:root{--bg:#eef2f7;--card:#fff;--ink:#14213d;--mut:#5b6784;--acc:#f2b705;--ok:#23915a;--bad:#c8102e;--line:#d5dce8}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0d1526;--card:#16213a;--ink:#eef2f7;--mut:#9aa7c4;--line:#2a3757}}
:root[data-theme="dark"]{--bg:#0d1526;--card:#16213a;--ink:#eef2f7;--mut:#9aa7c4;--line:#2a3757}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Bricolage Grotesque',system-ui,sans-serif;line-height:1.5;
  padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
main{max-width:560px;margin:0 auto;padding:16px}
h1{font-size:28px;font-weight:800;margin:8px 0 4px;letter-spacing:-.5px}
.sub{color:var(--mut);margin:0 0 14px}
.bar{height:6px;background:linear-gradient(90deg,#000 0 33%,#c8102e 33% 66%,var(--acc) 66%);border-radius:3px;margin-bottom:14px}
.tabs{display:flex;gap:6px;margin-bottom:12px;overflow-x:auto;flex-wrap:nowrap;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.tabs button{flex:0 0 auto;font-weight:600;padding:8px 12px;font-size:14px;white-space:nowrap}
button{font:inherit;cursor:pointer;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:10px;padding:8px 14px}
button:focus-visible{outline:3px solid var(--acc)}
button.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
button:disabled{opacity:.5;cursor:default}
.chips button{padding:4px 12px;border-radius:99px;font-size:14px}
.chips button.on{background:var(--acc);color:#14213d;border-color:var(--acc)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;text-align:center;min-height:250px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:6px}
.emo{font-size:72px;line-height:1}
.de{font-size:34px;font-weight:800}
.ru{font-size:24px;color:var(--mut)}
.art{color:var(--bad)}
.tp{font-size:20px;color:var(--mut);font-style:italic}
.ex{background:var(--bg);border-radius:8px;padding:6px 10px;margin:4px 0!important}
.tr2{color:var(--mut)}
.lv{font-size:13px;color:var(--mut)}
.row{display:flex;gap:8px;margin-top:12px}
.row button{flex:1;padding:12px;font-weight:600}
.good{background:var(--ok);color:#fff;border-color:var(--ok)}
.again{background:var(--bad);color:#fff;border-color:var(--bad)}
.opts{display:grid;gap:8px;width:100%;margin-top:10px}
.opts button{padding:12px;font-size:18px}
.opts .right{background:var(--ok);color:#fff;border-color:var(--ok)}
.opts .wrong{background:var(--bad);color:#fff;border-color:var(--bad)}
.stat{color:var(--mut);font-size:14px;margin-top:10px;text-align:center}
.txt{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;margin-bottom:12px}
.txt h3{margin:0 0 6px}.txt p{margin:6px 0}
.tr{color:var(--mut);display:none}.txt.open .tr{display:block}
.sp{font-size:20px;padding:4px 10px;margin-top:6px}
.translate-box{display:flex;flex-direction:column;gap:10px}
.translate-box textarea{width:100%;min-height:90px;padding:12px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-size:18px;resize:vertical}
.translate-result{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;font-size:22px;min-height:60px}
.translate-result.pending{color:var(--mut);font-size:16px}
.swaprow{display:flex;align-items:center;justify-content:center;gap:10px}
.spinner{display:inline-block;width:14px;height:14px;border-radius:50%;border:2px solid var(--line);border-top-color:var(--acc);animation:spin .7s linear infinite;margin-right:6px;vertical-align:-2px}
@keyframes spin{to{transform:rotate(360deg)}}
#micBtn.again{animation:pulse 1.1s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.6}}
.offline-banner{background:var(--bad);color:#fff;border-radius:10px;padding:8px 12px;margin-bottom:12px;font-size:14px;text-align:center}

/* AI conversation partner */
.bub{padding:10px 12px;border-radius:14px;margin:8px 0;max-width:88%;line-height:1.4;white-space:pre-wrap;word-break:break-word}
.bub.me{background:var(--acc);color:#14213d;margin-left:auto}
.bub.ai{background:var(--bg);border:1px solid var(--line)}
.bub .sp{margin-left:6px;padding:2px 8px}
.bub .bhint{color:var(--mut);font-style:italic}
.bub .btr{color:var(--mut);font-size:14px}
.bub .bfix{color:#b45309;font-size:14px}
.bopts{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.bopts button{padding:6px 12px}
/* language switch: the active language is highlighted */
#langBtn{padding:6px 6px}
#langBtn .lg{display:inline-block;padding:3px 7px;margin:0 1px;border-radius:7px;color:var(--mut);font-weight:600}
#langBtn .lg.on{background:var(--acc);color:#14213d;font-weight:800}