:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2a2d3a;
  --text: #e0e0e6;
  --muted: #888;
  --accent: #00c48f;
  --accent-dim: #00c48f33;
  --error: #ff5c5c;
  --changed: #ffd966;
  --pc-bg: #00c48f22;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--font-mono); font-size: 13px;
  background: var(--bg); color: var(--text);
  height: 100vh; display: flex; flex-direction: column;
}
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
}
header h1 { font-size: 15px; font-weight: 600; color: var(--accent); }
#status { color: var(--muted); font-size: 12px; }
main { flex: 1; display: flex; overflow: hidden; }
.panel {
  flex: 1; display: flex; flex-direction: column;
  border-right: 1px solid var(--border); overflow: hidden;
}
.panel:last-child { border-right: none; }
.panel h2 {
  padding: 8px 12px; font-size: 12px; text-transform: uppercase;
  letter-spacing: 1px; color: var(--muted); border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.panel h3 {
  padding: 6px 12px; font-size: 11px; text-transform: uppercase;
  letter-spacing: 1px; color: var(--muted); border-top: 1px solid var(--border); flex-shrink: 0;
}
.panel-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.panel-header h2 { padding: 0; border: none; }
#example-select {
  font-family: var(--font-mono); font-size: 11px;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); padding: 4px 8px; border-radius: 4px;
}
#editor {
  flex: 1; resize: none; background: var(--bg); color: var(--text); border: none;
  padding: 12px; font-family: var(--font-mono); font-size: 13px;
  line-height: 1.5; tab-size: 2; outline: none;
}
#errors {
  display: none; background: #2a1515; color: var(--error);
  padding: 8px 12px; font-size: 12px; max-height: 80px; overflow-y: auto; flex-shrink: 0;
}
.toolbar {
  display: flex; gap: 6px; padding: 8px 12px;
  border-top: 1px solid var(--border); flex-shrink: 0;
}
button {
  font-family: var(--font-mono); font-size: 12px; padding: 6px 14px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 4px; cursor: pointer; transition: background 0.15s;
}
button:hover { background: var(--border); }
button:active { background: var(--accent-dim); }
#btn-assemble {
  background: var(--accent); color: var(--bg);
  border-color: var(--accent); font-weight: 600;
}
#btn-assemble:hover { opacity: 0.9; }
#flags { padding: 8px 12px; display: flex; gap: 8px; flex-shrink: 0; }
.flag {
  display: inline-block; width: 28px; text-align: center; padding: 4px 0;
  border-radius: 4px; font-weight: 600; background: var(--bg);
  color: var(--muted); border: 1px solid var(--border);
}
.flag.active { background: var(--accent-dim); color: var(--accent); border-color: var(--accent); }
#registers { padding: 0 12px; flex-shrink: 0; }
#registers table { width: 100%; border-collapse: collapse; }
#registers th, #registers td {
  padding: 3px 6px; text-align: left; font-size: 12px; border-bottom: 1px solid var(--border);
}
#registers th { color: var(--muted); font-weight: normal; }
#registers tr.changed td { color: var(--changed); }
#memory { flex: 1; overflow-y: auto; padding: 0 12px; }
#memory table { width: 100%; border-collapse: collapse; }
#memory th, #memory td {
  padding: 2px 6px; font-size: 11px; border-bottom: 1px solid var(--border); white-space: nowrap;
}
#memory th { color: var(--muted); font-weight: normal; text-align: left; }
#memory tr.current-pc { background: var(--pc-bg); }
#output {
  height: 80px; overflow-y: auto; padding: 8px 12px;
  background: var(--bg); font-size: 12px; flex-shrink: 0;
}
#chat-messages { flex: 1; overflow-y: auto; padding: 12px; }
.message { margin-bottom: 12px; }
.message-label {
  display: block; font-size: 10px; text-transform: uppercase;
  letter-spacing: 1px; color: var(--muted); margin-bottom: 4px;
}
.message-content {
  background: var(--bg); padding: 8px 12px; border-radius: 6px;
  font-size: 12px; line-height: 1.5; white-space: pre-wrap; word-break: break-word;
}
.message.user .message-content { background: var(--accent-dim); border: 1px solid var(--accent); }
.quick-asks { display: flex; gap: 4px; padding: 4px 12px; flex-wrap: wrap; flex-shrink: 0; }
.quick-ask { font-size: 10px; padding: 4px 8px; border-radius: 12px; }
.chat-input-row {
  display: flex; gap: 6px; padding: 8px 12px;
  border-top: 1px solid var(--border); flex-shrink: 0;
}
#chat-input {
  flex: 1; font-family: var(--font-mono); font-size: 12px; padding: 6px 10px;
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 4px; outline: none;
}
#chat-input:focus { border-color: var(--accent); }
#chat-send { background: var(--accent); color: var(--bg); border-color: var(--accent); font-weight: 600; }
#btn-clear-chat {
  font-family: var(--font-mono); font-size: 11px;
  background: var(--bg); color: var(--muted);
  border: 1px solid var(--border); padding: 4px 10px; border-radius: 4px; cursor: pointer;
}
#btn-clear-chat:hover { color: var(--text); border-color: var(--text); }
#btn-clear-code {
  background: transparent; color: var(--muted); border-color: var(--border);
}
#btn-clear-code:hover { color: var(--text); border-color: var(--text); }