:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f8;
  --color-text: #1b2430;
  --color-text-muted: #5b6672;
  --color-primary: #1c6b4f;
  --color-primary-dark: #124a37;
  --color-border: #dfe4e8;
  --max-width: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12161b;
    --color-bg-alt: #1a1f26;
    --color-text: #e8ecef;
    --color-text-muted: #a3adb6;
    --color-primary: #3fae85;
    --color-primary-dark: #74d6ad;
    --color-border: #2a313a;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
}

.header-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.brand span {
  color: var(--color-primary);
}

.main-nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.main-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--color-primary);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.hero {
  text-align: center;
  padding: 2rem 0 3rem;
}

.hero h1 {
  font-size: 2.1rem;
  margin-bottom: 0.75rem;
}

.hero p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
}

.card h3 {
  margin-top: 0;
  color: var(--color-primary);
}

.steps {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
  display: grid;
  gap: 1rem;
}

.steps li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.cta {
  text-align: center;
  margin-top: 2.5rem;
}

.button {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
}

.button:hover,
.button:focus-visible {
  background: var(--color-primary-dark);
}

article h1 {
  font-size: 1.75rem;
}

article h2 {
  font-size: 1.25rem;
  margin-top: 2rem;
}

.updated-at {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding: 2rem 1.25rem;
  margin-top: 2rem;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-content p {
  margin: 0.3rem 0;
}

.footer-content a {
  color: var(--color-text-muted);
}

.footer-links {
  margin-top: 0.75rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-links a {
  text-decoration: underline;
}

.fiscal-qr {
  margin-top: 1rem;
}