:root {
  color-scheme: light;
  --primary: #005c53;
  --primary-dark: #00433c;
  --primary-soft: #d7f2ed;
  --background: #f4f7f6;
  --surface: #ffffff;
  --text: #17201f;
  --muted: #536460;
  --border: #dbe4e1;
  --shadow: 0 8px 28px rgba(21, 55, 50, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

a {
  color: var(--primary);
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: var(--primary-dark);
}

.site-header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #ffffff;
}

.header-content,
.page,
.footer-content {
  width: min(100% - 2rem, 760px);
  margin-inline: auto;
}

.header-content {
  padding-block: 2.5rem;
}

.brand {
  margin: 0;
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  line-height: 1.2;
}

.tagline {
  max-width: 620px;
  margin: 0.75rem 0 0;
  color: #d9f1ed;
}

.page {
  padding-block: 2rem 3rem;
}

.intro,
.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.intro {
  padding: clamp(1.25rem, 4vw, 2rem);
}

.intro h1 {
  margin: 0;
  color: var(--primary-dark);
  font-size: clamp(1.7rem, 6vw, 2.45rem);
  line-height: 1.2;
}

.updated {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-weight: 600;
}

.card {
  margin-top: 1rem;
  padding: clamp(1.2rem, 4vw, 1.65rem);
}

.card h2 {
  margin: 0 0 0.7rem;
  color: var(--primary-dark);
  font-size: 1.3rem;
  line-height: 1.3;
}

.card h3 {
  margin: 1.25rem 0 0.35rem;
  font-size: 1.05rem;
}

.card p:last-child,
.card ul:last-child {
  margin-bottom: 0;
}

ul {
  padding-left: 1.35rem;
}

.button {
  display: inline-block;
  margin-top: 0.7rem;
  border-radius: 10px;
  background: var(--primary);
  color: #ffffff;
  padding: 0.7rem 1rem;
  font-weight: 700;
  text-decoration: none;
}

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

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
}

.footer-content {
  padding-block: 1.5rem;
  text-align: center;
}

@media (max-width: 480px) {
  .header-content,
  .page,
  .footer-content {
    width: min(100% - 1.25rem, 760px);
  }

  .header-content {
    padding-block: 2rem;
  }

  .page {
    padding-block: 1rem 2rem;
  }
}