:root{--bg:#f6f7f9;--sf:#fff;--tx:#14171c;--mu:#5d6876;--ln:#dde2e8;--ac:#0a7d93;--ac2:#e3f4f7;--on:#fff;color-scheme:light dark}
@media(prefers-color-scheme:dark){:root{--bg:#0b0f16;--sf:#131a24;--tx:#f1eee8;--mu:#93a1b2;--ln:#243040;--ac:#19d3f0;--ac2:#0f2a33;--on:#04161a}}
*{box-sizing:border-box}html,body{margin:0}body{background:var(--bg);color:var(--tx);font:16px/1.45 system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--ac)}.mu{color:var(--mu)}.sp{flex:1}
header{display:flex;gap:12px;align-items:center;padding:10px 16px;background:var(--sf);border-bottom:1px solid var(--ln);flex-wrap:wrap}
button,select,input,textarea{font:inherit;color:var(--tx)}
button,.btn{min-height:44px;padding:0 18px;border:1px solid var(--ln);background:var(--sf);border-radius:10px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;color:var(--tx)}
button:hover,.btn:hover{border-color:var(--ac)}button.on{background:var(--ac);border-color:var(--ac);color:var(--on)}
button.sm{min-height:32px;padding:0 10px;font-size:13px}button:disabled{opacity:.4;cursor:default}
input,select,textarea{width:100%;padding:8px 10px;border:1px solid var(--ln);border-radius:8px;background:var(--sf)}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:8px 0}
main.wrap{max-width:900px;margin:0 auto;padding:16px}.grid{display:flex;gap:10px;flex-wrap:wrap}
.grid .btn,.grid button{min-height:56px;font-size:18px;font-weight:600}h2{font-size:16px;color:var(--mu);margin:22px 0 10px}
/* workspace */
body.ws{height:100dvh;display:flex;flex-direction:column;overflow:hidden}
.tabs{display:flex;gap:8px;padding:10px 16px 0;background:var(--sf)}
.tabs button{flex:1;max-width:240px;min-height:56px;font-weight:700;letter-spacing:.05em;border-radius:10px 10px 0 0;border-bottom:0;justify-content:center}
.topics{display:flex;gap:8px;overflow-x:auto;padding:10px 16px;background:var(--sf);border-bottom:1px solid var(--ln)}
.topics button{white-space:nowrap;min-height:50px;border-radius:999px}
#main{flex:1;min-height:0;position:relative}#main>section{position:absolute;inset:0;display:flex;flex-direction:column;overflow:auto}
[hidden]{display:none!important}iframe{flex:1;width:100%;border:0;background:#05070b}
.bar{display:flex;gap:8px;align-items:center;padding:8px 16px;background:var(--sf);border-bottom:1px solid var(--ln);flex-wrap:wrap}
.cw{flex:1;overflow:auto;text-align:center;padding:8px}canvas{max-width:100%;box-shadow:0 1px 6px #0003}
.pad{padding:16px}footer.nav{display:flex;gap:10px;padding:10px 16px;border-top:1px solid var(--ln);background:var(--sf);justify-content:space-between;align-items:center}
footer.nav button{min-height:54px;font-weight:600}
.q{padding:14px 0;border-bottom:1px solid var(--ln)}.q .o{display:block;width:100%;text-align:left;margin:6px 0;min-height:48px}
.q .o.good{border-color:#1c9a55;background:#1c9a5522}.q .o.bad{border-color:#d33;background:#d3333322}
body.cm header{display:none}
/* admin */
.item{display:flex;gap:6px;align-items:center;padding:8px 0;border-bottom:1px solid var(--ln);flex-wrap:wrap}
.item input.n{flex:1;min-width:140px}.item input.p{width:64px}
#login{max-width:340px;margin:12vh auto;padding:20px;background:var(--sf);border:1px solid var(--ln);border-radius:12px}.err{color:#d33}
.atabs{display:flex;gap:6px;margin:12px 0;flex-wrap:wrap}.atabs button{min-height:38px}
label{display:block;font-size:12px;color:var(--mu);margin:10px 0 3px}