:root {
  --bg: #f6f8f3;
  --surface: #ffffff;
  --surface-alt: #eef3ea;
  --text: #181d18;
  --text-muted: #4b574b;
  --accent: #245e46;
  --accent-soft: #d9efe4;
  --border: #d8e2d5;
  --warn-bg: #fff5e8;
  --warn-border: #edd2a4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1410;
    --surface: #171d18;
    --surface-alt: #1f2720;
    --text: #e9efe9;
    --text-muted: #a8b5a8;
    --accent: #6cd6a4;
    --accent-soft: #1a382a;
    --border: #2a342b;
    --warn-bg: #2a2113;
    --warn-border: #5a4420;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 28px 20px 56px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.brand-badge {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.nav a,
.lang-btn {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
}

.nav a.active,
.lang-btn.active {
  background: var(--accent-soft);
  border-color: transparent;
  color: var(--accent);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
}

h1 {
  margin: 0 0 8px;
  font-size: 1.85rem;
  line-height: 1.25;
}

.meta {
  margin: 0 0 22px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

h2 {
  margin: 26px 0 8px;
  font-size: 1.18rem;
  line-height: 1.35;
}

p {
  margin: 0 0 12px;
}

ul {
  margin: 0 0 14px;
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

.notice {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: 14px;
  padding: 14px 16px;
  margin: 16px 0;
  font-size: 0.95rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.tile {
  background: var(--surface-alt);
  border-radius: 14px;
  padding: 16px;
}

.tile strong {
  display: block;
  margin-bottom: 4px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 12px;
  font-weight: 600;
  background: var(--accent);
  color: #ffffff;
}

@media (prefers-color-scheme: dark) {
  .btn {
    color: #0b1a12;
  }
}

.btn-secondary {
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
}

.footer {
  margin-top: 24px;
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
}

[data-lang="en"] {
  display: none;
}

body.lang-en [data-lang="uk"] {
  display: none;
}

body.lang-en [data-lang="en"] {
  display: block;
}

@media (max-width: 540px) {
  .card {
    padding: 20px;
    border-radius: 16px;
  }

  h1 {
    font-size: 1.5rem;
  }
}