:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #162033;
  --muted: #53627a;
  --primary: #0f62fe;
  --line: #d9e1ef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141d;
    --card: #171f2d;
    --text: #ebf0fa;
    --muted: #a8b4c8;
    --primary: #6ea8ff;
    --line: #2a3548;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(circle at 10% 10%, rgba(15, 98, 254, 0.12), transparent 45%), var(--bg);
  color: var(--text);
  line-height: 1.65;
}

.container {
  width: min(980px, 92vw);
  margin: 0 auto;
  padding: 28px 0 56px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  margin-top: 16px;
}

h1,
h2,
h3 {
  line-height: 1.35;
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
}

h2 {
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  margin-top: 6px;
}

p,
li {
  color: var(--text);
  margin: 0 0 10px;
}

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

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.lang-switch {
  display: flex;
  gap: 10px;
  margin-top: 8px;
  margin-bottom: 8px;
}

.lang-switch a {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.lang-title {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 10px;
}

a.btn {
  display: inline-block;
  text-decoration: none;
  color: white;
  background: var(--primary);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
}

a.btn.secondary {
  color: var(--text);
  background: transparent;
  border: 1px solid var(--line);
}

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

.tag {
  display: inline-block;
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.85rem;
  margin-right: 6px;
  margin-bottom: 8px;
}

.small {
  font-size: 0.93rem;
}

footer {
  margin-top: 26px;
  color: var(--muted);
  font-size: 0.9rem;
}