:root {
  --bg: #f4f6f9; --card: #ffffff; --text: #1b2430; --muted: #5d6878; --line: #dde2ea;
  --brand: #0b5cad; --brand-ink: #ffffff; --brand-soft: #e7f0fa; --good: #1d7a46; --bad: #b3261e; --warn: #9a6700;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f141a; --card: #171e27; --text: #e6ebf1; --muted: #9aa6b5; --line: #2a3441;
    --brand: #4b9be8; --brand-ink: #08111b; --brand-soft: #1a2a3c; --good: #4cc488; --bad: #f2867f; --warn: #e3b341; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.5 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif; }
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
.wide { max-width: 1100px; }
header.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.brand { font-weight: 700; letter-spacing: .2px; font-size: 18px; }
.brand span { color: var(--brand); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
h1 { font-size: 24px; margin: 0 0 12px; }
h2 { font-size: 18px; margin: 24px 0 8px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
ul.rules { padding-left: 20px; margin: 8px 0 20px; }
ul.rules li { margin: 4px 0; }
button, .btn { font: inherit; border-radius: 8px; border: 1px solid var(--brand); background: var(--brand); color: var(--brand-ink); padding: 10px 18px; cursor: pointer; font-weight: 600; }
button.secondary { background: transparent; color: var(--brand); }
button.small { padding: 4px 10px; font-size: 14px; }
button:disabled { opacity: .5; cursor: not-allowed; }
.progress-row { display: flex; justify-content: space-between; align-items: center; font-size: 14px; color: var(--muted); margin-bottom: 8px; gap: 8px; }
.bar { height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; margin-bottom: 20px; }
.bar > div { height: 100%; background: var(--brand); width: 0; transition: width .3s; }
.timer { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--text); }
.timer.low { color: var(--bad); }
.qtext { font-size: 19px; font-weight: 600; margin: 4px 0 18px; }
.opts { display: grid; gap: 10px; margin-bottom: 20px; }
.opt { text-align: left; background: var(--card); color: var(--text); border: 1.5px solid var(--line); font-weight: 400; padding: 12px 14px; display: flex; gap: 12px; align-items: flex-start; }
.opt .k { flex: none; width: 26px; height: 26px; border-radius: 50%; border: 1.5px solid var(--line); display: inline-flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 600; }
.opt:hover { border-color: var(--brand); }
.opt.sel { border-color: var(--brand); background: var(--brand-soft); }
.opt.sel .k { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.actions { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.err { color: var(--bad); margin-top: 12px; }
.hidden { display: none !important; }
.tag { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 99px; background: var(--brand-soft); color: var(--brand); font-weight: 600; }
/* admin */
form.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; align-items: end; }
label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
input, select { font: inherit; padding: 9px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); width: 100%; }
.linkbox { margin-top: 14px; padding: 12px; border: 1px dashed var(--brand); border-radius: 8px; word-break: break-all; }
.tablewrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.st-assigned { color: var(--brand); } .st-in_progress { color: var(--warn); } .st-completed { color: var(--good); }
.st-expired, .st-revoked { color: var(--muted); }
.good { color: var(--good); } .bad { color: var(--bad); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 12px 0; }
.stat { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.stat b { display: block; font-size: 22px; }
.stat span { font-size: 13px; color: var(--muted); }
.row-actions { display: flex; gap: 6px; flex-wrap: wrap; }

.tabs { display: flex; gap: 6px; margin-bottom: 16px; border-bottom: 1px solid var(--line); }
.tab { background: transparent; color: var(--muted); border: none; border-bottom: 3px solid transparent; border-radius: 0; padding: 10px 14px; }
.tab.on { color: var(--brand); border-bottom-color: var(--brand); }
#tabCandidates > .card, #tabQuestions > .card { margin-bottom: 16px; }
textarea { font: inherit; padding: 9px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); width: 100%; resize: vertical; }
input[type=radio], input[type=checkbox] { width: auto; accent-color: var(--brand); }
.qform { display: grid; gap: 14px; }
.two { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
fieldset { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px 4px; margin: 0; display: grid; gap: 8px; }
legend { font-size: 14px; color: var(--muted); padding: 0 4px; }
.optrow { display: flex; gap: 10px; align-items: center; }
.optrow input[type=radio] { width: 20px; height: 20px; flex: none; }
label.check { display: flex; gap: 8px; align-items: center; color: var(--text); font-size: 15px; }
.small { font-size: 13px; }
button.danger { background: transparent; color: var(--bad); border-color: var(--bad); }
.toolbar { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; align-items: end; margin-bottom: 12px; }
table.grid5 td:not(:first-child), table.grid5 th:not(:first-child) { text-align: center; }
td.low { color: var(--bad); font-weight: 700; }
.qmeta { color: var(--good); font-size: 13px; margin-top: 2px; }

.fill { display: grid; gap: 6px; margin-bottom: 20px; }
.fill input { font-size: 18px; padding: 12px 14px; border-width: 1.5px; }
.fill input:focus { outline: none; border-color: var(--brand); }