:root {
  --paper: #f3f0e8;
  --paper-deep: #eae5da;
  --surface: #fbfaf6;
  --ink: #1c1f1d;
  --ink-soft: #555b56;
  --muted: #626762;
  --line: #cec8bc;
  --line-strong: #aaa397;
  --accent: #1f6b7a;
  --accent-soft: #dcebea;
  --purple: #6946d7;
  --green: #187a59;
  --green-soft: #dceee5;
  --blue: #248bc5;
  --amber: #805019;
  --amber-soft: #f2e4ce;
  --red: #a1473f;
  --red-soft: #f0dfda;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Newsreader', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  overflow-x: clip;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body,
button,
a {
  -webkit-tap-highlight-color: transparent;
}

::selection {
  background: #cfe2e1;
  color: var(--ink);
}

a {
  color: inherit;
}

code {
  padding: 0.12em 0.34em;
  border: 1px solid rgba(31, 107, 122, 0.18);
  background: rgba(31, 107, 122, 0.07);
  color: #155766;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.container {
  width: min(1180px, calc(100% - 64px));
  margin-inline: auto;
}

.site-accent {
  position: fixed;
  inset: 0 0 auto;
  z-index: 200;
  height: 4px;
  background: linear-gradient(90deg, var(--purple) 0 36%, var(--blue) 36% 65%, #26ae7b 65% 100%);
}

.skip-link {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 300;
  padding: 10px 14px;
  transform: translateY(-180%);
  background: var(--ink);
  color: var(--surface);
  font-size: 13px;
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

/* Navigation */
.nav {
  position: fixed;
  inset: 4px 0 auto;
  z-index: 100;
  border-bottom: 1px solid transparent;
  background: rgba(243, 240, 232, 0.9);
  backdrop-filter: blur(16px);
  transition: border-color 180ms ease, background 180ms ease;
}

.nav.scrolled {
  border-bottom-color: var(--line);
  background: rgba(243, 240, 232, 0.97);
}

.nav-inner {
  width: min(1280px, calc(100% - 48px));
  height: 68px;
  margin-inline: auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 38px;
}

.nav-logo,
.nav-github,
.nav-links a {
  text-decoration: none;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav-logo-icon {
  width: 22px;
  height: 22px;
}

.nav-slash {
  margin-inline: 4px;
  color: var(--line-strong);
  font-weight: 400;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.nav-links a,
.nav-github {
  position: relative;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 600;
}

.nav-links a::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--accent);
  transition: transform 160ms ease;
}

.nav-links a:hover,
.nav-links a.active,
.nav-github:hover {
  color: var(--ink);
}

.nav-links a.active::after,
.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-github {
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  white-space: nowrap;
}

/* Cover */
.hero {
  position: relative;
  padding: 148px 0 54px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - 1px), rgba(31, 107, 122, 0.05) calc(50% - 1px), rgba(31, 107, 122, 0.05) 50%, transparent 50%),
    radial-gradient(circle at 88% 16%, rgba(36, 139, 197, 0.1), transparent 24%),
    var(--paper);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  column-gap: 110px;
  align-items: start;
}

.hero-content {
  min-width: 0;
  max-width: 760px;
}

.eyebrow,
.section-kicker,
.mini-heading,
.note-label {
  margin: 0;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.eyebrow::before {
  content: '';
  width: 34px;
  height: 2px;
  background: var(--accent);
}

.hero-title {
  max-width: 760px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(54px, 6.2vw, 88px);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 0.94;
}

.hero-subtitle {
  max-width: 700px;
  margin: 30px 0 0;
  color: var(--ink-soft);
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 38px;
}

.primary-link,
.text-link {
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 11px 16px;
  background: var(--ink);
  color: var(--surface);
}

.primary-link span {
  color: #a9d2d5;
}

.text-link {
  padding-bottom: 3px;
  border-bottom: 1px solid var(--line-strong);
}

.primary-link:hover {
  background: var(--accent);
}

.text-link:hover {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.hero-meta {
  padding-left: 26px;
  border-left: 1px solid var(--line-strong);
}

.report-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.report-mark img {
  width: 32px;
  height: 32px;
}

.meta-list {
  margin: 0;
}

.meta-list > div {
  display: grid;
  grid-template-columns: 94px 1fr;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.meta-list dt,
.meta-list dd {
  margin: 0;
  font-size: 12px;
  line-height: 1.5;
}

.meta-list dt {
  color: var(--muted);
}

.meta-list dd {
  font-weight: 600;
}

.meta-list a {
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}

.hero-facts {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 68px 0 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.hero-facts > div {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
  padding: 17px 22px;
  border-right: 1px solid var(--line);
}

.hero-facts > div:first-child {
  padding-left: 0;
}

.hero-facts > div:last-child {
  border-right: 0;
}

.hero-facts dt,
.hero-facts dd {
  margin: 0;
}

.hero-facts dt {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.06em;
}

.hero-facts dd {
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.3;
}

/* Report structure */
.report-section {
  padding: 112px 0;
  border-bottom: 1px solid var(--line);
}

.tinted-section {
  background: var(--paper-deep);
}

.section-grid {
  display: grid;
  grid-template-columns: 145px minmax(0, 1fr);
  gap: 55px;
  align-items: start;
}

.section-rail {
  position: sticky;
  top: 104px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 4px;
}

.section-number {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
}

.section-label {
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-content {
  min-width: 0;
}

.section-kicker {
  margin-bottom: 13px;
}

.section-title {
  max-width: 850px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 4.5vw, 62px);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.02;
}

.section-intro {
  max-width: 700px;
  margin: 22px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.72;
}

.lede-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(250px, 0.8fr);
  gap: 64px;
  margin-top: 48px;
}

.lede {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 2.4vw, 34px);
  letter-spacing: -0.02em;
  line-height: 1.26;
}

.overview-copy p {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 14px;
}

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

.version-ledger {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 64px;
  border-block: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.version-row {
  display: grid;
  grid-template-columns: minmax(70px, 1fr) auto auto auto;
  align-items: center;
  gap: 13px;
  padding: 24px;
  border-right: 1px solid var(--line);
}

.version-row:last-child {
  border-right: 0;
}

.component {
  font-size: 12px;
  font-weight: 700;
}

.old-version,
.version-row strong {
  font-family: var(--font-mono);
  font-size: 14px;
}

.old-version {
  color: var(--muted);
  text-decoration: line-through;
  text-decoration-color: var(--line-strong);
}

.version-row strong {
  color: var(--accent);
}

.version-arrow {
  color: var(--line-strong);
}

/* Phase ledger */
.phase-ledger {
  margin-top: 58px;
  border-top: 1px solid var(--line-strong);
}

.phase-row {
  display: grid;
  grid-template-columns: 155px minmax(0, 1fr);
  gap: 38px;
  padding: 42px 0 46px;
  border-bottom: 1px solid var(--line-strong);
}

.phase-index {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border: 1px solid currentColor;
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.status::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.status-complete {
  color: var(--green);
}

.status-progress {
  color: var(--amber);
}

.phase-body h3 {
  margin: 0 0 13px;
  font-size: 23px;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.phase-body > p {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.phase-evidence {
  margin: 24px 0 0;
  border-top: 1px solid var(--line);
}

.phase-evidence > div {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.phase-evidence dt,
.phase-evidence dd {
  margin: 0;
  font-size: 12px;
}

.phase-evidence dt {
  color: var(--muted);
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
}

.phase-evidence dd {
  color: var(--ink-soft);
}

.phase-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 21px;
}

.phase-links a,
.lesson a {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-decoration-color: rgba(31, 107, 122, 0.35);
  text-underline-offset: 4px;
}

.phase-open {
  position: relative;
}

.phase-open::before {
  content: '';
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: -24px;
  width: 4px;
  background: var(--amber);
}

.phase-note {
  display: inline-block;
  margin-top: 20px;
  padding: 6px 9px;
  background: var(--amber-soft);
  color: #774817;
  font-size: 11px;
  font-weight: 700;
}

/* Architecture */
.architecture-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 54px;
}

.architecture-panel {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
}

.architecture-current {
  border-top: 4px solid var(--red);
}

.architecture-target {
  border-top: 4px solid var(--green);
}

.architecture-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 17px;
  border-bottom: 1px solid var(--line);
}

.architecture-header h3 {
  margin: 0;
  font-size: 15px;
  letter-spacing: -0.015em;
}

.diagram-hint {
  display: none;
}

.diagram-state {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
}

.state-current {
  color: var(--red);
}

.state-target {
  color: var(--green);
}

.diagram-scroll {
  max-width: 100%;
  overflow-x: auto;
  scrollbar-color: var(--line-strong) transparent;
}

.diagram-scroll svg {
  display: block;
  width: 100%;
  height: auto;
  margin: 10px 0 0;
}

.architecture-note {
  min-height: 64px;
  margin: 0;
  padding-top: 15px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12px;
}

.node-input,
.node-mid {
  fill: #f3f0e8;
  stroke: #aaa397;
  stroke-width: 1;
}

.node-mid {
  fill: #ebe7df;
  stroke: #80796f;
}

.node-danger {
  fill: var(--red-soft);
  stroke: var(--red);
  stroke-width: 1.2;
}

.node-check {
  fill: var(--accent-soft);
  stroke: var(--accent);
  stroke-width: 1.2;
}

.node-plan,
.node-safe,
.node-safe-exec {
  fill: var(--green-soft);
  stroke: var(--green);
  stroke-width: 1.2;
}

.node-reject {
  fill: #f5e9e5;
  stroke: var(--red);
  stroke-width: 1;
  stroke-dasharray: 4 3;
}

.node-isolated {
  fill: var(--amber-soft);
  stroke: var(--amber);
  stroke-width: 1;
}

.node-label,
.node-label-sm,
.node-reject-item,
.danger-x,
.check-icon {
  font-family: var(--font-sans);
}

.node-label {
  fill: var(--ink);
  font-size: 12px;
  font-weight: 600;
}

.node-label-sm,
.node-reject-item {
  fill: var(--ink-soft);
  font-size: 10px;
  font-weight: 500;
}

.node-label.danger,
.node-label-sm.danger,
.reject-label {
  fill: var(--red);
}

.node-label.safe,
.node-label-sm.safe {
  fill: var(--green);
}

.edge {
  fill: none;
  stroke: #969086;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.edge-danger {
  stroke: var(--red);
  opacity: 0.68;
}

.edge-safe {
  stroke: var(--green);
  stroke-width: 1.7;
}

.edge-isolated {
  stroke: var(--amber);
}

.edge-reject {
  stroke: var(--red);
  opacity: 0.72;
}

.arrow-neutral {
  fill: #969086;
}

.arrow-safe {
  fill: var(--green);
}

.arrow-reject {
  fill: var(--red);
}

.arrow-internal {
  fill: var(--amber);
}

.edge-label,
.lane-label {
  font-family: var(--font-mono);
  font-size: 7px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.edge-label-safe {
  fill: var(--green);
}

.edge-label-reject {
  fill: var(--red);
}

.lane-label {
  fill: var(--amber);
}

.lane-rule {
  stroke: var(--line);
  stroke-width: 1;
}

.target-flow-diagram .node-reject-item {
  font-size: 9px;
}

.danger-dot {
  fill: var(--red);
}

.danger-x,
.check-icon {
  fill: white;
  font-size: 10px;
  font-weight: 700;
}

.check-dot {
  fill: var(--green);
}

.architecture-details {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 80px;
  margin-top: 70px;
}

.mini-heading {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.boundary-list,
.route-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.boundary-list {
  counter-reset: boundary;
}

.boundary-list li {
  counter-increment: boundary;
  position: relative;
  padding: 17px 0 17px 46px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
}

.boundary-list li::before {
  content: '0' counter(boundary);
  position: absolute;
  top: 18px;
  left: 0;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
}

.boundary-list strong {
  color: var(--ink);
}

.route-list {
  border-left: 1px solid var(--line-strong);
}

.route-list li {
  position: relative;
  padding: 15px 0 22px 24px;
}

.route-list li::before {
  content: '';
  position: absolute;
  top: 20px;
  left: -4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.route-meta {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
}

.route-list strong {
  display: block;
  font-size: 14px;
}

.route-list p {
  margin: 5px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
}

/* Evidence */
.evidence-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.65fr);
  gap: 36px;
  margin-top: 54px;
}

.deliverable-list {
  border-top: 1px solid var(--line-strong);
}

.deliverable {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 54px 16px;
  gap: 17px;
  align-items: center;
  padding: 19px 0;
  border-bottom: 1px solid var(--line-strong);
  text-decoration: none;
}

.deliverable:hover .deliverable-copy strong,
.deliverable:hover .external-mark {
  color: var(--accent);
}

.deliverable-number,
.deliverable-date {
  font-family: var(--font-mono);
  font-size: 11px;
}

.deliverable-number {
  color: var(--accent);
  font-weight: 600;
}

.deliverable-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 3px;
}

.deliverable-copy strong {
  font-size: 14px;
  line-height: 1.35;
  transition: color 150ms ease;
}

.deliverable-copy small {
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.45;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.deliverable-date {
  color: var(--muted);
  text-align: right;
}

.external-mark {
  color: var(--muted);
  transition: color 150ms ease;
}

.validation-note {
  align-self: start;
  padding: 25px;
  border-top: 4px solid #44b98c;
  background: #20332b;
  color: #f5f4ed;
}

.validation-note .note-label {
  color: #78d7b2;
}

.validation-note h3 {
  margin: 14px 0 11px;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.validation-note p {
  margin: 0;
  color: #c7d2cc;
  font-size: 12px;
}

.remaining-work {
  margin-top: 70px;
}

.remaining-work ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.remaining-work li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  padding: 18px 20px 18px 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.remaining-work li:nth-child(even) {
  padding-left: 20px;
  border-right: 0;
}

.remaining-work li span {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
}

/* Reflection */
.lesson-list {
  margin-top: 54px;
  border-top: 1px solid var(--line-strong);
}

.lesson {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 28px;
  padding: 31px 0;
  border-bottom: 1px solid var(--line-strong);
}

.lesson-number {
  padding-top: 4px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
}

.lesson h3 {
  margin: 0 0 9px;
  font-size: 19px;
  letter-spacing: -0.02em;
}

.lesson p {
  max-width: 790px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.personal-reflection {
  margin-top: 68px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.personal-reflection-header {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 30px;
  align-items: end;
  padding: 34px 0 30px;
  border-bottom: 1px solid var(--line);
}

.personal-reflection-header span,
.personal-reflection-prompt {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.personal-reflection-header h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1;
}

.personal-reflection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 64px;
}

.personal-reflection-item {
  padding: 33px 0 38px;
}

.personal-reflection-item + .personal-reflection-item {
  position: relative;
}

.personal-reflection-item + .personal-reflection-item::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -32px;
  width: 1px;
  background: var(--line);
  content: "";
}

.personal-reflection-prompt {
  margin: 0 0 18px;
}

.personal-reflection-item > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.8;
}

.closing-note {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 54px;
  padding: 27px 30px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}

.closing-note img {
  width: 52px;
  height: 52px;
}

.closing-note p {
  max-width: 760px;
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.36;
}

/* Footer */
.footer {
  padding: 58px 0 42px;
  background: var(--ink);
  color: #f2efe7;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 38px;
  align-items: start;
}

.footer-title,
.footer-subtitle,
.footer-note {
  margin: 0;
}

.footer-title {
  font-family: var(--font-display);
  font-size: 25px;
}

.footer-subtitle,
.footer-note {
  color: #9ca39d;
  font-size: 11px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: #d6d9d6;
  font-size: 11px;
  font-weight: 600;
  text-decoration-color: #636863;
  text-underline-offset: 4px;
}

.footer-links a:hover {
  color: #89c8d2;
}

.footer-note {
  grid-column: 1 / -1;
  padding-top: 28px;
  border-top: 1px solid #393d3a;
}

/* Progressive enhancement */
.reveal {
  opacity: 1;
  transform: none;
}

.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

:focus-visible {
  outline: 3px solid rgba(31, 107, 122, 0.5);
  outline-offset: 4px;
}

@media (max-width: 1050px) {
  .nav-inner {
    gap: 20px;
  }

  .nav-links {
    gap: 16px;
  }

  .hero-grid {
    column-gap: 55px;
  }

  .section-grid {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 34px;
  }

  .architecture-pair,
  .architecture-details {
    grid-template-columns: 1fr;
  }

  .architecture-details {
    gap: 52px;
  }

  .architecture-note {
    min-height: 0;
  }
}

@media (max-width: 820px) {
  .container {
    width: min(100% - 40px, 700px);
  }

  .nav-inner {
    width: calc(100% - 32px);
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding: 122px 0 44px;
    background: radial-gradient(circle at 92% 8%, rgba(36, 139, 197, 0.1), transparent 27%), var(--paper);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-meta {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 24px;
    padding-left: 0;
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .report-mark {
    align-items: flex-start;
    padding: 18px 0;
    border-bottom: 0;
  }

  .hero-facts {
    margin-top: 6px;
  }

  .hero-facts > div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .hero-facts > div:first-child {
    padding-left: 0;
  }

  .report-section {
    padding: 82px 0;
  }

  .section-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .section-rail {
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .section-number::after {
    content: '—';
    margin-left: 10px;
    color: var(--line-strong);
  }

  .lede-grid,
  .evidence-layout {
    grid-template-columns: 1fr;
  }

  .lede-grid {
    gap: 28px;
  }

  .version-ledger {
    grid-template-columns: 1fr;
  }

  .version-row {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .version-row:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 600px) {
  html {
    scroll-padding-top: 76px;
  }

  .container {
    width: calc(100% - 32px);
  }

  .nav-inner {
    height: 60px;
  }

  .nav-logo {
    font-size: 13px;
  }

  .nav-github {
    padding: 6px 9px;
    font-size: 10px;
  }

  .hero {
    padding-top: 104px;
  }

  .hero-title {
    font-size: clamp(48px, 15vw, 64px);
    letter-spacing: -0.06em;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 19px;
  }

  .hero-meta {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .report-mark {
    border-bottom: 1px solid var(--line);
  }

  .hero-facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-facts > div {
    padding: 14px 12px;
    border-bottom: 1px solid var(--line);
  }

  .hero-facts > div:nth-child(2) {
    border-right: 0;
  }

  .hero-facts > div:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .hero-facts > div:nth-child(3) {
    padding-left: 0;
  }

  .section-title {
    font-size: 42px;
  }

  .section-intro {
    font-size: 15px;
  }

  .phase-row {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .phase-index {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .phase-evidence > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .phase-open::before {
    left: -16px;
  }

  .architecture-panel {
    padding: 18px;
  }

  .architecture-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 7px;
  }

  .diagram-scroll svg {
    width: 500px;
    max-width: none;
  }

  .diagram-hint {
    display: flex;
    justify-content: space-between;
    margin: 14px 0 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }

  .deliverable {
    grid-template-columns: 48px minmax(0, 1fr) 14px;
  }

  .deliverable-date {
    display: none;
  }

  .deliverable-copy small {
    white-space: normal;
  }

  .remaining-work ul {
    grid-template-columns: 1fr;
  }

  .remaining-work li,
  .remaining-work li:nth-child(even) {
    padding: 16px 0;
    border-right: 0;
  }

  .lesson {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 12px;
  }

  .personal-reflection {
    margin-top: 52px;
  }

  .personal-reflection-header {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 28px 0 24px;
  }

  .personal-reflection-header h3 {
    font-size: 38px;
  }

  .personal-reflection-grid {
    grid-template-columns: 1fr;
  }

  .personal-reflection-item {
    padding: 26px 0 30px;
  }

  .personal-reflection-item + .personal-reflection-item {
    border-top: 1px solid var(--line);
  }

  .personal-reflection-item + .personal-reflection-item::before {
    display: none;
  }

  .closing-note {
    grid-template-columns: 1fr;
    padding: 23px;
  }

  .closing-note img {
    width: 42px;
    height: 42px;
  }

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

  .footer-links {
    flex-wrap: wrap;
  }

  .footer-note {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  body {
    background: white;
    color: black;
  }

  .site-accent,
  .nav,
  .hero-actions {
    display: none;
  }

  .hero,
  .report-section {
    padding-block: 38px;
  }

  .hero-grid,
  .section-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 58px;
  }

  .section-rail {
    position: static;
    flex-direction: row;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }

  a {
    text-decoration: none;
  }
}