* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f2f4f8;
  color: #1f2937;
}

.container {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 16px;
}

.hidden {
  display: none;
}

h1,
h2 {
  margin-top: 0;
}

.panel {
  background: #ffffff;
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
}

.login-panel {
  max-width: 520px;
}

.help-text {
  margin: 0 0 10px;
  color: #374151;
  font-size: 13px;
}

.help-list {
  margin: 0 0 10px 18px;
  color: #374151;
  font-size: 13px;
}

.help-list li {
  margin-bottom: 4px;
}

.hint-message {
  min-height: 22px;
  margin: 0;
  font-weight: bold;
}

.grid-3,
.grid-4,
.grid-5 {
  display: grid;
  gap: 10px;
  margin-bottom: 10px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.grid-5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.field-grid-4,
.field-grid-5 {
  display: grid;
  gap: 10px;
  margin-bottom: 10px;
}

.field-grid-3 {
  display: grid;
  gap: 10px;
  margin-bottom: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field-grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.field-grid-5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.field-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 12px;
  color: #374151;
}

.field-check-item {
  justify-content: flex-start;
}

.check-inline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
}

.grid-login {
  display: grid;
  gap: 10px;
  grid-template-columns: 2fr 1fr;
}

input,
select,
button,
textarea {
  border: 1px solid #d1d5db;
  border-radius: 6px;
  padding: 10px;
  font-size: 14px;
}

button {
  cursor: pointer;
  background: #2563eb;
  color: #ffffff;
  border: none;
}

button:hover {
  background: #1d4ed8;
}

.secondary {
  background: #4b5563;
}

.secondary:hover {
  background: #374151;
}

textarea {
  width: 100%;
}

.table-wrap {
  overflow-x: auto;
}

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

th,
td {
  border-bottom: 1px solid #e5e7eb;
  padding: 10px;
  text-align: left;
  font-size: 13px;
}

tr:hover {
  background: #f9fafb;
}

#message {
  min-height: 22px;
  font-weight: bold;
}

.action-buttons {
  display: flex;
  gap: 8px;
}

.danger {
  background: #dc2626;
}

.danger:hover {
  background: #b91c1c;
}

.device-id-cell {
  max-width: 280px;
  line-height: 1.4;
  word-break: break-all;
}

@media (max-width: 900px) {
  .grid-3,
  .grid-4,
  .grid-5,
  .grid-login,
  .field-grid-3,
  .field-grid-4,
  .field-grid-5 {
    grid-template-columns: 1fr;
  }
}