@font-face{
  font-family:'Nunito Sans';
  font-style:normal;
  font-weight:400 800;
  font-display:swap;
  src:url('nunito-sans.woff2') format('woff2');
}
:root{
  --accent:#4e8485;
  --sel:#e9f1f1;
  --sel-bar:#4e8485;
  --bg:#ffffff;
  --line:#eef0f4;
  --ink:#2b2f38;
  --ink-soft:#66707e;
  --muted:#9aa3b0;
  --list:#fcfcfe;
  --w-side:260px;
  --w-list:380px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:'Nunito Sans','Segoe UI',system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}

/* ---------- light, subtle scrollbars ---------- */
*{scrollbar-width:thin;scrollbar-color:#e4e8ee transparent}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#e7ebf1;border-radius:10px;border:3px solid #fff;background-clip:padding-box}
::-webkit-scrollbar-thumb:hover{background:#d6dce4;border:3px solid #fff;background-clip:padding-box}

/* ---------- resizable 3-column grid ---------- */
.app{display:grid;grid-template-columns:var(--w-side) 6px var(--w-list) 6px minmax(0,1fr);height:100vh;min-height:640px}
.resizer{cursor:col-resize;position:relative;background:transparent}
.resizer:hover,.resizer.active{background:var(--sel)}
.resizer:after{content:"";position:absolute;left:2px;top:50%;transform:translateY(-50%);width:2px;height:28px;background:#e4e8ee;border-radius:2px}
.resizer:hover:after{background:var(--accent)}

/* ---------- sidebar ---------- */
.sidebar{border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;min-width:0}
.brand{padding:22px 22px 14px}
.brand .beyebrow{font-size:11px;font-weight:800;letter-spacing:.6px;text-transform:uppercase;color:var(--accent);margin-bottom:5px}
.brand .bname{font-weight:800;font-size:19px;color:var(--ink)}
.brand .bsub{font-weight:600;font-size:12.5px;color:var(--ink-soft);margin-top:2px}
.nav{flex:1 1 auto;min-height:0;overflow:auto;padding:6px 12px 16px}
.folders-h{font-size:11px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);font-weight:800;padding:8px 13px}
.nav a.f{display:flex;align-items:center;gap:10px;padding:9px 13px;border-radius:11px;color:var(--ink-soft);font-weight:600;font-size:14px;cursor:pointer}
.nav a.f:hover{background:#f5f7fa}
.nav a.f.active{background:var(--accent);color:#fff;box-shadow:0 8px 18px -8px rgba(78,132,133,.7)}
.nav a.f svg{width:18px;height:18px;stroke:currentColor;stroke-width:1.7;fill:none;opacity:.7;flex:none}
.nav a.f.active svg{opacity:1}
.nav a.f .dot{width:6px;height:6px;border-radius:50%;background:#c9d2df;flex:none;margin:0 6px}
.nav a.f.active .dot{background:#fff}
.nav a.f .nm{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav a.f .ct{margin-left:auto;font-size:11.5px;color:var(--muted);font-weight:700}
.nav a.f.active .ct{color:#fff}
.sidebar .foot{flex:none;border-top:1px solid var(--line);padding:14px 20px;display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700}
.sidebar .foot a{color:var(--accent);font-weight:800;display:inline-flex;align-items:center;gap:8px}
.sidebar .foot svg{width:16px;height:16px;stroke:currentColor;stroke-width:1.8;fill:none}

/* ---------- list ---------- */
.list{border-right:1px solid var(--line);background:var(--list);display:flex;flex-direction:column;min-width:0;min-height:0}
.list .head{display:flex;align-items:center;gap:10px;padding:18px 18px 14px}
.search{flex:1;display:flex;align-items:center;gap:10px;color:var(--muted);min-width:0}
.search svg{width:18px;height:18px;stroke:currentColor;stroke-width:1.8;fill:none;flex:none}
.search input{border:0;background:transparent;font:inherit;font-size:14.5px;color:var(--ink);width:100%;outline:none}
.search input::placeholder{color:var(--muted)}
.folder-dd{position:relative;flex:none}
.folder-btn{display:flex;align-items:center;gap:6px;color:var(--ink-soft);font-weight:700;font-size:13.5px;white-space:nowrap;cursor:pointer;background:none;border:0;font-family:inherit;padding:5px 7px;border-radius:8px;max-width:150px}
.folder-btn span{overflow:hidden;text-overflow:ellipsis}
.folder-btn:hover{background:#eef1f6}
.folder-btn svg{width:14px;height:14px;stroke:currentColor;stroke-width:2;fill:none;flex:none;transition:transform .15s}
.folder-dd.open .folder-btn svg{transform:rotate(180deg)}
.folder-menu{position:absolute;top:100%;right:0;margin-top:6px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 34px -12px rgba(20,30,60,.28);padding:6px;min-width:220px;max-height:64vh;overflow:auto;z-index:30;display:none}
.folder-dd.open .folder-menu{display:block}
.folder-menu a{display:block;padding:8px 12px;border-radius:8px;font-size:13.5px;font-weight:600;color:var(--ink-soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.folder-menu a:hover{background:#f2f5fa}
.folder-menu a.active{color:var(--accent);background:var(--sel)}
.folder-menu a.allf{font-weight:800;color:var(--ink)}
.folder-menu .divider{height:1px;background:var(--line);margin:5px 4px}
.items{overflow:auto;flex:1}
.item{display:flex;gap:13px;padding:15px 18px;border-top:1px solid var(--line);cursor:pointer;position:relative}
.item:hover{background:#f4f6fa}
.item.sel{background:var(--sel)}
.item.sel:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--sel-bar)}
.item.unread .subj{color:var(--ink);font-weight:800}
.avatar{flex:none;width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px}
.c0{background:#e3ecff;color:#2f6feb}.c1{background:#d8eff1;color:#2b8a9e}.c2{background:#e2f5ea;color:#3aa06a}
.c3{background:#ffeede;color:#d98a37}.c4{background:#e6eefc;color:#4a72c4}.c5{background:#e5e9f7;color:#5568c4}
.meta{min-width:0;flex:1}
.meta .top{display:flex;align-items:flex-start;gap:8px}
.meta .from{font-weight:700;font-size:14px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.meta .topright{margin-left:auto;display:flex;flex-direction:column;align-items:flex-end;gap:4px}
.meta .time{font-size:12px;color:var(--muted);white-space:nowrap;font-weight:600}
.att-flag{width:12px;height:12px;stroke:var(--muted);stroke-width:2;fill:none;display:none}
.att-flag.show{display:block}
.meta .subj{font-size:13.5px;color:var(--ink-soft);font-weight:700;margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.meta .prev{font-size:12.5px;color:var(--muted);line-height:1.45;margin-top:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:36px}
.meta .fld{display:inline-block;margin-top:5px;font-size:10.5px;font-weight:800;letter-spacing:.2px;color:var(--accent);background:var(--sel);padding:2px 7px;border-radius:20px}
.empty{padding:44px 20px;text-align:center;color:var(--muted);font-weight:600;font-size:14px}

/* ---------- reader ---------- */
.reader{display:flex;flex-direction:column;min-width:0;min-height:0}
.msg{padding:30px 34px;overflow:auto;flex:1}
.msg .sender{display:flex;align-items:center;gap:14px;margin-bottom:6px}
.msg .sender .sav{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800}
.msg .sender .sname{font-weight:800;font-size:16px}
.msg .sender .saddr{font-size:12.5px;color:var(--muted);font-weight:600}
.msg .when{color:var(--muted);font-size:12.5px;font-weight:700;margin:18px 0 6px}
.msg h1{font-size:22px;font-weight:800;color:var(--ink);margin-bottom:18px;line-height:1.3}
.msg .bodywrap{font-size:14.5px;line-height:1.75;color:var(--ink-soft);max-width:760px;overflow-wrap:break-word}
.msg .bodywrap img{max-width:100%;height:auto}
.msg .bodywrap a{color:var(--accent);font-weight:600}
.msg .bodywrap table{max-width:100%}
.atts{margin-top:24px;display:flex;flex-wrap:wrap;gap:10px}
.att{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:12px;padding:9px 13px;font-size:12.5px;color:var(--ink-soft);font-weight:700}
.att svg{width:15px;height:15px;stroke:currentColor;stroke-width:1.8;fill:none;opacity:.7}
.reader .placeholder{margin:auto;color:var(--muted);font-weight:600;text-align:center;padding:0 30px}

/* ---------- login ---------- */
.login{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f7f8fb}
.login .card{width:360px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px 32px;box-shadow:0 30px 60px -30px rgba(30,40,70,.25)}
.login .beyebrow{font-size:14px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.login .bname{font-weight:800;font-size:22px}
.login .bsub{font-weight:600;font-size:13px;color:var(--ink-soft);margin-top:2px}
.login label{display:block;font-size:12.5px;font-weight:700;color:var(--ink-soft);margin:16px 0 6px}
.login input{width:100%;border:1px solid #dfe3ea;border-radius:11px;padding:12px 14px;font:inherit;font-size:14.5px;outline:none}
.login input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--sel)}
.login button{width:100%;margin-top:22px;background:var(--accent);color:#fff;border:0;border-radius:11px;padding:13px;font:inherit;font-weight:800;font-size:14.5px;cursor:pointer}
.login button:hover{filter:brightness(.96)}
.login .err{background:#fdecec;color:#b3261e;border-radius:10px;padding:10px 12px;font-size:12.5px;font-weight:700;margin-top:16px}
.login .ro{margin-top:18px;text-align:center;font-size:11.5px;color:var(--muted);font-weight:700}

/* ---------- mobile (phones / narrow tablets) ---------- */
.hamburger{display:none}
.back-btn{display:none}
.overlay{display:none}

@media (max-width: 768px){
  .app{display:block;position:relative;height:100vh;overflow:hidden}
  .resizer{display:none}

  .sidebar{
    position:fixed;top:0;left:0;bottom:0;width:84%;max-width:320px;z-index:40;
    background:var(--bg);transform:translateX(-100%);transition:transform .25s ease;
    box-shadow:0 0 40px rgba(20,25,40,.18);
  }
  .app.folders-open .sidebar{transform:translateX(0)}

  .overlay{display:block;position:fixed;inset:0;background:rgba(20,25,35,.35);z-index:35;opacity:0;pointer-events:none;transition:opacity .2s ease}
  .app.folders-open .overlay{opacity:1;pointer-events:auto}

  .list{width:100%;height:100vh}

  .hamburger{display:flex;align-items:center;justify-content:center;flex:none;width:36px;height:36px;border-radius:9px;color:var(--ink-soft);background:none;border:0;cursor:pointer}
  .hamburger svg{width:20px;height:20px;stroke:currentColor;stroke-width:1.8;fill:none}
  .hamburger:active{background:#f2f4f7}

  .reader{display:none;position:fixed;inset:0;z-index:30;background:var(--bg);height:100vh}
  .app.reader-open .reader{display:flex;flex-direction:column}
  .app.reader-open .list{display:none}

  .back-btn{display:flex;align-items:center;gap:8px;flex:none;padding:16px 18px;border-bottom:1px solid var(--line);font-weight:700;font-size:14.5px;color:var(--ink-soft);background:none;border-left:0;border-right:0;border-top:0;width:100%;text-align:left;cursor:pointer}
  .back-btn svg{width:18px;height:18px;stroke:currentColor;stroke-width:2;fill:none;flex:none}

  .msg{padding:20px}
  .msg .bodywrap{max-width:none}
  .folder-menu{position:fixed;left:12px;right:12px;top:64px;max-height:70vh}
}