:root {
  --ink: #15202b;
  --muted: #5b6775;
  --subtle: #f4f7f8;
  --line: #dbe3e7;
  --accent: #0f5f6e;
  --accent-dark: #0a4550;
  --accent-soft: #e7f2f4;
  --paper: #ffffff;
  --warm: #9b6b2f;
  --shadow: 0 18px 45px rgba(20, 32, 43, 0.08);
  --shadow-strong: 0 24px 70px rgba(20, 32, 43, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  color: var(--ink);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  margin: 0;
}

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

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

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

.container {
  margin: 0 auto;
  max-width: 1120px;
  padding: 0 28px;
  width: 100%;
}

.narrow {
  max-width: 860px;
}

.skip-link {
  background: var(--ink);
  color: #fff;
  left: 16px;
  padding: 10px 12px;
  position: absolute;
  top: -60px;
  z-index: 20;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-wrap {
  align-items: center;
  display: flex;
  gap: 28px;
  justify-content: space-between;
  min-height: 82px;
}

.brand {
  color: var(--ink);
  display: grid;
  gap: 2px;
  min-width: 230px;
  text-decoration: none;
}

.brand-name {
  font-size: 1.05rem;
  font-weight: 700;
}

.brand-role {
  color: var(--muted);
  font-size: 0.82rem;
}

.site-nav {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  justify-content: flex-end;
}

.site-nav a {
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 0;
  text-decoration: none;
}

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

.hero {
  background:
    linear-gradient(135deg, rgba(231, 242, 244, 0.75) 0%, rgba(255, 255, 255, 0) 40%),
    linear-gradient(180deg, #fbfcfc 0%, #ffffff 78%);
  border-bottom: 1px solid var(--line);
  padding: 74px 0 66px;
}

.hero-grid {
  align-items: center;
  display: grid;
  gap: 64px;
  grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.85fr);
}

.portrait-wrap {
  margin: 0;
  position: relative;
}

.portrait-wrap::before {
  background: var(--accent-soft);
  content: "";
  height: 84%;
  left: -20px;
  position: absolute;
  top: 28px;
  width: 74%;
  z-index: -1;
}

.portrait {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-strong);
  object-fit: cover;
  object-position: center 42%;
  width: 100%;
}

.eyebrow,
.section-label,
.tag {
  color: var(--warm);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

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

h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.35rem, 4.8vw, 3.65rem);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.04;
  margin-bottom: 24px;
  max-width: 920px;
}

h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.15;
  margin-bottom: 18px;
}

h3 {
  font-size: 1.04rem;
  line-height: 1.25;
  margin-bottom: 8px;
}

.lead {
  color: var(--muted);
  font-size: 1.18rem;
  margin-bottom: 26px;
  max-width: 700px;
}

.actions,
.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  align-items: center;
  border: 1px solid var(--line);
  color: var(--ink);
  display: inline-flex;
  font-weight: 700;
  min-height: 44px;
  padding: 10px 16px;
  text-decoration: none;
}

.button:hover {
  border-color: var(--accent);
}

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

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

.hero-meta {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 34px 0 0;
  max-width: 820px;
}

.hero-meta div {
  border-right: 1px solid var(--line);
  padding: 18px 18px 0 0;
}

.hero-meta div:last-child {
  border-right: 0;
  padding-right: 0;
}

.hero-meta dt {
  color: var(--warm);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-meta dd {
  color: var(--muted);
  font-size: 0.94rem;
  margin: 6px 0 0;
}

.section {
  padding: 70px 0;
}

.subtle {
  background: var(--subtle);
}

.two-column {
  display: grid;
  gap: 44px;
  grid-template-columns: minmax(190px, 0.6fr) minmax(0, 1.4fr);
}

.profile-grid {
  align-items: start;
  display: grid;
  gap: 44px;
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.25fr) minmax(250px, 0.75fr);
}

.profile-card {
  background: var(--ink);
  color: #fff;
  padding: 28px;
}

.profile-card h3 {
  color: #fff;
}

.profile-card .clean-list li {
  border-top-color: rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.82);
}

.prose {
  color: var(--muted);
  font-size: 1.05rem;
}

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

.section-heading {
  margin-bottom: 32px;
  max-width: 760px;
}

.section-heading.wide {
  align-items: end;
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 0.9fr) minmax(260px, 0.7fr);
  max-width: none;
}

.section-heading.wide p:last-child {
  color: var(--muted);
  margin-bottom: 18px;
}

.area-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.area-card,
.project-card,
.contact-card,
.cv-block,
.paper {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 24px;
}

.area-card p,
.project-card p,
.paper p,
.cv-block p,
.contact-card p,
.muted {
  color: var(--muted);
}

.area-card p,
.project-card p,
.paper p,
.cv-block p,
.contact-card p {
  margin-bottom: 0;
}

.split-list {
  display: grid;
  gap: 54px;
  grid-template-columns: minmax(240px, 0.74fr) minmax(0, 1.26fr);
}

.stack {
  display: grid;
  gap: 14px;
}

.item {
  align-items: start;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 18px;
  grid-template-columns: 96px 1fr auto;
  padding-top: 20px;
}

.item p {
  color: var(--muted);
  margin-bottom: 0;
}

.item-kicker {
  color: var(--warm);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding-top: 2px;
  text-transform: uppercase;
}

.item a,
.text-link,
.inline-links a {
  font-weight: 800;
}

.contact-band {
  background: var(--ink);
  color: #fff;
}

.contact-band .section-label,
.contact-band h2 {
  color: #fff;
}

.contact-grid {
  align-items: start;
  display: grid;
  gap: 40px;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.7fr);
}

.contact-links {
  display: grid;
  gap: 12px;
}

.contact-links a {
  color: #fff;
  font-weight: 700;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
  padding: 26px 0;
}

.footer-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}

.page-hero {
  background: linear-gradient(180deg, #f8fbfb 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
  padding: 70px 0 58px;
}

.compact-hero {
  padding: 58px 0 48px;
}

.page-hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.content-grid {
  align-items: start;
  display: grid;
  gap: 44px;
  grid-template-columns: 280px minmax(0, 1fr);
}

.sidebar {
  border-left: 4px solid var(--accent);
  padding-left: 22px;
  position: sticky;
  top: 110px;
}

.clean-list,
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.clean-list.compact li {
  padding: 11px 0;
}

.clean-list li,
.timeline li {
  border-top: 1px solid var(--line);
  padding: 13px 0;
}

.timeline span {
  color: var(--muted);
  display: block;
  margin-top: 3px;
}

.research-list,
.software-grid,
.cv-grid,
.contact-page-grid {
  display: grid;
  gap: 18px;
}

.research-section-title {
  border-bottom: 1px solid var(--line);
  padding: 4px 0 10px;
}

.research-section-title h2 {
  margin-bottom: 0;
}

.published-paper {
  border-top: 5px solid var(--warm);
}

.featured-paper {
  border-top: 5px solid var(--accent);
}

.paper h2,
.project-card h2,
.cv-block h2,
.contact-card h2 {
  font-size: 1.45rem;
}

.authors,
.project-subtitle {
  color: var(--accent-dark);
  font-weight: 700;
  margin-bottom: 12px;
}

.project-card.featured {
  border-top: 5px solid var(--accent);
  grid-column: 1 / -1;
}

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

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill-list span {
  background: var(--accent-soft);
  border: 1px solid #c7dde2;
  color: var(--accent-dark);
  font-weight: 700;
  padding: 9px 12px;
}

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

.note {
  background: var(--accent-soft);
  color: var(--accent-dark);
  display: inline-block;
  font-size: 0.94rem;
  margin: 0 0 18px;
  padding: 10px 12px;
}

.last-updated {
  color: var(--warm);
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-bottom: 24px;
  text-transform: uppercase;
}

.cv-layout {
  align-items: start;
  display: grid;
  gap: 54px;
  grid-template-columns: 260px minmax(0, 1fr);
}

.cv-sidebar {
  border-left: 4px solid var(--accent);
  padding-left: 22px;
  position: sticky;
  top: 110px;
}

.cv-sidebar h2 {
  font-size: 1.35rem;
}

.cv-toc {
  display: grid;
  gap: 10px;
}

.cv-toc a {
  color: var(--muted);
  font-weight: 700;
  text-decoration: none;
}

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

.cv-main {
  display: grid;
  gap: 54px;
}

.cv-section {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.cv-section > h2 {
  margin-bottom: 22px;
}

.cv-entry {
  display: grid;
  gap: 10px;
  padding: 0 0 24px;
}

.cv-entry + .cv-entry {
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.cv-entry-head {
  align-items: baseline;
  display: flex;
  gap: 18px;
  justify-content: space-between;
}

.cv-entry-head h3 {
  font-size: 1.18rem;
  margin-bottom: 0;
}

.cv-entry-head span {
  color: var(--warm);
  flex: 0 0 auto;
  font-size: 0.86rem;
  font-weight: 800;
}

.cv-entry p {
  color: var(--muted);
  margin-bottom: 0;
}

.cv-entry ul,
.cv-list {
  color: var(--muted);
  margin: 0;
  padding-left: 20px;
}

.cv-entry li,
.cv-list li {
  margin: 8px 0;
}

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

.cv-skill-grid div {
  border: 1px solid var(--line);
  padding: 20px;
}

.cv-skill-grid p {
  color: var(--muted);
  margin-bottom: 0;
}

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

.contact-card {
  display: grid;
  gap: 8px;
}

.contact-card a {
  font-weight: 800;
}

.not-found {
  align-items: center;
  display: flex;
  min-height: 100vh;
}

@media (max-width: 900px) {
  .hero-grid,
  .two-column,
  .profile-grid,
  .split-list,
  .contact-grid,
  .content-grid,
  .cv-layout,
  .section-heading.wide {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 34px;
  }

  .portrait-wrap {
    max-width: 520px;
    order: -1;
  }

  .area-grid,
  .software-grid,
  .cv-grid,
  .contact-page-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .cv-sidebar {
    position: static;
  }

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

@media (max-width: 680px) {
  .container {
    padding: 0 20px;
  }

  .nav-wrap {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
    padding: 18px 20px;
  }

  .site-nav {
    gap: 2px 14px;
    justify-content: flex-start;
  }

  .hero,
  .section,
  .page-hero {
    padding: 42px 0;
  }

  .hero-grid {
    gap: 30px;
  }

  h1 {
    font-size: clamp(2rem, 10vw, 2.45rem);
  }

  .lead {
    font-size: 1.05rem;
  }

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

  .hero-meta div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 14px 0;
  }

  .hero-meta div:last-child {
    border-bottom: 0;
  }

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

  .cv-entry-head {
    display: grid;
    gap: 6px;
  }

  .footer-wrap {
    display: grid;
  }
}