:root{--indigo: #4f46e5;--indigo-dark: #4338ca;--bg: #f7f7fb;--card: #ffffff;--text: #1a1a2e;--muted: #6b7280;--border: #e5e7eb;--green: #16a34a;--red: #dc2626;--radius: 14px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}#app{max-width:520px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:env(safe-area-inset-top) 16px calc(72px + env(safe-area-inset-bottom))}h1{font-size:26px;margin:20px 0 4px}.subtitle{color:var(--muted);margin:0 0 20px;font-size:14px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:14px}label,.field-label{display:block;font-size:13px;color:var(--muted);margin:0 0 6px}input[type=text]{width:100%;padding:13px 14px;font-size:17px;border:1px solid var(--border);border-radius:10px;background:#fff;color:var(--text)}input[type=text]:focus{outline:2px solid var(--indigo);border-color:transparent}button{font-size:16px;font-weight:500;padding:13px 16px;border:none;border-radius:10px;background:var(--indigo);color:#fff;cursor:pointer;width:100%}button:disabled{opacity:.5;cursor:default}button.secondary{background:#eef2ff;color:var(--indigo-dark)}button.ghost{background:transparent;color:var(--muted)}.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.grades button{padding:12px 4px;font-size:14px}.grade-again{background:var(--red)}.grade-hard{background:#f59e0b}.grade-good{background:var(--green)}.grade-easy{background:#0ea5e9}.option{text-align:left;background:#fff;color:var(--text);border:1px solid var(--border);margin-bottom:10px}.option.correct{border-color:var(--green);background:#f0fdf4}.option.wrong{border-color:var(--red);background:#fef2f2}.pill{display:inline-block;font-size:12px;color:var(--indigo-dark);background:#eef2ff;padding:3px 9px;border-radius:999px}.word-hero{font-size:30px;font-weight:600;margin:6px 0}.trans{color:var(--muted);font-size:15px;margin:2px 0}.error{color:var(--red);font-size:14px;margin-top:10px}.center{text-align:center}.muted{color:var(--muted)}nav.tabs{position:fixed;bottom:0;left:0;right:0;max-width:520px;margin:0 auto;display:flex;background:var(--card);border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom)}nav.tabs button{flex:1;background:transparent;color:var(--muted);border-radius:0;padding:12px 4px;font-size:12px}nav.tabs button.active{color:var(--indigo);font-weight:600}nav.tabs .ico{display:block;font-size:20px;margin-bottom:2px}.key{display:none}@media (min-width: 900px) and (hover: hover) and (pointer: fine){#app{max-width:720px;padding:84px 24px 48px}h1{font-size:30px;margin-top:12px}.word-hero{font-size:38px}.card{padding:24px}nav.tabs{top:0;bottom:auto;max-width:720px;border-top:none;border-bottom:1px solid var(--border);padding:0 12px;justify-content:flex-start;gap:4px}nav.tabs button{flex:0 0 auto;width:auto;padding:18px 16px 16px;font-size:15px;border-bottom:2px solid transparent}nav.tabs button.active{border-bottom-color:var(--indigo)}nav.tabs .ico{display:inline;font-size:15px;margin:0 6px 0 0}.option{display:flex;gap:12px;align-items:baseline}.option:hover:not(:disabled){border-color:var(--indigo)}.key{display:inline-block;font:500 11px ui-monospace,SF Mono,Menlo,monospace;color:var(--muted);border:1px solid var(--border);border-bottom-width:2px;border-radius:5px;padding:1px 6px;flex:none}.key.inline{margin-left:8px;color:inherit;opacity:.75;border-color:currentColor}}