:root {
  --bg: #f6f7f9; --panel: #ffffff; --ink: #1d1c1d; --muted: #616061; --line: #e2e4e8;
  --accent: #1264a3; --accent-ink: #ffffff; --side: #2b2233; --side-ink: #e7e3ec; --side-muted: #a99fb3;
  --hl: #fff7d6; --subject: #f1f7fc; --mark: #ffe58a;
  font-size: 15px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.45; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; }
code { background: #f0f0f2; border: 1px solid var(--line); border-radius: 3px; padding: 0 4px; }
pre { background: #f0f0f2; border: 1px solid var(--line); border-radius: 4px; padding: 8px 10px; white-space: pre-wrap; word-break: break-word; margin: 4px 0; }
blockquote { border-left: 4px solid #cfd2d8; margin: 4px 0; padding: 0 10px; color: #3a3a3a; }
mark { background: var(--mark); padding: 0 1px; border-radius: 2px; }
small { color: var(--muted); font-weight: normal; }

.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 18px; height: 52px; padding: 0 18px; background: var(--side); color: var(--side-ink); }
.top .brand { color: #fff; font-weight: 700; white-space: nowrap; }
.top .brand .sub { font-weight: 400; color: var(--side-muted); margin-left: 8px; }
.topsearch { flex: 1; max-width: 560px; }
.topsearch input { width: 100%; padding: 7px 12px; border-radius: 6px; border: 1px solid #4b4056; background: #3a3044; color: #fff; }
.topsearch input::placeholder { color: var(--side-muted); }
.top nav { margin-left: auto; display: flex; gap: 16px; }
.top nav a { color: var(--side-ink); }
.top nav a.active { text-decoration: underline; }

.layout { display: flex; min-height: calc(100vh - 52px); }
.sidebar { width: 290px; flex: 0 0 290px; background: var(--side); color: var(--side-ink); position: sticky; top: 52px; height: calc(100vh - 52px); overflow-y: auto; padding: 12px 8px 24px; }
.side-filter { width: 100%; padding: 6px 10px; border-radius: 6px; border: 1px solid #4b4056; background: #3a3044; color: #fff; margin-bottom: 10px; }
.sidebar h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--side-muted); margin: 14px 10px 6px; display: flex; justify-content: space-between; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a { display: flex; justify-content: space-between; gap: 8px; padding: 5px 10px; border-radius: 6px; color: var(--side-ink); }
.sidebar li a:hover { background: #3a3044; text-decoration: none; }
.sidebar li.active a { background: var(--accent); color: #fff; }
.sidebar .cname { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sidebar .count { color: var(--side-muted); font-size: 12px; flex: 0 0 auto; }
.sidebar li.active .count { color: #dbe9f5; }
.sidebar li.hidden { display: none; }

.content { flex: 1; min-width: 0; padding: 20px 28px 60px; max-width: 1100px; }
.conv-head { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; border-bottom: 1px solid var(--line); padding-bottom: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.conv-head h1 { font-size: 22px; margin: 0 0 4px; }
.meta { color: var(--muted); font-size: 13px; margin: 0; }
.controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.toggle, .btn { display: inline-block; padding: 6px 12px; border-radius: 6px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); font-size: 13px; cursor: pointer; }
.toggle:hover, .btn:hover { text-decoration: none; border-color: #b9bec7; }
.toggle.on { background: #e9f1f8; border-color: #b7d0e6; color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.pager { display: flex; gap: 14px; align-items: center; font-size: 13px; color: var(--muted); margin: 10px 0; flex-wrap: wrap; }
.pager a.disabled { pointer-events: none; opacity: .4; }
.pager .jump input { width: 70px; padding: 3px 6px; }
.empty { color: var(--muted); padding: 30px 0; }

.messages { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 6px 0; }
.day-sep { display: flex; align-items: center; margin: 14px 0 6px; color: var(--muted); font-size: 12px; }
.day-sep::before, .day-sep::after { content: ""; flex: 1; border-top: 1px solid var(--line); }
.day-sep span { padding: 0 12px; font-weight: 600; }
.msg { display: flex; gap: 10px; padding: 6px 16px; }
.msg:hover { background: #fafafa; }
.msg.subject { background: var(--subject); }
.msg.hl { background: var(--hl); outline: 2px solid #f1d26b; }
.msg.bot { opacity: .8; }
.avatar { flex: 0 0 36px; width: 36px; height: 36px; border-radius: 6px; display: grid; place-items: center; font-size: 13px; font-weight: 700; color: #fff; background: hsl(var(--hue) 45% 45%); }
.body { min-width: 0; flex: 1; }
.line { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; font-size: 13px; }
.line .name { font-weight: 700; color: var(--ink); font-size: 14px; }
.line .time { color: var(--muted); }
.tag { font-size: 11px; color: var(--muted); background: #eef0f3; border-radius: 4px; padding: 0 6px; }
.tag.link { color: var(--accent); }
.copylink { margin-left: auto; font-size: 11px; color: var(--muted); background: none; border: 1px solid transparent; border-radius: 4px; padding: 0 6px; cursor: pointer; visibility: hidden; }
.msg:hover .copylink { visibility: visible; }
.copylink:hover { border-color: var(--line); }
.text { white-space: normal; word-wrap: break-word; overflow-wrap: anywhere; }
.mention { color: var(--accent); background: #e8f0f8; border-radius: 3px; padding: 0 3px; }
.channel-ref { color: var(--accent); }
.files { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.files .img img { max-width: 360px; max-height: 300px; border-radius: 6px; border: 1px solid var(--line); display: block; }
.files video { max-width: 420px; border-radius: 6px; border: 1px solid var(--line); }
.files .file { display: inline-block; padding: 6px 10px; border: 1px solid var(--line); border-radius: 6px; background: #fafafa; }
.files .file.missing { color: var(--muted); }
.reactions { display: flex; gap: 6px; margin-top: 4px; flex-wrap: wrap; }
.rx { font-size: 12px; background: #eef0f3; border-radius: 12px; padding: 1px 8px; color: var(--muted); }
details.thread { margin: 0 16px 6px 62px; border-left: 2px solid #d5dbe3; padding-left: 4px; }
details.thread summary { cursor: pointer; color: var(--accent); font-size: 13px; padding: 2px 8px; }
details.thread .msg { padding-left: 8px; }

.searchform { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; align-items: end; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 14px; margin-bottom: 14px; }
.searchform label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.searchform label.wide { grid-column: span 4; }
.searchform label.check { flex-direction: row; align-items: center; grid-column: span 2; }
.searchform input, .searchform select { padding: 7px 9px; border: 1px solid var(--line); border-radius: 6px; font: inherit; color: var(--ink); background: #fff; }
.searchform .btn { justify-self: start; }
.results { display: flex; flex-direction: column; gap: 8px; }
.result { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; }
.result.subject { background: var(--subject); }
.result .line .in { color: var(--muted); }
.error { color: #b3261e; background: #fdeceb; border: 1px solid #f3c1bd; border-radius: 6px; padding: 8px 12px; }

.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 10px 0 24px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 14px; }
.stat b { display: block; font-size: 22px; }
.stat span { color: var(--muted); font-size: 13px; }
h2 { font-size: 16px; margin: 22px 0 8px; }
.table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.table th, .table td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); font-size: 14px; }
.table th { background: #fafafa; color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.table .num { text-align: right; }
.table tr.subject td { background: var(--subject); }
.notes { color: #333; }

.login-page { display: grid; place-items: center; min-height: 100vh; background: var(--side); }
.login { background: var(--panel); border-radius: 10px; padding: 28px 30px; width: min(420px, 92vw); display: flex; flex-direction: column; gap: 12px; }
.login h1 { margin: 0; font-size: 20px; }
.login p { margin: 0; color: var(--muted); font-size: 14px; }
.login label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.login input { padding: 9px 10px; border: 1px solid var(--line); border-radius: 6px; font: inherit; }

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar { position: static; width: auto; height: auto; max-height: 40vh; }
  .content { padding: 14px; }
  .searchform { grid-template-columns: 1fr 1fr; }
  .searchform label.wide { grid-column: span 2; }
  .stats { grid-template-columns: 1fr 1fr; }
  .topsearch { display: none; }
}