:root{--bg:#ffffff;--panel:#f6f8fa;--line:#d8dee4;--ink:#1f2328;--muted:#656d76;--accent:#0969da;--danger:#cf222e;--ok:#1a7f37;--unread:#0969da}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%;background:var(--bg);color:var(--ink);font:14px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}a{color:var(--accent)}button{font:inherit;cursor:pointer}.btn{padding:6px 14px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--ink)}.btn:hover:not(:disabled){background:var(--panel)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){filter:brightness(1.08);background:var(--accent)}input,select,textarea{font:inherit;padding:7px 10px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--ink);width:100%}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}.muted{color:var(--muted)}.err{color:var(--danger)}.ok{color:var(--ok)}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.shell{display:flex;flex-direction:column;height:100vh}.topbar{display:flex;align-items:center;gap:12px;padding:10px 16px;border-bottom:1px solid var(--line);background:var(--panel);flex:none}.brand{font-weight:700}.cols,.spacer{flex:1 1}.cols{display:flex;min-height:0}.list{width:380px;border-right:1px solid var(--line);flex:none}.detail,.list{overflow-y:auto}.detail{flex:1 1;padding:20px 24px;min-width:0}.thread-row{padding:11px 14px;border-bottom:1px solid var(--line);cursor:pointer;display:grid;grid-gap:3px;gap:3px}.thread-row:hover{background:var(--panel)}.thread-row[aria-current=true]{background:#ddf4ff}.thread-row .who{font-weight:600}.thread-row.unread .who:before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--unread);margin-right:7px;vertical-align:middle}.thread-row .subj{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.thread-row .meta{font-size:12px;color:var(--muted)}.msg{border:1px solid var(--line);border-radius:8px;margin-bottom:14px;overflow:hidden}.msg-head{padding:10px 14px;background:var(--panel);border-bottom:1px solid var(--line);font-size:13px}.msg-body{padding:14px;white-space:pre-wrap;word-break:break-word}.msg-body iframe{width:100%;border:0}.translated{margin:0 14px 14px;padding:10px 12px;background:#f0f6ff;border-left:3px solid var(--accent);white-space:pre-wrap}.atts{padding:0 14px 12px;display:flex;flex-wrap:wrap;gap:8px}.att{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid var(--line);border-radius:999px;font-size:13px;text-decoration:none;color:var(--ink);background:var(--bg)}.att:hover{background:var(--panel)}.card{max-width:420px;margin:12vh auto;padding:28px;border:1px solid var(--line);border-radius:10px}.field{display:grid;grid-gap:5px;gap:5px;margin-bottom:14px}.field label{font-size:13px;color:var(--muted)}.compose{display:grid;grid-gap:10px;gap:10px;border:1px solid var(--line);border-radius:8px;padding:14px;margin-top:8px}.row{display:flex;gap:10px;align-items:center}table.admin{width:100%;border-collapse:collapse}table.admin td,table.admin th{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);font-size:13px}table.admin th{color:var(--muted);font-weight:600}.steps{margin:10px 0;display:grid;grid-gap:4px;gap:4px;font-size:13px}.step-ok:before{content:"✓ ";color:var(--ok)}.step-skip:before{content:"· ";color:var(--muted)}.step-fail:before{content:"✗ ";color:var(--danger)}@media (max-width:820px){.cols{flex-direction:column}.list{width:100%;max-height:42vh;border-right:0;border-bottom:1px solid var(--line)}}