:root {
  --font-base: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --color-surface: #ffffff;
  --color-background: #f5f5f7;
  --color-border: #d8dee4;
  --color-text: #1f2933;
  --color-text-muted: #52606d;
  --color-accent: #2563eb;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: 1.6;
}

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

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

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

.container {
  width: min(100% - 32px, var(--max-width));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.brand a {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav__list {
  display: flex;
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__list a {
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 4px 12px;
  border-radius: 6px;
}

.nav__list a:hover,
.nav__list a:focus-visible {
  background-color: rgba(37, 99, 235, 0.1);
  text-decoration: none;
}

.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
  cursor: pointer;
}

.nav__toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
}

main {
  background-color: var(--color-surface);
}

.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--color-border);
}

.hero__content {
  display: grid;
  gap: 32px;
  align-items: start;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.hero__eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.2;
}

.hero__lead {
  margin: 0 0 24px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.95rem;
}

.button:hover,
.button:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

.button--secondary {
  background: transparent;
}

.hero__visual {
  display: none;
}

.section {
  padding: 56px 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type {
  border-bottom: none;
}

.section__inner {
  display: grid;
  gap: 32px;
}

.section__header {
  display: grid;
  gap: 8px;
}

.section__eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.section h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.2rem);
}

.about {
  display: grid;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.about ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  list-style: disc;
}

.cards {
  display: grid;
  gap: 16px;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px;
  display: grid;
  gap: 12px;
}

.card__title {
  margin: 0;
  font-size: 1.15rem;
}

.card__description {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 0;
}

.meta div {
  display: grid;
  gap: 4px;
}

.meta dt {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.meta dd {
  margin: 0;
  font-weight: 500;
}

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.pub-list li {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.pub-list li:last-child {
  border-bottom: none;
}

.pub-list strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.pub-list span {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Publications grouping */
.pub-groups {
  display: grid;
  gap: 24px;
}

.pub-group {
  display: grid;
  gap: 12px;
}

.pub-group__title {
  margin: 0;
  font-size: 1.15rem;
}

.pub-subtitle {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}


.contact {
  display: grid;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.contact__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.contact__links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 500;
  color: var(--color-accent);
}

.site-footer {
  padding: 32px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  background-color: var(--color-surface);
}

.site-footer .container {
  padding: 0;
}

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__list {
    position: absolute;
    top: 64px;
    right: 16px;
    width: calc(100vw - 32px);
    max-width: 320px;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 8px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-surface);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .nav__list.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .meta {
    flex-direction: column;
    align-items: flex-start;
  }
}

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