:root{--bg:#f5f6f8;--panel:#fff;--side:#1f2937;--side-fg:#e5e7eb;--fg:#111827;--muted:#6b7280;--line:#e5e7eb;--accent:#2563eb;--accent-h:#1d4ed8;--me:#e8efff;--err:#dc2626;--ok:#15803d}
@media (prefers-color-scheme:dark){:root{--bg:#111827;--panel:#1f2937;--side:#0b1220;--fg:#f3f4f6;--muted:#9ca3af;--line:#374151;--me:#1e3a8a}}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--fg);font:15px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
button,.btn{font:inherit;border:none;border-radius:8px;background:var(--accent);color:#fff;padding:8px 14px;cursor:pointer;display:inline-block}
button:hover,.btn:hover{background:var(--accent-h)}
button:disabled{opacity:.6;cursor:default}
input,select,textarea{font:inherit;color:var(--fg);background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:8px 10px}
.err{color:var(--err);min-height:1em;margin:4px 0}.note{color:var(--muted);font-size:13px}
.screen{height:100%}
[hidden]{display:none!important}
#login{display:flex;align-items:center;justify-content:center}
.login-box{background:var(--panel);padding:28px;border-radius:14px;box-shadow:0 4px 24px rgba(0,0,0,.08);display:flex;flex-direction:column;gap:10px;width:min(360px,92vw)}
.login-box h1{font-size:20px;margin:0 0 8px}
#app:not([hidden]){display:flex}
#side{width:290px;flex:none;background:var(--side);color:var(--side-fg);display:flex;flex-direction:column}
.side-head{display:flex;justify-content:space-between;align-items:center;padding:14px}
.side-head button{padding:6px 10px;font-size:13px}
.all-toggle{padding:0 14px 8px;font-size:13px;color:#9ca3af}
#chats{list-style:none;margin:0;padding:0 6px;overflow:auto;flex:1}
#chats li{padding:9px 10px;border-radius:8px;cursor:pointer;display:flex;flex-direction:column;gap:2px}
#chats li:hover{background:rgba(255,255,255,.06)}#chats li.on{background:rgba(255,255,255,.12)}
#chats li .t{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#chats li .o{font-size:12px;color:#9ca3af}
.side-foot{padding:12px 14px;border-top:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column;gap:6px;font-size:13px}
.side-foot a{color:#93c5fd;text-decoration:none}
#main{flex:1;min-width:0;display:flex;flex-direction:column;position:relative}
#menu{display:none;position:absolute;left:8px;top:8px;z-index:3;padding:6px 10px}
section{flex:1;display:flex;flex-direction:column;min-height:0}
section[hidden]{display:none}
#chat-head{padding:14px 20px;border-bottom:1px solid var(--line);background:var(--panel);display:flex;justify-content:space-between;gap:10px;align-items:center}
#chat-head .sub{color:var(--muted);font-size:13px}
#chat-head button{background:transparent;color:var(--muted);padding:4px 8px}
#msgs{flex:1;overflow:auto;padding:20px;display:flex;flex-direction:column;gap:12px}
.msg{max-width:min(760px,90%);padding:10px 14px;border-radius:12px;background:var(--panel);border:1px solid var(--line);white-space:pre-wrap;word-wrap:break-word}
.msg.user{align-self:flex-end;background:var(--me);border-color:transparent}
.msg .time{display:block;font-size:11px;color:var(--muted);margin-top:4px}
.file{display:flex;align-items:center;gap:10px;margin:6px 0 2px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--bg);text-decoration:none;color:inherit;white-space:normal}
.file .ic{font-size:22px}.file .nm{font-weight:600}.file .sz{font-size:12px;color:var(--muted)}
.file.result{border-color:var(--accent)}
#pending{margin:0 20px 10px;padding:10px 14px;border-radius:10px;background:var(--panel);border:1px dashed var(--line);color:var(--muted)}
.spin{display:inline-block;width:12px;height:12px;border:2px solid var(--muted);border-top-color:transparent;border-radius:50%;animation:s 1s linear infinite;vertical-align:-1px;margin-right:6px}
@keyframes s{to{transform:rotate(360deg)}}
#composer{display:flex;gap:8px;align-items:flex-end;padding:12px 20px 18px;background:var(--bg)}
.attach{font-size:22px;cursor:pointer;padding:6px}
.input-wrap{flex:1;display:flex;flex-direction:column;gap:6px}
#text{width:100%;resize:none;max-height:200px}
#file-chip{font-size:13px;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:4px 8px;align-self:flex-start}
#file-chip button{background:transparent;color:var(--muted);padding:0 4px}
#drop{position:absolute;inset:0;background:rgba(37,99,235,.12);border:3px dashed var(--accent);display:flex;align-items:center;justify-content:center;font-size:18px;z-index:5}
#drop[hidden]{display:none}
.empty{margin:auto;max-width:520px;text-align:center;padding:20px}
.empty p{color:var(--muted)}
#admin-view{padding:16px 20px;overflow:auto}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.tabs button{background:var(--panel);color:var(--fg);border:1px solid var(--line)}
.tabs button.on{background:var(--accent);color:#fff;border-color:var(--accent)}
#admin-close{margin-left:auto}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:8px 0}
table{border-collapse:collapse;width:100%;background:var(--panel)}
td,th{border-bottom:1px solid var(--line);padding:8px;text-align:left;font-size:14px}
td button{padding:4px 8px;font-size:13px;margin:2px}
tr.off td{opacity:.5}
#skill-text{width:100%;min-height:55vh;font:13px/1.5 ui-monospace,Consolas,monospace}
#skill-note{flex:1;min-width:200px}
#skill-hist,#refs{padding-left:18px}
#skill-hist a,#refs a{color:var(--accent)}
.pw{font-family:ui-monospace,monospace;background:var(--bg);padding:2px 6px;border-radius:4px;user-select:all}
dialog{border:none;border-radius:12px;padding:20px;background:var(--panel);color:var(--fg)}
dialog form{display:flex;flex-direction:column;gap:8px;min-width:280px}
@media (max-width:760px){
  #side{position:fixed;inset:0 auto 0 0;z-index:10;transform:translateX(-100%);transition:transform .2s}
  #side.open{transform:none}
  #menu{display:block}
  #chat-head{padding-left:56px}
  #msgs,#composer{padding-left:12px;padding-right:12px}
  .msg{max-width:95%}
}