*,*:before,*:after{box-sizing:border-box}:root{--bg: #f5f5f5;--surface: #ffffff;--primary: #4f6ef7;--primary-hover: #3a57d4;--text: #1a1a2e;--muted: #6b7280;--correct: #16a34a;--wrong: #dc2626;--border: #e2e8f0;--radius: 12px;font-family:system-ui,-apple-system,sans-serif;font-size:16px;line-height:1.5;color:var(--text);background:var(--bg)}@media (prefers-color-scheme: dark){:root{--bg: #0f172a;--surface: #1e293b;--text: #f1f5f9;--muted: #94a3b8;--border: #334155}}body{margin:0;min-height:100dvh;display:flex;align-items:flex-start;justify-content:center;padding:2rem 1rem}#language-select,#lesson-select,#quiz,#summary{width:100%;max-width:480px;background:var(--surface);border-radius:var(--radius);padding:2rem;box-shadow:0 2px 12px #00000014}h1{margin:0 0 .25rem;font-size:2rem;text-align:center}.subtitle{margin:0 0 1.5rem;text-align:center;color:var(--muted)}#language-list,#lesson-list{display:flex;flex-direction:column;gap:.75rem}#lesson-back-btn{background:transparent;color:var(--primary);border:2px solid var(--primary);padding:.4rem .9rem;font-size:.9rem;margin-bottom:1.25rem}#lesson-back-btn:hover{background:var(--primary);color:#fff}#quiz header{display:flex;align-items:center;gap:.75rem;margin-bottom:2rem}#progress-text{white-space:nowrap;font-size:.85rem;color:var(--muted)}.progress-bar{flex:1;height:6px;background:var(--border);border-radius:99px;overflow:hidden}#progress-bar-fill{height:100%;background:var(--primary);border-radius:99px;transition:width .3s ease}.prompt-label{margin:0 0 .5rem;color:var(--muted);font-size:.9rem}#word-native{margin:0 0 1.5rem;font-size:2rem;font-weight:700;letter-spacing:.02em}#quiz-form{display:flex;gap:.5rem}input[type=text]{flex:1;padding:.65rem .9rem;border:2px solid var(--border);border-radius:var(--radius);font-size:1rem;font-family:inherit;background:var(--bg);color:var(--text);transition:border-color .2s;outline:none}input[type=text]:focus{border-color:var(--primary)}input.correct{border-color:var(--correct)}input.wrong{border-color:var(--wrong)}#virtual-keyboard{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:.75rem}.kbd-key{padding:.4rem .65rem;font-size:.95rem;font-weight:400;background:var(--bg);color:var(--text);border:1.5px solid var(--border);border-radius:6px;min-width:2.2rem}.kbd-key:hover:not(:disabled){background:var(--border)}.kbd-key:disabled{opacity:.35;cursor:default}.feedback{margin:1rem 0 0;padding:.65rem 1rem;border-radius:var(--radius);font-weight:600}.feedback.correct{background:#dcfce7;color:var(--correct)}.feedback.wrong{background:#fee2e2;color:var(--wrong)}@media (prefers-color-scheme: dark){.feedback.correct{background:#14532d}.feedback.wrong{background:#7f1d1d}}#next-btn{margin-top:.75rem;width:100%}#summary h2{margin:0 0 .5rem;font-size:1.5rem}#summary p{color:var(--muted);margin:0 0 1.5rem}#summary p strong{color:var(--text);font-size:1.1rem}#missed-section h3{margin:0 0 .75rem;font-size:1rem}#missed-list{list-style:none;padding:0;margin:0 0 1.5rem;display:flex;flex-direction:column;gap:.4rem}#missed-list li{padding:.5rem .75rem;background:var(--bg);border-radius:8px;font-size:.95rem}.word-foreign{font-weight:600}#restart-btn{width:100%}button{padding:.65rem 1.2rem;border:none;border-radius:var(--radius);background:var(--primary);color:#fff;font-size:1rem;font-family:inherit;font-weight:600;cursor:pointer;transition:background .15s}button:hover{background:var(--primary-hover)}button:focus-visible{outline:3px solid var(--primary);outline-offset:2px}