* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #111;
  background: #ffffff;
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 2rem;
}

/* HEADER */
.header {
  background: #0d0d0d;
  color: #fff;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav a {
  color: #fff;
  margin-left: 1.5rem;
  font-size: 0.95rem;
  opacity: 0.8;
}

.nav a:hover {
  opacity: 1;
}

/* HERO */
.hero {
  padding: 5rem 0 4rem 0;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero p {
  max-width: 600px;
  font-size: 1.1rem;
  opacity: 0.8;
}

/* BUTTONS */
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  margin-right: 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  border: 1px solid #111;
  transition: all 0.2s ease;
}

.primary {
  background: #111;
  color: #fff;
}

.primary:hover {
  background: #000;
}

.secondary {
  background: transparent;
}

.secondary:hover {
  background: #111;
  color: #fff;
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.card {
  border: 1px solid #eee;
  padding: 2rem;
  transition: all 0.2s ease;
}

.card:hover {
  border-color: #111;
}

/* FOOTER */
.footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid #eee;
  font-size: 0.9rem;
  opacity: 0.7;
}