*{box-sizing:border-box}
:root{--bg:#f4f6fb;--card:#fff;--line:#e6e9f0;--text:#1f2937;--muted:#8a94a6;--pri:#2563eb;--pri-soft:#eaf1ff;--ok:#16a34a;--err:#dc2626;--warn:#d97706}
html,body{margin:0;height:100%;font:14px/1.5 -apple-system,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;color:var(--text);background:var(--bg)}
.hidden{display:none!important}
.muted{color:var(--muted)}
.err{color:var(--err);min-height:20px}
.btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 14px;cursor:pointer;font-size:14px;color:var(--text)}
.btn:hover{border-color:#c7cfdd}
.btn.primary{background:var(--pri);border-color:var(--pri);color:#fff}
.btn.primary:hover{background:#1d4ed8}
.btn.ghost{border-color:transparent;background:transparent}
.btn.danger{color:var(--err)}
.btn.sm{padding:3px 10px;font-size:13px}
.btn:disabled{opacity:.6;cursor:wait}
.icon-btn{border:0;background:transparent;font-size:18px;cursor:pointer;color:var(--muted);padding:2px 6px;border-radius:6px}
.icon-btn:hover{background:var(--pri-soft);color:var(--pri)}
input,select,textarea{font:inherit;border:1px solid var(--line);border-radius:8px;padding:6px 10px;background:#fff;color:var(--text)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--pri-soft);border-color:var(--pri)}
.login{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#e0e9ff,#f5f7fb)}
.login-card{background:#fff;padding:36px;border-radius:16px;box-shadow:0 10px 40px rgba(30,60,120,.12);width:340px;display:flex;flex-direction:column;gap:12px;text-align:center}
.login-card .logo{font-size:24px;font-weight:700}
.app{height:100vh;display:flex;flex-direction:column}
.topbar{height:56px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 18px}
.topbar .logo{font-size:18px;font-weight:700}
.top-actions{display:flex;gap:8px}
.main{flex:1;display:grid;grid-template-columns:190px 300px 360px 1fr;min-height:0}
.pane{background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;min-width:0}
.pane.groups{background:#fafbfd}
.pane-head{display:flex;align-items:center;gap:8px;padding:10px 12px;border-bottom:1px solid var(--line);min-height:50px;font-weight:600}
.pane-head span{flex:1}
.search{flex:1;min-width:0}
.group-list,.account-list,.msg-list{list-style:none;margin:0;padding:0;overflow:auto;flex:1}
.group-list li{display:flex;align-items:center;padding:9px 14px;cursor:pointer;gap:6px;border-left:3px solid transparent}
.group-list li:hover{background:#f0f3f9}
.group-list li.active{background:var(--pri-soft);border-left-color:var(--pri);color:var(--pri);font-weight:600}
.group-list .name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.group-list .cnt{font-size:12px;color:var(--muted);background:#eef1f6;border-radius:10px;padding:0 7px}
.group-list .ops{display:none;gap:2px}
.group-list li:hover .ops{display:flex}
.group-list .ops button{border:0;background:none;cursor:pointer;font-size:12px;color:var(--muted);padding:0 3px}
.batchbar{display:flex;align-items:center;gap:6px;padding:6px 12px;border-bottom:1px solid var(--line);font-size:13px;flex-wrap:wrap}
.batchbar select{padding:3px 6px;font-size:13px;max-width:110px}
.account-list li{display:flex;gap:8px;padding:10px 12px;border-bottom:1px solid #f1f3f7;cursor:pointer;align-items:flex-start}
.account-list li:hover{background:#f7f9fc}
.account-list li.active{background:var(--pri-soft)}
.acc-main{flex:1;min-width:0}
.acc-email{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.acc-sub{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.badge{display:inline-block;font-size:11px;padding:0 6px;border-radius:4px;margin-right:4px;font-weight:500}
.badge.outlook{background:#e0f2fe;color:#0369a1}.badge.gmail{background:#fee2e2;color:#b91c1c}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block;margin-right:5px;background:#cbd5e1}
.dot.ok{background:var(--ok)}.dot.error{background:var(--err)}.dot.checking{background:var(--warn);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.3}}
.acc-ops{display:flex;flex-direction:column;gap:2px;opacity:0}
.account-list li:hover .acc-ops{opacity:1}
.acc-ops button{border:0;background:none;cursor:pointer;color:var(--muted);font-size:12px;padding:0}
.acc-ops button:hover{color:var(--pri)}
.cur-acc{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}
.tabs{display:flex;background:#f1f4f9;border-radius:8px;padding:2px}
.tab{border:0;background:none;padding:4px 10px;border-radius:6px;cursor:pointer;font-size:13px;color:var(--muted)}
.tab.active{background:#fff;color:var(--pri);box-shadow:0 1px 3px rgba(0,0,0,.08)}
.msg-list li{padding:11px 14px;border-bottom:1px solid #f1f3f7;cursor:pointer}
.msg-list li:hover{background:#f7f9fc}
.msg-list li.active{background:var(--pri-soft)}
.msg-list li.unread .m-subj{font-weight:700}
.msg-list li.unread .m-from::before{content:"";display:inline-block;width:7px;height:7px;background:var(--pri);border-radius:50%;margin-right:6px;vertical-align:middle}
.m-top{display:flex;justify-content:space-between;gap:8px;font-size:13px}
.m-from{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#374151}
.m-time{color:var(--muted);font-size:12px;white-space:nowrap}
.m-subj{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:2px}
.m-prev{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.code-chip{display:inline-block;background:#fef3c7;color:#92400e;border-radius:5px;padding:0 6px;font-size:12px;font-weight:700;margin-top:3px;cursor:copy;font-family:monospace}
.empty{padding:40px 16px;text-align:center;color:var(--muted)}
.empty.big{font-size:15px;margin:auto;line-height:2.2}
.empty.big::first-line{font-size:40px}
.detail{border-right:0;overflow:hidden}
.d-head{padding:16px 20px;border-bottom:1px solid var(--line)}
.d-subj{font-size:18px;font-weight:700;margin:0 0 8px;word-break:break-word}
.d-meta{font-size:13px;color:#4b5563;line-height:1.8;word-break:break-all}
.d-meta b{color:var(--muted);font-weight:normal;display:inline-block;width:52px}
.d-body{flex:1;min-height:0;display:flex}
.d-body iframe{border:0;width:100%;flex:1;background:#fff}
.d-body pre{margin:0;padding:20px;white-space:pre-wrap;word-break:break-word;overflow:auto;flex:1;font-family:inherit}
.d-att{padding:8px 20px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.dlg{border:0;border-radius:14px;padding:0;width:min(720px,94vw);box-shadow:0 20px 60px rgba(0,0,0,.25)}
.dlg::backdrop{background:rgba(15,23,42,.35)}
.dlg form{padding:22px 24px}
.dlg h3{margin:0 0 14px}
.dlg .row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.dlg .row label{display:flex;align-items:center;gap:6px;font-size:13px}
.dlg textarea{width:100%;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px}
.dlg-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}
.help pre{background:#f3f5f9;padding:8px 12px;border-radius:8px;overflow:auto;font-size:13px}
.help h4{margin:14px 0 4px}
.help code{background:#f3f5f9;padding:0 4px;border-radius:4px}
.toast{position:fixed;left:50%;bottom:30px;transform:translateX(-50%) translateY(20px);background:#111827;color:#fff;padding:9px 18px;border-radius:8px;opacity:0;transition:.25s;pointer-events:none;z-index:99;max-width:80vw}
.toast.show{opacity:1;transform:translateX(-50%)}
.imp-errs{max-height:140px;overflow:auto;font-size:12px;color:var(--err);margin-top:6px}
@media (max-width:1100px){.main{grid-template-columns:160px 250px 1fr}.detail{position:fixed;inset:56px 0 0 0;z-index:5;display:none}.detail.open{display:flex}}
@media (max-width:720px){.main{grid-template-columns:1fr}.groups{display:none}.messages{display:none}.messages.open{display:flex;position:fixed;inset:56px 0 0 0;z-index:4}.top-actions .ghost{display:none}}
.back-btn{display:none}
@media (max-width:1100px){.back-btn{display:inline-block}}