:root{--bg:var(--tg-theme-bg-color,#fff);--text:var(--tg-theme-text-color,#000);--hint:var(--tg-theme-hint-color,#707579);--button:var(--tg-theme-button-color,#3390ec);--button-text:var(--tg-theme-button-text-color,#fff);--secondary-bg:var(--tg-theme-secondary-bg-color,#f4f4f5);--ok:#2e9e5b;--bad:#d64545;--inset-top:max(env(safe-area-inset-top,0px), calc(var(--tg-viewport-safe-area-inset-top,0px) + var(--tg-viewport-content-safe-area-inset-top,0px)));--inset-bottom:max(env(safe-area-inset-bottom,0px), calc(var(--tg-viewport-safe-area-inset-bottom,0px) + var(--tg-viewport-content-safe-area-inset-bottom,0px)))}*{box-sizing:border-box}html{font-size:16px}body{background:var(--bg);color:var(--text);-webkit-text-size-adjust:100%;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.4}#root{min-height:100vh;padding:calc(var(--inset-top) + 16px) 16px calc(var(--inset-bottom) + 96px)}.screen{flex-direction:column;gap:12px;max-width:32rem;margin:0 auto;display:flex}.screen__title{color:var(--hint);margin:0;font-size:1rem;font-weight:500}.screen__header{margin:0;font-size:1.75rem;font-weight:700}.screen__text{margin:0;font-size:1.125rem}.forms{border-collapse:collapse;background:var(--secondary-bg);border-radius:12px;width:100%;overflow:hidden}.forms__subject,.forms__value{text-align:left;padding:12px 16px;font-size:1.25rem}.forms__subject{color:var(--hint);white-space:nowrap;font-weight:400}.forms__value{font-weight:600}.bottom-action{padding:12px 16px calc(var(--inset-bottom) + 12px);background:var(--bg);position:fixed;bottom:0;left:0;right:0}.bottom-action__button{background:var(--button);width:100%;max-width:32rem;min-height:52px;color:var(--button-text);font:inherit;border:0;border-radius:12px;margin:0 auto;font-size:1.125rem;font-weight:600;display:block}.bottom-action__button:disabled{opacity:.5}.exercise__prompt{overflow-wrap:anywhere;margin:0;font-size:1.75rem;font-weight:700}.options{grid-template-columns:1fr 1fr;gap:12px;display:grid}.option{background:var(--secondary-bg);min-height:56px;color:var(--text);font:inherit;overflow-wrap:anywhere;border:2px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:10px 12px;font-size:1.375rem;font-weight:600;display:flex}.option:disabled{opacity:1}.option--correct{border-color:var(--ok);background:color-mix(in srgb, var(--ok) 18%, var(--secondary-bg))}.option--wrong{border-color:var(--bad);background:color-mix(in srgb, var(--bad) 18%, var(--secondary-bg))}.option__mark{font-size:1.125rem}.verdict{margin:4px 0 var(--inset-bottom);border-left:4px solid var(--hint);background:var(--secondary-bg);border-radius:12px;padding:14px 16px;animation:.2s ease-out verdict-in}.verdict--correct{border-left-color:var(--ok)}.verdict--wrong{border-left-color:var(--bad)}.verdict__headline,.verdict__chosen{margin:0}.verdict__headline{font-size:1.25rem;font-weight:600}.verdict__chosen{color:var(--hint);margin-top:4px}@keyframes verdict-in{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.verdict{animation:none}}.screen--gate{text-align:center;justify-content:center;min-height:60vh}.notice{background:var(--secondary-bg);max-width:32rem;color:var(--text);border-radius:12px;margin:0 auto 12px;padding:10px 14px}.typed{flex-direction:column;gap:8px;display:flex}.typed form{margin:0}.typed__input{border:2px solid var(--secondary-bg);background:var(--secondary-bg);width:100%;min-height:52px;color:var(--text);font:inherit;border-radius:12px;padding:10px 14px;font-size:1.375rem;font-weight:600;display:block}.typed__input:focus{border-color:var(--button);outline:none}.typed__input:read-only{border-color:#0000}.typed__hint{color:var(--bad);margin:0}.verdict--almost{border-left-color:#d9a000}.strip{grid-template-columns:repeat(5,1fr);gap:8px;display:grid}.strip__key{background:var(--secondary-bg);min-width:44px;min-height:48px;color:var(--text);font:inherit;touch-action:manipulation;-webkit-user-select:none;user-select:none;border:0;border-radius:10px;padding:0;font-size:1.375rem;font-weight:600}.strip__key:active{background:color-mix(in srgb, var(--button) 25%, var(--secondary-bg))}.strip__key:disabled{opacity:.5}.clarify{flex-direction:column;gap:12px;display:flex}.clarify__question{white-space:pre-line;margin:0;font-size:1.125rem}.clarify__options{grid-template-columns:1fr 1fr;gap:12px;display:grid}.verdict__explain{color:var(--hint);margin:4px 0 0}