:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-accent: #2563eb;
  --font-body: system-ui, -apple-system, "Segoe UI", sans-serif;
  --max-width: 1100px;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
}

header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}

header nav ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

header nav a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
}

main section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

#contact-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 480px;
}

#contact-form input,
#contact-form textarea {
  padding: 0.6rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font: inherit;
}

#contact-form button {
  background: var(--color-accent);
  color: #fff;
  border: none;
  padding: 0.75rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
}

#contact-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

footer {
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  color: #555;
}

footer a { color: inherit; }