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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  color: #222;
  background-color: #f7f7f7;
}


main {
  display: block;
}

.wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
}


header {
  background: #059669;
  color: white;
  padding: 1rem 0;
  border-bottom: 4px solid #047857;
}

header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  letter-spacing: 0.5px;
}


nav ul {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

nav a {
  text-decoration: none;
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  transition: transform 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}


nav a:focus-visible {
  background: rgba(255, 255, 255, 0.2);
  outline: none;
  transform: translateY(-1px);
}

nav a[aria-current="page"] {
  background: white;
  color: #059669;
  font-weight: 600;
}


h1, h2, h3 {
  line-height: 1.2;
}

h1 {
  margin-top: 1.25rem;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
}

/* === Sections === */
section {
  background: white;
  border: 1px solid #e6e6e6;
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

section h2 {
  margin-top: 0.25rem;
  font-size: clamp(1.1rem, 1.8vw, 1.4rem);
  color: #065f46;
}


ol, ul {
  padding-left: 1.2rem;
}

li { margin: 0.35rem 0; }


footer {
  background: #111827;
  color: #d1d5db;
  padding: 1rem 0;
  margin-top: 2rem;
  border-top: 4px solid #059669;
  font-size: 0.95rem;
}

footer a {
  color: #6ee7b7;
  text-decoration: underline;
}

footer p {
  margin: 0;
}


@media (min-width: 640px) {
  header .wrapper,
  footer .wrapper,
  main .wrapper {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}