:root { color-scheme: light dark; --bg: #fff; --text: #172133; --muted: #536277; --line: #c7d0dd; --surface: #f3f6fa; --accent: #0055bc; --good: #176338; --bad: #ae2635; --focus: #805100; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.6; font-size: 1.0625rem; }
a { color: var(--accent); text-underline-offset: .22em; }
button, summary, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; cursor: pointer; min-height: 48px; border-radius: 12px; border: 1px solid var(--line); padding: .8rem 1.2rem; }
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
h1:focus { outline: none; }
h1 { font-size: 1.18rem; line-height: 1.4; font-weight: 650; margin: 0 0 1rem; }
h2 { font-size: 1rem; margin: 0 0 .7rem; color: var(--muted); }
p { margin: 0 0 1.25rem; }
.branding { padding: 2.5rem 1.25rem 1.75rem; text-align: center; }
.branding a { display: inline-flex; border-radius: 8px; background: transparent; padding: 13px 20px; }
.branding img { display: block; width: min(244px, 65vw); height: auto; }
.domain { display: flex; gap: .7rem; align-items: center; justify-content: center; font-size: .8rem; letter-spacing: .07em; color: var(--muted); margin: .7rem auto 0; }
.domain::before, .domain::after { content: ''; height: 1px; width: 25px; background: var(--line); }
main { width: min(100% - 2.5rem, 640px); margin: 0 auto; min-height: 24rem; }
body:has(.branding[hidden]) main { padding-top: 2rem; }
.sentence { color: var(--accent); font-size: clamp(1.45rem, 3.6vw, 1.9rem); line-height: 1.5; font-weight: 600; margin-block: 1.4rem 1.7rem; overflow-wrap: break-word; }
.instruction { color: var(--muted); font-size: .95rem; }
.choices { display: grid; gap: .8rem; margin-bottom: 1.8rem; }
.choice { text-align: left; display: flex; align-items: center; gap: 1rem; background: var(--bg); color: var(--text); min-height: 64px; font-size: 1.15rem; }
.choice:hover { background: var(--surface); border-color: var(--accent); }
.radio-ring { flex: 0 0 20px; height: 20px; border: 2px solid var(--muted); border-radius: 50%; }
.primary { color: white; background: #0055bc; border-color: #0055bc; }
.secondary { color: var(--accent); background: var(--bg); }
.summary { padding: 1.5rem; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; margin-bottom: 1rem; }
.summary h1 { font-size: 1.6rem; margin-bottom: .5rem; }
.score { margin: 0; font-size: 1.15rem; font-weight: 600; }
.review { padding: 0; list-style: none; margin: 2rem 0; }
.review-card { padding: 1.5rem 0; border-bottom: 1px solid var(--line); content-visibility: auto; contain-intrinsic-size: auto 300px; }
.review-card .sentence { font-size: 1.2rem; margin: .5rem 0 1.1rem; }
.review-choices { list-style: none; padding: 0; display: grid; gap: .5rem; }
.review-choices li { display: flex; flex-wrap: wrap; gap: .3rem 1rem; align-items: baseline; padding: .4rem .6rem; border-radius: 6px; }
.answer-mark { font-size: .9rem; }
.correct { color: var(--good); background: var(--surface); }
.incorrect { color: var(--bad); background: var(--surface); }
footer { width: min(100% - 2.5rem, 640px); margin: 4rem auto 1.5rem; color: var(--muted); font-size: .875rem; border-top: 1px solid var(--line); padding-top: 1rem; }
summary { cursor: pointer; min-height: 44px; padding-block: .5rem; color: var(--text); }
details p { margin-block: 1rem; }
footer nav { display: flex; flex-wrap: wrap; gap: .3rem 1.25rem; margin-top: 1rem; }
footer nav a { padding-block: .6rem; min-height: 44px; }
.copyright { margin-top: 1rem; }
.skip-link { position: absolute; left: 1rem; top: -8rem; padding: .75rem; background: var(--bg); z-index: 1; }
.skip-link:focus { top: 1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
[hidden] { display: none !important; }
@media (prefers-color-scheme: dark) { :root { --bg: #101827; --text: #edf2fa; --muted: #a9b8ce; --line: #40516c; --surface: #1a263b; --accent: #80b6ff; --good: #83dca2; --bad: #ffa4ae; --focus: #ffcf70; } }
@media (max-height: 520px) { .branding { padding-top: 1rem; padding-bottom: 1rem; } }
@media (forced-colors: active) { .choice, .summary { border: 1px solid ButtonText; } }

.site-footer .footer-main, .site-footer .footer-actions, .site-footer .footer-bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem 2rem; }
.site-footer nav.links { flex: 1 1 28rem; justify-content: flex-start; margin-top: 1rem; }
.site-footer .footer-actions { justify-content: center; gap: 1.5rem; padding: .625rem; }
.site-footer .app-store-badge { display: inline-flex; }
.site-footer .app-store-badge img { display: block; width: auto; height: 40px; }
.site-footer .footer-social { display: inline-flex; align-items: center; min-height: 44px; }
.site-footer .footer-bottom { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--line); gap: .75rem 2rem; }
.site-footer .copyright { margin: 0; }
.site-footer .app-store-credit { max-width: 34rem; font-size: .7rem; line-height: 1.5; }
@media (max-width: 700px) { .site-footer .footer-main, .site-footer .footer-bottom { flex-direction: column; text-align: center; } .site-footer nav.links { flex-basis: auto; justify-content: center; } }