:root {
  color-scheme: dark;
  --bg: #04070c;
  --surface: #0d151d;
  --surface-muted: #17222c;
  --text: #fefefe;
  --muted: #c2cbd5;
  --quiet: #8e99a7;
  --line: rgba(254, 254, 254, 0.12);
  --line-strong: rgba(254, 254, 254, 0.22);
  --accent: #71b6b2;
  --accent-strong: #9fd1ce;
  --ink: #1d262f;
  --max: 960px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Geist, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding: 12px clamp(16px, 4vw, 48px);
  background: rgba(4, 7, 12, 0.86);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.brand-link,
.nav-links a {
  text-decoration: none;
}

.brand-link {
  font-family: var(--mono);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--muted);
}

.nav-links a {
  transition: color 160ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--accent-strong);
}

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

.masthead {
  padding: clamp(40px, 8vw, 72px) 0 clamp(24px, 4vw, 40px);
}

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

.masthead h1 {
  margin: 0 0 14px;
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  font-weight: 720;
  line-height: 1.02;
  letter-spacing: -0.01em;
}

.masthead-tagline {
  max-width: 56ch;
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.55;
}

.studies {
  padding: 8px 0 64px;
}

.studies-heading {
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.study-list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.study-link {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--text);
  transition: padding-left 220ms ease, border-color 220ms ease, color 220ms ease;
}

.study-link:hover,
.study-link:focus-visible {
  padding-left: 10px;
  border-color: var(--line-strong);
  color: var(--accent-strong);
  outline: none;
}

.study-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  color: var(--quiet);
}

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

.study-dot {
  color: var(--line-strong);
}

.study-headline {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.study-title {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  font-weight: 650;
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.study-arrow {
  font-family: var(--mono);
  color: var(--quiet);
  transition: transform 220ms ease, color 220ms ease;
}

.study-link:hover .study-arrow,
.study-link:focus-visible .study-arrow {
  color: var(--accent-strong);
  transform: translateX(4px);
}

.study-desc {
  max-width: 72ch;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.footer {
  width: min(var(--max), calc(100% - 32px));
  margin-inline: auto;
  padding: 22px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.footer p {
  margin-bottom: 0;
}

.footer a {
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 420ms ease, transform 420ms ease;
}

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

@media (max-width: 760px) {
  .site-header {
    min-height: 52px;
    padding-inline: 16px;
  }

  .brand-link {
    font-size: 0.86rem;
  }

  .nav-links {
    gap: 12px;
    font-size: 0.8rem;
  }

  .masthead {
    padding-top: 32px;
  }

  .study-meta {
    flex-wrap: wrap;
    font-size: 0.76rem;
  }

  .study-headline {
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}