:root {
  --ink: #16324F; --ink-soft: #4A6178; --paper: #F7F9FB; --sheet: #FFFFFF; --line: #D8E0E8;
  --good: #1F7A4D; --warn: #A8620A; --bad: #B3261E;
  --sans: "Public Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --prose: 75ch;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #DCE6F0; --ink-soft: #9AAEC2; --paper: #0F1923; --sheet: #16222E; --line: #2A3A4A;
    --good: #5CC48D; --warn: #E3A44A; --bad: #F08A80;
  }
}
:root[data-theme="dark"] {
  --ink: #DCE6F0; --ink-soft: #9AAEC2; --paper: #0F1923; --sheet: #16222E; --line: #2A3A4A;
  --good: #5CC48D; --warn: #E3A44A; --bad: #F08A80;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 var(--sans); }
.wrap { max-width: 1100px; margin: 0 auto; padding: 24px 16px 64px; }
.hint { color: var(--ink-soft); font-size: 14px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 10; background: var(--sheet); border-bottom: 1px solid var(--line); }
.topbar-inner { max-width: 1100px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 12px 20px; align-items: center; flex-wrap: wrap; }
.candidate { font-weight: 700; }
.signout { font-size: 14px; color: var(--ink-soft); }

/* Until the page knows what to show: only "Loading…" */
.loading { display: none; }
.is-loading .loading { display: block; max-width: 1100px; margin: 48px auto; padding: 0 16px; color: var(--ink-soft); }
.is-loading .topbar, .is-loading main { display: none; }
.timer { margin-left: auto; display: flex; gap: 10px; align-items: center; }
.clock { font: 500 1.25rem var(--serif); font-variant-numeric: tabular-nums; min-width: 4ch; text-align: right; }

/* buttons */
button { font: 600 15px var(--sans); border-radius: 6px; padding: 10px 18px; cursor: pointer; }
button.primary { background: var(--ink); color: var(--paper); border: 1px solid var(--ink); }
button.secondary { background: transparent; color: var(--ink); border: 1px solid var(--line); }
button.small { font-size: 13px; padding: 6px 12px; }
button:disabled { opacity: .5; cursor: not-allowed; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* scenario */
.card { background: var(--sheet); border: 1px solid var(--line); border-radius: 10px; }
.scenario summary { cursor: pointer; padding: 14px 18px; display: flex; gap: 12px; align-items: baseline; list-style: none; }
.scenario summary::-webkit-details-marker { display: none; }
.scenario summary::before { content: "▾"; color: var(--ink-soft); }
.scenario:not([open]) summary::before { content: "▸"; }
.summary-title { font-weight: 700; }
.summary-preview { color: var(--ink-soft); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; flex: 1; }
.scenario[open] .summary-preview { display: none; }
.scenario-body { padding: 0 18px 16px; }
.scenario-body p { max-width: var(--prose); font: 17px/1.6 var(--serif); margin: 0 0 12px; }
.scenario-body .role { font: 15px var(--sans); color: var(--ink-soft); }
pre.code-block { background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 12px 14px; overflow-x: auto; font: 14px/1.55 var(--mono); margin: 0 0 12px; }

/* parts */
.part { margin-top: 36px; }
.part-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; }
.part-head h2 { font: 500 1.35rem/1.25 var(--serif); margin: 0; }
.task { max-width: var(--prose); font: 17px/1.6 var(--serif); margin: 8px 0 12px; white-space: pre-wrap; }
textarea.answer {
  display: block; width: 100%;
  min-height: calc(6 * 1.6em + 26px); resize: none; overflow: hidden;
  font: 17px/1.6 var(--serif); color: var(--ink); background: var(--sheet);
  border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px;
}
textarea.answer.code { font: 15px/1.6 var(--mono); tab-size: 2; white-space: pre; overflow-x: auto; }
.part-meta { display: flex; gap: 16px; font-size: 13px; color: var(--ink-soft); margin-top: 6px; }
.part-meta .saved { margin-left: auto; }
.part-meta .saved.error { color: var(--bad); }

/* submit */
.submit-row { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.status { margin: 0; color: var(--ink-soft); }
.status.error { color: var(--bad); }

/* messages on the candidate page */
.notice { padding: 24px; margin-top: 24px; }
.notice h1 { font: 500 1.6rem var(--serif); margin: 0 0 8px; }
.notice p { margin: 0; color: var(--ink-soft); }
.preview-banner { margin: 0; padding: 8px 16px; text-align: center; font-weight: 600; background: var(--warn); color: #fff; }

/* ---------- admin ---------- */
#view:focus { outline: none; } /* focused only to move screen readers to the new view */
.admin h1 { font: 500 1.8rem/1.2 var(--serif); margin: 8px 0 16px; }
.admin h2 { font: 600 1.05rem var(--sans); margin: 0; }
.admin a { color: var(--ink); }
.brand { font-weight: 700; text-decoration: none; }
.toplink { margin-left: auto; }
a.button { display: inline-block; text-decoration: none; font: 600 15px var(--sans); border-radius: 6px; padding: 10px 18px; }
a.button.secondary { border: 1px solid var(--line); color: var(--ink); }
a.button.primary { background: var(--ink); color: var(--paper); border: 1px solid var(--ink); }
.welcome p + p { margin-top: 8px; }
.welcome-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
a.button.small { font-size: 13px; padding: 6px 12px; }
button.link { background: none; border: 0; padding: 4px 0; font: 600 13px var(--sans); text-decoration: underline; cursor: pointer; color: var(--ink); }
button.link.danger { color: var(--bad); }

.admin label { display: block; font-weight: 600; font-size: 14px; margin: 12px 0 4px; }
.admin label.check { display: flex; gap: 8px; align-items: center; font-weight: 600; margin: 12px 0 0; }
.admin label.check input { width: auto; }
.admin input[type=text], .admin input[type=number], .admin select, .admin textarea {
  width: 100%; font: 15px/1.5 var(--sans); color: var(--ink); background: var(--paper);
  border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px;
}
.admin textarea { resize: vertical; }
.admin textarea.grow { resize: none; overflow: hidden; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: end; }
.row > * { flex: 1 1 140px; }
.row > .grow-2 { flex: 3 1 240px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 700px) { .two { grid-template-columns: 1fr; } }

.new-case { padding: 16px 18px; margin-bottom: 20px; }
.new-case label { margin-top: 0; }
.new-case .row > button { flex: 0 0 auto; }
.case-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.case-row, .editor-head { padding: 16px 18px; display: grid; gap: 10px; }
.case-main { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.case-main h1 { margin: 0; }
.case-link { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.case-link code { font: 13px var(--mono); background: var(--paper); border: 1px solid var(--line); border-radius: 4px; padding: 4px 8px; overflow-wrap: anywhere; }
.case-actions { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.editor-head #publishBtn { margin-left: auto; }

.pill { font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 99px; border: 1px solid currentColor; white-space: nowrap; }
.pill.draft { color: var(--ink-soft); }
.pill.published { color: var(--good); }
.pill.changed { color: var(--warn); }
.saved { font-size: 13px; color: var(--ink-soft); }
.saved.error { color: var(--bad); }

.section { padding: 18px; margin-top: 20px; }
fieldset.item { border: 1px solid var(--line); border-radius: 8px; padding: 4px 14px 14px; margin: 14px 0; min-width: 0; }
fieldset.item legend { font-weight: 700; font-size: 13px; color: var(--ink-soft); padding: 0 6px; }
fieldset.micro { background: var(--paper); }
.item-foot { display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; margin-top: 10px; }
.item-foot label.check { margin: 0; }

.rules-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 700px) { .rules-grid { grid-template-columns: 1fr; } }
.rule-sentence { font: 16px/1.5 var(--serif); border-left: 3px solid var(--ink); padding-left: 12px; margin: 16px 0 8px; }
.rule-summary { margin: 0 0 12px; padding-left: 20px; font-size: 14px; }

.problems { margin-top: 4px; padding: 10px 14px; border-left: 3px solid var(--bad); background: color-mix(in srgb, var(--bad) 8%, transparent); }
.problems ul { margin: 6px 0 0; padding-left: 20px; }
.ok-msg { margin: 4px 0 0; color: var(--good); font-weight: 600; }

/* grading result (candidate page and admin) */
.banner { padding: 20px 22px; margin: 8px 0 16px; border: 1px solid var(--line); border-left: 6px solid var(--ink-soft); border-radius: 10px; background: var(--sheet); }
.banner h1 { font: 500 1.8rem/1.2 var(--serif); margin: 0 0 6px; }
.banner p { margin: 0; color: var(--ink-soft); }
.banner.passed { border-left-color: var(--good); }
.banner.not_passed { border-left-color: var(--bad); }
.banner.held { border-left-color: var(--warn); }
.skill-result { margin-top: 12px; }
.skill-result summary { cursor: pointer; padding: 14px 18px; display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.micro-results { list-style: none; margin: 0; padding: 0 18px 8px; }
.micro-results li { padding: 12px 0; border-top: 1px solid var(--line); }
.micro-results p { margin: 4px 0 0; }
blockquote { margin: 6px 0 0; padding: 2px 12px; border-left: 3px solid var(--line); color: var(--ink-soft); font: 15px/1.5 var(--serif); }
.verdict { font-size: 12px; font-weight: 700; padding: 2px 9px; border-radius: 99px; border: 1px solid currentColor; }
.verdict.yes { color: var(--good); }
.verdict.no { color: var(--bad); }
.runs { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px; margin-top: 8px; }
.run { border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; background: var(--paper); font-size: 14px; }

/* admin: submissions */
.sub-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.sub-table th, .sub-table td { text-align: left; padding: 8px; border-top: 1px solid var(--line); vertical-align: top; }
.pill.passed { color: var(--good); }
.pill.not_passed { color: var(--bad); }
.pill.held { color: var(--warn); }
.answer-text { white-space: pre-wrap; font: 16px/1.6 var(--serif); }
.admin h3 { font: 600 1rem var(--sans); margin: 16px 0 4px; }
.sub-header h1 { margin: 4px 0; }
.sub-header p { margin: 4px 0; }
.result-passed { color: var(--good); }
.result-not_passed { color: var(--bad); }
.result-held { color: var(--warn); }
.gradings { margin: 4px 0 0; padding-left: 20px; }
.gradings li { margin: 6px 0; }
.warning { border-left: 6px solid var(--warn); }
.skills-title { margin: 28px 0 0; }
.run-details { margin-top: 8px; }
.run-details summary { cursor: pointer; font-size: 14px; font-weight: 600; }

.alert { position: fixed; left: 16px; right: 16px; bottom: 16px; max-width: 640px; margin: 0 auto; padding: 12px 16px; border-radius: 8px; background: var(--bad); color: #fff; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }