:root {
  --bg: #0d1013;
  --surface: #14181d;
  --surface-2: #1a1f26;
  --surface-3: #232a33;
  --border: #262d36;
  --text: #e6e9ee;
  --text-dim: #8b95a3;
  --text-faint: #5c6572;
  --accent: #7dd3fc;
  --accent-2: #a78bfa;
  --success: #4ade80;
  --warn: #fbbf24;
  --danger: #f87171;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

header {
  padding: 12px 20px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand .logo { color: var(--accent-2); font-size: 22px; }
.brand .title { font-weight: 600; font-size: 17px; letter-spacing: -0.01em; }
.brand .tagline { color: var(--text-faint); font-size: 12px; }
.version { color: var(--text-faint); font-size: 11px; font-family: var(--mono); }

main {
  flex: 1;
  display: grid;
  grid-template-rows: 1fr auto 1fr;
  gap: 12px;
  padding: 12px;
  min-height: 0;
}

.editor, .output {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  min-height: 0;
}

.pane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}
.pane-header {
  padding: 8px 12px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

textarea {
  flex: 1;
  background: transparent;
  border: 0;
  outline: 0;
  resize: none;
  padding: 12px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  tab-size: 2;
}

.run-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 4px;
}

button {
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
}
button:hover { background: var(--surface-3); }
button.primary {
  background: var(--accent);
  color: #0b1220;
  border-color: var(--accent);
  font-weight: 600;
}
button.primary:hover { filter: brightness(1.1); }
button.primary:disabled { opacity: 0.5; cursor: wait; }
button.ghost {
  background: transparent;
  color: var(--text-dim);
  padding: 3px 8px;
  font-size: 12px;
}
button.ghost:hover { color: var(--text); background: var(--surface-3); }

.status { color: var(--text-dim); font-family: var(--mono); font-size: 12px; }
.status.ok { color: var(--success); }
.status.err { color: var(--danger); }

.trace, .output-panel {
  flex: 1;
  overflow: auto;
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
}

/* Trace styling */
.trace-line {
  padding: 6px 8px;
  margin-bottom: 4px;
  border-radius: 4px;
  border-left: 3px solid transparent;
}
.trace-line.batch { border-color: var(--accent); background: rgba(125, 211, 252, 0.05); }
.trace-line.batch-j { border-color: #a78bfa; background: rgba(167, 139, 250, 0.06); }   /* J = purple */
.trace-line.batch-l { border-color: #7dd3fc; background: rgba(125, 211, 252, 0.06); }   /* L = cyan */
.trace-line.batch-m { border-color: #fbbf24; background: rgba(251, 191, 36, 0.06); }    /* M = amber */
.trace-line.batch-p { border-color: #4ade80; background: rgba(74, 222, 128, 0.06); }    /* P = green */
.trace-line.branch { border-color: var(--accent-2); background: rgba(167, 139, 250, 0.05); }
.trace-line.emit { border-color: var(--success); background: rgba(74, 222, 128, 0.05); }
.trace-line.jump { border-color: var(--warn); background: rgba(251, 191, 36, 0.05); }
.trace-line.halt { border-color: var(--text-faint); background: rgba(92, 101, 114, 0.05); }
.trace-line .pc { color: var(--text-faint); margin-right: 8px; }
.trace-line .kind { display: inline-block; min-width: 40px; font-weight: 700; text-align: center; padding: 0 6px; border-radius: 3px; }
.trace-line .kind.batch { color: var(--accent); }
.trace-line .kind.batch-j { color: #a78bfa; background: rgba(167, 139, 250, 0.14); }
.trace-line .kind.batch-l { color: #7dd3fc; background: rgba(125, 211, 252, 0.14); }
.trace-line .kind.batch-m { color: #fbbf24; background: rgba(251, 191, 36, 0.14); }
.trace-line .kind.batch-p { color: #4ade80; background: rgba(74, 222, 128, 0.14); }
.trace-line .kind.branch { color: var(--accent-2); }
.trace-line .kind.emit { color: var(--success); }
.trace-line .kind.halt { color: var(--text-faint); }
.trace-line .kind.jump { color: var(--warn); }
.trace-line .meta { color: var(--text-faint); font-size: 11px; margin-top: 4px; padding-left: 78px; }
.trace-line .judge-row { padding-left: 78px; color: var(--text-dim); }
.trace-line .judge-row .reg { color: var(--accent); }
.trace-line .judge-row .kind-tag { color: var(--accent-2); }
.trace-line .judge-row .result { color: var(--text); }

/* Output panel */
.output-panel h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin: 12px 0 6px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}
.output-panel h3:first-child { margin-top: 0; }
.reg-row {
  padding: 4px 0;
  display: flex;
  gap: 8px;
  align-items: baseline;
}
.reg-row .name { color: var(--accent-2); min-width: 40px; font-weight: 600; }
.reg-row .val { color: var(--text); }
.emit-item {
  padding: 6px 10px;
  background: var(--surface-2);
  border-radius: 4px;
  margin-bottom: 6px;
  color: var(--success);
}
.stats { color: var(--text-dim); font-size: 12px; padding: 8px 0; }
.stats span { color: var(--text); margin-right: 12px; }
.error {
  color: var(--danger);
  background: rgba(248, 113, 113, 0.05);
  padding: 10px 12px;
  border-radius: 4px;
  border-left: 3px solid var(--danger);
  white-space: pre-wrap;
}

/* Template picker */
.template-picker {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  justify-content: flex-end;
  min-width: 0;
}
.tpl-select {
  padding: 3px 10px;
  font-size: 12px;
  font-family: inherit;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  outline: none;
}
.tpl-select:hover { background: var(--surface-3); }
.tpl-select:focus { border-color: var(--accent); }
.tpl-tagline {
  color: var(--text-faint);
  font-size: 11px;
  font-family: var(--mono);
  text-transform: none;
  letter-spacing: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Mode tabs */
.mode-tabs { display: flex; gap: 0; }
.mode-tabs .tab {
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid var(--border);
  border-radius: 4px 4px 0 0;
  background: transparent;
  color: var(--text-faint);
  cursor: pointer;
  margin-bottom: -1px;
}
.mode-tabs .tab:first-child { border-right: none; border-radius: 4px 0 0 0; }
.mode-tabs .tab:last-child { border-radius: 0 4px 0 0; }
.mode-tabs .tab.active {
  background: var(--surface);
  color: var(--accent);
  border-bottom-color: var(--surface);
}
.mode-tabs .tab:not(.active):hover { color: var(--text-dim); }

/* Hidden utility */
.hidden { display: none !important; }

/* JASM preview in SDK mode */
.jasm-preview {
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  max-height: 40%;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
}
.jasm-preview .preview-header {
  padding: 4px 12px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  border-bottom: 1px solid var(--border);
}
.jasm-preview .preview-header .text-faint { color: var(--text-faint); }
.jasm-preview pre {
  margin: 0;
  padding: 8px 12px;
  color: var(--accent);
  white-space: pre-wrap;
  word-break: break-all;
}