:root {
  color-scheme: dark;
  --bg-color: #101317;
  --card-bg: #161b22;
  --card-border: #262c36;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --accent-color: #10B981;
  --accent-hover: #34d399;
  --focus-ring: #10B981;
}

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  transform: translateY(-100%);
  background-color: var(--accent-color);
  color: #101317;
  font-weight: 600;
  padding: 12px 16px;
  text-decoration: none;
  z-index: 1000;
  border-radius: 0 0 4px 0;
}

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

.skip-link:hover,
.skip-link:focus-visible {
  color: #101317;
  border-radius: 0 0 4px 0;
  outline-offset: -3px;
}

.site-container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

header.hero {
  text-align: center;
  padding: 4.5rem 1rem 3rem;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0 0 1.5rem;
  font-size: 1.15rem;
  color: var(--text-muted);
}

.divider {
  width: 48px;
  height: 2px;
  background-color: var(--accent-color);
  margin: 0 auto;
}

main {
  flex: 1;
}

.intro {
  max-width: 560px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.intro p {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
  margin: 0 0 1.75rem;
  letter-spacing: -0.01em;
}

.approach {
  margin-bottom: 3.5rem;
}

.approach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .approach-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.approach-item {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: left;
  transition: border-color 150ms ease;
}

.approach-item h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
  color: var(--text-main);
}

.approach-item p {
  margin: 0;
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.apps {
  margin-bottom: 3.5rem;
}

.app-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-left: 3px solid var(--accent-color);
  border-radius: 8px;
  padding: 1.75rem;
  text-align: left;
  transition: border-color 150ms ease;
}

@media (hover: hover) {
  .approach-item:hover {
    border-color: rgba(16, 185, 129, 0.4);
  }

  .app-card:hover {
    border-color: rgba(16, 185, 129, 0.4);
    border-left-color: var(--accent-color);
  }
}

.app-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.app-title {
  margin: 0 0 0.75rem;
  font-size: 1.4rem;
  color: var(--text-main);
}

.app-description {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.975rem;
  line-height: 1.65;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.feature-list li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--text-main);
  font-size: 0.925rem;
  line-height: 1.5;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-color);
}

.not-found {
  text-align: center;
  padding: 5rem 1rem;
}

.not-found p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 2rem;
}

footer {
  margin-top: auto;
  padding: 2.5rem 0 1.5rem;
  border-top: 1px solid var(--card-border);
  text-align: center;
}

.footer-nav {
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1rem 1.75rem;
}

.footer-links a,
.back-link,
a {
  color: var(--accent-color);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease-in-out;
}

.footer-links a,
.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

@media (hover: hover) {
  .footer-links a:hover,
  .back-link:hover,
  a:hover {
    color: var(--accent-hover);
  }
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 2px;
}

.copyright {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

@media (max-width: 480px) {
  .site-container {
    padding: 0 1rem 2rem;
  }

  header.hero {
    padding: 3.5rem 0.5rem 2rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  .app-card {
    padding: 1.25rem;
  }

  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .approach-item,
  .app-card {
    transition: none !important;
  }
}

.policy {
  max-width: 680px;
  margin: 0 auto;
}

.policy h1 {
  text-align: left;
  font-size: 1.75rem;
  margin: 0 0 0.75rem;
}

.summary-box {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-left: 3px solid var(--accent-color);
  border-radius: 4px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-main);
}

.policy h2 {
  text-align: left;
  font-size: 1.2rem;
  margin: 2rem 0 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--card-border);
}

.policy .summary-box + h2 {
  border-top: none;
  padding-top: 0;
}

.policy p,
.policy li {
  color: var(--text-muted);
  line-height: 1.65;
}

.policy ul {
  padding-left: 1.25rem;
}

.policy li {
  margin-bottom: 0.5rem;
}

.policy code {
  font-size: 0.875em;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  color: var(--text-main);
}