:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--bg:#f4f6f8;--surface:#fff;--text:#1b1f24;--muted:#4b5563;--border:#b8c0cc;--accent:#1d4ed8;--accent-hover:#1e40af;--accent-text:#fff;--secondary-bg:transparent;--secondary-text:#1d4ed8;--focus:#1d4ed8;--danger:#a4170d;--danger-bg:#fdecea;--notice-bg:#eaf1ff;--notice-border:#9db8f5}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--bg:#0f1419;--surface:#18202a;--text:#e8edf2;--muted:#aab4bf;--border:#4a5663;--accent:#8ab0ff;--accent-hover:#a9c4ff;--accent-text:#0b1220;--secondary-bg:transparent;--secondary-text:#8ab0ff;--focus:#8ab0ff;--danger:#ffb4ab;--danger-bg:#3b1613;--notice-bg:#172338;--notice-border:#3d5a8c}}*,:before,:after{box-sizing:border-box}body{background:var(--bg);color:var(--text);overflow-wrap:anywhere;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.5}h1,h2{line-height:1.25}h1{margin:0 0 .75rem;font-size:1.75rem}h2{margin:0 0 .5rem;font-size:1.05rem}p{margin:0 0 1rem}:focus-visible{outline:3px solid var(--focus);outline-offset:2px}.page{align-content:start;justify-items:center;min-height:100dvh;padding:1rem;display:grid}.page--centered{text-align:center;align-content:center}.card{background:var(--surface);border:1px solid var(--border);border-radius:.75rem;width:100%;max-width:34rem;margin-top:1rem;padding:1.25rem}.notice{background:var(--notice-bg);border:1px solid var(--notice-border);border-radius:.5rem;margin:0 0 1.25rem;padding:.75rem 1rem}.notice ul{margin:0;padding-left:1.25rem}.notice li+li{margin-top:.5rem}.field{gap:.375rem;margin-bottom:1rem;display:grid}.field label{font-weight:600}.field input,.field select,.field textarea{background:var(--surface);width:100%;min-width:0;min-height:2.75rem;color:var(--text);border:1px solid var(--border);font:inherit;border-radius:.5rem;padding:.5rem .75rem;font-size:1rem}.field textarea{resize:vertical;min-height:7rem;line-height:1.4}.field input[aria-invalid=true],.field select[aria-invalid=true],.field textarea[aria-invalid=true]{border-color:var(--danger)}.button{background:var(--accent);min-height:2.75rem;color:var(--accent-text);border:1px solid var(--accent);font:inherit;cursor:pointer;border-radius:.5rem;justify-content:center;align-items:center;padding:.5rem 1.25rem;font-weight:600;text-decoration:none;display:inline-flex}.button:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.button:disabled{opacity:.7;cursor:progress}.button--secondary{background:var(--secondary-bg);color:var(--secondary-text);border-color:var(--secondary-text)}.button--secondary:hover:not(:disabled){background:var(--notice-bg);border-color:var(--secondary-text)}.login-form .button{width:100%}.form-error{background:var(--danger-bg);color:var(--danger);border:1px solid var(--danger);border-radius:.5rem;margin:0 0 1rem;padding:.625rem .75rem;font-weight:600}.start{width:100%;max-width:34rem}.logout{margin-top:1.5rem}.logout .form-error{text-align:left;margin-top:1rem}.card--wide{max-width:40rem}.back-link{margin:0 0 .75rem}.back-link a,.settings a{color:var(--accent)}.conversation-form .button[type=submit]{width:100%}.field-hint{color:var(--muted);margin:0;font-size:.9rem}.field-error{color:var(--danger);margin:0;font-size:.95rem;font-weight:600}.field+.field-hint,.notice+.field-hint{margin-top:0}.conversation-form>.field-hint{margin-bottom:1rem}.button--small{justify-self:start;min-height:2.25rem;padding:.25rem .875rem;font-size:.9rem}.notice--warning{background:var(--danger-bg);border-color:var(--danger)}.settings{margin:0 0 1.25rem}.settings>div{border-top:1px solid var(--border);padding:.5rem 0}.settings dt{font-weight:600}.settings dd{margin:.125rem 0 0}.preline{white-space:pre-line}.card--wide h1{font-size:1.5rem}:root{--danger-solid:#a4170d;--danger-solid-hover:#8a1209;--danger-solid-text:#fff;--user-bg:#eaf1ff;--teacher-bg:#f0f2f5}@media (prefers-color-scheme:dark){:root{--danger-solid:#ffb4ab;--danger-solid-hover:#ffcdc7;--danger-solid-text:#3b1613;--user-bg:#172338;--teacher-bg:#202a36}}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.start__actions,.conversation-actions,.history__actions,.confirm__actions{flex-wrap:wrap;gap:.5rem;display:flex}.start__actions{justify-content:center}.conversation-actions{align-items:flex-start;margin-top:1.25rem}.button--danger{background:var(--danger-solid);color:var(--danger-solid-text);border-color:var(--danger-solid)}.button--danger:hover:not(:disabled){background:var(--danger-solid-hover);border-color:var(--danger-solid-hover)}.confirm{background:var(--danger-bg);border:1px solid var(--danger);border-radius:.5rem;flex:100%;padding:.75rem 1rem}.confirm h2{margin-bottom:.25rem}.history{gap:.75rem;margin:0 0 1rem;padding:0;list-style:none;display:grid}.history__item{border:1px solid var(--border);border-radius:.5rem;padding:.75rem 1rem}.history__item h2{margin-bottom:.25rem;font-size:1.1rem}.history__item h2 a{color:var(--accent)}.history__meta{color:var(--muted);margin:0 0 .25rem;font-size:.95rem}.history__actions{margin-top:.5rem}.badge{border:1px solid var(--border);color:var(--text);border-radius:999px;padding:0 .5rem;font-weight:600;display:inline-block}.badge--active{border-color:var(--notice-border);background:var(--notice-bg)}.transcript{gap:.5rem;margin:0 0 1rem;padding:0;list-style:none;display:grid}.message{border-radius:.5rem;padding:.5rem .75rem}.message--user{background:var(--user-bg)}.message--assistant{background:var(--teacher-bg)}.message__meta{color:var(--muted);margin:0 0 .125rem;font-size:.9rem}.message__meta strong{color:var(--text)}.message__text{margin:0}.settings-details{border:1px solid var(--border);border-radius:.5rem;margin:0 0 1rem}.settings-details>summary{cursor:pointer;min-height:2.75rem;padding:.625rem .75rem;font-weight:600}.settings-details>.settings{margin:0;padding:0 .75rem .5rem}.lesson .transcript{margin-bottom:.75rem}.message__missing{color:var(--muted);margin:.5rem 0 0;font-size:.9rem}.message--pending{opacity:.75}.message--waiting .message__text{align-items:center;gap:.5rem;display:flex}.dots{gap:.25rem;display:inline-flex}.dots span{background:var(--muted);border-radius:50%;width:.4rem;height:.4rem;animation:1.2s ease-in-out infinite dots-pulse}.dots span:nth-child(2){animation-delay:.2s}.dots span:nth-child(3){animation-delay:.4s}@keyframes dots-pulse{0%,80%,to{opacity:.25}40%{opacity:1}}@media (prefers-reduced-motion:reduce){.dots span{opacity:.6;animation:none}}.composer{z-index:1;background:var(--surface);border-top:1px solid var(--border);margin:0 -.25rem;padding:.75rem .25rem .5rem;position:sticky;bottom:0}.composer--static{position:static}@media (max-height:600px){.composer{position:static}}.composer .field{margin-bottom:.5rem}.composer .button[type=submit]{width:100%}.field textarea[readonly]{opacity:.75}.lesson__finish,.lesson .confirm{margin-top:1rem}.lesson .notice h2{margin-bottom:.25rem}.lesson .notice .button{margin-top:.25rem}.check{align-items:flex-start;gap:.5rem;display:flex}.check input{flex:none;width:1.25rem;height:1.25rem;margin-top:.2rem}.cost{border:1px solid var(--border);background:var(--surface);border-left-width:6px;border-radius:8px;margin-top:1rem;padding:.75rem 1rem}.cost--partial,.cost--pending,.cost--unknown{border-left-color:var(--accent);border-left-style:double}.cost h2{margin-bottom:.25rem}.cost h3{margin:1rem 0 .25rem;font-size:.95rem}.cost__headline{margin-bottom:.5rem}.cost__caveat{font-weight:600}.cost__details>summary{cursor:pointer;color:var(--secondary-text);align-items:center;min-height:2.75rem;padding:.25rem 0;display:flex}.cost__kinds{margin:0 0 .5rem;padding-left:1.25rem}.cost__kinds li+li{margin-top:.25rem}.cost__count,.cost-call__note{color:var(--muted)}.cost-calls{margin:0 0 1rem;padding:0;list-style:none}.cost-call{border:1px solid var(--border);border-radius:6px;margin:0 0 .75rem;padding:.5rem .75rem}.cost-call p{margin:0 0 .25rem}.cost-call__meta{color:var(--muted);font-size:.9rem}.cost-call__note{font-size:.9rem}.cost-call__rates{margin-top:.25rem;font-size:.9rem}.cost-call__rates>summary{cursor:pointer;color:var(--secondary-text);align-items:center;min-height:2.25rem;display:flex}.cost-call__rates ul{margin:.25rem 0;padding-left:1.25rem}.history__cost--partial,.history__cost--unknown,.history__cost--pending{color:var(--text)}.voice{border:1px solid var(--border);border-radius:8px;margin:0 0 .75rem;padding:.5rem .75rem}.voice .check{margin:0}.voice__actions{flex-wrap:wrap;gap:.5rem;margin-top:.5rem;display:flex}.voice .field-hint{margin:.4rem 0 0}.voice__status:empty{margin:0}.voice__modes{border:0;min-width:0;margin:0;padding:0}.voice__modes legend{padding:0;font-weight:600}.voice__options{flex-wrap:wrap;gap:.25rem 1.5rem;margin-top:.35rem;display:flex}.voice__option{flex:14rem}.voice__option .check{margin:0}.voice__hint{margin:.15rem 0 0 1.5rem}.voice__cost{margin-top:.5rem}.voice__picks{flex-wrap:wrap;gap:0 1.5rem;margin-top:.5rem;display:flex}.voice__pick{flex:16rem;min-width:0}.voice__pick .field{margin-bottom:.25rem}.voice__picks-note{flex-basis:100%}.voice__repeat-cost{margin-top:.35rem}.speech{border:1px solid var(--border);border-radius:8px;margin:0 0 .75rem;padding:.5rem .75rem}.speech__actions{flex-wrap:wrap;gap:.5rem;display:flex}.speech .field-hint{margin:.4rem 0 0}.speech__status:empty{margin:0}.speech__status--live{font-weight:600}.speech__problem{color:var(--danger)}.speech-mode{border:1px solid var(--border);border-radius:8px;min-width:0;margin:0 0 .75rem;padding:.5rem .75rem}.speech-mode legend{padding:0 .25rem;font-weight:600}.speech-mode__options{flex-wrap:wrap;gap:.25rem 1.5rem;display:flex}.speech-mode__option{flex:14rem}.speech-mode__option .check{margin:0}.speech-mode__hint{margin:.15rem 0 0 1.5rem}.recording__indicator{font-variant-numeric:tabular-nums;align-items:center;gap:.5rem;margin:.5rem 0 0;font-weight:600;display:flex}.recording__dot{background:var(--danger);border-radius:50%;width:.75rem;height:.75rem;animation:1.2s ease-in-out infinite recording-pulse}@keyframes recording-pulse{0%,to{opacity:1}50%{opacity:.3}}@media (prefers-reduced-motion:reduce){.recording__dot{animation:none}}