:root{
  --bg:#ECEFF3; --surface:#FFFFFF; --surface2:#F5F7FA; --ink:#16202B; --muted:#5A6674; --line:#D6DCE4;
  --accent:#2446A8; --accent-ink:#FFFFFF; --accent-soft:#E3E9FA;
  --st-new:#C2410C; --st-wip:#A86A0B; --st-wait:#6A45B0; --st-done:#2E7A4C; --danger:#B42318;
  --note:#FFF6DA; --note-line:#E9D48E; --auto:#EAF3EE; --auto-line:#B6D5C3;
  --shadow:0 8px 28px rgba(18,28,45,.14);
  --sans:"IBM Plex Sans JP","Hiragino Sans","Yu Gothic UI","Meiryo",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  color-scheme:dark;
  --bg:#0E1319; --surface:#151C24; --surface2:#1B242F; --ink:#E4E9EF; --muted:#94A1AF; --line:#2A3542;
  --accent:#86A2FF; --accent-ink:#0E1319; --accent-soft:#1F2B4B;
  --st-new:#F28A5B; --st-wip:#E2B04F; --st-wait:#B69BF0; --st-done:#6CC795; --danger:#F07A6E;
  --note:#2E2913; --note-line:#5C5124; --auto:#15291F; --auto-line:#2D5140; --shadow:0 8px 28px rgba(0,0,0,.45);
}}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0E1319; --surface:#151C24; --surface2:#1B242F; --ink:#E4E9EF; --muted:#94A1AF; --line:#2A3542;
  --accent:#86A2FF; --accent-ink:#0E1319; --accent-soft:#1F2B4B;
  --st-new:#F28A5B; --st-wip:#E2B04F; --st-wait:#B69BF0; --st-done:#6CC795; --danger:#F07A6E;
  --note:#2E2913; --note-line:#5C5124; --auto:#15291F; --auto-line:#2D5140; --shadow:0 8px 28px rgba(0,0,0,.45);
}
html,body{height:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:14px;line-height:1.6}
*{box-sizing:border-box}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
#app{height:100%;display:flex;flex-direction:column;padding-inline:16px;padding-block:12px;gap:10px;max-width:1440px;margin:0 auto}
.top{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:8px;margin-right:auto}
.brand b{font-size:17px;letter-spacing:.02em}
.brand span{font-family:var(--mono);font-size:11px;color:var(--muted)}
.tabs{display:flex;gap:2px;background:var(--surface2);border:1px solid var(--line);border-radius:8px;padding:3px;overflow-x:auto;max-width:100%}
.tabs button{border:0;background:none;padding:5px 12px;border-radius:6px;white-space:nowrap;color:var(--muted)}
.tabs button[aria-pressed="true"]{background:var(--surface);color:var(--ink);font-weight:500;box-shadow:0 1px 2px rgba(0,0,0,.08)}
.btn{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:5px 12px;white-space:nowrap}
.btn:hover{border-color:var(--muted)}
.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:500}
.btn.ghost{border-color:transparent;background:none;color:var(--muted)}
.btn.danger{color:var(--danger)}
.btn.sm{padding:2px 9px;font-size:12.5px}
.banner{font-size:12.5px;padding:6px 12px;border-radius:6px;background:var(--note);border:1px solid var(--note-line)}
.shell{flex:1;min-height:0;display:grid;grid-template-columns:210px minmax(280px,380px) 1fr;background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.side{background:var(--surface2);border-right:1px solid var(--line);padding:12px 8px;overflow-y:auto;display:flex;flex-direction:column;gap:14px}
.side h4{margin:0 8px 4px;font-size:11px;letter-spacing:.08em;color:var(--muted);font-weight:500}
.nav{display:flex;flex-direction:column;gap:1px}
.nav button{display:flex;align-items:center;gap:8px;border:0;background:none;text-align:left;padding:5px 8px;border-radius:6px;width:100%}
.nav button:hover{background:var(--surface)}
.nav button[aria-pressed="true"]{background:var(--accent-soft);color:var(--accent);font-weight:500}
.nav .n{margin-left:auto;font-family:var(--mono);font-size:11.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.dot{width:8px;height:8px;border-radius:50%;flex:none}
.addr{font-family:var(--mono);font-size:11px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.list{border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.lhead{padding:10px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:8px}
.search{width:100%;border:1px solid var(--line);background:var(--surface2);border-radius:6px;padding:5px 10px}
.chips{display:flex;gap:4px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:none;border-radius:99px;padding:1px 10px;font-size:12px;color:var(--muted)}
.chip[aria-pressed="true"]{border-color:var(--ink);color:var(--ink);font-weight:500}
.rows{overflow-y:auto;flex:1}
.row{display:grid;grid-template-columns:4px 1fr;gap:0 10px;padding:10px 12px 10px 0;border-bottom:1px solid var(--line);cursor:pointer;background:none;border-left:0;border-right:0;border-top:0;width:100%;text-align:left}
.row:hover{background:var(--surface2)}
.row[aria-current="true"]{background:var(--accent-soft)}
.row .stripe{grid-row:1/4;border-radius:0 3px 3px 0}
.row .l1{display:flex;gap:8px;align-items:baseline;min-width:0}
.row .from{font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row .time{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.row .subj{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row .l3{display:flex;gap:6px;align-items:center;flex-wrap:wrap;font-size:11.5px;color:var(--muted)}
.row.unread .subj{font-weight:700}
.pill{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;padding:0 8px;border-radius:99px;border:1px solid currentColor;line-height:18px;white-space:nowrap}
.pill::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.mb{font-size:11px;padding:0 7px;border-radius:4px;background:var(--surface2);border:1px solid var(--line);white-space:nowrap}
.av{width:18px;height:18px;border-radius:50%;vertical-align:middle;object-fit:cover}
.empty{padding:40px 20px;text-align:center;color:var(--muted)}
.detail{overflow-y:auto;min-width:0;display:flex;flex-direction:column}
.dhead{padding:16px 22px 12px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:10px}
.dhead h2{margin:0;font-size:18px;line-height:1.4;text-wrap:balance}
.meta{display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-size:12.5px;color:var(--muted)}
.meta .mono{font-family:var(--mono)}
.ctrls{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.seg button{border:0;border-right:1px solid var(--line);background:var(--surface);padding:3px 11px;font-size:12.5px;color:var(--muted)}
.seg button:last-child{border-right:0}
.seg button[aria-pressed="true"]{color:var(--accent-ink);font-weight:500}
.pick{position:relative}
.pop{position:absolute;z-index:5;top:calc(100% + 4px);left:0;width:260px;max-width:80vw;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:8px;display:flex;flex-direction:column;gap:4px}
.pop button.opt{display:flex;gap:8px;align-items:center;border:0;background:none;padding:5px 6px;border-radius:5px;text-align:left}
.pop button.opt:hover{background:var(--surface2)}
.thread{padding:18px 22px;display:flex;flex-direction:column;gap:12px}
.msg{border:1px solid var(--line);border-radius:8px;padding:12px 14px;max-width:72ch}
.msg.out{align-self:flex-end;background:var(--accent-soft);border-color:transparent}
.msg.auto{align-self:flex-end;background:var(--auto);border-color:var(--auto-line)}
.msg.note{background:var(--note);border-color:var(--note-line)}
.msg.log{border:0;padding:0;font-size:12px;color:var(--muted);align-self:center}
.msg .mh{font-size:12px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.msg .mb2{white-space:pre-wrap;word-break:break-word}
.composer{margin:0 22px 22px;border:1px solid var(--line);border-radius:8px;padding:10px;display:flex;flex-direction:column;gap:8px;background:var(--surface2)}
.composer textarea{width:100%;min-height:130px;resize:vertical;border:1px solid var(--line);border-radius:6px;padding:8px 10px;background:var(--surface);line-height:1.6}
.bar{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.bar .sp{margin-left:auto}
select,.inp{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:4px 8px;max-width:100%}
.inp{width:100%}
textarea.inp{min-height:90px;resize:vertical;line-height:1.6}
.hint{font-size:12px;color:var(--muted)}
code{font-family:var(--mono);font-size:12px;background:var(--surface2);border:1px solid var(--line);border-radius:4px;padding:0 4px}
/* settings pages */
.page{flex:1;min-height:0;overflow-y:auto;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:20px 22px;display:grid;grid-template-columns:minmax(220px,300px) 1fr;gap:24px;align-content:start}
.page.one{grid-template-columns:1fr}
.page h3{margin:0 0 4px;font-size:15px}
.stack{display:flex;flex-direction:column;gap:10px;min-width:0}
.item{border:1px solid var(--line);border-radius:8px;padding:9px 12px;background:none;text-align:left;display:flex;flex-direction:column;gap:2px;width:100%}
.item[aria-current="true"]{border-color:var(--accent);background:var(--accent-soft)}
.item small{color:var(--muted)}
label.f{display:flex;flex-direction:column;gap:4px;font-size:12.5px;color:var(--muted)}
label.f > *{color:var(--ink)}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.switch{display:inline-flex;gap:6px;align-items:center;font-size:13px;color:var(--ink)}
.overlay{position:fixed;inset:0;background:rgba(10,16,24,.45);display:flex;align-items:center;justify-content:center;padding:16px;z-index:10}
.modal{background:var(--surface);border-radius:10px;box-shadow:var(--shadow);padding:18px 20px;width:560px;max-width:100%;max-height:100%;overflow-y:auto;display:flex;flex-direction:column;gap:12px}
.modal h3{margin:0;font-size:16px}
.toast{position:fixed;bottom:calc(18px + env(safe-area-inset-bottom,0px));left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:7px 16px;border-radius:6px;font-size:13px;z-index:20;box-shadow:var(--shadow)}
.back{display:none}
.cstrip{display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:13px;padding:6px 10px;border:1px solid var(--line);border-radius:8px;background:var(--surface2)}
.mono{font-family:var(--mono);font-size:12px}
a.btn{text-decoration:none;color:inherit;display:inline-block}
a.btn.pri{color:var(--accent-ink)}
@media (max-width:980px){.shell{grid-template-columns:minmax(260px,340px) 1fr}.side{display:none}.mobnav{display:flex!important}}
@media (max-width:720px){
  .shell{grid-template-columns:1fr}
  .shell.showdetail .list{display:none}
  .shell:not(.showdetail) .detail{display:none}
  .back{display:inline-block}
  .page{grid-template-columns:1fr}
  .dhead,.thread{padding-inline:14px}.composer{margin-inline:14px}
}
.mobnav{display:none;gap:6px;flex-wrap:wrap}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
/* ---- production additions ---- */
.login{min-height:100%;display:flex;align-items:center;justify-content:center;padding-inline:16px;padding-block:24px}
.login form{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:28px 26px;width:360px;max-width:100%;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow)}
.login h1{margin:0;font-size:20px}
.err{color:var(--danger);font-size:13px}
.files{display:flex;gap:6px;flex-wrap:wrap}
.fchip{display:inline-flex;gap:6px;align-items:center;border:1px solid var(--line);border-radius:6px;padding:2px 8px;font-size:12.5px;background:var(--surface)}
.fchip button{border:0;background:none;color:var(--muted);padding:0}
.atts{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.atts a{font-size:12.5px;border:1px solid var(--line);border-radius:6px;padding:2px 9px;text-decoration:none;color:var(--ink);background:var(--surface)}
.htmlframe{width:100%;height:420px;border:1px solid var(--line);border-radius:6px;background:#fff;margin-top:8px}
.sdot{width:7px;height:7px;border-radius:50%;display:inline-block;flex:none}
.userbox{display:flex;gap:8px;align-items:center;font-size:12.5px;color:var(--muted)}
.subtabs{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:6px}
.fieldset{border:1px solid var(--line);border-radius:8px;padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.fieldset legend{font-size:12.5px;color:var(--muted);padding:0 6px}
.ok{color:var(--st-done)}
.spin{opacity:.6;pointer-events:none}
.suggest{position:absolute;z-index:6;left:0;right:0;top:calc(100% + 2px);background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);max-height:240px;overflow-y:auto}
.suggest button{display:block;width:100%;text-align:left;border:0;background:none;padding:6px 10px;font-size:13px}
.suggest button:hover{background:var(--surface2)}
.rel{position:relative}