:root {
  --ink: #162326;
  --muted: #5d6a6d;
  --paper: #f7f8f5;
  --surface: #ffffff;
  --line: #d9dfdc;
  --line-strong: #b8c3bf;
  --teal: #0d6b67;
  --teal-dark: #084d4a;
  --blue: #2559a7;
  --red: #b43c35;
  --amber: #a66b13;
  --green: #277447;
  --violet: #6955a0;
  --black: #0c1213;
  --max: 1240px;
  --radius: 6px;
  --shadow: 0 18px 55px rgba(18, 35, 38, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

body.menu-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
figure,
blockquote {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.16;
  letter-spacing: 0;
}

h1,
h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
}

h3,
h4 {
  font-weight: 700;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: #fff;
  background: var(--black);
  transform: translateY(-150%);
}

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

.scroll-progress {
  position: fixed;
  z-index: 900;
  inset: 0 auto auto 0;
  width: 0;
  height: 3px;
  background: var(--teal);
}

.site-header {
  position: sticky;
  z-index: 800;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 10px max(24px, calc((100% - var(--max)) / 2));
  border-bottom: 1px solid rgba(184, 195, 191, 0.7);
  background: rgba(247, 248, 245, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid var(--ink);
  color: var(--surface);
  background: var(--ink);
  font-weight: 800;
}

.brand-copy {
  display: grid;
  line-height: 1.15;
}

.brand-copy strong {
  font-size: 0.95rem;
}

.brand-copy small {
  color: var(--muted);
  font-size: 0.74rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  padding: 9px 12px;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  border-bottom-color: var(--teal);
  color: var(--ink);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  padding: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
}

.menu-button span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.container {
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--teal);
  font-size: 0.77rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.home-hero {
  position: relative;
  min-height: calc(88vh - 72px);
  padding: 76px 0 52px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(rgba(247, 248, 245, 0.96), rgba(247, 248, 245, 0.9)),
    url("images/p3-cutoff-tradeoff.png") center / cover no-repeat;
}

.home-hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34%;
  height: 5px;
  background: var(--red);
  content: "";
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 930px;
}

.hero-title {
  max-width: 900px;
  margin-bottom: 24px;
  font-size: clamp(3rem, 6vw, 5.8rem);
}

.hero-lede {
  max-width: 780px;
  margin-bottom: 30px;
  color: #354548;
  font-size: 1.18rem;
}

.hero-actions,
.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--ink);
  background: var(--surface);
  font-size: 0.92rem;
  font-weight: 750;
  text-decoration: none;
}

.button:hover,
.button:focus-visible {
  border-color: var(--teal);
  color: var(--teal-dark);
}

.button.primary {
  border-color: var(--teal-dark);
  color: #fff;
  background: var(--teal-dark);
}

.button.primary:hover,
.button.primary:focus-visible {
  background: var(--teal);
}

.hero-proof {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 980px;
  margin-top: 60px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.hero-proof div {
  padding: 20px 18px 18px 0;
}

.hero-proof div + div {
  padding-left: 18px;
  border-left: 1px solid var(--line-strong);
}

.hero-proof strong {
  display: block;
  margin-bottom: 4px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.75rem;
}

.hero-proof span {
  color: var(--muted);
  font-size: 0.8rem;
}

.band {
  padding: 76px 0;
  border-bottom: 1px solid var(--line);
}

.band.surface {
  background: var(--surface);
}

.band.dark {
  color: #f4f7f5;
  background: var(--ink);
}

.band.dark .eyebrow {
  color: #79c5bf;
}

.band.dark .section-intro,
.band.dark .muted {
  color: #b9c6c5;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 34px;
}

.section-head h2 {
  max-width: 720px;
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.section-intro {
  max-width: 610px;
  margin-bottom: 0;
  color: var(--muted);
}

.architecture-grid {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: 46px;
  align-items: start;
}

.data-pool {
  position: sticky;
  top: 104px;
  padding: 26px;
  border: 1px solid var(--line-strong);
  border-top: 5px solid var(--teal);
  background: var(--surface);
}

.data-pool h3 {
  margin-bottom: 10px;
  font-size: 1.5rem;
}

.data-pool-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  background: var(--line);
}

.data-pool-metrics div {
  padding: 14px;
  background: var(--paper);
}

.data-pool-metrics strong,
.data-pool-metrics span {
  display: block;
}

.data-pool-metrics span {
  color: var(--muted);
  font-size: 0.75rem;
}

.independent-projects {
  display: grid;
  gap: 12px;
}

.architecture-item {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  gap: 18px;
  align-items: center;
  min-height: 94px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.architecture-item .num {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  color: #fff;
  background: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
}

.architecture-item h3 {
  margin-bottom: 4px;
  font-size: 1.05rem;
}

.architecture-item p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.architecture-item a {
  color: var(--teal-dark);
  font-size: 0.85rem;
  font-weight: 750;
  text-decoration: none;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 8px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
}

.status.complete,
.status.pass {
  color: var(--green);
  background: #edf7f0;
}

.status.pending,
.status.amber {
  color: var(--amber);
  background: #fff7e8;
}

.status.red {
  color: var(--red);
  background: #fff0ee;
}

.status.info {
  color: var(--blue);
  background: #edf3ff;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.filter-button {
  min-height: 38px;
  padding: 7px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--muted);
  background: var(--surface);
  cursor: pointer;
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button.active {
  border-color: var(--ink);
  color: #fff;
  background: var(--ink);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.project-card {
  position: relative;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: 400px;
  padding: 26px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.project-card::before {
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 4px;
  background: var(--accent, var(--teal));
  content: "";
}

.project-card[hidden] {
  display: none;
}

.project-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 36px;
}

.project-index {
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.8rem;
}

.project-card h3 {
  max-width: 520px;
  margin-bottom: 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.65rem;
}

.project-card > p {
  color: var(--muted);
}

.card-evidence {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 20px 0 24px;
}

.card-evidence div {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.card-evidence strong,
.card-evidence span {
  display: block;
}

.card-evidence strong {
  font-size: 1.05rem;
}

.card-evidence span {
  color: var(--muted);
  font-size: 0.7rem;
}

.text-link {
  align-self: end;
  width: fit-content;
  color: var(--teal-dark);
  font-weight: 800;
  text-decoration: none;
}

.text-link:hover,
.text-link:focus-visible {
  text-decoration: underline;
}

.capability-table-wrap,
.result-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--surface);
}

.capability-table,
.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.capability-table th,
.capability-table td,
.result-table th,
.result-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.capability-table th,
.result-table th {
  color: #fff;
  background: var(--ink);
  font-size: 0.74rem;
}

.capability-table tbody tr:last-child td,
.result-table tbody tr:last-child td {
  border-bottom: 0;
}

.capability-table tbody tr:hover,
.result-table tbody tr:hover {
  background: #f2f6f4;
}

.evidence-ledger {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: #405155;
}

.evidence-ledger article {
  min-height: 184px;
  padding: 24px;
  background: var(--ink);
}

.evidence-ledger strong {
  display: block;
  margin-bottom: 8px;
  color: #fff;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
}

.evidence-ledger span {
  display: block;
  color: #aebcba;
  font-size: 0.78rem;
}

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

.boundary-grid article {
  padding: 22px 0;
  border-top: 3px solid var(--line-strong);
}

.boundary-grid h3 {
  margin-bottom: 8px;
  font-size: 1rem;
}

.boundary-grid p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer {
  padding: 38px 0;
  color: #dfe7e5;
  background: var(--black);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(280px, 1.5fr) minmax(220px, 1fr) auto;
  align-items: start;
  justify-content: space-between;
  gap: 36px;
}

.footer-inner p {
  max-width: 600px;
  margin: 6px 0 0;
  color: #9fadaa;
  font-size: 0.82rem;
}

.footer-contact {
  display: grid;
  gap: 6px;
  margin: 0;
  color: #dfe7e5;
  font-style: normal;
}

.footer-contact-label {
  margin-bottom: 2px;
  color: #8fd0c8;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-contact a {
  width: fit-content;
  color: #b8c6c3;
  font-size: 0.82rem;
  text-decoration: none;
}

.footer-contact a:hover,
.footer-contact a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links a {
  color: #dfe7e5;
  font-size: 0.82rem;
}

/* Project pages */
.project-hero {
  --project-accent: var(--teal);
  position: relative;
  padding: 68px 0 46px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.project-hero::before {
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: var(--project-accent);
  content: "";
}

.project-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.project-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.project-kicker .eyebrow {
  margin: 0;
  color: var(--project-accent);
}

.project-hero h1 {
  max-width: 980px;
  margin-bottom: 18px;
  font-size: clamp(2.6rem, 5vw, 5rem);
}

.project-thesis {
  max-width: 900px;
  margin-bottom: 18px;
  color: #304145;
  font-size: 1.14rem;
}

.vn-summary {
  max-width: 900px;
  margin: 28px 0 0;
  padding: 18px 20px;
  border-left: 4px solid var(--project-accent);
  background: var(--paper);
}

.vn-summary strong {
  display: block;
  margin-bottom: 4px;
  font-size: 0.78rem;
  text-transform: uppercase;
}

.vn-summary p {
  margin: 0;
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 22px;
}

.tag {
  padding: 5px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-size: 0.72rem;
  font-weight: 700;
}

.metric-rail {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
  background: var(--ink);
}

.metric-rail article {
  min-height: 136px;
  padding: 22px;
  border-right: 1px solid #405155;
}

.metric-rail article:last-child {
  border-right: 0;
}

.metric-rail strong {
  display: block;
  margin-bottom: 6px;
  color: #fff;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.7rem;
}

.metric-rail span {
  display: block;
  color: #b7c3c1;
  font-size: 0.75rem;
}

.project-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 48px;
  width: min(calc(100% - 48px), var(--max));
  margin: 0 auto;
  padding: 56px 0 84px;
}

.project-toc {
  position: sticky;
  top: 96px;
  align-self: start;
}

.project-toc strong {
  display: block;
  margin-bottom: 12px;
  font-size: 0.73rem;
  text-transform: uppercase;
}

.project-toc nav {
  display: grid;
  border-left: 1px solid var(--line-strong);
}

.project-toc a {
  padding: 7px 0 7px 14px;
  color: var(--muted);
  font-size: 0.78rem;
  text-decoration: none;
}

.project-toc a:hover,
.project-toc a:focus-visible {
  color: var(--teal-dark);
}

.project-main {
  min-width: 0;
}

.project-section {
  padding: 0 0 58px;
  scroll-margin-top: 96px;
}

.project-section + .project-section {
  padding-top: 58px;
  border-top: 1px solid var(--line);
}

.project-section h2 {
  max-width: 760px;
  margin-bottom: 20px;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
}

.project-section .lead {
  max-width: 810px;
  color: #354548;
  font-size: 1.05rem;
}

.decision-question {
  margin: 26px 0;
  padding: 24px 26px;
  border-left: 5px solid var(--project-accent, var(--teal));
  background: var(--surface);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
}

.three-up,
.data-layer-grid,
.formula-grid,
.validation-grid,
.employer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.info-block,
.data-layer,
.formula-card,
.validation-card,
.employer-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.info-block h3,
.data-layer h3,
.formula-card h3,
.validation-card h3,
.employer-card h3 {
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.info-block p,
.data-layer p,
.formula-card p,
.validation-card p,
.employer-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.data-layer .layer-meta {
  display: block;
  margin-bottom: 8px;
  color: var(--project-accent, var(--teal));
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
}

.formula-card code {
  display: block;
  margin: 14px 0;
  padding: 12px;
  overflow-wrap: anywhere;
  border-left: 3px solid var(--project-accent, var(--teal));
  color: var(--ink);
  background: var(--paper);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.76rem;
  white-space: normal;
}

.formula-use {
  display: block;
  margin-top: 10px;
  color: var(--project-accent, var(--teal));
  font-size: 0.73rem;
  font-weight: 750;
}

.inline-label {
  color: inherit;
  font: inherit;
  font-weight: 800;
}

.process-list {
  position: relative;
  display: grid;
  gap: 0;
  margin-top: 28px;
}

.process-step {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 20px;
  min-height: 126px;
  padding-bottom: 28px;
}

.process-step:last-child {
  min-height: 0;
  padding-bottom: 0;
}

.step-number {
  position: relative;
  z-index: 1;
  display: grid;
  width: 50px;
  height: 50px;
  place-items: center;
  border: 1px solid var(--project-accent, var(--teal));
  border-radius: 50%;
  color: #fff;
  background: var(--project-accent, var(--teal));
  font-weight: 800;
}

.process-step:not(:last-child) .step-number::after {
  position: absolute;
  z-index: -1;
  top: 49px;
  left: 24px;
  width: 1px;
  height: 76px;
  background: var(--line-strong);
  content: "";
}

.process-copy h3 {
  margin-bottom: 6px;
  font-size: 1rem;
}

.process-copy p {
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.88rem;
}

.process-copy small {
  color: var(--project-accent, var(--teal));
  font-size: 0.73rem;
  font-weight: 750;
}

.decision-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1px;
  margin-top: 28px;
  color: #f2f5f4;
  background: #405155;
}

.decision-panel > div {
  padding: 28px;
  background: var(--ink);
}

.decision-panel h3 {
  color: #fff;
}

.decision-panel p {
  margin-bottom: 0;
  color: #bdc8c6;
}

.decision-panel .recommendation {
  background: var(--teal-dark);
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.chart-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.chart-button {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.chart-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  background: #fff;
}

.chart-card figcaption {
  padding: 13px 15px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.alert-list,
.artifact-list {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}

.alert-list li {
  padding: 14px 16px;
  border-left: 4px solid var(--red);
  background: #fff2ef;
}

.alert-list li.amber {
  border-left-color: var(--amber);
  background: #fff8e9;
}

.alert-list li.info {
  border-left-color: var(--blue);
  background: #eef4ff;
}

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

.artifact-list a {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  min-height: 76px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--surface);
  text-decoration: none;
}

.artifact-list a:hover,
.artifact-list a:focus-visible {
  border-color: var(--project-accent, var(--teal));
}

.artifact-list strong,
.artifact-list small {
  display: block;
}

.artifact-list small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.72rem;
}

.artifact-type {
  color: var(--project-accent, var(--teal));
  font-size: 0.67rem;
  font-weight: 800;
  text-transform: uppercase;
}

.project-next {
  padding: 46px 0;
  color: #fff;
  background: var(--project-accent, var(--teal-dark));
}

.project-next-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
}

.project-next h2 {
  margin-bottom: 6px;
  font-size: 2rem;
}

.project-next p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.78);
}

.project-next .button {
  flex: 0 0 auto;
}

.image-dialog {
  width: min(94vw, 1240px);
  max-height: 94vh;
  padding: 0;
  border: 0;
  background: #fff;
  box-shadow: var(--shadow);
}

.image-dialog::backdrop {
  background: rgba(5, 12, 13, 0.78);
}

.image-dialog img {
  width: 100%;
  max-height: 86vh;
  object-fit: contain;
}

.dialog-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 42px;
  height: 42px;
  border: 1px solid #fff;
  border-radius: 4px;
  color: #fff;
  background: var(--black);
  cursor: pointer;
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1000px) {
  .site-nav {
    position: fixed;
    inset: 72px 0 auto 0;
    display: none;
    padding: 12px 24px 24px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
  }

  .site-nav.open {
    display: grid;
  }

  .menu-button {
    display: block;
  }

  .architecture-grid,
  .project-shell {
    grid-template-columns: 1fr;
  }

  .data-pool,
  .project-toc {
    position: static;
  }

  .project-toc nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border: 1px solid var(--line);
  }

  .project-toc a {
    padding: 9px;
    border-right: 1px solid var(--line);
    text-align: center;
  }

  .metric-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .metric-rail article:nth-child(3) {
    border-right: 0;
  }

  .metric-rail article:nth-child(n + 4) {
    border-top: 1px solid #405155;
  }

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

@media (max-width: 760px) {
  .container,
  .project-shell {
    width: min(calc(100% - 32px), var(--max));
  }

  .brand-copy small {
    display: none;
  }

  .home-hero {
    min-height: auto;
    padding: 52px 0 38px;
  }

  .hero-title {
    font-size: 3rem;
  }

  .hero-proof,
  .project-grid,
  .boundary-grid,
  .three-up,
  .data-layer-grid,
  .formula-grid,
  .validation-grid,
  .employer-grid,
  .chart-grid,
  .artifact-list,
  .decision-panel {
    grid-template-columns: 1fr;
  }

  .hero-proof div + div {
    padding-left: 0;
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .section-head,
  .footer-inner,
  .project-next-inner {
    align-items: start;
    flex-direction: column;
  }

  .footer-inner {
    display: flex;
  }

  .project-card {
    min-height: 0;
  }

  .architecture-item {
    grid-template-columns: 48px 1fr;
  }

  .architecture-item a {
    grid-column: 2;
  }

  .project-hero-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

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

  .metric-rail article,
  .metric-rail article:nth-child(3) {
    border-top: 1px solid #405155;
    border-right: 1px solid #405155;
  }

  .metric-rail article:nth-child(even) {
    border-right: 0;
  }

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

  .project-section {
    padding-bottom: 42px;
  }

  .project-section + .project-section {
    padding-top: 42px;
  }

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

/* Vietnamese typography uses a native UI font with complete precomposed
   Vietnamese glyph coverage. This avoids detached diacritics in Georgia on
   Windows while preserving the English editorial typography. */
html[lang="vi"] body,
html[lang="vi"] h1,
html[lang="vi"] h2,
html[lang="vi"] h3,
html[lang="vi"] h4,
html[lang="vi"] .hero-title,
html[lang="vi"] .brand-copy strong,
html[lang="vi"] .decision-question,
html[lang="vi"] .project-card h3 {
  font-family: "Segoe UI", Arial, sans-serif;
  font-variant-ligatures: none;
  letter-spacing: 0;
  word-break: normal;
  overflow-wrap: break-word;
}

html[lang="vi"] h1,
html[lang="vi"] h2,
html[lang="vi"] h3,
html[lang="vi"] h4 {
  font-weight: 750;
}

@media (max-width: 440px) {
  .hero-title,
  .project-hero h1 {
    font-size: 2.55rem;
  }

  .card-evidence,
  .data-pool-metrics,
  .metric-rail {
    grid-template-columns: 1fr;
  }

  .metric-rail article {
    border-right: 0;
  }
}

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

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

@media print {
  .site-header,
  .scroll-progress,
  .project-toc,
  .project-next,
  .menu-button,
  .image-dialog {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .project-shell {
    display: block;
    width: 100%;
    padding: 24px;
  }

  .project-section {
    break-inside: avoid;
  }
}