@import url("variables.css");

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}

a:hover,
a:focus-visible {
  border-color: var(--color-accent);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: var(--space-sm);
  z-index: 99;
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
}

.skip-link:focus-visible { left: var(--space-sm); }

.shell {
  width: min(100% - 2.5rem, var(--line-wide));
  margin: 0 auto;
}

.content { max-width: var(--line-copy); }

/* Homepage sections use a ben-evans style label-left / content-right split.
   Scoped to sections that have an id, so article reading pages (no id) keep
   their title-on-top layout. About (#about) keeps the full-width text block. */
.section[id]:not(#about) .content {
  max-width: calc(11rem + var(--space-2xl) + var(--line-copy));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  column-gap: var(--space-2xl);
  align-items: start;
}

.section[id]:not(#about) .section-title {
  grid-column: 1;
  margin: 0;
}

.section[id] .section-intro,
.section[id] .stack,
.section[id] .prose,
.section[id] .group-title {
  grid-column: 2;
}

.section[id] .section-intro { margin-top: 0; }

.site-header {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  z-index: 20;
}

.nav-shell {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand {
  text-decoration: none;
  border-bottom: 0;
  color: var(--color-text);
  display: inline-flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand:hover { border-bottom: 0; }

.brand-name { font-size: var(--text-base); font-weight: 600; }
.brand-meta { font-size: var(--text-xs); color: var(--color-muted); }

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-nav a {
  text-decoration: none;
  font-size: var(--text-sm);
  color: var(--color-muted);
  padding: var(--space-2xs) 0;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text);
  border-color: var(--color-text);
}

.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: var(--space-2xs);
  cursor: pointer;
}

.mobile-nav-toggle span {
  display: block;
  width: 1.45rem;
  height: 2px;
  background: var(--color-text);
  margin: 0.22rem 0;
}

.section {
  padding: var(--space-2xl) 0;
  scroll-margin-top: calc(var(--header-height) + var(--space-md));
}

.section-emphasis {
  position: relative;
  background: var(--color-section-fill);
}

.section-emphasis::before,
.section-emphasis::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(
    to right,
    transparent 0,
    transparent calc(50% - var(--line-copy) / 2),
    var(--color-border) calc(50% - var(--line-copy) / 2 + 3rem),
    var(--color-border) calc(50% + var(--line-copy) / 2 - 3rem),
    transparent calc(50% + var(--line-copy) / 2),
    transparent 100%
  );
}

.section-emphasis::before {
  top: 0;
}

.section-emphasis::after {
  bottom: 0;
}

.section-emphasis .content {
  border: 0;
  border-radius: 0;
  padding: var(--space-lg);
}

.section-title {
  margin: 0 0 var(--space-xl);
  font-size: var(--text-section-title);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--color-text);
}

.section-intro {
  margin: -0.5rem 0 var(--space-xl);
  color: var(--color-muted);
  font-size: var(--text-lg);
  line-height: 1.65;
}

.group-title {
  margin: var(--space-lg) 0 var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-text);
}

.section[id] .group-title:first-of-type {
  margin-top: 0;
}

.stack {
  list-style: none;
  padding: 0;
  margin: 0;
}

.row {
  padding: var(--space-lg) 0;
}

.row-meta {
  margin: 0 0 var(--space-2xs);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.row-link span,
.row-title {
  margin: 0 0 var(--space-xs);
  font-size: 1rem;
  font-weight: 500;
  display: inline-block;
}

.row p,
.row-link small {
  margin: 0;
  color: var(--color-muted);
  display: block;
}

.row-link a {
  text-decoration: none;
  border-bottom: 0;
  display: block;
}

.row-link a span {
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}

.row-link a:hover span,
.row-link a:focus-visible span {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.row-link a { color: var(--color-text); }

.prose p { margin: 0 0 var(--space-md); color: var(--color-muted); line-height: 1.7; }
.prose h3,
.prose h4,
.prose h5 {
  margin: 0 0 var(--space-sm);
  color: var(--color-text);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.prose a { color: var(--color-accent); }
.prose ul {
  margin: 0 0 var(--space-md);
  padding-left: 1.1rem;
  color: var(--color-muted);
}
.prose li { margin-bottom: var(--space-xs); }

.section-emphasis .prose p:last-child {
  text-align: center;
  margin-bottom: var(--space-xs);
}

.section-emphasis .prose p:last-child a {
  font-size: var(--text-sm);
  text-decoration: none;
}

.section-emphasis .prose p:last-child a:hover,
.section-emphasis .prose p:last-child a:focus-visible {
  color: var(--color-accent);
}

.site-footer {
  padding: var(--space-xl) 0 var(--space-2xl);
  color: var(--color-muted);
  font-size: var(--text-sm);
  text-align: center;
  letter-spacing: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-mid) var(--ease-standard), transform var(--duration-mid) var(--ease-standard);
}

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

@media (max-width: 820px) {
  :root {
    --header-height: 4rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
  }
  .mobile-nav-toggle { display: inline-block; }
  .site-nav {
    position: fixed;
    inset: var(--header-height) 0 auto 0;
    padding: var(--space-md) 1.25rem var(--space-lg);
    background: color-mix(in srgb, var(--color-bg) 97%, transparent);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  .site-nav.open { display: flex; }
  .section[id]:not(#about) .content {
    grid-template-columns: 1fr;
    row-gap: var(--space-md);
    max-width: var(--line-copy);
  }
  .section { padding: var(--space-xl) 0; }
  .section-emphasis .content { padding: var(--space-md); }
  .section-title { letter-spacing: -0.02em; }
}