:root {
  --ink: #241A5C;
  --ink2: #5F5798;
  --bg: #F3F0FF;
  --line: #DCD5FA;
  --sun: #FFC233;
  --mint: #1FCB9E;
  --coral: #FF5C7A;
  --sky: #5AB8FF;
}
* { box-sizing: border-box; margin: 0; }
html { color-scheme: light; }
body {
  font: 600 16px/1.45 Nunito, system-ui, sans-serif;
  color: var(--ink);
  background-color: var(--bg);
  background-image: radial-gradient(circle at 1px 1px, #D6CDF8 1.6px, transparent 0);
  background-size: 22px 22px;
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
}
body.noscroll { overflow: hidden; }
h1, h2, h3, .display { font-family: 'Baloo 2', Nunito, sans-serif; font-weight: 800; line-height: 1.12; }
h1 { font-size: 30px; }
h2 { font-size: 22px; }
h3 { font-size: 19px; }
.muted { color: var(--ink2); font-weight: 600; }
.small { font-size: 14px; }
.wrap { max-width: 520px; margin: 0 auto; padding: 18px 16px 48px; }
.wrap.wide { max-width: 760px; }
.center { text-align: center; }
.row { display: flex; align-items: center; gap: 10px; }
.row.between { justify-content: space-between; }
.row.wrap-r { flex-wrap: wrap; }
.grow { flex: 1; min-width: 0; }
.stack > * + * { margin-top: 12px; }
:focus-visible { outline: 3px solid var(--sky); outline-offset: 2px; }

/* ---------- Cards, buttons, inputs ---------- */
.card {
  background: #fff;
  border: 2.5px solid var(--ink);
  border-radius: 22px;
  box-shadow: 0 5px 0 var(--ink);
  padding: 18px;
  margin-bottom: 18px;
}
.btn {
  font: 800 17px 'Baloo 2', Nunito, sans-serif;
  background: var(--sun);
  color: var(--ink);
  border: 2.5px solid var(--ink);
  border-radius: 999px;
  padding: 10px 22px;
  box-shadow: 0 4px 0 var(--ink);
  cursor: pointer;
  transition: transform .08s, box-shadow .08s;
}
.btn:active { transform: translateY(4px); box-shadow: 0 0 0 var(--ink); }
.btn:disabled { opacity: .5; pointer-events: none; }
.btn.ghost { background: #fff; }
.btn.bad { background: var(--coral); color: #fff; }
.btn.good { background: var(--mint); }
.btn.small { padding: 5px 14px; font-size: 15px; box-shadow: 0 3px 0 var(--ink); }
.btn.block { display: block; width: 100%; }
a.link, .linkbtn { color: var(--ink); font-weight: 800; background: none; border: 0; text-decoration: underline; cursor: pointer; font-family: inherit; font-size: inherit; padding: 4px 0; }

input, select, textarea {
  font: inherit;
  color: var(--ink);
  width: 100%;
  padding: 11px 14px;
  background: #fff;
  border: 2.5px solid var(--ink);
  border-radius: 14px;
}
textarea { min-height: 120px; resize: vertical; }
label { display: block; font-weight: 800; font-size: 15px; }
label > input, label > select, label > textarea { margin-top: 5px; font-weight: 600; }
.form > * + * { margin-top: 14px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
fieldset { border: 2.5px dashed var(--line); border-radius: 16px; padding: 12px; }
legend { font-weight: 800; padding: 0 6px; }
.err { background: #FFE3E8; border: 2.5px solid var(--coral); border-radius: 14px; padding: 10px 14px; font-weight: 700; }
.ok { background: #DDFBF1; border: 2.5px solid var(--mint); border-radius: 14px; padding: 10px 14px; font-weight: 700; }

/* ---------- Chips and tags ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font: 800 16px Nunito, sans-serif;
  background: #fff; color: var(--ink);
  border: 2.5px solid var(--ink); border-radius: 999px;
  padding: 8px 18px; cursor: pointer;
}
.chip.sel { background: var(--ink); color: #fff; }
.tag { display: inline-block; font-weight: 800; font-size: 14px; background: var(--c, var(--sun)); border: 2px solid var(--ink); border-radius: 999px; padding: 1px 12px; }
.tag.plain { background: #fff; }
.chk { display: inline-block; margin: 0 8px 8px 0; font-weight: 700; }
.chk input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.chk span { display: inline-block; border: 2.5px solid var(--ink); border-radius: 999px; padding: 4px 14px; background: #fff; cursor: pointer; }
.chk input:checked + span { background: var(--mint); }
.chk input:focus-visible + span { outline: 3px solid var(--sky); outline-offset: 2px; }

/* ---------- Switch ---------- */
.sw { flex: none; width: 52px; height: 30px; border-radius: 99px; border: 2.5px solid var(--ink); background: #fff; position: relative; cursor: pointer; padding: 0; }
.sw::after { content: ''; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%; background: var(--ink); transition: transform .15s; }
.sw.on { background: var(--mint); }
.sw.on::after { transform: translateX(22px); }

/* ---------- Brand header ---------- */
.brand { text-align: center; padding: 14px 0 22px; }
.logo {
  width: 92px; height: 92px; margin: 0 auto 14px; border-radius: 50%;
  border: 3px solid var(--ink); background: var(--sun); box-shadow: 0 5px 0 var(--ink);
  display: grid; place-items: center; overflow: hidden;
  font: 800 44px 'Baloo 2', sans-serif;
}
.logo img { width: 100%; height: 100%; object-fit: cover; }
.logo.sm { width: 40px; height: 40px; margin: 0; font-size: 20px; border-width: 2.5px; box-shadow: 0 3px 0 var(--ink); }

/* ---------- Student steps ---------- */
.steps { list-style: none; padding: 0; }
.step { margin-bottom: 22px; }
.step h2 { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; font-size: 20px; }
.num { flex: none; width: 32px; height: 32px; border-radius: 50%; background: var(--ink); color: #fff; display: grid; place-items: center; font-size: 17px; }

.exam h3 { margin: 8px 0 2px; }
.exam .meta { margin-bottom: 12px; }

/* ---------- Quiz ---------- */
.qbar { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px; padding: 12px 0; background: var(--bg); }
.segs { display: flex; gap: 4px; flex: 1; }
.segs i { height: 12px; flex: 1; border-radius: 99px; background: #fff; border: 2px solid var(--ink); }
.segs i.on { background: var(--mint); }
.segs i.cur { background: var(--sun); }
.timer { font: 800 18px 'Baloo 2', sans-serif; background: var(--ink); color: #fff; border-radius: 99px; padding: 2px 14px; min-width: 80px; text-align: center; font-variant-numeric: tabular-nums; }
.timer.low { background: var(--coral); }
.qtext { font-size: 24px; margin: 6px 0 18px; word-break: break-word; }
.opts > * + * { margin-top: 12px; }
.opt {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  padding: 13px 14px; border: 2.5px solid var(--ink); border-radius: 18px; background: #fff; color: var(--ink);
  box-shadow: 0 4px 0 var(--ink); font: 700 17px Nunito, sans-serif; cursor: pointer;
  transition: transform .08s, box-shadow .08s;
}
.opt:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--ink); }
.opt .let { flex: none; width: 34px; height: 34px; border-radius: 50%; border: 2.5px solid var(--ink); display: grid; place-items: center; font: 800 16px 'Baloo 2', sans-serif; background: var(--bg); }
.opt.sel { background: var(--sun); }
.opt.sel .let { background: var(--ink); color: #fff; }
.opts.tf { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.opts.tf > * + * { margin-top: 0; }
.opts.tf .opt { justify-content: center; font: 800 24px 'Baloo 2', sans-serif; padding: 30px 8px; }
.opts.tf .opt.t.sel { background: var(--mint); }
.opts.tf .opt.f.sel { background: var(--coral); color: #fff; }
.nav { display: flex; gap: 12px; margin-top: 22px; }
.nav .btn { flex: 1; }

/* ---------- Result ring ---------- */
.ring { position: relative; width: 210px; height: 210px; margin: 24px auto 18px; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 14; }
.ring .bg { stroke: #fff; }
.ring .fg { stroke: var(--mint); stroke-linecap: round; transition: stroke-dashoffset 1.1s cubic-bezier(.2, .8, .2, 1); }
.ring .val { position: absolute; inset: 0; display: grid; place-content: center; font: 800 62px 'Baloo 2', sans-serif; line-height: 1; }
.ring .val small { font-size: 26px; color: var(--ink2); }

/* ---------- Sheet and toast ---------- */
.overlay { position: fixed; inset: 0; background: rgba(36, 26, 92, .55); display: flex; align-items: flex-end; justify-content: center; z-index: 50; }
.sheet {
  background: #fff; border: 2.5px solid var(--ink); border-bottom: 0; border-radius: 26px 26px 0 0;
  width: 100%; max-width: 640px; max-height: 92vh; overflow: auto;
  padding: 20px 18px calc(24px + env(safe-area-inset-bottom));
  animation: up .22s ease-out;
}
.sheet > h2 { margin-bottom: 6px; }
.sheet .close { display: block; width: 100%; margin-top: 16px; }
@keyframes up { from { transform: translateY(40px); opacity: 0; } }
.toast { position: fixed; top: 14px; left: 50%; transform: translateX(-50%); max-width: 92vw; background: var(--ink); color: #fff; padding: 10px 18px; border-radius: 99px; font-weight: 800; z-index: 99; text-align: center; }
.toast.bad { background: var(--coral); }
.empty { text-align: center; padding: 26px 12px; }
.empty h3 { margin-bottom: 4px; }
.spin { text-align: center; padding: 40px; font-weight: 800; color: var(--ink2); }

/* ---------- Staff app ---------- */
.apphead { display: flex; align-items: center; gap: 12px; padding: 12px 16px; max-width: 760px; margin: 0 auto; }
.apphead .who { line-height: 1.15; }
.page { max-width: 760px; margin: 0 auto; padding: 4px 16px 110px; }
.head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 8px 0 16px; }
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; background: var(--ink);
  display: flex; gap: 4px; padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
  justify-content: center;
}
.tabbar button { flex: 1; max-width: 140px; color: #D5CEFF; background: none; border: 0; border-radius: 16px; padding: 7px 2px; font: 800 12px Nunito, sans-serif; display: grid; gap: 2px; justify-items: center; cursor: pointer; }
.tabbar button.on { background: var(--sun); color: var(--ink); }
.tabbar svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.seg { display: flex; gap: 6px; margin: 12px 0; }
.seg button { flex: 1; font: 800 15px Nunito, sans-serif; padding: 8px 4px; border: 2.5px solid var(--ink); border-radius: 12px; background: #fff; color: var(--ink); cursor: pointer; }
.seg button.on { background: var(--ink); color: #fff; }
.list-row { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-top: 2px dashed var(--line); }
.list-row:first-child { border-top: 0; }
.pill { flex: none; font: 800 17px 'Baloo 2', sans-serif; border: 2.5px solid var(--ink); border-radius: 99px; padding: 0 12px; background: var(--c); }
.res { width: 100%; text-align: left; background: none; border: 0; color: inherit; font: inherit; padding: 0; }
.res.tap { cursor: pointer; }
.item { border: 2.5px solid var(--ink); border-radius: 16px; padding: 12px; margin-top: 12px; background: #fff; }
.item.wrong { background: #FFF0F3; }
.item.right { background: #EAFBF5; }
.item p + p { margin-top: 4px; }
.filters { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 16px; }
.login-card { margin-top: 10px; }

/* ---------- Leaderboard ---------- */
.board-row { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-top: 2px dashed var(--line); }
.board-row:first-child { border-top: 0; }
.board-row.me { background: #FFF6D6; margin: 0 -10px; padding: 10px; border-radius: 14px; border-top-color: transparent; }
.rank { flex: none; width: 34px; height: 34px; border-radius: 50%; border: 2.5px solid var(--ink); display: grid; place-items: center; font: 800 16px 'Baloo 2', sans-serif; background: #fff; }
.rank.r1 { background: var(--sun); }
.rank.r2 { background: var(--sky); }
.rank.r3 { background: var(--mint); }

@media (max-width: 380px) { .two { grid-template-columns: 1fr; } .filters { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}