/* CS2040C course: plain white paper, black ink, one linear path. Fonts and accent colours match the rest of Lumina. */
:root {
  color-scheme: light;
  --paper: #ffffff;
  --ink: #111418;
  --muted: #5d6573;
  --faint: #8b929e;
  --line: #d9dce1;
  --line-2: #eceef1;
  --tint: #f5f6f8;
  --accent: #3457d5;
  --accent-soft: rgba(52, 87, 213, .09);
  --hot: #d0461b;
  --hot-soft: rgba(208, 70, 27, .1);
  --good: #1d7f52;
  --good-soft: rgba(29, 127, 82, .09);
  --gold: #a87a0c;
  --gold-soft: rgba(168, 122, 12, .12);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--paper); }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16.5px/1.62 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; letter-spacing: -.005em; }
h1 { font-size: clamp(28px, 5vw, 38px); margin: 4px 0 8px; }
h2 { font-size: clamp(21px, 3.2vw, 25px); margin: 0 0 8px; }
h3 { font-size: 18px; margin: 0 0 6px; }
p { margin: 0 0 10px; overflow-wrap: break-word; }
ul, ol { margin: 4px 0 10px; padding-left: 1.3em; }
li { margin: 2px 0; }
b, strong { font-weight: 600; }
code, kbd { font-family: var(--mono); font-size: .86em; background: var(--tint); border: 1px solid var(--line-2); padding: 0 4px; border-radius: 3px; }
pre.code { font: 13.5px/1.55 var(--mono); background: var(--tint); border: 1px solid var(--line-2); border-left: 2px solid var(--ink); padding: 10px 12px; margin: 8px 0 12px; overflow-x: auto; white-space: pre; tab-size: 4; }
pre.code .k { color: #1b3fb0; } pre.code .c { color: #7a808b; font-style: italic; } pre.code .s { color: #8a4a0a; } pre.code .hl { background: #fff2b8; display: inline-block; min-width: 100%; }
.muted { color: var(--muted); } .small { font-size: 14px; } .tiny { font-size: 12.5px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
sub, sup { font-size: .72em; }
.nowrap { white-space: nowrap; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 30; background: rgba(255,255,255,.94); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar .in { max-width: 880px; margin: 0 auto; padding: 0 16px; height: 52px; display: flex; align-items: center; gap: 14px; }
.brand { font-family: var(--serif); font-weight: 700; font-size: 19px; color: var(--ink); text-decoration: none; }
.brand span { color: var(--accent); }
.topbar nav { margin-left: auto; display: flex; gap: 16px; font-size: 14px; align-items: center; white-space: nowrap; }
.topbar nav a { color: var(--muted); text-decoration: none; }
.topbar nav a:hover { color: var(--ink); }
#acct { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px; color: var(--muted); }
#acct .why, #acct .err { display: none; }
#acct button { font: inherit; font-size: 13px; color: var(--ink); background: #fff; border: 1px solid #bbb; border-radius: 3px; padding: 3px 8px; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; }
#acct svg { width: 14px; height: 14px; }
@media (max-width: 560px) { #acct .who { display: none; } .topbar nav { gap: 11px; } .topbar nav .navopt { display: none; } }

.page { max-width: 880px; margin: 0 auto; padding: 22px 16px 80px; }
.kicker { font-size: 13.5px; color: var(--muted); }
.lead { font-size: 18px; color: var(--ink); max-width: 46em; }
.foot { margin-top: 50px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--faint); font-size: 13px; }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; font: 600 14.5px/1.2 var(--sans); padding: 8px 15px; border-radius: 3px; border: 1px solid var(--ink); background: var(--ink); color: #fff; cursor: pointer; text-decoration: none; }
.btn:hover { background: #2a2f37; }
.btn.ghost { background: #fff; color: var(--ink); border-color: #b9bec6; font-weight: 500; }
.btn.ghost:hover { border-color: var(--ink); }
.btn.small { padding: 5px 10px; font-size: 13.5px; }
.btn[disabled] { opacity: .45; cursor: default; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--accent); font: inherit; cursor: pointer; text-decoration: underline; text-underline-offset: 2px; }

/* overview */
.howto { padding-left: 1.3em; margin: 14px 0 18px; }
.howto li { margin: 4px 0; }
.exammap { width: 100%; border-collapse: collapse; font-size: 14.5px; margin: 10px 0 18px; }
.exammap td, .exammap th { border-bottom: 1px solid var(--line-2); padding: 6px 8px 6px 0; text-align: left; vertical-align: top; }
.exammap th { font-weight: 600; color: var(--muted); font-size: 13px; }
.chapter { border-top: 1.5px solid var(--ink); padding: 14px 0 4px; margin: 26px 0 10px; }
.chapter header { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.chapter header .num { color: var(--muted); font-size: 13.5px; }
.chapter header .exams { margin-left: auto; color: var(--muted); font-size: 13px; }
.chapter .q { color: var(--muted); margin: 2px 0 8px; }
.secs { list-style: none; padding: 0; margin: 4px 0 0; }
.secs li { display: grid; grid-template-columns: 3.1em 1fr auto; gap: 2px 10px; padding: 7px 0; border-bottom: 1px solid var(--line-2); align-items: baseline; }
.secs .id { font-family: var(--mono); font-size: 13.5px; color: var(--muted); }
.secs a { color: var(--ink); text-decoration: none; font-weight: 500; }
.secs a:hover { color: var(--accent); }
.secs .h { display: block; color: var(--muted); font-size: 14px; }
.secs .st { color: var(--faint); font-size: 13px; white-space: nowrap; }
.secs .st.done { color: var(--good); }
.secs .st.part { color: var(--ink); }

/* section page */
.shead { margin-bottom: 8px; }
.shead .crumb { font-size: 13.5px; color: var(--muted); }
.shead .crumb a { color: var(--muted); }
.shead .hook { font-size: 18px; color: var(--ink); margin-top: 4px; }
.part-title { font-family: var(--serif); font-size: 15px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin: 34px 0 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.step { position: relative; padding: 2px 0 14px 34px; animation: rise .3s ease; }
.step .sn { position: absolute; left: 0; top: 2px; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--ink); font: 600 12px/20px var(--sans); text-align: center; color: var(--ink); background: #fff; }
.step.cur .sn { background: var(--ink); color: #fff; }
.step > .body > *:last-child { margin-bottom: 0; }
.step .body { min-width: 0; }
@keyframes rise { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.note { border-left: 2px solid var(--accent); padding: 4px 0 4px 12px; margin: 8px 0 12px; }
.note.warn { border-left-color: var(--hot); }
.note.key { border-left-color: var(--ink); background: var(--tint); padding: 8px 12px; }
.def { border: 1px solid var(--line); padding: 8px 12px; margin: 8px 0 12px; }
.def b:first-child { font-family: var(--serif); }
table.t { border-collapse: collapse; font-size: 14.5px; margin: 8px 0 12px; min-width: 50%; }
table.t th, table.t td { border: 1px solid var(--line); padding: 5px 9px; text-align: left; vertical-align: top; }
table.t th { background: var(--tint); font-weight: 600; }
table.t td.c, table.t th.c { text-align: center; }
.tw { overflow-x: auto; max-width: 100%; }
.next-row { margin-top: 10px; }

/* questions */
.q { margin: 8px 0 4px; }
.q .prompt { margin-bottom: 8px; }
.opts { display: flex; flex-direction: column; gap: 6px; margin: 6px 0; }
.opts.inline { flex-direction: row; flex-wrap: wrap; }
.opt { display: flex; gap: 9px; align-items: flex-start; text-align: left; font: inherit; font-size: 15.5px; color: var(--ink); background: #fff; border: 1px solid #c9cdd3; border-radius: 3px; padding: 7px 11px; cursor: pointer; }
.opt:hover:not([disabled]) { border-color: var(--ink); }
.opt .mk { flex: none; font: 600 12.5px/1.6 var(--mono); color: var(--muted); min-width: 1.2em; }
.opt.sel { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.opt.right { border-color: var(--good); background: var(--good-soft); }
.opt.wrong { border-color: var(--hot); background: var(--hot-soft); }
.opt[disabled] { cursor: default; }
.opt code { white-space: nowrap; }
.tfrow { display: grid; grid-template-columns: 1fr auto; gap: 8px 12px; align-items: center; padding: 7px 0; border-bottom: 1px solid var(--line-2); }
.tfrow .tfb { display: flex; gap: 4px; }
.tfrow .tfb button { font: 600 13.5px var(--sans); width: 38px; padding: 5px 0; border: 1px solid #c9cdd3; background: #fff; border-radius: 3px; cursor: pointer; color: var(--ink); }
.tfrow .tfb button.sel { background: var(--ink); color: #fff; border-color: var(--ink); }
.tfrow .tfb button.right { background: var(--good); border-color: var(--good); color: #fff; }
.tfrow .tfb button.wrong { background: var(--hot); border-color: var(--hot); color: #fff; }
.tfrow .why { grid-column: 1 / -1; font-size: 14.5px; color: var(--muted); }
input.ans, select.ans { font: 15px var(--mono); padding: 6px 9px; border: 1px solid #b9bec6; border-radius: 3px; background: #fff; color: var(--ink); min-width: 0; }
input.ans:focus, select.ans:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
input.ans.wide { width: 100%; max-width: 520px; }
input.ans.num { width: 7em; text-align: center; }
.slots { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 6px; margin: 6px 0; max-width: 640px; }
.slots label { display: flex; flex-direction: column; font-size: 12px; color: var(--muted); font-family: var(--mono); }
.slots input { width: 100%; }
.fmt { font-size: 13px; color: var(--muted); margin-top: 3px; }
.fb { margin-top: 10px; padding: 8px 12px; border-left: 3px solid var(--line); background: var(--tint); }
.fb.good { border-left-color: var(--good); }
.fb.bad { border-left-color: var(--hot); }
.fb .verdict { font-weight: 600; margin-bottom: 4px; }
.fb.good .verdict { color: var(--good); } .fb.bad .verdict { color: var(--hot); }
.fb > *:last-child { margin-bottom: 0; }

/* exam points */
.points { border: 1px solid var(--ink); padding: 12px 16px 6px; margin: 14px 0; }
.points h3 { font-size: 16px; margin-bottom: 4px; }
.points ul { padding-left: 1.2em; }
.points li { margin: 5px 0; font-size: 15.5px; }

/* problems */
.ladder { display: flex; gap: 6px 14px; flex-wrap: wrap; font-size: 14.5px; color: var(--muted); margin: 6px 0 12px; }
.ladder span.on { color: var(--ink); font-weight: 600; }
.ladder span.done { color: var(--good); }
.pcard { border-top: 1px solid var(--line); padding-top: 12px; }
.pcard .ptag { font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.won { padding: 10px 14px; border: 1px solid var(--good); color: var(--ink); margin: 10px 0; }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 40px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 15px; }
.pager a { text-decoration: none; }
.pager .r { text-align: right; margin-left: auto; }
.pager small { display: block; color: var(--muted); font-size: 12.5px; }

/* visualisations */
.viz { border: 1px solid var(--line); margin: 10px 0 14px; background: #fff; }
.viz .vbar { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; padding: 8px 10px; border-bottom: 1px solid var(--line-2); background: var(--tint); font-size: 14px; }
.viz .vbar label { display: inline-flex; gap: 5px; align-items: center; color: var(--muted); }
.viz .vbar input, .viz .vbar select { font: 13.5px var(--mono); padding: 4px 7px; border: 1px solid #b9bec6; border-radius: 3px; background: #fff; color: var(--ink); min-width: 0; }
.viz .vbar input.w { width: 14em; max-width: 100%; }
.viz .vbar input.s { width: 4.5em; }
.viz .vbar button { font: 500 13.5px var(--sans); padding: 4px 10px; border: 1px solid #b9bec6; border-radius: 3px; background: #fff; color: var(--ink); cursor: pointer; }
.viz .vbar button:hover { border-color: var(--ink); }
.viz .vbar button.pri { background: var(--ink); color: #fff; border-color: var(--ink); }
.viz .vbar .sp { flex: 1; }
.viz .stage { padding: 10px; overflow-x: auto; }
.viz .stage svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.viz .cap { padding: 8px 12px; border-top: 1px solid var(--line-2); font-size: 15px; min-height: 2.6em; }
.viz .cap b { font-weight: 600; }
.viz .player { display: flex; align-items: center; gap: 6px; padding: 6px 10px; border-top: 1px solid var(--line-2); font-size: 13px; color: var(--muted); }
.viz .player button { font: 600 14px var(--sans); min-width: 34px; height: 30px; border: 1px solid #b9bec6; background: #fff; border-radius: 3px; cursor: pointer; color: var(--ink); }
.viz .player button:hover { border-color: var(--ink); }
.viz .player input[type=range] { flex: 1; min-width: 60px; accent-color: var(--ink); }
.viz .side { display: flex; flex-wrap: wrap; gap: 10px 22px; padding: 0 12px 10px; font-size: 13.5px; }
.viz .side .box { min-width: 0; }
.viz .side .lbl { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.viz .side .val { font-family: var(--mono); font-size: 14px; }
.viz .err { color: var(--hot); font-size: 13.5px; padding: 0 12px 8px; }
.viz table.pq { border-collapse: collapse; font: 13px var(--mono); }
.viz table.pq td, .viz table.pq th { border: 1px solid var(--line); padding: 2px 7px; text-align: center; }
.viz table.pq th { background: var(--tint); font-weight: 600; font-family: var(--sans); }
.viz table.pq tr.top td { background: var(--gold-soft); }
.viz table.pq td.done { color: var(--faint); }
/* svg element styles */
svg text { font-family: var(--sans); }
svg .mono { font-family: var(--mono); }
.figure { margin: 8px 0 12px; text-align: center; }
.figure svg { max-width: 100%; height: auto; }
.figure .fc { font-size: 13.5px; color: var(--muted); margin-top: 4px; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .step { padding-left: 28px; }
  .secs li { grid-template-columns: 2.8em 1fr; }
  .secs .st { grid-column: 2; }
  .viz .vbar input.w { width: 100%; }
}
.chapter.practice { background: var(--tint, #f5f6f8); border-top: 3px solid var(--ink); padding: 14px 14px 6px; }
.chapter.practice header .num { color: var(--ink); font-weight: 600; }

/* problem-first steps, tags, memory pictures, scenes */
.stag { display: inline-block; font: 700 11.5px/1 var(--sans, system-ui); letter-spacing: .06em; text-transform: uppercase; color: #6d28d9; background: #ede9fe; border-radius: 999px; padding: 5px 10px; margin: 0 0 10px; }
.step.prob { background: linear-gradient(135deg, #fff7ed, #fffbeb); border-color: #fcd9a8; }
.step.prob .stag { color: #b45309; background: #fde7c7; }
.step .q.go { margin-top: 6px; }
.memwrap { display: flex; flex-wrap: wrap; gap: 14px 22px; align-items: flex-start; justify-content: center; }
.memwrap .memcode { flex: 0 1 300px; min-width: 0; }
.memwrap .memcode pre.code { margin: 0; font-size: 13px; }
.memwrap .memfig svg { display: block; max-width: 100%; height: auto; }
.scene { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 14px; margin: 8px 0 4px; }
.scene .si { text-align: center; min-width: 70px; max-width: 140px; }
.scene .ic { font-size: 38px; line-height: 1.1; }
.scene .lb { font-size: 13px; color: var(--muted, #5d6573); margin-top: 4px; }
.scene .arr { font-size: 20px; color: #a0a6b3; }

/* prerequisite FAQ boxes */
.faqs { margin: 12px 0 4px; display: grid; gap: 8px; }
.faq { border: 1.5px solid #f2c14e; background: #fffaf0; border-radius: 10px; }
.faq > summary { cursor: pointer; padding: 9px 12px; font-weight: 600; list-style: none; }
.faq > summary::-webkit-details-marker { display: none; }
.faq > summary::before { content: "▸ "; color: #b7791f; }
.faq[open] > summary::before { content: "▾ "; }
.faqk { display: inline-block; background: #f2c14e; color: #5a3e00; font-size: 11px; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; padding: 2px 7px; border-radius: 999px; margin-right: 6px; }
.faqb { padding: 2px 14px 12px; }
.faqb p { margin: 6px 0; }
/* worked examples before problems */
.worked { border: 1.5px solid #7c9cf5; background: #f5f8ff; border-radius: 12px; margin: 10px 0 12px; }
.worked > summary { cursor: pointer; padding: 10px 14px; font-weight: 600; list-style: none; }
.worked > summary::-webkit-details-marker { display: none; }
.wk { display: inline-block; background: #4f6fe0; color: #fff; font-size: 11px; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; padding: 2px 8px; border-radius: 999px; margin-right: 6px; }
.wbody { padding: 0 14px 12px; }
.wbody .opt { cursor: default; }

/* mistake book */
.topbar nav a.mblink { display: inline-flex; align-items: center; gap: 5px; }
.mbn { display: inline-block; min-width: 18px; padding: 0 5px; border-radius: 9px; background: #e5484d; color: #fff; font-size: 11.5px; line-height: 18px; text-align: center; font-weight: 700; }
.mbcard { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin: 14px 0; }
.mbcard.cleared { opacity: .6; }
.mbcard .ptag a { color: inherit; }
.mbnote { margin-top: 8px; }

/* step-by-step from the server (core.js): a similar question after two misses, the note to AI assistants */
.again { color: var(--accent, #5b4ef0); font-weight: 600; margin: 14px 0 6px; }
.ai-note { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.ai-notice { margin-top: 28px; text-align: center; }

/* coming back to a section (engine.js renderSection) */
.resume { margin: 14px 0 4px; padding: 10px 14px; border-radius: 10px; background: #f3f1ff; border: 1px solid #dcd8f6; color: #2b2950; font-size: 15px; }
.resume .linkbtn { margin-left: 4px; }

/* an answer is on its way to the server: show it at once */
.q.checking { cursor: progress; }
.q.checking .opt.sel, .q.checking .tfb .sel, .q.checking .btn { animation: lu-checking .7s ease-in-out infinite alternate; }
@keyframes lu-checking { from { opacity: 1; } to { opacity: .55; } }

/* the way back (section, mistakes and course home pages) */
.backrow { display: flex; gap: 10px; flex-wrap: wrap; margin: 6px 0 14px; }
.backbtn { display: inline-flex; align-items: center; padding: 8px 14px; border-radius: 999px; font-weight: 600; font-size: 14.5px; text-decoration: none; background: #5b4ef0; color: #fff; }
.backbtn.alt { background: #fff; color: #4a3fd0; border: 1px solid #cfc9f7; }
.backbtn:hover { filter: brightness(1.06); }
.pager + .backrow { margin-top: 22px; justify-content: center; }
/* review and view-only */
.pcard.seen { opacity: .96; }

/* "What each exam covers": one card per exam */
.examcards{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:14px;margin:12px 0 26px}
.examcard{background:#fff;border-radius:16px;padding:18px 22px 14px;box-shadow:0 1px 2px rgba(30,27,75,.05),0 6px 18px rgba(30,27,75,.05);border-top:4px solid #6c5ce7}
.examcard .en{font-weight:700;font-size:1.08rem;margin-bottom:8px;color:#1e1b4b}
.examcard .er{display:grid;grid-template-columns:62px 1fr;gap:12px;padding:8px 0;line-height:1.5;font-size:.95rem;border-top:1px solid #eeecf8}
.examcard .er span{color:#7a7896;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;padding-top:4px}

/* ---------- Rewatch / Review buttons, the Mastered status, review and rewatch pieces ---------- */
.secs .st.acts { display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; white-space: normal; }
.secbtn, .secs a.secbtn { display: inline-flex; align-items: center; justify-content: center; min-height: 32px; padding: 0 14px; border-radius: 10px; font: 600 13.5px/1 var(--sans, system-ui); letter-spacing: .01em; text-decoration: none; cursor: pointer; color: #3f35c4; background: linear-gradient(#fff, #f5f3ff); border: 1px solid #d6d0fa; box-shadow: inset 0 1px 0 rgba(255, 255, 255, .9), 0 1px 2px rgba(40, 30, 120, .08); transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease; }
.secbtn:hover, .secs a.secbtn:hover { color: #3f35c4; transform: translateY(-1px); border-color: #b3aaf5; box-shadow: 0 4px 12px rgba(70, 56, 200, .16); }
.secbtn:active { transform: translateY(0); box-shadow: inset 0 1px 2px rgba(40, 30, 120, .14); }
.secbtn.go, .secs a.secbtn.go { color: #fff; border-color: #4a3fd0; background: linear-gradient(180deg, #7669f6, #5546e6); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .25), 0 2px 6px rgba(70, 56, 200, .28); }
.secbtn.go:hover, .secs a.secbtn.go:hover { color: #fff; box-shadow: inset 0 1px 0 rgba(255, 255, 255, .25), 0 6px 16px rgba(70, 56, 200, .34); }
.secbtn:focus-visible { outline: 2px solid #5b4ef0; outline-offset: 2px; }
.mastered { display: inline-flex; align-items: center; gap: 7px; font: 700 12px/1 var(--sans, system-ui); letter-spacing: .09em; text-transform: uppercase; color: #8a5a00; white-space: nowrap; }
.mastered i { font-style: normal; display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; font-size: 11px; color: #fff; background: radial-gradient(circle at 30% 30%, #ffd76a, #e89c0c); box-shadow: 0 0 0 3px rgba(240, 170, 20, .16); }
.mastered.big { font-size: 13px; margin-right: 8px; vertical-align: middle; }
.mastered.big i { width: 24px; height: 24px; font-size: 13px; }
.resume.is-mastered { background: #fffaeb; border-color: #f3dfa6; }
.resume .secbtn { margin: 0 6px 0 2px; vertical-align: middle; }
.teachback { margin: 12px 0; padding: 12px 14px; border-radius: 12px; background: #f7f6ff; border: 1px solid #dcd8f6; }
.teachback .tbk { font: 700 11.5px/1 var(--sans, system-ui); letter-spacing: .06em; text-transform: uppercase; color: #5b4ef0; margin-bottom: 8px; }
.bankn { margin: 16px 0 2px; font: 700 11.5px/1 var(--sans, system-ui); letter-spacing: .06em; text-transform: uppercase; color: #7a7896; }
.bankn b { margin-left: 6px; padding: 2px 7px; border-radius: 999px; color: #fff; background: #5b4ef0; letter-spacing: .04em; }
@media (max-width: 560px) { .secs .st.acts { justify-content: flex-start; margin-top: 4px; } }
.ptag .newtag { margin-left: 6px; padding: 2px 7px; border-radius: 999px; color: #fff; background: #5b4ef0; font-size: 11px; letter-spacing: .04em; text-transform: uppercase; }
.secs .plab { color: #7a7896; font-size: 13px; }
.points.recap h3 { margin-bottom: 10px; }
.rexam { margin-top: 8px; background: #fffaeb; border: 1px solid #f3dfa6; border-radius: 12px; padding: 10px 14px; display: grid; grid-template-columns: 154px 1fr; gap: 4px 18px; align-items: start; }
@media (max-width: 640px) { .rexam { grid-template-columns: 1fr; } }
.rexam .rh { color: #8a5a00; }
.points.recap ul { margin: 0; padding-left: 1.1em; }
.points.recap li { margin: 2px 0; font-size: 14.5px; line-height: 1.45; }
.rgroups { margin-bottom: 4px; }
.rgroup { display: grid; grid-template-columns: 168px 1fr; gap: 4px 18px; padding: 9px 0; border-top: 1px solid #eeecf8; align-items: start; }
.rgroup:first-child { border-top: 0; padding-top: 2px; }
.rh { font: 700 11.5px/1.35 var(--sans, system-ui); letter-spacing: .07em; text-transform: uppercase; color: #5b4ef0; padding-top: 4px; }
@media (max-width: 640px) { .rgroup { grid-template-columns: 1fr; } }