:root {
  --paper: #fff8e3;
  --paper2: #f7ecc8;
  --ink: #2a2520;
  --ink-soft: #6f6a5f;
  --ink-faint: #b1ac9f;
  --line: #e6d8b0;
  --line-faint: #efe5c4;
  --walk: #92c852;
  --walk-deep: #7caf3a;
  --walk-soft: #ddedc6;
  --accent: #5bb0e3;
  --warn: #d24a38;
  --warn-bg: #fbeed5;
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  font-size: 15px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  opacity: 0.8;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px max(20px, calc((100% - 720px) / 2));
  background: var(--paper2);
  border-bottom: 1px solid var(--line);
}

.site-header .brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  font-family: "Zen Maru Gothic", "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.site-header nav a {
  color: var(--ink-soft);
  font-weight: 500;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.hero {
  text-align: center;
  padding: 48px 0 8px;
}

.hero .brand-mark {
  display: inline-block;
  font-size: 32px;
  margin-bottom: 20px;
}

.hero p.lead {
  color: var(--ink-soft);
  font-size: 17px;
  margin: 0 auto;
  max-width: 480px;
}

.card-links {
  display: grid;
  gap: 12px;
  margin-top: 32px;
}

.card-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.card-links a:hover {
  border-color: var(--walk-deep);
  opacity: 1;
  background: var(--walk-soft);
}

.card-links a .arrow {
  color: var(--ink-faint);
  font-weight: 400;
}

.doc {
  font-size: 13px;
}

.doc h1 {
  font-family: "Zen Maru Gothic", "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: 21px;
  margin: 0 0 4px;
}

.doc .dates {
  color: var(--ink-soft);
  font-size: 13px;
  margin: 0 0 32px;
}

.doc h2 {
  font-family: "Zen Maru Gothic", "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: 16px;
  margin: 40px 0 14px;
  padding-top: 4px;
  border-top: 1px solid var(--line);
}

.doc h2:first-of-type {
  border-top: none;
  margin-top: 24px;
}

.doc p {
  margin: 0 0 14px;
}

.doc ul,
.doc ol {
  margin: 0 0 14px;
  padding-left: 1.4em;
}

.doc li {
  margin-bottom: 6px;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 13px;
}

.doc th,
.doc td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.doc th {
  background: var(--paper2);
  font-weight: 700;
}

.doc .notice {
  background: var(--warn-bg);
  border: 1px solid var(--warn);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 28px;
}

.site-footer {
  text-align: center;
  padding: 32px 20px 48px;
  color: var(--ink-faint);
  font-size: 13px;
}

.site-footer a {
  color: var(--ink-soft);
}

@media (max-width: 480px) {
  .site-header {
    padding: 16px 20px;
  }
  .site-header nav {
    gap: 14px;
  }
  main {
    padding: 24px 18px 64px;
  }
}