:root{--bg: #0d1117;--surface: #161c26;--surface-2: #1d2430;--line: #262f3d;--text: #e9eef7;--muted: #93a1b8;--accent: #4da3ff;--ok: #3ddc97;--bad: #ff5d5d;--radius: 16px;color-scheme:dark;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;-webkit-text-size-adjust:100%}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);overscroll-behavior:none}button{font:inherit;color:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}.app{height:100dvh;max-width:430px;margin:0 auto;display:flex;flex-direction:column;background:var(--bg);padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}.screen{flex:1;min-height:0;display:flex;flex-direction:column}.scroll{flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch}.topbar{display:flex;align-items:center;gap:12px;padding:10px 16px;border-bottom:1px solid var(--line)}.topbar__back{background:none;border:none;padding:8px;margin-left:-8px;color:var(--muted);font-size:20px;line-height:1}.topbar__title{font-size:15px;font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topbar__counter{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}.progress{height:3px;background:var(--line)}.progress__bar{height:100%;background:var(--accent);transition:width .35s ease}.home{flex:1;display:flex;flex-direction:column;justify-content:center;gap:28px;padding:32px 22px}.home__badge{display:inline-block;align-self:flex-start;padding:6px 12px;border-radius:999px;background:#4da3ff24;color:var(--accent);font-size:12px;font-weight:600;letter-spacing:.02em}.home__title{font-size:32px;line-height:1.15;margin:0;letter-spacing:-.02em}.home__lead{margin:0;color:var(--muted);font-size:16px;line-height:1.5}.home__steps{list-style:none;margin:0;padding:0;display:grid;gap:10px}.home__steps li{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:15px}.home__steps span{width:26px;height:26px;flex:none;border-radius:50%;background:var(--surface-2);color:var(--text);display:grid;place-items:center;font-size:13px;font-weight:600}.lessons{padding:18px 16px 28px;display:grid;gap:12px}.lessons__group{display:flex;flex-direction:column;gap:10px}.lessons__group+.lessons__group{margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}.lessons__note{margin:-8px 0 0;font-size:12px;line-height:1.4;color:var(--muted)}.lessons__heading{margin:0 0 -4px;font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.lesson-card{width:100%;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;display:grid;gap:6px;transition:transform .12s ease,border-color .12s ease}.lesson-card:active{transform:scale(.985);border-color:var(--accent)}.lesson-card__top{display:flex;align-items:center;justify-content:space-between;gap:10px}.lesson-card__title{font-size:17px;font-weight:600}.lesson-card__term{font-size:12px;color:var(--accent);background:#4da3ff1f;border-radius:999px;padding:4px 10px;white-space:nowrap}.lesson-card__sub{color:var(--muted);font-size:14px;line-height:1.45}.lesson-card__meta{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-top:4px}.lesson-card__done{color:var(--ok)}.scenario{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}.scenario__brief{padding:9px 16px 8px;font-size:13.5px;line-height:1.4;color:var(--muted)}.scenario__brief b{color:var(--text);font-weight:600}.stage{position:relative;flex:1 1 auto;min-height:240px;margin:0 12px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#0f141c}.stage__svg{position:absolute;inset:0;width:100%;height:100%;display:block}.stage__replay{position:absolute;right:10px;bottom:10px;background:#0d1117b8;border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:13px;color:var(--text);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.panel{flex:0 1 auto;min-height:0;max-height:46%;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:14px 16px calc(18px + env(safe-area-inset-bottom));display:grid;gap:10px;align-content:start}.question{font-size:16px;font-weight:600;line-height:1.3;margin:0}.answers{display:grid;gap:6px}.answer{min-height:46px;width:100%;text-align:left;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface);font-size:14.5px;line-height:1.3;transition:background .15s ease,border-color .15s ease,opacity .15s ease}.answer:active:not(:disabled){background:var(--surface-2)}.answer:disabled{cursor:default}.answer--dimmed{opacity:.4}.answer--chosen{border-color:var(--accent);background:var(--surface-2)}.answer--correct{border-color:var(--ok);background:#3ddc971f}.answer--wrong{border-color:var(--bad);background:#ff5d5d1f}.answer__mark{float:right;margin-left:10px;font-size:16px}.status{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted);min-height:20px}.status__dot{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{opacity:.35}50%{opacity:1}}.result{display:grid;gap:12px;animation:rise .28s ease both}@keyframes rise{0%{opacity:0;transform:translateY(10px)}}.verdict{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:600}.verdict--ok{color:var(--ok)}.verdict--bad{color:var(--bad)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 15px;display:grid;gap:8px}.card__label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.card__text{font-size:14.5px;line-height:1.55;margin:0}.card--note{background:#f2b13414;border-color:#f2b13447}.card--note .card__label{color:#f2b134}.source{display:flex;flex-wrap:wrap;gap:6px;font-size:12px;color:var(--muted)}.source__ref{padding:3px 8px;border:1px solid var(--line);border-radius:999px;white-space:nowrap}.primary{width:100%;min-height:54px;border:none;border-radius:14px;background:var(--accent);color:#071018;font-size:16px;font-weight:600}.primary:active{filter:brightness(.92)}.secondary{width:100%;min-height:48px;border-radius:14px;border:1px solid var(--line);background:transparent;color:var(--muted);font-size:15px}.done{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:14px;padding:32px 22px;text-align:center}.done__icon{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;background:#3ddc9724;color:var(--ok);font-size:28px}.done__title{margin:0;font-size:22px}.done__score{color:var(--muted);font-size:15px;margin:0}.done__actions{display:grid;gap:10px;width:100%;margin-top:10px}.langswitch{display:flex;gap:2px;flex:none;background:var(--surface-2);border-radius:999px;padding:2px}.langswitch__btn{border:none;background:none;border-radius:999px;padding:3px 7px;font-size:15px;line-height:1;filter:grayscale(1) opacity(.5);transition:filter .15s ease,background .15s ease}.langswitch__btn--on{background:var(--surface);filter:none}.terms{border:1px solid var(--line);border-radius:12px;padding:9px 12px;display:grid;gap:5px;background:var(--surface)}.terms--lead{margin:0 12px 6px;padding:7px 11px;gap:3px;border-color:#4da3ff59;background:#4da3ff12}.terms--lead .terms__list{display:flex;flex-wrap:wrap;gap:3px 14px}.terms--lead .terms__row{font-size:12.5px}.terms__label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.terms__list{margin:0;display:grid;gap:3px}.terms__row{display:flex;flex-wrap:wrap;gap:6px;font-size:13.5px;line-height:1.35}.terms__row dt{font-weight:600;color:var(--text)}.terms__row dd{margin:0;color:var(--muted)}.terms__note{font-size:11.5px;color:var(--muted)}