:root {
  --bg: #f7f5f2;
  --surface: #ffffff;
  --text: #1c1917;
  --muted: #57534e;
  --border: #e7e5e4;
  --accent: #5b4b8a;
  --accent-soft: #f0ecf8;
  --max: 42rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    "Yu Gothic", YuGothic, Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: linear-gradient(180deg, #faf8f5 0%, var(--bg) 40%, #efeae3 100%);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-thickness: 2px;
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.site-header {
  margin-bottom: 2rem;
}

.brand {
  display: inline-block;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
  text-decoration: none;
}

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

.hero {
  margin: 3rem 0 2.5rem;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 8vw, 2.75rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.card-list {
  display: grid;
  gap: 0.875rem;
  margin: 0 0 2.5rem;
  padding: 0;
  list-style: none;
}

.card-list a {
  display: block;
  padding: 1.125rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(28, 25, 23, 0.03);
}

.card-list a:hover {
  border-color: #d6d0e8;
  background: var(--accent-soft);
}

.card-list strong {
  display: block;
  font-size: 1.05rem;
}

.card-list span {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.contact {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
}

.contact h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.contact p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.doc-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.doc-header h1 {
  margin: 0.5rem 0 0.75rem;
  font-size: clamp(1.6rem, 6vw, 2rem);
  line-height: 1.3;
}

.doc-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.nav-back {
  display: inline-block;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
  text-decoration: none;
}

.nav-back:hover {
  text-decoration: underline;
}

article section {
  margin: 0 0 1.75rem;
}

article h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  line-height: 1.4;
}

article h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
}

article p,
article li {
  color: var(--text);
}

article ul,
article ol {
  margin: 0.5rem 0 0.75rem;
  padding-left: 1.25rem;
}

article li + li {
  margin-top: 0.35rem;
}

.note {
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  border-left: 3px solid #c4b5e0;
  border-radius: 0 10px 10px 0;
  background: var(--accent-soft);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-bottom: 0.75rem;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}