:root {
  --bg: #0b1020;
  --panel: #121a2f;
  --panel2: #0f1628;
  --border: #243049;
  --text: #e8eefc;
  --muted: #93a0bd;
  --accent: #5b9dff;
  --good: #3dd68c;
  --bad: #ff6b7a;
  --warn: #ffc857;
  --mono: "SF Mono", "Menlo", "Consolas", ui-monospace, monospace;
  --sans: "DM Sans", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(900px 500px at 10% -10%, #2a4a8a33, transparent 60%),
    radial-gradient(700px 400px at 90% 0%, #1f6b5433, transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
}

.mono {
  font-family: var(--mono);
}

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

.top {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
  background: #0c1324cc;
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
}

.logo {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(145deg, #5b9dff, #3dd68c);
  color: #061018;
  box-shadow: 0 8px 24px #5b9dff33;
}

h1 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.tag {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.example-label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--muted);
}

select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  min-width: 160px;
}

button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 600;
}

button.primary {
  background: linear-gradient(180deg, #6aa8ff, #3d7fe0);
  border-color: #2f6fd0;
  color: #fff;
}

button.primary:disabled {
  opacity: 0.55;
  cursor: wait;
}

a.btn-link {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.9rem;
}

a.btn-link:hover {
  border-color: var(--accent);
  color: #fff;
}

.mode-tabs {
  display: flex;
  gap: 4px;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 3px;
}

.mode-tab {
  border: none;
  background: transparent;
  color: var(--muted);
  border-radius: 9px;
  padding: 8px 12px;
  font-weight: 600;
}

.mode-tab.active {
  background: linear-gradient(180deg, #6aa8ff, #3d7fe0);
  color: #fff;
}

.mode-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-end;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: #0c1324aa;
}

.mode-bar .grow {
  flex: 1;
  min-width: 200px;
}

.mode-bar input[type="text"] {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  min-width: 220px;
  width: 100%;
  font-family: var(--mono);
  font-size: 0.85rem;
}

button.tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  color: var(--muted);
  padding: 8px 12px;
}

button.tab.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.badge {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
}

.badge.idle {
  color: var(--muted);
}
.badge.run {
  color: var(--warn);
  border-color: #6a5420;
}
.badge.pass {
  color: var(--good);
  border-color: #1f6b48;
  background: #12352866;
}
.badge.fail {
  color: var(--bad);
  border-color: #7a2f3a;
  background: #3a151c66;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding: 14px;
  min-height: calc(100vh - 140px);
}

.layout.studio {
  grid-template-columns: 1.1fr 1fr 0.95fr;
}

@media (max-width: 1200px) {
  .layout.studio {
    grid-template-columns: 1fr 1fr;
  }
  .books-pane {
    grid-column: 1 / -1;
    min-height: 360px;
  }
}

@media (max-width: 960px) {
  .layout,
  .layout.studio {
    grid-template-columns: 1fr;
  }
}

.pane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  min-height: 520px;
  overflow: hidden;
}

.pane-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--panel2);
}

.pane-head h2 {
  margin: 0;
  font-size: 0.95rem;
}

.hint {
  color: var(--muted);
  font-size: 0.8rem;
}

#source {
  flex: 1;
  width: 100%;
  min-height: 420px;
  border: 0;
  resize: vertical;
  padding: 14px 16px;
  background: #0a101e;
  color: #dce7ff;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.5;
  outline: none;
}

.error {
  margin: 0;
  padding: 12px 14px;
  background: #3a151c;
  color: #ffc0c7;
  border-top: 1px solid #7a2f3a;
  white-space: pre-wrap;
  font-family: var(--mono);
  font-size: 12.5px;
  max-height: 160px;
  overflow: auto;
}

.hidden {
  display: none !important;
}

.tabs {
  display: flex;
  gap: 4px;
  padding: 0 8px;
  border-bottom: 1px solid var(--border);
  background: var(--panel2);
}

.code {
  display: none;
  margin: 0;
  padding: 14px 16px;
  flex: 1;
  overflow: auto;
  background: #0a101e;
  color: #cfe0ff;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.5;
  white-space: pre;
}

.code.active {
  display: block;
}

.summary {
  font-size: 0.8rem;
  color: var(--muted);
}

.summary.pass {
  color: var(--good);
}
.summary.fail {
  color: var(--bad);
}

.foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 18px 20px;
  color: var(--muted);
  font-size: 0.85rem;
}

.foot a {
  color: var(--accent);
  text-decoration: none;
}

button.ghost {
  background: transparent;
  padding: 6px 10px;
  color: var(--muted);
}

/* Books: Notelog + Critic */
.books-pane {
  min-height: 520px;
}

.books-head {
  gap: 8px;
}

.book-tabs {
  display: flex;
  gap: 4px;
}

.book-tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.85rem;
}

.book-tab.active {
  color: var(--text);
  border-color: var(--border);
  background: #18233a;
}

.book-panel {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.book-panel.active {
  display: flex;
}

.book-blurb {
  margin: 0;
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.book-list {
  flex: 1;
  overflow: auto;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: #0a101e;
}

.book-empty {
  color: var(--muted);
  font-size: 0.85rem;
  padding: 16px 8px;
}

.book-entry {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel2);
  padding: 10px 12px;
}

.book-entry header {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-bottom: 6px;
}

.book-entry time {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
}

.pill {
  font-size: 0.68rem;
  font-family: var(--mono);
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  text-transform: lowercase;
}

.book-entry.sev-error {
  border-color: #7a2f3a;
}
.book-entry.sev-warn {
  border-color: #6a5420;
}
.book-entry.sev-error .pill.sev {
  color: var(--bad);
  border-color: #7a2f3a;
}
.book-entry.sev-warn .pill.sev {
  color: var(--warn);
  border-color: #6a5420;
}
.book-entry.kind-run .pill {
  color: var(--accent);
}

.book-body {
  margin: 0;
  white-space: pre-wrap;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.45;
  color: #d7e4ff;
}

.book-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 12px 12px;
  border-top: 1px solid var(--border);
  background: var(--panel2);
}

.book-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #0a101e;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 10px;
  resize: vertical;
  outline: none;
}

.critic-meta {
  display: flex;
  gap: 8px;
}

.critic-meta select {
  flex: 1;
  min-width: 0;
}