/* Exam hall screens: instructions, confirmation, test, palette. */
html, body { height: 100%; }
.band { background: var(--blue-dk); color: #fff; }
.band .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 10px; flex-wrap: wrap; }
.page { max-width: 920px; margin: 0 auto; padding-block: 24px 40px; }
.inst h1 { font-size: 22px; margin: 0 0 6px; }
.inst h2 { font-size: 17px; margin: 22px 0 8px; color: var(--blue-dk); }
.inst ol { padding-left: 20px; margin: 0; }
.inst li { margin-bottom: 7px; }
.legend { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; margin: 8px 0; }
.legend div { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.sw { width: 20px; height: 20px; border-radius: 3px; display: inline-grid; place-items: center; position: relative; flex: none; font-size: 10px; color: #fff; font-weight: 700; }
.sw i { position: absolute; top: -8px; right: -7px; color: var(--star); font-style: normal; font-size: 13px; }
.sw.g { background: var(--green); } .sw.r { background: var(--red); } .sw.b { background: var(--beige); border: 1px solid #D9C79E; color: var(--beige-ink); }
.mock { border: 1px solid var(--line); border-radius: 6px; overflow: hidden; font-size: 12px; margin: 10px 0; }
.mock .mt { background: var(--blue-dk); color: #fff; padding: 6px 10px; display: flex; justify-content: space-between; gap: 8px; }
.mock .mb { display: grid; grid-template-columns: 1fr 130px; min-height: 120px; }
.mock .mq { padding: 10px; border-right: 1px solid var(--line); display: flex; flex-direction: column; justify-content: space-between; gap: 8px; }
.mock .mp { padding: 10px; background: var(--bg2); }
.mock .tag { display: inline-block; background: var(--blue-lt); color: var(--blue-dk); border: 1px dashed var(--blue); padding: 2px 6px; border-radius: 3px; margin: 2px; }
.chk { display: flex; gap: 10px; align-items: flex-start; margin-top: 16px; font-weight: 500; }
.chk input { margin-top: 4px; width: 18px; height: 18px; flex: none; }
.dl { display: grid; grid-template-columns: 190px 1fr; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.dl div { padding: 10px 12px; border-bottom: 1px solid var(--line); }
.dl div:nth-child(odd) { background: var(--bg2); font-weight: 600; color: var(--muted); font-size: 13px; }
.dl div:nth-last-child(-n+2) { border-bottom: 0; }
.dl .v { font-family: var(--mono); font-weight: 700; overflow-wrap: anywhere; }
@media (max-width: 520px) { .dl { grid-template-columns: 1fr; } .dl div:nth-child(odd) { border-bottom: 0; padding-bottom: 2px; } }

/* test screen */
#s-exam { height: 100%; display: flex; flex-direction: column; }
.xbar { background: var(--blue-dk); color: #fff; }
.xbar .wrap { display: flex; gap: 8px 22px; align-items: center; flex-wrap: wrap; padding-block: 8px; }
.xbar .f { font-size: 11px; opacity: .8; display: block; text-transform: uppercase; letter-spacing: .5px; }
.xbar .v { font-weight: 600; font-size: 14px; }
.xbar .sp { flex: 1; }
.timer { font-family: var(--mono); font-size: 20px; font-weight: 700; background: #fff; color: var(--blue-dk); padding: 4px 12px; border-radius: 4px; font-variant-numeric: tabular-nums; }
.timer.low { background: var(--red); color: #fff; }
.xbody { flex: 1; display: grid; grid-template-columns: 1fr 300px; min-height: 0; }
.qpane { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.qhead { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding-block: 10px; border-bottom: 1px solid var(--line); background: var(--bg2); flex-wrap: wrap; }
.qhead b { color: var(--blue-dk); }
.mark { font-size: 12px; color: var(--muted); }
.qscroll { flex: 1; overflow: auto; padding-block: 18px; position: relative; user-select: none; -webkit-user-select: none; background-repeat: repeat; }
.opts { display: flex; flex-direction: column; gap: 10px; max-width: 75ch; }
.opt { display: flex; gap: 12px; align-items: flex-start; padding: 11px 14px; border: 1px solid var(--line); border-radius: 5px; cursor: pointer; background: rgba(255,255,255,.92); }
.opt:hover { border-color: var(--blue); }
.opt input { margin-top: 3px; width: 18px; height: 18px; accent-color: var(--blue); flex: none; }
.opt.sel { border-color: var(--blue); background: var(--blue-lt); }
.opt .k { font-weight: 700; color: var(--blue-dk); min-width: 18px; }
.saved { font-size: 12px; font-weight: 600; min-height: 18px; }
.saved.ok { color: var(--green); } .saved.wait { color: var(--muted); } .saved.bad { color: var(--red); }
.qfoot { border-top: 1px solid var(--line); background: var(--bg2); }
.qfoot .wrap { display: flex; gap: 8px; align-items: center; padding-block: 10px; flex-wrap: wrap; }
.qfoot .sp { flex: 1; }
.btn.flag.on { background: var(--star); border-color: #C99700; color: #3a2b00; }

.pal { border-left: 1px solid var(--line); background: var(--bg2); display: flex; flex-direction: column; min-height: 0; }
.pal-h { padding: 12px 14px; border-bottom: 1px solid var(--line); font-weight: 700; color: var(--blue-dk); display: flex; justify-content: space-between; align-items: center; }
.pal-legend { padding: 10px 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 10px; font-size: 12px; border-bottom: 1px solid var(--line); }
.pal-legend div { display: flex; align-items: center; gap: 6px; }
.pal-grid { padding: 14px; display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; overflow: auto; align-content: start; flex: 1; }
.qn { position: relative; aspect-ratio: 1; border-radius: 4px; border: 1px solid transparent; font-weight: 700; font-size: 13px; display: grid; place-items: center; font-variant-numeric: tabular-nums; padding: 0; }
.qn.nv { background: var(--beige); color: var(--beige-ink); border-color: #D9C79E; }
.qn.nans { background: var(--red); color: #fff; }
.qn.ans { background: var(--green); color: #fff; }
.qn.cur { outline: 3px solid var(--blue); outline-offset: 2px; }
.qn .st { position: absolute; top: -7px; right: -6px; color: var(--star); font-size: 15px; line-height: 1; text-shadow: 0 0 2px #6b5300; }
.pal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 12px 14px; border-top: 1px solid var(--line); }
.pal-actions .btn { padding: 8px 6px; font-size: 13px; }
.pal-x, .pal-toggle { display: none !important; }
@media (max-width: 780px) {
  .xbody { grid-template-columns: 1fr; }
  .pal { position: fixed; top: 0; right: 0; bottom: 0; width: min(320px, 88vw); z-index: 40; transform: translateX(105%); transition: transform .2s;
    padding-top: env(safe-area-inset-top, 0px); padding-right: env(safe-area-inset-right, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); box-shadow: -6px 0 20px rgba(0,0,0,.2); }
  .pal.open { transform: none; }
  .pal-x, .pal-toggle { display: inline-flex !important; }
  .xbar .hide-sm { display: none; }
}
@media (prefers-reduced-motion: reduce) { .pal { transition: none; } }

/* calculator */
.calc { position: fixed; right: max(16px, env(safe-area-inset-right, 0px)); bottom: calc(80px + env(safe-area-inset-bottom, 0px)); width: 240px; background: #fff; border: 1px solid var(--line); border-radius: 6px; box-shadow: 0 8px 24px rgba(0,0,0,.2); z-index: 50; }
.calc-h { background: var(--blue); color: #fff; padding: 6px 10px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; font-weight: 600; border-radius: 6px 6px 0 0; }
.calc-h button { background: none; border: 0; color: #fff; font-size: 18px; line-height: 1; }
.calc-d { margin: 10px; padding: 8px; border: 1px solid var(--line); border-radius: 4px; font-family: var(--mono); text-align: right; font-size: 18px; min-height: 40px; overflow-x: auto; white-space: nowrap; background: var(--bg2); }
.calc-k { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; padding: 0 10px 10px; }
.calc-k button { padding: 9px 0; border: 1px solid var(--line); background: #fff; border-radius: 4px; font-weight: 600; }
.calc-k button.o { background: var(--blue-lt); color: var(--blue-dk); }
.calc-k button.eq { background: var(--blue); color: #fff; border-color: var(--blue); }

.overlay-msg { position: fixed; inset: 0; background: rgba(15,25,45,.7); display: grid; place-items: center; z-index: 90; padding: 16px; }