* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: #17202a;
  background: #f4f6f8;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.5;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  border-radius: 6px;
  background: #1f6feb;
  color: #fff;
  cursor: pointer;
  padding: 9px 14px;
}

button.secondary {
  background: #46515f;
}

button.danger {
  background: #b42318;
}

input,
textarea {
  width: 100%;
  border: 1px solid #c9d1d9;
  border-radius: 6px;
  padding: 9px 10px;
}

textarea {
  min-height: 160px;
  resize: vertical;
}

label {
  display: grid;
  gap: 6px;
  color: #46515f;
  font-size: 13px;
  font-weight: 600;
}

.auth-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.login-panel {
  width: min(360px, calc(100vw - 32px));
  border: 1px solid #d8dee4;
  border-radius: 8px;
  background: #fff;
  padding: 24px;
}

.login-panel h1,
.topbar h1 {
  margin: 0;
}

.stack {
  display: grid;
  gap: 10px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid #d8dee4;
  background: #fff;
  padding: 16px 24px;
}

.container {
  display: grid;
  gap: 16px;
  margin: 0 auto;
  max-width: 960px;
  padding: 24px;
}

.panel {
  border: 1px solid #d8dee4;
  border-radius: 8px;
  background: #fff;
  padding: 18px;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.link-list {
  display: grid;
  gap: 8px;
}

.form-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.node-list {
  display: grid;
  gap: 14px;
}

.node-item {
  display: grid;
  gap: 12px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 14px;
}

.node-edit-form {
  display: grid;
  gap: 12px;
}

.node-fields {
  grid-template-columns: 1.2fr 0.8fr 0.8fr 1.2fr;
}

.checkbox-row {
  align-items: center;
  display: flex;
  gap: 8px;
}

.checkbox-row input {
  width: auto;
}

.node-actions {
  display: flex;
  gap: 10px;
}

code {
  display: block;
  overflow-x: auto;
  border-radius: 6px;
  background: #eef2f6;
  padding: 10px;
  white-space: nowrap;
}

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

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

th {
  color: #46515f;
  font-size: 13px;
}

.empty {
  color: #6b7280;
  text-align: center;
}

.alert {
  border-radius: 6px;
  margin: 0 0 16px;
  padding: 10px 12px;
}

.alert.error {
  background: #fde8e8;
  color: #9b1c1c;
}

.alert.success {
  background: #def7ec;
  color: #03543f;
}

@media (max-width: 560px) {
  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .container {
    padding: 16px;
  }

  .form-grid,
  .node-fields {
    grid-template-columns: 1fr;
  }
}