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

body {
  font-family: -apple-system, BlinkMacSystemFont, "San Francisco", "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background-color: #0d1117;
  color: white;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Layout container */
.container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

/* Header */
header {
  background-color: #0d1117;
  border-bottom: 1px solid #1a1a1a;
}

.logo {
  font-weight: bold;
  font-size: clamp(1.25rem, 2vw, 1.75rem); /* responsive */
}

/* Navigation */
nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease;
  min-height: 44px;
  border-radius: 16px;
}

/* Primary button */
.nav-btn.primary {
  background-color: #2563eb;
  color: black;
  border: none;
  padding: 0.75rem 1.5rem;
}

/* Secondary button */
.nav-btn.secondary {
  background-color: #1f2937;
  color: white;
  border: none;
  padding: 0.75rem 1.75rem;
}

/* Main */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
}

main h1 {
  font-size: clamp(2rem, 6vw, 4rem); /* responsive */
  font-weight: 700;
  margin-bottom: 1rem;
}

main p {
  font-size: clamp(1.125rem, 3vw, 2rem); /* responsive */
  color: #a1a1aa;
  margin-bottom: 2rem;
}

.cta-button {
  display: inline-block;
  background-color: #1d4ed8;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.3s;
}

.cta-button:hover {
  background-color: #2563eb;
}

/* Footer */
footer {
  background-color: #0d1117;
  border-top: 1px solid #1a1a1a;
  padding: 1rem 2rem;
  font-size: 0.85rem;
}

.footer-container {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  width: 100%;
}

footer a {
  color: #a1a1aa;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}