:root{--bg:#0f1020;--card:#1a1b2e;--line:#2a2c45;--text:#eef0ff;--muted:#9aa0c0;--accent:#6c63ff;--green:#2c9f5b;--red:#e84855}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{max-width:640px;margin:0 auto;padding:32px 20px 64px}header{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}header h1{margin:0;font-size:28px}.score{background:var(--card);border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:6px 14px;font-weight:600}.topic-form{gap:8px;margin-bottom:16px;display:flex}.topic-form input{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:10px;flex:1;padding:12px 14px;font-size:15px}button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:12px 16px;font-size:15px;font-weight:600}button:disabled{opacity:.5;cursor:default}.photo-round{border:1px dashed var(--line);border-radius:12px;flex-direction:column;align-items:flex-start;gap:10px;margin-bottom:20px;padding:16px;display:flex}.preview{border:1px solid var(--line);border-radius:10px;max-width:100%;max-height:220px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;margin-top:8px;padding:24px}.question-header{justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;display:flex}.question{flex:1;margin:0;font-size:20px;line-height:1.4}.hint-button{border:1px solid var(--accent);color:var(--accent);background:0 0;flex-shrink:0;padding:8px 12px}.hint-button:hover:not(:disabled){background:#6c63ff14}.options{gap:10px;display:grid}.option{text-align:left;border:1px solid var(--line);background:#23253c}.option.correct{background:var(--green);border-color:var(--green)}.option.wrong{background:var(--red);border-color:var(--red)}.result{margin:16px 0 0;font-weight:600}.hint-callout{border-left:4px solid var(--accent);background:#6c63ff14;border-radius:4px 8px 8px 4px;margin-top:12px;padding:12px 14px;font-size:14px;line-height:1.4}.hint-callout strong{color:var(--accent);margin-bottom:4px;display:block}.fun-fact{border-left:4px solid var(--accent);background:#6c63ff14;border-radius:4px 8px 8px 4px;margin-top:12px;padding:12px 14px;font-size:14px;line-height:1.4}.fun-fact strong{color:var(--accent);margin-bottom:4px;display:block}.error{border:1px solid var(--red);color:#ffb3ba;background:#e848551f;border-radius:10px;padding:12px 14px}.photo-round input[type=file]{max-width:100%;color:var(--muted);font-size:14px}.photo-round input[type=file]::file-selector-button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;margin-right:12px;padding:10px 16px;font-size:14px;font-weight:600}.photo-round input[type=file]::file-selector-button:hover{opacity:.9}