:root {
  --bg: #2e3339;
  --bg-2: #2a2f35;
  --panel: #23272c;
  --panel-2: #1f2327;
  --ink: #e6e8ea;
  --muted: #a4a9b1;
  --accent: #7bdc5a;
  --accent-2: #a6f36a;
  --line: #3a414a;
  --glow: rgba(123,220,90,0.55);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 800px at 15% 10%, rgba(65,70,78,0.6), transparent 60%),
    radial-gradient(1200px 800px at 85% 90%, rgba(45,50,58,0.8), transparent 60%),
    linear-gradient(135deg, var(--bg), var(--bg-2));
  font: 15px/1.4 "Trebuchet MS", "Segoe UI", sans-serif;
  min-height: 100vh;
}
.page {
  width: 100%;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 0;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(40,44,50,0.98), rgba(30,34,39,0.98));
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.85rem;
}
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 0.4rem 0.7rem;
  font: 600 0.85rem/1 "Segoe UI", sans-serif;
  cursor: pointer;
  border-radius: 4px;
}
button.primary {
  border-color: #4a7f4d;
  color: #0f1514;
  background: linear-gradient(135deg, #7bdc5a, #b0f27a);
  text-shadow: 0 1px 0 rgba(255,255,255,0.35);
}
button.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(123,220,90,0.2);
}
.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 300px;
  gap: 0;
  min-height: calc(100vh - 56px);
}
.panel {
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 0.9rem 0.8rem;
}
.panel:last-child {
  border-right: none;
  border-left: 1px solid var(--line);
}
.panel h2 {
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #c8cbd2;
}
.hint {
  color: var(--muted);
  font-size: 0.82rem;
  margin-bottom: 0.6rem;
}
.sidebar {
  display: grid;
  gap: 0.8rem;
  align-content: start;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
}
.chain-list {
  display: grid;
  gap: 0.45rem;
}
.chain-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.45rem 0.5rem;
  background: #20252a;
  cursor: pointer;
  display: grid;
  gap: 0.2rem;
}
.chain-item.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(123,220,90,0.15);
}
.chain-title {
  font: 600 0.85rem/1.2 "Segoe UI", sans-serif;
  color: var(--accent-2);
}
.chain-meta {
  font-size: 0.72rem;
  color: var(--muted);
}
.canvas {
  position: relative;
  height: 100%;
  min-height: 520px;
  background:
    linear-gradient(90deg, transparent 23px, rgba(255,255,255,0.05) 24px),
    linear-gradient(0deg, transparent 23px, rgba(255,255,255,0.05) 24px),
    radial-gradient(600px 400px at 30% 20%, rgba(80,90,100,0.35), transparent 60%);
  background-size: 24px 24px;
  overflow: hidden;
}
svg.edges {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  filter: drop-shadow(0 0 6px var(--glow));
}
.ghost {
  stroke: #ffe08a;
  stroke-width: 2.5;
  fill: none;
  stroke-dasharray: 6 6;
}
.node {
  position: absolute;
  width: 150px;
  background: linear-gradient(180deg, #3c4148, #2b3036);
  border: 2px solid var(--accent);
  clip-path: polygon(10% 0%, 90% 0%, 100% 50%, 90% 100%, 10% 100%, 0% 50%);
  box-shadow: 0 0 12px rgba(123,220,90,0.25);
  user-select: none;
}
.node-header {
  padding: 0.5rem 0.6rem 0.2rem;
  cursor: grab;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.connector {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #0f1514;
  border: 2px solid var(--accent);
  box-shadow: 0 0 10px rgba(123,220,90,0.5);
  cursor: crosshair;
  flex-shrink: 0;
}
.node-title {
  font: 600 0.82rem/1.1 "Segoe UI", sans-serif;
  width: 100%;
  border: none;
  background: transparent;
  color: #dfe8d6;
  outline: none;
}
.node-body {
  padding: 0 0.6rem 0.5rem;
  font-size: 0.75rem;
  color: #c7ced6;
  display: grid;
  gap: 0.35rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font: 700 0.65rem/1 "Segoe UI", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.35rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(0,0,0,0.25);
  cursor: pointer;
  color: #cbd3da;
}
.badge.done { color: #b7ff9d; border-color: #7bdc5a; }
.badge.available { color: #ffe08a; border-color: #c6a453; }
.badge.locked { color: #9aa2ab; border-color: #59616a; }
.node.selected {
  outline: 2px solid #ffe08a;
  outline-offset: 2px;
  box-shadow: 0 0 16px rgba(255,224,138,0.35);
}
textarea {
  width: 100%;
  height: 260px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.6rem;
  font: 0.78rem/1.35 "Consolas", "Courier New", monospace;
  background: #1c2126;
  color: #cbd3da;
}

.props {
  display: grid;
  gap: 0.6rem;
}
.prop {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.55rem 0.6rem;
  background: rgba(0,0,0,0.12);
}
.label {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}
.prop input, .prop select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.45rem 0.5rem;
  background: #1c2126;
  color: #cbd3da;
  font: 0.82rem/1.25 "Segoe UI", sans-serif;
}
.prop textarea {
  height: auto;
  min-height: 110px;
}
.mono {
  font: 0.78rem/1.35 "Consolas", "Courier New", monospace;
  color: #cbd3da;
}
.row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 0.5rem;
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  display: inline-block;
}
.dot.connect { background: #ffe08a; }
.dot.drag { background: var(--accent); }
@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
  .panel:last-child { border-left: none; border-top: 1px solid var(--line); }
  .panel { border-right: none; border-bottom: 1px solid var(--line); }
  .canvas { min-height: 60vh; }
}