* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Microsoft YaHei", Arial, sans-serif;
  background: #f4f6f8;
  color: #1f2933;
}

button,
input {
  font: inherit;
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 220px 1fr;
}

.sidebar {
  background: #111827;
  color: #fff;
  padding: 18px 12px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  padding: 8px 10px 20px;
  color: #ff8a00;
}

.nav {
  width: 100%;
  border: 0;
  background: transparent;
  color: #cbd5e1;
  text-align: left;
  padding: 11px 12px;
  border-radius: 6px;
  cursor: pointer;
}

.nav.active,
.nav:hover {
  background: #1f2937;
  color: #fff;
}

.main {
  padding: 20px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin-bottom: 16px;
}

h1 {
  margin: 0;
  font-size: 24px;
}

p {
  margin: 4px 0 0;
  color: #6b7280;
}

.login-form {
  display: flex;
  gap: 8px;
}

.login-form input {
  width: 120px;
  border: 1px solid #d8dee6;
  border-radius: 6px;
  padding: 8px 10px;
}

.login-form button,
.primary {
  border: 0;
  background: #ff8a00;
  color: #fff;
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
}

.message {
  min-height: 24px;
  color: #b45309;
}

.content {
  display: grid;
  gap: 14px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(160px, 1fr));
  gap: 12px;
}

.card,
.panel {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 16px;
}

.metric {
  font-size: 28px;
  font-weight: 700;
  margin-top: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
}

th,
td {
  padding: 11px 12px;
  border-bottom: 1px solid #edf0f3;
  text-align: left;
  font-size: 14px;
}

th {
  background: #f9fafb;
  color: #4b5563;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #fff3e4;
  color: #9a4f00;
  font-size: 12px;
  margin-right: 4px;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: flex; overflow-x: auto; }
  .nav { width: auto; white-space: nowrap; }
  .cards { grid-template-columns: 1fr 1fr; }
}