:root {
  --blue: #1b5fd9;
  --blue-dark: #1246a8;
  --blue-soft: #eaf1ff;
  --red: #d93b3b;
  --red-soft: #fdecec;
  --ink: #1c2536;
  --muted: #6b7688;
  --line: #e3e8f0;
  --bg: #f6f8fc;
  --white: #fff;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Segoe UI", "Microsoft YaHei", -apple-system, Arial, sans-serif;
  font-size: 14px; line-height: 1.55;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 24px 0 12px; }
h3 { font-size: 15px; margin: 18px 0 10px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.red { color: var(--red); }
.nowrap { white-space: nowrap; }

/* layout */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 218px; flex: 0 0 218px; background: var(--white);
  border-right: 1px solid var(--line); padding: 20px 12px;
}
.brand { font-size: 16px; font-weight: 700; color: var(--blue); padding: 0 10px 18px; letter-spacing: .5px; }
.brand span { display: block; font-size: 11px; font-weight: 400; color: var(--muted); letter-spacing: 0; margin-top: 2px; }
.nav-group { font-size: 11px; color: var(--muted); padding: 14px 10px 6px; letter-spacing: 1px; }
.nav a {
  display: block; padding: 9px 12px; border-radius: 6px; color: var(--ink);
  margin-bottom: 2px; font-size: 13px;
}
.nav a:hover { background: var(--blue-soft); text-decoration: none; }
.nav a.active { background: var(--blue); color: #fff; font-weight: 600; }
.main { flex: 1; min-width: 0; padding: 0 28px 48px; }
.topbar {
  height: 60px; display: flex; align-items: center; justify-content: flex-end;
  gap: 14px; border-bottom: 1px solid var(--line); margin-bottom: 24px;
  background: var(--white); margin-left: -28px; margin-right: -28px; padding: 0 28px;
}
.topbar .who { color: var(--muted); font-size: 13px; }
.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.page-head p { margin: 0; color: var(--muted); font-size: 13px; }

/* components */
.card { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 20px; margin-bottom: 18px; }
.card.tight { padding: 14px 18px; }
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stat { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 16px 18px; }
.stat .num { font-size: 26px; font-weight: 700; color: var(--blue); line-height: 1.2; }
.stat .label { color: var(--muted); font-size: 12px; margin-top: 4px; }
.stat.alert .num { color: var(--red); }

table { width: 100%; border-collapse: collapse; background: var(--white); }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--line); font-size: 13px; vertical-align: middle; }
th { background: #f9fbff; color: var(--muted); font-weight: 600; font-size: 12px; letter-spacing: .3px; white-space: nowrap; }
tr:hover td { background: #fcfdff; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; }
.table-wrap table { border-radius: 8px; }
.empty { padding: 36px; text-align: center; color: var(--muted); background: var(--white); border: 1px solid var(--line); border-radius: 8px; }

.btn {
  display: inline-block; border: 1px solid var(--blue); background: var(--blue); color: #fff;
  padding: 8px 16px; border-radius: 6px; font-size: 13px; cursor: pointer; line-height: 1.4;
  font-family: inherit;
}
.btn:hover { background: var(--blue-dark); border-color: var(--blue-dark); text-decoration: none; color: #fff; }
.btn.ghost { background: #fff; color: var(--blue); }
.btn.ghost:hover { background: var(--blue-soft); color: var(--blue-dark); }
.btn.danger { background: #fff; border-color: var(--red); color: var(--red); }
.btn.danger:hover { background: var(--red-soft); color: var(--red); }
.btn.sm { padding: 4px 10px; font-size: 12px; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
a.btn { text-decoration: none; }

label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 5px; font-weight: 600; }
input, select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px;
  font-family: inherit; font-size: 13px; color: var(--ink); background: #fff;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--blue-soft); border-color: var(--blue); }
textarea { min-height: 84px; resize: vertical; }
input[type=checkbox] { width: auto; margin-right: 5px; }
.form-row { margin-bottom: 14px; }
.form-actions { margin-top: 20px; display: flex; gap: 10px; }
.req::after { content: " *"; color: var(--red); }
.inline-form { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.inline-form > div { min-width: 150px; flex: 1; }
.inline-form .btn { flex: 0 0 auto; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11px; font-weight: 600; background: var(--blue-soft); color: var(--blue-dark); white-space: nowrap; }
.badge.warn { background: var(--red-soft); color: var(--red); }
.badge.gray { background: #eef1f5; color: var(--muted); }
.badge.green { background: #e7f6ee; color: #1a7f4b; }
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 13px; }
.flash.ok { background: #e7f6ee; color: #1a7f4b; }
.flash.err { background: var(--red-soft); color: var(--red); }
.flash.info { background: var(--blue-soft); color: var(--blue-dark); }

.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.tabs a { padding: 6px 13px; border: 1px solid var(--line); border-radius: 999px; background: #fff; font-size: 12px; color: var(--muted); }
.tabs a.active { background: var(--blue); border-color: var(--blue); color: #fff; }
.tabs a:hover { text-decoration: none; }

.timeline { border-left: 2px solid var(--line); margin-left: 8px; padding-left: 18px; }
.timeline .item { position: relative; padding-bottom: 18px; }
.timeline .item::before { content: ""; position: absolute; left: -24px; top: 5px; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); border: 2px solid #fff; }
.timeline .meta { color: var(--muted); font-size: 12px; }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 8px 12px; font-size: 13px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }

/* login */
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #f6f8fc 0%, #e8f0ff 100%); }
.login-box { width: 380px; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 34px; box-shadow: 0 12px 40px rgba(27,95,217,.08); }
.login-box .logo { font-size: 20px; font-weight: 700; color: var(--blue); margin-bottom: 4px; }
.login-box .sub { color: var(--muted); font-size: 12px; margin-bottom: 26px; }
.login-box .btn { width: 100%; margin-top: 8px; }
.login-box .tip { margin-top: 18px; font-size: 11px; color: var(--muted); text-align: center; }

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; flex: none; border-right: 0; border-bottom: 1px solid var(--line); padding: 12px; }
  .nav { display: flex; flex-wrap: wrap; gap: 4px; }
  .nav-group { display: none; }
  .nav a { padding: 6px 10px; }
  .main { padding: 0 14px 32px; }
  .topbar { margin-left: -14px; margin-right: -14px; padding: 0 14px; }
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}