:root {
  color-scheme: light dark;
  --bg: #f4f7f4;
  --surface: #ffffff;
  --text: #17231e;
  --muted: #5f6f67;
  --primary: #087a54;
  --primary-soft: #d9f2e7;
  --line: #dce5df;
  --warning: #fff2d7;
  --warning-text: #78520b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

header {
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  backdrop-filter: blur(16px);
  z-index: 2;
}

.nav {
  max-width: 860px;
  margin: auto;
  min-height: 64px;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand { font-size: 20px; font-weight: 800; color: var(--text); text-decoration: none; }
.nav-links { display: flex; flex-wrap: wrap; gap: 14px; }
.nav-links a { color: var(--muted); font-size: 14px; text-decoration: none; }
.nav-links a:hover { color: var(--primary); }

main { max-width: 760px; margin: 0 auto; padding: 54px 22px 72px; }
h1 { font-size: clamp(32px, 6vw, 48px); line-height: 1.08; margin: 0 0 14px; letter-spacing: -0.035em; }
h2 { font-size: 23px; line-height: 1.25; margin: 40px 0 10px; }
h3 { font-size: 17px; margin: 0 0 5px; }
p { margin: 0 0 15px; }
.lead { color: var(--muted); font-size: 18px; max-width: 650px; }
.date { color: var(--muted); font-size: 14px; margin-top: 12px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; margin: 18px 0; box-shadow: 0 10px 32px rgba(12, 50, 35, .05); }
.notice { background: var(--warning); color: var(--warning-text); border: 0; }
.safe { background: var(--primary-soft); color: #095d43; border: 0; }
.steps { counter-reset: step; display: grid; gap: 12px; margin: 18px 0; }
.step { counter-increment: step; display: grid; grid-template-columns: 34px 1fr; gap: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 16px; }
.step::before { content: counter(step); display: grid; place-items: center; width: 30px; height: 30px; background: var(--primary-soft); color: var(--primary); border-radius: 10px; font-weight: 800; }
.step p { color: var(--muted); margin: 0; }
ul { padding-left: 22px; }
li { margin: 7px 0; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 18px; border-radius: 14px; background: var(--primary); color: white; font-weight: 750; text-decoration: none; }
.button.secondary { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0; }
footer { color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); padding-top: 22px; margin-top: 48px; }
code { background: var(--primary-soft); color: var(--primary); padding: 2px 6px; border-radius: 6px; }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07120e;
    --surface: #101d17;
    --text: #e6f0eb;
    --muted: #a6b7ae;
    --primary: #63d6aa;
    --primary-soft: #123f30;
    --line: #283a31;
    --warning: #3d2e0e;
    --warning-text: #f5d796;
  }
  .safe { color: #a9eed2; }
}

@media (max-width: 620px) {
  .nav { align-items: flex-start; flex-direction: column; }
  main { padding-top: 36px; }
}