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

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e5e5e5;
  --text: #111111;
  --muted: #666666;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Nav */
header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.5px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav ul a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s;
}

nav ul a:hover {
  color: var(--text);
}

/* Hero */
main {
  flex: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

.hero {
  padding: 6rem 0 4rem;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1.5px;
  margin-bottom: 1rem;
}

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

/* Cards */
.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding-bottom: 4rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.card:hover {
  border-color: #bbb;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.card-icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 2rem;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}