:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --border-hover: #d1d5db;
  --card-bg: #ffffff;
  --card-hover: #f9fafb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --ring: rgba(37, 99, 235, 0.2);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --text: #f3f4f6;
    --text-muted: #9ca3af;
    --border: #27272a;
    --border-hover: #3f3f46;
    --card-bg: #0a0a0a;
    --card-hover: #121212;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --ring: rgba(59, 130, 246, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.wrap { 
  max-width: 840px; 
  width: 100%; 
  margin: 0 auto; 
  padding: 64px 24px;
  display: flex; 
  flex-direction: column; 
  gap: 80px;
}

header { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
  gap: 16px;
  animation: fadeIn 0.5s ease-out;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -0.02em; }
.brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background-color: var(--primary);
}

.nav-links {
  display: flex; gap: 24px; align-items: center;
  font-size: 14px;
}
.nav-links a { 
  color: var(--text-muted); 
  text-decoration: none; 
  font-weight: 500; 
  transition: color 0.2s ease; 
}
.nav-links a:hover { color: var(--text); }

main { 
  display: flex; flex-direction: column; gap: 80px; 
  animation: fadeIn 0.6s ease-out 0.1s both; 
}

@keyframes fadeIn { 
  from { opacity: 0; transform: translateY(10px); } 
  to { opacity: 1; transform: translateY(0); } 
}

.hero { max-width: 640px; }
.kicker { 
  color: var(--text-muted); 
  margin: 0 0 16px; 
  font-size: 14px; 
  font-weight: 500; 
  letter-spacing: 0.05em; 
  text-transform: uppercase; 
}
.title {
  margin: 0 0 24px;
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text);
}
.sub { 
  margin: 0 0 40px; 
  color: var(--text-muted); 
  line-height: 1.7; 
  font-size: 18px; 
  font-weight: 400; 
}
code { 
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; 
  background: var(--card-hover); 
  padding: 3px 6px; 
  border-radius: 4px; 
  font-size: 0.85em; 
  border: 1px solid var(--border); 
  color: var(--text);
}

.cta { display: flex; flex-wrap: wrap; gap: 16px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 20px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background-color: var(--card-bg);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.btn:hover { 
  background-color: var(--card-hover); 
  border-color: var(--border-hover);
}
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--ring);
}
.btn.primary { 
  border-color: transparent; 
  background-color: var(--primary); 
  color: #ffffff; 
}
.btn.primary:hover { 
  background-color: var(--primary-hover); 
}

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 24px 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.card {
  padding: 32px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background-color: var(--card-bg);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
}
.card:hover { 
  border-color: var(--border-hover);
  background-color: var(--card-hover);
  box-shadow: var(--shadow-lg);
}
.card h2 { 
  margin: 0 0 12px; 
  font-size: 18px; 
  font-weight: 600; 
  letter-spacing: -0.01em; 
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.card h2::after {
  content: '↗';
  font-size: 14px;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: translate(-4px, 4px);
}
.card:hover h2::after {
  opacity: 1;
  transform: translate(0, 0);
  color: var(--primary);
}
.card p { 
  margin: 0; 
  color: var(--text-muted); 
  line-height: 1.6; 
  font-size: 14px; 
}

footer { 
  padding-top: 40px; 
  border-top: 1px solid var(--border);
  color: var(--text-muted); 
  font-size: 14px; 
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  animation: fadeIn 0.6s ease-out 0.2s both;
}
.footer-links { 
  display: flex; 
  gap: 24px; 
}
.footer-links a { 
  color: var(--text-muted); 
  text-decoration: none; 
  transition: color 0.2s ease; 
}
.footer-links a:hover { color: var(--text); }
.copyright {
  font-size: 13px;
}

@media (max-width: 640px) {
  .wrap { padding: 40px 20px; gap: 60px; }
  main { gap: 60px; }
  footer { flex-direction: column; align-items: flex-start; }
}