* { box-sizing: border-box; }
body {
  margin: 0;
  color: #374151;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.9;
  background: #eefaf7;
}
.page {
  width: min(100%, 940px);
  margin: 0 auto;
  background: #fff;
  border-left: 1px solid #cbe7df;
  border-right: 1px solid #cbe7df;
  box-shadow: 0 0 18px rgba(71, 128, 119, .16);
}
header {
  padding: 18px;
  background: linear-gradient(#fff, #e7faf6);
  border-bottom: 4px solid #84d7c8;
}
.brand {
  color: #23675f;
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 900;
  line-height: 1.25;
  text-decoration: none;
}
.tagline {
  margin: 4px 0 0;
  color: #4f6f69;
  font-size: 14px;
  font-weight: 700;
}
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
nav a {
  padding: 7px 10px;
  color: #fff;
  background: #5bbfb2;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}
main { padding: 18px; }
.breadcrumb {
  margin: 0 0 12px;
  color: #6f7c79;
  font-size: 12px;
}
.breadcrumb a { color: #24746b; }
.article-header {
  padding: 18px;
  border: 1px solid #cfe9e3;
  background: linear-gradient(135deg, #ffffff, #f1fffb);
}
.label {
  display: inline-block;
  margin-bottom: 8px;
  padding: 4px 9px;
  color: #fff;
  background: #ee7892;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
}
h1 {
  margin: 0 0 10px;
  color: #24746b;
  font-size: clamp(27px, 5vw, 42px);
  line-height: 1.35;
  letter-spacing: 0;
}
.article-header h1 { margin-bottom: 0; }
.lead {
  margin: 12px 0 0;
  color: #4f5f5b;
  font-size: 16px;
  font-weight: 700;
}
.meta {
  margin: 10px 0 0;
  color: #6f7c79;
  font-size: 13px;
}
.hero-img {
  margin: 16px 0 0;
  border: 1px solid #cfe9e3;
  background: #f7fffd;
  overflow: hidden;
}
.hero-img img {
  display: block;
  width: 100%;
  height: auto;
}
.hero-img figcaption {
  padding: 7px 10px;
  color: #6f7c79;
  background: #fbfffe;
  border-top: 1px solid #d6eee8;
  font-size: 12px;
}
.summary,
.lead-box {
  margin-top: 18px;
  padding: 14px;
  border: 2px solid #a8dfd5;
  background: #f7fffd;
  font-weight: 700;
}
.toc {
  margin-top: 16px;
  padding: 14px;
  border: 1px solid #d6eee8;
  background: #fff;
}
.toc strong {
  display: block;
  margin-bottom: 6px;
  color: #24746b;
  background: none;
}
.toc ol {
  margin: 0;
  padding-left: 22px;
}
section {
  margin-top: 20px;
  padding: 16px;
  border: 1px solid #cfe9e3;
  background: #fff;
}
h2 {
  margin: 0 0 10px;
  padding-left: 10px;
  color: #24746b;
  border-left: 4px solid #74d3c3;
  font-size: 23px;
  line-height: 1.45;
  letter-spacing: 0;
}
h3 {
  margin: 18px 0 8px;
  color: #1f4f4a;
  font-size: 18px;
  line-height: 1.5;
}
p { margin-top: 0; }
strong {
  color: #1f2937;
  font-weight: 900;
  background: linear-gradient(transparent 58%, #fff1a8 58%);
}
ul { padding-left: 22px; }
.note-box {
  margin: 14px 0;
  padding: 12px;
  border-left: 5px solid #ffd5df;
  background: #fff9fb;
}
.check-list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}
.check-list li {
  margin-bottom: 7px;
  padding: 8px 10px 8px 30px;
  border: 1px solid #d6eee8;
  background: #fbfffe;
  position: relative;
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 10px;
  color: #e6788f;
  font-weight: 900;
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 14px;
}
.compare-table th,
.compare-table td {
  padding: 9px;
  border: 1px solid #d6eee8;
  vertical-align: top;
  text-align: left;
}
.compare-table th {
  color: #24746b;
  background: #f1fffb;
  white-space: nowrap;
}
.author-mini {
  margin-top: 18px;
  padding: 13px;
  border: 1px solid #d6eee8;
  background: #fbfffe;
  font-size: 14px;
}
.category {
  margin-top: 18px;
  border: 1px solid #cfe9e3;
  background: #fff;
}
.category h2 {
  margin: 0;
  padding: 9px 12px;
  color: #fff;
  background: linear-gradient(#74d3c3, #44afa4);
  border: 0;
  border-bottom: 3px solid #ffd5df;
  font-size: 22px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 14px;
}
.card {
  display: block;
  padding: 14px;
  color: inherit;
  border: 1px solid #d6eee8;
  background: #fbfffe;
  text-decoration: none;
}
.card strong {
  display: block;
  color: #24746b;
  background: none;
  font-size: 18px;
  line-height: 1.45;
}
.card span {
  display: block;
  margin-top: 6px;
  color: #5f756f;
  font-size: 13px;
}
.cta {
  margin-top: 20px;
  padding: 18px;
  border: 2px solid #a8dfd5;
  background: #f7fffd;
  text-align: center;
}
.cta p {
  margin: 0 0 10px;
  font-weight: 900;
}
.cta a {
  display: inline-block;
  padding: 11px 20px;
  color: #fff;
  background: #ee7892;
  border-radius: 8px;
  box-shadow: 0 3px 0 #cf5a74;
  font-weight: 900;
  text-decoration: none;
}
.related a,
footer a {
  color: #24746b;
  font-weight: 700;
}
footer {
  padding: 18px;
  color: #6f7c79;
  background: #f1fffb;
  border-top: 1px solid #cfe9e3;
  font-size: 12px;
  text-align: center;
}
@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  main { padding: 12px; }
  .article-header { padding: 14px; }
  nav a {
    flex: 1 1 auto;
    text-align: center;
  }
  .compare-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}