:root {
  color-scheme: light dark;
  --bg: #f8f7f4;
  --bg-top: #fcfbf9;
  --surface: #ffffff;
  --text: #132622;
  --muted: #4e635d;
  --border: #e2e6e3;
  --primary: #103f38;
  --primary-hover: #0c2f2a;
  --accent: #0f766e;
  --accent-soft: #eaf4f1;
  --shadow-soft: rgb(16 63 56 / 6%);
  --shadow-hover: rgb(16 63 56 / 12%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #091714;
    --bg-top: #0d1f1b;
    --surface: #112621;
    --text: #edf5f2;
    --muted: #91a8a2;
    --border: #1d3a33;
    --primary: #2dd4bf;
    --primary-hover: #5eead4;
    --accent: #34d399;
    --accent-soft: #16362e;
    --shadow-soft: rgb(0 0 0 / 25%);
    --shadow-hover: rgb(0 0 0 / 40%);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, var(--bg-top) 0, var(--bg) 260px),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.65;
}

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

a:hover {
  color: var(--primary-hover);
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  padding: 0.15em 0.4em;
  border-radius: 5px;
  background: var(--accent-soft);
  border: 1px solid var(--border);
}

.page {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.lang {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 2px 6px var(--shadow-soft);
  transition: all 120ms ease;
}

.lang:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.hero {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-bottom: 32px;
}

.mark {
  width: 72px;
  height: 72px;
  flex: 0 0 auto;
  border-radius: 18px;
  display: block;
  object-fit: cover;
  box-shadow: 0 8px 24px var(--shadow-soft);
  background: #103F38;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  color: var(--text);
}

.lead {
  margin: 12px 0 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 1.1rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.card {
  min-height: 136px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: inherit;
  text-decoration: none;
  box-shadow: 0 4px 12px var(--shadow-soft);
  transition: border-color 140ms ease, transform 140ms ease, box-shadow 140ms ease;
}

.card:hover {
  border-color: var(--primary);
  box-shadow: 0 12px 28px var(--shadow-hover);
  transform: translateY(-2px);
}

.card span {
  display: block;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
}

.card small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.document {
  max-width: 780px;
  margin: 24px auto 48px;
  padding: 36px 40px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: 0 16px 40px var(--shadow-soft);
}

@media (max-width: 640px) {
  .document {
    padding: 24px 20px;
  }
}

.back {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 2px 6px var(--shadow-soft);
  transition: all 120ms ease;
}

.back:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.updated {
  margin: 6px 0 24px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.toc {
  margin: 24px 0 32px;
  padding: 18px 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--accent-soft);
}

.toc h2 {
  margin: 0 0 10px;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.toc ul {
  margin: 0;
  padding-left: 20px;
}

.toc li {
  margin: 4px 0;
}

.toc a {
  text-decoration: none;
  font-size: 0.95rem;
}

.toc a:hover {
  text-decoration: underline;
}

h2 {
  margin: 36px 0 14px;
  font-size: 1.4rem;
  line-height: 1.25;
  color: var(--text);
  scroll-margin-top: 24px;
}

p {
  margin: 0 0 16px;
  color: var(--text);
}

ul {
  margin: 0 0 16px;
  padding-left: 24px;
}

li {
  margin: 6px 0;
}

@media print {
  body {
    background: #ffffff;
    color: #000000;
  }
  .topbar, .back, .lang {
    display: none;
  }
  .document {
    border: none;
    box-shadow: none;
    padding: 0;
  }
}