:root {
  --bg: #f6f4ee; --card: #ffffff; --ink: #1b2233; --muted: #5d6677; --line: #e2dfd6;
  --accent: #27357e; --accent-ink: #ffffff; --accent-soft: #e9ecfa; --saffron: #d97a12;
  --ok: #17794a; --ok-soft: #e3f4ea; --bad: #b3261e; --bad-soft: #fbe9e7; --skip: #8a6d1a; --skip-soft: #f8f0d8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151d; --card: #1b202b; --ink: #eceef4; --muted: #a0a8b8; --line: #2e3442;
    --accent: #8f9df0; --accent-ink: #10142a; --accent-soft: #262d4d; --saffron: #f0a24a;
    --ok: #5fd39a; --ok-soft: #173326; --bad: #ff8a80; --bad-soft: #3a1d1b; --skip: #e2c56a; --skip-soft: #352e17;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Devanagari", sans-serif; }
[hidden] { display: none !important; }
button { font: inherit; color: inherit; cursor: pointer; }
main { max-width: 720px; margin: 0 auto; padding: 8px 16px 40px; }
.top { max-width: 720px; margin: 0 auto; padding: 14px 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand svg rect { fill: var(--accent); } .brand svg path { stroke: var(--accent-ink); }
.brand b { display: block; font-size: 17px; line-height: 1.15; letter-spacing: -.01em; }
.brand i { display: block; font-style: normal; font-size: 13px; color: var(--muted); line-height: 1.2; }
.top-note { font-size: 13px; color: var(--muted); text-align: right; }
h1 { font-size: clamp(24px, 6vw, 32px); line-height: 1.15; letter-spacing: -.02em; margin: 14px 0 8px; text-wrap: balance; }
h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin: 0 0 10px; font-weight: 650; }
.lead { color: var(--muted); margin: 0 0 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; margin-bottom: 14px; }
.field { margin-bottom: 20px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1.5px solid var(--line); background: transparent; border-radius: 999px; padding: 9px 16px; min-height: 44px; font-weight: 550; display: inline-flex; align-items: center; gap: 8px; }
.chip:hover:not(:disabled) { border-color: var(--accent); }
.chip.on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.chip:disabled { cursor: not-allowed; color: var(--muted); border-style: dashed; }
.chip small { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--saffron); }
.chip .n { font-size: 12px; font-weight: 500; opacity: .75; }
.chips.small .chip { min-height: 34px; padding: 4px 12px; font-size: 14px; }
.hint { font-size: 14px; color: var(--muted); margin: 8px 0 0; min-height: 1.5em; }
.error { color: var(--bad); font-size: 14px; margin: 10px 0 0; }
.primary, .submit, .ghost { border-radius: 12px; min-height: 48px; padding: 10px 20px; font-weight: 650; border: 1.5px solid transparent; }
.primary { background: var(--accent); color: var(--accent-ink); width: 100%; }
.primary:disabled { opacity: .45; cursor: not-allowed; }
.ghost { background: transparent; border-color: var(--line); }
.ghost:disabled { opacity: .4; cursor: not-allowed; }
.submit { background: var(--saffron); color: #fff; }
@media (prefers-color-scheme: dark) { .submit { color: #1b1204; } }
:focus-visible { outline: 3px solid var(--saffron); outline-offset: 2px; }

.test-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin: 6px 0 10px; font-size: 14px; }
.tag { background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 4px 12px; font-weight: 650; margin-right: 10px; }
.count { font-weight: 650; font-variant-numeric: tabular-nums; }
.answered { color: var(--muted); font-variant-numeric: tabular-nums; }
.bar { height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; margin-bottom: 14px; }
.bar i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 99px; transition: width .2s; }
.qtext { font-size: 19px; line-height: 1.45; margin: 2px 0 18px; font-weight: 550; overflow-wrap: anywhere; }
.options { display: grid; gap: 10px; }
.opt { display: flex; align-items: center; gap: 12px; text-align: left; width: 100%; border: 1.5px solid var(--line); background: transparent; border-radius: 12px; padding: 12px 14px; min-height: 52px; font-size: 17px; overflow-wrap: anywhere; }
.opt:hover { border-color: var(--accent); }
.opt .k { flex: none; width: 28px; height: 28px; border-radius: 50%; border: 1.5px solid var(--line); display: grid; place-items: center; font-size: 13px; font-weight: 700; color: var(--muted); }
.opt.on { border-color: var(--accent); background: var(--accent-soft); }
.opt.on .k { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.nav { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 14px; }
.palette { display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); gap: 8px; }
.pal { height: 42px; border-radius: 10px; border: 1.5px solid var(--line); background: transparent; font-weight: 600; font-variant-numeric: tabular-nums; }
.pal.done { background: var(--accent-soft); border-color: var(--accent-soft); color: var(--accent); }
.pal.cur { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.submit-row { margin-top: 16px; }
.submit-row > .submit { width: 100%; }
.confirm { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.confirm p { grid-column: 1 / -1; margin: 0; font-weight: 550; }

.score-card { display: flex; align-items: center; gap: 18px; }
.score-card h1 { margin: 0 0 4px; font-size: clamp(22px, 5.5vw, 28px); }
.score-card .lead { margin: 0 0 10px; }
.ring { --p: 0; flex: none; width: 104px; height: 104px; border-radius: 50%; display: grid; place-items: center;
  background: radial-gradient(closest-side, var(--card) 78%, transparent 79%), conic-gradient(var(--accent) calc(var(--p) * 1%), var(--line) 0); }
.ring b { font-size: 26px; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.stats { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; font-weight: 650; }
.stats span { border-radius: 999px; padding: 3px 10px; }
.s-ok { background: var(--ok-soft); color: var(--ok); } .s-bad { background: var(--bad-soft); color: var(--bad); } .s-skip { background: var(--skip-soft); color: var(--skip); }

.pred-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 12px; }
.pred-box { border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.pred-box .lbl { font-size: 13px; color: var(--muted); }
.pred-box .val { font-size: 26px; font-weight: 700; letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1.2; }
.pred-box .val small { font-size: 14px; font-weight: 550; color: var(--muted); }
.pred-box .rng { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.outlook { border-radius: 12px; padding: 10px 12px; font-weight: 600; margin-bottom: 10px; }
.outlook.strong, .outlook.on_track { background: var(--ok-soft); color: var(--ok); }
.outlook.borderline { background: var(--skip-soft); color: var(--skip); }
.outlook.at_risk { background: var(--bad-soft); color: var(--bad); }
.notes { margin: 0; padding-left: 18px; font-size: 13.5px; color: var(--muted); }
.notes li { margin-bottom: 3px; }

.ch { margin-bottom: 14px; } .ch:last-child { margin-bottom: 0; }
.ch-top { display: flex; justify-content: space-between; gap: 12px; font-size: 15px; margin-bottom: 5px; }
.ch-top b { font-weight: 550; } .ch-top span { flex: none; color: var(--muted); font-variant-numeric: tabular-nums; }
.ch .bar { margin: 0; height: 8px; }
.ch .bar i.low { background: var(--bad); } .ch .bar i.mid { background: var(--saffron); } .ch .bar i.high { background: var(--ok); }

.review-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.review-head h2 { margin: 0; }
.rv { border-top: 1px solid var(--line); padding: 14px 0; } .rv:first-child { border-top: 0; padding-top: 0; }
.rv-meta { font-size: 12.5px; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 4px; }
.badge { border-radius: 999px; padding: 1px 9px; font-weight: 650; }
.badge.ok { background: var(--ok-soft); color: var(--ok); } .badge.bad { background: var(--bad-soft); color: var(--bad); } .badge.skip { background: var(--skip-soft); color: var(--skip); }
.rv-q { font-weight: 550; margin: 0 0 8px; overflow-wrap: anywhere; }
.rv-o { display: flex; gap: 8px; padding: 5px 10px; border-radius: 8px; font-size: 15px; overflow-wrap: anywhere; }
.rv-o .k { font-weight: 700; color: var(--muted); flex: none; }
.rv-o.right { background: var(--ok-soft); color: var(--ok); font-weight: 600; } .rv-o.right .k { color: inherit; }
.rv-o.wrong { background: var(--bad-soft); color: var(--bad); text-decoration: line-through; text-decoration-thickness: 1px; } .rv-o.wrong .k { color: inherit; }

/* maths notation */
sup, sub { font-size: .72em; line-height: 0; }
.mx { display: inline-table; vertical-align: middle; border-left: 1.5px solid currentColor; border-right: 1.5px solid currentColor; border-radius: 5px; padding: 0 3px; margin: 2px 3px; line-height: 1.3; }
.mr { display: table-row; } .mr > span { display: table-cell; padding: 1px 7px; text-align: center; }

footer { max-width: 720px; margin: 0 auto; padding: 0 16px 28px; font-size: 13px; color: var(--muted); }
footer a { color: inherit; }
@media (max-width: 420px) { .score-card { flex-direction: column; text-align: center; } .stats { justify-content: center; } .pred-grid { grid-template-columns: 1fr; } }