:root{--bg:var(--tg-bg,#fff);--text:var(--tg-text,#16181d);--hint:var(--tg-hint,#5f6672);--surface:var(--tg-surface,#f2f4f8);--accent:var(--tg-button,#2563eb);--accent-text:var(--tg-button-text,#fff);--border:#cfd5df;--ok:#0f7a3d;--bad:#b3261e;--warn:#8a5a00;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}:root:not([style*=--tg-bg]){--bg:#14161a;--text:#eceef2;--hint:#a2a9b5;--surface:#1f232a;--accent:#5b8def;--border:#3a4150;--ok:#52c17f;--bad:#ff8a80;--warn:#e5b25a}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);padding:env(safe-area-inset-top) env(safe-area-inset-right) 0 env(safe-area-inset-left);margin:0;font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}main{max-width:640px;padding:12px 16px calc(96px + env(safe-area-inset-bottom));margin:0 auto}h1{margin:0;font-size:1.35rem}h2{margin:20px 0 8px;font-size:1.1rem}h3{margin:0 0 6px}p{overflow-wrap:anywhere;margin:8px 0}.muted{color:var(--hint)}.small{font-size:.875rem}.center{text-align:center;padding:40px 16px}.error{color:var(--bad);font-weight:600}a{color:var(--accent)}code{background:var(--surface);border-radius:4px;padding:1px 6px}button,.card{font:inherit;color:inherit}button{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:10px;min-width:44px;min-height:44px;padding:8px 14px}button:disabled{opacity:.5;cursor:not-allowed}button.primary{background:var(--accent);color:var(--accent-text);border-color:#0000;font-weight:600}button.link{color:var(--accent);background:0 0;border:none;padding:8px 4px;text-decoration:underline}button.toggle[aria-pressed=true]{background:var(--accent);color:var(--accent-text)}input[type=text],input[type=date],input[type=search],textarea,select{border:1px solid var(--border);background:var(--bg);width:100%;min-height:44px;color:var(--text);border-radius:10px;padding:8px 10px;font-size:16px}textarea{resize:vertical;min-height:260px}label{margin:10px 0;font-weight:600;display:block}label input{margin-top:4px;font-weight:400}:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.app-head{justify-content:space-between;align-items:center;gap:8px;display:flex}.app-head nav{display:flex}.card{text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:12px;flex-direction:column;align-items:flex-start;gap:2px;width:100%;min-height:44px;margin:8px 0;padding:12px 14px;display:flex}.card span{color:var(--hint);font-size:.9rem}.primary-card{background:var(--accent);color:var(--accent-text)}.primary-card span{color:inherit;opacity:.85}.panel{background:var(--surface);border-radius:12px;margin:12px 0;padding:14px 16px}.overlay{z-index:10;background:#0000008c;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.overlay .panel{background:var(--bg);width:100%;max-width:420px}.lesson-head{justify-content:space-between;align-items:center;gap:8px;display:flex}progress{width:100%;height:6px}.question .meta{margin:8px 0 0}.prompt{white-space:pre-line;font-size:1.05rem}.badge{background:var(--surface);border-radius:999px;margin-left:8px;padding:1px 8px}.badge.warn{color:var(--warn);border:1px solid var(--warn)}fieldset.choices{border:0;min-width:0;margin:12px 0;padding:0}fieldset.choices legend{color:var(--hint);margin-bottom:4px;font-weight:600}.choice{border:1px solid var(--border);border-radius:10px;align-items:center;gap:12px;min-height:44px;margin:6px 0;padding:8px 12px;font-weight:400;display:flex}.choice input{flex:none;width:22px;height:22px;margin:0}.choice:has(input:checked){border-color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, transparent)}.save-status{min-height:1.5em;color:var(--hint);font-size:.9rem}.save-status.not-saved,.save-status.conflict{color:var(--bad);font-weight:600}.sticky-actions{padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:var(--bg);border-top:1px solid var(--border);z-index:3;justify-content:center;display:flex;position:fixed;bottom:0;left:0;right:0}.sticky-actions button{width:100%;max-width:608px}.actions{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.actions button{flex:140px}.feedback{border-left:6px solid var(--border);background:var(--surface);border-radius:10px;margin:16px 0;padding:12px 14px}.feedback.right{border-color:var(--ok)}.feedback.right h3{color:var(--ok)}.feedback.wrong{border-color:var(--bad)}.feedback.wrong h3{color:var(--bad)}.explanation{white-space:pre-line}.hint,.conflict{background:var(--surface);border-radius:10px;padding:10px 12px}.pager{justify-content:space-between;margin-top:12px;display:flex}ul.topics,ul.results{padding:0;list-style:none}ul.topics li{border-bottom:1px solid var(--border);flex-direction:column;padding:10px 0;display:flex}.footer{margin-top:28px}@media (width<=360px){main{padding-left:12px;padding-right:12px}}.help-actions{flex-direction:column;align-items:flex-start;display:flex}.help-form{margin-top:8px}.worked-example p{line-height:1.55}.context{border-left:3px solid var(--accent);background:var(--surface);color:var(--text);margin:0 0 .75rem;padding:.6rem .75rem}.context p{margin:0}.context-label{margin-bottom:.25rem;font-weight:600}.voice-slot{margin:.5rem 0}.qc-grid{grid-template-columns:1fr 1fr;gap:8px;margin:12px 0;display:grid}.qc-grid div{background:var(--surface);border-radius:10px;flex-direction:column;gap:4px;padding:10px 12px;display:flex}.qc-title{color:var(--hint);margin:8px 0 0;font-size:.95rem}.reading{border:1px solid var(--border);background:var(--surface);z-index:2;border-radius:12px;max-height:38vh;margin:8px 0;padding:4px 14px;position:sticky;top:0;overflow-y:auto}.reading h2{margin-top:8px}.numeric{flex-wrap:wrap;align-items:flex-end;gap:8px;margin:12px 0;display:flex}.numeric label{flex:140px;margin:0}.numeric.fraction label{flex:0 100px}.numeric .bar{padding-bottom:6px;font-size:1.6rem}.numeric .unit{padding-bottom:10px}.numeric p{flex-basis:100%;margin:0}.exhibit{margin:12px 0}.exhibit figcaption{margin-bottom:4px;font-weight:600}.table-scroll{overflow-x:auto}.exhibit table{border-collapse:collapse;width:100%}.exhibit th,.exhibit td{border:1px solid var(--border);text-align:left;padding:6px 8px}.bar-0{fill:var(--accent);background:var(--accent)}.bar-1{fill:#e08a1e;background:#e08a1e}.swatch{border-radius:2px;width:12px;height:12px;margin-right:4px;display:inline-block}.legend span{margin-right:12px}@media (width<=480px){.qc-grid{grid-template-columns:1fr}}.essay-review ul{margin:4px 0 8px;padding-left:1.2rem}.essay-review li{overflow-wrap:anywhere}.essay-note{color:var(--hint);font-size:.85rem}.gap-item{overflow-wrap:anywhere;line-height:2.2}.gap-item input{width:9.5em;max-width:100%;font:inherit;text-align:center;border:none;border-bottom:2px solid var(--border);color:var(--text);background:0 0;margin:0 2px;padding:2px 6px}.gap-item input:focus{border-bottom-color:var(--accent);outline:none}.gap-item .hint{color:var(--hint);background:0 0;padding:0;font-size:.9rem}.accent-note{color:var(--warn)}.w{cursor:pointer;border-radius:3px}.w:hover,.w.on{background:color-mix(in srgb, var(--warn) 20%, transparent)}#pop{z-index:10;background:var(--bg);max-width:min(320px,100vw - 16px);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:10px 14px;font-size:.95rem;line-height:1.45;position:absolute;box-shadow:0 6px 24px #0000002e}#pop .es{font-size:1.05rem;font-weight:700}#pop .lang{color:var(--hint);width:22px;font-size:.75rem;display:inline-block}#pop .note{color:var(--hint);margin-top:4px}.worksheet,.writing{margin-top:20px}.link-card{flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0;display:flex}.writing textarea{resize:vertical;width:100%;font:inherit;border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:8px;padding:8px;display:block}.writing-text{white-space:pre-wrap;overflow-wrap:anywhere}.writing-review{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}.worksheet details{margin:12px 0}.worksheet table{border-collapse:collapse;width:100%;font-size:.95rem}.worksheet th,.worksheet td{border-bottom:1px solid var(--border);text-align:left;padding:4px 8px}.vocab input{width:100%;max-width:18em;font:inherit;border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:8px;margin:6px 0 12px;padding:6px 8px;display:block}.kata-intro p,.kata-msg p,.kata-review p,.kata-review li{white-space:pre-wrap;overflow-wrap:anywhere}.kata-thread{flex-direction:column;gap:8px;margin:12px 0;display:flex}.kata-msg{background:var(--surface);border-radius:12px;max-width:92%;padding:8px 12px}.kata-msg p{margin:2px 0 0}.kata-msg.andrey{border:1px solid var(--accent);align-self:flex-end}.kata-msg strong{color:var(--hint);font-size:.8rem}.kata-runs{margin:4px 0 0;padding:0;list-style:none}.kata-runs li{overflow-wrap:anywhere;margin:4px 0}.kata-score{font-size:1.2rem;font-weight:700}.kata-field textarea{min-height:120px}.kata-review ul{padding-left:1.2rem}.kata-theme h4{margin:8px 0 2px}.table-wrap{max-width:100%;overflow-x:auto}.table-wrap table{border-collapse:collapse;width:100%;min-width:0}.table-wrap th,.table-wrap td{text-align:left;vertical-align:top;border-bottom:1px solid var(--border);overflow-wrap:anywhere;padding:6px 8px}ul.results li{overflow-wrap:anywhere;padding:6px 0}.course-card h2{margin:0;font-size:1.1rem}.course-card p{margin:0}.row{flex-wrap:wrap;gap:8px;margin-top:6px;display:flex}.panel:has(>table.compare){overflow-x:auto}table.compare{border-collapse:collapse;width:100%;font-size:.9rem}table.compare th,table.compare td{text-align:left;vertical-align:top;border-bottom:1px solid var(--border,#7f7f7f4d);padding:.4rem .5rem}