/* TidalExam — plain CSS, no frameworks. One accent colour; light/dark follows the OS. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #1b2130;
  --muted: #5a6376;
  --border: #dde1e8;
  --accent: #0f766e;
  --accent-hover: #0b5f58;
  --accent-contrast: #ffffff;
  --accent-soft: #e3f4f2;

  --ok: #166534;
  --ok-bg: #dcfce7;
  --warn: #92400e;
  --warn-bg: #fef3c7;
  --danger: #b91c1c;
  --danger-bg: #fee2e2;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131a;
    --surface: #171c26;
    --surface-2: #1d2330;
    --text: #e6e9ef;
    --muted: #9aa4b5;
    --border: #2a3140;
    --accent: #2dd4bf;
    --accent-hover: #5eead4;
    --accent-contrast: #04201c;
    --accent-soft: #123532;

    --ok: #86efac;
    --ok-bg: #12301f;
    --warn: #fcd34d;
    --warn-bg: #3a2c0b;
    --danger: #fca5a5;
    --danger-bg: #3d1717;

    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
}

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5em; font-weight: 650; }
h1 { font-size: 1.65rem; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1.02rem; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-hover); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
code, pre { font-family: var(--mono); font-size: 0.9em; }
.muted { color: var(--muted); }
.mt { margin-top: 1.25rem; }
.small { font-size: 0.875rem; }
.nowrap { white-space: nowrap; }
.right { text-align: right; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ---------- layout ---------- */

.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 1rem; }
.container.narrow { max-width: 46rem; }

.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.site-header .container { display: flex; align-items: center; gap: 1.25rem; min-height: 3.5rem; flex-wrap: wrap; }
.brand { font-weight: 700; letter-spacing: 0.01em; color: var(--text); text-decoration: none; }
.brand::before { content: ""; display: inline-block; width: 0.7em; height: 0.7em; margin-right: 0.5em; border-radius: 50%; background: var(--accent); }

.nav { display: flex; gap: 0.25rem; flex: 1; flex-wrap: wrap; }
.nav a {
  padding: 0.35rem 0.7rem; border-radius: 6px; color: var(--muted);
  text-decoration: none; font-size: 0.95rem;
}
.nav a:hover { background: var(--surface-2); color: var(--text); }
.nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.nav-end { margin-left: auto; display: flex; gap: 0.25rem; flex-wrap: wrap; }

main { padding: 1.75rem 0 3rem; }
.site-footer { padding: 1.5rem 0 2.5rem; color: var(--muted); font-size: 0.85rem; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 1.5rem; margin-bottom: 1.25rem;
}
.card > :last-child { margin-bottom: 0; }

.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.page-head h1 { margin: 0; }
.lead { font-size: 1.1rem; color: var(--muted); }

/* ---------- buttons & forms ---------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  min-height: 2.6rem; padding: 0.5rem 1.15rem; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--surface-2); color: var(--text); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-contrast); }
.btn-small { min-height: 2rem; padding: 0.2rem 0.7rem; font-size: 0.875rem; }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-bg); color: var(--danger); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; }
.btn-link { background: none; border: 0; color: var(--muted); padding: 0.35rem 0.7rem; font: inherit; cursor: pointer; border-radius: 6px; }
.btn-link:hover { background: var(--surface-2); color: var(--text); }

.field { margin-bottom: 1.1rem; }
.field > label:not(.checkbox), .field > .label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
.hint { color: var(--muted); font-size: 0.875rem; margin-top: 0.25rem; }
input[type="text"], input[type="email"], input[type="password"], input[type="number"], select, textarea {
  width: 100%; padding: 0.55rem 0.7rem; font: inherit; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
}
textarea { min-height: 11rem; resize: vertical; font-family: var(--mono); font-size: 0.9rem; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline-offset: 0; border-color: var(--accent); }
.field-error, .validation-summary { color: var(--danger); font-size: 0.9rem; margin-top: 0.25rem; }
.checkbox { display: flex; gap: 0.7rem; align-items: flex-start; }
.checkbox input { margin-top: 0.3rem; width: 1.1rem; height: 1.1rem; accent-color: var(--accent); flex: none; }
.checkbox .hint { display: block; }

.filters { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: flex-end; }
.filters .field { margin: 0; min-width: 10rem; }

.alert { border-radius: 8px; padding: 0.8rem 1rem; margin-bottom: 1rem; border: 1px solid transparent; }
.alert-error { background: var(--danger-bg); color: var(--danger); border-color: var(--danger); }
.alert-warn { background: var(--warn-bg); color: var(--warn); border-color: var(--warn); }
.alert-ok { background: var(--ok-bg); color: var(--ok); border-color: var(--ok); }

/* ---------- badges ---------- */

.badge {
  display: inline-block; padding: 0.1rem 0.6rem; border-radius: 999px; font-size: 0.8rem;
  font-weight: 600; line-height: 1.5; background: var(--surface-2); color: var(--muted); white-space: nowrap;
}
.badge-clean, .badge-completed { background: var(--ok-bg); color: var(--ok); }
.badge-review, .badge-inprogress { background: var(--warn-bg); color: var(--warn); }
.badge-high { background: var(--danger-bg); color: var(--danger); }
.badge-invited { background: var(--accent-soft); color: var(--accent); }
.badge-expired { background: var(--surface-2); color: var(--muted); }

/* ---------- tables ---------- */

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table.data { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
table.data th, table.data td { padding: 0.6rem 0.8rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
table.data th { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); background: var(--surface-2); white-space: nowrap; }
table.data tbody tr:last-child td { border-bottom: 0; }
table.data td.num, table.data th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.data tr.detail-row td { background: var(--surface-2); }
.empty { padding: 2rem 1rem; text-align: center; color: var(--muted); }

.flag { font-weight: 700; color: var(--danger); }
.flag-zero { color: var(--muted); font-weight: 400; }

/* ---------- stat tiles ---------- */

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); gap: 0.75rem; margin-bottom: 1.25rem; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.9rem 1rem; }
.stat .label { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.stat .value { font-size: 1.6rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat-alert { border-color: var(--danger); background: var(--danger-bg); }
.stat-alert .value, .stat-alert .label { color: var(--danger); }

dl.facts { display: grid; grid-template-columns: max-content 1fr; gap: 0.35rem 1.25rem; margin: 0; }
dl.facts dt { color: var(--muted); }
dl.facts dd { margin: 0; overflow-wrap: anywhere; }

.copy-cell { display: flex; gap: 0.5rem; align-items: center; }
.copy-cell input { font-family: var(--mono); font-size: 0.8rem; min-width: 14rem; }

/* ---------- candidate: rules, exam ---------- */

.rules { padding-left: 1.2rem; margin: 0 0 1.25rem; }
.rules li { margin-bottom: 0.4rem; }

.exam-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 0.6rem; }
.exam-head .position { font-weight: 650; }
.countdown {
  font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.35rem;
  padding: 0.15rem 0.8rem; border-radius: 8px; background: var(--surface-2); color: var(--text);
  min-width: 5.2rem; text-align: center;
}
.countdown.warning { background: var(--danger-bg); color: var(--danger); }

progress.exam-progress {
  width: 100%; height: 0.45rem; margin-bottom: 1.25rem; border: 0; border-radius: 999px;
  background: var(--surface-2); accent-color: var(--accent); appearance: none;
}
progress.exam-progress::-webkit-progress-bar { background: var(--surface-2); border-radius: 999px; }
progress.exam-progress::-webkit-progress-value { background: var(--accent); border-radius: 999px; }
progress.exam-progress::-moz-progress-bar { background: var(--accent); border-radius: 999px; }

.prompt { font-size: 1.1rem; font-weight: 550; white-space: pre-wrap; margin-bottom: 1rem; }

pre.code {
  margin: 0 0 1.25rem; padding: 1rem; overflow-x: auto; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--border); line-height: 1.5; tab-size: 4;
}
pre.code code { font-size: 0.88rem; white-space: pre; }

/* Questions must not be selectable or copyable from the page. */
.no-select, .no-select * {
  -webkit-user-select: none; user-select: none; -webkit-touch-callout: none;
}

fieldset.options { border: 0; margin: 0 0 1.25rem; padding: 0; display: grid; gap: 0.6rem; }
.option {
  display: flex; gap: 0.8rem; align-items: flex-start; padding: 0.75rem 0.9rem; cursor: pointer;
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
}
.option:hover { border-color: var(--accent); }
.option input { margin-top: 0.25rem; width: 1.05rem; height: 1.05rem; accent-color: var(--accent); flex: none; }
.option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.option-text { white-space: pre-wrap; overflow-wrap: anywhere; }

.exam-actions { display: flex; justify-content: flex-end; }

/* The answers are hidden in the markup until the exam script has started (see exam.js): [hidden] must beat the rules above. */
[hidden] { display: none !important; }

/* Appears only if the script has not removed it after 3 seconds (blocked, or failed to load). No flash on a normal load. */
.pending-notice { opacity: 0; animation: show-late 0s linear 3s forwards; }
@keyframes show-late { to { opacity: 1; } }

.center-card { text-align: center; padding: 2.5rem 1.5rem; }
.center-card h1 { margin-bottom: 0.6rem; }

/* ---------- details / admin question view ---------- */

details.q > summary { cursor: pointer; color: var(--accent); font-weight: 600; }
details.q[open] > summary { margin-bottom: 0.6rem; }
ul.option-list { margin: 0 0 0.6rem; padding-left: 1.2rem; }
ul.option-list li { margin-bottom: 0.2rem; }
li.is-correct { color: var(--ok); font-weight: 600; }
li.is-wrong-pick { color: var(--danger); font-weight: 600; }
.explanation { border-left: 3px solid var(--accent); padding-left: 0.8rem; color: var(--muted); }

/* ---------- positions, screening, notices ---------- */

.position-title { font-weight: 600; color: var(--accent); margin: -0.2rem 0 0.8rem; }
.position-name { font-size: 1rem; font-weight: 500; margin-left: 0.4rem; }
.exam-role { margin: -0.6rem 0 1rem; font-size: 0.875rem; color: var(--muted); }
fieldset.choice { border: 0; padding: 0; margin: 0 0 1.1rem; }
fieldset.choice > legend { font-weight: 600; padding: 0; margin-bottom: 0.3rem; }
fieldset.choice .checkbox { margin-top: 0.4rem; }

.notice {
  border-radius: 8px; padding: 0.7rem 1rem; margin: 0 0 1rem; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text);
}
.notice-warn { background: var(--warn-bg); color: var(--warn); border-color: var(--warn); }
.summary { color: var(--muted); }
.reference { word-break: break-all; }

.badge-flag { background: var(--warn-bg); color: var(--warn); margin: 0 0.25rem 0.2rem 0; }
.badge-screenedout { background: var(--danger-bg); color: var(--danger); }

.position-switch { display: flex; align-items: center; gap: 0.4rem; margin: 0; }
.position-switch select { width: auto; max-width: 18rem; padding: 0.3rem 0.5rem; font-size: 0.9rem; }

/* ---------- emails, bulk actions ---------- */

.badge-pending, .badge-sending { background: var(--warn-bg); color: var(--warn); }
.badge-sent { background: var(--ok-bg); color: var(--ok); }
.badge-failed { background: var(--danger-bg); color: var(--danger); }
.badge-cancelled { background: var(--surface-2); color: var(--muted); }

.bulk-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; margin-bottom: 0.9rem; }
.bulk-bar form { margin: 0; }
.inline-form { display: inline; margin: 0; }
.actions { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.error-text { color: var(--danger); overflow-wrap: anywhere; margin-top: 0.2rem; }
pre.message-text { white-space: pre-wrap; overflow-wrap: anywhere; font-family: var(--font); font-size: 0.9rem; }
table.data th.select, table.data td.select { width: 2rem; padding-right: 0; }
table.data td.select input { width: 1.05rem; height: 1.05rem; accent-color: var(--accent); }

/* ---------- statistics: charts drawn as inline SVG (colours come from the theme variables, never from style attributes) ---------- */

.chart-row { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: flex-start; margin-bottom: 0.5rem; }
.chart-wrap { flex: 1 1 36rem; max-width: 760px; min-width: 0; overflow-x: auto; }
.chart-side { flex: 1 1 14rem; min-width: 0; align-self: center; margin: 0; }
svg.chart { display: block; width: 100%; height: auto; min-width: 34rem; }
svg.chart text { fill: var(--text); font-family: var(--font); font-size: 14px; }
svg.chart .chart-value, svg.chart .chart-count { font-weight: 700; }
svg.chart .chart-count { font-size: 12px; }
svg.chart .chart-muted { fill: var(--muted); font-size: 12px; }
svg.chart .chart-label-pass { fill: var(--warn); font-weight: 600; font-size: 13px; }
svg.chart .chart-label-median { font-weight: 600; font-size: 13px; }
svg.chart .chart-grid { stroke: var(--border); stroke-width: 1; }
svg.chart .chart-axis { stroke: var(--muted); stroke-width: 1; }
svg.chart .chart-track { fill: var(--surface-2); }
svg.chart .chart-bar { fill: var(--accent); }
svg.chart .chart-bar-ok { fill: var(--ok); }
svg.chart .chart-bar-warn { fill: var(--warn); }
svg.chart .chart-bar-danger { fill: var(--danger); }
svg.chart .chart-bar-muted { fill: var(--muted); opacity: 0.55; }
svg.chart .chart-line-median { stroke: var(--text); stroke-width: 2; }
svg.chart .chart-line-pass { stroke: var(--warn); stroke-width: 2; stroke-dasharray: 6 4; }

@media (max-width: 640px) {
  main { padding-top: 1.1rem; }
  .card { padding: 1.1rem; }
  h1 { font-size: 1.4rem; }
  .exam-head { flex-wrap: wrap; }
  .countdown { font-size: 1.15rem; }
  dl.facts { grid-template-columns: 1fr; gap: 0; }
  dl.facts dt { margin-top: 0.5rem; }
}

@media (prefers-reduced-motion: no-preference) {
  .btn, .option, .nav a { transition: background-color 0.12s ease, border-color 0.12s ease; }
}

@media print {
  .site-header, .nav, .site-footer, .btn { display: none !important; }
  body { background: #fff; color: #000; }
}