:root {
  color-scheme: light dark;
  --background: #f4f7f8;
  --surface: #ffffff;
  --text: #152128;
  --muted: #5f6d75;
  --border: #dce5e8;
  --accent: #0a7c72;
  --accent-dark: #075e57;
  --warning-bg: #fff7ed;
  --warning: #9a3412;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% -10%, rgba(10, 124, 114, 0.14), transparent 35rem),
    var(--background);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.65;
}

a { color: var(--accent-dark); }
a:hover { text-decoration-thickness: 2px; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 2;
}

.nav,
.page,
.site-footer {
  width: min(100% - 32px, 860px);
  margin-inline: auto;
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 850;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.nav-links { display: flex; flex-wrap: wrap; gap: 14px; }
.nav-links a { color: var(--muted); font-size: 0.9rem; text-decoration: none; }

.page { padding-block: 64px 44px; }

.eyebrow {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2 { line-height: 1.18; letter-spacing: -0.035em; }
h1 { margin: 10px 0 12px; font-size: clamp(2.1rem, 7vw, 3.6rem); }
h2 { margin: 0 0 10px; font-size: 1.3rem; }

.lead { max-width: 680px; margin: 0; color: var(--muted); font-size: 1.08rem; }
.updated { margin: 18px 0 32px; color: var(--muted); font-size: 0.9rem; }

.card {
  margin-block: 14px;
  padding: clamp(20px, 4vw, 30px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: 0 16px 44px rgba(20, 36, 43, 0.06);
}

.card p:last-child,
.card ul:last-child { margin-bottom: 0; }

.steps { padding-left: 1.35rem; }
.steps li { margin-block: 9px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  padding: 12px 18px;
  color: #ffffff;
  background: var(--accent);
  border-radius: 999px;
  font-weight: 760;
  text-decoration: none;
}

.notice {
  padding: 16px 18px;
  color: var(--warning);
  background: var(--warning-bg);
  border: 1px solid #fed7aa;
  border-radius: 16px;
}

.site-footer {
  padding-block: 22px 44px;
  color: var(--muted);
  font-size: 0.88rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #10181c;
    --surface: #182329;
    --text: #eef5f6;
    --muted: #aebdc2;
    --border: #2b3a40;
    --accent: #20a99c;
    --accent-dark: #79d8cf;
    --warning-bg: #351f13;
    --warning: #fdba74;
  }

  .card { box-shadow: 0 16px 44px rgba(0, 0, 0, 0.2); }
}

@media (max-width: 640px) {
  .nav { align-items: flex-start; flex-direction: column; padding-block: 14px; }
  .nav-links { gap: 10px 14px; }
  .page { padding-top: 42px; }
}