:root {
  --bg: #fbfaf6;
  --ink: #1f2a24;
  --muted: #5d6b63;
  --accent: #1d6b5a;
  --accent-soft: #e3efe9;
  --warm: #b8532c;
  --line: #dcd9cc;
  --card: #ffffff;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 17px;
  line-height: 1.85;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

/* header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 16px;
  padding-bottom: 14px;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-decoration: none;
}
.site-nav { display: flex; gap: 20px; font-size: 0.92rem; }
.site-nav a { color: var(--ink); text-decoration: none; }
.site-nav a:hover { color: var(--accent); text-decoration: underline; }

/* typography */
main { padding: 36px 0 24px; }

h1 {
  font-size: 1.65rem;
  line-height: 1.5;
  margin: 0 0 20px;
}
h2 {
  font-size: 1.28rem;
  line-height: 1.5;
  margin: 44px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
h3 { font-size: 1.05rem; margin: 28px 0 8px; }

p { margin: 0 0 16px; }
a { color: var(--accent); }

.lead {
  font-size: 1.12rem;
  line-height: 1.8;
  padding: 18px 20px;
  background: var(--accent-soft);
  border-radius: 8px;
  margin: 0 0 28px;
}
.lead p:last-child { margin-bottom: 0; }

.answer-box {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 0 0 28px;
}
.answer-box dt {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.9rem;
  margin-top: 10px;
}
.answer-box dt:first-child { margin-top: 0; }
.answer-box dd { margin: 2px 0 0; }

/* placeholder marker */
.todo {
  background: #fff3c4;
  border-bottom: 1px dashed #c9a400;
  padding: 0 3px;
}

/* tables */
.table-scroll { overflow-x: auto; margin: 0 0 24px; }
table {
  border-collapse: collapse;
  width: 100%;
  min-width: 520px;
  background: var(--card);
  font-size: 0.95rem;
  line-height: 1.6;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: var(--accent-soft); font-weight: 700; }
td.num, th.num { text-align: right; white-space: nowrap; }

ul, ol { padding-left: 1.4em; margin: 0 0 16px; }
li { margin-bottom: 6px; }

/* article list */
.article-list { list-style: none; padding: 0; margin: 0 0 16px; }
.article-list li {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  margin: 0;
}
.article-list a { font-weight: 700; text-decoration: none; }
.article-list a:hover { text-decoration: underline; }
.article-list .meta { display: block; font-size: 0.88rem; color: var(--muted); }

/* FAQ */
.faq-item { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq-item h2 { border: 0; padding: 0; margin: 0 0 8px; font-size: 1.08rem; }
.faq-item p { margin: 0; }

/* byline */
.byline {
  margin: 36px 0 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  font-size: 0.93rem;
  line-height: 1.7;
}
.byline strong { font-size: 1rem; }
.updated { color: var(--muted); font-size: 0.88rem; margin: 10px 0 0; }

/* newsletter */
.newsletter {
  margin: 40px 0 0;
  padding: 24px 20px;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
}
.newsletter h2 {
  border: 0;
  padding: 0;
  margin: 0 0 8px;
  font-size: 1.12rem;
  color: #fff;
}
.newsletter p { margin: 0 0 16px; }
.btn {
  display: inline-block;
  background: #fff;
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 6px;
}
.btn:hover { background: var(--accent-soft); }

/* footer */
.site-footer {
  margin-top: 48px;
  padding: 24px 0 40px;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--muted);
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  h1 { font-size: 1.45rem; }
  main { padding-top: 24px; }
}