:root {
  --quiz-ink: #192232;
  --quiz-muted: #596779;
  --quiz-paper: #faf9f5;
  --quiz-card: #fffefb;
  --quiz-yellow: #fff0a9;
  --quiz-green: #d9fbe2;
  --quiz-green-strong: #176b3a;
  --quiz-red: #ffe0dc;
  --quiz-red-strong: #a62c25;
  --quiz-blue: #eaf4ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--quiz-paper); color: var(--quiz-ink); font-family: var(--nb-font-primary); }
button, select { font: inherit; }
button, select, a { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, select:focus-visible { outline: 4px solid #2563eb; outline-offset: 4px; }
.quiz-page { width: min(1120px, calc(100% - 36px)); margin: 0 auto; padding: 28px 0 80px; }
.quiz-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.quiz-back { display: inline-flex; padding: 11px 16px; border: 2px solid var(--quiz-ink); background: #fff; box-shadow: 4px 4px 0 var(--quiz-ink); color: inherit; text-decoration: none; font-weight: 900; }
.quiz-back:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--quiz-ink); background: var(--quiz-yellow); }
.quiz-topic-control { display: flex; align-items: center; gap: 10px; font-weight: 900; }
.quiz-topic-control select { max-width: 260px; padding: 10px 38px 10px 12px; border: 2px solid var(--quiz-ink); background: var(--quiz-card); color: inherit; box-shadow: 3px 3px 0 var(--quiz-ink); font-weight: 800; }
.quiz-hero { margin: 30px 0 26px; padding: 38px 42px; border: 3px solid var(--quiz-ink); background: var(--quiz-card); box-shadow: 8px 8px 0 var(--quiz-ink); }
.quiz-kicker { display: inline-block; padding: 7px 10px; border: 2px solid var(--quiz-ink); background: #c8ff77; font: 900 12px var(--nb-font-mono); letter-spacing: .08em; }
.quiz-hero h1 { margin: 18px 0 10px; font: 900 clamp(38px, 6vw, 68px)/1 var(--nb-font-serif); letter-spacing: -.04em; }
.quiz-hero p { max-width: 800px; margin: 0; color: var(--quiz-muted); font-size: 18px; line-height: 1.65; }
.quiz-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.quiz-pill { padding: 7px 10px; border: 2px solid var(--quiz-ink); background: var(--quiz-yellow); font: 900 12px var(--nb-font-mono); }
.quiz-access-status { margin: 18px 0 0; padding: 12px 14px; border: 2px dashed var(--quiz-ink); background: var(--quiz-blue); color: var(--quiz-ink); font-size: 14px; font-weight: 850; }
.quiz-access-status.is-unlocked { background: var(--quiz-green); color: var(--quiz-green-strong); }
.quiz-stats { position: sticky; top: 12px; z-index: 5; display: grid; grid-template-columns: 145px 145px 1fr auto; align-items: center; gap: 14px; margin-bottom: 26px; padding: 14px 16px; border: 3px solid var(--quiz-ink); background: var(--quiz-blue); box-shadow: 6px 6px 0 var(--quiz-ink); }
.quiz-stat { display: grid; gap: 2px; }
.quiz-stat span { color: var(--quiz-muted); font: 800 11px var(--nb-font-mono); letter-spacing: .07em; text-transform: uppercase; }
.quiz-stat strong { font-size: 22px; }
.quiz-progress { height: 16px; overflow: hidden; border: 2px solid var(--quiz-ink); background: #fff; }
.quiz-progress__bar { width: 0; height: 100%; background: #45b96c; transition: width .25s ease; }
.quiz-reset, .quiz-notes-link { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 9px 13px; border: 2px solid var(--quiz-ink); background: #fff; color: inherit; box-shadow: 3px 3px 0 var(--quiz-ink); text-decoration: none; font-weight: 900; cursor: pointer; }
.quiz-reset:hover, .quiz-notes-link:hover { background: var(--quiz-yellow); transform: translate(1px, 1px); box-shadow: 2px 2px 0 var(--quiz-ink); }
.quiz-list { display: grid; gap: 22px; }
.quiz-card { scroll-margin-top: 100px; padding: 24px; border: 3px solid var(--quiz-ink); background: var(--quiz-card); box-shadow: 6px 6px 0 var(--quiz-ink); }
.quiz-card__meta { display: flex; align-items: center; gap: 9px; margin-bottom: 12px; }
.quiz-card__number { display: inline-flex; min-width: 42px; height: 32px; align-items: center; justify-content: center; margin-bottom: 12px; border: 2px solid var(--quiz-ink); background: var(--quiz-yellow); font: 900 13px var(--nb-font-mono); }
.quiz-card__meta .quiz-card__number { margin-bottom: 0; }
.quiz-card__difficulty { display: inline-flex; min-height: 30px; align-items: center; padding: 4px 9px; border: 2px solid var(--quiz-ink); font: 900 11px var(--nb-font-mono); letter-spacing: .06em; }
.quiz-card__difficulty--easy { background: var(--quiz-green); color: #103d25; }
.quiz-card__difficulty--medium { background: var(--quiz-yellow); color: #493c00; }
.quiz-card__difficulty--hard { background: var(--quiz-red); color: #591a17; }
.quiz-card h2 { margin: 0 0 18px; font-size: 21px; line-height: 1.5; }
.quiz-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
.quiz-option { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 10px; align-items: center; min-height: 58px; padding: 11px 13px; border: 2px solid var(--quiz-ink); background: #fff; color: var(--quiz-ink); text-align: left; white-space: normal; cursor: pointer; transition: transform .12s ease, box-shadow .12s ease, background .12s ease; }
.quiz-option:hover:not(:disabled) { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--quiz-ink); background: #f7fbff; }
.quiz-option:disabled { cursor: default; opacity: 1; }
.quiz-option__letter { display: inline-flex; width: 32px; height: 32px; align-items: center; justify-content: center; border: 2px solid var(--quiz-ink); background: var(--quiz-yellow); font: 900 13px var(--nb-font-mono); }
.quiz-option__copy { min-width: 0; line-height: 1.45; font-weight: 750; white-space: normal; overflow-wrap: anywhere; word-break: break-word; }
.quiz-option__status { display: block; margin-top: 4px; color: currentColor; font: 900 11px var(--nb-font-mono); letter-spacing: .05em; }
.quiz-option.is-correct { border-color: var(--quiz-green-strong); background: var(--quiz-green); box-shadow: 4px 4px 0 var(--quiz-green-strong); color: #103d25; }
.quiz-option.is-wrong { border-color: var(--quiz-red-strong); background: var(--quiz-red); box-shadow: 4px 4px 0 var(--quiz-red-strong); color: #591a17; }
.quiz-feedback { display: none; margin-top: 16px; padding: 15px 17px; border: 2px dashed var(--quiz-ink); line-height: 1.65; }
.quiz-feedback.is-visible { display: block; }
.quiz-feedback.is-correct { background: var(--quiz-green); }
.quiz-feedback.is-wrong { background: var(--quiz-red); }
.quiz-feedback strong { display: block; margin-bottom: 3px; }
.quiz-footer { display: flex; justify-content: space-between; gap: 14px; align-items: center; margin-top: 32px; flex-wrap: wrap; }
.quiz-live { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }
.quiz-error { padding: 24px; border: 3px solid var(--quiz-red-strong); background: var(--quiz-red); font-weight: 800; }
.quiz-paywall { padding: clamp(28px, 6vw, 58px); border: 3px solid var(--quiz-ink); background: var(--quiz-yellow); box-shadow: 8px 8px 0 var(--quiz-ink); text-align: center; }
.quiz-paywall__badge { display: inline-flex; padding: 7px 10px; border: 2px solid var(--quiz-ink); background: #fff; font: 900 12px var(--nb-font-mono); letter-spacing: .08em; }
.quiz-paywall h2 { margin: 18px 0 12px; font: 900 clamp(30px, 5vw, 48px)/1.08 var(--nb-font-serif); letter-spacing: -.035em; }
.quiz-paywall > p { max-width: 680px; margin: 0 auto; font-size: 17px; line-height: 1.7; }
.quiz-paywall__button { display: inline-flex; align-items: center; justify-content: center; min-height: 54px; margin: 24px auto 14px; padding: 13px 22px; border: 3px solid var(--quiz-ink); background: #635bff; color: #fff; box-shadow: 5px 5px 0 var(--quiz-ink); text-decoration: none; font: inherit; font-weight: 950; cursor: pointer; }
.quiz-paywall__button:hover { transform: translate(2px, 2px); box-shadow: 3px 3px 0 var(--quiz-ink); background: #5148e5; }
.quiz-paywall__button:disabled { cursor: wait; opacity: .72; transform: none; box-shadow: 5px 5px 0 var(--quiz-ink); }
.quiz-paywall .quiz-paywall__note { max-width: 620px; color: #443f25; font-size: 13px; font-weight: 800; }

[data-theme='dark'] {
  --quiz-ink: #f3f4f6;
  --quiz-muted: #c8d0db;
  --quiz-paper: #111;
  --quiz-card: #191919;
  --quiz-yellow: #ffe76b;
  --quiz-green: #173b25;
  --quiz-green-strong: #69d891;
  --quiz-red: #40201e;
  --quiz-red-strong: #ff9188;
  --quiz-blue: #172636;
}
[data-theme='dark'] .quiz-back, [data-theme='dark'] .quiz-topic-control select, [data-theme='dark'] .quiz-reset, [data-theme='dark'] .quiz-notes-link, [data-theme='dark'] .quiz-option { background: #202020; color: var(--quiz-ink); }
[data-theme='dark'] .quiz-option.is-correct { background: var(--quiz-green); color: #e8fff0; }
[data-theme='dark'] .quiz-option.is-wrong { background: var(--quiz-red); color: #fff0ef; }
[data-theme='dark'] body .quiz-card .quiz-card__difficulty--easy { background: var(--quiz-green) !important; color: #e8fff0 !important; }
[data-theme='dark'] body .quiz-card .quiz-card__difficulty--medium { background: var(--quiz-yellow) !important; color: #493c00 !important; }
[data-theme='dark'] body .quiz-card .quiz-card__difficulty--hard { background: var(--quiz-red) !important; color: #fff0ef !important; }
[data-theme='dark'] .quiz-option__letter, [data-theme='dark'] .quiz-pill, [data-theme='dark'] .quiz-card__number { color: #111; }
[data-theme='dark'] .quiz-paywall { background: #d7bd45; color: #111; }
[data-theme='dark'] .quiz-paywall__badge { background: #202020; color: #fff; }
[data-theme='dark'] .quiz-paywall .quiz-paywall__note { color: #2e2918; }

@media (max-width: 760px) {
  .quiz-page { width: min(100% - 28px, 1120px); padding-top: 20px; }
  .quiz-hero { padding: 30px 24px; }
  .quiz-stats { position: static; grid-template-columns: 1fr 1fr; }
  .quiz-progress { grid-column: 1 / -1; }
  .quiz-reset { grid-column: 1 / -1; }
  .quiz-options { grid-template-columns: 1fr; }
}

@media (max-width: 430px) {
  .quiz-page { width: min(100% - 20px, 1120px); }
  .quiz-toolbar, .quiz-topic-control { align-items: stretch; flex-direction: column; }
  .quiz-topic-control select { max-width: none; width: 100%; }
  .quiz-hero { padding: 25px 18px; }
  .quiz-card { padding: 18px 14px; box-shadow: 4px 4px 0 var(--quiz-ink); }
  .quiz-card h2 { font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; transform: none !important; }
}