:root {
  --bg: #f4f5f7; --panel: #fff; --text: #1d2330; --muted: #667085; --line: #e3e6eb;
  --accent: #1f4e79; --accent-soft: #e6eef6; --err: #b42318; --ok: #067647;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14171c; --panel: #1c2027; --text: #e6e8eb; --muted: #98a1ad; --line: #2c323b;
          --accent: #7fb0e0; --accent-soft: #223246; --err: #f97066; --ok: #47cd89; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; border-radius: 8px; padding: 9px 14px; background: var(--accent); color: #fff; }
button.sec { background: var(--accent-soft); color: var(--accent); }
button.link { background: none; color: var(--muted); font-size: 20px; padding: 4px 8px; }
input, select { font: inherit; width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); color: var(--text); }

.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 10px; padding: 8px 12px; background: var(--panel); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; color: var(--text); white-space: nowrap; }
.search { flex: 1; }
.menu-btn { display: none; background: none; color: var(--text); font-size: 20px; padding: 4px 8px; }

.layout { display: flex; min-height: calc(100vh - 53px); }
.side { width: 250px; flex-shrink: 0; padding: 10px 8px; border-right: 1px solid var(--line); background: var(--panel); }
.side a { display: flex; gap: 6px; padding: 7px 10px; border-radius: 8px; color: var(--text); }
.side a span { margin-left: auto; color: var(--muted); font-size: 13px; }
.side a.act, .side a:hover { background: var(--accent-soft); }
.side hr { border: 0; border-top: 1px solid var(--line); margin: 8px 4px; }
.side-h { padding: 4px 10px; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.main { flex: 1; min-width: 0; }

.list-head { display: flex; justify-content: space-between; padding: 10px 16px; color: var(--muted); font-size: 13px; }
.pager a { padding: 0 8px; font-size: 16px; }
.mails { list-style: none; margin: 0; padding: 0; }
.mails li a { display: block; padding: 10px 16px; border-bottom: 1px solid var(--line); color: var(--text); background: var(--panel); }
.mails li a:hover { background: var(--accent-soft); }
.mails .r1 { display: flex; justify-content: space-between; gap: 10px; }
.mails .from { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mails .date { color: var(--muted); font-size: 13px; white-space: nowrap; }
.mails .subj, .mails .snip { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mails .snip { color: var(--muted); font-size: 13px; }
.mails li.unread .from, .mails li.unread .subj { font-weight: 700; }
.tags { margin-top: 4px; }
.tag { display: inline-block; font-size: 11px; padding: 1px 7px; margin-right: 4px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); }
.empty { padding: 30px 16px; color: var(--muted); }

.read { padding: 14px 16px; max-width: 980px; }
.read h1 { font-size: 20px; margin: 8px 0; }
.meta { display: grid; grid-template-columns: max-content 1fr; gap: 2px 12px; font-size: 13px; color: var(--muted); margin: 0 0 10px; }
.meta dd { margin: 0; color: var(--text); word-break: break-word; }
.att { list-style: none; padding: 0; margin: 0 0 8px; font-size: 13px; }
.imgnote { font-size: 13px; color: var(--muted); margin: 6px 0; }
iframe.body { width: 100%; height: 75vh; border: 1px solid var(--line); border-radius: 8px; background: #fff; }

.page, .auth { padding: 16px; max-width: 640px; }
.auth { margin: 6vh auto; background: var(--panel); border-radius: 12px; border: 1px solid var(--line); }
.form label { display: block; margin: 10px 0; font-size: 13px; color: var(--muted); }
.form label input, .form label select { margin-top: 4px; }
.form button { margin-top: 8px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin: 10px 0; }
.card small { color: var(--muted); }
.row { display: flex; gap: 8px; margin-top: 8px; }
.msg { padding: 8px 10px; border-radius: 8px; font-size: 14px; }
.msg.err { color: var(--err); background: color-mix(in srgb, var(--err) 10%, transparent); }
.msg.ok { color: var(--ok); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.hint { font-size: 13px; color: var(--muted); }
.qr { display: block; width: 200px; height: 200px; margin: 10px auto; background: #fff; padding: 8px; border-radius: 8px; }
details { margin: 8px 0; font-size: 13px; color: var(--muted); }

@media (max-width: 760px) {
  .menu-btn { display: block; }
  .brand { display: none; }
  .side { position: fixed; top: 53px; left: 0; bottom: 0; z-index: 9; transform: translateX(-100%); transition: transform .2s; overflow-y: auto; box-shadow: 2px 0 12px rgba(0,0,0,.15); }
  .side.open { transform: none; }
  iframe.body { height: 70vh; }
}