:root {
  --black: #050505;
  --dark: #0a0a0a;
  --panel: #111111;
  --border: #333333;
  --text: #e5e5e5;
  --muted: #888888;
  --accent: #ffffff;
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--black);
  color: var(--text);
}

button {
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 0.55rem 0.8rem;
  cursor: pointer;
}

button:hover,
.node:hover {
  border-color: var(--accent);
}

button.ghost {
  background: transparent;
}

.top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-end;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--dark);
}

.eyebrow {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

h1 {
  margin: 0.25rem 0 0;
  font-weight: 300;
  font-size: 1.6rem;
}

.lede,
.hint {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.actions {
  display: flex;
  gap: 0.5rem;
}

.shell {
  display: grid;
  grid-template-columns: 180px 1fr 300px;
  min-height: calc(100vh - 280px);
}

.rail,
.inspect {
  padding: 1rem;
  border-right: 1px solid var(--border);
  background: var(--dark);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.inspect {
  border-right: 0;
  border-left: 1px solid var(--border);
}

.stage {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(var(--border) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--border) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--panel);
}

#wires {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#nodes {
  position: absolute;
  inset: 0;
}

.node {
  position: absolute;
  width: 168px;
  padding: 0.7rem 0.8rem 0.85rem;
  background: var(--dark);
  border: 1px solid var(--border);
  user-select: none;
  touch-action: none;
}

.node.selected {
  border-color: var(--accent);
}

.node .kind {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.node h2 {
  margin: 0.2rem 0 0;
  font-size: 1rem;
  font-weight: 400;
}

.ports {
  display: flex;
  justify-content: space-between;
  margin-top: 0.7rem;
}

.port {
  width: 12px;
  height: 12px;
  border: 1px solid var(--accent);
  background: var(--black);
  padding: 0;
}

.port.armed {
  background: var(--accent);
}

.inspect-form {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.inspect-form label {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.inspect-form select,
.inspect-form input {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.35rem;
  font-size: 12px;
}

#inspect-json {
  margin: 0;
  white-space: pre-wrap;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 12px;
  line-height: 1.45;
  color: var(--text);
}

.node.ghosting {
  outline: 1px dashed var(--accent);
}

body.ghost-mode .top {
  border-bottom-color: #666;
}

.approaches {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  overflow: auto;
}

.approach {
  border: 1px solid var(--border);
  padding: 0.6rem;
}

.approach.winner {
  border-color: var(--accent);
}

.approach h3 {
  margin: 0.2rem 0;
  font-weight: 400;
  font-size: 0.95rem;
}

.approach p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

.chat {
  border-top: 1px solid var(--border);
  background: var(--dark);
  padding: 0.8rem 1.5rem 1rem;
}

.chat-log {
  max-height: 140px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0.5rem 0;
}

.bubble {
  max-width: 70%;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  line-height: 1.4;
}

.bubble.user {
  align-self: flex-end;
  background: var(--panel);
}

.bubble.assistant {
  align-self: flex-start;
}

.chat-form {
  display: flex;
  gap: 0.5rem;
}

.chat-form textarea {
  flex: 1;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.5rem 0.7rem;
  font: inherit;
  resize: vertical;
}

@media (max-width: 900px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .rail,
  .inspect {
    border: 0;
    border-bottom: 1px solid var(--border);
  }

  .stage {
    min-height: 70vh;
  }
}