:root {
  color-scheme: light;
  --ink: #17302b;
  --muted: #60726d;
  --line: #d7e2de;
  --paper: #fff;
  --wash: #f2f7f5;
  --accent: #087a67;
  --accent-dark: #056252;
  --accent-soft: #dff3ed;
  --warm: #f7f1e7;
  --shadow: 0 15px 42px rgba(28, 61, 53, .09);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--wash);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.8;
}

a { color: var(--accent-dark); }
a:hover { color: var(--accent); }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .96);
}

.header-inner,
.page,
.footer-inner {
  width: min(880px, calc(100% - 32px));
  margin-inline: auto;
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  color: var(--ink);
  font-weight: 800;
  letter-spacing: .03em;
  text-decoration: none;
}

.tool-link { font-size: .82rem; font-weight: 700; }

.page { padding: 30px 0 64px; }

.breadcrumb {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: .78rem;
}

.breadcrumb a { color: var(--muted); }

.article {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.article-hero {
  padding: 48px clamp(24px, 7vw, 64px) 40px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(145deg, #fff 0%, #edf8f4 100%);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .12em;
}

h1 {
  margin: 0;
  font-size: clamp(1.75rem, 5vw, 2.65rem);
  line-height: 1.4;
  letter-spacing: .02em;
}

.conclusion {
  margin: 22px 0 0;
  padding: 17px 19px;
  border-left: 4px solid var(--accent);
  border-radius: 0 9px 9px 0;
  background: #fff;
  font-size: 1.02rem;
  font-weight: 700;
}

.article-body { padding: 12px clamp(24px, 7vw, 64px) 52px; }

.content-section { padding-top: 34px; }
.content-section + .content-section { margin-top: 8px; }

h2 {
  margin: 0 0 14px;
  font-size: 1.35rem;
  line-height: 1.5;
}

h3 { margin: 0 0 6px; font-size: 1rem; }
p { margin: 0 0 16px; }

.point-list,
.avoid-list {
  margin: 0;
  padding-left: 1.4em;
}

.point-list li,
.avoid-list li { margin: 9px 0; }

.example {
  margin: 18px 0 0;
  padding: 24px;
  border: 1px solid #c9d9d4;
  border-radius: 12px;
  background: #fbfdfc;
}

.example-title {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .06em;
}

blockquote {
  margin: 0;
  color: #263b36;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  white-space: pre-line;
}

.caution-box {
  padding: 20px;
  border-radius: 11px;
  background: var(--warm);
}

.cta {
  margin-top: 42px;
  padding: 30px;
  border-radius: 14px;
  color: #fff;
  background: var(--ink);
  text-align: center;
}

.cta h2 { margin-bottom: 8px; color: #fff; }
.cta p { color: #d8e5e1; }

.cta-button {
  display: inline-block;
  margin-top: 4px;
  padding: 13px 21px;
  border-radius: 9px;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
  text-decoration: none;
}

.cta-button:hover { color: #fff; background: #0a917a; }

.faq-list { display: grid; gap: 12px; }

.faq-item {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.faq-item p { margin: 0; color: #40554f; }

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.related-list a {
  display: block;
  height: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--ink);
  font-size: .88rem;
  font-weight: 700;
  text-decoration: none;
}

.related-list a:hover { border-color: var(--accent); background: #f7fcfa; }

.disclaimer {
  margin-top: 34px;
  padding: 15px 17px;
  border-radius: 9px;
  color: var(--muted);
  background: var(--wash);
  font-size: .78rem;
}

.site-footer {
  padding: 25px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: #fff;
  font-size: .76rem;
  text-align: center;
}

.site-footer p { margin: 3px 0; }

@media (max-width: 600px) {
  .header-inner { min-height: 58px; }
  .tool-link { display: none; }
  .page { padding-top: 20px; }
  .article { border-radius: 13px; }
  .article-hero { padding-top: 34px; }
  .article-body { padding-bottom: 36px; }
  .conclusion { font-size: .94rem; }
  .example, .caution-box { padding: 18px; }
  .cta { padding: 24px 18px; }
  .related-list { grid-template-columns: 1fr; }
}