@font-face {
  font-family: "Source Sans 3";
  src: url("assets/fonts/source-sans-3-latin.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "Source Serif 4";
  src: url("assets/fonts/source-serif-4-latin.woff2") format("woff2");
  font-display: swap;
}

:root {
  --bg: #f4f1e8;
  --surface: #fffdf8;
  --surface-soft: #e9f0ea;
  --surface-accent: #dce8df;
  --text: #14211e;
  --text-secondary: #4e5e59;
  --text-soft: #71807b;
  --line: #d5ddd7;
  --line-strong: #b6c6bd;
  --accent: #0d5945;
  --accent-dark: #073b2e;
  --accent-light: #e2eee7;
  --navy: #1c3a50;
  --warm: #a5653c;
  --radius-sm: 7px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-soft: 0 18px 52px rgba(17, 47, 38, 0.08);
  --content-width: min(1280px, calc(100vw - 64px));
  --nav-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 22px);
}

body {
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 100% 12rem no-repeat,
    var(--bg);
  font-family: "Source Sans 3", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(13, 89, 69, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(13, 89, 69, 0.025) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 72vh);
}

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

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--accent-dark);
}

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

:focus-visible {
  outline: 3px solid rgba(165, 101, 60, 0.75);
  outline-offset: 4px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 500;
  letter-spacing: -0.035em;
}

h2 {
  margin-bottom: 1.5rem;
  color: var(--accent-dark);
  font-size: clamp(2.1rem, 3.5vw, 3.45rem);
  line-height: 1.02;
}

h3 {
  line-height: 1.22;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  padding: 10px 16px;
  color: white;
  background: var(--accent-dark);
  transform: translateY(-150%);
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  min-height: var(--nav-height);
  padding: 0 max(32px, calc((100vw - 1280px) / 2));
  border-bottom: 1px solid rgba(182, 198, 189, 0.9);
  background: rgba(255, 253, 248, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  margin-right: auto;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.45rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.025em;
}

.site-nav {
  display: flex;
  align-items: stretch;
  gap: clamp(22px, 3vw, 44px);
  min-height: var(--nav-height);
}

.site-nav a {
  position: relative;
  display: grid;
  place-items: center;
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--warm);
  transform: scaleX(0);
  transition: transform 180ms ease;
}

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

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: transparent;
}

.nav-toggle span {
  display: block;
  height: 1px;
  margin: 6px 0;
  background: var(--accent-dark);
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(255px, 0.72fr) minmax(0, 2.28fr);
  gap: 26px 52px;
  width: var(--content-width);
  margin: 0 auto;
  padding: 52px 0 0;
}

.content-stack {
  display: contents;
}

.profile-sidebar {
  grid-column: 1;
  grid-row: 1;
  align-self: stretch;
  padding: 0 4px 30px 0;
  border-bottom: 1px solid var(--line-strong);
}

.portrait-slot {
  position: relative;
  aspect-ratio: 4 / 5;
  margin-bottom: 24px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--surface-soft);
}

.portrait-slot::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(255, 255, 255, 0.65);
  pointer-events: none;
}

.portrait-slot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.42);
  transform-origin: 72% 40%;
}

.profile-sidebar h1 {
  margin-bottom: 6px;
  color: var(--accent-dark);
  font-size: clamp(2.35rem, 3.4vw, 4rem);
  line-height: 0.98;
}

.profile-title {
  margin-bottom: 5px;
  color: var(--text);
  font-weight: 650;
}

.profile-affiliation,
.profile-bio {
  color: var(--text-secondary);
}

.profile-affiliation {
  margin-bottom: 20px;
  font-size: 0.93rem;
}

.profile-bio {
  max-width: 38ch;
  font-size: 0.96rem;
}

.profile-actions,
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.profile-actions {
  margin: 24px 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  font-weight: 650;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: white;
  background: var(--accent);
}

.button-primary:hover {
  color: white;
  background: var(--accent-dark);
}

.button-secondary {
  color: var(--accent-dark);
  background: transparent;
}

.profile-facts {
  display: grid;
  gap: 13px;
  margin: 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.profile-facts div {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 10px;
}

.profile-facts dt {
  color: var(--text-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.profile-facts dd {
  min-width: 0;
  margin: 0;
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

.section-block {
  grid-column: 1 / -1;
  padding: 82px 0;
  border-top: 1px solid var(--line-strong);
}

.hero-block {
  grid-column: 2;
  grid-row: 1;
  padding: 8px 0 30px;
  border-top: 0;
}

.hero-block h2 {
  max-width: 900px;
  margin-bottom: 24px;
  font-size: clamp(2.7rem, 5vw, 5.4rem);
  line-height: 0.96;
}

.lead {
  max-width: 72ch;
  margin-bottom: 24px;
  color: var(--text-secondary);
  font-size: clamp(1.04rem, 1.35vw, 1.2rem);
}

.hero-actions {
  margin-bottom: 36px;
}

.text-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  font-weight: 650;
}

.research-focus {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.research-focus article {
  position: relative;
  min-width: 0;
  padding: 24px 24px 22px 0;
}

.research-focus article + article {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.research-focus h3 {
  margin: 0 0 9px;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.18rem;
}

.research-focus p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.89rem;
  line-height: 1.52;
}

.key-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 26px 0 0;
  border: 1px solid var(--line-strong);
  background: rgba(233, 240, 234, 0.62);
}

.key-metrics div {
  display: flex;
  min-height: 92px;
  flex-direction: column-reverse;
  justify-content: center;
  padding: 15px 20px;
}

.key-metrics div + div {
  border-left: 1px solid var(--line-strong);
}

.key-metrics dt {
  color: var(--text-secondary);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.key-metrics dd {
  margin: 0 0 2px;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 2rem;
  line-height: 1;
}

#publications { order: 1; }
#projects { order: 2; }
#news { order: 3; }
#experience { order: 4; }
#education { order: 5; }
#skills { order: 6; }
#honors { order: 7; }
#contact { order: 8; }

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
}

.section-header h2 {
  margin-bottom: 0;
}

.publication-list {
  counter-reset: papers;
}

.publication {
  display: grid;
  grid-template-columns: 56px minmax(210px, 280px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.publication:last-child {
  border-bottom: 1px solid var(--line);
}

.publication-index {
  color: var(--warm);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.55rem;
  line-height: 1;
}

.publication-index::before {
  content: "0";
}

.publication-preview {
  display: grid;
  min-height: 160px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: border-color 160ms ease, transform 160ms ease;
}

.publication-preview:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.publication-preview img {
  width: 100%;
  max-height: 190px;
  object-fit: contain;
}

.publication-content h3 {
  max-width: 48ch;
  margin: 0 0 12px;
  color: var(--text);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(1.25rem, 1.9vw, 1.72rem);
  font-weight: 600;
}

.publication-content p {
  max-width: 78ch;
  margin-bottom: 14px;
  color: var(--text-secondary);
}

.publication-content a {
  overflow-wrap: anywhere;
}

.publication-content em {
  color: var(--navy);
}

.pub-meta,
.method-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.pub-meta span,
.method-tags span,
.project-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--accent-dark);
  background: var(--accent-light);
  font-size: 0.75rem;
  font-weight: 650;
  line-height: 1.2;
}

.pub-meta span:last-child {
  color: #75401f;
  border-color: #d9b493;
  background: #f5e8dc;
}

.project-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.project-row {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 360px;
  padding: 28px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 248, 0.76);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.project-row:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-soft);
  transform: translateY(-3px);
}

.project-label,
.entry-date {
  color: var(--warm);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.project-row h3 {
  max-width: 26ch;
  margin: 12px 0;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.5rem;
}

.project-row p {
  color: var(--text-secondary);
}

.project-badge {
  position: absolute;
  top: 24px;
  right: 24px;
  color: var(--text-secondary);
  background: var(--surface);
}

.project-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  margin: 22px 0 0;
}

.project-metrics div {
  min-width: 140px;
  flex: 1;
  padding: 12px 14px;
  background: var(--surface-soft);
}

.project-metrics dt {
  color: var(--text-soft);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.project-metrics dd {
  margin: 2px 0 0;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.25rem;
  font-weight: 600;
}

.news-list {
  max-width: 980px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.news-list li {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 28px;
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
}

.news-list time {
  color: var(--warm);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.2rem;
}

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

.entry {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 32px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.entry-title {
  display: flex;
  align-items: center;
  gap: 16px;
}

.entry-title img {
  width: 52px;
  height: 52px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: white;
  object-fit: contain;
}

.entry-title h3 {
  margin: 0;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.35rem;
}

.entry-role {
  margin: 8px 0 12px;
  color: var(--navy);
  font-weight: 600;
}

.compact-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-secondary);
}

#education {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 22px;
}

#education .section-header {
  grid-column: 1 / -1;
}

.featured-entry {
  display: block;
  padding: 26px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 248, 0.7);
}

.featured-entry .entry-date {
  margin-bottom: 14px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 18px;
  border-top: 1px solid var(--line);
}

.metric-grid div {
  padding: 14px 10px 0 0;
}

.metric-grid span,
.metric-grid strong {
  display: block;
}

.metric-grid span {
  color: var(--text-soft);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.metric-grid strong {
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.35rem;
}

.single-metric {
  grid-template-columns: 1fr;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.skill-grid article {
  padding: 24px 24px 20px 0;
}

.skill-grid article + article {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.skill-grid span {
  color: var(--accent-dark);
  font-weight: 700;
}

.skill-grid p {
  margin: 7px 0 0;
  color: var(--text-secondary);
}

.award-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.35fr 1fr;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.award-layout article {
  padding: 28px 26px 24px 0;
}

.award-layout article + article {
  padding-left: 26px;
  border-left: 1px solid var(--line);
}

.award-layout h3 {
  margin-bottom: 15px;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
}

.award-layout ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-secondary);
}

.award-layout li + li {
  margin-top: 9px;
}

.certificate-showcase {
  margin-top: 52px;
}

.certificate-showcase > h3 {
  margin-bottom: 20px;
  color: var(--accent-dark);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.7rem;
}

.certificate-wall {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.certificate-row,
.certificate-track {
  display: contents;
}

.certificate-card {
  display: grid;
  aspect-ratio: 4 / 3;
  min-width: 0;
  place-items: center;
  padding: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 253, 248, 0.85);
  transition: border-color 160ms ease, transform 160ms ease;
}

.certificate-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

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

.certificate-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.certificate-image-rotated {
  transform: rotate(90deg) scale(0.75);
}

.certificate-toggle {
  min-height: 46px;
  margin-top: 20px;
  padding: 10px 18px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--accent-dark);
  background: transparent;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

.certificate-toggle:hover {
  color: white;
  background: var(--accent);
}

.contact-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 60px;
  align-items: center;
  margin-bottom: 0;
  padding: 58px;
  border: 0;
  color: white;
  background: var(--accent-dark);
}

.contact-block h2 {
  max-width: 760px;
  margin-bottom: 12px;
  color: white;
}

.contact-block p {
  max-width: 68ch;
  margin-bottom: 0;
  color: #d6e5de;
}

.contact-block .button-primary {
  color: var(--accent-dark);
  border-color: white;
  background: white;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  width: var(--content-width);
  margin: 0 auto;
  padding: 30px 0 42px;
  color: var(--text-soft);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0;
}

/* Approved concept C: the same evidence becomes an asymmetric engineering dossier. */
html[data-layout="c"] body {
  background: var(--bg);
}

html[data-layout="c"] .topbar {
  padding-left: max(32px, calc((100vw - 1380px) / 2 + 360px));
}

html[data-layout="c"] .brand {
  font-family: "Source Sans 3", sans-serif;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

html[data-layout="c"] .page-layout {
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 0 44px;
  width: min(1380px, calc(100vw - 40px));
  padding-top: 0;
}

html[data-layout="c"] .content-stack {
  display: flex;
  min-width: 0;
  flex-direction: column;
  grid-column: 2;
  grid-row: 1;
}

html[data-layout="c"] .profile-sidebar {
  position: sticky;
  top: var(--nav-height);
  grid-column: 1;
  grid-row: 1;
  align-self: start;
  min-height: calc(100vh - var(--nav-height));
  padding: 34px 30px;
  color: white;
  border: 0;
  background: var(--accent-dark);
}

html[data-layout="c"] .portrait-slot {
  aspect-ratio: 1 / 0.9;
  margin-bottom: 22px;
  border-color: rgba(255, 255, 255, 0.35);
}

html[data-layout="c"] .profile-sidebar h1,
html[data-layout="c"] .profile-title,
html[data-layout="c"] .profile-sidebar a {
  color: white;
}

html[data-layout="c"] .profile-affiliation,
html[data-layout="c"] .profile-bio,
html[data-layout="c"] .profile-facts dt,
html[data-layout="c"] .profile-facts dd {
  color: #d5e3dc;
}

html[data-layout="c"] .profile-actions .button-primary {
  color: var(--accent-dark);
  border-color: white;
  background: white;
}

html[data-layout="c"] .profile-actions .button-secondary {
  border-color: #c08a66;
  background: var(--warm);
}

html[data-layout="c"] .profile-facts {
  border-color: rgba(255, 255, 255, 0.2);
}

html[data-layout="c"] .section-block {
  width: 100%;
}

html[data-layout="c"] .hero-block {
  order: 0;
  padding-top: 60px;
}

html[data-layout="c"] .hero-block h2 {
  max-width: 1000px;
  font-size: clamp(2.7rem, 4.8vw, 5rem);
}

html[data-layout="c"] .publication {
  grid-template-columns: 44px minmax(190px, 240px) minmax(0, 1fr);
  gap: 18px;
}

html[data-layout="c"] .project-list {
  grid-template-columns: 1fr;
}

html[data-layout="c"] .project-row {
  min-height: 0;
  grid-template-columns: 175px minmax(0, 1fr);
}

html[data-layout="c"] #education,
html[data-layout="c"] .award-layout {
  grid-template-columns: 1fr;
}

html[data-layout="c"] .featured-entry + .featured-entry,
html[data-layout="c"] .award-layout article + article {
  border-left: 0;
  border-top: 1px solid var(--line);
}

html[data-layout="c"] .certificate-wall {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

html[data-layout="c"] .contact-block {
  margin-bottom: 40px;
}

@media (max-width: 1100px) {
  :root {
    --content-width: min(100% - 40px, 1040px);
  }

  .page-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 28px;
  }

  .hero-block h2 {
    font-size: clamp(2.6rem, 5vw, 4.3rem);
  }

  .research-focus {
    grid-template-columns: 1fr;
  }

  .research-focus article + article {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

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

  .key-metrics div:nth-child(3) {
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .key-metrics div:nth-child(4) {
    border-top: 1px solid var(--line-strong);
  }

  .publication {
    grid-template-columns: 44px 220px minmax(0, 1fr);
    gap: 18px;
  }

  .award-layout {
    grid-template-columns: 1fr;
  }

  .award-layout article + article {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  html[data-layout="c"] .topbar {
    padding-left: 24px;
  }

  html[data-layout="c"] .page-layout {
    grid-template-columns: 270px minmax(0, 1fr);
    gap: 28px;
  }

  html[data-layout="c"] .publication {
    grid-template-columns: 42px minmax(0, 1fr);
  }

  html[data-layout="c"] .publication-preview {
    grid-column: 2;
  }

  html[data-layout="c"] .publication-content {
    grid-column: 2;
  }
}

@media (max-width: 900px) {
  :root {
    --nav-height: 64px;
  }

  .topbar {
    padding: 0 20px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 16px;
    left: 16px;
    display: none;
    min-height: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow-soft);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    min-height: 48px;
    justify-content: flex-start;
    padding: 0 14px;
  }

  .site-nav a::after {
    right: auto;
    width: 28px;
  }

  .page-layout,
  html[data-layout="c"] .page-layout {
    display: block;
    width: var(--content-width);
    padding-top: 36px;
  }

  .content-stack,
  html[data-layout="c"] .content-stack {
    display: flex;
    flex-direction: column;
  }

  .profile-sidebar,
  html[data-layout="c"] .profile-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 0 28px;
    min-height: 0;
    padding: 24px;
    border: 1px solid var(--line-strong);
    background: var(--surface-soft);
  }

  html[data-layout="c"] .profile-sidebar {
    color: var(--text);
    background: var(--accent-dark);
  }

  .portrait-slot,
  html[data-layout="c"] .portrait-slot {
    grid-row: 1 / span 7;
    aspect-ratio: 4 / 5;
    margin: 0;
  }

  .profile-sidebar h1 {
    align-self: end;
  }

  .profile-actions {
    margin: 15px 0;
  }

  .profile-facts {
    padding-top: 14px;
  }

  .hero-block,
  html[data-layout="c"] .hero-block {
    padding-top: 56px;
  }

  .project-list {
    grid-template-columns: 1fr;
  }

  .project-row,
  html[data-layout="c"] .project-row {
    display: block;
    min-height: 0;
  }

  .publication,
  html[data-layout="c"] .publication {
    grid-template-columns: 42px minmax(0, 1fr);
  }

  .publication-preview,
  html[data-layout="c"] .publication-preview,
  .publication-content,
  html[data-layout="c"] .publication-content {
    grid-column: 2;
  }

  #education {
    grid-template-columns: 1fr;
  }

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

  .skill-grid article + article {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .certificate-wall,
  html[data-layout="c"] .certificate-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-block {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 600px) {
  :root {
    --content-width: calc(100% - 28px);
  }

  body {
    font-size: 16px;
  }

  .brand {
    font-size: 1.2rem;
  }

  .page-layout,
  html[data-layout="c"] .page-layout {
    padding-top: 20px;
  }

  .profile-sidebar,
  html[data-layout="c"] .profile-sidebar {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 0 18px;
    padding: 18px;
  }

  .portrait-slot,
  html[data-layout="c"] .portrait-slot {
    grid-row: 1 / span 3;
    aspect-ratio: 1;
  }

  .profile-sidebar h1 {
    margin: 0;
    font-size: clamp(2rem, 10vw, 2.8rem);
  }

  .profile-title,
  .profile-affiliation {
    margin-bottom: 4px;
    line-height: 1.3;
  }

  .profile-bio,
  .profile-actions,
  .profile-facts {
    grid-column: 1 / -1;
  }

  .profile-bio {
    margin-top: 18px;
  }

  .profile-actions .button {
    flex: 1;
  }

  html[data-layout="c"] .profile-sidebar {
    grid-template-columns: minmax(0, 1fr) 96px;
  }

  html[data-layout="c"] .portrait-slot {
    grid-column: 2;
    grid-row: 1 / span 3;
    width: 96px;
    height: 118px;
  }

  html[data-layout="c"] .profile-sidebar h1,
  html[data-layout="c"] .profile-title,
  html[data-layout="c"] .profile-affiliation {
    grid-column: 1;
    padding-right: 12px;
  }

  html[data-layout="c"] .profile-sidebar h1 {
    align-self: end;
  }

  .hero-block h2,
  html[data-layout="c"] .hero-block h2 {
    font-size: clamp(2.15rem, 10.5vw, 3rem);
    line-height: 1;
  }

  .section-block {
    padding: 54px 0;
  }

  .hero-block {
    padding-top: 48px;
  }

  .research-focus article {
    padding: 20px 0;
  }

  .key-metrics div {
    min-height: 98px;
    padding: 12px;
  }

  .key-metrics dd {
    font-size: 1.55rem;
  }

  .section-header {
    display: block;
  }

  .section-header .text-link {
    margin-top: 8px;
  }

  .publication,
  html[data-layout="c"] .publication {
    display: block;
    padding: 28px 0;
  }

  .publication-index {
    display: block;
    margin-bottom: 12px;
  }

  .publication-preview {
    width: 100%;
    margin-bottom: 20px;
  }

  .publication-content h3 {
    font-size: 1.35rem;
  }

  .project-row {
    padding: 22px;
  }

  .project-badge {
    position: static;
    margin-top: 18px;
  }

  .news-list li,
  .entry {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .featured-entry {
    padding: 20px;
  }

  .entry-title {
    align-items: flex-start;
  }

  .entry-title h3 {
    overflow-wrap: anywhere;
  }

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

  .award-layout article {
    padding: 24px 0;
  }

  .certificate-wall,
  html[data-layout="c"] .certificate-wall {
    grid-template-columns: 1fr;
  }

  .certificate-toggle,
  .contact-block .button {
    width: 100%;
  }

  .contact-block {
    padding: 32px 22px;
  }

  .site-footer {
    display: block;
  }

  .site-footer p + p {
    margin-top: 6px;
  }
}

/* Final A+C hybrid: A's broad research narrative with C's identity dossier. */
html[data-layout="hybrid"] .page-layout {
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 2.18fr);
  gap: 28px 48px;
}

html[data-layout="hybrid"] .profile-sidebar {
  align-self: stretch;
  padding: 30px;
  color: white;
  border: 0;
  background: var(--accent-dark);
}

html[data-layout="hybrid"] .portrait-slot {
  aspect-ratio: 4 / 4.6;
  border-color: rgba(255, 255, 255, 0.34);
}

html[data-layout="hybrid"] .profile-sidebar h1,
html[data-layout="hybrid"] .profile-title,
html[data-layout="hybrid"] .profile-sidebar a {
  color: white;
}

html[data-layout="hybrid"] .profile-affiliation,
html[data-layout="hybrid"] .profile-bio,
html[data-layout="hybrid"] .profile-facts dt,
html[data-layout="hybrid"] .profile-facts dd {
  color: #d5e3dc;
}

html[data-layout="hybrid"] .profile-actions .button-primary {
  color: var(--accent-dark);
  border-color: white;
  background: white;
}

html[data-layout="hybrid"] .profile-actions .button-secondary {
  color: white;
  border-color: #c08a66;
  background: var(--warm);
}

html[data-layout="hybrid"] .profile-facts {
  border-color: rgba(255, 255, 255, 0.2);
}

/* Preserve the current edition's content sequence. */
html[data-layout="hybrid"] #education { order: 1; }
html[data-layout="hybrid"] #skills { order: 2; }
html[data-layout="hybrid"] #news { order: 3; }
html[data-layout="hybrid"] #experience { order: 4; }
html[data-layout="hybrid"] #publications { order: 5; }
html[data-layout="hybrid"] #projects { order: 6; }
html[data-layout="hybrid"] #honors { order: 7; }
html[data-layout="hybrid"] #contact { order: 8; }

@media (max-width: 1100px) and (min-width: 901px) {
  html[data-layout="hybrid"] .page-layout {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 30px;
  }

  html[data-layout="hybrid"] .profile-sidebar {
    padding: 24px;
  }
}

@media (max-width: 900px) {
  html[data-layout="hybrid"] .page-layout {
    display: block;
  }

  html[data-layout="hybrid"] .profile-sidebar {
    padding: 24px;
    color: white;
    border: 0;
    background: var(--accent-dark);
  }

  html[data-layout="hybrid"] .portrait-slot {
    aspect-ratio: 4 / 5;
  }
}

@media (max-width: 600px) {
  html[data-layout="hybrid"] .profile-sidebar {
    grid-template-columns: minmax(0, 1fr) 96px;
    gap: 0 16px;
    padding: 18px;
  }

  html[data-layout="hybrid"] .portrait-slot {
    grid-column: 2;
    grid-row: 1 / span 3;
    width: 96px;
    height: 118px;
    aspect-ratio: auto;
  }

  html[data-layout="hybrid"] .profile-sidebar h1,
  html[data-layout="hybrid"] .profile-title,
  html[data-layout="hybrid"] .profile-affiliation {
    grid-column: 1;
    padding-right: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}