:root {
  --bg: #f4f6fa; --fg: #1a1d24; --muted: #6b7280;
  --primary: #2563eb; --primary-fg: #fff;
  --ok: #16a34a; --fail: #dc2626; --border: #e5e7eb;
}
* { box-sizing: border-box }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.5 -apple-system, "Segoe UI", Roboto, sans-serif; }
.topbar { display: flex; justify-content: space-between; align-items: center;
          padding: 12px 24px; background: #fff; border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
.userbox .user { color: var(--muted); margin-right: 12px; }
button.link { background: none; border: 0; padding: 0; color: var(--primary); cursor: pointer; }
main { max-width: 820px; margin: 32px auto; padding: 0 16px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 24px; }
.center { text-align: center }
.btn { display: inline-block; padding: 10px 20px; border-radius: 8px; border: 1px solid var(--border);
       background: #fff; color: var(--fg); text-decoration: none; cursor: pointer; font: inherit; }
.btn.primary { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }
.bar { display: flex; justify-content: space-between; color: var(--muted); margin-bottom: 12px; }
.timer b { color: var(--fg); font-variant-numeric: tabular-nums; }
.qtext { font-size: 18px; line-height: 1.4; margin: 12px 0 16px; }
.answers { list-style: none; padding: 0; margin: 0 0 24px; }
.answers li { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
              margin-bottom: 8px; cursor: pointer; }
.answers li:hover { background: #f9fafb }
.answers label { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; }
.meta { color: var(--muted); }
.ok { color: var(--ok) } .fail { color: var(--fail) }
.result .qitem { padding: 16px; border-left: 4px solid var(--border);
                 margin-bottom: 16px; background: #fafbfc; border-radius: 6px; }
.result .qitem.ok   { border-left-color: var(--ok) }
.result .qitem.fail { border-left-color: var(--fail) }
.result .qhead { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 8px; }
.result .badge { font-weight: 700; font-size: 18px; }
.result .answers li.correct  { border-color: var(--ok); background: #ecfdf5 }
.result .answers li.selected:not(.correct) { border-color: var(--fail); background: #fef2f2 }

.navlink { color: var(--primary); text-decoration: none; margin-right: 16px; }
.devbanner { background: #fef3c7; color: #78350f; padding: 8px 24px; border-bottom: 1px solid #fde68a;
             font-size: 13px; }
.devbanner a { color: #92400e; margin-left: 12px; }
.stats { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 8px 0 18px; color: var(--muted); }
.stats b { color: var(--fg); }
.admin-actions { display: flex; gap: 12px; align-items: end; margin: -8px 0 16px; }
.admin-actions label { display: flex; flex-direction: column; gap: 4px; color: var(--muted); font-size: 13px; }
.admin-actions select { padding: 9px 10px; border: 1px solid var(--border); border-radius: 6px; font: inherit; background: #fff; }
.filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: end;
           padding: 12px; background: #f9fafb; border-radius: 8px; margin: 12px 0 20px; }
.filters label { display: flex; flex-direction: column; gap: 4px; color: var(--muted); font-size: 13px; }
.filters select, .filters input { padding: 6px 8px; border: 1px solid var(--border);
                                  border-radius: 6px; font: inherit; background: #fff; }
.group-picker { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 20px 0; padding: 0; border: 0; min-width: 0; }
.group-option { display: flex; gap: 10px; align-items: flex-start; padding: 14px; border: 1px solid var(--border); border-radius: 8px; cursor: pointer; }
.group-option:has(input:checked) { border-color: var(--primary); background: #eff6ff; }
.group-option small { display: block; color: var(--muted); margin-top: 2px; }
.exam-rules { padding-left: 20px; color: var(--muted); }
.table-scroll { overflow-x: auto; }
table.grid { width: 100%; border-collapse: collapse; margin-bottom: 24px; font-size: 14px; }
table.grid th, table.grid td { text-align: left; padding: 8px 10px;
                               border-bottom: 1px solid var(--border); white-space: nowrap; }
table.grid td:nth-child(3) { white-space: normal; min-width: 190px; }
table.grid.employee-summary td:first-child { white-space: normal; min-width: 230px; }
table.grid.employee-summary td:nth-child(3) { white-space: nowrap; min-width: auto; }
table.grid th { background: #f9fafb; color: var(--muted); font-weight: 600; }
table.grid tbody tr:hover { background: #fafbfc; }
table.grid tr.row-never td:first-child { font-weight: 600; }
table.grid tr.row-failed { background: #fff7f7; }
table.grid tr.row-expired { background: #fffbeb; }
.warn { color: #b45309 }
main { max-width: 1100px !important; }

@media (max-width: 640px) {
  .topbar { padding: 10px 14px; }
  .stats { flex-wrap: wrap; gap: 8px 14px; }
  .group-picker { grid-template-columns: 1fr; }
  .card { padding: 16px; }
}