:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --fg: #1f2328;
  --muted: #5f6670;
  --line: #e6e3dc;
  --accent: #0b6b4f;
  --accent-soft: #e6f2ed;
  --rakuten: #bf0000;
  --amazon: #ff9900;
  --amazon-fg: #1f2328;
  --shadow: 0 1px 2px rgba(31, 35, 40, .06), 0 4px 16px rgba(31, 35, 40, .05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --surface: #1a1d22;
    --fg: #e8e8e8;
    --muted: #9aa0a6;
    --line: #2b2f36;
    --accent: #4fd1a5;
    --accent-soft: #17302a;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
               "Noto Sans JP", "Yu Gothic", "Segoe UI", sans-serif;
  line-height: 1.9;
  font-size: 16px;
  letter-spacing: .02em;
}
a { color: var(--accent); text-underline-offset: 3px; }
img { max-width: 100%; }

/* ---------- header / footer ---------- */
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.site-header .inner {
  max-width: 1080px; margin: 0 auto; padding: 14px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; }
.brand .mark {
  width: 34px; height: 34px; border-radius: 9px; background: var(--accent);
  color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 15px;
}
.brand .name { font-weight: 800; font-size: 1.05rem; letter-spacing: .04em; }
.brand .tag { display: block; font-size: .72rem; color: var(--muted); font-weight: 400; line-height: 1.3; }
.site-nav { display: flex; gap: 16px; font-size: .88rem; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--accent); }
.site-footer { margin-top: 64px; background: var(--surface); border-top: 1px solid var(--line); }
.site-footer .inner { max-width: 1080px; margin: 0 auto; padding: 28px 16px 40px;
  color: var(--muted); font-size: .82rem; line-height: 1.8; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 14px; }
.site-footer nav a { color: var(--fg); text-decoration: none; }
.site-footer p { margin: 4px 0; }

/* ---------- layout ---------- */
.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.article-wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

/* ---------- top page ---------- */
.hero { padding: 48px 0 28px; }
.hero h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); line-height: 1.4; margin: 0 0 12px; letter-spacing: .03em; }
.hero p { color: var(--muted); margin: 0; max-width: 640px; }
.points { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px; margin: 24px 0 8px; padding: 0; list-style: none; }
.points li { background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 16px; font-size: .9rem; line-height: 1.7; }
.points b { display: block; color: var(--accent); font-size: .95rem; margin-bottom: 2px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between;
  margin: 36px 0 14px; gap: 12px; }
.section-head h2 { margin: 0; font-size: 1.2rem; }
.section-head a { font-size: .88rem; white-space: nowrap; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.card {
  display: flex; flex-direction: column; gap: 8px;
  padding: 18px 18px 16px; border: 1px solid var(--line); border-radius: 14px;
  text-decoration: none; color: var(--fg); background: var(--surface); box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card .t { font-weight: 700; line-height: 1.55; font-size: 1rem; }
.card .d { color: var(--muted); font-size: .86rem; line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card .foot { margin-top: auto; display: flex; gap: 8px; align-items: center;
  font-size: .78rem; color: var(--muted); }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .74rem;
  font-weight: 700; background: var(--accent-soft); color: var(--accent); line-height: 1.7; }
.badge.value { background: #fff1e0; color: #a35a00; }
.badge.reviewed { background: #eaf0ff; color: #2f55c4; }
.badge.premium { background: #f3ebff; color: #6b3fb8; }
@media (prefers-color-scheme: dark) {
  .badge.value, .badge.reviewed, .badge.premium { background: #23272e; }
  .badge.value { color: #ffb366; } .badge.reviewed { color: #8fb0ff; } .badge.premium { color: #c4a5ff; }
}
.empty { color: var(--muted); padding: 24px 0; }

/* ---------- article ---------- */
.crumbs { font-size: .8rem; color: var(--muted); margin: 22px 0 0; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.article-head { margin: 10px 0 24px; }
.article-head h1 { font-size: clamp(1.45rem, 3.6vw, 1.9rem); line-height: 1.5; margin: 10px 0 12px; }
.article-head .meta { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center;
  color: var(--muted); font-size: .82rem; }
article.post { background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  padding: 8px clamp(18px, 4vw, 40px) 32px; box-shadow: var(--shadow); }
article.post h2 { font-size: 1.22rem; line-height: 1.5; margin: 44px 0 14px; padding: 4px 0 4px 14px;
  border-left: 4px solid var(--accent); }
article.post p { margin: 0 0 1.1em; }
article.post ul { padding-left: 1.3em; }
article.post li { margin: 6px 0; }
article.post table { width: 100%; border-collapse: collapse; font-size: .88rem; margin: 12px 0 20px;
  display: block; overflow-x: auto; }
article.post th, article.post td { border: 1px solid var(--line); padding: 8px 10px; text-align: left;
  vertical-align: top; }
article.post th { background: var(--accent-soft); white-space: nowrap; }
article.post hr { border: 0; border-top: 1px solid var(--line); margin: 36px 0 16px; }
article.post em { color: var(--muted); font-style: normal; font-size: .85rem; }
blockquote.pr, article.post blockquote {
  margin: 24px 0; padding: 12px 16px; border-radius: 10px;
  background: var(--accent-soft); border: 0; font-size: .86rem; color: var(--muted);
}
article.post blockquote p { margin: 0; }

.toc { margin: 24px 0 8px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 12px;
  background: var(--bg); font-size: .9rem; }
.toc summary { cursor: pointer; font-weight: 700; }
.toc ol { margin: 10px 0 0; padding-left: 1.4em; }
.toc li { margin: 4px 0; line-height: 1.6; }
.toc a { color: var(--fg); text-decoration: none; }
.toc a:hover { color: var(--accent); }

/* 商品リスト: 押しやすいボタンを並べる */
ul.products { list-style: none; padding: 0 !important; display: grid; gap: 12px; }
ul.products li { margin: 0; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px;
  background: var(--bg); display: flex; flex-direction: column; gap: 10px; }
ul.products .pname { font-weight: 700; line-height: 1.6; font-size: .95rem; }
ul.products .no { color: var(--accent); margin-right: 6px; }
ul.products .btns { display: flex; flex-wrap: wrap; gap: 8px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-width: 150px;
  padding: 9px 18px; border-radius: 999px; font-weight: 700; font-size: .88rem;
  text-decoration: none; line-height: 1.4; transition: filter .15s ease; }
.btn:hover { filter: brightness(1.08); }
.btn.rakuten { background: var(--rakuten); color: #fff; }
.btn.amazon { background: var(--amazon); color: var(--amazon-fg); }
@media (max-width: 480px) { .btn { flex: 1 1 100%; } }

h2.summary + p, h2.summary + p + p { background: var(--accent-soft); padding: 14px 16px;
  border-radius: 10px; }

.related { margin-top: 40px; }
.related h2 { font-size: 1.1rem; margin: 0 0 14px; }

/* ---------- static pages ---------- */
.page { background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  padding: 8px clamp(18px, 4vw, 40px) 28px; margin-top: 24px; }
.page h2 { font-size: 1.1rem; margin: 28px 0 8px; }

@media (max-width: 640px) {
  .site-nav { display: none; }
  .hero { padding: 32px 0 16px; }
  .grid { grid-template-columns: 1fr; }
}