:root {
  --color-primary: oklch(55% 0.2 250);
  --color-primary-light: oklch(65% 0.15 250);
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-background: #fafafa;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --spacing-unit: 8px;
  --font-family-base: system-ui, -apple-system, sans-serif;
  --font-family-mono: ui-monospace, 'SF Mono', monospace;
  --max-width: 900px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #f0f0f0;
    --color-text-muted: #9ca3af;
    --color-background: #0f0f1a;
    --color-surface: #1a1a2e;
    --color-border: #2d2d44;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

a,
a:visited {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

body {
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  min-block-size: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background-color: var(--color-surface);
  border-block-end: 1px solid var(--color-border);
  padding: calc(var(--spacing-unit) * 2);
}

nav {
  max-inline-size: var(--max-width);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 2);
}

.logo {
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.logo:hover {
  text-decoration: underline;
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.nav-separator {
  color: var(--color-text-muted);
}

.github-link {
  margin-inline-start: auto;
  display: inline-flex;
  color: var(--color-text-muted);
  opacity: 0.6;
  transition: opacity 0.15s, color 0.15s;
}

.github-link:hover {
  color: var(--color-primary);
  opacity: 1;
}

.site-title {
  font-weight: 500;
}

main {
  flex: 1;
  max-inline-size: var(--max-width);
  margin-inline: auto;
  padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 2);
  inline-size: 100%;
}

.hero {
  text-align: center;
  margin-block-end: calc(var(--spacing-unit) * 6);
}

.hero h1 {
  font-family: var(--font-family-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--color-primary-light);
  letter-spacing: -0.02em;
  margin-block-end: calc(var(--spacing-unit) * 1);
  animation: fade-in-up 0.6s ease-out;
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

.hero .concepts {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: calc(var(--spacing-unit) * 2);
  max-inline-size: 46rem;
  margin-inline: auto;
  margin-block-start: calc(var(--spacing-unit) * 4);
  text-align: start;
}

.hero .concepts::after {
  content: "+" / "";
  grid-column: 2;
  grid-row: 1;
  align-self: center;
  font-family: var(--font-family-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: oklch(from var(--color-text-muted) l c h / 0.6);
  animation: fade-in-up 0.6s ease-out 0.15s backwards;
}

.hero .concept:nth-child(2) {
  grid-column: 3;
  grid-row: 1;
}

@media (max-width: 640px) {
  .hero .concepts {
    grid-template-columns: 1fr;
  }

  .hero .concepts::after {
    grid-column: 1;
    grid-row: 2;
    justify-self: center;
  }

  .hero .concept:nth-child(2) {
    grid-column: 1;
    grid-row: 3;
  }
}

.hero .concept {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: calc(var(--spacing-unit) * 2.5);
  animation: fade-in-up 0.6s ease-out backwards;
}

.hero .concept:nth-child(2) {
  animation-delay: 0.15s;
}

.hero .concept dt {
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-light);
  margin-block-end: calc(var(--spacing-unit) * 1);
}

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

.hero .net-effect {
  margin-block-start: calc(var(--spacing-unit) * 3);
  font-family: var(--font-family-mono);
  font-size: 0.9rem;
  color: var(--color-text);
  animation: fade-in-up 0.6s ease-out 0.3s backwards;
}

.net-effect-label {
  font-size: 1.25rem;
  font-weight: 600;
  color: oklch(from var(--color-text-muted) l c h / 0.6);
  margin-inline-end: calc(var(--spacing-unit) * 0.5);
}

.hero a {
  color: var(--color-primary-light);
  text-decoration: none;
  border-bottom: 1px solid oklch(from var(--color-primary-light) l c h / 0.4);
  transition: border-color 0.15s;
}

.hero a:hover {
  border-color: var(--color-primary-light);
}

.spec-driven {
  margin-block-end: calc(var(--spacing-unit) * 3);
}

.downloads {
  display: grid;
  gap: calc(var(--spacing-unit) * 3);
}

.download-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: calc(var(--spacing-unit) * 3);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px oklch(from var(--color-primary) l c h / 0.1);
}

.download-card h2 {
  font-size: 1.25rem;
  margin-block-end: calc(var(--spacing-unit) * 1);
}

.download-card h2 a {
  color: var(--color-primary-light);
  text-decoration: none;
}

.download-card h2 a:hover {
  text-decoration: underline;
}

.download-card > p {
  color: var(--color-text-muted);
  margin-block-end: calc(var(--spacing-unit) * 2);
}


.group-title {
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: oklch(from var(--color-text-muted) l c h / 0.6);
  margin-block-end: calc(var(--spacing-unit) * 1);
}

.file-list + .group-title {
  margin-block-start: calc(var(--spacing-unit) * 3);
}

.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit) * 1.5);
}

.file-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: calc(var(--spacing-unit) * 1);
}

.file-list a {
  font-family: var(--font-family-mono);
  font-size: 0.9rem;
  color: var(--color-primary);
  text-decoration: none;
  padding: calc(var(--spacing-unit) * 0.5) calc(var(--spacing-unit) * 1);
  background-color: oklch(from var(--color-primary) l c h / 0.1);
  border-radius: 4px;
  transition: background-color 0.15s;
}

.file-list a:hover {
  background-color: oklch(from var(--color-primary) l c h / 0.2);
  text-decoration: underline;
}

.details-link {
  font-size: 0.8rem;
  background-color: transparent;
  color: var(--color-text-muted);
  padding: calc(var(--spacing-unit) * 0.25) calc(var(--spacing-unit) * 0.5);
}

.details-link:hover {
  color: var(--color-primary);
  background-color: transparent;
}

.file-desc {
  flex: 1 1 12rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.badge-new {
  font-family: var(--font-family-mono);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  background-color: oklch(from var(--color-primary) l c h / 0.12);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.25);
  padding: 0.05em 0.45em;
  border-radius: 999px;
  vertical-align: middle;
}

.badge-labs {
  --color-labs: oklch(60% 0.15 60);
  font-family: var(--font-family-mono);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-labs);
  background-color: oklch(from var(--color-labs) l c h / 0.12);
  border: 1px solid oklch(from var(--color-labs) l c h / 0.25);
  padding: 0.05em 0.45em;
  border-radius: 999px;
  vertical-align: middle;
}

.file-list li.highlight-new {
  background-color: oklch(from var(--color-primary) l c h / 0.06);
  border-inline-start: 2px solid oklch(from var(--color-primary) l c h / 0.4);
  border-radius: 4px;
  padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1);
  margin-inline-start: calc(var(--spacing-unit) * -1);
}

section[id],
.group-title[id] {
  scroll-margin-block-start: calc(var(--spacing-unit) * 3);
}

.section-anchor,
.section-anchor:visited {
  color: inherit;
}

.section-anchor:hover {
  text-decoration: none;
}

.section-anchor::after {
  content: " #";
  opacity: 0;
  color: var(--color-primary);
  transition: opacity 0.15s;
}

.section-anchor:hover::after,
.section-anchor:focus-visible::after {
  opacity: 0.7;
}

.sidetrack {
  margin-block-start: calc(var(--spacing-unit) * 6);
  display: grid;
  gap: calc(var(--spacing-unit) * 3);
}

.sidetrack > h2 {
  font-family: var(--font-family-mono);
  font-size: 1.5rem;
  color: var(--color-text-muted);
}

.sidetrack > p {
  color: var(--color-text-muted);
  margin-block-start: calc(var(--spacing-unit) * -2);
}

.migrating {
  margin-block-start: calc(var(--spacing-unit) * 6);
  display: grid;
  gap: calc(var(--spacing-unit) * 3);
}

.migrating > h2 {
  font-family: var(--font-family-mono);
  font-size: 1.5rem;
  color: var(--color-text-muted);
}

.migrating > p {
  color: var(--color-text-muted);
  margin-block-start: calc(var(--spacing-unit) * -2);
}

.documentation {
  margin-block-start: calc(var(--spacing-unit) * 6);
  display: grid;
  gap: calc(var(--spacing-unit) * 3);
}

.documentation > h2 {
  font-family: var(--font-family-mono);
  font-size: 1.5rem;
  color: var(--color-text-muted);
}

.documentation > p {
  color: var(--color-text-muted);
  margin-block-start: calc(var(--spacing-unit) * -2);
}

.usage {
  margin-block-start: calc(var(--spacing-unit) * 6);
  display: grid;
  gap: calc(var(--spacing-unit) * 3);
}

.usage > h2 {
  font-family: var(--font-family-mono);
  font-size: 1.5rem;
  color: var(--color-text-muted);
}

.usage > p {
  color: var(--color-text-muted);
  margin-block-start: calc(var(--spacing-unit) * -2);
}

.install-any {
  background-color: oklch(from var(--color-primary) l c h / 0.07);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.35);
  border-inline-start: 4px solid var(--color-primary);
  border-radius: 8px;
  padding: calc(var(--spacing-unit) * 2.5);
  display: grid;
  gap: calc(var(--spacing-unit) * 1.5);
}

.install-any h3 {
  font-family: var(--font-family-mono);
  font-size: 1.25rem;
  color: var(--color-primary);
}

.install-any p {
  color: var(--color-text-muted);
}

.install-any-cmd {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: calc(var(--spacing-unit) * 1.5);
}

.install-any-download {
  font-family: var(--font-family-mono);
  font-weight: 600;
  color: var(--color-surface);
  background-color: var(--color-primary);
  padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
  border-radius: 6px;
  transition: background-color 0.15s;
}

.install-any-download:visited {
  color: var(--color-surface);
}

.install-any-download:hover {
  background-color: var(--color-primary-light);
  text-decoration: none;
}

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-block-end: calc(var(--spacing-unit) * 1);
}

summary {
  padding: calc(var(--spacing-unit) * 2);
  cursor: pointer;
  font-weight: 500;
}

summary a {
  color: var(--color-primary);
  text-decoration: none;
}

summary a:hover {
  text-decoration: underline;
}

summary:hover {
  background-color: oklch(from var(--color-primary) l c h / 0.05);
}

details p {
  padding: 0 calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2);
  color: var(--color-text-muted);
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.875em;
  background-color: var(--color-border);
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

footer {
  background-color: var(--color-surface);
  border-block-start: 1px solid var(--color-border);
  padding: calc(var(--spacing-unit) * 3);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

footer a {
  color: var(--color-primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
  }
}