font-size: .92rem; border: 1px solid var(--line); background: var(--card); color: var(--fg); padding: 6px 14px; border-radius: 999px; cursor: pointer; }
.tabs button[aria-selected="true"], .seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.seg { display: flex; gap: 4px; align-items: center; font-size: .85rem; color: var(--muted); flex-wrap: wrap; }
.seg button { font-size: .82rem; padding: 4px 10px; }
button:focus-visible, a:focus-visible, input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn { font: inherit; border: 0; background: var(--accent); color: var(--accent-fg); padding: 9px 18px; border-radius: 8px; cursor: pointer; font-weight: 600; }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn:disabled { opacity: .45; cursor: default; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 14px; }

/* lesson list */
.lessons { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.lessons button { all: unset; box-sizing: border-box; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 4px 14px; width: 100%; padding: 14px 16px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; cursor: pointer; }
.lessons button:hover { border-color: var(--accent); }
.lessons button:focus-visible { outline: 2px solid var(--accent); }
.lessons .n { font-family: var(--num); color: var(--accent); font-weight: 600; }
.lessons .t { font-weight: 600; }
.lessons .m { color: var(--muted); font-size: .88rem; text-align: right; white-space: nowrap; }
.lessons .d { grid-column: 2 / -1; color: var(--muted); font-size: .9rem; }

/* a problem */
.problem { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin: 12px 0; }
.problem .stem { font-size: 1.02rem; margin-bottom: 14px; max-width: none; }
.choices { display: grid; gap: 8px; }
.choice { display: flex; gap: 10px; align-items: flex-start; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; cursor: pointer; }
.choice input { margin-top: 4px; }
.choice .v { font-family: var(--num); font-variant-numeric: tabular-nums; }
.choices.words .choice .v { font-family: inherit; }   /* concept statements read as words */
.choice .why { display: block; font-size: .86rem; color: var(--muted); margin-top: 2px; }
.choice.right { border-color: var(--good); background: var(--good-soft); }
.choice.wrong { border-color: var(--bad); background: var(--bad-soft); }
.verdict { font-weight: 700; margin: 12px 0 4px; }
.verdict.good { color: var(--good); } .verdict.bad { color: var(--bad); }
.steps { margin: 6px 0 0; padding-left: 1.3em; }
.steps li { margin: 4px 0; font-variant-numeric: tabular-nums; }
details { margin-top: 10px; }
summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.tally { font-size: .9rem; color: var(--muted); }

/* the reference sheet */
.ref { border-top: 1px solid var(--line); padding-top: 6px; }
.ref h3 { margin-top: 18px; }
.sym { width: 100%; border-collapse: collapse; font-size: .9rem; margin: 6px 0 4px; }
.sym td, .sym th { text-align: left; padding: 4px 8px 4px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.sym th { font-size: .75rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 600; }
.sym td:first-child { font-family: var(--num); white-space: nowrap; }
.scroll { overflow-x: auto; }

.notice { margin-top: 40px; font-size: .85rem; color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; }
.notice p { margin: 6px 0; max-width: 72ch; }
.err { background: var(--bad-soft); color: var(--fg); border-left: 4px solid var(--bad); padding: 12px 14px; border-radius: 0 8px 8px 0; }
@media (max-width: 560px) {
  body { font-size: 16px; }
  .lessons button { grid-template-columns: auto minmax(0, 1fr); }
  .lessons .m { grid-column: 2; text-align: left; }
}
select { font: inherit; max-width: 100%; min-width: 0; padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--card); color: var(--fg); }

/* the lesson visuals (core/visuals.js) */
.visual { margin: 18px 0; padding: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.v-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.visual svg { width: 100%; min-width: 560px; height: auto; display: block; }
.visual figcaption { font-size: .88rem; color: var(--muted); margin-top: 6px; }
.v-label { font: 13px var(--body); fill: var(--fg); }
.v-strong { font-weight: 600; } .v-muted { fill: var(--muted); }
.v-on { font: 600 12px var(--body); fill: var(--on); }
.v-vessel { fill: var(--soft); stroke: var(--muted); stroke-width: 2; }
.v-pipe { stroke: var(--muted); } .v-arrowhead { fill: var(--muted); }
.v-steam { stroke: var(--vapor); stroke-dasharray: 6 5; }
.v-feed { stroke: var(--accent); } .v-loop { stroke: var(--salt); }
.v-water { fill: var(--water); } .v-soft { opacity: .35; } .v-solid { fill: var(--solid); } .v-vapor { fill: var(--vapor); }
.v-o2 { fill: var(--o2); } .v-n2 { fill: var(--n2); } .v-co2 { fill: var(--co2); }
.v-sens { fill: var(--sens); } .v-lat { fill: var(--lat); } .v-area { opacity: .45; } .v-salt { fill: var(--salt); }
.v-axis { stroke: var(--muted); stroke-width: 1.5; } .v-grid { stroke: var(--line); stroke-width: 1.5; stroke-dasharray: 4 4; }
.v-line { stroke: var(--fg); stroke-width: 2.5; } .v-dash { stroke-dasharray: 7 6; stroke: var(--bad); }
.v-stroke-sens { stroke: var(--sens); stroke-width: 3; } .v-stroke-lat { stroke: var(--lat); stroke-width: 3; }
.v-step { stroke: var(--muted); stroke-width: 1.5; } .v-sw.v-step-sw { background: var(--muted); height: 2px; }
.v-dot { fill: var(--accent); } .v-next { stroke: var(--muted); stroke-dasharray: 5 5; stroke-width: 2; } .v-bracket { stroke: var(--muted); stroke-width: 1.5; }
.v-ctl { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: center; margin-top: 10px; font-size: .92rem; }
.v-ctl input { width: 100%; accent-color: var(--accent); }
.v-val { font-family: var(--num); font-variant-numeric: tabular-nums; min-width: 7ch; text-align: right; }
.v-read { margin: 8px 0 0; font-size: .95rem; }
.v-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: .82rem; color: var(--muted); margin-top: 8px; }
.v-legend span { display: inline-flex; align-items: center; gap: 6px; }
.v-sw { display: inline-block; width: 14px; height: 10px; border-radius: 2px; }
.v-sw.v-line-sw { background: var(--fg); height: 3px; } .v-sw.v-dash-sw { background: var(--bad); height: 3px; }
.v-sw.v-water { background: var(--water); } .v-sw.v-solid { background: var(--solid); } .v-sw.v-vapor { background: var(--vapor); }
.v-sw.v-o2 { background: var(--o2); } .v-sw.v-n2 { background: var(--n2); } .v-sw.v-co2 { background: var(--co2); }
.v-sw.v-sens { background: var(--sens); } .v-sw.v-lat { background: var(--lat); } .v-sw.v-feed { background: var(--accent); } .v-sw.v-loop { background: var(--salt); }
.v-sw.v-salt { background: var(--salt); } .v-sw.v-stroke-sens-sw { background: var(--sens); height: 3px; } .v-sw.v-stroke-lat-sw { background: var(--lat); height: 3px; }
@media (max-width: 560px) { .v-ctl { grid-template-columns: minmax(0, 1fr) auto; } .v-ctl input { grid-column: 1 / -1; grid-row: 2; } }

/* reference search, and the exam formats (core/items.js) */
.ref-search { font: inherit; width: 100%; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--fg); margin: 4px 0 8px; }
.ref-lesson { color: var(--accent); }
.fill { display: flex; gap: 8px; align-items: center; }
.fill input { font: inherit; font-family: var(--num); width: 12ch; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--fg); }
.fill .unit { font-family: var(--num); }
ol.order { list-style: none; padding-left: 0; margin: 0; display: grid; gap: 6px; counter-reset: st; }
ol.order li::before { counter-increment: st; content: counter(st) "."; flex: none; min-width: 1.4em; color: var(--muted); font-variant-numeric: tabular-nums; }   /* a flex item shows no list marker, so the number is drawn */
ol.order .txt { flex: 1; min-width: 0; }
ol.order li { display: flex; gap: 10px; align-items: center; justify-content: space-between; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; background: var(--card); cursor: grab; }
ol.order li.drag { opacity: .5; }
ol.order .btns { display: flex; gap: 4px; flex: none; }
.mv { font: inherit; width: 32px; height: 32px; border: 1px solid var(--line); border-radius: 6px; background: var(--soft); color: var(--fg); cursor: pointer; }
.mv:disabled { opacity: .35; cursor: default; }
svg.hot { width: 100%; min-width: 560px; height: auto; display: block; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
.hs { cursor: pointer; outline: none; }
.hs-hit { stroke: transparent; stroke-width: 22; }
.hs-line { stroke: var(--muted); stroke-width: 4; }
.hs:hover .hs-line, .hs:focus .hs-line { stroke: var(--accent); }
.hs.on .hs-line { stroke: var(--accent); stroke-width: 7; }
.hs.on text { font-weight: 700; fill: var(--accent); }
.hs-unit:hover .v-vessel, .hs-unit:focus .v-vessel { stroke: var(--accent); }
.hs-unit.on .v-vessel { stroke: var(--accent); stroke-width: 4; }

/* the test screen (test.html) */
.btn.sm { padding: 6px 12px; font-size: .88rem; }
.totals { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin: 8px 0 16px; }
.totals div { background: var(--soft); border-radius: 10px; padding: 12px 14px; }
.totals b { display: block; font: 600 1.3rem/1.2 var(--num); font-variant-numeric: tabular-nums; }
.totals span { color: var(--muted); font-size: .9rem; }
.test-opts h3 { margin-top: 14px; }
.choice b { display: block; }
.tests { display: grid; gap: 10px; }
.test-card { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.test-card > div:first-child { display: grid; gap: 2px; min-width: 0; }
.test-card .row { margin-top: 0; }
.exam-bar { position: sticky; top: 0; z-index: 5; display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; justify-content: space-between; background: var(--bg); border-bottom: 1px solid var(--line); padding: 10px 0; margin-bottom: 8px; }
.eb-left { display: grid; gap: 0; } .eb-right { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.eb-timer { font: 600 1rem var(--num); font-variant-numeric: tabular-nums; padding: 4px 10px; border-radius: 6px; background: var(--soft); }
.eb-timer.low { background: var(--bad-soft); color: var(--bad); }
.qgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(46px, 1fr)); gap: 6px; margin: 10px 0; }
.qcell { font: 600 .9rem var(--num); height: 40px; border: 1px solid var(--line); border-radius: 6px; background: var(--card); color: var(--fg); cursor: pointer; position: relative; }
.qcell.done { background: var(--soft); border-color: var(--accent); }
.qcell.flag::after { content: '⚑'; position: absolute; top: 1px; right: 4px; font-size: .7rem; color: var(--bad); }
.ref-panel { position: fixed; top: 0; right: 0; bottom: 0; width: min(460px, 100vw); overflow-y: auto; background: var(--bg); border-left: 1px solid var(--line); box-shadow: -8px 0 24px rgba(0,0,0,.12); padding: 14px 16px; z-index: 20; }
.ref-panel .row { justify-content: space-between; }
.ref-panel .ref h2 { font-size: 1.05rem; } .ref-panel .ref-doc h3 { font-size: .95rem; }
.qresult { border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; margin: 6px 0; background: var(--card); }
.qresult summary { color: var(--fg); font-weight: 500; display: flex; gap: 10px; }
.qresult .mark { font-weight: 700; } .qresult.ok .mark { color: var(--good); } .qresult.no .mark { color: var(--bad); }
.qresult .stem { margin-top: 8px; }

/* landing and progress pages */
.lede-big { font-size: 1.12rem; max-width: 62ch; }
a.btn { display: inline-block; text-decoration: none; }
.how { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 8px 0 20px; }
.how > div { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.how p { margin: 4px 0 0; font-size: .92rem; color: var(--muted); }
.topic-link { box-sizing: border-box; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 4px 14px; width: 100%; padding: 12px 16px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; color: var(--fg); text-decoration: none; }
a.topic-link:hover { border-color: var(--accent); }
.topic-link.off { opacity: .6; }
.topic-link .n { font-family: var(--num); color: var(--accent); font-weight: 600; } .topic-link .t { font-weight: 600; }
.topic-link .m { color: var(--muted); font-size: .88rem; text-align: right; white-space: nowrap; }
.topic-link .d { grid-column: 2 / -1; color: var(--muted); font-size: .9rem; }
svg.trend { width: 100%; min-width: 0; height: auto; display: block; }   /* not the 560 px floor of a lesson picture: the trend fits a phone */
.prog td { white-space: nowrap; } .sym.prog td:first-child { white-space: normal; font-family: var(--body); }
.state-passed { color: var(--good); font-weight: 600; } .state-refresh { color: var(--bad); font-weight: 600; } .state-none { color: var(--muted); }
@media (max-width: 560px) { .topic-link { grid-template-columns: auto minmax(0, 1fr); } .topic-link .m { grid-column: 2; text-align: left; } }

/* the doors on the landing page */
.doors { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 14px; }
.doors a { font-size: .9rem; text-decoration: none; color: var(--fg); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; }
.doors a.on { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }

/* flag this question (core/feedback.js) */
.flag { margin-top: 10px; }
.flag-link { all: unset; cursor: pointer; font-size: .85rem; color: var(--muted); }
.flag-link:hover, .flag-link:focus-visible { color: var(--bad); text-decoration: underline; }
.flag-form { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin-top: 6px; display: grid; gap: 8px; background: var(--soft); }
.flag-kinds { display: grid; gap: 4px; font-size: .9rem; }
.flag-form textarea, .flag-dump { font: inherit; font-size: .9rem; width: 100%; border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; background: var(--card); color: var(--fg); }

[hidden] { display: none !important; }
/* a procedure order, revealed: each rule broken, with its reason */
ul.broken { margin: 4px 0 0; padding-left: 1.2em; display: grid; gap: 8px; }
ul.broken .pair { display: block; font-weight: 600; }
ul.broken .why { display: block; font-size: .92rem; color: var(--muted); }
ol.order.locked li { cursor: default; }

/* the top bar on every page (core/nav.js); hidden inside a running test, where the test's own bar stands */
.topnav { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--line); }
.tn-in { max-width: 860px; margin: 0 auto; padding: 8px 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px 20px; }
.tn-brand { font-weight: 700; color: var(--fg); text-decoration: none; font-size: .98rem; }
.tn-brand:hover { color: var(--accent); }
.tn-links { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.tn-links a { color: var(--muted); text-decoration: none; font-size: .93rem; padding: 4px 0; border-bottom: 2px solid transparent; }
.tn-links a:hover { color: var(--fg); }
.tn-links a[aria-current="page"] { color: var(--fg); border-bottom-color: var(--accent); }
.tn-units { margin-left: auto; flex-wrap: nowrap; }
.tn-account:empty { display: none; }
.tn-account { display: flex; align-items: center; gap: 8px; min-width: 0; font-size: .9rem; }
.tn-account a { color: var(--link); font-weight: 600; text-decoration: none; white-space: nowrap; }
.tn-account a:hover { text-decoration: underline; }
.tn-who { color: var(--muted); max-width: 24ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tn-who.tn-off { color: var(--warn); }
.tn-out { font: inherit; font-size: .86rem; background: transparent; color: var(--fg); border: 1px solid var(--line); border-radius: 6px; padding: 3px 9px; cursor: pointer; white-space: nowrap; }
.tn-out:hover { border-color: var(--accent); }
body.in-exam .topnav { display: none; }
@media (max-width: 640px) {
  .tn-in { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; grid-template-areas: "brand units acct" "links links links"; gap: 4px 10px; padding: 6px 16px; }
  .tn-brand { grid-area: brand; } .tn-links { grid-area: links; gap: 2px 16px; } .tn-units { grid-area: units; } .tn-account { grid-area: acct; align-self: center; }
  .tn-ulabel { display: none; }
  .tn-units button { padding: 3px 8px; }
  /* "Sign in" ends the links' row; signed in, the address and "Sign out" take a row of their own under the links */
  .tn-in:has(#nav-signin) { grid-template-areas: "brand units" "links links"; grid-template-columns: minmax(0, 1fr) auto; }
  .tn-in:has(#nav-signin) .tn-links { padding-right: 62px; }
  .tn-in:has(#nav-signin) .tn-account { grid-area: 2 / 2 / 3 / 3; justify-self: end; align-self: start; padding-top: 4px; }
  .tn-in:has(.tn-who) { grid-template-areas: "brand units" "links links" "acct acct"; grid-template-columns: minmax(0, 1fr) auto; }
  .tn-in:has(.tn-who) .tn-account { justify-content: flex-end; }
}
/* the browser keeps nothing (Progress.canStore) */
.store-warn { background: var(--bad-soft); color: var(--fg); border-left: 4px solid var(--bad); border-radius: 0 8px 8px 0; padding: 10px 14px; margin: 0 0 16px; font-weight: 600; max-width: 68ch; }

/* the discipline page (index.html) */
.disc { border-top: 1px solid var(--line); padding: 18px 0 6px; }
.disc h3 { margin: 0 0 10px; font-size: 1.2rem; }
.doors3 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.door { display: grid; gap: 4px; align-content: start; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; color: var(--fg); text-decoration: none; }
a.door:hover { border-color: var(--accent); }
.door b { font-size: 1.1rem; }
.door .muted { font-size: .92rem; }
.door .price { font-size: .88rem; font-weight: 600; color: var(--good); }
.door .go { color: var(--link); font-weight: 600; font-size: .95rem; margin-top: 4px; }
.door.big { grid-column: 1 / -1; border: 2px solid var(--accent); padding: 20px 22px; }
.door.big b { font-size: 1.3rem; }
.door .tag { justify-self: start; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; color: var(--accent-fg); background: var(--accent); border-radius: 999px; padding: 2px 10px; }
.disc.later { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 16px; padding: 12px 0; color: var(--muted); }
.disc.later h3 { margin: 0; font-size: 1.05rem; color: var(--muted); }
@media (max-width: 560px) { .doors3 { grid-template-columns: minmax(0, 1fr); } }

/* lesson to lesson, at the foot of a lesson (topic.html) */
.lesson-nav { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; margin-top: 28px; padding-top: 16px; border-top: 1px solid var(--line); }
.lesson-nav button { font: inherit; text-align: left; display: grid; gap: 2px; background: var(--card); color: var(--fg); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; cursor: pointer; min-width: 0; }
.lesson-nav button:hover { border-color: var(--accent); }
.lesson-nav .next { grid-column: 2; text-align: right; }
.lesson-nav small { color: var(--muted); font-size: .8rem; }
.lesson-nav span { font-weight: 600; overflow-wrap: anywhere; }
.h-note { font-size: .85rem; font-weight: 400; }
.bad-text { color: var(--bad); font-weight: 600; }
html { scroll-padding-top: 96px; }   /* an anchor or scrollIntoView lands below the sticky top bar */

/* the diagnostic and the study plan (MANAGER.md 14): verdict tags, the plan's days, the outline's Today */
:root { --warn: #8a5a00; --warn-soft: #fbf0d9; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --warn: #e5b85c; --warn-soft: #33280f; } }
:root[data-theme="dark"] { --warn: #e5b85c; --warn-soft: #33280f; }
.vt { display: inline-block; font-size: .76rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; padding: 1px 8px; border-radius: 999px; white-space: nowrap; font-family: var(--body); }
.vt-weak { color: var(--bad); background: var(--bad-soft); } .vt-fair { color: var(--warn); background: var(--warn-soft); } .vt-ready { color: var(--good); background: var(--good-soft); }
.plan-form { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin: 8px 0 12px; }
.plan-form label { display: flex; gap: 8px; align-items: center; font-weight: 600; }
.plan-form input[type="date"] { font: inherit; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--card); color: var(--fg); }
.plan-week { margin: 10px 0; }
.plan-week > summary { padding: 6px 0; }
.plan-week > summary .muted { font-weight: 400; }
.plan-days { list-style: none; padding: 0; margin: 6px 0 0; display: grid; gap: 8px; }
.plan-day { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; }
.plan-day.is-today { border: 2px solid var(--accent); }
.plan-day.k-full { border-left: 4px solid var(--accent); }
.plan-day.k-light, .plan-day.k-exam { background: var(--soft); }
.pd-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 12px; font-weight: 600; }
.pd-min { color: var(--muted); font-weight: 400; font-size: .9rem; }
.pd-items { margin: 4px 0 0; padding-left: 1.2em; }
.pd-items li { margin: 3px 0; overflow-wrap: anywhere; }
.pi-min { color: var(--muted); font-size: .88rem; white-space: nowrap; }
.today-box { border: 2px solid var(--accent); background: var(--card); border-radius: 12px; padding: 14px 16px; margin: 0 0 22px; }
.today-box h2 { margin: 0 0 2px; font-size: 1.15rem; }
.today-box .row { margin-top: 10px; }
.copy-dump { margin-top: 8px; }
/* the daily e-mail prompts switch on the progress page (STEP2.md B4) */
.prompts { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; margin: 12px 0 4px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); }
.prompts p { margin: 0; }
.switch { display: inline-flex; gap: 10px; align-items: center; font-weight: 600; cursor: pointer; }
.switch input { appearance: none; -webkit-appearance: none; position: relative; width: 42px; height: 24px; margin: 0; border-radius: 999px; background: var(--line); cursor: pointer; flex: none; transition: background .15s; }
.switch input::after { content: ''; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%; background: var(--card); box-shadow: 0 1px 2px rgba(0,0,0,.3); transition: left .15s; }
.switch input:checked { background: var(--accent); }
.switch input:checked::after { left: 21px; }
.switch input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.prompts-note { color: var(--muted); font-size: .92rem; overflow-wrap: anywhere; }
.test-card.is-picked { border-color: var(--accent); border-width: 2px; }
.sym.by-area td:first-child { font-family: var(--body); white-space: normal; }

/* the sign-in page (signin.html) */
.signin #box { max-width: 34rem; }
.signin h1 { overflow-wrap: anywhere; }
.signin-form { margin: 14px 0 6px; }
.signin-form label { display: block; font-weight: 600; margin-bottom: 6px; }
.signin-row { display: flex; flex-wrap: wrap; gap: 8px 10px; }
.signin-row input[type="email"] { font: inherit; flex: 1 1 14rem; min-width: 0; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--fg); }
.signin-row input[type="email"]:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.signin .small { font-size: .88rem; }

/* the owner's view (owner.html, STEP2.md B3) */
.owner-only { font-size: 1.05rem; margin-top: 18px; }
.ow-list { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; margin-top: 12px; }
.ow-tester { min-width: 0; border: 1px solid var(--line); border-radius: 10px; background: var(--card); padding: 0 14px; }
.ow-tester[open] { padding-bottom: 12px; }
.ow-tester > summary { cursor: pointer; padding: 11px 0; display: flex; flex-wrap: wrap; gap: 2px 10px; align-items: baseline; }
.ow-name { font-weight: 700; overflow-wrap: anywhere; }
.ow-meta { font-size: .88rem; }
.ow-product { border-top: 1px solid var(--line); margin-top: 10px; padding-top: 6px; }
.ow-product h4, .ow-tester > h4 { margin: 8px 0 4px; font-size: 1rem; }
.ow-tester > h4 { border-top: 1px solid var(--line); padding-top: 12px; margin-top: 14px; }
.ow-result h5, .ow-product h5 { margin: 12px 0 2px; font-size: .92rem; }
.ow-result p, .ow-date { margin: 2px 0; }
.ow-all summary { cursor: pointer; color: var(--link); font-size: .9rem; margin-top: 8px; }
.ow-flag { border-left: 4px solid var(--warn); background: var(--soft); border-radius: 0 8px 8px 0; padding: 8px 12px; margin: 10px 0; }
.ow-flag-head { margin: 0 0 4px; overflow-wrap: anywhere; font-size: .92rem; }
.ow-note { margin: 4px 0 8px; padding: 6px 10px; border-left: 2px solid var(--line); background: var(--card); white-space: pre-wrap; overflow-wrap: anywhere; }
.ow-choices .choice { cursor: default; }
.ow-match { font-size: .86rem; color: var(--good); margin: 6px 0; }
.ow-match.bad { color: var(--bad); }
.ow-kv { font-size: .92rem; }
.ow-item > p.muted { display: none; }   /* "drag the steps": nothing to do here */