:root {
  --bg: #04141a;
  --bg-soft: #082530;
  --surface: #0c2f3c;
  --text: #e8f4f6;
  --text-dim: #9fc2c9;
  --accent: #4fd1c5;
  --border: rgba(159, 194, 201, 0.18);
  --maxw: 720px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  padding: 40px 24px 8px;
  max-width: var(--maxw);
  margin: 0 auto;
}

.brand {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
}

.brand .dot {
  color: var(--accent);
}

.tagline {
  color: var(--text-dim);
  margin-top: 4px;
  font-size: 15px;
}

nav.top {
  margin-top: 20px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 15px;
}

h1 {
  font-size: 30px;
  font-weight: 600;
  margin: 8px 0 4px;
}

h2 {
  font-size: 21px;
  font-weight: 600;
  margin: 36px 0 8px;
  color: var(--text);
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 6px;
}

p,
ul,
ol {
  color: var(--text);
}

ul,
ol {
  padding-left: 22px;
}

li {
  margin: 4px 0;
}

.muted {
  color: var(--text-dim);
  font-size: 14px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 28px;
  margin: 20px 0;
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin: 20px 0 8px;
}

.lang-toggle button {
  background: transparent;
  color: var(--text-dim);
  border: 0;
  padding: 8px 20px;
  font-size: 15px;
  cursor: pointer;
  font-family: inherit;
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--accent);
  color: #04141a;
  font-weight: 600;
}

[data-lang-section] {
  display: none;
}

[data-lang-section].active {
  display: block;
}

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 64px;
  padding: 28px 24px 64px;
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
  color: var(--text-dim);
  font-size: 14px;
}

footer.site a {
  color: var(--text-dim);
}

.btn-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 22px;
  color: var(--text);
  font-weight: 600;
  min-width: 200px;
}

.btn:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.btn .sub {
  display: block;
  font-weight: 400;
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 2px;
}