:root {
  --bg: #f3efe6;
  --paper: #fbf8f2;
  --ink: #171c19;
  --ink-soft: #3c463f;
  --muted: #5e675f;
  --line: #ddd4c4;
  --line-strong: #c9bfae;
  --mast: #161a18;
  --mast-text: #f3efe6;
  --amber: #c4622d;
  --amber-deep: #8a3d12;
  --amber-soft: #f6e4d4;
  --front: #c4622d;
  --back: #1e6b48;
  --local: #1d4f6e;
  --green-soft: #e5f2eb;
  --blue-soft: #e4eef4;
  --shadow: 0 18px 40px rgba(22, 26, 24, 0.06);
  --serif: "Fraunces", "Iowan Old Style", Palatino, Georgia, serif;
  --sans: "Outfit", "Avenir Next", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --wrap: 1120px;
  --nav-h: 52px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

img, svg { max-width: 100%; }

a {
  color: var(--amber-deep);
  text-underline-offset: 0.18em;
}

a:hover { color: var(--amber); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

::selection {
  background: #f0d3b4;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--paper);
  color: var(--ink);
  padding: 0.5rem 0.8rem;
  z-index: 20;
}

.skip:focus { top: 0.6rem; }

[hidden] { display: none !important; }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: #efe8da;
  padding: 0.05em 0.32em;
  border-radius: 4px;
}

.wrap {
  width: min(var(--wrap), calc(100% - 2.4rem));
  margin-inline: auto;
}

.mast {
  background: var(--mast);
  color: var(--mast-text);
}

.mast-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 1.15rem 0 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--mast-text);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 560;
  letter-spacing: -0.03em;
}

.brand:hover { color: white; }

.mark {
  width: 12px;
  height: 15px;
  border: 1.6px solid #e08a3c;
  border-radius: 2px;
  position: relative;
  flex: none;
}

.mark::before,
.mark::after {
  content: "";
  position: absolute;
  left: 2px;
  height: 1.5px;
  background: #e08a3c;
}

.mark::before {
  top: 4px;
  width: 6px;
}

.mark::after {
  top: 8px;
  width: 4px;
}

.issue {
  margin: 0;
  color: #c9c2b4;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251, 248, 242, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-row {
  display: flex;
  gap: 0.3rem;
  min-height: var(--nav-h);
  align-items: center;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
}

.nav a:hover { background: rgba(196, 98, 45, 0.08); color: var(--ink); }

.nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--amber-soft);
}

.page { padding: 2.6rem 0 4rem; }

.kicker {
  margin: 0 0 0.45rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber-deep);
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 560;
  letter-spacing: -0.03em;
  line-height: 1.08;
}

h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(2.5rem, 6vw, 4.6rem);
}

h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}

h3 { margin: 0 0 0.4rem; font-size: 1.35rem; }

.lede {
  margin: 0;
  max-width: 40rem;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.25rem, 2vw, 1.55rem);
  line-height: 1.35;
  color: var(--ink-soft);
}

.lead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(240px, 0.7fr);
  gap: 2.5rem;
  align-items: start;
  margin-top: 2rem;
}

.essay p { margin: 0 0 1rem; }

.essay p:last-child { margin-bottom: 0; }

.jobs {
  background: var(--mast);
  color: var(--mast-text);
  padding: 1.2rem 1.2rem 0.6rem;
  border-radius: 16px;
}

.jobs h2 {
  color: #e08a3c;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

.jobs ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.jobs li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  padding: 0.85rem 0;
  border-top: 1px solid rgba(243, 239, 230, 0.12);
}

.jobs li strong { display: block; font-weight: 560; }

.jobs li span { color: #c9c2b4; font-size: 0.95rem; }

.jobs .n {
  font-family: var(--mono);
  color: #e08a3c;
  font-size: 0.85rem;
  padding-top: 0.15rem;
}

.section { margin-top: 3.6rem; }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-head p { margin: 0; color: var(--muted); max-width: 36rem; }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.2rem 0 1rem;
}

.filters button,
.tabs button,
.btn {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
}

.filters button[aria-pressed="true"],
.tabs button[aria-selected="true"] {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.wire-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line-strong);
}

.wire {
  display: grid;
  grid-template-columns: 9.2rem 1fr;
  gap: 1.2rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.wire time {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  padding-top: 0.25rem;
}

.wire h3 { font-size: 1.45rem; }

.wire h3 a { color: inherit; text-decoration: none; }

.wire h3 a:hover { color: var(--amber-deep); }

.wire p { margin: 0.25rem 0 0; color: var(--ink-soft); }

.wire .more {
  display: inline-block;
  margin-top: 0.45rem;
  font-size: 0.92rem;
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.8rem;
}

.flow-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-height: 180px;
  padding: 1rem 1rem 0.9rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
}

.flow-card:hover {
  border-color: var(--amber);
  color: inherit;
}

.flow-card .num {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--amber-deep);
}

.flow-card p {
  margin: 0;
  color: var(--ink-soft);
  flex: 1;
}

.flow-card .go {
  font-size: 0.92rem;
  color: var(--amber-deep);
}

.board {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}

.board th,
.board td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--line);
}

.board th {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  background: #f7f3ea;
}

.board tr:last-child td { border-bottom: 0; }

.board a { font-weight: 560; }

.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  white-space: nowrap;
}

.pill.stable { background: var(--green-soft); color: var(--back); }
.pill.draft { background: var(--amber-soft); color: var(--amber-deep); }
.pill.early { background: #f8e4df; color: #8f3d32; }
.pill.program { background: var(--blue-soft); color: var(--local); }

.callouts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin: 1.6rem 0 1.4rem;
}

.callout {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem 1.1rem 0.4rem;
}

.callout h2 { font-size: 1.25rem; }

.callout ul { margin: 0; padding-left: 1.1rem; }

.callout li { margin: 0 0 0.7rem; }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.1rem;
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.legend span { display: inline-flex; align-items: center; gap: 0.4rem; }

.swatch {
  width: 1.4rem;
  height: 3px;
  border-radius: 99px;
  background: currentColor;
}

.swatch.front { color: var(--front); background: var(--front); }
.swatch.back { color: var(--back); background: var(--back); }
.swatch.local { color: var(--local); background: var(--local); }

.flow-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.75fr);
  gap: 1rem;
  align-items: start;
}

.flow-stage {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.9rem 0.85rem 0.8rem;
  overflow-x: auto;
}

.seq { min-width: calc(var(--actors) * 148px); }

.seq-actors,
.step,
.lifeline-layer {
  display: grid;
  grid-template-columns: repeat(var(--actors), minmax(0, 1fr));
}

.actor {
  text-align: center;
  padding: 0.35rem 0.3rem 0.8rem;
}

.actor strong {
  display: block;
  font-family: var(--serif);
  font-weight: 560;
  font-size: 1.02rem;
}

.actor span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}

.seq-steps { position: relative; }

.lifeline-layer {
  position: absolute;
  inset: 0 0 0 0;
  pointer-events: none;
}

.lifeline-layer span {
  border-left: 1px dashed var(--line-strong);
  margin-left: 50%;
}

.step {
  position: relative;
  z-index: 1;
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  padding: 0.35rem 0;
  cursor: pointer;
}

.msg {
  grid-column: var(--col-start) / var(--col-end);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 0.25rem 0.35rem 0.85rem;
  color: var(--ink);
}

.msg.forward,
.msg.back {
  margin-inline: calc(100% / (var(--span) * 2));
}

.msg-meta {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
}

.chip {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--arrow, var(--muted));
}

.msg-title {
  font-size: 0.92rem;
  font-weight: 500;
  text-align: center;
  line-height: 1.25;
}

.route { display: none; }

.arrow {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.4rem;
  border-top: 1.6px solid var(--arrow, var(--ink));
}

.msg.forward .arrow::after,
.msg.back .arrow::after {
  content: "";
  position: absolute;
  top: -5px;
  border-style: solid;
}

.msg.forward .arrow::after {
  right: -1px;
  border-width: 5px 0 5px 7px;
  border-color: transparent transparent transparent var(--arrow, var(--ink));
}

.msg.back .arrow::after {
  left: -1px;
  border-width: 5px 7px 5px 0;
  border-color: transparent var(--arrow, var(--ink)) transparent transparent;
}

.ch-front { --arrow: var(--front); }
.ch-back { --arrow: var(--back); }
.ch-local { --arrow: var(--local); }

.msg.self {
  border: 1px dashed var(--arrow, var(--local));
  border-radius: 12px;
  margin-inline: 8%;
  padding-bottom: 0.45rem;
  background: color-mix(in srgb, var(--paper) 70%, var(--blue-soft));
}

.msg.self .arrow { display: none; }

.step.is-future { opacity: 0.78; }

.step.is-current .msg {
  background: #fff;
  border-radius: 12px;
  box-shadow: inset 0 0 0 1.5px var(--arrow, var(--amber));
}

.step.is-current .msg.self { background: var(--blue-soft); }

.seq-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.seq-status {
  margin: 0;
  flex: 1;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.key-hint {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.step-detail {
  position: sticky;
  top: calc(var(--nav-h) + 0.8rem);
  background: var(--mast);
  color: var(--mast-text);
  border-radius: 16px;
  padding: 1.1rem 1.1rem 1rem;
}

.step-detail .kicker { color: #e08a3c; }

.step-detail h3 {
  margin: 0 0 0.55rem;
  font-size: 1.55rem;
  color: white;
}

.step-detail p { margin: 0 0 0.8rem; color: #ddd6c8; }

.artifact-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #e08a3c;
}

.step-detail pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  color: #f3efe6;
  background: #101411;
  border-radius: 10px;
  padding: 0.75rem;
}

.tabs {
  display: flex;
  gap: 0.4rem;
  margin: 0 0 0.8rem;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.pager a { font-weight: 560; }

.sources { padding-left: 1.1rem; }

.sources li { margin: 0 0 0.55rem; }

.foot {
  border-top: 1px solid var(--line);
  padding: 1.4rem 0 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.foot p { margin: 0 0 0.4rem; }

.population {
  display: grid;
  gap: 0.55rem;
  margin-top: 1.3rem;
}

.pop-row {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  gap: 0.7rem;
  align-items: center;
  font-size: 0.92rem;
}

.bar {
  height: 8px;
  background: #e7e0d2;
  border-radius: 99px;
  overflow: hidden;
}

.bar span {
  display: block;
  height: 100%;
  background: var(--amber);
  border-radius: inherit;
}

.bar.short span { background: var(--back); }
.pop-row em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .lead-grid,
  .flow-layout,
  .callouts {
    grid-template-columns: 1fr;
  }

  .step-detail {
    position: sticky;
    top: calc(var(--nav-h) + 0.45rem);
    order: -1;
    max-height: 42vh;
    overflow: auto;
  }
}

@media (max-width: 760px) {
  .wrap { width: min(var(--wrap), calc(100% - 1.4rem)); }

  .mast-row { align-items: flex-start; flex-direction: column; gap: 0.2rem; }

  .wire { grid-template-columns: 1fr; gap: 0.2rem; }

  .seq { min-width: 0; }

  .seq-actors,
  .lifeline-layer { display: none; }

  .step { display: block; }

  .msg,
  .msg.forward,
  .msg.back,
  .msg.self {
    margin: 0;
    align-items: flex-start;
    border: 1px solid var(--line);
    border-left: 3px solid var(--arrow, var(--amber));
    border-radius: 12px;
    background: white;
    padding: 0.65rem 0.75rem 0.7rem;
  }

  .msg .arrow { display: none; }

  .msg-title, .msg-meta { text-align: left; }

  .route {
    display: block;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--muted);
  }

  .step.is-current .msg { box-shadow: none; }

  .board thead { display: none; }

  .board, .board tbody, .board tr, .board td { display: block; width: 100%; }

  .board tr {
    border-bottom: 1px solid var(--line);
    padding: 0.4rem 0 0.7rem;
  }

  .board td {
    border: 0;
    padding: 0.2rem 0.9rem;
  }

  .board td::before {
    content: attr(data-label);
    display: block;
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
  }

  .pop-row { grid-template-columns: 1fr auto; }
  .pop-row .bar { grid-column: 1 / -1; }
}

@media print {
  .nav, .seq-controls, .key-hint, .filters, .tabs, .skip { display: none; }
  body { background: white; }
  .step-detail, .jobs { background: white; color: black; }
  .step-detail h3, .step-detail p, .step-detail pre { color: black; }
  .flow-card, .step.is-future { opacity: 1; box-shadow: none; }
}