:root{--bg:#fafaf7;--card:#fff;--text:#1d2125;--muted:#5d6670;--line:#e3e1d8;--accent:#2b6cb0;--soft:#eef4fb}
@media (prefers-color-scheme:dark){:root{--bg:#16181b;--card:#1f2226;--text:#e8eaec;--muted:#9aa3ad;--line:#33383e;--accent:#7db3ee;--soft:#1d2a39}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
button,input,select,textarea{font:inherit;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:10px 12px;min-height:44px}
button{background:var(--accent);color:#fff;border:0;cursor:pointer}
button.ghost{background:var(--card);color:var(--text);border:1px solid var(--line)}
#login{max-width:360px;margin:12vh auto;padding:16px}
#login label{display:block;margin:10px 0}#login input{width:100%}
.err{color:#c53030}.small{font-size:.85rem;color:var(--muted)}
#app{display:grid;grid-template-columns:1fr 340px;grid-template-rows:auto 1fr;height:100dvh}
header{grid-column:1/3;display:flex;gap:8px;align-items:center;padding:8px 12px;border-bottom:1px solid var(--line)}
header .sp{flex:1}header button{padding:6px 10px;min-height:36px}
#canvas{overflow:auto;padding:12px;display:grid;gap:12px;align-content:start}
.block{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 12px;min-width:0}
.block>.bh{display:flex;gap:6px;align-items:center;margin-bottom:8px}
.block>.bh b{flex:1}.bh button{padding:2px 8px;min-height:32px;background:var(--card);color:var(--text);border:1px solid var(--line)}
.board{display:flex;gap:8px;overflow-x:auto}
.col{min-width:150px;flex:1}.col h4{margin:0 0 6px;font-size:.85rem;color:var(--muted)}
.cl{display:block;width:100%;text-align:left;background:var(--soft);color:var(--text);margin-bottom:6px;padding:8px 10px;min-height:44px}
#chat{border-left:1px solid var(--line);display:flex;flex-direction:column;padding:8px;min-height:0}
#log{flex:1;overflow:auto}.m{margin:6px 0;padding:8px 10px;border-radius:10px;background:var(--soft);white-space:pre-wrap}
.m.me{background:var(--accent);color:#fff;margin-left:24px}
#chat-form{display:flex;gap:6px}#chat-form input[type=text],#msg{flex:1;min-width:0}
.file{display:flex;align-items:center;padding:0 8px;border:1px solid var(--line);border-radius:8px;cursor:pointer}
.row{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0}.row>*{flex:1;min-width:120px}
ul.plain{list-style:none;padding:0;margin:0}ul.plain li{padding:6px 0;border-bottom:1px solid var(--line)}
@media (max-width:760px){
  #app{grid-template-columns:1fr;grid-template-rows:auto 1fr auto}
  header{grid-column:1}
  #chat{border-left:0;border-top:1px solid var(--line);max-height:42dvh}
  .board{flex-direction:column;overflow:visible}.col{min-width:0}
  button{min-height:48px}
}