:root {
  --bg: #f9f7f3;        /* soft paper-like background */
  --fg: #141414;        /* main text */
  --muted: #5f5f5f;     /* subtle secondary text */
  --link: #0f0f0f;      /* link color (kept dark, relies on underline) */
  --accent: rgba(0,0,0,0.08);
  --maxw: 68ch;         /* wide but comfortable */
  --lh: 1.6;
  --space: 1.2rem;
  --space-lg: 2.2rem;
}

html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Crimson Pro", ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  font-size: 18px;
  line-height: var(--lh);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Frame */
.frame {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.25rem 1.25rem 4rem;
}

/* Top nav */
.topbar {
  position: sticky;
  top: 0;
  backdrop-filter: saturate(120%) blur(2px);
  background: color-mix(in oklab, var(--bg) 92%, white);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  z-index: 5;
}

.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: .85rem 1.25rem;
  display: flex;
  gap: 1.25rem;
}

.nav a {
  font-size: 0.98rem;
  color: var(--fg);
  text-decoration: none;
  position: relative;
  opacity: 0.9;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .18s ease-out;
  opacity: 0.5;
}

.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
}

.nav .spacer {
  flex: 1;
}

/* Page content */
header.site {
  padding-top: 2.2rem;
  padding-bottom: 0.6rem;
}

header.site h1 {
  font-size: clamp(2rem, 4.6vw, 3rem);
  line-height: 1.15;
  margin: 0 0 .5rem 0;
  letter-spacing: .2px;
  font-weight: 600;
}

header.site p.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

main.prose {
  margin-top: var(--space-lg);
}

h2 {
  font-size: clamp(1.4rem, 2.2vw, 1.7rem);
  line-height: 1.25;
  margin: 0 0 .6rem 0;
  font-weight: 600;
}

p {
  margin: 0 0 var(--space) 0;
}

a {
  color: var(--link);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover {
  text-decoration-thickness: 2px;
}

/* Call-to-action button */
.btn {
  display: inline-block;
  border: 1px solid var(--accent);
  padding: .55rem .85rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--fg);
  background: transparent;
  transition: background .15s ease-in, border-color .15s ease-in;
}

.btn:hover {
  background: rgba(0,0,0,0.03);
  border-color: rgba(0,0,0,0.14);
}

/* Footer */
footer.site {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(0,0,0,0.06);
  color: var(--muted);
  font-size: .95rem;
}

/* Large screen adjustment */
@media (min-width: 1200px) {
  .frame {
    padding-left: 0;
    padding-right: 0;
  }
}

/* Accessibility: reduced motion */
@media (prefers-reduced-motion: reduce) {
  .nav a::after {
    transition: none;
  }
}