:root {
  --primary: #1a5276;
  --primary-dark: #12384f;
  --accent: #2e86c1;
  --bg: #f4f7fa;
  --card: #ffffff;
  --text: #22303c;
  --muted: #6b7b8a;
  --border: #dfe6ec;
  --good: #1e8449;
  --bad: #c0392b;
  --warn: #b9770e;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.wrap { max-width: 900px; margin: 0 auto; padding: 24px 16px 64px; }
.wrap.wide { max-width: 1200px; }

.topbar {
  background: var(--primary);
  color: #fff;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
}
.topbar h1 { font-size: 1.1rem; margin: 0; font-weight: 600; }
.topbar .right { font-size: .9rem; opacity: .95; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 18px;
}

h2 { margin: 0 0 6px; font-size: 1.25rem; }
.sub { color: var(--muted); margin: 0 0 18px; font-size: .92rem; }

label { display: block; font-weight: 600; margin: 12px 0 6px; font-size: .9rem; }
input[type="text"], input[type="number"], input[type="password"], select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
}
input:focus, select:focus { outline: 2px solid var(--accent); border-color: var(--accent); }

.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row > .col { flex: 1 1 160px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}
.btn:hover { background: var(--primary); }
.btn:disabled { background: #9fb3c0; cursor: not-allowed; }
.btn.secondary { background: #eef3f7; color: var(--primary); border: 1px solid var(--border); }
.btn.secondary:hover { background: #e2ebf2; }
.btn.danger { background: var(--bad); }
.btn.block { width: 100%; }
.btn.sm { padding: 7px 12px; font-size: .85rem; }

.hidden { display: none !important; }

.notice { padding: 10px 14px; border-radius: 8px; font-size: .9rem; margin: 10px 0; }
.notice.err { background: #fdecea; color: var(--bad); border: 1px solid #f5c6cb; }
.notice.ok { background: #eafaf1; color: var(--good); border: 1px solid #b7e4c7; }
.notice.warn { background: #fff6e5; color: var(--warn); border: 1px solid #f5d78e; }

/* ---- Quiz taking ---- */
.quiz-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 18px;
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px; flex-wrap: wrap; gap: 8px;
}
.timer {
  font-variant-numeric: tabular-nums;
  font-weight: 700; font-size: 1.3rem;
  padding: 4px 12px; border-radius: 8px;
  background: #eef3f7; color: var(--primary);
}
.timer.low { background: #fdecea; color: var(--bad); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .55; } }
.switch-badge { font-size: .85rem; color: var(--muted); }
.switch-badge b { color: var(--bad); }

.q-block { margin-bottom: 4px; }
.q-num { color: var(--accent); font-weight: 700; font-size: .85rem; letter-spacing: .04em; }
.q-text { font-weight: 600; margin: 4px 0 12px; }
.opt {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; margin-bottom: 8px; cursor: pointer;
  transition: border-color .12s, background .12s;
}
.opt:hover { border-color: var(--accent); background: #f7fbfe; }
.opt input { margin-top: 3px; }
.opt.checked { border-color: var(--accent); background: #eaf4fb; }
.opt .key { font-weight: 700; color: var(--primary); }

.progress-dots { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.dot {
  width: 30px; height: 30px; border-radius: 6px; border: 1px solid var(--border);
  background: #fff; font-size: .8rem; cursor: pointer; color: var(--muted);
}
.dot.answered { background: var(--accent); color: #fff; border-color: var(--accent); }
.dot.current { outline: 2px solid var(--primary); }

/* watermark shown during quiz to discourage screenshots */
.wm { position: fixed; inset: 0; pointer-events: none; z-index: 5;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.4rem; color: rgba(26,82,118,0.05); font-weight: 800;
  transform: rotate(-24deg); user-select: none; }

/* ---- Admin table ---- */
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { padding: 9px 10px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #f0f5f9; color: var(--primary); font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
tr:hover td { background: #f9fbfd; }
.pill { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: .78rem; font-weight: 600; }
.pill.live { background: #fff6e5; color: var(--warn); }
.pill.done { background: #eafaf1; color: var(--good); }
.pill.flag { background: #fdecea; color: var(--bad); }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
.stat { background: #f6f9fb; border: 1px solid var(--border); border-radius: 10px; padding: 14px; }
.stat .n { font-size: 1.7rem; font-weight: 700; color: var(--primary); }
.stat .l { font-size: .8rem; color: var(--muted); }

.muted { color: var(--muted); }
.mono { font-family: ui-monospace, "Cascadia Code", monospace; }
.right-align { text-align: right; }
.no-select { user-select: none; -webkit-user-select: none; }