:root {
  --paper: #f5efe3;
  --paper-2: #efe5d5;
  --paper-3: #e4d6c0;
  --ink: #1d1a16;
  --muted: #6a645c;
  --line: rgba(29, 26, 22, 0.12);
  --line-strong: rgba(29, 26, 22, 0.22);
  --accent: #9d4f2f;
  --accent-soft: rgba(157, 79, 47, 0.12);
  --teal: #1d6e6d;
  --teal-soft: rgba(29, 110, 109, 0.12);
  --gold: #c1974e;
  --card: rgba(255, 252, 246, 0.78);
  --shadow: 0 24px 70px rgba(84, 62, 41, 0.12);
  --max: 1180px;
  --serif: "Cormorant Garamond", "Noto Serif SC", serif;
  --sans: "Space Grotesk", "Noto Sans SC", sans-serif;
  --mono: "IBM Plex Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(circle at top right, rgba(157, 79, 47, 0.14), transparent 28%),
    radial-gradient(circle at left 30%, rgba(29, 110, 109, 0.12), transparent 22%),
    linear-gradient(180deg, #f8f3ea 0%, #f5efe3 100%);
  color: var(--ink);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.site-shell {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(248, 243, 234, 0.8);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: 24px;
  background: linear-gradient(145deg, rgba(157, 79, 47, 0.16), rgba(29, 110, 109, 0.16));
  border: 1px solid rgba(157, 79, 47, 0.14);
}

.brand-copy strong {
  display: block;
  font-size: 15px;
  letter-spacing: 0.03em;
}

.brand-copy span {
  display: block;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  font-size: 13px;
  color: var(--muted);
  transition: color 0.2s ease, transform 0.2s ease;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.lang-switch button {
  border: 0;
  min-width: 46px;
  height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.lang-switch button.is-active {
  background: var(--ink);
  color: #f8f3ea;
}

.lang {
  display: none;
}

html[lang="en"] .lang-en,
html[lang="zh-CN"] .lang-zh {
  display: inline;
}

html[lang="en"] .lang-block.lang-en,
html[lang="zh-CN"] .lang-block.lang-zh {
  display: block;
}

html[lang="en"] .lang-flex.lang-en,
html[lang="zh-CN"] .lang-flex.lang-zh {
  display: flex;
}

html[lang="en"] .lang-inline-flex.lang-en,
html[lang="zh-CN"] .lang-inline-flex.lang-zh {
  display: inline-flex;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  transform: translateY(-1px);
}

.nav-cta {
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--ink);
  color: #f8f3ea;
}

.page {
  padding-bottom: 96px;
}

.hero {
  padding: 72px 0 36px;
}

.hero-panel,
.panel {
  position: relative;
  overflow: hidden;
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow);
}

.hero-panel {
  border-radius: 34px;
  padding: clamp(28px, 5vw, 64px);
}

.hero-panel::before,
.panel::before {
  content: "";
  position: absolute;
  inset: auto auto -110px -70px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(29, 110, 109, 0.15), transparent 70%);
  pointer-events: none;
}

.hero-grid,
.two-col,
.three-col {
  display: grid;
  gap: 26px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: start;
}

.eyebrow {
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1,
.section-head h2,
.panel h3,
.paper-title {
  margin: 0;
  font-family: var(--serif);
  line-height: 0.95;
  letter-spacing: -0.02em;
}

.hero h1 {
  font-size: clamp(52px, 9vw, 102px);
  margin-bottom: 20px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.hero-copy > p {
  max-width: 62ch;
}

.hero-lead {
  font-size: clamp(21px, 2.3vw, 30px);
  line-height: 1.34;
  color: var(--ink);
  max-width: 23ch;
  margin-bottom: 10px;
}

.hero-support {
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
}

.hero-abstract-box {
  margin-top: 22px;
  padding: 18px 20px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.42);
}

.hero-proof-note {
  margin-top: 14px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(29, 26, 22, 0.03);
  border: 1px dashed rgba(29, 26, 22, 0.14);
}

.hero-proof-note p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
}

.hero-abstract-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.hero-kernel {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(157, 79, 47, 0.16);
}

.hero-abstract-list {
  display: grid;
  gap: 10px;
}

.hero-abstract-item {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-top: 10px;
  border-top: 1px solid rgba(29, 26, 22, 0.08);
}

.hero-abstract-item:first-child {
  padding-top: 0;
  border-top: 0;
}

.hero-abstract-key {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-abstract-value {
  color: var(--ink);
  font-size: 15px;
}

.hero-copy p,
.section-head p,
.body-copy,
.metric p,
.card p,
.axiom-card p,
.list-card p,
.timeline-item p,
.author-note p {
  color: var(--muted);
  font-size: 16px;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-actions-muted {
  margin-top: 22px;
  gap: 14px 18px;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(157, 79, 47, 0.24);
}

.hero-link:hover {
  color: var(--ink);
  border-bottom-color: rgba(29, 26, 22, 0.28);
}

.button,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  font-size: 14px;
}

.button {
  background: var(--ink);
  color: #f8f3ea;
}

.button-secondary {
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.45);
}

.equation-box,
.stat-card,
.card,
.axiom-card,
.list-card,
.timeline-item,
.quote-card,
.paper-block,
.lab-card,
.author-card,
.footer-card {
  position: relative;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--line);
  border-radius: 24px;
}

.equation-box {
  padding: 24px;
}

.hero-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-self: stretch;
}

.hero-theory-card {
  padding: 18px 20px;
  position: relative;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.64), rgba(247, 242, 233, 0.74));
  border: 1px solid var(--line);
  border-radius: 24px;
  min-height: 0;
}

.hero-theory-card::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), rgba(29, 110, 109, 0.55));
}

.hero-theory-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.hero-theory-kind {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-theory-card h3 {
  margin: 10px 0 8px;
  font-family: var(--serif);
  font-size: 30px;
  line-height: 0.95;
  letter-spacing: -0.02em;
}

.hero-theory-card p {
  font-size: 14px;
  line-height: 1.68;
}

.hero-theory-card .label {
  color: var(--accent);
}

.hero-stack .hero-theory-card:last-child {
  grid-column: 1 / -1;
}

.equation-box .label,
.stat-card .label,
.mini-label,
.axiom-index,
.list-card .label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.equation-box .equation {
  font-size: 22px;
  margin: 14px 0 8px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.stat-card {
  padding: 18px;
}

.stat-card strong {
  display: block;
  margin-top: 14px;
  font-size: 26px;
  font-family: var(--serif);
}

.section {
  padding: 28px 0;
}

.paper-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 24px;
  align-items: start;
}

.paper-hero-copy .paper-title {
  font-size: clamp(30px, 4.3vw, 58px);
  line-height: 1.02;
  margin-bottom: 10px;
}

.paper-meta-line {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.paper-abstract-box-block {
  margin-top: 4px;
  padding: 14px 16px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.44);
}

.paper-hero-copy .hero-lead,
.paper-abstract-prose {
  max-width: none;
  font-size: 15px;
  line-height: 1.72;
  font-family: var(--sans);
}

.paper-hero-copy .hero-lead {
  margin-bottom: 10px;
}

.paper-abstract-prose + .paper-abstract-prose {
  margin-top: 8px;
}

.paper-abstract-box {
  margin-top: 16px;
  padding: 14px 16px;
}

.paper-abstract-box .hero-abstract-head {
  margin-bottom: 10px;
}

.paper-abstract-box .hero-abstract-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
}

.paper-abstract-box .hero-abstract-item {
  display: grid;
  gap: 2px;
}

.paper-abstract-box .hero-abstract-item:last-child {
  grid-column: 1 / -1;
}

.paper-abstract-box .hero-abstract-key {
  font-size: 10px;
}

.paper-abstract-value {
  font-size: 14px;
}

.paper-side-stack .hero-theory-card h3 {
  font-size: 24px;
  line-height: 1;
}

.paper-side-stack .hero-theory-card p {
  font-size: 13px;
  line-height: 1.64;
}

.paper-side-stack .hero-theory-card {
  min-height: 208px;
  padding: 22px 24px;
}

.paper-side-stack .hero-theory-card:last-child {
  min-height: 258px;
}

.paper-side-stack .paper-bridge-card {
  min-height: 0;
}

.paper-side-stack .hero-theory-meta {
  margin-bottom: 6px;
}

.paper-side-stack .hero-theory-card h3 {
  margin-top: 12px;
  margin-bottom: 10px;
}

.theorem-list {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.theorem-list li {
  font-size: 13px;
  line-height: 1.62;
}

.theorem-list li + li {
  margin-top: 10px;
}

.theorem-list strong {
  color: var(--ink);
  font-weight: 600;
}

.paper-bridge-list {
  margin: 4px 0 12px;
  padding-left: 18px;
  color: var(--muted);
}

.paper-bridge-list li {
  font-size: 13px;
  line-height: 1.55;
}

.paper-bridge-list li + li {
  margin-top: 6px;
}

.paper-bridge-list a {
  color: inherit;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.paper-bridge-list a:hover {
  color: var(--ink);
  border-color: rgba(29, 26, 22, 0.2);
}

.paper-abstract-box {
  margin-top: 20px;
}

.paper-side-stack {
  display: grid;
  gap: 14px;
}

.paper-catalog {
  display: grid;
  gap: 16px;
}

.paper-entry {
  position: relative;
  padding: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.68), rgba(247, 242, 233, 0.74));
  border: 1px solid var(--line);
  border-radius: 24px;
}

.paper-entry::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), rgba(29, 110, 109, 0.45));
}

.paper-entry-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.paper-entry-head h3 {
  margin: 6px 0 0;
}

.paper-entry-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 300px);
  gap: 20px;
  align-items: end;
  margin-bottom: 22px;
}

.section-head h2 {
  font-size: clamp(38px, 6vw, 66px);
  margin-bottom: 12px;
}

.section-kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--accent);
  text-transform: uppercase;
}

.panel {
  padding: clamp(22px, 4vw, 34px);
  border-radius: 30px;
}

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

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

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

.axiom-card {
  padding: 20px 22px 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.68), rgba(247, 242, 233, 0.74));
  border-radius: 22px;
}

.axiom-card::before {
  content: "";
  display: block;
  width: 86px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), rgba(29, 110, 109, 0.45));
  margin-bottom: 16px;
}

.axiom-card:hover,
.card:hover,
.lab-card:hover,
.list-card:hover {
  transform: translateY(-3px);
  transition: transform 0.25s ease, border-color 0.25s ease;
  border-color: rgba(157, 79, 47, 0.35);
}

.axiom-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 12px;
}

.axiom-index {
  color: var(--accent);
}

.axiom-top .pill {
  background: rgba(29, 26, 22, 0.03);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.axiom-card h3,
.card h3,
.list-card h3,
.paper-block h3,
.lab-card h3,
.author-card h3,
.footer-card h3 {
  font-size: 28px;
  margin-bottom: 12px;
}

.axiom-card h3 {
  font-size: 24px;
  line-height: 1.05;
}

.axiom-formula,
.mono-block {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(29, 26, 22, 0.035);
  border: 1px solid rgba(29, 26, 22, 0.1);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
}

.structural-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.68), rgba(247, 242, 233, 0.72));
}

.structural-card .mini-label {
  color: var(--accent);
}

.card,
.list-card,
.paper-block,
.lab-card,
.author-card,
.footer-card,
.quote-card,
.timeline-item {
  padding: 24px;
}

.tag-row,
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag,
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
}

.accent {
  color: var(--accent);
}

.teal {
  color: var(--teal);
}

.split-note {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
}

.quote-card blockquote {
  margin: 0;
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.05;
}

.paper-meta,
.author-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 20px;
}

.paper-title {
  font-size: clamp(36px, 6vw, 72px);
  margin-bottom: 18px;
}

.paper-abstract {
  font-size: 18px;
  max-width: 840px;
  color: var(--muted);
}

.paper-layout,
.experience-layout,
.author-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(260px, 0.55fr);
  gap: 20px;
}

.paper-block h4,
.list-card h4,
.lab-card h4,
.author-card h4,
.timeline-item h4 {
  margin: 0 0 10px;
  font-size: 16px;
  letter-spacing: 0.02em;
}

.ordered-list {
  margin: 16px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.ordered-list li + li {
  margin-top: 10px;
}

.lab-grid,
.timeline,
.footer-grid {
  display: grid;
  gap: 16px;
}

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

.experience-groups {
  display: grid;
  gap: 18px;
}

.group-panel {
  padding: 24px;
}

.group-panel .section-head {
  margin-bottom: 18px;
}

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

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

.lab-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 240px;
}

.lab-card .card-link,
.footer-card .card-link {
  margin-top: 18px;
  color: var(--accent);
  font-size: 14px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.timeline-item .year {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
}

.author-portrait {
  min-height: 380px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.7), rgba(239, 229, 213, 0.8)),
    radial-gradient(circle at 30% 30%, rgba(29, 110, 109, 0.12), transparent 30%),
    radial-gradient(circle at 70% 65%, rgba(157, 79, 47, 0.16), transparent 34%);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
}

.author-portrait .mark {
  width: 120px;
  height: 120px;
  border-radius: 30px;
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: 76px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(29, 26, 22, 0.08);
  margin: 0 auto 18px;
}

.author-portrait p {
  max-width: 280px;
  margin: 0 auto;
  color: var(--muted);
}

.author-essay-hero h1 {
  font-size: clamp(40px, 6vw, 82px);
  margin-bottom: 12px;
}

.essay-deck {
  margin: 0 0 14px;
  max-width: 48rem;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(21px, 2.3vw, 30px);
  line-height: 1.36;
}

.author-essay-card .mark {
  width: 128px;
  font-size: 58px;
}

.author-essay-card p {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink);
}

.author-manifesto {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(29, 26, 22, 0.1);
}

.author-manifesto .mini-label {
  margin-bottom: 10px;
}

.author-manifesto p {
  max-width: 320px;
  margin: 0 auto;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.essay-article {
  padding: 28px 30px 32px;
}

.essay-section + .essay-section {
  margin-top: 2px;
}

.essay-article h2,
.essay-article h3 {
  margin: 0 0 14px;
  font-family: var(--serif);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.essay-article h2 {
  font-size: clamp(30px, 4.2vw, 46px);
  line-height: 1.04;
}

.essay-article h3 {
  font-size: clamp(26px, 3.1vw, 36px);
  line-height: 1.08;
}

.essay-article p,
.essay-article li {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.9;
}

.essay-article strong {
  color: var(--ink);
}

.essay-article code {
  padding: 2px 7px;
  border-radius: 8px;
  background: rgba(29, 26, 22, 0.05);
  border: 1px solid rgba(29, 26, 22, 0.08);
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--ink);
}

.essay-divider {
  height: 1px;
  margin: 26px 0;
  background: linear-gradient(90deg, rgba(157, 79, 47, 0.2), rgba(29, 26, 22, 0.06));
}

.essay-quote {
  margin: 18px 0;
  padding: 16px 18px;
  border-left: 3px solid rgba(157, 79, 47, 0.45);
  background: rgba(255, 255, 255, 0.42);
  border-radius: 0 18px 18px 0;
}

.essay-quote p {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.2;
}

.essay-quote-compact p {
  font-size: clamp(20px, 2.2vw, 28px);
}

.essay-equation {
  margin: 14px 0;
  padding: 12px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.42);
  color: var(--ink);
}

.essay-sidebar {
  display: grid;
  gap: 16px;
  align-content: start;
}

.essay-sticky-card {
  position: static;
}

.essay-reference-list {
  margin: 16px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.essay-reference-list li + li {
  margin-top: 10px;
}

.essay-reference-list a {
  color: var(--accent);
}

.essay-reference-list a:hover {
  color: var(--ink);
}

.essay-contact {
  margin: 14px 0 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ink);
}

.footer {
  padding: 20px 0 80px;
}

.footer-bar {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13px;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

@media (max-width: 1024px) {
  .hero-grid,
  .paper-hero-grid,
  .paper-layout,
  .experience-layout,
  .author-layout,
  .section-head,
  .split-note,
  .lab-grid,
  .footer-grid,
  .three-col,
  .two-col,
  .axiom-grid {
    grid-template-columns: 1fr;
  }

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

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

  .hero-actions-muted {
    gap: 12px 14px;
  }

  .hero-stack .hero-theory-card:last-child {
    grid-column: auto;
  }

  .essay-sticky-card {
    position: static;
  }
}

@media (max-width: 720px) {
  .topbar-inner {
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
    gap: 12px;
  }

  .lang-switch {
    order: -1;
  }

  .hero {
    padding-top: 28px;
  }

  .hero h1 {
    font-size: 54px;
  }

  .essay-article {
    padding: 24px 20px 26px;
  }

  .essay-divider {
    margin: 22px 0;
  }

  .essay-quote p {
    font-size: 22px;
  }

  .hero-lead {
    font-size: 20px;
    max-width: none;
  }

  .paper-abstract-box .hero-abstract-list {
    grid-template-columns: 1fr;
  }

  .paper-abstract-box .hero-abstract-item:last-child {
    grid-column: auto;
  }

  .hero-link {
    font-size: 11px;
    letter-spacing: 0.06em;
  }

  .hero-abstract-head,
  .hero-abstract-item {
    grid-template-columns: 1fr;
    display: grid;
  }

  .paper-entry-head {
    flex-direction: column;
  }

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

  .timeline-item {
    grid-template-columns: 1fr;
  }
}