:root {
  --navy: #0b2d52;
  --navy-2: #0f3a68;
  --ink: #14202b;
  --line: #d7dde4;
  --paper: #f4f6f8;
  --green: #1e7a45;
  --amber: #c98a00;
  --red: #b3261e;
  --blue: #0b5fb1;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

button { font-family: inherit; cursor: pointer; }

/* ---------- top bar ---------- */
.bar {
  background: var(--navy);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  position: sticky;
  top: 0;
  z-index: 30;
  box-shadow: 0 2px 10px rgba(0, 0, 0, .18);
}
.bar__brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.bar__logo {
  width: 34px; height: 34px; border-radius: 8px; flex: 0 0 auto;
  background: #fff; color: var(--navy);
  display: grid; place-items: center;
  font-weight: 800; font-size: 13px; letter-spacing: .5px;
}
.bar__title { font-weight: 700; font-size: 15px; line-height: 1.1; white-space: nowrap; }
.bar__sub { font-size: 11px; opacity: .72; letter-spacing: .4px; text-transform: uppercase; }
.bar__right { display: flex; align-items: center; gap: 14px; flex: 0 0 auto; }
.bar__cand { font-size: 12px; opacity: .85; max-width: 150px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.timer {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 19px;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 8px;
  padding: 5px 12px;
  letter-spacing: .5px;
}
.timer.is-low { background: var(--red); border-color: var(--red); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .55; } }

/* ---------- subject tabs ---------- */
.tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 10px 16px 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  border: 1px solid var(--line);
  border-bottom: none;
  background: #eef1f5;
  color: #46586b;
  font-size: 13px;
  font-weight: 600;
  padding: 9px 15px;
  border-radius: 8px 8px 0 0;
  white-space: nowrap;
}
.tab.is-on { background: var(--navy-2); border-color: var(--navy-2); color: #fff; }
.tab small { display: block; font-weight: 400; font-size: 10px; opacity: .8; }

/* ---------- layout ---------- */
.shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  grid-template-columns: 1fr 208px;
  gap: 16px;
  align-items: start;
}
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; padding: 12px; }
  .palette { order: 2; }
}

/* ---------- question ---------- */
.qcard {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px 24px;
  box-shadow: 0 1px 3px rgba(16, 30, 45, .06);
}
.qhead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
  margin-bottom: 18px;
}
.qnum { font-size: 13px; font-weight: 700; color: var(--navy); letter-spacing: .4px; }
.qmark { font-size: 12px; color: #6a7a8a; }
.qtext { font-size: 17px; line-height: 1.6; margin: 0 0 20px; }
.qtext u { text-decoration-thickness: 1.5px; text-underline-offset: 2px; }

.opts { display: grid; gap: 10px; }
.opt {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  text-align: left;
  width: 100%;
  background: #fbfcfd;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 13px 15px;
  font-size: 15.5px;
  line-height: 1.45;
  color: var(--ink);
  transition: border-color .12s, background .12s, transform .06s;
}
.opt:hover { border-color: #9db3c8; background: #f6f9fc; }
.opt:active { transform: scale(.995); }
.opt__k {
  flex: 0 0 auto;
  width: 27px; height: 27px;
  border-radius: 50%;
  border: 1.5px solid #b9c6d3;
  display: grid; place-items: center;
  font-size: 13px; font-weight: 700; color: #56697c;
  background: #fff;
  margin-top: -1px;
}
.opt.is-picked { border-color: var(--blue); background: #eaf3fd; }
.opt.is-picked .opt__k { background: var(--blue); border-color: var(--blue); color: #fff; }

.opt.is-right { border-color: var(--green); background: #e8f6ee; }
.opt.is-right .opt__k { background: var(--green); border-color: var(--green); color: #fff; }
.opt.is-wrong { border-color: var(--red); background: #fdecea; }
.opt.is-wrong .opt__k { background: var(--red); border-color: var(--red); color: #fff; }

.qnote { margin-top: 16px; font-size: 13.5px; padding: 11px 14px; border-radius: 8px; display: none; }
.qnote.is-on { display: block; }
.qnote.ok { background: #e8f6ee; color: #135c34; border-left: 3px solid var(--green); }
.qnote.no { background: #fdecea; color: #8c1d16; border-left: 3px solid var(--red); }

/* ---------- nav buttons ---------- */
.navrow {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}
.btn {
  border: 1.5px solid var(--line);
  background: #fff;
  color: var(--ink);
  padding: 12px 22px;
  border-radius: 9px;
  font-weight: 600;
  font-size: 15px;
  min-width: 110px;
}
.btn:hover { background: #f2f5f8; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn--primary { background: var(--navy-2); border-color: var(--navy-2); color: #fff; }
.btn--primary:hover { background: #0c4a80; }
.btn--submit { background: var(--green); border-color: var(--green); color: #fff; }
.btn--submit:hover { background: #17633a; }
.btn--flag { background: #fff8e6; border-color: #e8c56a; color: #7a5900; }
.btn--flag.is-on { background: var(--amber); border-color: var(--amber); color: #fff; }

/* ---------- palette ---------- */
.palette {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  position: sticky;
  top: 78px;
  box-shadow: 0 1px 3px rgba(16, 30, 45, .06);
}
.palette h3 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .6px;
  text-transform: uppercase;
  color: #6a7a8a;
  font-weight: 700;
}
.grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.pill {
  aspect-ratio: 1;
  border: 1.5px solid var(--line);
  background: #f4f6f8;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 700;
  color: #46586b;
  display: grid;
  place-items: center;
  padding: 0;
}
.pill.is-done { background: var(--green); border-color: var(--green); color: #fff; }
.pill.is-flag { background: var(--amber); border-color: var(--amber); color: #fff; }
.pill.is-cur { outline: 2.5px solid var(--navy); outline-offset: 1px; }

.legend { margin-top: 14px; display: grid; gap: 7px; font-size: 12px; color: #56697c; }
.legend span { display: flex; align-items: center; gap: 8px; }
.legend i { width: 13px; height: 13px; border-radius: 4px; border: 1.5px solid var(--line); background: #f4f6f8; }
.legend i.d { background: var(--green); border-color: var(--green); }
.legend i.f { background: var(--amber); border-color: var(--amber); }

/* ---------- start / result screens ---------- */
.wrap { max-width: 660px; margin: 0 auto; padding: 26px 16px 60px; }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px 24px;
  box-shadow: 0 2px 8px rgba(16, 30, 45, .07);
}
.card h1 { margin: 0 0 6px; font-size: 24px; color: var(--navy); }
.card h2 { margin: 26px 0 10px; font-size: 16px; color: var(--navy); }
.card p.lead { margin: 0 0 20px; color: #56697c; line-height: 1.55; font-size: 14.5px; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 700; color: #46586b; margin-bottom: 6px; letter-spacing: .2px; }
.field input, .field select {
  width: 100%;
  padding: 12px 13px;
  border: 1.5px solid var(--line);
  border-radius: 9px;
  font-size: 15px;
  font-family: inherit;
  background: #fbfcfd;
  color: var(--ink);
}
.field input:focus, .field select:focus { outline: 2px solid #bcd6f0; border-color: var(--blue); }

.picks { display: grid; gap: 9px; }
.pick {
  display: flex;
  align-items: center;
  gap: 11px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  background: #fbfcfd;
  font-size: 15px;
  cursor: pointer;
  user-select: none;
}
.pick input { width: 18px; height: 18px; accent-color: var(--navy-2); flex: 0 0 auto; }
.pick.is-locked { background: #eef3f8; color: #46586b; cursor: default; }
.pick small { margin-left: auto; font-size: 11.5px; color: #6a7a8a; }

.note {
  margin-top: 18px;
  background: #f2f7fc;
  border-left: 3px solid var(--blue);
  padding: 13px 15px;
  border-radius: 6px;
  font-size: 13.5px;
  line-height: 1.55;
  color: #2b4358;
}

/* ---------- results ---------- */
.score {
  text-align: center;
  padding: 8px 0 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}
.score b { display: block; font-size: 44px; line-height: 1; color: var(--navy); font-variant-numeric: tabular-nums; }
.score span { font-size: 13px; color: #6a7a8a; letter-spacing: .4px; text-transform: uppercase; }

table.res { width: 100%; border-collapse: collapse; font-size: 14.5px; }
table.res th, table.res td { padding: 11px 8px; border-bottom: 1px solid var(--line); text-align: left; }
table.res th { font-size: 11.5px; text-transform: uppercase; letter-spacing: .5px; color: #6a7a8a; }
table.res td.num { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
table.res tr:last-child td { border-bottom: none; font-weight: 700; }

.pill-badge { display: inline-block; font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 20px; }
.pill-badge.g { background: #e8f6ee; color: #135c34; }
.pill-badge.a { background: #fff5e0; color: #7a5900; }
.pill-badge.r { background: #fdecea; color: #8c1d16; }

.hidden { display: none !important; }

.footer-note {
  text-align: center;
  font-size: 11.5px;
  color: #8a99a8;
  padding: 18px 12px 30px;
}