* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  color-scheme: light;
}

html.dark {
  color-scheme: dark;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  overflow-x: hidden;
}

body,
button,
a {
  font-family: var(--font-body);
}

img,
svg {
  display: block;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: var(--color-link);
}

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

.icon {
  width: var(--size-icon-md);
  height: var(--size-icon-md);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: 0 0 auto;
}

.container {
  width: min(1080px, calc(100% - var(--space-6) * 2));
  margin: 0 auto;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-surface);
  text-decoration: none;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-foreground);
  font-family: var(--font-display);
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-h4);
  text-decoration: none;
  flex: 0 0 auto;
}

.brand img {
  width: 36px;
  height: 36px;
}

.header-nav {
  margin-left: auto;
}

.header-actions,
.hero-actions,
.footer-links {
  display: flex;
  align-items: center;
}

.header-actions {
  gap: var(--space-2);
}

.theme-toggle {
  padding: 0 var(--space-3);
}

.theme-icon-moon {
  display: none;
}

.dark .theme-icon-sun {
  display: none;
}

.dark .theme-icon-moon {
  display: block;
}

.hero {
  padding: calc(var(--space-8) * 2) 0;
  border-bottom: 1px solid var(--color-border);
  scroll-margin-top: 68px;
}

.hero-inner {
  max-width: 840px;
}

.hero-label,
.section-label {
  margin: 0;
  color: var(--color-primary);
  font-size: var(--font-size-caption);
  font-weight: 600;
}

.hero h1 {
  margin: var(--space-4) 0;
}

.hero-description {
  max-width: 620px;
  margin: 0;
  color: var(--color-muted);
}

.hero-actions {
  gap: var(--space-3);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

.overview,
.resources,
.community {
  padding: calc(var(--space-8) + var(--space-6)) 0;
  scroll-margin-top: 68px;
}

.overview {
  background: var(--color-surface-container-low);
  border-bottom: 1px solid var(--color-border);
}

.overview-layout,
.community-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.2fr);
  gap: var(--space-8);
}

.section-title h2 {
  margin: var(--space-2) 0 0;
}

.overview-list {
  border-top: 1px solid var(--color-border);
}

.overview-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: var(--space-4);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border);
}

.overview-index {
  color: var(--color-muted);
  font-size: var(--font-size-caption);
}

.overview-item h3 {
  margin: 0 0 var(--space-2);
}

.overview-item p {
  margin: 0;
  color: var(--color-muted);
}

.resources-title {
  margin-bottom: var(--space-6);
}

.resource-list {
  border-top: 1px solid var(--color-border);
}

.resource-row {
  display: grid;
  grid-template-columns: minmax(160px, 0.6fr) minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-5);
  min-height: 88px;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-foreground);
  text-decoration: none;
}

.resource-row:hover .resource-name,
.resource-row:hover .resource-arrow {
  color: var(--color-link);
}

.resource-name {
  font-family: var(--font-display);
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-h4);
}

.resource-description {
  color: var(--color-muted);
}

.resource-arrow {
  color: var(--color-muted);
}

.community {
  background: var(--color-surface-container-low);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.community-description {
  max-width: 480px;
  margin: var(--space-3) 0 0;
  color: var(--color-muted);
}

.community-contact {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
}

.community-contact strong {
  font-family: var(--font-mono);
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-h2);
  letter-spacing: 0.04em;
}

.site-footer {
  background: var(--color-surface);
}

.footer-inner {
  min-height: 112px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.footer-brand div {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.footer-brand strong {
  font-family: var(--font-display);
  font-size: var(--font-size-caption);
}

.footer-brand span {
  color: var(--color-muted);
  font-size: var(--font-size-caption);
}

.footer-links {
  justify-content: flex-end;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-muted);
  font-size: var(--font-size-caption);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-link);
}

.theme-ready body,
.theme-ready .site-header,
.theme-ready .overview,
.theme-ready .community,
.theme-ready .site-footer,
.theme-ready .resource-row {
  transition-property: background-color, color, border-color;
  transition-duration: 240ms;
  transition-timing-function: ease;
}

@media (max-width: 800px) {
  .container {
    width: min(100% - var(--space-5) * 2, 680px);
  }

  .header-nav {
    display: none;
  }

  .hero {
    padding: calc(var(--space-8) + var(--space-7)) 0;
  }

  .overview,
  .resources,
  .community {
    padding: var(--space-8) 0;
  }

  .overview-layout,
  .community-layout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .community-contact {
    justify-content: flex-start;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: var(--space-6) 0;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 600px) {
  .container {
    width: calc(100% - var(--space-4) * 2);
  }

  .site-header .container {
    width: calc(100% - var(--space-3) * 2);
  }

  .header-inner {
    min-height: 60px;
    gap: var(--space-2);
  }

  .brand {
    gap: var(--space-2);
  }

  .brand img {
    width: 32px;
    height: 32px;
  }

  .theme-label {
    display: none;
  }

  .theme-toggle {
    padding: 0;
  }

  .header-cta {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .hero {
    padding: var(--space-8) 0;
  }

  .hero h1 {
    font-size: var(--font-size-h1);
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .resource-row {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-2) var(--space-4);
    min-height: 96px;
  }

  .resource-description {
    grid-column: 1;
    grid-row: 2;
  }

  .resource-arrow {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .community-contact {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-3);
  }

  .community-contact strong {
    font-size: var(--font-size-h3);
  }

  .footer-links {
    gap: var(--space-3) var(--space-4);
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0s !important;
    animation-duration: 0s !important;
    animation-iteration-count: 1 !important;
  }
}