:root {
  --bg: #f3f5f7;
  --sidebar: #1e222d;
  --sidebar-hover: #2a3040;
  --accent: #20a53a;
  --accent-hover: #189030;
  --text: #333;
  --muted: #6b7280;
  --border: #e5e7eb;
  --card: #fff;
  --danger: #dc2626;
  --ok: #16a34a;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; }

.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 200px; background: var(--sidebar); color: #c9d1d9; flex-shrink: 0;
}
.sidebar .brand { padding: 16px; font-weight: 700; border-bottom: 1px solid #333; color: #fff; }
.sidebar nav a {
  display: block; padding: 10px 16px; color: #c9d1d9; text-decoration: none; font-size: 13px;
}
.sidebar nav a:hover { background: var(--sidebar-hover); color: #fff; }
.sidebar nav a.active { background: var(--accent); color: #fff; }
.main { flex: 1; padding: 20px 24px; overflow: auto; }
.main h1 { margin: 0 0 16px; font-size: 20px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 6px; padding: 16px; margin-bottom: 16px;
}
table.data { width: 100%; border-collapse: collapse; }
table.data th, table.data td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
table.data th { background: #f9fafb; font-weight: 600; }
.badge-ok { color: var(--ok); font-weight: 600; }
.badge-bad { color: var(--danger); }
.btn {
  display: inline-block; padding: 6px 14px; border-radius: 4px; border: none; cursor: pointer; text-decoration: none;
  font-size: 13px;
}
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-hover); }
.btn.ghost { background: #eee; color: #333; }
.btn.danger { background: var(--danger); color: #fff; }
.btn.sm { padding: 4px 10px; font-size: 12px; }
input[type=text], input[type=password], input[type=email], textarea, select {
  width: 100%; max-width: 480px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 4px;
}
label { display: block; margin: 8px 0 4px; color: var(--muted); }
.form-row { margin-bottom: 12px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 8px; }
.err { color: var(--danger); }
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: #e8ecf0; }
.login-card {
  background: #fff; padding: 28px 32px; border-radius: 8px; box-shadow: 0 4px 24px rgba(0,0,0,.08); width: 100%; max-width: 380px;
}
.login-card h1 { font-size: 18px; margin: 0 0 20px; }
.switch { display: inline-flex; align-items: center; gap: 8px; }
.notes { background: #fff8f0; border: 1px solid #f5d5b8; padding: 12px; border-radius: 6px; color: #8b4513; font-size: 13px; }
.notes ul { margin: 8px 0 0; padding-left: 18px; }
.notes code { background: rgba(0,0,0,.06); padding: 1px 4px; border-radius: 3px; font-size: 12px; }
.pager { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.mail-meta th { width: 100px; vertical-align: top; color: var(--muted); font-weight: 600; }
.mail-body { margin: 0; white-space: pre-wrap; word-break: break-word; font-size: 13px; line-height: 1.5; max-height: 70vh; overflow: auto; }
.mail-html { white-space: normal; }
.mail-read-card { max-width: 960px; }