:root {
  --paper: #EAF0EB;
  --sheet: #FFFFFF;
  --ink: #1D2B33;
  --muted: #56666C;
  --line: #C9D4CD;
  --gum: #3E7C6B;
  --gum-ink: #FFFFFF;
  --wattle: #E2B007;
  --ok: #23804F;
  --ok-bg: #E2F3E9;
  --bad: #B3372B;
  --bad-bg: #F8E4E1;
  --p0: #2D5DA8;
  --p1: #8E3B8A;
  --mark: #FCEBA6;
  --radius: 10px;
  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --text: "Atkinson Hyperlegible", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #142026; --sheet: #1C2A31; --ink: #E7EEEA; --muted: #9DB0B3; --line: #31444C;
    --gum: #5FA88F; --gum-ink: #0E1A16; --ok: #5CC78E; --ok-bg: #173327; --bad: #F08578; --bad-bg: #3A1F1C;
    --p0: #7EA6EC; --p1: #D488CF; --mark: #5C4A08; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #142026; --sheet: #1C2A31; --ink: #E7EEEA; --muted: #9DB0B3; --line: #31444C;
  --gum: #5FA88F; --gum-ink: #0E1A16; --ok: #5CC78E; --ok-bg: #173327; --bad: #F08578; --bad-bg: #3A1F1C;
  --p0: #7EA6EC; --p1: #D488CF; --mark: #5C4A08; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 17px/1.5 var(--text);
}
main { max-width: 760px; margin: 0 auto; padding: 20px 16px 64px; }
h1, h2, h3 { font-family: var(--display); line-height: 1.15; margin: 0; }
h1 { font-size: 30px; font-weight: 800; letter-spacing: -0.01em; }
h2 { font-size: 21px; font-weight: 700; margin: 34px 0 12px; }
h3 { font-size: 17px; font-weight: 700; }
p { margin: 0 0 12px; }
a { color: var(--gum); }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.boot { color: var(--muted); }

button, .btn {
  font: inherit; font-weight: 700; cursor: pointer; border-radius: var(--radius);
  border: 2px solid var(--gum); background: var(--gum); color: var(--gum-ink);
  padding: 11px 18px; min-height: 46px;
}
button.ghost { background: transparent; color: var(--gum); }
button.link { background: none; border: 0; color: var(--gum); padding: 4px 0; min-height: 0; text-decoration: underline; font-weight: 700; }
button:disabled { opacity: .45; cursor: default; }
button:focus-visible, input:focus-visible, .opt:focus-visible { outline: 3px solid var(--wattle); outline-offset: 2px; }
input {
  font: inherit; width: 100%; padding: 12px 14px; border-radius: var(--radius);
  border: 2px solid var(--line); background: var(--sheet); color: var(--ink);
}
label { display: block; font-weight: 700; margin-bottom: 6px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.spread { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.sheet { background: var(--sheet); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.err { color: var(--bad); font-weight: 700; }

/* Header */
.top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; gap: 12px; }
.brand { font-family: var(--display); font-weight: 800; font-size: 19px; text-decoration: none; color: var(--ink); }
.brand b { color: var(--gum); }

/* Login */
.login { max-width: 420px; margin: 9vh auto 0; }
.login h1 { font-size: 40px; margin-bottom: 10px; }
.login form { margin-top: 26px; display: grid; gap: 14px; }

/* The booklet map: one tile per booklet page */
.map { display: grid; gap: 14px; }
.map-row { display: grid; grid-template-columns: 74px 1fr; gap: 10px; align-items: center; }
.map-who { font-weight: 700; font-size: 15px; display: flex; align-items: center; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.pages { display: flex; gap: 3px; align-items: flex-end; }
.part-gap { width: 7px; flex: none; }
.pg {
  flex: 1 1 0; min-width: 0; height: 40px; border-radius: 2px 6px 2px 2px;
  background: var(--c, #ccc); position: relative;
}
.pg::after { /* folded corner, like a page */
  content: ""; position: absolute; top: 0; right: 0; width: 7px; height: 7px;
  background: linear-gradient(225deg, var(--paper) 50%, rgba(0,0,0,.18) 50%);
  border-radius: 0 6px 0 0;
}
.map-axis { display: grid; grid-template-columns: 74px 1fr; gap: 10px; font-size: 13px; color: var(--muted); }
.map-axis .pages { align-items: center; }
.map-axis span { flex: var(--n) 1 0; text-align: center; }
.legend { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); margin-top: 6px; }
.legend i { display: inline-block; width: 120px; height: 8px; border-radius: 4px;
  background: linear-gradient(90deg, hsl(5 62% 48%), hsl(42 85% 50%), hsl(140 50% 38%)); }

/* Big numbers per person */
.scores { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 18px; }
.score { border-left: 5px solid var(--who); padding: 4px 0 4px 14px; }
.score .num { font-family: var(--display); font-size: 44px; font-weight: 800; line-height: 1; }
.score .num small { font-size: 18px; font-weight: 700; color: var(--muted); margin-left: 6px; }

/* Chapters */
.chapters { display: grid; gap: 10px; }
.chapter { display: grid; grid-template-columns: 1fr auto; gap: 8px 14px; align-items: center; }
.chapter h3 { margin-bottom: 4px; }
.bars { display: grid; gap: 5px; margin-top: 6px; }
.bar { display: grid; grid-template-columns: 70px 1fr 112px; gap: 8px; align-items: center; font-size: 13px; }
.track { height: 9px; background: var(--paper); border-radius: 5px; position: relative; overflow: hidden; }
.track .seen { position: absolute; inset: 0 auto 0 0; background: var(--who); opacity: .28; }
.track .mastered { position: absolute; inset: 0 auto 0 0; background: var(--who); }

/* Quiz */
.qhead { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 14px; font-size: 15px; color: var(--muted); }
.timer { font-family: var(--display); font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }
.timer.low { color: var(--bad); }
.question { font-family: var(--text); font-size: 22px; line-height: 1.35; font-weight: 700; margin: 0 0 18px; }
.vtag { display: inline-block; font-size: 13px; font-weight: 700; color: var(--ink); background: var(--mark); border-radius: 4px; padding: 1px 8px; margin-bottom: 10px; }
.opts { display: grid; gap: 10px; }
.opt {
  display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%;
  background: var(--sheet); color: var(--ink); border: 2px solid var(--line); font-weight: 400;
  padding: 13px 14px; border-radius: var(--radius);
}
.opt .k { flex: none; width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--line); display: grid; place-items: center; font-size: 13px; font-weight: 700; color: var(--muted); }
.opt:not(:disabled):hover { border-color: var(--gum); }
.opt.picked { border-color: var(--gum); background: color-mix(in srgb, var(--gum) 10%, var(--sheet)); }
.opt.picked .k { background: var(--gum); border-color: var(--gum); color: var(--gum-ink); }
.opt.right { border-color: var(--ok); background: var(--ok-bg); }
.opt.right .k { background: var(--ok); border-color: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt.wrong .k { background: var(--bad); border-color: var(--bad); color: #fff; }
.opt:disabled { cursor: default; opacity: 1; }
.feedback { margin-top: 16px; padding: 14px 16px; border-radius: var(--radius); border-left: 5px solid var(--ok); background: var(--sheet); }
.feedback.no { border-left-color: var(--bad); }
.feedback strong { display: block; margin-bottom: 4px; }
.actions { display: flex; justify-content: space-between; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

/* Help: the booklet page */
.booklet { margin-top: 16px; background: var(--sheet); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; font-size: 15.5px; }
.booklet .spread { margin-bottom: 8px; }
.booklet p { max-width: 68ch; }
.booklet p.hit { border-left: 4px solid var(--wattle); padding-left: 12px; margin-left: -16px; }
.booklet mark { background: var(--mark); color: inherit; padding: 0 2px; border-radius: 2px; }
.booklet .src { font-size: 12.5px; color: var(--muted); margin-top: 10px; }

/* Mock exam grid */
.grid20 { display: grid; grid-template-columns: repeat(10, 1fr); gap: 5px; margin: 16px 0 0; }
.grid20 button { min-height: 34px; padding: 0; font-size: 13px; background: var(--sheet); color: var(--ink); border: 2px solid var(--line); }
.grid20 button.done { background: color-mix(in srgb, var(--gum) 18%, var(--sheet)); border-color: var(--gum); }
.grid20 button.here { outline: 3px solid var(--wattle); outline-offset: 1px; }

/* Results */
.verdict { font-family: var(--display); font-size: 38px; font-weight: 800; }
.verdict.pass { color: var(--ok); }
.verdict.fail { color: var(--bad); }
.review { display: grid; gap: 12px; margin-top: 12px; }
.review .item { border-left: 5px solid var(--ok); }
.review .item.no { border-left-color: var(--bad); }
.review .q { font-weight: 700; margin-bottom: 6px; }

table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 700; color: var(--muted); font-size: 13px; }
td.num { font-variant-numeric: tabular-nums; }
.win { font-weight: 700; }
.pill { display: inline-block; font-size: 12.5px; font-weight: 700; padding: 1px 8px; border-radius: 10px; }
.pill.ok { background: var(--ok-bg); color: var(--ok); }
.pill.no { background: var(--bad-bg); color: var(--bad); }

.choose { display: grid; gap: 10px; margin-top: 14px; }
.seg { display: inline-flex; border: 2px solid var(--gum); border-radius: var(--radius); overflow: hidden; }
.seg button { border: 0; border-radius: 0; background: transparent; color: var(--gum); min-height: 40px; padding: 6px 14px; }
.seg button[aria-pressed="true"] { background: var(--gum); color: var(--gum-ink); }

td:first-child { white-space: nowrap; }
@media (max-width: 520px) {
  .hello { display: none; }
  h1 { font-size: 26px; }
  .map-row { grid-template-columns: 1fr; gap: 4px; }
  .map-axis { grid-template-columns: 1fr; }
  .map-axis > span:first-child { display: none; }
  .question { font-size: 20px; }
  .pg { height: 34px; }
  .pages { gap: 2px; }
  .part-gap { width: 4px; }
  .bar { grid-template-columns: 56px 1fr 96px; }
  .grid20 { grid-template-columns: repeat(5, 1fr); }
  .score .num { font-size: 38px; }
}
@media (prefers-reduced-motion: no-preference) {
  .opt { transition: border-color .12s, background-color .12s; }
}