:root{--tg-bg: #ffffff;--tg-text: #000000;--tg-hint: #999999;--tg-button: #2ea6ff;--tg-button-text: #ffffff;--tg-secondary-bg: #f1f1f1}*{box-sizing:border-box}html,body,#app{margin:0;padding:0;height:100%}body{background:var(--tg-bg);color:var(--tg-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px}.app{display:flex;flex-direction:column;min-height:100vh;padding-bottom:64px}.content{flex:1;padding:16px}.center{display:flex;align-items:center;justify-content:center;min-height:60vh;text-align:center;color:var(--tg-hint);flex-direction:column;gap:12px;padding:24px}h2{font-size:18px;margin:0 0 12px}.card{background:var(--tg-secondary-bg);border-radius:14px;padding:16px;margin-bottom:12px}.question{font-size:18px;font-weight:600;margin-bottom:20px;line-height:1.4}.btn{display:block;width:100%;border:none;border-radius:12px;padding:14px 16px;font-size:16px;background:var(--tg-button);color:var(--tg-button-text);cursor:pointer;margin-bottom:10px;text-align:center}.btn:disabled{opacity:.5;cursor:default}.btn.secondary{background:var(--tg-secondary-bg);color:var(--tg-text)}.option{display:block;width:100%;text-align:left;border:1.5px solid transparent;border-radius:12px;padding:14px 16px;font-size:16px;background:var(--tg-secondary-bg);color:var(--tg-text);cursor:pointer;margin-bottom:10px}.option.correct{border-color:#2ecc71;background:#2ecc7126}.option.wrong{border-color:#e74c3c;background:#e74c3c26}.option:disabled{cursor:default}.row{display:flex;gap:10px;align-items:center}.row .grow{flex:1}.chip{border:none;border-radius:999px;padding:8px 14px;font-size:14px;background:var(--tg-secondary-bg);color:var(--tg-text);cursor:pointer;white-space:nowrap}.chip.active{background:var(--tg-button);color:var(--tg-button-text)}.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:12px}input,select,textarea{width:100%;border:1px solid var(--tg-hint);border-radius:10px;padding:12px;font-size:16px;background:var(--tg-bg);color:var(--tg-text);margin-bottom:12px}label{display:block;font-size:14px;color:var(--tg-hint);margin-bottom:6px}.tabbar{position:fixed;bottom:0;left:0;right:0;display:flex;background:var(--tg-bg);border-top:1px solid var(--tg-secondary-bg)}.tab{flex:1;border:none;background:none;color:var(--tg-hint);padding:10px 4px;font-size:12px;cursor:pointer}.tab.active{color:var(--tg-button)}.tab .ico{font-size:20px;display:block}.hint{color:var(--tg-hint);font-size:14px}.badge{display:inline-block;background:var(--tg-button);color:var(--tg-button-text);border-radius:999px;padding:2px 8px;font-size:12px;margin-left:6px}.error{color:#e74c3c}