:root{
  --bg:#F4F6FB; --surf:#FFFFFF; --surf2:#F7F9FD; --line:#E6EAF2; --line2:#D8DEE9;
  --ink:#0B1220; --ink2:#475569; --ink3:#8A94A6;
  --brand:#2F6BFF; --brandH:#1F57E0; --brandSoft:#EAF0FF;
  --ok:#16A34A; --warn:#D97706; --danger:#DC2626;
  --r:16px; --rSm:10px;
  --sh:0 1px 2px rgba(11,18,32,.04), 0 8px 24px rgba(11,18,32,.06);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;font:14px/1.5 -apple-system,"Segoe UI","PingFang HK","Microsoft JhengHei",system-ui,sans-serif;
  color:var(--ink);background:radial-gradient(1200px 560px at 14% -18%,#E9EFFB 0%,var(--bg) 55%);
  display:flex;height:100vh;overflow:hidden;
}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#C7CFDC;border-radius:99px;border:3px solid transparent;background-clip:content-box}

.side{width:280px;flex:none;display:flex;flex-direction:column;gap:12px;padding:16px 12px 16px 16px;overflow:auto}
.brand{display:flex;align-items:center;gap:10px;padding:2px 4px 8px}
.brand .logo{width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,#2F6BFF,#6C8CFF);
  color:#fff;flex:none;display:grid;place-items:center;box-shadow:0 6px 18px rgba(47,107,255,.4)}
.brand .logo svg{width:20px;height:20px;display:block}
.brand b{font-size:15px;letter-spacing:-.2px}
.brand small{display:block;color:var(--ink3);font-size:11px;font-weight:400}
.card{background:var(--surf);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh)}
.sec-t{font-size:10.5px;letter-spacing:.5px;color:var(--ink3);padding:12px 14px 6px;text-transform:uppercase}
.mem{display:flex;align-items:center;gap:10px;padding:8px 12px;margin:2px 6px;border-radius:12px;cursor:pointer;
  transition:background .15s;border:1px solid transparent;user-select:none}
.mem:hover{background:#F7F9FD}
.mem.on{background:var(--brandSoft);border-color:#D5E0FF}
.mem .av{width:32px;height:32px;border-radius:50%;flex:none;display:grid;place-items:center;color:#fff;font-weight:600;font-size:13px}
.mem .nm{flex:1;min-width:0}
.mem .nm b{display:block;font-size:13px;font-weight:600;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mem .nm small{display:block;color:var(--ink3);font-size:10.5px;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mem .dot{width:8px;height:8px;border-radius:50%;flex:none;background:#CBD5E1}
.mem .dot.up{background:var(--ok);box-shadow:0 0 0 3px rgba(22,163,74,.15)}
.mem .dot.you{background:var(--brand);box-shadow:0 0 0 3px rgba(47,107,255,.16)}
.mem .tick{width:16px;height:16px;border-radius:50%;border:2px solid var(--line2);flex:none}
.mem.on .tick{background:var(--brand);border-color:var(--brand);position:relative}
.mem.on .tick::after{content:"";position:absolute;left:4px;top:1px;width:4px;height:8px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}
.mem.you{cursor:default;opacity:.95}
.hint{color:var(--ink3);font-size:11px;padding:8px 14px 12px;line-height:1.55}
.hint b{color:var(--ink2)}

.main{flex:1;min-width:0;display:flex;flex-direction:column;padding:16px 16px 16px 4px}
.chat{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden;border-radius:18px}
/* Phase 41c：三行 header（房間掣 → 標題 → 控制項），所有尺寸統一 */
.hd{display:flex;align-items:center;gap:8px;padding:10px 16px;border-bottom:1px solid var(--line);
  background:var(--surf);border-radius:18px 18px 0 0;flex-wrap:wrap;min-width:0}
.hd h1{margin:0;font-size:15px;font-weight:650;letter-spacing:-.2px;display:flex;align-items:center;gap:8px;
  min-width:0;flex:1 1 100%;white-space:normal;overflow:visible}
.hd .st{font-size:11.5px;color:var(--ink3);font-weight:400;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.hd .st .up{color:var(--ok);font-weight:600}
.hd .right{margin-left:0;display:flex;align-items:center;gap:8px;flex-wrap:wrap;flex:1 1 100%;justify-content:flex-start}
.searchbox{display:flex;align-items:center;gap:6px;background:#F7F9FD;border:1px solid var(--line);
  border-radius:10px;padding:0 10px;height:34px;flex:0 1 auto;min-width:0}
.searchbox input{border:0;background:transparent;outline:none;font:inherit;font-size:12.5px;
  width:clamp(84px,12vw,170px);min-width:0;color:var(--ink)}
.searchbox input::placeholder{color:#98A2B3}
.searchbox .clr{border:0;background:transparent;color:var(--ink3);cursor:pointer;font-size:14px;line-height:1;padding:2px}
.btn{height:34px;padding:0 11px;border-radius:10px;background:#FFF;border:1px solid var(--line);white-space:nowrap;flex:none;
  color:var(--ink);font-size:12.5px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;
  box-shadow:0 1px 2px rgba(11,18,32,.04);transition:background .15s,border-color .15s}
.btn:hover{background:#F8FAFF;border-color:#C7D2E6}
.btn.on{background:var(--brandSoft);border-color:#D5E0FF;color:var(--brandH);font-weight:600}
#btnHome{width:34px;min-width:34px;padding:0;justify-content:center}
#btnHome svg{width:16px;height:16px;display:block}
.btn.danger{color:var(--danger);border-color:#F5CDC7}
.btn.danger:hover{background:#FFF4F2}
.btn:disabled{opacity:.55;cursor:not-allowed}

.msgs{flex:1;min-height:0;overflow:auto;padding:18px 18px 8px;background:var(--surf2);
  display:flex;flex-direction:column;gap:10px}
.day{align-self:center;font-size:10.5px;color:var(--ink3);background:#fff;border:1px solid var(--line);
  border-radius:999px;padding:3px 12px;margin:4px 0}
.msg{display:flex;gap:10px;max-width:min(78%,900px)}
.msg .av{width:30px;height:30px;border-radius:50%;flex:none;display:grid;place-items:center;color:#fff;font-size:12px;font-weight:600;margin-top:2px}
.bub{background:#FFF;border:1px solid var(--line);border-radius:14px;padding:9px 13px;box-shadow:0 1px 2px rgba(11,18,32,.04);min-width:0}
.bub .meta{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--ink3);margin-bottom:2px}
.bub .meta b{color:var(--ink);font-size:12px;font-weight:600}
.bub .txt{font-size:13.5px;line-height:1.55;white-space:pre-wrap;word-break:break-word}
.msg.me{align-self:flex-end;flex-direction:row-reverse}
.msg.me .bub{background:var(--brand);border-color:var(--brand);color:#fff;border-bottom-right-radius:6px}
.msg.me .bub .meta{color:rgba(255,255,255,.85)}
.msg.me .bub .meta b{color:#fff}
.msg.err .bub{background:#FFF4F2;border-color:#F5CDC7;color:#A3322B}
.msg.sys{align-self:center;max-width:90%}
.srchint{align-self:stretch;background:#EEF3FF;border:1px solid #D5E0FF;color:#1F57E0;
  border-radius:10px;padding:8px 12px;font-size:12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.srchint button{margin-left:auto}
.typing{align-self:flex-start;display:flex;gap:8px;align-items:center;color:var(--ink3);font-size:12px;padding:2px 4px}
.typing .d{display:inline-flex;gap:3px}
.typing .d i{width:5px;height:5px;border-radius:50%;background:#AEB9CB;animation:bl 1.2s infinite}
.typing .d i:nth-child(2){animation-delay:.15s}.typing .d i:nth-child(3){animation-delay:.3s}
@keyframes bl{0%,60%,100%{opacity:.35;transform:translateY(0)}30%{opacity:1;transform:translateY(-2px)}}

.mention{background:#EEF3FF;color:#1F57E0;border-radius:6px;padding:0 5px;font-weight:600}
.msg.me .mention{background:rgba(255,255,255,.22);color:#fff}
.mention.dim{opacity:.6}
mark{background:#FFF3C4;color:inherit;border-radius:3px;padding:0 2px}
.msg.me mark{background:rgba(255,255,255,.35);color:#fff}

.composer{border-top:1px solid var(--line);background:var(--surf);border-radius:0 0 18px 18px;padding:12px 14px 14px}
.targets{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-bottom:8px;min-height:26px}
.targets .lb{font-size:11px;color:var(--ink3)}
.tag{height:24px;padding:0 9px;border-radius:999px;border:1px solid var(--line);background:#fff;
  font-size:11px;color:var(--ink2);display:inline-flex;align-items:center;gap:5px;cursor:pointer;user-select:none}
.tag .d{width:6px;height:6px;border-radius:50%;background:#CBD5E1}
.tag.on{background:var(--brandSoft);border-color:#D5E0FF;color:var(--brandH);font-weight:600}
.tag.on .d{background:var(--brand)}
.inputrow{display:flex;gap:10px;align-items:flex-end}
textarea{flex:1;min-height:44px;max-height:140px;resize:none;border:1px solid var(--line);border-radius:12px;
  padding:11px 13px;font:inherit;font-size:13.5px;color:var(--ink);background:#fff;outline:none}
textarea:focus{border-color:#9DB6FF;box-shadow:0 0 0 3px rgba(47,107,255,.14)}
textarea::placeholder{color:#98A2B3}
.send{height:44px;min-width:86px;border-radius:12px;border:1px solid var(--brand);background:var(--brand);
  color:#fff;font-weight:600;font-size:13px;cursor:pointer;box-shadow:0 6px 16px rgba(47,107,255,.28)}
.send:hover{background:var(--brandH)}
.send:disabled{opacity:.5;cursor:not-allowed;box-shadow:none}
.foot{display:flex;gap:8px;align-items:center;font-size:10.5px;color:var(--ink3);padding:6px 2px 0;flex-wrap:wrap}
.foot .kbd{background:#fff;border:1px solid var(--line);border-radius:5px;padding:0 4px;font-size:10px}
@media (max-width:1240px){
  .hd .st{display:none}
  .searchbox input{width:110px}
  .btn{padding:0 9px}
}
@media (max-width:900px){
  html,body{max-width:100vw;overflow-x:hidden}
  body{flex-direction:column;overflow-x:hidden}
  .main,.chat,.msgs,.composer,.hd,.hd .right{max-width:100%;min-width:0}
  .hd{flex-wrap:wrap !important}
  .hd .right{flex-wrap:wrap !important;justify-content:flex-start}
  .hd .right .btn{flex:0 1 auto;min-width:0;padding:0 8px;font-size:11.5px}
  .msg,.bub{max-width:100%}
  .side{width:auto;flex:none;flex-direction:row;overflow-x:auto;padding:8px 10px;gap:8px}
  .side .brand,.side .card{display:none}
  .main{padding:0 8px 8px;min-width:0}
  .chat{min-width:0}
  .msgs{min-width:0;padding:14px 12px 8px}
  .msg{max-width:92%}
  /* header 喺手機可以換行，唔好橫向爆 */
  .hd{flex-wrap:wrap;padding:10px 12px;gap:8px}
  .hd h1{flex:1 1 100%;white-space:normal;overflow:visible}
  .hd .right{margin-left:0;flex:1 1 100%;flex-wrap:wrap;gap:6px}
  .searchbox{flex:1 1 140px;order:-1}
  .searchbox input{width:100%}
  .btn{padding:0 9px;font-size:12px}
  .composer{padding:10px}
  .foot{font-size:10px}
}

/* 成員原頭像 */
img.av{object-fit:cover;background:#EEF1F6}
.mem img.av{width:32px;height:32px;border-radius:50%;flex:none;display:block;border:1px solid rgba(15,23,42,.06)}
.msg img.av{width:30px;height:30px;border-radius:50%;flex:none;display:block;margin-top:2px;border:1px solid rgba(15,23,42,.06)}

/* ── 檔案附件 Phase 1 ───────────────────────────────────────── */
.attach{width:34px;height:34px;border-radius:10px;border:1px solid var(--line,#D7DEEA);background:#fff;cursor:pointer;
        font-size:16px;line-height:1;display:grid;place-items:center;flex:none;padding:0}
.attach:hover{background:#F1F5FF;border-color:#9DB6FF}
.composer.drag{outline:2px dashed #6C8CFF;outline-offset:3px;background:#F5F8FF;border-radius:12px}
.att-chips{display:flex;flex-wrap:wrap;gap:6px;margin:2px 0 8px}
.att-chip{display:inline-flex;align-items:center;gap:6px;max-width:100%;padding:4px 8px;border-radius:8px;
          background:#F1F4FA;border:1px solid #DDE4F0;font-size:11.5px;color:#33415C}
.att-chip.uploading{opacity:.72}
.att-chip .ic{font-size:13px}
.att-chip .nm{max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-chip .x{cursor:pointer;color:#8A94A6;padding:0 2px}
.att-chip .x:hover{color:#D14343}
.att-list{display:flex;flex-direction:column;gap:6px;margin-top:8px}
.att-item{display:flex;align-items:center;gap:9px;text-align:left;padding:7px 10px;border-radius:10px;
          border:1px solid #DFE5F0;background:#F8FAFF;cursor:pointer;max-width:420px;font:inherit;color:inherit}
.att-item:hover{border-color:#9DB6FF;background:#F1F6FF}
.att-item .ic{font-size:18px;flex:none}
.att-item .nm{display:flex;flex-direction:column;min-width:0}
.att-item .nm b{font-weight:600;font-size:12.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-item .nm small{color:#8A94A6;font-size:10.5px}

/* 預覽 modal */
.att-modal{position:fixed;inset:0;z-index:9999;background:rgba(8,12,22,.62);backdrop-filter:blur(3px);
           display:flex;align-items:center;justify-content:center;padding:24px}
.att-panel{width:min(1100px,94vw);max-height:92vh;display:flex;flex-direction:column;background:#fff;border-radius:16px;
           box-shadow:0 30px 80px rgba(0,0,0,.4);overflow:hidden}
.att-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border-bottom:1px solid #E6EAF2}
.att-title{display:flex;align-items:center;gap:8px;min-width:0}
.att-title .ic{font-size:18px}
.att-title b{font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-title .sz{color:#8A94A6;font-size:11px}
.att-actions{display:flex;gap:8px;flex:none}
.att-btn{display:inline-flex;align-items:center;gap:5px;padding:6px 10px;border-radius:8px;border:1px solid #D7DEEA;
         background:#fff;color:#1F2937;font-size:12px;cursor:pointer;text-decoration:none}
.att-btn:hover{background:#F3F6FC;border-color:#9DB6FF}
.att-body{flex:1;overflow:auto;padding:14px 16px 18px;display:flex;flex-direction:column;align-items:center;gap:10px;background:#FAFBFE}
.att-img{max-width:100%;max-height:70vh;border-radius:8px;box-shadow:0 6px 20px rgba(16,24,40,.12)}
.att-video{max-width:100%;max-height:70vh;border-radius:8px}
.att-audio{width:min(520px,80%);margin-top:30px}
.att-pdf{width:100%;height:70vh;border:1px solid #E6EAF2;border-radius:8px;background:#fff}
.att-text{width:100%;margin:0;padding:14px;border-radius:10px;border:1px solid #E6EAF2;background:#fff;
          font:12.5px/1.6 ui-monospace,Consolas,"Microsoft JhengHei",monospace;white-space:pre-wrap;word-break:break-word;color:#1F2937;text-align:left}
.att-other{display:flex;flex-direction:column;align-items:center;gap:12px;padding:40px 10px;color:#64748B;font-size:13px}


/* 附件卡喺「我」（藍氣泡）入面：文字要轉深色 */
.me .att-item{background:#F8FAFF;color:#1F2937;border-color:#D7E0F0}
.me .att-item .nm b{color:#1F2937}
.me .att-item .nm small{color:#64748B}
.me .att-item:hover{background:#EEF4FF;border-color:#9DB6FF}

/* Phase 2：縮圖／進度條／Office 預覽 */
.att-thumb{width:44px;height:44px;object-fit:cover;border-radius:8px;flex:none;border:1px solid #DDE4F0;background:#F1F4FA}
.att-bar{position:relative;display:inline-block;width:64px;height:5px;border-radius:3px;background:#E3E9F2;overflow:hidden;flex:none}
.att-bar i{position:absolute;left:0;top:0;bottom:0;display:block;background:linear-gradient(90deg,#6C8CFF,#38D9F5);border-radius:3px;transition:width .15s}
.att-office{width:100%;height:70vh;border:1px solid #E6EAF2;border-radius:8px;background:#fff}

/* Phase 3：檔案 Drawer */
.drawer{position:fixed;right:0;top:0;bottom:0;width:380px;max-width:92vw;z-index:9000;display:flex;flex-direction:column;
        background:#fff;border-left:1px solid #E3E9F2;box-shadow:-18px 0 50px rgba(16,24,40,.18)}
.drawer-hd{display:flex;align-items:center;gap:8px;padding:12px 14px;border-bottom:1px solid #E6EAF2}
.drawer-hd b{font-size:13.5px}
.drawer-hd .grow{flex:1}
.dbtn{border:1px solid #D7DEEA;background:#fff;border-radius:8px;padding:5px 9px;font-size:12px;cursor:pointer}
.dbtn:hover{background:#F1F6FF;border-color:#9DB6FF}
.drawer-tabs{display:flex;gap:4px;padding:8px 10px;border-bottom:1px solid #EEF2F8}
.drawer-tabs button{flex:1;border:1px solid transparent;background:transparent;border-radius:8px;padding:6px 4px;font-size:11.5px;color:#64748B;cursor:pointer;white-space:nowrap}
.drawer-tabs button.on{background:#EEF4FF;border-color:#C9D8FF;color:#1F57E0;font-weight:600}
.drawer-list{flex:1;overflow:auto;padding:8px 10px 18px}
.drawer-count{color:#8A94A6;font-size:10.5px;margin:4px 2px 8px}
.drawer-empty{color:#8A94A6;font-size:12px;text-align:center;padding:30px 0}
.dfile{display:flex;align-items:center;gap:9px;padding:7px 8px;border-radius:10px;border:1px solid transparent}
.dfile:hover{background:#F7FAFF;border-color:#E3ECFA}
.dfile-thumb{width:34px;height:34px;object-fit:cover;border-radius:7px;border:1px solid #DDE4F0;flex:none}
.dfile-ic{width:34px;height:34px;display:grid;place-items:center;border-radius:7px;background:#F1F4FA;font-size:16px;flex:none}
.dfile-info{flex:1;min-width:0;display:flex;flex-direction:column}
.dfile-name{font-size:12px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dfile-meta{color:#8A94A6;font-size:10px;margin-top:2px}
.dfile-acts{display:flex;gap:4px;flex:none}
.dact{border:1px solid #DCE3EF;background:#fff;border-radius:6px;padding:3px 6px;font-size:10.5px;color:#33415C;cursor:pointer;text-decoration:none}
.dact:hover{background:#F1F6FF;border-color:#9DB6FF}
.dact.danger{color:#C0392B;border-color:#F0D2CE}
.dact.danger:hover{background:#FFF2F0}

/* Markdown 渲染 */
.att-md-wrap{width:100%}
.md{width:100%;background:#fff;border:1px solid #E6EAF2;border-radius:10px;padding:18px 22px;font-size:13px;line-height:1.7;color:#1F2937;text-align:left;overflow:auto;max-height:68vh}
.md h1,.md h2,.md h3,.md h4{margin:14px 0 8px;line-height:1.35}
.md h1{font-size:20px} .md h2{font-size:17px} .md h3{font-size:15px}
.md p{margin:8px 0}
.md ul,.md ol{margin:8px 0 8px 22px;padding:0}
.md li{margin:3px 0}
.md code{background:#F1F4FA;border-radius:4px;padding:1px 5px;font:12px ui-monospace,Consolas,monospace}
.md pre{background:#0F172A;color:#E2E8F0;border-radius:8px;padding:12px 14px;overflow:auto;margin:10px 0}
.md pre code{background:none;color:inherit;padding:0}
.md blockquote{margin:10px 0;padding:6px 12px;border-left:3px solid #9DB6FF;background:#F7FAFF;color:#475569}
.md table{border-collapse:collapse;margin:10px 0;font-size:12px}
.md td,.md th{border:1px solid #D7DEEA;padding:4px 8px}
.md th{background:#F1F5FB}
.md a{color:#1F57E0;text-decoration:none}
.md a:hover{text-decoration:underline}
.md hr{border:0;border-top:1px solid #E6EAF2;margin:14px 0}

/* Phase 4 */
.drawer-searchbar{display:flex;gap:6px;padding:8px 10px;border-bottom:1px solid #EEF2F8}
.drawer-searchbar input{flex:1;min-width:0;border:1px solid #D7DEEA;border-radius:8px;padding:5px 9px;font-size:12px;outline:none}
.drawer-searchbar input:focus{border-color:#9DB6FF;box-shadow:0 0 0 3px rgba(108,140,255,.12)}
.drawer-filters{display:flex;gap:5px;padding:6px 10px;border-bottom:1px solid #EEF2F8;flex-wrap:wrap}
.fchip{border:1px solid #DDE4F0;background:#fff;border-radius:999px;padding:3px 9px;font-size:10.5px;color:#475569;cursor:pointer}
.fchip.on{background:#EEF4FF;border-color:#C9D8FF;color:#1F57E0;font-weight:600}
.dfile-snippet{display:block;color:#64748B;font-size:10px;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:210px}
.dact.on{background:#FFF8E5;border-color:#E9C86A;color:#8A6D2F}
.md-img{max-width:100%;border-radius:8px;margin:8px 0;box-shadow:0 4px 14px rgba(16,24,40,.10);display:block}
.md .tok-kw{color:#C792EA}
.md .tok-str{color:#A5E075}
.md .tok-com{color:#7F8EA3;font-style:italic}
.md .tok-num{color:#F6C177}

/* Phase 5：Drawer 推開式（唔遮蓋主頁面） */
body.drawer-open .main{margin-right:380px;transition:margin-right .2s ease}
@media (max-width:1000px){ body.drawer-open .main{margin-right:0} }
.drawer-handle{position:fixed;right:0;top:42%;z-index:8000;width:34px;height:74px;border-radius:12px 0 0 12px;
  border:1px solid #D7DEEA;border-right:0;background:#fff;box-shadow:-8px 0 22px rgba(16,24,40,.14);
  font-size:16px;cursor:pointer;display:grid;place-items:center;color:#33415C}
.drawer-handle:hover{background:#F1F6FF;border-color:#9DB6FF}
.drawer-handle[hidden]{display:none !important}
.drawer-searchbar select{border:1px solid #D7DEEA;border-radius:8px;padding:4px 4px;font-size:11px;background:#fff;color:#33415C;outline:none;flex:none}
.att-pin{border:0;background:transparent;cursor:pointer;font-size:14px;line-height:1;padding:0 2px;color:#94A3B8;flex:none}
.att-pin:hover{color:#C39A4E;transform:scale(1.15)}
.att-pin.on{color:#C39A4E}


/* 修正：hidden 屬性要蓋過 .drawer{display:flex} */
.drawer[hidden]{display:none !important}

/* Phase 6：Markdown 編輯器／版本／搜尋 highlight */
mark{background:#FFE9A8;color:#7A5B00;border-radius:3px;padding:0 2px}
.md-edit{width:100%;display:flex;flex-direction:column;gap:10px}
.md-edit-bar{display:flex;gap:8px;justify-content:flex-end}
.att-btn.primary{background:#2F6BFF;border-color:#2F6BFF;color:#fff}
.att-btn.primary:hover{background:#1F57E0;border-color:#1F57E0}
.md-ta{width:100%;min-height:220px;max-height:46vh;resize:vertical;border:1px solid #D7DEEA;border-radius:10px;
  padding:12px 14px;font:12.5px/1.7 ui-monospace,Consolas,"Microsoft JhengHei",monospace;background:#fff;color:#1F2937;outline:none}
.md-ta:focus{border-color:#6C8CFF;box-shadow:0 0 0 3px rgba(108,140,255,.15)}
.md-live{max-height:42vh;overflow:auto}
.md-versions{width:100%;display:flex;flex-direction:column;gap:6px;background:#fff;border:1px solid #E6EAF2;border-radius:10px;padding:14px 16px}
.md-versions-hd{font-size:12px;font-weight:600;color:#33415C;margin-bottom:4px}
.md-version{display:flex;align-items:center;gap:12px;padding:6px 4px;border-bottom:1px dashed #EEF2F8;font-size:12px;color:#33415C}
.md-version:last-child{border-bottom:0}
.md-version .sz{color:#8A94A6;font-size:10.5px;flex:1}

/* Phase 7：版本 diff／搜尋分頁 */
.md-diff{width:100%;display:flex;flex-direction:column;gap:8px}
.md-diff-hd{display:flex;align-items:center;gap:12px;font-size:12px;color:#33415C;flex-wrap:wrap}
.md-diff-hd .sz{color:#8A94A6;font-size:10.5px;flex:1}
.md-diff-body{max-height:62vh;overflow:auto;background:#fff;border:1px solid #E6EAF2;border-radius:10px;padding:8px 0;font:12px/1.6 ui-monospace,Consolas,"Microsoft JhengHei",monospace}
.dline{display:flex;gap:8px;padding:1px 12px;white-space:pre-wrap;word-break:break-word}
.dline .sign{width:12px;flex:none;color:#8A94A6}
.dline .txt{flex:1}
.dline.add{background:#E9F8EF;color:#0F6B3E}
.dline.add .sign{color:#0F6B3E}
.dline.del{background:#FDECEA;color:#9B2C20}
.dline.del .sign{color:#9B2C20}

/* Phase 8：Office 編輯器／搜尋篩選／Diff 並排 */
.drawer-searchbar select{max-width:96px}
.office-edit{width:100%;display:flex;flex-direction:column;gap:10px;max-height:70vh;overflow:auto}
.office-edit-bar{display:flex;align-items:center;gap:8px;position:sticky;top:0;background:#fff;padding:4px 0;z-index:2}
.office-kind{font-size:12px;font-weight:600;color:#33415C;flex:1}
.office-note{font-size:10.5px;color:#8A94A6}
.office-paras,.office-slides{display:flex;flex-direction:column;gap:6px}
.office-slides{gap:14px}
.office-slide{border:1px solid #EEF2F8;border-radius:10px;padding:8px 10px;display:flex;flex-direction:column;gap:6px}
.office-slide-hd{font-size:11px;font-weight:600;color:#475569}
.office-ta{width:100%;border:1px solid #D7DEEA;border-radius:8px;padding:8px 10px;font:12px/1.6 ui-monospace,Consolas,"Microsoft JhengHei",monospace;resize:vertical;outline:none}
.office-ta:focus{border-color:#6C8CFF;box-shadow:0 0 0 3px rgba(108,140,255,.12)}
.office-tabs{display:flex;gap:4px;flex-wrap:wrap}
.office-tab{border:1px solid #DDE4F0;background:#fff;border-radius:7px;padding:4px 10px;font-size:11px;cursor:pointer;color:#475569}
.office-tab.on{background:#EEF4FF;border-color:#C9D8FF;color:#1F57E0;font-weight:600}
.office-grid-box{overflow:auto;border:1px solid #E6EAF2;border-radius:10px;max-height:52vh}
.office-grid{border-collapse:collapse;font-size:11.5px}
.office-grid th{background:#F1F5FB;color:#64748B;font-weight:500;padding:2px 6px;border:1px solid #E6EAF2;position:sticky;top:0}
.office-grid td{border:1px solid #EEF2F8;padding:0}
.office-grid input{width:110px;border:0;outline:none;padding:5px 7px;font-size:11.5px;background:transparent}
.office-grid input:focus{background:#EEF4FF}
.dside{display:flex;gap:10px;max-height:62vh;overflow:auto;align-items:flex-start}
.dside-col{flex:1;min-width:0;background:#fff;border:1px solid #E6EAF2;border-radius:10px;overflow:auto;max-height:62vh}
.dside-hd{position:sticky;top:0;background:#F7FAFF;border-bottom:1px solid #E6EAF2;padding:5px 10px;font-size:10.5px;color:#64748B;font-weight:600;z-index:1}
.dline .txt{white-space:pre-wrap;word-break:break-word}

/* Phase 9：字元級 diff／排序 */
.wd-del{background:#FBC9C2;color:#8C2418;border-radius:2px;text-decoration:line-through}
.wd-ins{background:#BFE9CF;color:#0C5A2E;border-radius:2px}
.att-btn.on{background:#2F6BFF;border-color:#2F6BFF;color:#fff}
.dline.del .wd-del{background:#F5A79B}
.dline.add .wd-ins{background:#9FDCB4}

/* Phase 10：搜尋分頁 */
.drawer-pager{display:flex;align-items:center;gap:6px;margin-top:10px;padding:6px 2px;flex-wrap:wrap}
.drawer-pageinfo{flex:1;text-align:center;font-size:10.5px;color:#8A94A6}

/* Phase 11：拆行／合行標記、頁碼 */
.dnote{font-size:9.5px;color:#8A6D2F;background:#FFF6DD;border:1px solid #F0DFAC;border-radius:5px;padding:0 4px;margin-left:6px;flex:none}
.drawer-pager .dact.on{background:#EEF4FF;border-color:#C9D8FF;color:#1F57E0;font-weight:600}
.drawer-pager .dact:disabled{opacity:.4;cursor:default}

/* Phase 12：搜尋記憶 chip */
.drawer-last{display:flex;align-items:center;gap:6px;padding:6px 10px;border-bottom:1px solid #EEF2F8;background:#FBFDFF}
.drawer-last .last-info{flex:1;font-size:10.5px;color:#64748B;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.drawer-last .dact{padding:2px 7px;font-size:10.5px}

/* Phase 13：docx run 格式按鈕 */
.office-para-row{display:flex;gap:8px;align-items:flex-start}
.office-para-row .office-ta{flex:1}
.office-fmt-box{display:flex;gap:4px;flex:none;padding-top:2px}
.office-fmt{border:1px solid #D7DEEA;background:#fff;border-radius:6px;width:26px;height:26px;font-size:12px;font-weight:700;cursor:pointer;color:#475569}
.office-fmt.on{background:#2F6BFF;border-color:#2F6BFF;color:#fff}
.office-fmt:hover{border-color:#9DB6FF}

/* Phase 14：逐 run 編輯／歷史 pin */
.office-para-box{display:flex;flex-direction:column;gap:4px;border-bottom:1px dashed #EEF2F8;padding-bottom:6px}
.office-runs{display:flex;flex-direction:column;gap:4px;padding:6px 8px;background:#F8FAFF;border:1px solid #E6EAF2;border-radius:8px}
.office-run-row{display:flex;gap:4px;align-items:center}
.office-run-text{flex:1;border:1px solid #D7DEEA;border-radius:6px;padding:4px 7px;font-size:11.5px;outline:none}
.office-run-text:focus{border-color:#6C8CFF}
.drawer-last .dact.pinned{background:#FFF8E5;border-color:#E9C86A;color:#8A6D2F;font-weight:600}

/* Phase 17：run 字級／顏色／字型 */
.office-run-size{width:52px;border:1px solid #D7DEEA;border-radius:6px;padding:3px 4px;font-size:11px}
.office-run-color{width:30px;height:26px;border:1px solid #D7DEEA;border-radius:6px;padding:1px;background:#fff}
.office-run-font{width:110px;border:1px solid #D7DEEA;border-radius:6px;padding:3px 6px;font-size:11px}

/* Phase 18：段落行距 */
.office-spacing{border:1px solid #D7DEEA;border-radius:6px;padding:3px 4px;font-size:11px;background:#fff;color:#33415C;max-width:64px}

/* Phase 23：多用戶 auth UI */
.role-chip{font-size:10px;font-weight:500;color:#8A5A00;background:#FFF6DD;border:1px solid #F0DFAC;border-radius:999px;padding:1px 8px;vertical-align:middle}
body.role-viewer #btnSend,body.role-viewer #btnAttach{display:none}
body.role-viewer #drawerUpload,body.role-viewer #drawerMkdir,body.role-viewer .dact.danger{display:none}
.auth-modal{z-index:9500}
.auth-panel{width:min(520px,92vw);max-height:82vh;overflow:auto;background:#fff;border-radius:16px;padding:16px 18px;box-shadow:0 24px 70px rgba(16,24,40,.28);display:flex;flex-direction:column;gap:10px}
.auth-hd{display:flex;align-items:center;justify-content:space-between;font-size:14px}
.auth-form{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.auth-form input,.auth-form select{border:1px solid #D7DEEA;border-radius:8px;padding:7px 10px;font-size:12px;outline:none;min-width:110px}
.auth-form input:focus{border-color:#6C8CFF}
.auth-note{font-size:10.5px;color:#8A94A6;width:100%}
.auth-users{display:flex;flex-direction:column;gap:6px}
.auth-user{display:flex;align-items:center;gap:8px;border:1px solid #EEF2F8;border-radius:8px;padding:6px 8px}
.auth-uname{flex:1;font-size:12px;color:#33415C;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* Phase 24：訊息 by 標記 */
.by-tag{font-size:10px;color:#8A94A6;margin-left:4px}

/* Phase 27：在線狀態／audit 圖表 */
.presence-chip{font-size:10px;font-weight:500;color:#0F7B4F;background:#E8F7EF;border:1px solid #BEE8D2;border-radius:999px;padding:1px 8px;vertical-align:middle;cursor:pointer}
.presence-chip:hover{background:#D8F0E4}
.audit-bars{display:flex;flex-direction:column;gap:4px;width:100%;margin-top:4px}
.audit-bar-row{display:flex;align-items:center;gap:6px;font-size:10.5px;color:#5B6B85}
.audit-bar-label{width:74px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.audit-bar-track{flex:1;height:8px;background:#EEF2F8;border-radius:99px;overflow:hidden}
.audit-bar-fill{display:block;height:100%;background:linear-gradient(90deg,#6C8CFF,#8F6CFF);border-radius:99px}
.audit-bar-num{width:22px;text-align:right;font-variant-numeric:tabular-nums}

/* Phase 30：已讀 chip */
.read-chip{font-size:10px;font-weight:500;color:#1F5FAF;background:#E8F0FE;border:1px solid #BFD5F7;border-radius:999px;padding:1px 8px;vertical-align:middle;cursor:pointer}
.read-chip:hover{background:#D8E7FD}

/* Phase 30：深色主題 */
body.theme-dark{background:#0F1420;color:#DCE5F2}
body.theme-dark .side{background:#141B2A;border-color:#22304A}
body.theme-dark .main{background:#0F1420}
body.theme-dark header{background:#141B2A;border-color:#22304A}
body.theme-dark .brand b,body.theme-dark .brand small{color:#DCE5F2}
body.theme-dark .btn{background:#1B2436;border-color:#2A3A58;color:#C9D6EA}
body.theme-dark .btn:hover{background:#22304A}
body.theme-dark .mem{color:#C9D6EA}
body.theme-dark .mem.sel{background:#1D2B45}
body.theme-dark .mem .nm b{color:#E6EEF9}
body.theme-dark .bub{background:#182236;border-color:#25334D;color:#E2EAF6}
body.theme-dark .msg.me .bub{background:#2B4D8F;color:#fff}
body.theme-dark .meta b{color:#E6EEF9}
body.theme-dark .meta .role,body.theme-dark .meta span{color:#93A5BF}
body.theme-dark .composer{background:#141B2A;border-color:#22304A}
body.theme-dark #inp{background:#0F1420;border-color:#2A3A58;color:#E6EEF9}
body.theme-dark .drawer{background:#141B2A;border-color:#22304A}
body.theme-dark .drawer *{color:#DCE5F2}
body.theme-dark .drawer input,body.theme-dark .drawer select{background:#0F1420;border-color:#2A3A58;color:#E6EEF9}
body.theme-dark .dfile:hover{background:#1B2436}
body.theme-dark .auth-panel{background:#141B2A;color:#DCE5F2}
body.theme-dark .auth-form input,body.theme-dark .auth-form select,body.theme-dark .office-spacing{background:#0F1420;border-color:#2A3A58;color:#E6EEF9}
body.theme-dark .att-modal{background:rgba(5,10,20,.72)}
body.theme-dark .att-panel{background:#141B2A;color:#DCE5F2}
body.theme-dark .day{color:#7E93B3}
body.theme-dark .foot{background:#0F1420;color:#7E93B3}
body.theme-dark .msg .txt code{background:#22304A}
body.theme-dark .office-grid th{background:#22304A;color:#DCE5F2}
body.theme-dark .office-grid td input{background:#0F1420;color:#E6EEF9;border-color:#2A3A58}

/* ═══════════ Phase 34：手機端響應式（≤760px）═══════════ */
.mobile-only{display:none}
.side-overlay{position:fixed;inset:0;background:rgba(10,18,32,.42);z-index:880;backdrop-filter:blur(1px)}
.side-overlay[hidden]{display:none}

@media (max-width: 900px) {
  .mobile-only{display:inline-flex}
  html,body{height:100%}
  body{overflow:hidden}
  .side{position:fixed;left:0;top:0;bottom:0;width:min(300px,86vw);max-width:86vw;z-index:900;transform:translateX(-102%);transition:transform .22s ease;overflow-y:auto;box-shadow:none;flex-direction:column;gap:0;padding:0;background:#fff}
  body.sidebar-open .side{transform:translateX(0);box-shadow:0 20px 60px rgba(10,18,32,.35)}
  .main{margin:0;padding:0;height:100dvh;min-height:0}
  .chat{border-radius:0;height:100dvh;display:flex;flex-direction:column}
  .hd{flex-wrap:wrap;gap:6px;padding:8px 10px;flex:none}
  .hd h1{font-size:14.5px;line-height:1.3;flex:1 1 100%;white-space:normal}
  .hd h1 .st{font-size:10px}
  .hd .right{width:100%;justify-content:flex-start;gap:5px;flex-wrap:wrap}
  .searchbox{flex:1 1 120px;min-width:110px;order:-1}
  .btn{font-size:11px;padding:5px 8px;border-radius:8px}
  .msgs{padding:10px 10px 4px;flex:1;min-height:0;overflow-y:auto}
  .msg{max-width:94%}
  .msg .bub{max-width:100%;font-size:13px;padding:8px 10px}
  .composer{padding:8px;flex:none}
  .targets{gap:5px;max-height:none;overflow-x:auto;flex-wrap:nowrap;padding-bottom:4px;align-items:center;scrollbar-width:none}
  .targets::-webkit-scrollbar{display:none}
  .targets .lb{flex:none;white-space:nowrap;font-size:10px}
  .tag{font-size:10px;padding:3px 7px;white-space:nowrap;flex:none}
  #inp{font-size:14px;min-height:38px}
  .send{min-width:64px;font-size:13px;padding:8px 14px}
  .foot{font-size:10px;padding:6px 10px;line-height:1.4}
  .drawer{width:100vw;max-width:100vw;right:0!important}
  .drawer.open{transform:none}
  .att-panel{width:96vw;max-width:96vw;max-height:88vh}
  .auth-panel{width:94vw;max-height:86vh}
  .office-editor{width:96vw;max-width:96vw}
  .day{font-size:10px}
  .av{width:30px;height:30px}
  body.drawer-open .main{margin-right:0!important}
  body.theme-dark .side{background:#141B2A}
}

/* Phase 35：手機快速連線 QR */
.qr-modal{z-index:9600}
.qr-panel{width:min(560px,94vw);max-height:88vh;overflow:auto;background:#fff;border-radius:16px;padding:16px 18px;box-shadow:0 24px 70px rgba(16,24,40,.28);display:flex;flex-direction:column;gap:10px}
.qr-hd{display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:600}
.qr-row{display:flex;align-items:center;gap:14px;border:1px solid #E2E9F5;border-radius:14px;padding:14px;margin-top:22px;background:#FAFCFF}
.qr-row:first-of-type{margin-top:14px}
.qr-row + .qr-row{margin-top:22px}
.qr-img{width:150px;height:150px;border-radius:8px;border:1px solid #E7EDF7;background:#fff;flex:none;image-rendering:pixelated}
.qr-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}
.qr-url{font-size:12px;color:#2F6BFF;word-break:break-all;font-family:ui-monospace,Consolas,monospace}
.qr-tip{font-size:10.5px;color:#8A94A6;line-height:1.45}
.qr-copy{border:1px solid #D7DEEA;background:#fff;border-radius:8px;font-size:11px;padding:4px 9px;cursor:pointer;align-self:flex-start}
.qr-copy:hover{border-color:#6C8CFF;color:#2F6BFF}
.qr-note{font-size:10.5px;color:#8A94A6;background:#F7F9FD;border-radius:10px;padding:8px 10px;line-height:1.55}
body.theme-dark .qr-panel{background:#141B2A;color:#DCE5F2}
body.theme-dark .qr-row{border-color:#25334D}
body.theme-dark .qr-url{color:#9DB8FF}
body.theme-dark .qr-note{background:#1B2436;color:#93A5BF}
body.theme-dark .qr-copy{background:#1B2436;border-color:#2A3A58;color:#C9D6EA}
@media (max-width: 900px){ .qr-img{width:120px;height:120px} .qr-row{gap:8px;padding:8px} .qr-panel{padding:12px} }

/* Phase 36：手機側欄入口（FAB） */
.fab-members{position:fixed;left:12px;bottom:14px;z-index:850;display:none;align-items:center;gap:5px;background:#2F6BFF;color:#fff;border:0;border-radius:999px;padding:9px 13px;font-size:12.5px;font-weight:600;box-shadow:0 8px 22px rgba(47,107,255,.38);cursor:pointer}
.fab-members.show{display:flex}
.fab-members:active{transform:scale(.96)}
body.sidebar-open .fab-members{display:none}
body.theme-dark .fab-members{background:#3D6FE8}
@media (max-width: 900px){ #btnSide{white-space:nowrap} }

/* Phase 36b：手機開啟側欄時必須顯示內容（覆蓋舊手機規則 .side .brand/.card display:none） */
@media (max-width: 900px) {
  body.sidebar-open .side .brand { display: flex !important; }
  body.sidebar-open .side .card { display: block !important; }
  body.sidebar-open .side { background: #fff; }
  body.theme-dark.sidebar-open .side { background: #141B2A; }
}

/* Phase 36c：≤900px 永遠顯示「成員」浮動按鈕（唔靠 JS 判斷） */
@media (max-width: 900px) {
  .fab-members { display: flex; }
  body.sidebar-open .fab-members { display: none !important; }
}

/* ═══════════ Phase 39e：房間切換（工作房／家庭房）═══════════ */
.rooms{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-left:0;width:100%;order:-2}
.room-btn{border:1px solid #D7DEEA;background:#fff;color:#44506B;border-radius:999px;padding:4px 11px;font-size:12px;cursor:pointer;white-space:nowrap;font-family:inherit}
.room-btn:hover{border-color:#6C8CFF;color:#2F6BFF}
.room-btn.on{background:#2F6BFF;border-color:#2F6BFF;color:#fff;font-weight:600}
.room-banner{background:#EFF4FF;color:#2F4C8F;border-bottom:1px solid #D7E2FA;padding:5px 14px;font-size:12px}
body.theme-dark .room-btn{background:#1B2436;border-color:#2A3A58;color:#C9D6EA}
body.theme-dark .room-btn.on{background:#3D6FE8;border-color:#3D6FE8;color:#fff}
body.theme-dark .room-banner{background:#152037;color:#9DB8FF;border-color:#25334D}
@media (max-width:900px){ .rooms{margin-left:0;width:100%;order:-2} .room-banner{padding:5px 10px} }


/* Phase 42：使用指南 modal + 房間建議 chips */
.guide-panel{width:min(520px,92vw);max-height:86vh;overflow:auto;background:var(--surf);border-radius:16px;padding:16px 18px;box-shadow:0 18px 50px rgba(20,30,60,.28)}
.guide-body{white-space:pre-wrap;font-size:13px;line-height:1.75;color:var(--ink);font-family:inherit}
.room-hints{display:flex;align-items:center;gap:6px;flex-wrap:wrap;padding:8px 14px 0;font-size:11.5px;color:var(--ink3)}
.room-hints[hidden]{display:none}
.rh-lb{opacity:.8}
.rh-chip{border:1px solid #D7DEEA;background:#fff;color:#44506B;border-radius:999px;padding:3px 10px;font-size:11.5px;cursor:pointer;font-family:inherit}
.rh-chip:hover{border-color:#6C8CFF;color:#2F6BFF}