:root{
  color-scheme: light dark;
  --bg:#f5f6fa; --panel:#ffffff; --panel-2:#f0f2f7; --fg:#1d2130; --muted:#646b7d; --line:#e2e5ee;
  --accent:#4f46e5; --accent-fg:#ffffff; --accent-soft:#eef0ff; --danger:#d93636; --ok:#18794e; --warn:#a15c07;
  --ok-soft:#e6f6ee; --err-soft:#fdecec; --warn-soft:#fff4e0; --info-soft:#e8f1ff;
  --radius:10px; --shadow:0 1px 2px rgba(16,24,40,.06),0 4px 14px rgba(16,24,40,.06);
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0f1117; --panel:#171a22; --panel-2:#1e2230; --fg:#e7e9f0; --muted:#9aa1b3; --line:#2a2f3d;
    --accent:#818cf8; --accent-fg:#0f1117; --accent-soft:#232647; --danger:#f07070; --ok:#4cc38a; --warn:#f0b35a;
    --ok-soft:#14291f; --err-soft:#2e1717; --warn-soft:#2e2414; --info-soft:#17223a; --shadow:none; }
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--fg);font:15px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
h1{font-size:22px;margin:0 0 12px} h2{font-size:17px;margin:0}
.muted{color:var(--muted)} .small{font-size:13px} .center{text-align:center} .right{text-align:right}
.nowrap{white-space:nowrap} .mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.inline{display:inline} .spacer{flex:1}
.stack>*+*{margin-top:12px}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
/* controls */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);background:var(--panel);
  color:var(--fg);border-radius:8px;padding:8px 14px;font:inherit;font-weight:500;cursor:pointer;line-height:1.2;text-decoration:none}
.btn:hover{background:var(--panel-2);text-decoration:none}
.btn:focus-visible,.input:focus-visible,.select:focus-visible,.textarea:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)} .btn-primary:hover{filter:brightness(1.07);background:var(--accent)}
.btn-danger{color:var(--danger);border-color:color-mix(in srgb,var(--danger) 45%,var(--line))}
.btn-ghost{background:transparent;border-color:transparent} .btn-ghost:hover{background:var(--panel-2)}
.btn-sm{padding:5px 10px;font-size:13px;border-radius:7px} .btn-block{width:100%}
.input,.select,.textarea{width:100%;border:1px solid var(--line);background:var(--panel);color:var(--fg);border-radius:8px;padding:9px 11px;font:inherit}
.input-sm,.select-sm{padding:5px 8px;font-size:13px;width:auto}
.textarea{resize:vertical;min-height:300px;font-family:inherit}
.field{display:block} .field>span{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
.badge{display:inline-block;font-size:12px;padding:2px 8px;border-radius:999px;background:var(--panel-2);color:var(--muted)}
.badge.ok{background:var(--ok-soft);color:var(--ok)} .badge.err{background:var(--err-soft);color:var(--danger)} .badge.info{background:var(--info-soft);color:var(--accent)}
.tag{font-size:12px;background:var(--accent-soft);color:var(--accent);border-radius:6px;padding:2px 7px;margin-left:6px;font-weight:600}
.flashes{margin-bottom:12px}
.flash{padding:10px 14px;border-radius:8px;margin-bottom:8px;background:var(--info-soft)}
.flash-ok{background:var(--ok-soft);color:var(--ok)} .flash-err{background:var(--err-soft);color:var(--danger)} .flash-warn{background:var(--warn-soft);color:var(--warn)}
.notice{background:var(--warn-soft);color:var(--warn);padding:8px 12px;border-radius:8px;margin:8px 0;font-size:14px}
.empty{padding:48px;text-align:center;color:var(--muted)}
/* auth pages */
body.auth{display:grid;place-items:center;padding:16px}
.auth-card{width:100%;max-width:400px;background:var(--panel);border-radius:14px;padding:28px;box-shadow:var(--shadow);border:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;color:var(--fg);margin-bottom:18px}
.logo:hover{text-decoration:none}
.logo-mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--accent);color:var(--accent-fg);font-size:16px}
/* top bar */
.topbar{display:flex;align-items:center;gap:16px;padding:10px 18px;background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.topbar .logo{margin:0;white-space:nowrap}
.search{display:flex;gap:6px;flex:1;max-width:620px}
.search .select{width:auto}
.who{display:flex;align-items:center;gap:8px;margin-left:auto}
.adminnav{display:flex;gap:4px}
.adminnav a{padding:7px 12px;border-radius:8px;color:var(--fg)} .adminnav a.active,.adminnav a:hover{background:var(--accent-soft);color:var(--accent);text-decoration:none}
/* webmail layout */
.shell{display:grid;grid-template-columns:250px 1fr;min-height:calc(100vh - 57px)}
.sidebar{background:var(--panel);border-right:1px solid var(--line);padding:14px;overflow:auto;max-height:calc(100vh - 57px);position:sticky;top:57px}
.compose-btn{margin-bottom:12px}
.folders{list-style:none;margin:0;padding:0}
.folders li a{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 10px;border-radius:8px;color:var(--fg)}
.folders li a:hover{background:var(--panel-2);text-decoration:none}
.folders li.active a{background:var(--accent-soft);color:var(--accent);font-weight:600}
.folders .fname{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.folders .count{font-size:12px;background:var(--accent);color:var(--accent-fg);border-radius:999px;padding:1px 7px;font-weight:600}
.folders .depth-1 a{padding-left:24px} .folders .depth-2 a{padding-left:38px} .folders .depth-3 a,.folders .depth-4 a{padding-left:52px}
.content{padding:16px 20px;min-width:0}
.toolbar{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.toolbar .move{display:inline-flex;gap:6px}
.check{display:inline-flex;padding:0 6px}
.msglist{width:100%;border-collapse:collapse;background:var(--panel);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);table-layout:fixed}
.msglist td{padding:9px 10px;border-bottom:1px solid var(--line);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msglist tr:hover td{background:var(--panel-2)}
.msglist a{color:var(--fg)} .msglist tr.unread a{font-weight:650}
.msglist tr.unread .c-from a::before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--accent);margin-right:7px;vertical-align:middle}
.c-check{width:36px} .c-flag{width:28px} .c-from{width:24%} .c-date{width:92px;text-align:right} .c-size{width:76px;text-align:right}
.star{color:#e0a400}
.message{background:var(--panel);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.subject{font-size:20px;margin-bottom:10px}
.headers{display:grid;grid-template-columns:80px 1fr;gap:3px 12px;margin:0 0 12px;font-size:14px}
.headers dt{color:var(--muted)} .headers dd{margin:0;word-break:break-word}
.attachments{list-style:none;padding:0;margin:0 0 12px;display:flex;flex-wrap:wrap;gap:8px}
.attachments li{background:var(--panel-2);border-radius:8px;padding:6px 10px}
.msgbody{width:100%;border:0;min-height:300px;background:#fff;border-radius:8px}
.compose{background:var(--panel);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.row-field{display:grid;grid-template-columns:80px 1fr;align-items:center;gap:10px}
.row-field label{color:var(--muted);font-size:14px}
/* admin */
.admin-content{max-width:1200px;margin:0 auto;padding:20px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin-bottom:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);margin-bottom:16px}
.card.stat{margin:0} .stat .num{font-size:26px;font-weight:700} .stat .label{color:var(--muted);font-size:13px}
.card-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px;gap:10px;flex-wrap:wrap}
.table{width:100%;border-collapse:collapse}
.table th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-weight:600;padding:8px;border-bottom:1px solid var(--line)}
.table td{padding:9px 8px;border-bottom:1px solid var(--line);vertical-align:top}
.table tr:last-child td{border-bottom:0}
details.create summary,details.manage summary{cursor:pointer;list-style:none}
details.create summary::-webkit-details-marker,details.manage summary::-webkit-details-marker{display:none}
.grid-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px;align-items:end;margin-top:12px}
.addr{display:flex;gap:6px;align-items:center} .addr .select{width:auto}
.manage-panel{position:absolute;right:20px;z-index:3;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px;box-shadow:var(--shadow);min-width:360px;text-align:left}
details.manage{position:relative}
.chip{display:inline-flex;align-items:center;gap:4px;background:var(--panel-2);border-radius:999px;padding:3px 4px 3px 10px;margin:2px 4px 2px 0;font-size:13px}
.chip-x{border:0;background:transparent;color:var(--muted);cursor:pointer;font-size:15px;line-height:1;padding:0 6px;border-radius:999px}
.chip-x:hover{background:var(--err-soft);color:var(--danger)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}
code{background:var(--panel-2);padding:1px 5px;border-radius:5px}
@media (max-width: 820px){
  .shell{grid-template-columns:1fr} .sidebar{position:static;max-height:none;border-right:0;border-bottom:1px solid var(--line)}
  .search{display:none} .c-size,.c-flag{display:none} .c-from{width:34%} .two-col{grid-template-columns:1fr}
  .topbar{flex-wrap:wrap} .manage-panel{position:static;min-width:0}
}