:root{color-scheme:light;--paper:#f4efe4;--card:#fffdf8;--ink:#22201c;--muted:#726c62;--line:#b9b1a4;--button:#2f2b26;--success:#245b33;--error:#8a3227}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top,rgba(255,255,255,.7),transparent 34rem),var(--paper);color:var(--ink);font-family:Georgia,"Times New Roman",serif}.app-shell{width:min(94vw,680px);margin:auto;padding:max(20px,env(safe-area-inset-top)) 0 32px}header{margin-bottom:18px}h1{margin:12px 0 6px;font-size:clamp(2.3rem,8vw,3.5rem);letter-spacing:-.045em}h2{line-height:1.25}header p,.card p,.status{color:var(--muted);font-family:system-ui,sans-serif;line-height:1.5}.back,.link-button{color:var(--muted);font-family:system-ui,sans-serif;font-size:.92rem}.card{padding:clamp(18px,4vw,30px);border:1px solid rgba(70,62,52,.18);border-radius:18px;background:rgba(255,253,248,.8);box-shadow:0 16px 50px rgba(68,57,43,.08)}.hidden{display:none}.modes,.choices{display:grid;gap:10px}.modes{grid-template-columns:repeat(2,1fr)}button,input{font:inherit}button{cursor:pointer;touch-action:manipulation}.modes button,.choices button,.primary{min-height:50px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);font-family:system-ui,sans-serif;font-weight:700}.primary{width:100%;margin-top:18px;background:var(--button);color:#fffdf8;border-color:var(--button)}button:disabled{opacity:.45;cursor:not-allowed}.link-button{border:0;background:transparent;text-decoration:underline;padding:14px 0 0}.question-meta{display:flex;justify-content:space-between;color:var(--muted);font:700 .78rem system-ui,sans-serif;letter-spacing:.04em;text-transform:uppercase}.choices{margin-top:20px}.choices button{text-align:left;padding:14px 16px}.choices button.selected{background:#e5ddd0;border:2px solid var(--ink)}.choices button.correct{background:#dfebdf;color:var(--success)}.choices button.incorrect{background:#f3dfda;color:var(--error)}.result{margin-top:18px;padding:14px;border-radius:10px;background:#f0ece4;font-family:system-ui,sans-serif;line-height:1.5}.result strong{display:block;margin-bottom:5px}.sync-row{display:flex;gap:8px;margin-top:6px}.sync-row input{min-width:0;flex:1;padding:11px;border:1px solid var(--line);border-radius:8px;background:var(--card)}.sync-row .primary{width:auto;margin:0;padding:0 16px}@media(max-width:460px){.modes{grid-template-columns:1fr}.sync-row{flex-direction:column}.sync-row .primary{width:100%;min-height:44px}}