:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --panel: #171a21;
  --card: #1d2230;
  --border: #2b3242;
  --text: #e8ecf5;
  --muted: #9aa3b5;
  --accent: #3d8bfd;
  --danger: #e35d6a;
  --ok: #3fbf7f;
  font-family:
    'Segoe UI',
    system-ui,
    -apple-system,
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 10% -10%, #1a2740, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

h1,
h2,
h3 {
  margin: 0 0 0.35rem;
}

.muted {
  color: var(--muted);
}

.hidden {
  display: none !important;
}

.panel {
  display: block;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.card,
.detail,
.item,
.group-chip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.card {
  padding: 1rem;
  display: grid;
  gap: 0.75rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
}

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

input,
textarea,
select {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 0.55rem 0.7rem;
}

button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
}

button.primary,
button.active {
  background: var(--accent);
  border-color: transparent;
  color: white;
}

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

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.tabs,
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
}

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1rem;
}

@media (max-width: 800px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.group-list,
.item-list {
  display: grid;
  gap: 0.5rem;
}

.group-chip,
.item {
  padding: 0.7rem 0.8rem;
  cursor: pointer;
}

.group-chip.active,
.item.active {
  outline: 2px solid var(--accent);
}

.detail {
  margin-top: 1rem;
  padding: 1rem;
  display: grid;
  gap: 0.75rem;
}

.detail pre {
  white-space: pre-wrap;
  background: var(--panel);
  border-radius: 8px;
  padding: 0.75rem;
  overflow: auto;
}

.error {
  margin-top: 1rem;
  color: var(--danger);
}

.session-meta {
  text-align: right;
  font-size: 0.9rem;
}

.row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.history li {
  margin-bottom: 0.35rem;
}