:root {
  --bg: #0f1419;
  --panel: #1a2332;
  --card: #243044;
  --text: #e7eef8;
  --muted: #8fa3bf;
  --accent: #3d8bfd;
  --border: #31425a;
  --danger: #f07178;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(160deg, #0b1220, #152238 45%, #0f1419);
  color: var(--text);
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
.auth-body {
  display: grid;
  place-items: center;
}
.auth-card, .card, .topbar, .panel {
  background: rgba(26, 35, 50, 0.92);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.auth-card {
  width: min(420px, 92vw);
  padding: 28px;
  display: grid;
  gap: 12px;
}
.auth-card h1 { margin: 0; font-size: 1.4rem; }
.muted { color: var(--muted); margin: 0; }
label {
  display: grid;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}
input, select, textarea, button {
  font: inherit;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #121a27;
  color: var(--text);
  padding: 10px 12px;
}
button {
  background: var(--accent);
  border-color: transparent;
  cursor: pointer;
  color: #fff;
  font-weight: 600;
}
button.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.error { color: var(--danger); min-height: 1.2em; }
.topbar {
  margin: 16px;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 18px;
  border-radius: 14px;
}
.brand { font-weight: 700; }
.topbar nav { display: flex; gap: 12px; flex: 1; }
.topbar nav a {
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 8px;
}
.topbar nav a.active, .topbar nav a:hover {
  color: var(--text);
  background: rgba(61, 139, 253, 0.15);
}
main { padding: 0 16px 32px; }
.panel { display: none; padding: 18px; margin-bottom: 16px; }
.panel.active { display: block; }
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
}
.stat .label { color: var(--muted); font-size: 0.85rem; }
.stat .value { font-size: 1.6rem; font-weight: 700; margin-top: 6px; }
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}
.card { padding: 14px; margin-top: 12px; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th, td {
  text-align: left;
  padding: 8px 6px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th { color: var(--muted); font-weight: 600; }
.toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.hidden { display: none !important; }
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(61, 139, 253, 0.2);
  color: #9ec1ff;
  font-size: 0.8rem;
}