/* ===== Reset ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ===== Base ===== */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  color: #111;
  background: #fafafa;
  line-height: 1.6;
}

a {
  color: #0057ff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== Layout ===== */
.container {
  max-width: 900px;
  padding: 32px 20px;
  margin: 0 auto;
}

header {
  margin-bottom: 48px;
}

nav {
  display: flex;
  gap: 20px;
  margin-top: 16px;
}

nav a {
  font-weight: 500;
}

/* ===== Typography ===== */
h1 {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

h2 {
  font-size: 1.6rem;
  margin: 32px 0 12px;
}

p {
  margin-bottom: 16px;
}

/* ===== Sections ===== */
.card {
  background: white;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

/* ===== Footer ===== */
footer {
  margin-top: 64px;
  font-size: 0.9rem;
  color: #555;
}

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