:root {
  --color-bg: #f5f7f6;
  --color-text: #1b1f1e;
  --color-subtitle: #4a534f;
  --color-whatsapp: #25d366;
  --color-whatsapp-hover: #1fb958;
  --color-focus: #0a6b3f;
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-system);
  padding: 24px;
}

.container {
  max-width: 480px;
  width: 100%;
  text-align: center;
}

h1 {
  font-size: 1.75rem;
  line-height: 1.25;
  margin: 0 0 12px;
}

.subtitle {
  font-size: 1.05rem;
  color: var(--color-subtitle);
  margin: 0 0 32px;
}

.btn-whatsapp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px 24px;
  background: var(--color-whatsapp);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 12px;
  transition: background-color 0.15s ease;
}

.btn-whatsapp:hover {
  background: var(--color-whatsapp-hover);
}

.btn-whatsapp:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.icon-whatsapp {
  flex-shrink: 0;
}

.footer {
  margin-top: 40px;
}

.footer p {
  font-size: 0.85rem;
  color: var(--color-subtitle);
}