:root {
  --bg: #f4f1ff; --surface: #ffffff; --ink: #1d1b3a; --muted: #5b5880;
  --brand: #4b3fd1; --brand-ink: #ffffff; --accent: #ffb703;
  --good: #137a4d; --good-bg: #e2f6ec; --bad: #b3261e; --bad-bg: #fde8e6;
  --line: #d9d5f2; --shadow: 0 2px 8px rgba(40, 30, 120, .12);
  --fs: 18px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-contrast="high"]) {
    --bg: #14122b; --surface: #1f1c40; --ink: #ece9ff; --muted: #b0acd8;
    --brand: #8c82ff; --brand-ink: #14122b; --line: #3a3668;
    --good: #5be0a0; --good-bg: #123a2a; --bad: #ff8f87; --bad-bg: #44201f;
    --shadow: 0 2px 8px rgba(0, 0, 0, .4);
  }
}
:root[data-contrast="high"] {
  --bg: #000; --surface: #000; --ink: #fff; --muted: #fff;
  --brand: #ffe600; --brand-ink: #000; --line: #fff; --accent: #ffe600;
  --good: #3dff9a; --good-bg: #002a14; --bad: #ff6b6b; --bad-bg: #330000;
  --shadow: none;
}
:root[data-size="small"] { --fs: 16px; }
:root[data-size="large"] { --fs: 21px; }
:root[data-font="easy"] { --font: "OpenDyslexic", "Lexend", "Comic Sans MS", "Trebuchet MS", sans-serif; }
:root[data-font="easy"] body { letter-spacing: .04em; word-spacing: .12em; line-height: 1.75; }

* { box-sizing: border-box; }
html { font-size: var(--fs); }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); line-height: 1.5; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5rem; }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 10px 16px; background: #2b2a5c; color: #fff; padding-top: max(10px, env(safe-area-inset-top)); }
:root[data-contrast="high"] .top { background: #000; border-bottom: 2px solid #fff; }
.brand { background: none; border: 0; color: #fff; font-weight: 800; font-size: 1.15rem; min-height: 44px; padding: 0 4px; }
.stats { display: flex; align-items: center; gap: 8px; margin-left: auto; flex-wrap: wrap; }
.chip { background: rgba(255,255,255,.16); padding: 4px 10px; border-radius: 99px; font-size: .85rem; font-weight: 700; }
.xpbar { width: 110px; height: 10px; background: rgba(255,255,255,.25); border-radius: 99px; overflow: hidden; display: inline-block; }
.xpbar i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .4s; }
.icon { min-width: 44px; min-height: 44px; border-radius: 12px; border: 2px solid rgba(255,255,255,.5); background: transparent; color: #fff; font-weight: 800; }

.settings { max-width: 760px; margin: 12px auto 0; padding: 8px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.settings[hidden] { display: none; }
.settings .row { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 48px; flex-wrap: wrap; }
.settings input[type=checkbox] { width: 28px; height: 28px; }
.seg { display: inline-flex; border: 2px solid var(--brand); border-radius: 10px; overflow: hidden; }
.seg button { min-width: 48px; min-height: 44px; border: 0; background: var(--surface); }
.seg button[aria-pressed="true"] { background: var(--brand); color: var(--brand-ink); font-weight: 800; }

main { max-width: 900px; margin: 0 auto; padding: 16px; padding-bottom: max(32px, env(safe-area-inset-bottom)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 16px; margin: 0 0 14px; box-shadow: var(--shadow); }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.hello { font-size: 1.5rem; font-weight: 800; }

.btn { min-height: 48px; padding: 0 20px; border-radius: 12px; border: 2px solid var(--brand); background: var(--brand); color: var(--brand-ink); font-weight: 800; }
.btn.alt { background: transparent; color: var(--brand); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.ghost { min-height: 44px; padding: 0 14px; border-radius: 10px; border: 2px solid var(--line); background: transparent; }
.linkbtn { background: none; border: 0; color: var(--brand); text-decoration: underline; min-height: 44px; padding: 0; font-weight: 700; }

.zones { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.zone { text-align: left; background: var(--surface); border: 2px solid var(--line); border-radius: 18px; padding: 16px; min-height: 140px; box-shadow: var(--shadow); }
.zone .em { font-size: 2rem; display: block; }
.zone h3 { margin-top: 4px; }
.zone[aria-disabled="true"] { opacity: .65; cursor: default; }
.zone.open { border-color: var(--brand); }
.tag { display: inline-block; font-size: .75rem; font-weight: 800; padding: 2px 10px; border-radius: 99px; background: var(--line); }
.tag.go { background: var(--brand); color: var(--brand-ink); }

.tiers { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.tier { border: 2px solid var(--line); border-radius: 14px; padding: 12px; background: var(--surface); }
.tier.locked { opacity: .6; }
.tier .score { font-weight: 800; }

.bars { display: flex; flex-direction: column; gap: 6px; margin: 8px 0; }
.bar { display: flex; height: 26px; border: 2px solid var(--ink); border-radius: 6px; overflow: hidden; max-width: 380px; }
.bar span { flex: 1; border-right: 1px solid var(--ink); }
.bar span:last-child { border-right: 0; }
.bar span.on { background: var(--brand); }
.barlbl { font-size: .8rem; color: var(--muted); }

.qhead { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.prog { height: 10px; background: var(--line); border-radius: 99px; overflow: hidden; margin-bottom: 14px; }
.prog i { display: block; height: 100%; background: var(--brand); transition: width .3s; }
.layout { display: grid; gap: 14px; }
@media (min-width: 760px) { .layout.with-ex { grid-template-columns: 1.6fr 1fr; } }
.qtext { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; }
.example { background: var(--bg); border: 2px dashed var(--line); border-radius: 12px; padding: 12px; font-size: .92rem; }
.example b { display: block; margin-bottom: 4px; }
.opts { display: grid; gap: 10px; }
.opt { text-align: left; min-height: 52px; padding: 10px 14px; border-radius: 12px; border: 2px solid var(--line); background: var(--surface); }
.opt[aria-pressed="true"] { border-color: var(--brand); box-shadow: inset 0 0 0 2px var(--brand); font-weight: 700; }
.opt.right { border-color: var(--good); background: var(--good-bg); }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.field { width: 100%; min-height: 52px; padding: 10px 14px; border-radius: 12px; border: 2px solid var(--line); background: var(--surface); }
textarea.field { min-height: 130px; resize: vertical; }
.subq { margin: 14px 0 6px; font-weight: 700; }
.actions { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }

.banner { padding: 12px 14px; border-radius: 12px; font-weight: 800; margin-bottom: 10px; }
.banner.ok { background: var(--good-bg); color: var(--good); border: 2px solid var(--good); }
.banner.no { background: var(--bad-bg); color: var(--bad); border: 2px solid var(--bad); }
.fixit { border: 2px solid var(--accent); border-radius: 14px; padding: 14px; margin-top: 12px; background: var(--surface); }
.fixit h3 { display: flex; gap: 8px; align-items: center; }
.fixit dl { margin: 0; }
.fixit dt { font-weight: 800; margin-top: 8px; font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.fixit dd { margin: 2px 0 0; }
.retry { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--line); }
.rubric label { display: flex; gap: 10px; align-items: flex-start; min-height: 44px; padding: 6px 0; }
.rubric input { width: 26px; height: 26px; flex: none; margin-top: 2px; }
.crit { font-size: .78rem; font-weight: 800; color: var(--brand); }
.model { background: var(--bg); border-left: 5px solid var(--brand); padding: 10px 12px; border-radius: 8px; margin: 10px 0; }

.big { font-size: 2.4rem; font-weight: 900; }
.rev li { margin: 4px 0; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 140%); background: #2b2a5c; color: #fff; padding: 12px 18px; border-radius: 12px; font-weight: 800; transition: transform .3s; z-index: 20; max-width: 90vw; text-align: center; }
.toast.show { transform: translate(-50%, 0); }
:root[data-contrast="high"] .toast { background: #ffe600; color: #000; }

@media print { .top, .settings, .actions, .toast { display: none; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }