:root {
  --bg-a: #f6f8ff;
  --bg-b: #eef7f1;
  --surface: #ffffff;
  --text: #122230;
  --muted: #4d6170;
  --line: #d6e1e8;
  --accent: #006a7a;
  --accent-soft: #e2f3f6;
  --shadow: rgba(23, 40, 60, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: "Avenir Next", "Helvetica Neue", "Noto Sans", sans-serif;
  color: var(--text);
  background: linear-gradient(145deg, var(--bg-a), var(--bg-b));
}

html {
  color-scheme: light dark;
}

a {
  color: var(--accent);
  text-underline-offset: 2px;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px 20px 72px;
}

.hero {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
  background: radial-gradient(circle at top right, var(--accent-soft), var(--surface) 55%);
  box-shadow: 0 8px 24px var(--shadow);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.brand h1 {
  margin: 0;
  font-size: 2.1rem;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
}

.tag {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 75%, var(--accent-soft));
  color: var(--accent);
  padding: 6px 12px;
  font-size: 0.85rem;
}

.lang {
  margin-top: 14px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.lang a {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 11px;
  text-decoration: none;
  background: var(--surface);
}

.grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  padding: 14px;
}

.card h2,
.card h3 {
  margin-top: 0;
}

.list {
  margin: 0;
  padding-left: 18px;
  line-height: 1.55;
}

.muted {
  color: var(--muted);
}

.callout {
  margin-top: 16px;
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: color-mix(in srgb, var(--surface) 82%, var(--accent-soft));
  padding: 10px 12px;
}

.footer {
  margin-top: 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 16px 0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-a: #0c1520;
    --bg-b: #111b2a;
    --surface: #132433;
    --text: #e4edf5;
    --muted: #a7c0d2;
    --line: #2f4758;
    --accent: #7ad8e4;
    --accent-soft: #163443;
    --shadow: rgba(0, 0, 0, 0.34);
  }

  a {
    color: #8be3ef;
  }

  .lang a:hover,
  .lang a:focus-visible {
    outline: none;
    border-color: #73d5e1;
  }
}

@media (max-width: 780px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .brand h1 {
    font-size: 1.75rem;
  }
}