:root {
  color-scheme: light;
  --paper: #f8f0dd;
  --paper-deep: #efe0bc;
  --paper-soft: #fbf6e8;
  --ink: #30261c;
  --ink-muted: #6f614f;
  --ink-faint: #9b8d77;
  --line: #d9c79f;
  --line-strong: #b8975f;
  --clay: #9f4f32;
  --clay-dark: #733521;
  --sage: #647257;
  --sage-soft: #dfe5cf;
  --ochre: #bd8128;
  --blue-ink: #314f65;
  --shadow: 0 24px 60px rgba(87, 60, 26, 0.16);
  --radius-xl: 30px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --serif-display: "Fraunces", "Source Serif 4", Georgia, serif;
  --serif-body: "Source Serif 4", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 10%, rgba(189, 129, 40, 0.16), transparent 34rem),
    radial-gradient(circle at 82% 0%, rgba(100, 114, 87, 0.18), transparent 28rem),
    linear-gradient(180deg, var(--paper-soft), var(--paper));
  color: var(--ink);
  font-family: var(--serif-body);
  font-size: 18px;
  line-height: 1.65;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(90, 60, 30, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(90, 60, 30, 0.04) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, black, transparent 92%);
}

a {
  color: var(--clay-dark);
  text-decoration-color: rgba(159, 79, 50, 0.35);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-color: currentColor;
}

button,
summary {
  font: inherit;
}

button {
  cursor: pointer;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(159, 79, 50, 0.1);
  color: var(--clay-dark);
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  width: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--clay), var(--ochre), var(--sage));
  box-shadow: 0 0 16px rgba(159, 79, 50, 0.28);
}

.shell {
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 15;
  border-bottom: 1px solid rgba(185, 151, 95, 0.35);
  background: rgba(248, 240, 221, 0.84);
  backdrop-filter: blur(18px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 210px;
  text-decoration: none;
}

.mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--paper-deep);
  color: var(--clay-dark);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.brand strong {
  display: block;
  font-family: var(--serif-display);
  font-size: 18px;
  line-height: 1;
}

.brand span {
  display: block;
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding: 10px 0;
}

.nav a {
  flex: 0 0 auto;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 12px;
  text-decoration: none;
}

.nav a:hover,
.nav a.active {
  border-color: rgba(159, 79, 50, 0.25);
  background: rgba(255, 250, 237, 0.75);
  color: var(--clay-dark);
}

.actions {
  display: flex;
  gap: 8px;
}

.ghost-button {
  border: 1px solid rgba(159, 79, 50, 0.26);
  border-radius: 999px;
  background: rgba(255, 250, 237, 0.65);
  color: var(--clay-dark);
  font-family: var(--mono);
  font-size: 12px;
  padding: 9px 12px;
}

.ghost-button:hover,
.ghost-button[aria-pressed="true"] {
  border-color: rgba(159, 79, 50, 0.5);
  background: #fff6df;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 42px;
  padding: 78px 0 44px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--clay-dark);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--clay);
  content: "";
}

h1,
h2,
h3,
.display {
  font-family: var(--serif-display);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 0.98;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(56px, 10vw, 128px);
}

h2 {
  margin: 0 0 22px;
  font-size: clamp(36px, 5vw, 68px);
}

h3 {
  margin: 0 0 12px;
  font-size: clamp(25px, 3vw, 34px);
}

p {
  margin: 0 0 18px;
}

.lede {
  max-width: 720px;
  margin-top: 28px;
  color: var(--ink-muted);
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.35;
}

.hero-card {
  align-self: end;
  border: 1px solid rgba(184, 151, 95, 0.48);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(255, 250, 237, 0.9), rgba(239, 224, 188, 0.72)),
    var(--paper-deep);
  box-shadow: var(--shadow);
  padding: 28px;
}

.stamp {
  display: inline-flex;
  margin-bottom: 18px;
  border: 1px solid rgba(100, 114, 87, 0.38);
  border-radius: 999px;
  background: var(--sage-soft);
  color: #45503b;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.09em;
  padding: 6px 10px;
  text-transform: uppercase;
}

.thesis {
  margin: 0;
  font-family: var(--serif-display);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 560;
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.metadata {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.meta-item {
  border-top: 1px solid rgba(184, 151, 95, 0.45);
  padding-top: 12px;
}

.meta-item span {
  display: block;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.meta-item strong {
  display: block;
  margin-top: 3px;
  color: var(--ink);
  font-size: 18px;
}

main {
  padding-bottom: 88px;
}

.section {
  position: relative;
  margin-top: 52px;
  border-top: 1px solid rgba(184, 151, 95, 0.55);
  padding-top: 52px;
}

.section-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 52px;
}

.section-kicker {
  position: sticky;
  top: 100px;
  align-self: start;
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-kicker::after {
  display: block;
  width: 52px;
  height: 2px;
  margin-top: 18px;
  background: var(--clay);
  content: "";
}

.prose {
  max-width: 800px;
}

.prose > p {
  font-size: 21px;
}

.pullquote {
  margin: 28px 0;
  border-left: 4px solid var(--clay);
  padding: 4px 0 4px 22px;
  color: var(--clay-dark);
  font-family: var(--serif-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 580;
  letter-spacing: -0.028em;
  line-height: 1.05;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.note-card {
  border: 1px solid rgba(184, 151, 95, 0.5);
  border-radius: var(--radius-lg);
  background: rgba(255, 250, 237, 0.72);
  padding: 22px;
}

.note-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--clay-dark);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.note-card p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 17px;
  line-height: 1.5;
}

.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}

.principle {
  min-height: 230px;
  border: 1px solid rgba(184, 151, 95, 0.55);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(255, 250, 237, 0.9), rgba(239, 224, 188, 0.52)),
    var(--paper-soft);
  padding: 26px;
}

.principle .number {
  display: block;
  margin-bottom: 26px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 13px;
}

.principle h3 {
  color: var(--clay-dark);
}

.principle p {
  color: var(--ink-muted);
}

.doc-types {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.doc-type {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  align-items: center;
  gap: 18px;
  border: 1px solid rgba(184, 151, 95, 0.45);
  border-radius: var(--radius-lg);
  background: rgba(255, 250, 237, 0.72);
  padding: 20px 22px;
}

.doc-type strong {
  color: var(--clay-dark);
  font-family: var(--serif-display);
  font-size: 26px;
  line-height: 1;
}

.doc-type p {
  margin: 0;
  color: var(--ink-muted);
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(49, 79, 101, 0.24);
  border-radius: 999px;
  background: rgba(49, 79, 101, 0.08);
  color: var(--blue-ink);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 6px 9px;
  text-transform: uppercase;
  white-space: nowrap;
}

.flow-wrap {
  margin-top: 30px;
  border: 1px solid rgba(184, 151, 95, 0.55);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(255, 250, 237, 0.86), rgba(239, 224, 188, 0.56)),
    var(--paper-soft);
  box-shadow: 0 18px 46px rgba(87, 60, 26, 0.1);
  padding: 24px;
}

.flow-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.flow-header p {
  max-width: 620px;
  margin: 0;
  color: var(--ink-muted);
}

.flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(120px, 1fr));
  gap: 14px;
}

.flow-node {
  position: relative;
  min-height: 126px;
  border: 1px solid rgba(184, 151, 95, 0.52);
  border-radius: var(--radius-lg);
  background: rgba(255, 250, 237, 0.82);
  color: var(--ink);
  padding: 18px;
  text-align: left;
}

.flow-node::after {
  position: absolute;
  top: 50%;
  right: -16px;
  width: 16px;
  height: 1px;
  background: var(--line-strong);
  content: "";
}

.flow-node:last-child::after {
  display: none;
}

.flow-node span {
  display: block;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.flow-node strong {
  display: block;
  margin-top: 16px;
  font-family: var(--serif-display);
  font-size: 22px;
  line-height: 1;
}

.flow-node.active {
  border-color: rgba(159, 79, 50, 0.68);
  background: #fff3d2;
  box-shadow: inset 0 0 0 2px rgba(159, 79, 50, 0.12);
}

.flow-detail {
  margin-top: 18px;
  border-left: 3px solid var(--clay);
  padding-left: 18px;
}

.flow-detail h3 {
  margin-bottom: 6px;
  font-size: 28px;
}

.flow-detail p {
  margin: 0;
  color: var(--ink-muted);
}

.component-demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 30px;
}

.callout {
  border: 1px solid rgba(159, 79, 50, 0.28);
  border-radius: var(--radius-lg);
  background: rgba(255, 246, 223, 0.84);
  padding: 22px;
}

.callout[data-tone="sage"] {
  border-color: rgba(100, 114, 87, 0.35);
  background: rgba(223, 229, 207, 0.74);
}

.callout strong {
  display: block;
  margin-bottom: 8px;
  color: var(--clay-dark);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.callout[data-tone="sage"] strong {
  color: #45503b;
}

.callout p {
  margin: 0;
}

.callout ul.clean {
  margin: 4px 0 0;
}

.system-note {
  margin-top: 28px;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}

.pillar {
  position: relative;
  border: 1px solid rgba(184, 151, 95, 0.55);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(255, 250, 237, 0.92), rgba(239, 224, 188, 0.48)),
    var(--paper-soft);
  padding: 24px;
}

.pillar .pillar-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--clay-dark);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.pillar .pillar-mark::before {
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--clay);
  content: "";
}

.pillar h3 {
  margin-bottom: 10px;
  color: var(--clay-dark);
  font-size: 26px;
}

.pillar p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 16px;
  line-height: 1.5;
}

.chart-wrap {
  margin-top: 30px;
  border: 1px solid rgba(184, 151, 95, 0.55);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(255, 250, 237, 0.86), rgba(239, 224, 188, 0.56)),
    var(--paper-soft);
  box-shadow: 0 18px 46px rgba(87, 60, 26, 0.1);
  padding: 24px 26px 22px;
}

.chart-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.chart-header h3 {
  margin: 0;
  font-size: 22px;
}

.chart-header p {
  max-width: 460px;
  margin: 6px 0 0;
  color: var(--ink-muted);
  font-size: 15px;
  line-height: 1.45;
}

.chart-svg {
  display: block;
  width: 100%;
  height: auto;
}

.chart-caption {
  margin: 14px 0 0;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.term {
  position: relative;
  border-bottom: 1px dashed rgba(159, 79, 50, 0.5);
  color: var(--clay-dark);
  cursor: help;
}

.term:hover,
.term:focus-visible {
  background: rgba(255, 246, 223, 0.7);
  border-bottom-style: solid;
}

.term:focus-visible {
  outline: 2px solid rgba(159, 79, 50, 0.4);
  outline-offset: 2px;
  border-radius: 3px;
}

.term-tooltip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: -8px;
  z-index: 25;
  width: max-content;
  max-width: 320px;
  padding: 12px 14px;
  border: 1px solid rgba(184, 151, 95, 0.55);
  border-radius: var(--radius-md);
  background: var(--paper-soft);
  box-shadow: var(--shadow);
  color: var(--ink);
  font-family: var(--serif-body);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: 0;
  text-transform: none;
  white-space: normal;
}

.term-tooltip::after {
  position: absolute;
  top: 100%;
  left: 16px;
  width: 0;
  height: 0;
  border: 6px solid transparent;
  border-top-color: rgba(184, 151, 95, 0.55);
  content: "";
}

.decision-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

details {
  border: 1px solid rgba(184, 151, 95, 0.5);
  border-radius: var(--radius-lg);
  background: rgba(255, 250, 237, 0.7);
  overflow: hidden;
}

summary {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
  color: var(--clay-dark);
  font-family: var(--serif-display);
  font-size: 22px;
  font-weight: 620;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  color: var(--ink-faint);
  font-family: var(--mono);
}

details[open] summary::after {
  content: "-";
}

details p,
details ul {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--ink-muted);
}

ul.clean {
  padding-left: 1.1em;
}

ul.clean li {
  margin-bottom: 6px;
}

.roadmap {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}

.roadmap-phase {
  position: relative;
  border: 1px solid rgba(184, 151, 95, 0.5);
  border-radius: var(--radius-xl);
  background: rgba(255, 250, 237, 0.75);
  padding: 24px;
}

.roadmap-phase::before {
  display: block;
  width: 44px;
  height: 3px;
  margin-bottom: 22px;
  background: var(--sage);
  content: "";
}

.roadmap-phase h3 {
  font-size: 30px;
}

.roadmap-phase ul {
  margin: 16px 0 0;
  padding-left: 1.05em;
  color: var(--ink-muted);
}

.editable {
  outline: none;
}

.editable:focus-visible {
  border-radius: 8px;
  box-shadow: 0 0 0 4px rgba(159, 79, 50, 0.16);
}

.footer {
  border-top: 1px solid rgba(184, 151, 95, 0.55);
  padding: 34px 0 48px;
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 12px;
}

.focus-mode .nav,
.focus-mode .actions,
.focus-mode .section-kicker {
  display: none;
}

.focus-mode .topbar-inner {
  justify-content: center;
}

.focus-mode .section-grid {
  grid-template-columns: minmax(0, 1fr);
}

.focus-mode .prose {
  margin: 0 auto;
}

@media (max-width: 1024px) {
  .hero,
  .section-grid {
    grid-template-columns: 1fr;
  }

  .section-kicker {
    position: static;
  }

  .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-node::after {
    display: none;
  }

  .note-grid,
  .roadmap {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 17px;
  }

  .shell {
    width: min(100% - 26px, var(--max-width));
  }

  .topbar-inner {
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px 0;
  }

  .brand {
    min-width: auto;
  }

  .actions {
    width: 100%;
  }

  .ghost-button {
    flex: 1;
  }

  .hero {
    padding-top: 44px;
  }

  .metadata,
  .principles,
  .pillars,
  .component-demo {
    grid-template-columns: 1fr;
  }

  .chart-header {
    flex-direction: column;
    gap: 8px;
  }

  .doc-type {
    grid-template-columns: 1fr;
  }

  .doc-type .pill {
    justify-self: start;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 52px;
  }

  .hero-card,
  .principle,
  .flow-wrap,
  .roadmap-phase {
    border-radius: 22px;
    padding: 20px;
  }

  .flow {
    grid-template-columns: 1fr;
  }
}

@media print {
  body {
    background: #fffdf4;
    color: #211911;
  }

  .topbar,
  .progress,
  .actions {
    display: none;
  }

  .shell {
    width: auto;
    margin: 0;
  }

  .section,
  .hero {
    break-inside: avoid;
    padding-top: 28px;
  }

  .hero-card,
  .note-card,
  .principle,
  .flow-wrap,
  details,
  .roadmap-phase {
    box-shadow: none;
  }
}