:root {
  --bg: #f6f7f9; --panel: #ffffff; --line: #e4e7ec; --text: #1f2328; --muted: #667085;
  --accent: #2f6fed; --accent-weak: #e8f0ff; --danger: #d92d20; --ok: #12b76a; --warn: #f79009;
  --radius: 10px; --shadow: 0 1px 2px rgba(16,24,40,.06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115; --panel: #171a21; --line: #2a2f3a; --text: #e6e8ec; --muted: #98a2b3;
    --accent: #5b8cff; --accent-weak: #1d2a47; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--text); font: 14px/1.5 system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: var(--accent); text-decoration: none; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: 1px solid var(--line); background: var(--panel); border-radius: 8px; padding: 6px 12px; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { color: var(--danger); }
button:disabled { opacity: .5; cursor: default; }
input[type=text], input[type=search], input[type=password], input[type=email], select {
  border: 1px solid var(--line); background: var(--panel); border-radius: 8px; padding: 7px 10px; width: 100%;
}
.muted { color: var(--muted); }
.tag { display: inline-block; font-size: 12px; padding: 0 6px; border-radius: 4px; background: var(--accent-weak); color: var(--accent); line-height: 18px; white-space: nowrap; }
.tag.gray { background: var(--line); color: var(--muted); }
.tag.red { background: #fde8e7; color: var(--danger); }
.tag.green { background: #e3f8ee; color: #067647; }

/* 顶栏 */
.top { height: 52px; display: flex; align-items: center; gap: 12px; padding: 0 16px; background: var(--panel); border-bottom: 1px solid var(--line); }
.top .brand { font-weight: 600; white-space: nowrap; }
.top .search { flex: 1; max-width: 640px; }
.top .me { margin-left: auto; display: flex; gap: 10px; align-items: center; white-space: nowrap; }

/* 三栏 */
.app { display: grid; grid-template-columns: 220px 380px 1fr; height: calc(100vh - 52px); }
.side, .list, .reader { overflow: auto; min-width: 0; }
.side { border-right: 1px solid var(--line); padding: 10px 8px; background: var(--panel); }
.side .item { display: flex; align-items: center; gap: 6px; padding: 7px 10px; border-radius: 8px; cursor: pointer; }
.side .item:hover { background: var(--bg); }
.side .item.on { background: var(--accent-weak); color: var(--accent); }
.side .item .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side h4 { margin: 14px 10px 6px; font-size: 12px; color: var(--muted); font-weight: 500; }
.seg { display: flex; gap: 4px; margin: 0 6px 8px; }
.seg button { flex: 1; padding: 4px 0; font-size: 13px; }
.seg button.on { background: var(--accent-weak); border-color: var(--accent); color: var(--accent); }

.list { border-right: 1px solid var(--line); }
.row { padding: 10px 14px; border-bottom: 1px solid var(--line); cursor: pointer; }
.row:hover { background: var(--panel); }
.row.on { background: var(--accent-weak); }
.row .l1 { display: flex; gap: 8px; align-items: baseline; }
.row .from { font-weight: 600; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .date { font-size: 12px; color: var(--muted); white-space: nowrap; }
.row .subj { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .snip { font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .meta { display: flex; gap: 6px; margin-top: 2px; }
.more { text-align: center; padding: 14px; }
.empty { padding: 40px 20px; text-align: center; color: var(--muted); }

.reader { background: var(--panel); display: flex; flex-direction: column; }
.reader .head { padding: 16px 20px; border-bottom: 1px solid var(--line); }
.reader h2 { margin: 0 0 8px; font-size: 18px; word-break: break-word; }
.reader .kv { font-size: 13px; color: var(--muted); word-break: break-all; }
.reader .kv b { color: var(--text); font-weight: 500; }
.reader .atts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.reader .atts a { border: 1px solid var(--line); border-radius: 8px; padding: 4px 10px; font-size: 13px; }
.reader .body { flex: 1; min-height: 300px; }
.reader iframe { width: 100%; min-height: 300px; border: 0; background: #fff; display: block; }
.reader pre { white-space: pre-wrap; word-break: break-word; margin: 0; padding: 16px 20px; font: inherit; }
.imgbar { padding: 6px 20px; font-size: 13px; background: #fffaeb; color: #93370d; border-bottom: 1px solid var(--line); }
.back { display: none; }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .side { display: none; }
  .app.show-side .side { display: block; }
  .app.show-side .list, .app.show-side .reader { display: none; }
  .reader { display: none; }
  .app.reading .list { display: none; }
  .app.reading .reader { display: flex; }
  .back { display: inline-block; margin-bottom: 8px; }
  .top { padding: 0 12px; gap: 8px; }
  .top .brand span, #meName, .top .me .long { display: none; }
  .top .me { gap: 8px; font-size: 13px; }
}

/* 后台 */
.page { max-width: 1100px; margin: 0 auto; padding: 16px; }
.tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tabs button.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px 16px; margin-bottom: 12px; }
.card h3 { margin: 0 0 6px; font-size: 15px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 700px) { .grid2 { grid-template-columns: 1fr; } }
label.f { display: block; font-size: 13px; color: var(--muted); }
label.f > input, label.f > select { margin-top: 4px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.people { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chk { display: inline-flex; align-items: center; gap: 4px; border: 1px solid var(--line); border-radius: 16px; padding: 3px 10px; cursor: pointer; user-select: none; }
.chk.on { border-color: var(--accent); background: var(--accent-weak); color: var(--accent); }
.chk input { display: none; }
table.t { width: 100%; border-collapse: collapse; font-size: 13px; }
table.t th, table.t td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tablewrap { overflow-x: auto; }
.err { color: var(--danger); font-size: 13px; word-break: break-all; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: #111; color: #fff; padding: 8px 16px; border-radius: 8px; z-index: 99; max-width: 90vw; }

/* 登录 */
.login { max-width: 360px; margin: 12vh auto; padding: 0 16px; text-align: center; }
.login .btn { display: block; width: 100%; padding: 11px; margin: 10px 0; border-radius: 10px; font-size: 15px; }