:root {
  --bg: #fbfaf7; --card: #ffffff; --ink: #1d2129; --sub: #5f6672; --line: #e6e3dc;
  --accent: #5b4bdb; --accent-soft: #eeebff; --warn: #fff6e0; --warn-line: #f0d48a;
  --amazon: #f3a847; --rakuten: #bf0000; --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #15171c; --card: #1e2128; --ink: #e9e7e2; --sub: #a3a9b3; --line: #30343c;
          --accent: #9d93ff; --accent-soft: #29264a; --warn: #2e2818; --warn-line: #6b5a2a; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.85;
  font-family: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif;
  font-size: 16.5px; }
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 18px; }

.site-head { background: var(--card); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; padding-top: 12px; padding-bottom: 12px; }
.logo { font-weight: 800; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: .02em; }
.logo::before { content: ""; display: inline-block; width: .8em; height: .8em; margin-right: .4em; border-radius: 3px;
  background: linear-gradient(135deg, var(--accent), #2bb3c0); vertical-align: -.05em; }
.site-head nav a { margin-left: 14px; color: var(--sub); text-decoration: none; font-size: .92rem; }
.site-head nav a:hover { color: var(--ink); }

main.wrap { padding-top: 22px; padding-bottom: 50px; }
.hero { padding: 26px 0 8px; }
.hero h1 { font-size: 1.6rem; line-height: 1.45; margin: 0 0 10px; }
.hero p { color: var(--sub); margin: 0; }
h2.sec { font-size: 1.1rem; margin: 34px 0 12px; padding-left: 10px; border-left: 4px solid var(--accent); }

.cards { display: grid; gap: 12px; }
@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
.card { display: flex; flex-direction: column; gap: 4px; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px 16px; color: var(--ink); text-decoration: none; transition: border-color .15s; }
.card:hover { border-color: var(--accent); }
.card-cat { font-size: .75rem; color: var(--accent); font-weight: 700; }
.card-title { font-weight: 700; line-height: 1.5; }
.card-desc { font-size: .86rem; color: var(--sub); line-height: 1.6; }

.post h1 { font-size: 1.55rem; line-height: 1.45; margin: 6px 0 6px; }
.post h2 { font-size: 1.28rem; margin: 40px 0 14px; padding: 8px 12px; background: var(--accent-soft); border-radius: 8px; line-height: 1.5; }
.post h3 { font-size: 1.08rem; margin: 28px 0 10px; padding-bottom: 4px; border-bottom: 2px solid var(--line); }
.post p { margin: 0 0 1.1em; }
.post ul, .post ol { padding-left: 1.4em; }
.post li { margin-bottom: .3em; }
.crumb { font-size: .82rem; color: var(--sub); margin: 0; }
.crumb a { color: var(--sub); }
.dates { font-size: .82rem; color: var(--sub); margin: 0 0 14px; }
.dates span + span { margin-left: 12px; }
.pr-notice { font-size: .95rem; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; }
.pr-notice span { display: inline-block; font-weight: 800; font-size: .72rem; color: #fff; background: var(--sub); border-radius: 4px; padding: 0 6px; margin-right: 8px; }
.lead { font-size: 1.02rem; margin: 18px 0 24px; padding: 14px 16px; border-left: 4px solid var(--accent); background: var(--card); border-radius: 0 8px 8px 0; }

.point, .caution { border-radius: var(--radius); padding: 14px 16px; margin: 20px 0; }
.point { background: var(--accent-soft); }
.caution { background: var(--warn); border: 1px solid var(--warn-line); }
.point > :last-child, .caution > :last-child { margin-bottom: 0; }
.point strong:first-child, .caution strong:first-child { display: block; margin-bottom: 4px; }
.summary { background: var(--card); border: 2px solid var(--accent); border-radius: var(--radius); padding: 14px 18px; margin: 22px 0; }
.summary h3 { border: 0; margin: 0 0 6px; padding: 0; }
.summary ul { margin: 0; }

.tbl { overflow-x: auto; margin: 18px 0 22px; -webkit-overflow-scrolling: touch; }
.tbl table { border-collapse: collapse; width: 100%; min-width: 520px; font-size: .9rem; background: var(--card); }
.tbl th, .tbl td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; line-height: 1.6; }
.tbl th { background: var(--accent-soft); white-space: nowrap; }
.tbl td.good { font-weight: 700; color: #2f855a; }
.tbl td.bad { color: #c05621; }
.tbl-note { font-size: .8rem; color: var(--sub); margin-top: -14px; }

.pbox { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 22px 0;
  box-shadow: 0 1px 0 rgba(0,0,0,.03); }
.pb-cat { font-size: .74rem; font-weight: 700; color: var(--accent); }
.pb-name { font-weight: 800; font-size: 1.08rem; line-height: 1.45; }
.pb-price { font-size: .9rem; margin-top: 4px; }
.pb-note { color: var(--sub); font-size: .78rem; }
.pb-points { margin: 10px 0 12px; padding-left: 1.2em; font-size: .9rem; }
.pb-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.btn { display: inline-block; flex: 1 1 140px; text-align: center; padding: 10px 12px; border-radius: 8px; font-weight: 700;
  font-size: .9rem; text-decoration: none; color: #fff; }
.btn-amazon { background: var(--amazon); color: #1d2129; }
.btn-rakuten { background: var(--rakuten); }
.btn-main { background: var(--accent); }
.btn-sub { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn:hover { filter: brightness(1.06); }

.toc { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 18px; margin: 18px 0 26px; font-size: .92rem; }
.toc strong { display: block; margin-bottom: 4px; }
.toc ol { margin: 0; }

.related { margin-top: 40px; }
.related h2 { font-size: 1.05rem; }
.related ul { padding-left: 1.2em; }

.site-foot { border-top: 1px solid var(--line); background: var(--card); font-size: .82rem; color: var(--sub); }
.site-foot .wrap { padding-top: 18px; padding-bottom: 26px; }
.site-foot a { color: var(--sub); }
.foot-pr { line-height: 1.7; }