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

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  background: #f5f7fb;
  color: #1a237e;
}

.layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
  text-align: center;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  padding: 1rem 1.25rem 1.25rem;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: #3949ab;
  border-top: 1px solid rgba(26, 35, 126, 0.12);
}

.footer-copy {
  margin: 0;
  text-align: left;
  flex: 1 1 12rem;
}

.footer-credit {
  margin: 0;
  text-align: right;
  flex: 0 1 auto;
}

.footer-credit a {
  color: #1a237e;
  font-weight: 600;
  text-decoration: none;
}

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

.footer-credit a:focus-visible {
  outline: 2px solid #1a237e;
  outline-offset: 2px;
}

@media (max-width: 36rem) {
  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-copy,
  .footer-credit {
    text-align: left;
  }
}

.logo {
  width: min(220px, 70vw);
  height: auto;
  display: block;
  margin-bottom: 1.75rem;
}

.welcome {
  margin: 0 0 1.75rem;
  font-size: clamp(1.125rem, 4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
  max-width: 28rem;
}

.whatsapp-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  background: #25d366;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease;
}

.whatsapp-btn:hover {
  background: #1ebe57;
}

.whatsapp-btn:focus-visible {
  outline: 3px solid #1a237e;
  outline-offset: 3px;
}

.whatsapp-btn:active {
  transform: scale(0.98);
}

.whatsapp-icon {
  width: 1.35rem;
  height: 1.35rem;
  flex-shrink: 0;
}