@import url('https://fonts.googleapis.com/css2?family=Zen+Kaku+Gothic+New:wght@500;700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root{
  --bg: #f6f5f1;
  --panel: #fffefb;
  --ink: #1c2430;
  --ink-soft: #4a5566;
  --copper: #b5652d;
  --copper-deep: #8f4d20;
  --line: #d8d3c6;
  --wire-blue: #2c5f66;
  --max: 760px;
}

*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .brand{
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-weight: 700;
  letter-spacing: 0.01em;
}

a{ color: var(--copper-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover{ color: var(--copper); }
a:focus-visible, button:focus-visible{ outline: 2px solid var(--wire-blue); outline-offset: 3px; }

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

header.site{
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
header.site .bar{
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand{
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand svg{ flex: none; }
nav.site a{
  color: var(--ink-soft);
  font-size: 14px;
  margin-left: 22px;
  text-decoration: none;
}
nav.site a:hover{ color: var(--copper-deep); }

main{ padding: 64px 0 96px; }

.eyebrow{
  color: var(--copper-deep);
  font-size: 13px;
  font-weight: 500;
  margin: 0 0 10px;
}

h1{ font-size: 30px; line-height: 1.5; margin: 0 0 20px; }
h2{ font-size: 20px; margin: 48px 0 16px; padding-top: 8px; border-top: 1px solid var(--line); }
h2:first-of-type{ border-top: none; padding-top: 0; margin-top: 8px; }
h3{ font-size: 16px; margin: 24px 0 8px; }

p{ margin: 0 0 16px; color: var(--ink); }
.lede{ font-size: 17px; color: var(--ink-soft); max-width: 60ch; }

ul{ padding-left: 1.3em; margin: 0 0 16px; }
li{ margin-bottom: 6px; }

table.info{
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 8px;
  font-size: 15px;
}
table.info th, table.info td{
  text-align: left;
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.info th{
  width: 34%;
  color: var(--ink-soft);
  font-weight: 500;
  padding-right: 16px;
}

.card{
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 24px 26px;
  margin: 28px 0;
}

.hero-mark{ margin: 4px 0 28px; }

.diagram{ display: block; margin: 40px auto 8px; opacity: 0.9; }

footer.site{
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
}
footer.site .wrap{ font-size: 13px; color: var(--ink-soft); }
footer.site a{ color: var(--ink-soft); }

@media (max-width: 560px){
  header.site .bar{ padding: 18px 20px; }
  nav.site a{ margin-left: 16px; }
  main{ padding: 44px 0 72px; }
  h1{ font-size: 24px; }
}