:root {
  color-scheme: light;
  --ink: #1c2430;
  --muted: #596474;
  --line: #dce2ea;
  --paper: #ffffff;
  --soft: #f4f7f8;
  --accent: #9b3f38;
  --accent-strong: #672d2a;
  --blue: #295f8f;
  --green: #39715c;
  --shadow: 0 18px 48px rgba(28, 36, 48, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

a {
  color: var(--blue);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 24px;
}

.brand {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 700;
  text-decoration: none;
}

.tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
}

.tab-link {
  border-radius: 999px;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 13px;
  text-decoration: none;
  white-space: nowrap;
}

.tab-link.active {
  background: var(--accent);
  color: #fff;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 36px 24px 64px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
  align-items: center;
  gap: 48px;
  min-height: 520px;
  padding: 44px 0 52px;
}

.eyebrow {
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 10px;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  font-size: clamp(2.5rem, 8vw, 5.4rem);
  line-height: 0.98;
  margin-bottom: 22px;
}

h2 {
  font-size: 1.25rem;
  line-height: 1.25;
  margin-bottom: 12px;
}

h3 {
  font-size: 1.05rem;
  line-height: 1.35;
  margin-bottom: 6px;
}

.lede {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.25rem;
}

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

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 20px;
}

.button {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  display: inline-flex;
  font-weight: 700;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  text-decoration: none;
}

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

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

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

.portrait {
  margin: 0;
}

.portrait img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  box-shadow: var(--shadow);
  object-fit: cover;
}

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

.section-block,
.research-section {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

.section-block.wide {
  max-width: 780px;
}

.plain-list {
  margin: 0;
  padding-left: 20px;
}

.plain-list li + li {
  margin-top: 8px;
}

.page-heading {
  padding: 34px 0 28px;
}

.page-heading h1 {
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  margin-bottom: 0;
}

.research-section + .research-section {
  margin-top: 20px;
}

.paper-list {
  display: grid;
  gap: 14px;
  list-style-position: inside;
  margin: 0;
  padding: 0;
}

.paper-list li {
  background: #fbfcfd;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}

.paper-list article {
  display: inline;
}

.paper-list h3 {
  display: inline;
}

.paper-list p {
  color: var(--muted);
  margin-top: 6px;
  margin-bottom: 0;
}

.contact-block h2:not(:first-child) {
  margin-top: 24px;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  margin: 0 auto;
  max-width: 1120px;
  padding: 22px 24px 36px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 820px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .tabs {
    width: 100%;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 22px;
  }

  .portrait {
    max-width: 320px;
  }

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

@media (max-width: 520px) {
  main {
    padding-inline: 16px;
  }

  .header-inner {
    padding-inline: 16px;
  }

  .tab-link {
    padding-inline: 11px;
  }

  .section-block,
  .research-section,
  .paper-list li {
    padding: 18px;
  }
}