/* Layout: SEB-style kiosk — full-height exam surface with a Windows-like taskbar pinned
   to the bottom; Moodle-style quiz body (info box, question, navigation grid). */
:root {
  --bg: #e7eaee;
  --panel: #ffffff;
  --panel-2: #f6f7f9;
  --ink: #1d2125;
  --muted: #5d6670;
  --line: #d7dce1;
  --brand: #0f6cbf;
  --brand-ink: #ffffff;
  --brand-soft: #e3eefa;
  --head: #1a3553;
  --head-ink: #f2f6fa;
  --task: #eef0f2;
  --task-ink: #1d2125;
  --task-hover: #dfe3e8;
  --ok: #2e7d32;
  --ok-soft: #e4f2e5;
  --bad: #c62828;
  --bad-soft: #fbe7e7;
  --warn: #b26a00;
  --warn-soft: #fff3df;
  --flag: #d32f2f;
  --fig-ink: #1d2125;
  --fig-paper: #ffffff;
  --fig-grey: #a9b1ba;
  --fig-shade: #b9d3ee;
  --fig-t1: #f3f5f8;
  --fig-t2: #c9d2dc;
  --fig-t3: #8d99a6;
  --font: "Segoe UI", "Segoe UI Web (West European)", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: Consolas, "SF Mono", Menlo, monospace;
  --fs: 15px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121519; --panel: #1c2026; --panel-2: #22272e; --ink: #e5e8eb; --muted: #9aa4ae; --line: #343b44;
    --brand: #5aa2e6; --brand-ink: #0c1620; --brand-soft: #1d3247; --head: #0d1d2e; --head-ink: #e5edf5;
    --task: #1a1d21; --task-ink: #e5e8eb; --task-hover: #2a2f36; --ok: #66bb6a; --ok-soft: #1b2e1c; --bad: #ef6b6b; --bad-soft: #3a1f1f;
    --warn: #f0b252; --warn-soft: #3a2e17; --flag: #ff6b6b; --fig-ink: #e5e8eb; --fig-paper: #1c2026; --fig-grey: #69737e;
    --fig-shade: #2c4a69; --fig-t1: #3a424c; --fig-t2: #2a3038; --fig-t3: #1d2228; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121519; --panel: #1c2026; --panel-2: #22272e; --ink: #e5e8eb; --muted: #9aa4ae; --line: #343b44;
  --brand: #5aa2e6; --brand-ink: #0c1620; --brand-soft: #1d3247; --head: #0d1d2e; --head-ink: #e5edf5;
  --task: #1a1d21; --task-ink: #e5e8eb; --task-hover: #2a2f36; --ok: #66bb6a; --ok-soft: #1b2e1c; --bad: #ef6b6b; --bad-soft: #3a1f1f;
  --warn: #f0b252; --warn-soft: #3a2e17; --flag: #ff6b6b; --fig-ink: #e5e8eb; --fig-paper: #1c2026; --fig-grey: #69737e;
  --fig-shade: #2c4a69; --fig-t1: #3a424c; --fig-t2: #2a3038; --fig-t3: #1d2228; color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { font-size: var(--fs); }
body {
  margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 1rem; line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
button, input, select { font: inherit; color: inherit; }
a { color: var(--brand); }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
[hidden] { display: none !important; }

#app { min-height: 100%; padding-bottom: calc(44px + env(safe-area-inset-bottom, 0px)); display: flex; flex-direction: column; }

/* ---------- header */
.bar {
  background: var(--head); color: var(--head-ink);
  padding-block: 10px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.bar .logo { width: 30px; height: 30px; border-radius: 4px; background: var(--brand); color: var(--brand-ink); display: grid; place-items: center; font-weight: 700; font-size: 13px; flex: none; }
.bar .ttl { min-width: 0; flex: 1; }
.bar .ttl b { display: block; font-size: 1.05rem; font-weight: 600; letter-spacing: .01em; }
.bar .ttl span { display: block; font-size: .82rem; opacity: .8; }
.bar .who { font-size: .85rem; opacity: .9; text-align: right; }
.timer {
  font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 1.05rem; padding: 4px 10px; border-radius: 4px;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25); white-space: nowrap;
}
.timer.low { background: var(--bad); border-color: var(--bad); color: #fff; }

/* ---------- generic */
.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding-block: 20px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 18px 20px; }
.card + .card { margin-top: 16px; }
h1, h2, h3 { text-wrap: balance; line-height: 1.25; margin: 0 0 .6em; }
h2 { font-size: 1.25rem; font-weight: 600; }
h3 { font-size: 1.05rem; font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: .86rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 7px 16px; border-radius: 4px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel-2); color: var(--ink); text-decoration: none; min-height: 36px;
}
.btn:hover { border-color: var(--muted); }
.btn.pri { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); font-weight: 600; }
.btn.pri:hover { filter: brightness(1.08); }
.btn.danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn:disabled { opacity: .5; cursor: default; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.grow { flex: 1; }
.tag { display: inline-block; font-size: .75rem; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
table.t { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; font-size: .92rem; }
table.t th, table.t td { padding: 7px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.t th { background: var(--panel-2); font-weight: 600; }
table.t td.n, table.t th.n { text-align: right; }
.tscroll { overflow-x: auto; }

/* ---------- home */
.sets { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.setcard { border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; background: var(--panel-2); cursor: pointer; display: flex; flex-direction: column; gap: 6px; text-align: left; }
.setcard[aria-pressed="true"] { border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand); background: var(--brand-soft); }
.setcard b { font-size: 1.1rem; }
.modes { display: grid; gap: 8px; }
.modes label { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border: 1px solid var(--line); border-radius: 4px; cursor: pointer; }
.modes label:has(input:checked) { border-color: var(--brand); background: var(--brand-soft); }
.field { display: grid; gap: 4px; }
.field input, .field select { padding: 7px 10px; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); min-height: 36px; }
.cols2 { display: grid; grid-template-columns: 1.3fr 1fr; gap: 16px; }
.notice { border-left: 4px solid var(--warn); background: var(--warn-soft); padding: 10px 14px; border-radius: 0 4px 4px 0; }
.resume { border-left: 4px solid var(--brand); background: var(--brand-soft); padding: 12px 14px; border-radius: 0 4px 4px 0; }

/* ---------- exam */
.exam { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 16px; align-items: start; }
.qcard { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; display: grid; grid-template-columns: 150px minmax(0, 1fr); }
.qinfo { background: var(--panel-2); border-right: 1px solid var(--line); padding: 14px; font-size: .85rem; display: flex; flex-direction: column; gap: 6px; border-radius: 6px 0 0 6px; }
.qinfo .qno { font-size: 1rem; }
.qinfo .qno b { font-size: 1.3rem; }
.flagbtn { background: none; border: 0; padding: 4px 0; color: var(--brand); cursor: pointer; text-align: left; display: inline-flex; gap: 6px; align-items: center; }
.flagbtn[aria-pressed="true"] { color: var(--flag); font-weight: 600; }
.qbody { padding: 16px 20px 18px; min-width: 0; }
.instr { font-style: italic; color: var(--muted); font-size: .9rem; margin-bottom: 10px; }
.instr ul { margin: 4px 0 0; padding-left: 18px; }
.stem { margin-bottom: 14px; overflow-wrap: anywhere; }
.stem p { margin: 0 0 .6em; }
.opts { display: grid; gap: 6px; margin: 0; padding: 0; border: 0; }
.opt { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border: 1px solid transparent; border-radius: 4px; cursor: pointer; }
.opt:hover { background: var(--panel-2); border-color: var(--line); }
.opt input { margin-top: 4px; accent-color: var(--brand); flex: none; }
.opt .l { font-weight: 600; min-width: 1.4em; }
.opt .tx { min-width: 0; overflow-wrap: anywhere; }
.opt:has(input:checked) { background: var(--brand-soft); border-color: var(--brand); }
.clear { background: none; border: 0; color: var(--brand); padding: 6px 0; cursor: pointer; font-size: .88rem; }
.qnav { display: flex; justify-content: space-between; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 18px; }
.passage { border: 1px solid var(--line); border-radius: 4px; background: var(--panel-2); padding: 12px 14px; max-height: 62vh; overflow: auto; font-size: .95rem; line-height: 1.65; }
.passage h3 { font-size: 1rem; }
.passage p { margin: 0 0 .7em; }
.pn { color: var(--muted); font-size: .8rem; font-variant-numeric: tabular-nums; }
.nav { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 14px; position: sticky; top: 12px; }
.nav h3 { font-size: .95rem; margin-bottom: 10px; }
.navgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(34px, 1fr)); gap: 5px; }
.navgrid button {
  position: relative; height: 36px; border: 1px solid var(--line); border-radius: 3px; background: var(--panel); cursor: pointer; font-size: .82rem;
  font-variant-numeric: tabular-nums; padding: 0; overflow: hidden;
}
.navgrid button::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 40%; background: transparent; }
.navgrid button.ans::after { background: var(--fig-grey); }
.navgrid button.ans { font-weight: 600; }
.navgrid button.cur { outline: 2px solid var(--brand); outline-offset: -1px; }
.navgrid button.flg::before { content: ""; position: absolute; top: 0; right: 0; border-style: solid; border-width: 0 10px 10px 0; border-color: transparent var(--flag) transparent transparent; }
.navgrid button span { position: relative; z-index: 1; }
.legend { display: grid; gap: 4px; font-size: .78rem; color: var(--muted); margin: 12px 0; }
.legend i { display: inline-block; width: 14px; height: 14px; border: 1px solid var(--line); vertical-align: -2px; margin-right: 6px; border-radius: 2px; }
.legend i.a { background: linear-gradient(to top, var(--fig-grey) 40%, var(--panel) 40%); }
.legend i.f { background: linear-gradient(225deg, var(--flag) 30%, var(--panel) 30%); }
.legend i.c { outline: 2px solid var(--brand); outline-offset: -1px; }
.navstat { font-size: .82rem; color: var(--muted); margin-bottom: 8px; font-variant-numeric: tabular-nums; }
.drawer-btn { display: none; }

/* question content helpers */
.kw { font-weight: 700; letter-spacing: .03em; }
.seq { font-weight: 600; font-variant-numeric: tabular-nums; }
.fr { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; font-size: .9em; line-height: 1.15; margin: 0 1px; }
.fr > span:first-child { border-bottom: 1px solid currentColor; padding: 0 2px; }
.fr > span:last-child { padding: 0 2px; }
ol.stmts { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 4px; }
ol.stmts .sn { font-weight: 600; margin-right: 4px; }
.sebab { border: 1px solid var(--line); border-radius: 4px; padding: 10px 14px; background: var(--panel-2); }
.sebab p { margin: 0; }
.sebab-kw { font-weight: 700; letter-spacing: .2em; text-align: center; margin: 6px 0 !important; color: var(--muted); font-size: .85rem; }
ul.rules { margin: .4em 0 0; padding-left: 20px; display: grid; gap: 4px; }
.blank { display: inline-block; min-width: 7em; border-bottom: 1.5px solid currentColor; margin: 0 2px; vertical-align: baseline; }
.ersent { line-height: 2.6; margin: 0; }
.ul { display: inline-flex; flex-direction: column; align-items: center; line-height: 1.3; vertical-align: top; margin: 0 1px; }
.ul u { text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
.ul b { font-size: .72rem; color: var(--muted); }
.vsent { font-style: italic; margin: 0 0 .5em; }

/* figures */
.fig { max-width: 100%; height: auto; display: inline-block; vertical-align: middle; }
.figwrap, .figc, .netwrap { margin: 10px 0; }
.fig .ink, .fig.ink { stroke: var(--fig-ink); stroke-width: 1.6; fill: none; stroke-linejoin: round; }
.fig .thin { stroke-width: 1; }
.fig .thick { stroke-width: 2.6; stroke-linecap: round; }
.fig .rev { stroke: var(--fig-paper); fill: none; }
.fig .ink-fill { fill: var(--fig-ink); }
.fig .rev-fill { fill: var(--fig-paper); }
.fig .paper { fill: var(--fig-paper); }
.fig .solid { fill: var(--fig-ink); }
.fig .grey { fill: var(--fig-grey); }
.fig .grey-fill { fill: var(--fig-grey); opacity: .75; }
.fig .shade { fill: var(--fig-shade); }
.fig .shade-l { fill: var(--fig-shade); fill-opacity: .55; }
.fig .nofill { fill: none; }
.fig .t1 { fill: var(--fig-t1); stroke-width: 1; }
.fig .t2 { fill: var(--fig-t2); stroke-width: 1; }
.fig .t3 { fill: var(--fig-t3); stroke-width: 1; }
.fig .faint { stroke: var(--line); fill: none; stroke-width: 1; }
.fig .cellbox { stroke: var(--line); stroke-width: 1; fill: var(--fig-paper); }
.fig text, .fig .lbl { fill: var(--fig-ink); font-family: var(--font); font-size: 13px; stroke: none; }
.fig .big { font-size: 26px; font-weight: 600; }
.mgrid { display: inline-grid; grid-template-columns: repeat(3, auto); gap: 4px; padding: 6px; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); margin: 10px 0; }
.srow { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; }
.views { display: flex; flex-wrap: wrap; gap: 18px; align-items: flex-end; margin: 10px 0; }
.opt .fig.cell { width: 84px; }
.opt .fig.cubev { width: 104px; }
.opts.figs { grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 8px; }
.opts.figs .opt { border-color: var(--line); flex-wrap: wrap; justify-content: flex-start; }

/* ---------- modal */
.modal-bg { position: fixed; inset: 0; background: rgba(10, 16, 24, .55); display: grid; place-items: center; z-index: 50; padding: 16px; }
.modal { background: var(--panel); color: var(--ink); border-radius: 6px; max-width: 520px; width: 100%; border: 1px solid var(--line); box-shadow: 0 20px 50px rgba(0,0,0,.3); }
.modal header { padding: 12px 18px; border-bottom: 1px solid var(--line); font-weight: 600; }
.modal .mb { padding: 16px 18px; }
.modal footer { padding: 12px 18px; border-top: 1px solid var(--line); display: flex; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }

/* ---------- taskbar (SEB) */
.taskbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; height: calc(44px + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px); padding-left: max(6px, env(safe-area-inset-left, 0px)); padding-right: max(6px, env(safe-area-inset-right, 0px));
  background: var(--task); color: var(--task-ink); border-top: 1px solid var(--line); display: flex; align-items: stretch; gap: 2px;
  font-size: 12.5px; user-select: none;
}
.tb { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 0 10px; background: none; border: 0; cursor: pointer; color: inherit; min-width: 40px; }
.tb:hover { background: var(--task-hover); }
.tb svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.6; }
.tb.app { border-bottom: 2px solid var(--brand); max-width: 260px; }
.tb.app span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tb.quit { color: var(--bad); }
.tb.clock { flex-direction: column; gap: 0; line-height: 1.15; font-variant-numeric: tabular-nums; cursor: default; padding: 0 8px; }
.tsp { flex: 1; }

/* ---------- results */
.score-hero { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; }
.metric { border: 1px solid var(--line); border-radius: 6px; padding: 12px 14px; background: var(--panel-2); }
.metric .v { font-size: 1.7rem; font-weight: 600; font-variant-numeric: tabular-nums; line-height: 1.1; }
.metric .v small { font-size: .9rem; font-weight: 400; color: var(--muted); }
.metric .k { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; font-weight: 600; }
.metric .s { font-size: .82rem; color: var(--muted); margin-top: 2px; }
.bars { display: grid; gap: 8px; }
.barrow { display: grid; grid-template-columns: minmax(0, 200px) minmax(0, 1fr) 64px; gap: 10px; align-items: center; font-size: .88rem; }
.barrow .track { height: 14px; background: var(--panel-2); border: 1px solid var(--line); border-radius: 3px; position: relative; overflow: hidden; }
.barrow .fill { position: absolute; inset: 0 auto 0 0; background: var(--brand); }
.barrow .fill.ok { background: var(--ok); }
.barrow .fill.mid { background: var(--warn); }
.barrow .fill.low { background: var(--bad); }
.barrow .val { text-align: right; font-variant-numeric: tabular-nums; }
.pill { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.na { background: var(--panel-2); color: var(--muted); border: 1px solid var(--line); }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tabs button { padding: 5px 12px; border: 1px solid var(--line); background: var(--panel-2); border-radius: 999px; cursor: pointer; font-size: .85rem; }
.tabs button[aria-pressed="true"] { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.rv { border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; background: var(--panel); }
.rv + .rv { margin-top: 10px; }
.rv .rh { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; font-size: .85rem; }
.rv .ropt { display: flex; gap: 8px; padding: 5px 8px; border-radius: 4px; }
.rv .ropt.key { background: var(--ok-soft); }
.rv .ropt.wrong { background: var(--bad-soft); }
.rv .exp { margin-top: 10px; padding: 10px 12px; border-left: 3px solid var(--brand); background: var(--panel-2); font-size: .92rem; }
.rv details summary { cursor: pointer; color: var(--brand); font-size: .88rem; margin: 6px 0; }
.chart svg { width: 100%; height: auto; display: block; }
.chart text { fill: var(--muted); font-size: 11px; font-family: var(--font); }
.chart .gridl { stroke: var(--line); stroke-width: 1; }
.chart .b1 { fill: var(--brand); }
.chart .b2 { fill: var(--fig-grey); }
.chart .bok { fill: var(--ok); }
.chart .bbad { fill: var(--bad); }
.foot { font-size: .8rem; color: var(--muted); text-align: center; padding: 18px 16px 8px; }

/* exam surface behaves like a kiosk: no accidental selection */
.kiosk .qbody, .kiosk .nav { -webkit-user-select: none; user-select: none; }

@media (max-width: 900px) {
  .exam { grid-template-columns: minmax(0, 1fr); }
  .nav { position: fixed; z-index: 45; right: 0; top: 0; bottom: calc(44px + env(safe-area-inset-bottom, 0px)); width: min(300px, 86vw); border-radius: 0; overflow: auto; transform: translateX(105%); transition: transform .2s ease; padding-top: calc(14px + env(safe-area-inset-top, 0px)); }
  .nav.open { transform: none; box-shadow: -10px 0 30px rgba(0,0,0,.25); }
  .drawer-btn { display: inline-flex; }
  .split { grid-template-columns: minmax(0, 1fr); }
  .passage { max-height: 40vh; }
  .cols2 { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 600px) {
  .qcard { grid-template-columns: minmax(0, 1fr); }
  .qinfo { border-right: 0; border-bottom: 1px solid var(--line); flex-direction: row; flex-wrap: wrap; align-items: center; gap: 4px 14px; border-radius: 6px 6px 0 0; }
  .qbody { padding: 14px; }
  .tb.hide-s { display: none; }
  .barrow { grid-template-columns: minmax(0, 1fr) 54px; }
  .barrow .track { grid-column: 1 / -1; grid-row: 2; }
  .bar { gap: 8px 10px; padding-block: 8px; }
  .bar .logo { display: none; }
  .bar .ttl b { font-size: .95rem; }
  .bar .ttl span { font-size: .78rem; }
  .bar .who { text-align: left; flex-basis: 100%; font-size: .78rem; }
  .in-exam .bar .who { display: none; }
  .timer { font-size: .95rem; padding: 3px 8px; }
}
@media (prefers-reduced-motion: reduce) { .nav { transition: none; } }