:root {
  --bg: #0f1117;
  --surface: #161b22;
  --ink: #e6edf3;
  --muted: #9aa4b2;
  --line: #2d333b;
  --accent: #2f81f7;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top right, #101926 0, var(--bg) 45%);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 15, 24, 0.9);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar h1 { margin: 0; font-size: 1.05rem; }
.actions { display: flex; gap: 0.55rem; flex-wrap: wrap; justify-content: flex-end; }
button {
  border: 1px solid var(--line);
  background: #1f2630;
  color: var(--ink);
  border-radius: 8px;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
}
button:hover { border-color: var(--accent); }

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) minmax(0, 1fr);
  gap: 0.8rem;
  min-height: calc(100vh - 60px);
  padding: 0.8rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  padding: 0.75rem;
  min-width: 0;
}
.panel h2 { margin: 0 0 0.6rem; font-size: 0.95rem; }

.tabs {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
  max-height: 65vh;
  overflow: auto;
}
.tab {
  text-align: left;
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.tab.is-active {
  border-color: var(--accent);
  box-shadow: inset 2px 0 0 var(--accent);
}

.editor-surface {
  position: relative;
  width: 100%;
  height: 50vh;
  border-radius: 10px;
  border: 1px solid var(--line);
  overflow: hidden;
  background: #0b1018;
}
/* Ace token colors (Nunchucks-friendly) */
.ace_editor .ace_meta.ace_tag,
.ace_editor .ace_entity.ace_name.ace_tag {
  color: #ce9178;
}

.ace_editor .ace_entity.ace_other.ace_attribute-name {
  color: #4fc1ff;
}

.ace_editor .ace_keyword,
.ace_editor .ace_keyword.ace_operator {
  color: #c586c0;
}

.ace_editor .ace_string {
  color: #ce9178;
}

.ace_editor .ace_constant.ace_numeric {
  color: #b5cea8;
}

.ace_editor .ace_variable,
.ace_editor .ace_support.ace_function {
  color: #9cdcfe;
}

.ace_editor .ace_storage,
.ace_editor .ace_keyword.ace_other {
  color: #dcdcaa;
}

.ace_editor .ace_comment {
  color: #6a9955;
}

.row {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.65rem;
}
.row span { color: var(--muted); font-size: 0.85rem; }
.row input, .row textarea {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #0b1018;
  color: var(--ink);
  padding: 0.45rem 0.55rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.context { min-height: 120px; }

.subtabs {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 0.6rem;
}
.view {
  border: 0;
  border-right: 1px solid var(--line);
  border-radius: 0;
}
.view:last-child { border-right: 0; }
.view.is-active { background: #0d2a4d; }

#previewFrame {
  width: 100%;
  height: 66vh;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

#codeOut {
  margin: 0;
  height: 66vh;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0b1018;
  padding: 0.65rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .editor-surface, #previewFrame, #codeOut { height: 45vh; }
}