:root{color-scheme:light;--bg: #f7f7f4;--panel: #ffffff;--text: #1f2933;--muted: #667085;--line: #d9ded7;--accent: #206b5f;--accent-strong: #174e46;--danger: #b42318;--success: #087443}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.app-shell{min-height:100vh;display:grid;grid-template-rows:1fr auto}main{width:min(100%,680px);align-self:center;justify-self:center;padding:24px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:clamp(22px,5vw,40px);box-shadow:0 18px 60px #1f293314}h1{margin:0 0 8px;font-size:clamp(24px,4vw,34px);line-height:1.15;letter-spacing:0}.subtitle{margin:0 0 18px;color:var(--muted);font-size:15px;font-weight:700}.category-select{display:grid;gap:7px;margin:0 0 24px}.category-select span{color:var(--muted);font-size:12px;font-weight:800}.category-select select{min-height:46px;width:100%;padding:0 12px;border:1px solid var(--line);border-radius:8px;background:#fbfcfa;color:var(--text);font:inherit;font-size:15px;font-weight:750}.category-select select:focus-visible{border-color:var(--accent);outline:2px solid rgba(32,107,95,.18);outline-offset:2px}.context{margin:0 0 18px;padding:16px;border:1px solid var(--line);border-radius:8px;background:#fbfcfa;color:var(--text);font-size:16px;line-height:1.7;white-space:pre-line}.question{min-height:88px;margin:0 0 22px;font-size:clamp(22px,4vw,30px);line-height:1.55;font-weight:700}.choices{display:grid;gap:12px;margin:0 0 22px}.choice{width:100%;min-height:52px;display:flex;align-items:center;gap:14px;padding:13px 16px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--text);font:inherit;text-align:left;cursor:pointer}.choice:hover,.choice:focus-visible{border-color:var(--accent);outline:none}.choice.selected{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.choice:disabled{cursor:not-allowed;opacity:.72}.choice-marker{width:28px;height:28px;flex:0 0 28px;display:grid;place-items:center;border-radius:999px;background:#eef4f1;color:var(--accent-strong);font-size:14px;font-weight:800}.choice-text{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}.choice-kana{color:var(--muted);font-size:14px}.actions{display:flex;align-items:center;justify-content:flex-start;gap:16px;flex-wrap:wrap}.primary{min-height:44px;padding:0 18px;border:0;border-radius:8px;background:var(--accent);color:#fff;font:inherit;font-weight:800;cursor:pointer}.primary:disabled{cursor:not-allowed;opacity:.5}.feedback{min-height:48px;margin:0 0 18px;color:var(--muted);font-size:15px;line-height:1.6}.feedback strong{display:block;margin-bottom:6px;color:var(--text);font-size:18px}.feedback-line{display:block;margin-top:4px;white-space:pre-line}.feedback.correct strong{color:var(--success)}.feedback.incorrect strong{color:var(--danger)}.site-footer{width:min(100%,680px);justify-self:center;display:flex;justify-content:space-between;gap:16px;padding:0 24px 24px;color:var(--muted);font-size:13px;line-height:1.5}.site-footer a{color:inherit;text-decoration:none}.site-footer a:hover,.site-footer a:focus-visible{color:var(--accent-strong);text-decoration:underline}@media (max-width: 520px){.site-footer{flex-direction:column;gap:4px}}