:root {
  --bg: #14110e;
  --bg-2: #1c1814;
  --paper: #221d18;
  --ink: #efe6d6;
  --muted: #9a8f7e;
  --line: #3a332b;
  --amber: #e0a45a;
  --amber-dim: #8a6230;
  --good: #8fbf88;
  --warn: #d47a5a;
  --mono: "IBM Plex Mono", "ui-monospace", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.rail {
  border-right: 1px solid var(--line);
  background: var(--bg-2);
  padding: 28px 20px 40px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}

.mark {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}
.rail h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 8px 0 6px;
}
.rail .tag {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 28px;
}

.progress-track {
  height: 3px;
  background: var(--line);
  margin: 0 0 18px;
}
.progress-fill {
  height: 3px;
  background: var(--amber);
  width: 0%;
}

.nav-group {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-dim);
  margin: 18px 0 8px;
}

.nav-item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  color: var(--muted);
  padding: 7px 8px;
  font: 13px/1.3 var(--sans);
  cursor: pointer;
  border-left: 2px solid transparent;
}
.nav-item:hover { color: var(--ink); }
.nav-item.current {
  color: var(--ink);
  border-left-color: var(--amber);
  background: rgba(224, 164, 90, 0.06);
}
.nav-item.done { color: var(--good); }
.nav-item:disabled { opacity: 0.35; cursor: not-allowed; }

.stage {
  padding: 40px 56px 80px;
  max-width: 820px;
}

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 10px;
}
h2.step-title {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

.prose p { margin: 0 0 14px; color: #e8ddcc; }
.prose ul { margin: 0 0 16px; padding-left: 1.1em; color: #e8ddcc; }
.prose li { margin-bottom: 6px; }
.prose strong { color: #fff8ea; font-weight: 600; }

.callout {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 14px 16px;
  margin: 18px 0;
  font-size: 15px;
}
.callout.warn { border-color: #6a3d30; }
.callout .label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 6px;
}

.cmd {
  font-family: var(--mono);
  font-size: 13px;
  background: #0e0c0a;
  border: 1px solid var(--line);
  padding: 12px 14px;
  margin: 12px 0 16px;
  white-space: pre-wrap;
  color: #f0d9a8;
}

label.field {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin: 14px 0 6px;
}
input[type="text"], textarea {
  width: 100%;
  background: #0e0c0a;
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 10px 12px;
  font: 15px/1.45 var(--sans);
}
textarea { min-height: 140px; resize: vertical; }
input:focus, textarea:focus {
  outline: none;
  border-color: var(--amber-dim);
}

.hint {
  font-size: 13px;
  color: var(--muted);
  margin-top: 6px;
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  flex-wrap: wrap;
}
button.btn {
  font-family: var(--sans);
  font-size: 14px;
  border: 1px solid var(--amber-dim);
  background: transparent;
  color: var(--ink);
  padding: 10px 16px;
  cursor: pointer;
}
button.btn.primary {
  background: var(--amber);
  border-color: var(--amber);
  color: #1a140c;
  font-weight: 600;
}
button.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
button.btn.ghost { border-color: var(--line); color: var(--muted); }

.export {
  font-family: var(--mono);
  font-size: 12px;
  background: #0e0c0a;
  border: 1px solid var(--line);
  padding: 16px;
  white-space: pre-wrap;
  max-height: 420px;
  overflow: auto;
}

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .rail {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .stage { padding: 28px 20px 60px; }
}