:root{
  --bg:#f4f6fb; --card:#ffffff; --text:#17203a; --muted:#6b7690; --line:#e3e8f2;
  --brand:#2563eb; --brand2:#1d4ed8; --danger:#dc2626; --bubble:#eef2ff; --mine:#2563eb;
}
[data-theme="dark"]{
  --bg:#0e1322; --card:#171e33; --text:#e8ecf6; --muted:#93a0bd; --line:#26304d;
  --bubble:#1f2a4a; --mine:#2563eb;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text)}
button{font:inherit;cursor:pointer}
input,select{font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--text);width:100%}
input[type="color"]{padding:2px;width:56px;height:34px}
.primary{background:var(--brand);color:#fff;border:none;border-radius:10px;padding:10px 18px;font-weight:600}
.primary:hover{background:var(--brand2)}
.primary.big,.danger.big{width:100%;padding:13px;font-size:16px}
.danger{background:var(--danger);color:#fff;border:none;border-radius:10px;padding:10px 18px;font-weight:600}
.chipBtn{background:var(--card);border:1px solid var(--line);color:var(--text);border-radius:999px;padding:6px 12px;font-size:13px}
.err{color:var(--danger);min-height:20px;font-size:14px;margin:6px 0}

/* auth */
.authWrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}
.authCard{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px 22px;max-width:400px;width:100%;box-shadow:0 10px 40px rgba(20,30,80,.08)}
.authCard .logo{font-size:52px;text-align:center}
.authCard h1{text-align:center;margin:6px 0 2px;font-size:26px}
.tagline{text-align:center;color:var(--muted);margin:0 0 18px;font-size:14px}
.authTabs{display:flex;gap:8px;margin-bottom:14px}
.authTabs button{flex:1;padding:10px;border-radius:10px;border:1px solid var(--line);background:transparent;color:var(--muted);font-weight:600}
.authTabs button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.authCard label{display:block;font-size:13px;color:var(--muted);margin:10px 0 4px}
.privacy{font-size:12.5px;color:var(--muted);line-height:1.5;margin-top:14px}

/* layout */
header{position:sticky;top:0;z-index:20;background:var(--card);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:10px 14px}
.brand{font-size:18px}
.logoSm{font-size:22px}
.headRight{display:flex;align-items:center;gap:10px}
.iconBtn{background:none;border:none;font-size:20px}
.meChip{font-weight:700;padding:5px 12px;border-radius:999px;color:#fff;font-size:14px}
.page{max-width:860px;margin:0 auto;padding:14px 14px 92px}
nav{position:fixed;bottom:0;left:0;right:0;background:var(--card);border-top:1px solid var(--line);display:flex;z-index:20}
nav button{flex:1;background:none;border:none;padding:8px 0 10px;font-size:20px;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:1px}
nav button span{font-size:11.5px;font-weight:600}
nav button.on{color:var(--brand)}

/* news */
.newsTools{display:flex;gap:8px;margin-bottom:10px}
.newsTools input{flex:1}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:8px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chipBtn.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.newsMeta{color:var(--muted);font-size:12.5px;margin:4px 0 10px}
.newsCard{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;margin-bottom:10px;display:flex;gap:12px}
.newsCard img{width:104px;height:80px;object-fit:cover;border-radius:10px;flex:none;background:var(--line)}
.newsCard .nc-body{flex:1;min-width:0}
.newsCard a{color:var(--text);text-decoration:none;font-weight:650;line-height:1.35;display:block}
.newsCard a:hover{color:var(--brand)}
.newsCard p{color:var(--muted);font-size:13.5px;margin:6px 0;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.nc-meta{display:flex;gap:8px;align-items:center;font-size:12px;color:var(--muted)}
.srcBadge{background:var(--bubble);border-radius:6px;padding:2px 7px;font-weight:600}
.saveBtn{margin-left:auto;background:none;border:none;font-size:17px}
.hotTag{color:#ea580c;font-weight:700}
.moreBtn{width:100%;padding:12px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--text);font-weight:600}

/* chat & ai */
.aiHead{display:flex;align-items:center;gap:10px;font-weight:700;margin-bottom:10px}
.aiLeft{color:var(--muted);font-size:12.5px;font-weight:500;flex:1}
.chatBox{display:flex;flex-direction:column;gap:8px;overflow-y:auto;padding:4px 2px}
.chatBox.grow{flex:1}
.msg{max-width:82%;padding:9px 13px;border-radius:16px;background:var(--bubble);line-height:1.5;font-size:15px;white-space:pre-wrap;word-break:break-word}
.msg.mine{align-self:flex-end;background:var(--mine);color:#fff}
.msg .mFrom{font-size:12px;font-weight:700;margin-bottom:2px}
.msg .mTime{font-size:10.5px;opacity:.65;margin-top:3px;text-align:right}
.msg .mAct{font-size:11px;background:none;border:none;opacity:.6;float:right;cursor:pointer}
.msg.ai{align-self:flex-start}
.msg.me{align-self:flex-end;background:var(--mine);color:#fff}
.typing{color:var(--muted);font-style:italic;font-size:14px}
.composer{display:flex;gap:8px;margin-top:10px}
.composer input{flex:1}
.chatLayout{display:flex;gap:12px;height:calc(100vh - 190px);min-height:380px}
#roomList{width:190px;flex:none;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px;overflow-y:auto}
.roomTitle{font-size:12px;color:var(--muted);font-weight:700;margin:8px 2px 6px;text-transform:uppercase}
.room{padding:8px 10px;border-radius:10px;cursor:pointer;font-size:14.5px}
.room:hover{background:var(--bubble)}
.room.on{background:var(--brand);color:#fff;font-weight:600}
.chatMain{flex:1;display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;min-width:0}
.chatTitle{font-weight:700;padding-bottom:8px;border-bottom:1px solid var(--line);margin-bottom:8px}
@media(max-width:640px){
  .chatLayout{flex-direction:column;height:auto}
  #roomList{width:100%;display:flex;flex-wrap:wrap;gap:4px;align-items:center}
  .roomTitle{width:100%}
  .chatMain{min-height:52vh}
  .newsCard img{width:84px;height:66px}
}

/* me */
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:12px}
.card h3{margin:0 0 12px}
.card .row{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:9px 0;font-size:14.5px}
.card input{margin:6px 0}
.card .primary{margin-top:8px}
.adminBlock{border-top:1px dashed var(--line);padding-top:12px;margin-top:12px}
.uRow,.rRow{display:flex;gap:8px;align-items:center;padding:7px 0;border-bottom:1px solid var(--line);font-size:14px;flex-wrap:wrap}
.uRow .grow,.rRow .grow{flex:1;min-width:120px}
.banBtn{background:var(--danger);color:#fff;border:none;border-radius:8px;padding:5px 10px;font-size:12.5px}
.okBtn{background:var(--brand);color:#fff;border:none;border-radius:8px;padding:5px 10px;font-size:12.5px}
#toast{position:fixed;left:50%;bottom:86px;transform:translateX(-50%);background:#17203a;color:#fff;padding:10px 18px;border-radius:999px;font-size:14px;opacity:0;pointer-events:none;transition:opacity .25s;z-index:50;max-width:88vw;text-align:center}
#toast.show{opacity:.95}

/* ===== Hub V2 ===== */
nav button{font-size:19px}
nav button span{font-size:10.5px}
.hubGrid{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:760px){.hubGrid{grid-template-columns:1fr 1fr}}
.widget{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.widget h4{margin:0 0 10px;font-size:15.5px}
.widget textarea{font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--text);width:100%;resize:vertical}
.widget .primary{margin-top:8px}
.wGreet{font-size:17px;font-weight:700}
.wClock{font-size:42px;font-weight:800;letter-spacing:1px;margin:4px 0 0;font-variant-numeric:tabular-nums}
.wDate{color:var(--muted);font-size:14px;text-transform:capitalize}
.wWeather{font-size:14.5px;line-height:1.55}
.wWeather .big{font-size:30px;font-weight:800}
.wDays{display:flex;gap:8px;margin-top:8px}
.wDay{flex:1;background:var(--bubble);border-radius:10px;padding:7px 4px;text-align:center;font-size:12.5px;line-height:1.4}
.rowBtns{display:flex;gap:8px;align-items:center;margin:6px 0}
.rowBtns input,.rowBtns select{flex:1;min-width:0}
.rowBtns.center{justify-content:center;flex-wrap:wrap}
.rowBtns .primary{margin-top:0}
.trendWrap{display:flex;flex-wrap:wrap;gap:7px}
.trendChip{background:var(--bubble);border:1px solid var(--line);color:var(--text);border-radius:999px;padding:6px 12px;font-size:13.5px;cursor:pointer}
.trendChip:hover{border-color:var(--brand);color:var(--brand)}
.headItem{display:flex;gap:9px;padding:8px 0;border-bottom:1px solid var(--line);cursor:pointer;align-items:center}
.headItem:last-of-type{border-bottom:none}
.headItem img{width:56px;height:44px;object-fit:cover;border-radius:8px;flex:none;background:var(--line)}
.headItem .ht{font-size:14px;font-weight:600;line-height:1.35}
.headItem .hm{font-size:11.5px;color:var(--muted)}
.todoRow{display:flex;gap:9px;align-items:center;padding:7px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.todoRow .tt{flex:1}
.todoRow.done .tt{text-decoration:line-through;color:var(--muted)}
.todoRow button{background:none;border:none;font-size:15px}
.pomWrap{text-align:center}
.pomTime{font-size:44px;font-weight:800;font-variant-numeric:tabular-nums}
.pomBar{height:8px;background:var(--line);border-radius:99px;overflow:hidden;margin:8px 0 12px}
#pomFill{height:100%;width:0%;background:var(--brand);transition:width .5s}
.clipRow{display:flex;gap:8px;align-items:flex-start;padding:8px 0;border-bottom:1px solid var(--line);font-size:13.5px}
.clipRow .ct{flex:1;white-space:pre-wrap;word-break:break-word;max-height:64px;overflow:hidden}
.clipRow button{background:none;border:1px solid var(--line);border-radius:8px;padding:4px 9px;font-size:12.5px;color:var(--text)}
.sumBtn{background:none;border:1px solid var(--line);border-radius:8px;font-size:12.5px;padding:3px 9px;color:var(--text)}
.sumBox{display:none;background:var(--bubble);border-radius:10px;padding:10px 12px;font-size:13.5px;line-height:1.55;margin-top:8px}
.sumBox.show{display:block}
.sumBox b{color:var(--brand)}
.qrBox{display:flex;justify-content:center;padding:12px 0}
.qrBox canvas{max-width:220px;width:100%;height:auto;image-rendering:pixelated}
.toolOut{font-size:21px;font-weight:800;margin:10px 0 2px}
.fld{font-size:12.5px;color:var(--muted);flex:1}
.fld input,.fld select{margin-top:3px}
.calcPad{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin-top:8px}
.calcPad button{padding:12px 0;border-radius:10px;border:1px solid var(--line);background:var(--bubble);color:var(--text);font-size:16px;font-weight:600}
.calcPad button.op{background:var(--brand);color:#fff;border-color:var(--brand)}
#calcDisp{font-size:20px;text-align:right;font-weight:700}
.tzRow{display:flex;justify-content:space-between;padding:7px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.tzRow:last-child{border-bottom:none}
.tzRow b{font-variant-numeric:tabular-nums}
#palette{position:fixed;inset:0;background:rgba(10,15,35,.55);z-index:60;display:flex;align-items:flex-start;justify-content:center;padding:10vh 14px 14px}
.palCard{background:var(--card);border-radius:16px;max-width:560px;width:100%;padding:14px;box-shadow:0 18px 60px rgba(0,0,0,.3)}
.palItem{display:flex;gap:10px;align-items:center;width:100%;text-align:left;background:none;border:none;padding:11px 10px;border-radius:10px;color:var(--text);font-size:15px;cursor:pointer}
.palItem.on,.palItem:hover{background:var(--bubble)}
.palItem small{color:var(--muted);margin-left:auto}

/* ===== Che do Khach (khong bat dang nhap) ===== */
.authWrap{position:fixed;inset:0;z-index:70;overflow:auto;background:var(--bg)}
.authCard{position:relative}
.authClose{position:absolute;top:8px;right:10px;background:none;border:none;font-size:19px;color:var(--muted);cursor:pointer;padding:6px}
#chatGuest{text-align:center}
#chatGuest p{line-height:1.6;color:var(--muted)}
#guestCard p{line-height:1.6;color:var(--muted)}

/* ===== Feed file + Ban be (V2.1) ===== */
#feedProgWrap{margin:10px 0 2px}
#feedProg{height:100%;width:0%;background:var(--brand);transition:width .3s}
.fileRow{display:flex;gap:11px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-bottom:9px}
.fileRow .fIco{font-size:27px;flex:none}
.fileRow .fMain{flex:1;min-width:0}
.fileRow .fName{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fileRow .fMeta{font-size:12.5px;color:var(--muted)}
.fileRow .fBtns{display:flex;gap:6px;flex:none}
.friendAdd{display:flex;gap:6px;margin-top:8px}
.friendAdd input{flex:1;min-width:0}
.friendRow{display:flex;gap:8px;align-items:center;padding:7px 8px;border-radius:10px;font-size:14px}
.friendRow:hover{background:var(--bubble)}
.friendRow .fName{flex:1;cursor:pointer}
.friendRow button{background:none;border:1px solid var(--line);border-radius:8px;padding:3px 9px;font-size:12.5px;color:var(--text)}
.uidBig{font-size:19px;letter-spacing:2px;color:var(--brand)}
.dotOn{color:#22c55e}.dotOff{color:var(--muted)}