:root {
  --page: oklch(13% 0.008 305);
  --surface: oklch(19% 0.014 305);
  --ink: oklch(96% 0.008 305);
  --ink-soft: oklch(86% 0.012 305);
  --muted: oklch(66% 0.012 305);
  --line: oklch(32% 0.014 305);
  --brand: oklch(64% 0.19 305);
  --brand-deep: oklch(56% 0.2 305);
  --shadow-button: 0 4px 16px oklch(64% 0.19 305 / 0.35);
}

@media (prefers-color-scheme: light) {
  :root {
    --page: oklch(96.7% 0 0);
    --surface: #ffffff;
    --ink: oklch(18% 0.012 305);
    --ink-soft: oklch(28% 0.013 305);
    --muted: oklch(50% 0.013 305);
    --line: oklch(88% 0.008 305);
    --brand: oklch(50% 0.215 305);
    --brand-deep: oklch(44% 0.2 305);
    --shadow-button: 0 4px 16px oklch(50% 0.215 305 / 0.35);
  }
}

html[data-lang='uk'] [lang='en'],
html[data-lang='en'] [lang='uk'] {
  display: none;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

.brand img {
  width: 30px;
  height: 30px;
}

.lang-toggle {
  display: flex;
  gap: 0.25rem;
  padding: 0.2rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.lang-toggle button {
  min-width: 2.6rem;
  padding: 0.3rem 0.6rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.lang-toggle button[aria-pressed='true'] {
  background: var(--brand);
  color: #fff;
}

.hero {
  padding: 2rem 0 1rem;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.hero p {
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
}

.hero-cta {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-button);
}

h2 {
  margin: 2.5rem 0 1rem;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

.steps {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--ink-soft);
}

.steps li {
  margin-bottom: 0.6rem;
}

.card {
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--ink-soft);
}

.doc h1 {
  margin: 1.5rem 0 0.25rem;
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.doc h2 {
  font-size: 1.15rem;
}

.doc ul {
  padding-left: 1.2rem;
}

.doc li {
  margin-bottom: 0.5rem;
}

.doc h3 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1rem;
}

.doc p,
.doc li {
  color: var(--ink-soft);
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}

.doc th,
.doc td {
  padding: 0.6rem 0.5rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  color: var(--ink-soft);
}

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

a {
  color: var(--brand);
}

.site-footer {
  margin-top: 3.5rem;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-size: 0.92rem;
}