:root{--bg: #fefae0;--card: #ffffff;--ink: #2b2b2b;--ink-soft: #6b6b5f;--accent: #2d6a4f;--accent-soft: #d8f3dc;--wrong: #c1440e;--wrong-soft: #ffe5d9;--border: #e6e2c8;--radius: 16px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}@media(prefers-color-scheme:dark){:root{--bg: #1c1f1d;--card: #262b28;--ink: #eae7d6;--ink-soft: #9aa094;--accent: #74c69d;--accent-soft: #2d3a33;--wrong: #f4845f;--wrong-soft: #3d2b24;--border: #37403b}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}#app{max-width:480px;margin:0 auto;padding:16px 16px calc(24px + env(safe-area-inset-bottom));min-height:100dvh;display:flex;flex-direction:column}header.app-header{display:flex;align-items:baseline;justify-content:space-between;padding:8px 4px 16px}header.app-header h1{font-size:1.15rem;margin:0;letter-spacing:.01em}.streak{font-size:.95rem;font-weight:600;color:var(--accent);white-space:nowrap}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:0 2px 8px #0000000d}.category-chip{display:inline-block;font-size:.8rem;font-weight:600;color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:4px 12px;margin-bottom:12px}.card h2{margin:0 0 12px;font-size:1.35rem;line-height:1.25}.lesson-text{font-size:1rem;line-height:1.65;color:var(--ink)}button.primary{display:block;width:100%;margin-top:20px;padding:14px;font-size:1.05rem;font-weight:600;color:#fff;background:var(--accent);border:none;border-radius:12px;cursor:pointer}button.primary:active{filter:brightness(.92)}button.secondary{display:block;width:100%;margin-top:10px;padding:12px;font-size:.98rem;font-weight:600;color:var(--accent);background:transparent;border:1.5px solid var(--accent);border-radius:12px;cursor:pointer}button.secondary:active{background:var(--accent-soft)}.progress-dots{display:flex;gap:6px;margin-bottom:16px}.progress-dots span{width:8px;height:8px;border-radius:50%;background:var(--border)}.progress-dots span.done{background:var(--accent)}.quiz-q{font-size:1.1rem;font-weight:600;line-height:1.4;margin:0 0 16px}button.choice{display:block;width:100%;text-align:left;padding:13px 14px;margin-bottom:10px;font-size:.98rem;line-height:1.4;color:var(--ink);background:var(--card);border:1.5px solid var(--border);border-radius:12px;cursor:pointer}button.choice:disabled{cursor:default;opacity:.85}button.choice.correct{border-color:var(--accent);background:var(--accent-soft);opacity:1}button.choice.wrong{border-color:var(--wrong);background:var(--wrong-soft);opacity:1}.why{font-size:.92rem;line-height:1.5;color:var(--ink-soft);background:var(--bg);border-radius:10px;padding:10px 12px;margin-top:4px}.done-emoji{font-size:3rem;text-align:center;margin:8px 0}.done-title{text-align:center;font-size:1.3rem;font-weight:700;margin:0 0 4px}.done-sub{text-align:center;color:var(--ink-soft);margin:0 0 16px}.fact-box{background:var(--accent-soft);border-radius:12px;padding:14px 16px;font-size:.98rem;line-height:1.55;margin-top:16px}.fact-box strong{color:var(--accent)}.sources{margin-top:16px;font-size:.85rem;color:var(--ink-soft)}.sources a{color:var(--accent)}.reread{margin-top:14px}.reread summary{font-size:.95rem;font-weight:600;color:var(--accent);cursor:pointer}.reread .lesson-text{margin-top:10px}footer.app-footer{margin-top:auto;padding-top:24px;text-align:center;display:flex;flex-direction:column;gap:10px}footer.app-footer button.library-link{color:var(--accent);font-size:.95rem;font-weight:600;text-decoration:none}footer.app-footer button{background:none;border:none;color:var(--ink-soft);font-size:.8rem;text-decoration:underline;cursor:pointer}