:root{
  --tim:#5b3fd6; --tim-nhat:#ece7fb; --nen:#f4f4f7; --trang:#fff; --chu:#1d1d28; --mo:#6b6b80;
  --vien:#e3e3ea; --xanh:#1f9d55; --do:#d63c3c; --bong:#e9e4fb; --bong-toi:#5b3fd6;
  --sai:env(safe-area-inset-top,0px); --sab:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box} html,body{margin:0;height:100%;background:var(--nen);color:var(--chu);font:15px/1.4 -apple-system,"Segoe UI",Roboto,Arial,sans-serif;-webkit-text-size-adjust:100%}
button{font:inherit;cursor:pointer} input,textarea{font:inherit;font-size:16px}
[hidden]{display:none!important}
.app{display:flex;height:100%;height:100dvh}
.sidebar{width:100%;background:var(--trang);display:flex;flex-direction:column;border-right:1px solid var(--vien)}
.main{flex:1;display:none;flex-direction:column;min-width:0;position:relative}
@media (min-width:900px){.sidebar{width:340px}.main{display:flex}.back{display:none!important}.empty{display:flex}}
body.view-conv .sidebar{display:none} body.view-conv .main{display:flex}
@media (min-width:900px){body.view-conv .sidebar{display:flex}}
.sb-head{display:flex;align-items:center;justify-content:space-between;padding:calc(10px + var(--sai)) 12px 8px;border-bottom:1px solid var(--vien)}
.sb-title{font-weight:700;font-size:18px;color:var(--tim)}
.sb-actions{display:flex;gap:4px}
.ibtn{background:none;border:0;font-size:20px;padding:6px 8px;border-radius:8px;color:var(--chu)} .ibtn:hover{background:var(--nen)}
.sb-chips{display:flex;gap:6px;padding:8px 10px;overflow-x:auto}
.chip{border:1px solid var(--vien);background:var(--trang);border-radius:16px;padding:4px 12px;font-size:13px;white-space:nowrap}
.chip.on{background:var(--tim);color:#fff;border-color:var(--tim)}
.sb-list{flex:1;overflow-y:auto}
.ht{display:flex;gap:10px;padding:10px 12px;align-items:center;cursor:pointer;border-bottom:1px solid #f0f0f4}
.ht:hover,.ht.on{background:var(--tim-nhat)}
.av{width:44px;height:44px;border-radius:50%;background:var(--tim-nhat);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--tim);flex:none;font-size:16px}
.av.bot{background:#ffe9c7;color:#b8651b}.av.kho{background:#dff3e6;color:#1f7a44}.av.nhom{background:#d9ecfb;color:#1a5f9e}
.ht-body{flex:1;min-width:0}.ht-top{display:flex;justify-content:space-between;gap:6px}
.ht-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ht-time{color:var(--mo);font-size:12px;flex:none}
.ht-prev{color:var(--mo);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ht.unread .ht-name,.ht.unread .ht-prev{color:var(--chu);font-weight:700}
.badge{background:var(--do);color:#fff;border-radius:10px;font-size:11px;padding:1px 6px;min-width:18px;text-align:center;flex:none}
.pin{font-size:11px;color:var(--mo)}
.conv{display:flex;flex-direction:column;height:100%;background:var(--nen)}
.conv-head{display:flex;align-items:center;gap:8px;padding:calc(8px + var(--sai)) 10px 8px;background:var(--trang);border-bottom:1px solid var(--vien)}
.conv-avatar{width:36px;height:36px;border-radius:50%;background:var(--tim-nhat);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--tim);flex:none}
.conv-title{flex:1;min-width:0}.conv-name{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-sub{font-size:12px;color:var(--mo)}
.msgs{flex:1;overflow-y:auto;padding:10px 10px 6px;display:flex;flex-direction:column;gap:2px;-webkit-overflow-scrolling:touch}
.day{align-self:center;background:#dcdce4;color:#444;font-size:12px;padding:2px 10px;border-radius:12px;margin:8px 0}
.sys{align-self:center;color:var(--mo);font-size:12px;text-align:center;margin:4px 0;max-width:80%}
/* 12/10: hàng tin rộng CỐ ĐỊNH 78%, bong bóng co theo chữ trong khung đó — không để trình duyệt tự đoán độ rộng (Safari/khung rộng bóp còn 1 chữ/dòng) */
.mrow{display:flex;flex-direction:column;align-items:flex-start;width:78%;max-width:78%;flex:none;min-width:0}
.mrow.me{align-self:flex-end;align-items:flex-end}
.mrow .who{font-size:12px;color:var(--mo);margin:6px 0 2px 8px}
.bub{max-width:100%;min-width:0;background:var(--trang);border-radius:16px;padding:8px 12px;box-shadow:0 1px 1px rgba(0,0,0,.05);word-wrap:break-word;white-space:pre-wrap;position:relative}
.mrow.me .bub{background:var(--bong-toi);color:#fff}
.mrow.bot .bub{background:#fff8ec;border:1px solid #ffe2b3}
.bub a{color:inherit;text-decoration:underline}
.bub .tt{font-weight:700;display:block;margin-bottom:2px}
.bub.recalled{color:var(--mo);font-style:italic;background:#f0f0f4}
.bub img.anh{max-width:260px;max-height:320px;border-radius:10px;display:block;cursor:zoom-in}
.bub .tep{display:flex;gap:8px;align-items:center;text-decoration:none;color:inherit}
.bub .tep .ic{font-size:26px}.bub .tep .tn{font-weight:600;word-break:break-all}.bub .tep .kt{font-size:12px;opacity:.75}
.bub .qt{border-left:3px solid rgba(0,0,0,.25);padding:2px 8px;margin-bottom:4px;font-size:13px;opacity:.85;cursor:pointer}
.mrow.me .bub .qt{border-color:rgba(255,255,255,.6)}
.time{font-size:11px;color:var(--mo);margin:2px 8px 0}
.mrow.me .time{text-align:right}
.mrow.pending .bub{opacity:.6}.mrow.failed .time{color:var(--do)}
.cx{display:flex;gap:4px;margin:-6px 6px 4px;font-size:12px}.cx span{background:#fff;border:1px solid var(--vien);border-radius:10px;padding:0 6px}
.toast-new{position:absolute;left:50%;transform:translateX(-50%);bottom:76px;background:var(--tim);color:#fff;padding:6px 14px;border-radius:16px;font-size:13px;cursor:pointer;z-index:5}
.reply-bar{display:flex;align-items:center;gap:8px;background:var(--trang);border-top:1px solid var(--vien);padding:4px 10px;font-size:13px;color:var(--mo)}
.reply-bar span{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.composer{display:flex;align-items:flex-end;gap:4px;padding:8px 8px calc(8px + var(--sab));background:var(--trang);border-top:1px solid var(--vien)}
.composer textarea{flex:1;border:1px solid var(--vien);border-radius:18px;padding:8px 12px;resize:none;max-height:120px;line-height:1.35;outline:none}
.composer .send{background:var(--tim);color:#fff;border:0;border-radius:18px;padding:8px 14px;font-weight:600}
.composer.locked{justify-content:center;color:var(--mo);font-size:14px}
.empty{display:none;flex:1;align-items:center;justify-content:center;color:var(--mo)}
.page{display:flex;flex-direction:column;height:100%}.page-body{flex:1;overflow-y:auto;padding:12px}
.card{background:var(--trang);border-radius:12px;padding:12px;margin-bottom:12px;box-shadow:0 1px 2px rgba(0,0,0,.05)}
.card-t{font-weight:700;margin-bottom:8px}.row{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}
.btn{background:var(--tim);color:#fff;border:0;border-radius:10px;padding:9px 14px;font-weight:600}
.btn.ghost{background:var(--tim-nhat);color:var(--tim)}
.muted{color:var(--mo)}.small{font-size:12px}.note{background:#fff8ec;border:1px solid #ffe2b3;border-radius:8px;padding:8px;font-size:13px;margin:8px 0}
.card input{width:100%;border:1px solid var(--vien);border-radius:8px;padding:8px;margin:6px 0}
.checklist{max-height:220px;overflow-y:auto;margin:6px 0}.checklist label{display:block;padding:4px 0}
.list .ht{border-bottom:1px solid var(--vien)}
.login{display:flex;align-items:center;justify-content:center;height:100%;height:100dvh;padding:20px}
.login-box{background:var(--trang);padding:28px 24px;border-radius:16px;width:100%;max-width:360px;display:flex;flex-direction:column;gap:10px;align-items:center;box-shadow:0 4px 24px rgba(0,0,0,.08)}
.login-box h1{font-size:20px;margin:4px 0 8px;color:var(--tim)}
.login-box input{width:100%;border:1px solid var(--vien);border-radius:10px;padding:10px 12px}
.login-box .btn{width:100%}.err{color:var(--do);font-size:13px;min-height:1em}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(24px + var(--sab));background:#222;color:#fff;padding:8px 16px;border-radius:20px;font-size:14px;z-index:120}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:110;padding:20px}
.modal-box{background:var(--trang);border-radius:14px;padding:16px;width:100%;max-width:380px}
.modal-box h3{margin:0 0 8px}.modal-box .row{justify-content:flex-end}
.modal-box .opt{display:block;width:100%;text-align:left;background:none;border:0;padding:10px 6px;border-bottom:1px solid var(--vien)}
.modal-box .opt:hover{background:var(--nen)}
.viewer{position:fixed;inset:0;background:#000;display:flex;align-items:center;justify-content:center;z-index:130}
.viewer img{max-width:100%;max-height:100%}
.viewer .ibtn{position:absolute;top:calc(10px + var(--sai));right:10px;color:#fff;font-size:26px;background:rgba(0,0,0,.58);border:1px solid rgba(255,255,255,.5)}
.menu-btn{position:absolute;top:2px;right:-30px;opacity:0;font-size:16px;background:none;border:0;color:var(--mo)}
.mrow.me .menu-btn{right:auto;left:-30px}
.mrow:hover .menu-btn{opacity:1}
@media (hover:none){.menu-btn{display:none}}

/* 12/10: ảnh đại diện nhóm / Trợ Lý */
.av.co-anh,.conv-avatar.co-anh{background:none;overflow:hidden;padding:0}.av.co-anh img,.conv-avatar.co-anh img{width:100%;height:100%;object-fit:cover;border-radius:50%;display:block}