:root{
  --bg:#f4f6fa; --panel:#fff; --side:#0f172a; --side-2:#1e293b; --side-text:#cbd5e1; --side-muted:#64748b;
  --text:#0f172a; --muted:#64748b; --line:#e5e9f0; --accent:#2563eb; --accent-soft:#e8efff;
  --danger:#dc2626; --radius:10px; --font: system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{font:14px/1.45 var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
.muted{color:var(--muted)} .small{font-size:12.5px}
[hidden]{display:none!important}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 14px;cursor:pointer;white-space:nowrap;transition:background .15s,border-color .15s}
.btn:hover{background:#f8fafc;border-color:#cfd6e2}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.btn.primary:hover{background:#1d4ed8}
.btn.ghost{background:transparent;border-color:transparent}
.btn.ghost:hover{background:rgba(148,163,184,.15)}
.btn.small{padding:5px 10px;font-size:13px}
.btn.danger{color:var(--danger)}
.btn.wide{width:100%;justify-content:center}
.btn:disabled{opacity:.6;cursor:default}
.icon-btn{border:0;background:transparent;width:34px;height:34px;border-radius:8px;cursor:pointer;font-size:18px;display:inline-grid;place-items:center;color:var(--muted)}
.icon-btn:hover{background:#eef2f7;color:var(--text)}
.link{border:0;background:none;color:var(--accent);cursor:pointer;padding:0}

/* ---------- Login ---------- */
.login{min-height:100%;display:grid;place-items:center;padding:16px;background:radial-gradient(1200px 600px at 20% -10%,#dbe6ff,transparent),var(--bg)}
.login-card{background:#fff;width:100%;max-width:360px;padding:32px;border-radius:16px;box-shadow:0 20px 50px rgba(15,23,42,.12);display:flex;flex-direction:column;gap:12px}
.login-card h1{margin:0;font-size:24px}
.login-card p{margin:0 0 6px}
.login-logo{width:48px;height:48px;border-radius:12px;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:24px}
.login-card label{display:flex;flex-direction:column;gap:4px;font-weight:600;font-size:13px}
.login-card input{padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-weight:400}
.login-card input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.alert{background:#fee2e2;color:#991b1b;padding:10px 12px;border-radius:8px;font-size:13px}

/* ---------- Layout ---------- */
.app{display:grid;grid-template-columns:260px minmax(320px,420px) 1fr;height:100vh;height:100dvh}
.sidebar{background:var(--side);color:var(--side-text);display:flex;flex-direction:column;min-height:0}
.sidebar-top{padding:16px;display:flex;flex-direction:column;gap:14px}
.brand{font-weight:700;color:#fff;font-size:16px;letter-spacing:.2px}
.nav{flex:1;overflow:auto;padding:0 8px 16px}
.sidebar-foot{padding:10px 12px;border-top:1px solid var(--side-2)}
.sidebar-foot .btn{color:var(--side-text)}
.nav-item{display:flex;align-items:center;gap:8px;width:100%;border:0;background:none;color:inherit;padding:7px 10px;border-radius:8px;cursor:pointer;text-align:left}
.nav-item:hover{background:var(--side-2)}
.nav-item.active{background:#2a3a57;color:#fff}
.nav-item .label{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-item .count,.acc-head .count{font-size:12px;font-weight:700;background:var(--accent);color:#fff;border-radius:10px;padding:0 7px;min-width:20px;text-align:center}
.nav-item .ico{width:18px;text-align:center;opacity:.8}
.nav-unified{font-weight:600;margin:4px 0 10px}
.acc{margin-top:6px}
.acc-head{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;cursor:pointer;user-select:none}
.acc-head:hover{background:var(--side-2)}
.acc-head .dot{width:10px;height:10px;border-radius:50%;flex:none}
.acc-head .acc-name{flex:1;min-width:0}
.acc-head .acc-name b{display:block;color:#fff;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.acc-head .acc-name span{display:block;font-size:11.5px;color:var(--side-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.acc-head .chev{transition:transform .15s;color:var(--side-muted)}
.acc.open .chev{transform:rotate(90deg)}
.acc-folders{padding-left:14px;display:none}
.acc.open .acc-folders{display:block}
.acc-err{color:#fca5a5;font-size:12px;padding:4px 10px}
.acc-loading{color:var(--side-muted);font-size:12px;padding:4px 10px}

/* ---------- Liste ---------- */
.list-pane{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.pane-head{display:flex;align-items:center;gap:8px;padding:12px 14px;border-bottom:1px solid var(--line);min-height:58px}
.pane-title{flex:1;min-width:0}
.pane-title h2{margin:0;font-size:16px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.search{padding:10px 14px;border-bottom:1px solid var(--line)}
.search input{width:100%;padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:#f8fafc}
.search input:focus{outline:none;border-color:var(--accent);background:#fff}
.msg-list{list-style:none;margin:0;padding:0;overflow:auto;flex:1}
.msg{display:grid;grid-template-columns:4px 1fr auto;gap:0 10px;padding:10px 14px 10px 0;border-bottom:1px solid var(--line);cursor:pointer;position:relative}
.msg:hover{background:#f8fafc}
.msg.active{background:var(--accent-soft)}
.msg .stripe{grid-row:1/4;border-radius:0 3px 3px 0}
.msg .from{font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msg .date{font-size:12px;color:var(--muted);white-space:nowrap}
.msg .subj{grid-column:2/4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#334155}
.msg .meta{grid-column:2/4;display:flex;gap:8px;font-size:11.5px;color:var(--muted)}
.msg.unread .from,.msg.unread .subj{font-weight:700;color:var(--text)}
.msg.unread::after{content:"";position:absolute;left:10px;top:16px;width:7px;height:7px;border-radius:50%;background:var(--accent)}
.msg.unread{padding-left:0}
.msg .from{padding-left:12px}.msg .subj,.msg .meta{padding-left:12px}
.acc-tag{display:inline-flex;align-items:center;gap:4px}
.acc-tag i{width:7px;height:7px;border-radius:50%;display:inline-block}
.list-foot{padding:10px;text-align:center}
.list-info{padding:30px 16px;text-align:center;color:var(--muted)}
.list-err{margin:8px 14px 0;background:#fff7ed;color:#9a3412;border:1px solid #fed7aa;padding:8px 10px;border-radius:8px;font-size:12.5px}

/* ---------- Lesen ---------- */
.read-pane{display:flex;flex-direction:column;min-height:0;min-width:0;background:var(--panel)}
.read-pane article{display:flex;flex-direction:column;min-height:0;flex:1}
.empty{flex:1;display:grid;place-content:center;text-align:center;color:#94a3b8}
.empty div{font-size:48px;opacity:.5}
.reader-tools .tools{display:flex;gap:6px;flex:1;overflow-x:auto;scrollbar-width:thin}
.reader-tools .tools > *{flex:none}
.reader-head{padding:16px 22px 8px}
.reader-head h1{font-size:20px;margin:0 0 14px;line-height:1.3;word-break:break-word}
.r-meta{display:flex;gap:12px;align-items:flex-start}
.avatar{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:700;flex:none}
.r-meta-text{flex:1;min-width:0}
.r-from{font-weight:600;word-break:break-word}
.r-from span{font-weight:400;color:var(--muted)}
.r-account{margin-top:8px;color:var(--muted)}
.attachments{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.att{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:8px;padding:6px 10px;text-decoration:none;color:var(--text);max-width:280px;background:#fff}
.att:hover{border-color:var(--accent)}
.att .n{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att .s{color:var(--muted);font-size:12px;white-space:nowrap}
.att button{border:0;background:none;cursor:pointer;color:var(--muted);padding:0 2px}
.remote-banner{margin-top:12px;background:#f8fafc;border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:13px;color:var(--muted);display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.r-body{flex:1;border:0;width:100%;min-height:200px;background:#fff;border-top:1px solid var(--line)}

/* ---------- Verfassen ---------- */
.modal{position:fixed;inset:0;background:rgba(15,23,42,.45);display:grid;place-items:center;z-index:50;padding:16px}
.compose{background:#fff;border-radius:14px;width:min(820px,100%);height:min(760px,100%);display:flex;flex-direction:column;box-shadow:0 30px 80px rgba(0,0,0,.3);overflow:hidden}
.compose-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line)}
.compose-fields{padding:4px 16px;display:flex;flex-direction:column}
.compose-fields label{display:flex;align-items:center;border-bottom:1px solid var(--line);gap:10px}
.compose-fields label span{width:60px;color:var(--muted);font-size:13px}
.compose-fields input,.compose-fields select{flex:1;border:0;padding:10px 0;outline:none;background:transparent;min-width:0}
.compose-fields .link{align-self:flex-end;margin:4px 0}
.compose textarea{flex:1;border:0;padding:14px 16px;resize:none;outline:none;font:14px/1.55 var(--font)}
.compose-att{padding:0 16px;margin:0}
.compose-foot{display:flex;align-items:center;gap:10px;padding:12px 16px;border-top:1px solid var(--line)}
.file-btn{cursor:pointer}

.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#0f172a;color:#fff;padding:10px 16px;border-radius:10px;z-index:60;box-shadow:0 10px 30px rgba(0,0,0,.25);max-width:90vw}
.toast.error{background:#b91c1c}
.mobile-only{display:none}
.spinner{display:inline-block;width:14px;height:14px;border:2px solid #cbd5e1;border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;vertical-align:-2px}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- Mittlere Breite ---------- */
@media (max-width:1150px){
  .app{grid-template-columns:230px 340px 1fr}
  .reader-tools .tools .btn{padding:5px 8px}
}
/* ---------- Mobil ---------- */
@media (max-width:820px){
  .app{grid-template-columns:1fr;position:relative}
  .mobile-only{display:inline-grid}
  .sidebar{position:fixed;inset:0 auto 0 0;width:min(300px,85vw);z-index:40;transform:translateX(-100%);transition:transform .2s}
  body.show-side .sidebar{transform:none;box-shadow:0 0 0 100vmax rgba(15,23,42,.45)}
  .read-pane{position:fixed;inset:0;z-index:30;transform:translateX(100%);transition:transform .2s}
  body.show-read .read-pane{transform:none}
  .reader-head{padding:14px 16px 6px}
  .compose{height:100%;border-radius:0}
  .modal{padding:0}
}