* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: #f5f6f8;
  color: #1f2937;
}

header {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: #172033;
  color: #fff;
}

header a {
  color: #dbeafe;
  text-decoration: none;
  margin-left: 18px;
}

main {
  max-width: 1180px;
  margin: 24px auto;
  padding: 0 18px;
}

.card,
.login-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 18px;
}

.login-card {
  max-width: 380px;
  margin: 80px auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stats strong {
  display: block;
  font-size: 30px;
  margin-top: 8px;
}

h1,
h2 {
  margin-top: 0;
}

label {
  display: block;
  margin-bottom: 14px;
  font-weight: 600;
}

input {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
}

button {
  width: 100%;
  padding: 10px 14px;
  border: 0;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

td input {
  margin-top: 0;
}

.small-button {
  width: auto;
  min-width: 68px;
  padding: 8px 12px;
}

.check-cell {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  font-weight: 400;
  white-space: nowrap;
}

.check-cell input {
  width: auto;
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 10px 8px;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
  vertical-align: top;
}

th {
  color: #4b5563;
  font-size: 13px;
}

.muted {
  color: #6b7280;
}

.error {
  color: #b91c1c;
  background: #fee2e2;
  padding: 10px;
  border-radius: 6px;
}

.success {
  color: #166534;
  background: #dcfce7;
  padding: 10px;
  border-radius: 6px;
}

.mono {
  font-family: Consolas, Monaco, monospace;
  word-break: break-all;
}

@media (max-width: 760px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }

  header {
    padding: 0 12px;
  }
}