@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Serif:wght@400;500;600&display=swap");

:root {
  --navy: #12203A; --blue: #1B3A7A; --bg: #F2F4F7; --line: #D5DBE5; --line-soft: #E3E8F1; --muted: #4A5870;
  --red: #B3261E; --green: #1E7A4C; --green-d: #16603B; --amber: #8A5200; --amber-d: #7A4600;
  --tint-blue: #E8EDF7; --tint-green: #E4F2EA; --tint-amber: #FFF1D6; --tint-red: #FBEAE8; --paper: #fff;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "IBM Plex Serif", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--navy); font: 15px/1.5 var(--sans); }
a { color: var(--blue); }
a:hover { color: var(--navy); }
h1, h2, h3 { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid #7FA2E8; outline-offset: 2px; }
[hidden] { display: none !important; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---- shell ---- */
.page { min-height: 100vh; display: flex; flex-direction: column; }
.topbar { background: var(--navy); color: #fff; padding: 14px 32px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 14px; }
.logo { width: 40px; height: 40px; border: 1.5px solid #9FB3DD; display: grid; place-items: center; font: 500 11px var(--mono); letter-spacing: .06em; color: #9FB3DD; }
.brand .org { font: 400 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: #9FB3DD; }
.brand .app { font-size: 16px; font-weight: 600; }
.who { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.who .code { font-family: var(--mono); color: #9FB3DD; }
.who a, .who button.linklike { color: #fff; background: none; border: 0; padding: 0; cursor: pointer; text-decoration: underline; }
.tabs { background: #fff; border-bottom: 1px solid var(--line); padding: 0 32px; display: flex; flex-wrap: wrap; gap: 4px; }
.tabs a { padding: 14px 16px; text-decoration: none; color: var(--muted); border-bottom: 3px solid transparent; }
.tabs a:hover { color: var(--navy); }
.tabs a[aria-current="page"] { color: var(--navy); font-weight: 600; border-bottom-color: var(--blue); }
main.wrap { flex: 1; width: 100%; max-width: 1160px; margin: 0 auto; padding: 32px 24px 56px; display: flex; flex-direction: column; gap: 22px; }
main.wide { max-width: 1480px; }
.footer { text-align: center; color: var(--muted); font-size: 12.5px; padding: 0 24px 24px; }

.eyebrow { margin: 0; font: 500 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--blue); }
h1.title { font: 600 30px/1.2 var(--serif); }
h2.sec { font-size: 16px; font-weight: 600; }
.head { display: flex; flex-wrap: wrap; gap: 16px; align-items: flex-end; justify-content: space-between; }
.head > div { display: flex; flex-direction: column; gap: 6px; min-width: 0; }

/* ---- controls ---- */
.btn { font-weight: 600; padding: 10px 18px; border: 1px solid var(--blue); border-radius: 2px; background: var(--blue); color: #fff; min-height: 44px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
.btn:hover { background: var(--navy); border-color: var(--navy); color: #fff; }
.btn.ghost { background: #fff; color: var(--blue); }
.btn.ghost:hover { background: var(--tint-blue); color: var(--navy); }
.btn.danger { background: #fff; color: var(--red); border-color: var(--red); }
.btn.danger:hover { background: var(--tint-red); }
.btn.small { min-height: 34px; padding: 4px 12px; font-size: 13.5px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.btn[disabled]:hover { background: var(--blue); }
.btn.ghost[disabled]:hover { background: #fff; }
label.f { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 500; }
label.f .hint { font-weight: 400; color: var(--muted); font-size: 13px; }
input[type=text], input[type=password], input[type=number], input[type=datetime-local], select, textarea {
  border: 1px solid #98A4BA; border-radius: 2px; padding: 9px 12px; background: #fff; min-height: 42px; width: 100%; font-weight: 400;
}
textarea { resize: vertical; line-height: 1.6; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; }
.check input { margin-top: 4px; width: 18px; height: 18px; }
.msg { padding: 10px 14px; border: 1px solid; font-size: 14px; }
.msg.bad { background: var(--tint-red); border-color: var(--red); color: #7C1A15; }
.msg.ok { background: var(--tint-green); border-color: var(--green); color: var(--green-d); }
.msg.warn { background: var(--tint-amber); border-color: var(--amber); color: var(--amber-d); }
.msg.info { background: var(--tint-blue); border-color: var(--blue); color: var(--navy); }

/* ---- cards ---- */
.card { background: #fff; border: 1px solid var(--line); padding: 20px 22px; display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.card.pad0 { padding: 0; }
.row { display: flex; flex-wrap: wrap; gap: 16px; align-items: stretch; }
.row > .card { flex: 1 1 360px; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; }
.stat { background: #fff; border: 1px solid var(--line); padding: 14px 16px; }
.stat b { display: block; font: 500 28px var(--mono); }
.stat span { color: var(--muted); font-size: 13px; }

/* ---- chips ---- */
.chip { display: inline-block; font-size: 12.5px; font-weight: 600; padding: 3px 10px; border: 1px solid; white-space: nowrap; }
.chip.green { background: var(--tint-green); color: var(--green-d); border-color: var(--green); }
.chip.blue { background: var(--tint-blue); color: var(--blue); border-color: var(--blue); }
.chip.amber { background: var(--tint-amber); color: var(--amber-d); border-color: var(--amber); }
.chip.red { background: var(--tint-red); color: #7C1A15; border-color: var(--red); }
.chip.grey { background: var(--bg); color: var(--muted); border-color: var(--line); }

/* ---- tables ---- */
.tablewrap { overflow-x: auto; }
table.t { width: 100%; border-collapse: collapse; font-size: 14.5px; font-variant-numeric: tabular-nums; }
table.t th { text-align: left; background: var(--bg); font: 500 11.5px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--muted); padding: 12px 16px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.t td { padding: 11px 16px; border-bottom: 1px solid var(--line-soft); vertical-align: middle; }
table.t tr:last-child td { border-bottom: 0; }
table.t .r { text-align: right; }
table.t .m { font-family: var(--mono); }
table.t tr.hl-row { background: #F7F9FD; }

/* ---- sign in ---- */
.signin { flex: 1; display: grid; place-items: center; padding: 40px 24px; }
.signin .box { width: 100%; max-width: 440px; background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--blue); padding: 32px; display: flex; flex-direction: column; gap: 18px; }
.signin h1 { font: 600 26px var(--serif); }

/* ---- exam list ---- */
.exam-card { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--blue); padding: 18px 22px; }
.exam-card.is-open { border-left-color: var(--green); }
.exam-card.is-muted { border-left-color: var(--line); }
.exam-card h3 { font: 600 18px var(--serif); }
.exam-card dl { margin: 6px 0 0; display: flex; flex-wrap: wrap; gap: 4px 22px; font-size: 13.5px; color: var(--muted); }
.exam-card dt { display: none; }
.exam-card dd { margin: 0; }
.exam-card .go { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }

/* ---- exam room ---- */
.room { flex: 1; display: grid; grid-template-columns: minmax(320px, 4fr) minmax(0, 6fr); }
.paper { background: #fff; border-right: 1px solid var(--line); padding: 28px 28px 40px; display: flex; flex-direction: column; gap: 18px; overflow-y: auto; }
.paper .cover { border: 1px solid var(--navy); padding: 14px 16px; display: flex; flex-direction: column; gap: 4px; }
.paper .cover b { font: 600 18px var(--serif); }
.paper .kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; font-size: 14px; }
.paper .kv dt { color: var(--muted); }
.paper .kv dd { margin: 0; font-weight: 500; }
.paper .task { font: 400 17px/1.7 var(--serif); border-left: 4px solid var(--blue); padding-left: 16px; }
.paper ul { margin: 0; padding-left: 20px; font-size: 14px; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }
.desk { padding: 20px 28px 28px; display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.deskbar { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; justify-content: space-between; position: sticky; top: 0; background: var(--bg); padding: 8px 0; z-index: 2; }
.timer { font: 500 30px var(--mono); letter-spacing: .02em; }
.timer.warn { color: var(--amber-d); }
.timer.crit { color: var(--red); }
.meter { display: flex; flex-direction: column; gap: 4px; min-width: 220px; flex: 1 1 220px; max-width: 360px; }
.meter .bar { height: 8px; background: var(--line-soft); position: relative; }
.meter .fill { height: 100%; background: var(--amber); width: 0; transition: width .2s; }
.meter .fill.in { background: var(--green); }
.meter .fill.over { background: var(--red); }
.answer { min-height: 56vh; font: 400 17px/32px var(--serif); padding: 12px 18px; border: 1px solid var(--navy); background: repeating-linear-gradient(#fff 0, #fff 31px, #E3E8F1 31px, #E3E8F1 32px); background-attachment: local; }
.deskfoot { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.saved { font-size: 13.5px; color: var(--muted); }
.saved.bad { color: var(--red); font-weight: 600; }

/* ---- modal ---- */
.overlay { position: fixed; inset: 0; background: rgba(18, 32, 58, .55); display: grid; place-items: center; padding: 20px; z-index: 50; }
.modal { background: #fff; border-top: 4px solid var(--blue); max-width: 480px; width: 100%; padding: 26px; display: flex; flex-direction: column; gap: 14px; }
.modal h2 { font: 600 20px var(--serif); }
.modal .acts { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; }
.modal pre { background: var(--bg); border: 1px solid var(--line); padding: 10px; margin: 0; max-height: 260px; overflow: auto; font: 13px var(--mono); white-space: pre-wrap; }

/* ---- receipt ---- */
.receipt { max-width: 720px; width: 100%; margin: 0 auto; background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--green); padding: 32px; display: flex; flex-direction: column; gap: 24px; }
.receipt h1 { font: 600 28px var(--serif); }
.receipt dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 10px 28px; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); padding: 18px 0; font-size: 14.5px; }
.receipt dt { color: var(--muted); }
.receipt dd { margin: 0; font-weight: 500; }
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 12px; }
.steps li { flex: 1 1 180px; padding: 12px 14px; border: 1px solid; display: flex; flex-direction: column; }
.steps li b { font-weight: 600; }
.steps li small { color: var(--muted); font-size: 13px; }
.steps .done { background: var(--tint-green); border-color: var(--green); color: var(--green-d); }
.steps .now { background: var(--tint-amber); border-color: var(--amber); color: var(--amber-d); }
.steps .todo { background: var(--bg); border-color: var(--line); color: var(--muted); }

/* ---- results ---- */
.score { display: flex; flex-wrap: wrap; gap: 24px; align-items: center; }
.score .big { font: 500 56px/1 var(--mono); }
.score .big small { font-size: 22px; color: var(--muted); }
.crit { border: 1px solid var(--line); background: #fff; padding: 16px 18px; display: flex; flex-direction: column; gap: 10px; }
.crit .top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.crit .letter { font: 600 14px var(--mono); color: var(--blue); }
.crit .mark { font: 500 26px var(--mono); }
.crit .bar { height: 8px; background: var(--line-soft); }
.crit .bar i { display: block; height: 100%; background: var(--blue); }
.crit ul { margin: 0; padding-left: 18px; font-size: 14px; }
.script { font: 400 16.5px/1.85 var(--serif); white-space: pre-wrap; overflow-wrap: anywhere; }
mark.h { padding: 1px 2px; color: inherit; }
mark.h.strength { background: #CDEBD8; box-shadow: 0 -2px 0 #1E7A4C inset; }
mark.h.issue { background: #F8D4CF; box-shadow: 0 -2px 0 #B3261E inset; }
mark.h sup { font: 600 11px var(--mono); margin-left: 2px; color: var(--navy); }
.notes { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.notes li { display: grid; grid-template-columns: 28px 1fr; gap: 8px; font-size: 14.5px; }
.notes .n { font: 600 12px var(--mono); width: 24px; height: 24px; display: grid; place-items: center; background: var(--navy); color: #fff; }
.notes q { font-family: var(--serif); }
.teacher-note { border-left: 4px solid var(--blue); background: var(--tint-blue); padding: 14px 18px; }

/* ---- teacher review ---- */
.review { display: grid; grid-template-columns: 290px minmax(0, 1fr) 360px; gap: 16px; align-items: start; }
.stulist { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); max-height: 78vh; overflow-y: auto; }
.stulist button { text-align: left; background: #fff; border: 0; border-bottom: 1px solid var(--line-soft); padding: 11px 14px; cursor: pointer; display: flex; flex-direction: column; gap: 4px; }
.stulist button:hover { background: var(--bg); }
.stulist button[aria-current="true"] { background: var(--tint-blue); box-shadow: inset 4px 0 0 var(--blue); }
.stulist .nm { font-weight: 600; display: flex; justify-content: space-between; gap: 8px; }
.stulist .sub { font-size: 12.5px; color: var(--muted); display: flex; justify-content: space-between; gap: 8px; }
.marks-panel { background: #fff; border: 1px solid var(--line); display: flex; flex-direction: column; gap: 16px; padding: 18px; position: sticky; top: 12px; }
.mark-row { display: flex; flex-direction: column; gap: 6px; padding-bottom: 14px; border-bottom: 1px solid var(--line-soft); }
.mark-row .l { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; font-weight: 600; }
.mark-row .ai { font-size: 12.5px; color: var(--amber-d); font-weight: 400; }
.mark-row input[type=number] { width: 86px; font: 500 20px var(--mono); text-align: center; }
.mark-row .inline { display: flex; align-items: center; gap: 8px; }
.totalbar { display: flex; justify-content: space-between; align-items: baseline; font-weight: 600; }
.totalbar b { font: 500 30px var(--mono); }
.acts-col { display: flex; flex-direction: column; gap: 10px; }
.bands { display: flex; flex-direction: column; gap: 8px; font: 13px var(--mono); }
.bands .b { display: flex; align-items: center; gap: 12px; }
.bands .b > span:first-child { flex: none; width: 56px; color: var(--muted); }
.bands .tr { flex: 1; height: 22px; background: var(--bg); min-width: 0; }
.bands .tr i { display: block; height: 100%; background: var(--blue); }
.bands .b > span:last-child { flex: none; width: 24px; text-align: right; }
.avg { display: flex; flex-direction: column; gap: 4px; }
.avg .l { display: flex; justify-content: space-between; font-size: 14px; }
.avg .bar { height: 8px; background: var(--line-soft); }
.avg .bar i { display: block; height: 100%; background: var(--blue); }

.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.toolbar select { width: auto; min-width: 260px; }
.spinner { width: 16px; height: 16px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; display: inline-block; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- installer ---- */
body.install { background: var(--bg); }
.install-main { max-width: 640px; margin: 0 auto; padding: 32px 20px 60px; display: flex; flex-direction: column; gap: 14px; }
.install-main h1 { font: 600 28px var(--serif); }
.install-main h2 { font-size: 16px; margin-top: 10px; }
.install-main form { display: flex; flex-direction: column; gap: 14px; background: #fff; border: 1px solid var(--line); padding: 22px; }
.install-main form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 500; }
.install-main input { border: 1px solid #98A4BA; border-radius: 2px; padding: 9px 12px; min-height: 42px; font: inherit; width: 100%; }
.install-main .btn { align-self: flex-start; border: 1px solid var(--blue); }
.checks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.checks li { padding: 8px 12px; border: 1px solid; font-size: 14px; }
.checks li.ok { background: var(--tint-green); border-color: var(--green); color: var(--green-d); }
.checks li.bad { background: var(--tint-red); border-color: var(--red); color: #7C1A15; }
.note { padding: 14px 16px; border: 1px solid; }
.note-ok { background: var(--tint-green); border-color: var(--green); }
.note-warn { background: var(--tint-amber); border-color: var(--amber); }
.note-bad { background: var(--tint-red); border-color: var(--red); }
code { background: #E8EDF7; padding: 1px 5px; font: 13px var(--mono); }

@media (max-width: 1100px) { .review { grid-template-columns: 1fr; } .marks-panel { position: static; } .stulist { max-height: 260px; } }
@media (max-width: 860px) { .room { grid-template-columns: 1fr; } .paper { border-right: 0; border-bottom: 1px solid var(--line); } .topbar, .tabs { padding-left: 16px; padding-right: 16px; } }

@media print {
  .topbar, .tabs, .no-print, .footer { display: none !important; }
  body { background: #fff; }
  main.wrap { padding: 0; max-width: none; }
  .card, .crit { break-inside: avoid; }
}