:root {
  --bg: #f5f6f8; --card: #fff; --text: #1d2129; --muted: #86909c; --line: #e5e6eb;
  --accent: #2f6bff; --accent-bg: #eaf0ff; --danger: #e5484d; --unread: #fffbe6; --code-bg: #e8f7ee; --code: #1a7f37;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181c; --card: #222429; --text: #e6e8eb; --muted: #8b919a; --line: #33363d;
    --accent: #6f9bff; --accent-bg: #253152; --danger: #ff6b6f; --unread: #2e2b1f; --code-bg: #1d3526; --code: #6fdc8c;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: var(--accent); text-decoration: none; }
main { max-width: 1200px; margin: 0 auto; padding: 16px; }
h1 { font-size: 20px; margin: 8px 0 12px; }
h2 { font-size: 17px; margin: 0 0 10px; }
h3 { font-size: 13px; color: var(--muted); margin: 16px 0 6px; font-weight: 600; }
.muted { color: var(--muted); }
small { font-size: 12px; }
.card { background: var(--card); color: var(--text); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin-bottom: 12px; }
.top { display: flex; justify-content: space-between; align-items: center; padding: 10px 20px; background: var(--card); color: var(--text); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 2; }
.brand { font-weight: 700; color: var(--text); }
nav { display: flex; gap: 16px; align-items: center; }
nav a { color: var(--muted); }
nav a.on { color: var(--accent); font-weight: 600; }
.inline { display: inline; margin: 0; }
button, .btn { font: inherit; border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 7px; padding: 6px 14px; cursor: pointer; display: inline-block; }
button:hover, .btn:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.danger { color: var(--danger); }
button.link { border: 0; background: none; color: var(--muted); padding: 0; }
.small { padding: 3px 10px; font-size: 13px; }
input, select { font: inherit; width: 100%; padding: 7px 10px; border: 1px solid var(--line); border-radius: 7px; background: var(--bg); color: var(--text); }
label { display: block; margin: 10px 0; font-size: 14px; }
label input { margin-top: 4px; }
.notice { background: var(--accent-bg); color: var(--text); padding: 8px 14px; border-radius: 8px; margin-bottom: 12px; }
.error { background: var(--danger); color: #fff; padding: 8px 12px; border-radius: 7px; }
.login { max-width: 360px; margin: 10vh auto; }
.login button { width: 100%; margin-top: 8px; }

.layout { display: grid; grid-template-columns: 320px 1fr; gap: 16px; }
@media (max-width: 800px) { .layout { grid-template-columns: 1fr; } }
aside .box { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 8px; padding: 7px 10px; border-radius: 7px; color: var(--text); }
aside .box:hover { background: var(--card); }
aside .box.on { background: var(--accent-bg); color: var(--text); }
aside .box .addr { flex: 1; word-break: break-all; font-size: 14px; }
aside .box small { width: 100%; }
.badge { background: var(--accent); color: #fff; border-radius: 10px; padding: 0 7px; font-size: 12px; }
.new { margin-top: 14px; }
.new .row { display: flex; gap: 6px; align-items: center; margin: 8px 0; }
.new .row .muted { white-space: nowrap; font-size: 13px; }
.selhead { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.big { font-size: 17px; word-break: break-all; }
.actions { display: flex; gap: 6px; align-items: center; }
.live { font-size: 12px; margin: 0 0 6px; }
.live::first-letter { color: var(--code); }
.msg { display: block; background: var(--card); color: var(--text); border: 1px solid var(--line); border-radius: 9px; padding: 10px 14px; margin-bottom: 8px; }
.msg:hover { border-color: var(--accent); }
.msg.unread { background: var(--unread); }
.msg.unread .subj { font-weight: 700; }
.line1 { display: flex; justify-content: space-between; gap: 10px; font-size: 13px; }
.from { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.time { color: var(--muted); white-space: nowrap; }
.subj { margin: 2px 0; }
.snip { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.to { color: var(--accent); }
.code { display: inline-block; background: var(--code-bg); color: var(--code); font-family: ui-monospace, Menlo, monospace; font-weight: 700; padding: 0 8px; border-radius: 6px; cursor: copy; margin-left: 6px; }
.code.big { font-size: 20px; }
.empty { text-align: center; color: var(--muted); padding: 40px; }

.msgtop { display: flex; justify-content: space-between; align-items: center; }
.subject { font-size: 20px; }
.heads { border-collapse: collapse; font-size: 14px; margin-bottom: 10px; }
.heads th { text-align: left; color: var(--muted); font-weight: 400; padding: 2px 14px 2px 0; vertical-align: top; white-space: nowrap; }
.heads td { word-break: break-all; }
.atts { margin: 8px 0; display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.tabs { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; border-bottom: 1px solid var(--line); margin: 10px 0; padding-bottom: 6px; font-size: 14px; }
.tabs a { color: var(--muted); }
.tabs a.on { color: var(--accent); font-weight: 600; }
.mailframe { width: 100%; height: 72vh; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
pre.text { white-space: pre-wrap; word-break: break-word; font: 14px/1.6 inherit; font-family: inherit; margin: 0; }

.events { width: 100%; border-collapse: collapse; font-size: 14px; }
.events th, .events td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.events td:last-child { word-break: break-all; }
.nowrap { white-space: nowrap; }
.ev-reject td:nth-child(2), .ev-login_fail td:nth-child(2), .ev-login_blocked td:nth-child(2) { color: var(--danger); }
.ev-received td:nth-child(2), .ev-login_ok td:nth-child(2) { color: var(--code); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 800px) { .grid2 { grid-template-columns: 1fr; } }
.qr { width: 200px; height: 200px; background: #fff; padding: 6px; border-radius: 8px; }
code { background: var(--bg); padding: 2px 6px; border-radius: 4px; word-break: break-all; }