/* ═══ TIMED MOCK EXAMS ═══════════════════════════════════════════════════
   One engine, three exams (NPTE / 运动康复师 / IB SEHS). Everything here is
   namespaced under .mk- so it cannot collide with the site skin.
   Colours come from the site's own custom properties, so light and dark are
   free and the skin-coherence check still passes.
   ═══════════════════════════════════════════════════════════════════════ */

/* Also declared on the focus veil, which is appended to <body> rather than to
   the section — without it every var(--mk-*) inside the exam resolves to
   nothing and the option letters lose their circle entirely.

   It MUST be .mk-focus-veil and not html.mk-focus. A var() reference is
   resolved at the element where the declaration sits and the *resolved* value
   then inherits, so declaring this on <html> froze it to the light :root
   value of --surface2 and shadowed the body.dark override underneath: the
   option letter came out light-on-light at 1.14:1 contrast. Both .mk-root and
   .mk-focus-veil are descendants of <body>, so they see the theme's values. */
.mk-root,
.mk-focus-veil {
  --mk-line: var(--border, #d8dde6);
  --mk-soft: var(--surface2, #f2f4f8);
  --mk-dim: var(--text2, #4a5568);
  --mk-ok: #157f4a;
  --mk-no: #b3261e;
  --mk-warn: #8a5a00;
  --mk-key: var(--accent, #b8860b);
}

/* ── launcher card ───────────────────────────────────────────────────── */
.mk-launch {
  border: 1px solid var(--mk-line);
  border-radius: 14px;
  background: var(--surface, #fff);
  padding: 1.15rem 1.25rem 1.25rem;
  margin: 1.4rem 0;
}
.mk-launch h2 {
  margin: 0 0 .3rem;
  font-size: 1.22rem;
  letter-spacing: -.01em;
}
.mk-lede {
  color: var(--mk-dim);
  font-size: .93rem;
  line-height: 1.6;
  margin: 0 0 .95rem;
  max-width: 72ch;
}
.mk-facts {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}
.mk-fact {
  font-size: .78rem;
  line-height: 1.35;
  padding: .3rem .6rem;
  border-radius: 999px;
  background: var(--mk-soft);
  border: 1px solid var(--mk-line);
  color: var(--mk-dim);
}
.mk-fact b {
  color: var(--text, #16233a);
  font-weight: 700;
}
.mk-btns {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.mk-btn {
  font: inherit;
  font-size: .88rem;
  font-weight: 600;
  min-height: 40px;
  padding: .5rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--mk-line);
  background: var(--mk-soft);
  color: var(--text, #16233a);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.mk-btn:hover { border-color: var(--mk-key); }
.mk-btn.primary {
  background: var(--accent, #b8860b);
  border-color: var(--accent, #b8860b);
  color: #fff;
}
.mk-btn.ghost { background: transparent; }
.mk-btn[disabled] { opacity: .5; cursor: default; }

/* ── notices ─────────────────────────────────────────────────────────── */
.mk-note {
  border-radius: 10px;
  padding: .65rem .85rem;
  font-size: .85rem;
  line-height: 1.55;
  margin: .8rem 0;
  border: 1px solid;
}
.mk-note.warn {
  border-color: color-mix(in srgb, var(--mk-warn) 40%, transparent);
  background: color-mix(in srgb, var(--mk-warn) 8%, transparent);
  color: var(--mk-warn);
}
.mk-note.info {
  border-color: color-mix(in srgb, var(--mk-dim) 32%, transparent);
  background: var(--mk-soft);
  color: var(--mk-dim);
}
.mk-note b { color: inherit; }

/* ── exam shell ──────────────────────────────────────────────────────── */
.mk-stage {
  border: 1px solid var(--mk-line);
  border-radius: 14px;
  background: var(--surface, #fff);
  overflow: hidden;
}
.mk-stage[hidden] { display: none; }

.mk-top {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
  padding: .6rem .9rem;
  background: var(--surface, #fff);
  border-bottom: 1px solid var(--mk-line);
}
.mk-name {
  font-weight: 700;
  font-size: .92rem;
  margin-right: auto;
}
.mk-clock {
  font-variant-numeric: tabular-nums;
  font-size: 1.02rem;
  font-weight: 700;
  padding: .22rem .6rem;
  border-radius: 8px;
  background: var(--mk-soft);
  border: 1px solid var(--mk-line);
  min-width: 5.4rem;
  text-align: center;
}
.mk-clock.warn {
  color: var(--mk-warn);
  border-color: color-mix(in srgb, var(--mk-warn) 45%, transparent);
}
.mk-clock.crit {
  color: #fff;
  background: var(--mk-no);
  border-color: var(--mk-no);
}
.mk-sect {
  font-size: .8rem;
  color: var(--mk-dim);
  padding: .2rem .55rem;
  border-radius: 999px;
  border: 1px solid var(--mk-line);
}

/* ── the question ────────────────────────────────────────────────────── */
.mk-body { padding: 1.1rem 1.2rem 1.4rem; }

.mk-scen {
  border: 1px solid var(--mk-line);
  border-left: 3px solid var(--mk-key);
  border-radius: 8px;
  background: var(--mk-soft);
  padding: .7rem .9rem;
  margin-bottom: 1rem;
  font-size: .88rem;
  line-height: 1.6;
}
.mk-scen dl {
  margin: .45rem 0 0;
  display: grid;
  grid-template-columns: minmax(7.5rem, auto) 1fr;
  gap: .16rem .8rem;
}
.mk-scen dt {
  color: var(--mk-dim);
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .02em;
  text-transform: uppercase;
  padding-top: .12rem;
}
.mk-scen dd { margin: 0; }

.mk-qmeta {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  flex-wrap: wrap;
  margin-bottom: .45rem;
  font-size: .8rem;
  color: var(--mk-dim);
}
.mk-qno {
  font-weight: 700;
  color: var(--text, #16233a);
  font-size: .92rem;
}
.mk-tag {
  font-size: .72rem;
  padding: .12rem .45rem;
  border-radius: 999px;
  border: 1px solid var(--mk-line);
  background: var(--mk-soft);
}
.mk-cmd {
  font-size: .72rem;
  padding: .12rem .45rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--mk-key) 45%, transparent);
  color: var(--mk-key);
}
.mk-stem {
  font-size: 1rem;
  line-height: 1.65;
  margin: 0 0 1rem;
  max-width: 78ch;
}

.mk-opts { display: grid; gap: .5rem; }
.mk-opt {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  text-align: left;
  font: inherit;
  font-size: .95rem;
  line-height: 1.55;
  padding: .7rem .85rem;
  min-height: 44px;
  border-radius: 10px;
  border: 1px solid var(--mk-line);
  background: var(--surface, #fff);
  color: var(--text, #16233a);
  cursor: pointer;
}
.mk-opt:hover { border-color: var(--mk-key); }
.mk-opt .k {
  flex: 0 0 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  border: 1px solid var(--mk-line);
  background: var(--mk-soft);
  font-size: .78rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.mk-opt[aria-pressed="true"] {
  border-color: var(--mk-key);
  background: color-mix(in srgb, var(--mk-key) 10%, var(--surface, #fff));
}
.mk-opt[aria-pressed="true"] .k {
  background: var(--mk-key);
  border-color: var(--mk-key);
  color: #fff;
}
.mk-opt.correct {
  border-color: var(--mk-ok);
  background: color-mix(in srgb, var(--mk-ok) 10%, var(--surface, #fff));
}
.mk-opt.correct .k { background: var(--mk-ok); border-color: var(--mk-ok); color: #fff; }
.mk-opt.wrong {
  border-color: var(--mk-no);
  background: color-mix(in srgb, var(--mk-no) 9%, var(--surface, #fff));
}
.mk-opt.wrong .k { background: var(--mk-no); border-color: var(--mk-no); color: #fff; }

/* multi-answer (运动康复师 多项选择) */
.mk-multi-note {
  font-size: .8rem;
  color: var(--mk-warn);
  margin: -.4rem 0 .8rem;
}

/* ── navigator ───────────────────────────────────────────────────────── */
.mk-nav {
  display: grid;
  gap: .5rem;
  margin-top: 1.3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--mk-line);
}
.mk-navrow {
  display: flex;
  gap: .5rem;
  align-items: center;
}
.mk-navrow .mk-btn:first-child { margin-right: auto; }
.mk-dothead {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: .78rem;
  color: var(--mk-dim);
  margin-top: .3rem;
}
.mk-mini {
  font: inherit;
  font-size: .76rem;
  min-height: 40px;
  margin-left: auto;
  padding: .3rem .7rem;
  border-radius: 999px;
  border: 1px solid var(--mk-line);
  background: transparent;
  color: var(--mk-dim);
  cursor: pointer;
}
.mk-mini:hover { color: var(--mk-key); border-color: var(--mk-key); }

/* Bounded box, not eight free rows: on a 225-item paper an unbounded grid
   pushes the question itself off the screen. */
.mk-dots {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
  max-height: 116px;
  overflow-y: auto;
  padding: .45rem;
  border: 1px solid var(--mk-line);
  border-radius: 10px;
  background: var(--mk-soft);
  scrollbar-width: thin;
}
.mk-dot {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  border: 1px solid var(--mk-line);
  background: var(--surface, #fff);
  font: inherit;
  font-size: .72rem;
  color: var(--mk-dim);
  cursor: pointer;
  position: relative;
  flex: 0 0 auto;
}
.mk-dot.done {
  background: var(--mk-key);
  border-color: var(--mk-key);
  color: #fff;
  font-weight: 700;
}
.mk-dot.cur { outline: 2px solid var(--mk-key); outline-offset: 1px; }
/* Painted chip stays compact; the hit area is 40px tall, matching the tap
   target rule the rest of the site already follows. */
.mk-dot::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 50%;
  height: 40px;
  transform: translateY(-50%);
}
.mk-dot.flag::after {
  content: "";
  position: absolute;
  top: -3px;
  right: -3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mk-warn);
  border: 1px solid var(--surface, #fff);
}

/* ── results ─────────────────────────────────────────────────────────── */
.mk-score {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  flex-wrap: wrap;
  margin: .2rem 0 .9rem;
}
.mk-big {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
}
.mk-sub { color: var(--mk-dim); font-size: .9rem; }
.mk-pass {
  font-size: .78rem;
  font-weight: 700;
  padding: .22rem .6rem;
  border-radius: 999px;
  border: 1px solid;
}
.mk-pass.yes {
  color: var(--mk-ok);
  border-color: var(--mk-ok);
  background: color-mix(in srgb, var(--mk-ok) 10%, transparent);
}
.mk-pass.no {
  color: var(--mk-no);
  border-color: var(--mk-no);
  background: color-mix(in srgb, var(--mk-no) 10%, transparent);
}

.mk-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .86rem;
  margin: .9rem 0;
}
.mk-table th,
.mk-table td {
  text-align: left;
  padding: .45rem .6rem;
  border-bottom: 1px solid var(--mk-line);
}
.mk-table th {
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .03em;
  color: var(--mk-dim);
  font-weight: 700;
}
.mk-table td.num,
.mk-table th.num { text-align: right; font-variant-numeric: tabular-nums; }
.mk-bar {
  height: 7px;
  border-radius: 999px;
  background: var(--mk-soft);
  overflow: hidden;
  min-width: 70px;
}
.mk-bar i {
  display: block;
  height: 100%;
  background: var(--mk-key);
  border-radius: 999px;
}
.mk-bar.low i { background: var(--mk-no); }
.mk-bar.mid i { background: var(--mk-warn); }
.mk-bar.high i { background: var(--mk-ok); }

/* ── history / analysis ──────────────────────────────────────────────── */
.mk-hist {
  display: grid;
  gap: .4rem;
  margin: .8rem 0;
}
.mk-run {
  display: flex;
  align-items: center;
  gap: .7rem;
  flex-wrap: wrap;
  padding: .55rem .75rem;
  border: 1px solid var(--mk-line);
  border-radius: 9px;
  background: var(--surface, #fff);
  font-size: .86rem;
}
.mk-run .when { color: var(--mk-dim); font-size: .8rem; min-width: 8.5rem; }
.mk-run .sc { font-weight: 700; font-variant-numeric: tabular-nums; }
.mk-run .pace { margin-left: auto; color: var(--mk-dim); font-size: .8rem; }

.mk-spark {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 56px;
  margin: .5rem 0 .2rem;
}
.mk-spark i {
  flex: 1 1 0;
  min-width: 4px;
  background: var(--mk-key);
  border-radius: 3px 3px 0 0;
  position: relative;
}
.mk-spark i.fail { background: var(--mk-no); }
.mk-axislbl {
  display: flex;
  justify-content: space-between;
  font-size: .72rem;
  color: var(--mk-dim);
}

.mk-review {
  border: 1px solid var(--mk-line);
  border-radius: 10px;
  padding: .8rem .95rem;
  margin: .55rem 0;
  background: var(--surface, #fff);
}
.mk-review.ok { border-left: 3px solid var(--mk-ok); }
.mk-review.no { border-left: 3px solid var(--mk-no); }
.mk-review .q {
  font-size: .92rem;
  line-height: 1.55;
  margin: 0 0 .5rem;
}
.mk-review .ex {
  font-size: .85rem;
  line-height: 1.6;
  color: var(--mk-dim);
  margin: .55rem 0 0;
  padding-top: .55rem;
  border-top: 1px dashed var(--mk-line);
}
.mk-review .ex b { color: var(--text, #16233a); }

.mk-verdict {
  border: 1px solid var(--mk-line);
  border-left: 3px solid var(--mk-key);
  border-radius: 10px;
  background: var(--mk-soft);
  padding: .85rem 1rem;
  margin: 1rem 0;
  font-size: .9rem;
  line-height: 1.65;
}
.mk-verdict ul { margin: .5rem 0 0; padding-left: 1.15rem; }
.mk-verdict li { margin: .2rem 0; }

.mk-hidden { display: none !important; }

/* ── narrow screens ──────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .mk-body { padding: .9rem .85rem 1.1rem; }
  .mk-top { gap: .45rem; padding: .55rem .7rem; }
  .mk-name { font-size: .84rem; width: 100%; margin-right: 0; order: 9; }
  .mk-big { font-size: 2rem; }
  .mk-dots { max-height: 108px; }
  .mk-dot { width: 32px; height: 32px; }
  .mk-scen dl { grid-template-columns: 1fr; gap: 0 .1rem; }
  .mk-scen dd { margin-bottom: .3rem; }
  .mk-table { font-size: .8rem; }
  .mk-table th, .mk-table td { padding: .38rem .4rem; }
  .mk-navrow .mk-btn { flex: 1 1 auto; justify-content: center; }
}
/* ── FOCUS VEIL ───────────────────────────────────────────────────────
   Fullscreen can be refused (it needs a trusted gesture, and iOS Safari has
   no fullscreen on non-video elements). So the exam also gets a fixed
   full-viewport veil that hides the page behind it. Relying on fullscreen
   alone would leave the site visible on exactly the devices where a phone
   student is most likely to abandon a paper. */
.mk-focus-veil {
  position: fixed;
  inset: 0;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: 2147483000;
  background: var(--surface, #fff);
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0;
}
.mk-focus-veil .mk-stage {
  border: 0;
  border-radius: 0;
  min-height: 100vh;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: none;
}
.mk-focus-veil .mk-top { padding: .8rem 1rem; }

/* belt and braces: even without the veil, take the chrome out of the way */
html.mk-focus body > header,
html.mk-focus body > footer,
html.mk-focus body > .sidebar,
html.mk-focus body > .lin-topbar,
html.mk-focus body > #aiFab,
html.mk-focus body > #qnaFab,
html.mk-focus body > .back-top,
html.mk-focus body > #tutReplay { display: none !important; }

/* a phone has no Escape key, so focus mode needs a visible way out */
.mk-quit {
  font: inherit;
  font-size: .82rem;
  min-height: 40px;
  padding: .4rem .8rem;
  border-radius: 8px;
  border: 1px solid var(--mk-line);
  background: transparent;
  color: var(--mk-dim);
  cursor: pointer;
}
.mk-quit:hover { color: var(--mk-no); border-color: var(--mk-no); }