:root {
  color-scheme: light;
  --background: #f4f7fb;
  --surface: #ffffff;
  --surface-soft: #edf6ff;
  --text: #172033;
  --muted: #5d687c;
  --line: #dce4ef;
  --accent: #1769aa;
  --accent-dark: #0f4f82;
  --highlight: #e7f4ff;
  --shadow: 0 18px 48px rgba(25, 55, 90, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top right, rgba(129, 205, 255, 0.2), transparent 32rem),
    var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

a {
  color: var(--accent-dark);
}

.site-header {
  border-bottom: 1px solid rgba(220, 228, 239, 0.9);
  background: rgba(244, 247, 251, 0.92);
}

.header-inner,
main,
.site-footer {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 11px;
  background: linear-gradient(145deg, #2c8bc8, #135c98);
  color: #ffffff;
  font-size: 14px;
  letter-spacing: -0.04em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.header-link,
.language-link {
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

main {
  padding: 72px 0 64px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.3;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(34px, 7vw, 60px);
  letter-spacing: -0.035em;
}

.lead {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2.5vw, 21px);
}

.meta {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.summary,
.hero-card {
  margin-top: 36px;
  padding: 24px;
  border: 1px solid #cce5f8;
  border-radius: 18px;
  background: var(--highlight);
}

.summary strong {
  display: block;
  margin-bottom: 6px;
}

.content {
  display: grid;
  gap: 20px;
  margin-top: 40px;
}

section {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

section h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 3vw, 28px);
  letter-spacing: -0.02em;
}

section h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

section p,
section ul {
  margin: 12px 0 0;
}

section ul {
  padding-left: 1.35em;
}

section li + li {
  margin-top: 7px;
}

.feature-grid,
.data-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.feature-card,
.tip-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-soft);
}

.feature-card p,
.tip-card p {
  margin: 0;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 10px 18px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 750;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--accent-dark);
}

.note {
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  background: var(--surface-soft);
  color: var(--muted);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding: 0 0 40px;
  color: var(--muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

code {
  border-radius: 5px;
  padding: 2px 5px;
  background: #e9eef5;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

@media (max-width: 700px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  main {
    padding-top: 48px;
  }

  .feature-grid,
  .data-grid {
    grid-template-columns: 1fr;
  }

  section {
    padding: 22px;
  }
}