:root{
  color-scheme: light dark;
  --navy:#1B3A57; --slate:#374852; --green:#3D7A5E; --amber:#A46F2E;
  --bg:#f2f3f5; --card:#ffffff; --text:#13202b; --muted:#5d6b76; --line:#e1e4e8;
  --safe-top: env(safe-area-inset-top); --safe-bot: env(safe-area-inset-bottom);
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0e1418; --card:#19232b; --text:#eef2f5; --muted:#9fb0bc; --line:#27343d; }
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent;}
html,body{margin:0;height:100%;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  background:var(--bg); color:var(--text);
  overscroll-behavior-y:none;
}
#app{min-height:100%;}

/* верхняя панель */
.topbar{
  position:sticky; top:0; z-index:10;
  background:var(--navy); color:#fff;
  padding:calc(var(--safe-top) + 10px) 14px 12px;
  display:flex; align-items:center; gap:10px;
  box-shadow:0 1px 0 rgba(0,0,0,.15);
}
.topbar h1{font-size:18px;margin:0;font-weight:700;flex:1;line-height:1.2;}
.topbar .sub{font-size:12px;opacity:.8;font-weight:400;display:block;}
.iconbtn{
  background:rgba(255,255,255,.16); border:0; color:#fff;
  width:38px;height:38px;border-radius:12px;font-size:18px;
  display:flex;align-items:center;justify-content:center;cursor:pointer;flex:0 0 auto;
}
.back{font-size:16px;}
.content{padding:14px;max-width:760px;margin:0 auto;}

/* сетка разделов */
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
@media(min-width:600px){.grid{grid-template-columns:repeat(4,1fr);}}
.card{
  background:var(--card); border:1px solid var(--line); border-radius:16px;
  padding:14px; cursor:pointer; display:flex; flex-direction:column; gap:8px;
  min-height:118px; text-align:left;
}
.card:active{transform:scale(.98);}
.badge{
  width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:22px;flex:0 0 auto;
}
.card .t{font-size:14px;font-weight:700;}
.card .d{font-size:11px;color:var(--muted);line-height:1.3;flex:1;}
.card .c{font-size:11px;color:var(--muted);}

/* быстрые кнопки */
.quick{display:flex;gap:10px;margin:14px 0;flex-wrap:wrap;}
.qbtn{
  flex:1;min-width:90px;border:0;border-radius:14px;color:#fff;padding:12px;
  font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:8px;justify-content:center;
}
.banner{
  background:linear-gradient(135deg,var(--navy),#2a4f70);color:#fff;border-radius:16px;
  padding:14px 16px;margin-bottom:14px;font-size:13px;line-height:1.4;
}
.banner b{font-size:15px;}

/* подсказка установки */
.install{
  position:relative;background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:14px 16px;margin-bottom:14px;
}
.install-x{position:absolute;top:8px;right:10px;color:var(--muted);font-size:14px;cursor:pointer;padding:4px;}
.install-t{font-size:14px;font-weight:700;margin-bottom:6px;}
.install-b{font-size:13px;color:var(--muted);line-height:1.5;}

/* списки */
.list{display:flex;flex-direction:column;gap:8px;}
.row{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:13px 14px;display:flex;align-items:center;gap:12px;cursor:pointer;
}
.row:active{background:var(--bg);}
.row .ico{font-size:20px;color:var(--navy);flex:0 0 auto;}
.row .tx{flex:1;font-size:14px;line-height:1.35;}
.row .tx small{display:block;color:var(--muted);font-size:12px;margin-top:2px;}
.row .star{font-size:20px;color:var(--amber);background:none;border:0;cursor:pointer;flex:0 0 auto;padding:4px;}
.chev{color:var(--muted);font-size:16px;}

.search{width:100%;padding:11px 14px;border-radius:12px;border:1px solid var(--line);
  background:var(--card);color:var(--text);font-size:15px;margin-bottom:12px;}
.empty{text-align:center;color:var(--muted);padding:50px 20px;font-size:14px;}
.section-title{font-size:13px;color:var(--muted);margin:6px 2px 10px;font-weight:600;}

/* просмотрщик (PDF / тесты / видео) */
.viewer{position:fixed;inset:0;background:var(--bg);display:flex;flex-direction:column;z-index:50;}
.viewer .vbar{
  background:var(--navy);color:#fff;display:flex;align-items:center;gap:10px;
  padding:calc(var(--safe-top) + 8px) 12px 8px;
}
.viewer .vbar .vt{flex:1;font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.viewer iframe,.viewer video{flex:1;width:100%;border:0;background:#000;}
.viewer .openlink{color:#fff;font-size:13px;opacity:.85;text-decoration:underline;background:none;border:0;cursor:pointer;}

/* чат */
.chat{display:flex;flex-direction:column;height:calc(100vh - 0px);}
.msgs{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px;}
.bubble{max-width:82%;padding:10px 13px;border-radius:16px;font-size:14px;line-height:1.4;white-space:pre-wrap;}
.me{align-self:flex-end;background:var(--navy);color:#fff;border-bottom-right-radius:5px;}
.bot{align-self:flex-start;background:var(--card);border:1px solid var(--line);border-bottom-left-radius:5px;}
.bot .speak{margin-top:6px;font-size:12px;color:var(--navy);background:none;border:0;cursor:pointer;padding:0;}
.composer{display:flex;gap:8px;padding:10px 12px calc(var(--safe-bot) + 10px);border-top:1px solid var(--line);background:var(--card);}
.composer input{flex:1;padding:11px 14px;border-radius:22px;border:1px solid var(--line);background:var(--bg);color:var(--text);font-size:15px;}
.composer button{border:0;border-radius:22px;background:var(--navy);color:#fff;padding:0 18px;font-size:15px;font-weight:600;cursor:pointer;}