:root{color-scheme:light dark;--bg:#f4f6f8;--card:#fff;--ink:#1d2733;--muted:#64748b;--line:#e2e8f0;--brand:#c0392b;--brand-ink:#fff;--bad:#a3221b;--bad-bg:#fde6e4;--ok:#137a3f;--ok-bg:#e4f5ea}
@media (prefers-color-scheme:dark){:root{--bg:#121619;--card:#1b2127;--ink:#e6e9ee;--muted:#9aa5b1;--line:#2b343d;--bad-bg:#3a1f1d;--ok-bg:#15301f}}
*{box-sizing:border-box}html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;padding-bottom:env(safe-area-inset-bottom)}
.center{min-height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 16px 64px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:30px 26px;width:100%;max-width:400px;box-shadow:0 18px 50px rgba(0,0,0,.08)}
.brand{display:flex;align-items:center;gap:10px;justify-content:center;margin-bottom:22px;font-weight:700;font-size:1.25rem}
.brand img{width:36px;height:36px;border-radius:9px}
label{display:block;font-weight:600;font-size:.86rem;margin:14px 0 6px}
input[type=email],input[type=password],input[type=text]{width:100%;font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px}
input:focus{outline:2px solid var(--brand);outline-offset:1px;border-color:var(--brand)}
.check{display:flex;gap:8px;align-items:center;margin-top:14px;font-size:.92rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;font:inherit;font-weight:700;padding:13px 20px;border-radius:10px;border:1px solid var(--brand);background:var(--brand);color:var(--brand-ink);cursor:pointer;margin-top:18px;line-height:1.3}
.btn.light{background:var(--card);color:var(--ink);border-color:var(--line)}
.btn:disabled{opacity:.6;cursor:default}
.btn.small{width:auto;padding:8px 14px;margin:0;font-size:.9rem}
.msg{border-radius:10px;padding:10px 13px;margin:14px 0 0;font-size:.92rem}
.msg.err{background:var(--bad-bg);color:var(--bad)}.msg.ok{background:var(--ok-bg);color:var(--ok)}
.msg:empty{display:none}
.muted{color:var(--muted);font-size:.9rem}
.or{display:flex;align-items:center;gap:12px;margin:18px 0 0;color:var(--muted);font-size:.85rem}.or:before,.or:after{content:"";flex:1;height:1px;background:var(--line)}
.hidden{display:none!important}
/* app shell */
.top{position:sticky;top:0;display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--line);z-index:2}
.top .brand{margin:0;font-size:1.05rem}.top .spacer{flex:1}
main.page{max-width:720px;margin:0 auto;padding:18px 16px}
section.box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:16px}
section.box h2{margin:0 0 10px;font-size:1.05rem}
ul.plain{list-style:none;margin:0;padding:0}ul.plain li{display:flex;align-items:center;gap:10px;padding:10px 0;border-top:1px solid var(--line)}ul.plain li:first-child{border-top:0}
ul.plain li .grow{flex:1;min-width:0}ul.plain li .sub{font-size:.82rem;color:var(--muted)}
.linkbtn{background:none;border:0;color:var(--brand);font:inherit;font-size:.9rem;cursor:pointer;padding:4px 6px}
.banner{background:#f39c1233;border:1px solid #f39c12;border-radius:12px;padding:12px 14px;margin-bottom:16px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.banner .grow{flex:1;min-width:200px}
/* mail app */
.iconbtn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:10px;border:0;background:none;color:var(--ink);font:inherit;font-size:1.35rem;line-height:1;cursor:pointer;text-decoration:none;flex:none}
.iconbtn:hover{background:var(--bg)}
.iconbtn.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.top .brand .count{font-size:.8rem;font-weight:700;background:var(--brand);color:#fff;border-radius:999px;padding:1px 7px;margin-left:6px}.top .brand .count:empty{display:none}
.toolbar{position:sticky;top:58px;z-index:1;background:var(--card);border-bottom:1px solid var(--line)}
.chips{display:flex;gap:8px;overflow-x:auto;padding:10px 16px 4px;scrollbar-width:none}.chips::-webkit-scrollbar{display:none}
.chips.sub{padding-top:2px}.chips.sub .chip{font-size:.8rem;padding:4px 10px}
.chip{flex:none;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:6px 12px;font:inherit;font-size:.88rem;cursor:pointer;max-width:60vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chip.on{background:var(--ink);color:var(--card);border-color:var(--ink)}
.chip .n{font-size:.75rem;font-weight:700;opacity:.8}
.dot{display:inline-block;width:10px;height:10px;border-radius:50%;flex:none}
.bar{display:flex;align-items:center;gap:14px;padding:6px 16px 10px;font-size:.88rem}
.bar select{font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:8px;padding:5px 8px;max-width:50%}
.bar .toggle{display:flex;align-items:center;gap:6px;margin:0;font-weight:500;font-size:.88rem}.bar .spacer{flex:1}.bar .muted{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search{display:flex;gap:8px;padding:0 16px 10px}.search input{flex:1;font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:10px;padding:9px 12px}
main.mail{max-width:1200px;margin:0 auto}
.listpane{padding-bottom:24px}
.notice{margin:16px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.center-text{text-align:center;padding:24px}
.msgs{list-style:none;margin:0;padding:0}
.msgs li{position:relative;border-bottom:1px solid var(--line);cursor:pointer;overflow:hidden;touch-action:pan-y;user-select:none;-webkit-user-select:none}
.msgs li .row{position:relative;display:flex;gap:10px;padding:11px 16px;background:var(--card);will-change:transform}
.msgs li .under{position:absolute;inset:0;display:flex;align-items:center;justify-content:space-between;padding:0 18px;font-weight:700;color:#fff;font-size:.9rem;visibility:hidden}
.msgs li.swiping .under{visibility:visible}
.msgs li .under span{opacity:.75;transition:opacity .1s,transform .1s}
.msgs li.arm .under span{opacity:1;transform:scale(1.08)}
.msgs li.to-right .under{background:#1f6fb2}.msgs li.to-right .under .del{visibility:hidden}
.msgs li.to-left .under{background:#a3221b}.msgs li.to-left .under .rd{visibility:hidden}
.msgs li.gone{transition:max-height .2s,opacity .2s;max-height:0;opacity:0;border-bottom-width:0}
.msgs li .dot{margin-top:6px}
.msgs li .grow{flex:1;min-width:0}
.msgs li .l1{display:flex;justify-content:space-between;gap:10px;font-size:.95rem}
.msgs li .from{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.msgs li .date{flex:none;color:var(--muted);font-size:.8rem}
.msgs li .l2{font-size:.92rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msgs li .l3{font-size:.84rem;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msgs li.unread .from,.msgs li.unread .l2{font-weight:700}.msgs li.unread .date{color:var(--brand);font-weight:700}
.msgs li .flag{color:#e67e22;margin-right:4px}.msgs li .ans{color:var(--muted);margin-right:4px}.msgs li .att{color:var(--muted)}
.msgs li.sel .row{background:var(--bg)}
.listpane .btn{width:auto;margin:14px auto;display:flex}
.readpane{background:var(--card)}
.readhead{padding:16px 16px 10px;border-bottom:1px solid var(--line)}
.readhead h1{font-size:1.15rem;margin:0 0 12px;line-height:1.3;overflow-wrap:anywhere}
.fromline{display:flex;gap:12px;align-items:center}
.avatar{width:40px;height:40px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-weight:700;flex:none}
.fromline .sub{font-size:.82rem;color:var(--muted)}
.linkbtn.tiny{font-size:.82rem;padding:0}
.details{margin:12px 0 0;display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:.86rem}.details dt{color:var(--muted)}.details dd{margin:0;overflow-wrap:anywhere}.details .dot{margin-right:6px}
.atts{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.attchip{display:inline-flex;gap:6px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:7px 10px;font-size:.86rem;color:var(--ink);text-decoration:none;background:var(--bg);max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.imgbar{display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-top:12px;padding:8px 12px;border-radius:10px;background:var(--bg);font-size:.86rem}
.imgbar .imgbtns{display:flex;gap:14px}
#rFrame{display:block;width:100%;border:0;height:200px;background:#fff}
.textbody{margin:0;padding:14px 16px;white-space:pre-wrap;overflow-wrap:anywhere;font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
body.reading .toolbar{display:none}
body.reading .listpane{display:none}
body.reading .top .brand{display:none}
@media (min-width:900px){
  main.mail{display:grid;grid-template-columns:400px 1fr;height:calc(100vh - 58px - 100px)}
  .toolbar{position:static}
  .listpane{overflow-y:auto;border-right:1px solid var(--line)}
  .readpane{overflow-y:auto;display:block!important}
  body.reading .toolbar,body.reading .listpane,body.reading .top .brand{display:block}body.reading .toolbar{display:block}
  #backBtn{display:none!important}
  .msgs li.sel .row{background:var(--bg);box-shadow:inset 3px 0 0 var(--brand)}
}

/* actions */
.actions{display:flex;justify-content:space-around;gap:4px;padding:6px 8px;border-bottom:1px solid var(--line);background:var(--card)}
.actions button{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;border:0;background:none;color:var(--ink);font:inherit;font-size:1.25rem;line-height:1.1;padding:6px 2px;border-radius:10px;cursor:pointer}
.actions button span{font-size:.7rem;color:var(--muted)}
.actions button:hover{background:var(--bg)}.actions button.on{color:#e67e22}
@media (max-width:899px){
  body.reading .readpane{padding-bottom:70px}
  body.reading .actions{position:fixed;left:0;right:0;bottom:0;z-index:3;border-top:1px solid var(--line);border-bottom:0;padding-bottom:calc(6px + env(safe-area-inset-bottom))}
}
.toast{position:fixed;left:50%;bottom:calc(16px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:5;display:flex;align-items:center;gap:14px;background:var(--ink);color:var(--card);border-radius:12px;padding:12px 16px;font-size:.92rem;box-shadow:0 8px 30px rgba(0,0,0,.25);max-width:calc(100vw - 32px)}
.toast .linkbtn{color:#ffb4a8;font-weight:700;padding:0}
body.reading .toast{bottom:calc(84px + env(safe-area-inset-bottom))}

/* more sheet */
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:6;background:var(--card);border-top:1px solid var(--line);border-radius:16px 16px 0 0;padding:8px 8px calc(10px + env(safe-area-inset-bottom));box-shadow:0 -10px 40px rgba(0,0,0,.25);display:flex;flex-direction:column}
.sheet button{text-align:left;border:0;background:none;color:var(--ink);font:inherit;padding:14px 12px;border-radius:10px;cursor:pointer}
.sheet button:hover{background:var(--bg)}.sheet button.on{color:#e67e22}.sheet button.muted{text-align:center}
@media (min-width:900px){.sheet{left:auto;right:16px;bottom:auto;top:160px;width:280px;border-radius:14px;border:1px solid var(--line)}}
/* compose */
.fab{position:fixed;right:18px;bottom:calc(18px + env(safe-area-inset-bottom));z-index:4;width:56px;height:56px;border-radius:50%;border:0;background:var(--brand);color:#fff;font-size:1.5rem;box-shadow:0 8px 24px rgba(0,0,0,.25);cursor:pointer}
body.reading .fab,body.composing .fab{display:none}
.compose{position:fixed;inset:0;z-index:7;background:var(--bg);overflow-y:auto}
.compose .top{position:sticky;top:0}
.compose .btn.small{margin:0}
.cform{max-width:720px;margin:0 auto;padding:12px 16px 40px}
.cform label{display:block;font-weight:600;font-size:.82rem;color:var(--muted);margin:10px 0 0}
.cform label input,.cform label select{display:block;width:100%;margin-top:4px;font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.cform textarea{display:block;width:100%;margin-top:12px;font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px;min-height:180px;resize:vertical}
.ccrow{text-align:right;margin-top:4px}
.catts{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.catts .attchip{cursor:default}.catts .attchip button{border:0;background:none;color:var(--muted);font:inherit;cursor:pointer;padding:0 0 0 4px}
.catts .attchip.off{opacity:.45;text-decoration:line-through}
.cattrow{display:flex;align-items:center;gap:12px;margin-top:10px}.cattrow .btn{margin:0}
.quote{margin-top:14px;border:1px solid var(--line);border-radius:10px;padding:8px 12px;background:var(--card)}
.quote summary{cursor:pointer;font-size:.86rem;color:var(--muted)}
.quote pre{white-space:pre-wrap;font:inherit;font-size:.86rem;color:var(--muted);margin:8px 0 0;max-height:240px;overflow:auto}
body.composing{overflow:hidden}