:root {
  --color-bg: #f6f7f9;
  --color-surface: #ffffff;
  --color-border: #d9dee7;
  --color-text: #17202a;
  --color-muted: #667085;
  --color-primary: #2563eb;
  --color-primary-strong: #1d4ed8;
  --color-danger: #b42318;
  --color-danger-soft: #fee4e2;
  --color-success: #027a48;
  --color-success-soft: #dcfae6;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.08);
  --radius-sm: 6px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --font-main: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  font-size: 15px;
  line-height: 1.45;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
}

.side-nav {
  background: #111827;
  color: #f9fafb;
  padding: var(--space-5);
}

.side-nav__title {
  margin: 0 0 var(--space-5);
  font-size: 18px;
  font-weight: 700;
}

.side-nav__button {
  width: 100%;
  display: block;
  margin-bottom: var(--space-2);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: #d1d5db;
  text-align: left;
}

.side-nav__button:hover,
.side-nav__button.is-active {
  background: #243044;
  color: #ffffff;
}

.page-main {
  min-width: 0;
  padding: var(--space-6);
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.page-title {
  margin: 0;
  font-size: 26px;
  line-height: 1.2;
}

.page-subtitle {
  margin: var(--space-1) 0 0;
  color: var(--color-muted);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 13px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #ffffff;
  font-weight: 700;
}

.button:hover {
  background: var(--color-primary-strong);
}

.button.secondary {
  background: #e5e7eb;
  color: #111827;
}

.button.danger {
  background: var(--color-danger);
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.panel__body {
  padding: var(--space-4);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: #f2f4f7;
  color: #344054;
  font-size: 13px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.field {
  display: grid;
  gap: var(--space-1);
}

.field.full {
  grid-column: 1 / -1;
}

.field label {
  color: #344054;
  font-size: 13px;
  font-weight: 700;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  background: #ffffff;
  color: var(--color-text);
}

.field textarea {
  min-height: 86px;
  resize: vertical;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.status-pill.ok {
  background: var(--color-success-soft);
  color: var(--color-success);
}

.status-pill.error {
  background: var(--color-danger-soft);
  color: var(--color-danger);
}

.alert {
  display: none;
  margin-bottom: var(--space-4);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: #ffffff;
}

.alert.is-visible {
  display: block;
}

@media (max-width: 820px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: sticky;
    top: 0;
    z-index: 5;
  }

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