:root {
  color-scheme: light dark;
  --background: #f4f8f7;
  --surface: #ffffff;
  --text: #17211f;
  --secondary: #61706d;
  --border: #dce7e4;
  --accent: #168f83;
  --accent-soft: #e5f4f1;
  --warning: #9a4b22;
  --warning-soft: #fff2e9;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  line-height: 1.8;
}

a {
  color: var(--accent);
  text-underline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--background) 92%, transparent);
  backdrop-filter: blur(18px);
}

.header-inner,
.main,
.footer-inner {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 13px;
}

.nav a {
  color: var(--secondary);
  text-decoration: none;
}

.main {
  padding: 56px 0 80px;
}

.intro {
  max-width: 700px;
  margin-bottom: 36px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 7vw, 52px);
  line-height: 1.25;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 12px;
  font-size: 21px;
  letter-spacing: 0;
}

h3 {
  margin: 24px 0 6px;
  font-size: 16px;
}

p,
ul {
  margin: 0 0 16px;
}

ul {
  padding-left: 22px;
}

.lead {
  color: var(--secondary);
  font-size: 17px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.card,
.document {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 10px 28px rgba(24, 67, 61, 0.06);
}

.card {
  display: block;
  padding: 22px;
  color: var(--text);
  text-decoration: none;
}

.card:hover {
  border-color: var(--accent);
}

.card p {
  margin: 0;
  color: var(--secondary);
  font-size: 14px;
}

.document {
  padding: clamp(24px, 5vw, 52px);
}

.document section + section {
  margin-top: 34px;
  padding-top: 34px;
  border-top: 1px solid var(--border);
}

.meta,
.note {
  color: var(--secondary);
  font-size: 13px;
}

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
}

.warning {
  border-left-color: var(--warning);
  background: var(--warning-soft);
  color: var(--warning);
}

.button {
  display: inline-block;
  min-height: 44px;
  padding: 9px 18px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--secondary);
  font-size: 12px;
}

.footer-inner {
  padding: 24px 0 40px;
}

@media (max-width: 720px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
    gap: 8px;
  }

  .main {
    padding-top: 38px;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #101514;
    --surface: #181f1e;
    --text: #f3f7f6;
    --secondary: #a6b3b0;
    --border: #2b3735;
    --accent: #42b9aa;
    --accent-soft: #173b37;
    --warning: #ffad7d;
    --warning-soft: #3b251b;
  }

  .card,
  .document {
    box-shadow: none;
  }
}