:root {
  --brand-green: #003319;
  --light-green: #e6f2ec;
  --dark-text: #1b3d2f;
  --bg: #ffffff;
  --transition: 0.3s;
}

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--dark-text);
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1rem; }

/* Header */
header { background: var(--light-green); }
.header__container { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; }
.header__logo img { height: 50px; }
.nav__list { list-style: none; display: flex; gap: 1.5rem; }
.nav__link { font-weight: bold; color: var(--brand-green); }
.nav__link--active, .nav__link:hover { text-decoration: underline; }

/* Hero */
.hero { display: flex; align-items: center; flex-wrap: wrap; gap: 2rem; padding: 4rem 0; }
.hero__content { flex: 1; min-width: 300px; }
.hero__title { font-size: 2.5rem; color: var(--brand-green); }
.hero__text { margin: 1rem 0; }
.btn { display: inline-block; background: var(--brand-green); color: #fff; padding: 0.75rem 1.5rem; border-radius: 4px; transition: background var(--transition); }
.btn:hover { background: #005d33; }
.hero__image img { width: 100%; max-width: 600px; border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); display: block; }

/* Certificações */
.certifications { padding: 4rem 0; text-align: center; }
.certifications__list { list-style: none; display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; margin-top: 1rem; }
.certifications__list img { height: 60px; width: auto; display: block; }

/* Footer */
footer { background: var(--brand-green); color: #fff; padding: 2rem 0; text-align: center; }
footer a { color: #fff; opacity: 0.8; }
.social { margin-top: 1rem; display: flex; justify-content: center; gap: 1rem; }

/* Responsivo */
@media(max-width: 768px) {
  .hero { flex-direction: column; text-align: center; }
  .hero__image { order: -1; }
}