:root{--bg:#f4f7f2;--card:#fff;--ink:#1f2a22;--muted:#66736a;--line:#dde5dc;--accent:#2f7d55;--accent-ink:#fff;--good:#2f9e44;--good-bg:#e6f6e9;--bad:#d6336c;--bad-bg:#fde8ef;--radius:16px;--shadow:0 1px 2px #1428190f, 0 8px 24px -12px #1428192e;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root{--bg:#18201b;--card:#222c25;--ink:#eef3ee;--muted:#9faea3;--line:#34413a;--accent:#4fb07d;--accent-ink:#0f1712;--good:#69db7c;--good-bg:#1f3a27;--bad:#f783ac;--bad-bg:#3d2230;--shadow:0 1px 2px #0000004d, 0 8px 24px -12px #0009;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:17px;line-height:1.45}button{font:inherit;color:inherit}h1,h2{margin:0 0 .4em;line-height:1.2}h1{font-size:1.4rem}h2{font-size:1.15rem}a{color:var(--accent)}.shell{flex-direction:column;max-width:640px;min-height:100vh;margin:0 auto;padding:0 16px;display:flex}.top{justify-content:space-between;align-items:center;gap:12px;padding:14px 0;display:flex}.logo{color:var(--ink);align-items:center;gap:8px;font-size:1.15rem;font-weight:700;text-decoration:none;display:flex}.top-right{align-items:center;gap:14px;display:flex}.link{color:var(--muted);cursor:pointer;background:0 0;border:0;padding:0;font-size:.95rem;text-decoration:none}.link:hover{color:var(--ink)}.user-slot{min-width:28px;min-height:28px;display:inline-flex}.page{flex-direction:column;flex:1;gap:16px;padding-bottom:24px;display:flex}.panel{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.intro p,.muted{color:var(--muted)}.prose p{margin:0 0 .9em}.prose h2{margin-top:1.2em}.error{background:var(--bad-bg);color:var(--ink);border-radius:12px;margin:0;padding:12px 14px}.btn{background:var(--accent);min-height:44px;color:var(--accent-ink);cursor:pointer;border:0;border-radius:12px;justify-content:center;align-items:center;gap:6px;padding:8px 18px;font-weight:600;text-decoration:none;display:inline-flex}.btn.ghost{color:var(--accent);box-shadow:inset 0 0 0 2px var(--line);background:0 0}.btn.big{min-height:52px;font-size:1.05rem}.decks{gap:16px;margin:0;padding:0;list-style:none;display:grid}.deck{flex-direction:column;gap:4px;display:flex}.deck p{margin:0}.deck .btn{margin-top:12px}.preview{gap:8px;margin-bottom:12px;display:flex}.preview img{aspect-ratio:3/2;object-fit:contain;border:1px solid var(--line);background:var(--bg);border-radius:4px;height:44px}.counts{color:var(--muted);font-size:.95rem}.study-bar{justify-content:space-between;align-items:center;display:flex}.card{flex-direction:column;align-items:stretch;gap:14px;display:flex}.card-image{aspect-ratio:3/2;object-fit:contain;background:var(--card);filter:drop-shadow(0 0 1px #00000073);border-radius:8px;width:100%;max-height:46vh;padding:1px}.question{text-align:center;margin:0;font-size:1.15rem}.options{gap:10px;display:grid}.option{text-align:left;background:var(--card);border:2px solid var(--line);cursor:pointer;border-radius:14px;align-items:center;gap:12px;min-height:56px;padding:10px 14px;transition:border-color .15s,background .15s;display:flex}.option:not(:disabled):hover{border-color:var(--accent)}.option:disabled{cursor:default;color:var(--ink)}.option .key{background:var(--bg);width:26px;height:26px;color:var(--muted);border-radius:8px;flex:none;place-items:center;font-size:.85rem;font-weight:600;display:inline-grid}.option.picked{border-color:var(--accent)}.option.right{border-color:var(--good);background:var(--good-bg)}.option.wrong{border-color:var(--bad);background:var(--bad-bg)}.option.dim{opacity:.55}.feedback{justify-content:space-between;align-items:center;gap:12px;min-height:52px;margin:0;font-weight:600;display:flex}.good{color:var(--good)}.bad{color:var(--bad)}.done p{margin:0 0 8px}.actions{flex-wrap:wrap;gap:10px;margin-top:12px;display:flex}@media (width>=560px){.options{grid-template-columns:1fr 1fr}}.footer{text-align:center;padding:20px 0;font-size:.9rem}.footer a{color:var(--muted)}