/* DAO playground — single-page layout, no framework. */

:root {
  --bg: #0f1419;
  --bg-elev: #161b22;
  --bg-input: #0b0f14;
  --fg: #e6edf3;
  --fg-muted: #8b949e;
  --border: #30363d;
  --accent: #58a6ff;
  --accent-fg: #0d1117;
  --err: #ff7b72;
  --warn: #d29922;
  --ok: #3fb950;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 14px;
}

body {
  display: flex;
  flex-direction: column;
}

/* --- header --- */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand .logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.brand .tagline {
  color: var(--fg-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

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

select, input, textarea, button {
  font-family: inherit;
  font-size: 13px;
  color: var(--fg);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  outline: none;
}

select { padding-right: 26px; }

input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
}

button {
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  filter: brightness(1.1);
}

button.ghost:hover:not(:disabled) {
  border-color: var(--accent);
}

/* --- main --- */
main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(320px, 2fr) minmax(220px, 250px);
  min-height: 0;
}

main.files-hidden {
  grid-template-columns: minmax(0, 3fr) minmax(320px, 2fr);
}

main.files-hidden .files-pane {
  display: none;
}

button.toggle-on {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}

/* --- files pane --- */
.files-pane {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  background: var(--bg-elev);
  min-height: 0;
  overflow: auto;
}

.files-header {
  padding: 8px 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border);
}

.file-list {
  list-style: none;
  margin: 0;
  padding: 4px 0;
}

.file-group {
  padding: 6px 10px 2px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
}

.file-item {
  margin: 0;
}

.file-item button {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--fg);
  cursor: pointer;
  font-family: var(--mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-item button:hover {
  background: rgba(88, 166, 255, 0.08);
}

.file-item button.active {
  background: rgba(88, 166, 255, 0.18);
  color: var(--fg);
  border-left: 2px solid var(--accent);
  padding-left: 8px;
}

.file-item .file-icon {
  display: inline-block;
  width: 1em;
  color: var(--fg-muted);
  margin-right: 5px;
}

.file-item button.active .file-icon {
  color: var(--accent);
}

.editor-pane {
  display: flex;
  border-right: 1px solid var(--border);
  min-height: 0;
}

#editor {
  flex: 1;
  min-height: 0;
  overflow: auto;
}

/* CodeMirror 6 fills the container. */
.cm-editor {
  height: 100%;
  font-family: var(--mono);
  font-size: 13.5px;
}

.cm-editor.cm-focused {
  outline: none;
}

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

/* --- side pane --- */
.side-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.side-block {
  border-bottom: 1px solid var(--border);
  padding: 8px 16px;
  background: var(--bg-elev);
}

.side-block summary {
  cursor: pointer;
  user-select: none;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--fg-muted);
  padding: 4px 0;
}

.side-block summary:hover {
  color: var(--fg);
}

.side-block textarea,
.side-block input {
  width: 100%;
  margin-top: 6px;
  font-family: var(--mono);
  resize: vertical;
}

.side-block .small {
  font-size: 11px;
  margin: 6px 0 0 0;
  line-height: 1.4;
}

/* --- LLM provider settings list --- */
.providers-list {
  margin-top: 6px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.provider-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-input);
}

.provider-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.provider-name {
  font-weight: 600;
  font-size: 13px;
  color: var(--fg);
}

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

.provider-links a:hover {
  text-decoration: underline;
}

.provider-blurb {
  margin: 2px 0 4px 0;
}

.provider-row input {
  margin-top: 0;
}

.output-block {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--fg-muted);
}

.status {
  font-size: 11px;
  text-transform: none;
  letter-spacing: normal;
}

.status.ok { color: var(--ok); }
.status.err { color: var(--err); }
.status.warn { color: var(--warn); }

.output {
  flex: 1;
  margin: 0;
  padding: 12px 16px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--bg);
  color: var(--fg);
  min-height: 0;
}

.output .stderr {
  color: var(--err);
}

.output .meta {
  color: var(--fg-muted);
  font-style: italic;
}

/* Trace detail view — replaces program output when a trace row is
   clicked. Program output stays in its own container (display: none
   while detail is shown) so live writes accumulate behind it. */
.trace-detail {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.trace-detail-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.trace-detail-back {
  font-size: 11px;
  padding: 2px 8px;
}

.trace-detail-title {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-muted);
}

.trace-detail-fields {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 2px 12px;
  font-family: var(--mono);
  font-size: 12px;
  padding: 6px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.trace-detail-row {
  display: contents;
}

.trace-detail-key {
  color: var(--fg-muted);
}

.trace-detail-val {
  color: var(--fg);
  word-break: break-word;
}

.trace-detail-msg-label {
  color: var(--fg-muted);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.trace-detail-msg {
  margin: 0;
  padding: 8px 10px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg);
  white-space: pre-wrap;
  word-break: break-word;
}

/* --- trace panel --- */

.trace-block summary {
  display: flex;
  align-items: center;
  gap: 8px;
}

.trace-block .trace-status {
  margin-left: auto;
  font-family: var(--mono);
}

.trace-toolbar {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.trace-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  flex: 1;
  min-width: 0;
}

.trace-picker .trace-proc {
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--fg);
  border-radius: 999px;
  padding: 2px 10px;
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  line-height: 1.6;
}

.trace-picker .trace-proc.on {
  background: rgba(88, 166, 255, 0.18);
  border-color: var(--accent);
  color: var(--fg);
}

.trace-picker .trace-empty {
  color: var(--fg-muted);
  font-size: 11px;
  font-style: italic;
  padding: 2px 0;
}

.trace-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.trace-actions .small {
  padding: 2px 8px;
  font-size: 11px;
}

.trace-actions .trace-pause-on {
  background: var(--warn);
  color: var(--accent-fg);
  border-color: var(--warn);
}

.trace-events {
  margin-top: 8px;
  max-height: 260px;
  overflow: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 0;
}

.trace-events:empty::before {
  content: "(no events)";
  display: block;
  color: var(--fg-muted);
  font-style: italic;
  padding: 6px 10px;
}

.trace-row {
  display: grid;
  grid-template-columns: 32px 32px minmax(80px, 1fr) 16px minmax(80px, 1fr) 2fr;
  gap: 6px;
  padding: 1px 10px;
  white-space: nowrap;
  align-items: baseline;
}

.trace-row:hover {
  background: rgba(88, 166, 255, 0.06);
}

.trace-row.clickable {
  cursor: pointer;
}

.trace-row.selected {
  background: rgba(88, 166, 255, 0.18);
}

.trace-row .ts {
  color: var(--fg-muted);
  text-align: right;
}

.trace-row .arrow {
  text-align: center;
}

.trace-row .kind {
  text-align: center;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  align-self: center;
}

.trace-row .kind.send {
  color: var(--accent);
}

.trace-row .kind.recv {
  color: var(--ok);
}

.trace-row .from,
.trace-row .to {
  overflow: hidden;
  text-overflow: ellipsis;
}

.trace-row .msg {
  color: var(--fg-muted);
  overflow: hidden;
  text-overflow: ellipsis;
}

.trace-row .to-missing {
  color: var(--fg-muted);
  font-style: italic;
}

/* Inferred sender on receive rows. Erlang's receive trace carries no
   sender pid; the frontend correlates by FIFO-matching prior sends.
   Italics + faint underline cue "this came from correlation, not the
   runtime", so the user can trust send rows literally and read receive
   rows as "this is who we think sent it". */
.trace-row .inferred {
  font-style: italic;
  text-decoration: underline dotted var(--border);
  text-underline-offset: 2px;
}

/* --- trace view toggle (List / Tree) --- */
.trace-view-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
}

.trace-view-toggle button {
  border: none;
  border-radius: 0;
  padding: 2px 10px;
  font-size: 11px;
  background: var(--bg-input);
  color: var(--fg-muted);
}

.trace-view-toggle button + button {
  border-left: 1px solid var(--border);
}

.trace-view-toggle button.on {
  background: var(--accent);
  color: var(--accent-fg);
}

/* --- tree view --- */
.trace-tree {
  padding: 4px 0;
}

.trace-tree-proc {
  border-bottom: 1px solid var(--border);
}

.trace-tree-proc:last-child {
  border-bottom: none;
}

.trace-tree-proc > summary {
  list-style: none;
  cursor: pointer;
  user-select: none;
  padding: 4px 10px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg);
}

.trace-tree-proc > summary::-webkit-details-marker {
  display: none;
}

.trace-tree-proc > summary:hover {
  background: rgba(88, 166, 255, 0.06);
}

.trace-tree-proc > summary::before {
  content: "▸";
  display: inline-block;
  width: 12px;
  color: var(--fg-muted);
  transition: transform 0.1s;
}

.trace-tree-proc[open] > summary::before {
  transform: rotate(90deg);
}

.trace-tree-proc .tree-proc-name {
  color: var(--accent);
}

.trace-tree-proc .tree-proc-count {
  color: var(--fg-muted);
  font-size: 11px;
}

.trace-tree-proc .tree-proc-summary {
  color: var(--fg-muted);
  font-size: 11px;
  margin-left: auto;
}

.trace-tree-rows {
  padding: 2px 0 6px 22px;
  border-left: 1px solid var(--border);
  margin-left: 16px;
}

.trace-tree-rows .trace-row {
  /* tighter columns inside the tree — `from` is redundant under the
     process node, so we collapse it into a thinner "self" marker. */
  grid-template-columns: 32px 32px 14px 16px minmax(80px, 1fr) 2fr;
}

.trace-tree-rows .trace-row .from {
  color: var(--fg-muted);
  text-align: center;
}

.trace-tree-empty {
  padding: 4px 10px 8px 38px;
  color: var(--fg-muted);
  font-style: italic;
  font-size: 11px;
}

/* --- footer --- */
footer {
  border-top: 1px solid var(--border);
  padding: 6px 16px;
  background: var(--bg-elev);
}

.muted { color: var(--fg-muted); }
.small { font-size: 11px; }

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

footer a:hover { text-decoration: underline; }

/* Narrow screens: stack panes. */
@media (max-width: 800px) {
  main {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(220px, 1fr) minmax(220px, 1fr) minmax(120px, auto);
  }
  main.files-hidden {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(220px, 1fr) minmax(220px, 1fr);
  }
  .files-pane {
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 200px;
  }
  .editor-pane {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}