:root {
  --bg: #fbfaf8;
  --panel: #ffffff;
  --ink: #17171a;
  --ink-soft: #55555c;
  --ink-faint: #93938f;
  --line: #e7e5e0;
  --line-soft: #f0efeb;
  --accent: #b45309;
  --accent-soft: #fdf1e2;
  --green: #2f6f4e;
  --green-soft: #eaf3ee;
  --amber: #b45309;
  --amber-soft: #fdf1e2;
  --gray: #6b6b68;
  --gray-soft: #eeede9;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

body {
  font-size: 15px;
  line-height: 1.6;
}

.app {
  display: grid;
  grid-template-columns: 272px 1fr;
  min-height: 100vh;
}

/* ---------- Rail / nav ---------- */

.rail {
  border-right: 1px solid var(--line);
  padding: 28px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.rail-top { margin-bottom: 28px; }

.rail-mark {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin-bottom: 6px;
}

.rail-doctitle {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink);
}

.rail-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.rail-group-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 18px 0 8px;
  padding: 0 10px;
}
.rail-group-label:first-child { margin-top: 0; }

.rail-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 7px;
  cursor: pointer;
  color: var(--ink-soft);
  font-size: 13.5px;
  text-decoration: none;
  border: 1px solid transparent;
}

.rail-item:hover { background: var(--line-soft); }

.rail-item.active {
  background: var(--panel);
  border-color: var(--line);
  color: var(--ink);
  font-weight: 500;
}

.rail-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  width: 20px;
  flex-shrink: 0;
}

.rail-item.active .rail-num { color: var(--accent); }

.rail-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.rail-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--line);
}
.rail-dot.discuss { background: var(--amber); }
.rail-dot.approved { background: var(--green); }
.rail-dot.parked { background: var(--gray); }

.rail-count {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-faint);
  min-width: 12px;
  text-align: right;
}

.rail-foot {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}

/* ---------- Stage ---------- */

.stage {
  padding: 64px 56px 120px;
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .rail { position: relative; height: auto; border-right: none; border-bottom: 1px solid var(--line); }
  .stage { padding: 40px 24px 100px; }
}

.doc-header { margin-bottom: 8px; }

.doc-meta {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-bottom: 18px;
}

.doc-title {
  font-family: var(--serif);
  font-size: 44px;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

.doc-subtitle {
  font-size: 17px;
  color: var(--ink-soft);
  margin: 0 0 40px;
  max-width: 58ch;
}

.intro-body p {
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 20px;
  max-width: 62ch;
}
.intro-body p:first-child::first-letter {
  font-family: var(--serif);
  font-size: 3.1em;
  float: left;
  line-height: 0.85;
  padding: 0.05em 0.08em 0 0;
  color: var(--ink);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}

.step-num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-faint);
  margin-right: 10px;
}

.step-title {
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.18;
  margin: 0 0 30px;
  letter-spacing: -0.01em;
}

/* ---------- WHAT/WHY/WINS/VERDICT card grid ---------- */

.reason-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 36px;
}

.reason-cell {
  background: var(--panel);
  padding: 22px 24px;
}

.reason-cell h4 {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 10px;
}

.reason-cell p, .reason-cell li {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink);
  margin: 0;
}

.reason-cell ul { margin: 0; padding-left: 18px; }
.reason-cell li { margin-bottom: 6px; }
.reason-cell li:last-child { margin-bottom: 0; }

.verdict-cell { grid-column: 1 / -1; display: flex; align-items: center; gap: 16px; }
.verdict-badge {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  padding: 6px 12px;
  border-radius: 20px;
  background: var(--green-soft);
  color: var(--green);
  white-space: nowrap;
  flex-shrink: 0;
}
.verdict-text { font-size: 14.5px; color: var(--ink-soft); line-height: 1.6; }
.verdict-call { font-weight: 600; color: var(--ink); }

/* ---------- Layer sections (tech / sales / open) ---------- */

.layer {
  margin-bottom: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
}

.layer h3 {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.layer h3 .tag {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-faint);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.layer ul { margin: 0; padding-left: 20px; }
.layer li {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.layer.open li { color: var(--ink); }
.layer.open h3 { color: var(--accent); }

/* table (priority matrix) */

.mini-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin: 6px 0 4px;
}
.mini-table th, .mini-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line-soft);
}
.mini-table th {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  font-weight: 500;
}

.priority-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 36px;
}
.priority-table th, .priority-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  vertical-align: top;
}
.priority-table thead th {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  background: var(--line-soft);
  font-weight: 500;
}
.priority-table tbody tr:last-child td { border-bottom: none; }
.priority-table td.pri {
  font-family: var(--mono);
  font-size: 12.5px;
  white-space: nowrap;
}
.pri-p0 { color: #a3391d; font-weight: 600; }
.pri-p1 { color: var(--accent); }
.pri-p2 { color: var(--ink-faint); }

/* roadmap */

.phase {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin-bottom: 20px;
  background: var(--panel);
}
.phase-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 14px;
}
.phase-name {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.phase-title {
  font-family: var(--serif);
  font-size: 22px;
  margin: 2px 0 0;
}
.phase-estimate {
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--amber-soft);
  color: var(--amber);
}
.phase ul { margin: 0 0 14px; padding-left: 20px; }
.phase li { font-size: 14.5px; line-height: 1.65; color: var(--ink-soft); margin-bottom: 8px; }
.phase-note {
  font-size: 13.5px;
  color: var(--ink-faint);
  border-left: 2px solid var(--line);
  padding-left: 12px;
  margin-top: 10px;
  line-height: 1.6;
}
.phase-note.blocks { color: var(--accent); border-color: var(--accent); }

/* open questions list */

.question-list { list-style: none; margin: 0; padding: 0; }
.question-list li {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
}
.question-list li:last-child { border-bottom: none; }
.q-num { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); flex-shrink: 0; padding-top: 2px; }

/* ---------- Status + discussion ---------- */

.discuss-block {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.status-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.status-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.status-pill {
  font-size: 13px;
  padding: 7px 14px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink-soft);
  cursor: pointer;
  font-family: var(--sans);
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.status-pill:hover { border-color: var(--ink-faint); }
.status-pill.active.discuss { background: var(--amber-soft); border-color: var(--amber); color: var(--amber); font-weight: 600; }
.status-pill.active.approved { background: var(--green-soft); border-color: var(--green); color: var(--green); font-weight: 600; }
.status-pill.active.parked { background: var(--gray-soft); border-color: var(--gray); color: var(--gray); font-weight: 600; }

.comments-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 16px;
}

.comment-list { margin-bottom: 22px; display: flex; flex-direction: column; gap: 14px; }

.comment {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--panel);
}
.comment-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}
.comment-author { font-size: 13px; font-weight: 600; color: var(--ink); }
.comment-time { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); }
.comment-body { font-size: 14px; line-height: 1.6; color: var(--ink-soft); white-space: pre-wrap; }

.comment-empty {
  font-size: 13.5px;
  color: var(--ink-faint);
  font-style: italic;
  padding: 8px 0 18px;
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--panel);
}

.comment-form input, .comment-form textarea {
  font-family: var(--sans);
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 9px 12px;
  background: var(--bg);
  color: var(--ink);
  outline: none;
  resize: vertical;
}
.comment-form input:focus, .comment-form textarea:focus { border-color: var(--ink-faint); }
.comment-form textarea { min-height: 72px; font-family: var(--sans); }

.comment-form-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; }

.btn {
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 500;
  padding: 9px 18px;
  border-radius: 7px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  cursor: pointer;
  transition: opacity .15s ease;
}
.btn:hover { opacity: 0.82; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.form-hint { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); }

/* ---------- Prev/Next flow controls ---------- */

.flow-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  gap: 16px;
}

.flow-btn {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--panel);
  cursor: pointer;
  text-decoration: none;
  color: var(--ink);
  display: block;
}
.flow-btn:hover { border-color: var(--ink-faint); }
.flow-btn.next { text-align: right; }
.flow-btn-dir {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin-bottom: 4px;
}
.flow-btn-title { font-family: var(--serif); font-size: 17px; }
.flow-spacer { flex: 1; }

@media (max-width: 620px) {
  .reason-grid { grid-template-columns: 1fr; }
  .verdict-cell { flex-direction: column; align-items: flex-start; gap: 8px; }
  .doc-title { font-size: 32px; }
  .step-title { font-size: 26px; }
}