:root{
 --bg:#f7f9fc;--surface:#fff;--ink:#101828;--muted:#667085;--line:#e4e8ef;
 --brand:#2457d6;--brand2:#153fa5;--soft:#eef4ff;--good:#0b6b50;--warn:#8a5a00;
 --max:1100px;--read:820px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;font-size:16px;line-height:1.82}
a{color:var(--brand);text-underline-offset:3px}
header{background:#fff;border-bottom:1px solid var(--line)}
.site-head{max-width:var(--max);margin:auto;padding:15px 22px;display:flex;gap:28px;align-items:center}
.brand{font-weight:850;color:var(--ink);text-decoration:none;white-space:nowrap}
nav{display:flex;gap:18px;font-size:.91rem;overflow:auto;white-space:nowrap}
nav a{color:#344054;text-decoration:none;font-weight:650}
main{max-width:var(--max);margin:0 auto;padding:34px 22px 72px}
.article{max-width:var(--read)}
.meta-row{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:14px}
.breadcrumbs{font-size:.79rem;color:#98a2b3}.breadcrumbs a{color:#667085}
.ad-note{font-size:10px;color:#b0b7c3;white-space:nowrap;font-weight:400}
h1{font-size:clamp(2rem,4.6vw,3rem);line-height:1.24;letter-spacing:-.03em;margin:0 0 24px}
h1>span,h1>small{display:block} h1>small{font-size:.58em;line-height:1.45;margin-top:6px;color:#344054;font-weight:700}
h2{font-size:1.52rem;line-height:1.4;margin:54px 0 18px;border-bottom:2px solid #dde6f4;padding-bottom:9px}
h3{font-size:1.13rem;line-height:1.5;margin:30px 0 10px}
p{margin:0 0 18px}.lead{font-size:1.07rem;color:#344054}
.hero{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px 32px;margin:6px 0 28px}
.hero-kicker{font-size:.78rem;color:var(--brand);font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.hero h1{margin:6px 0 14px}.hero p{max-width:760px}
.data-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:24px 0 28px}
.data-strip>div{background:#fff;padding:18px}
.data-strip span,.data-strip small{display:block;color:var(--muted);font-size:.79rem}.data-strip strong{display:block;font-size:1.28rem;line-height:1.35;margin:4px 0}
.summary{background:#fff;border:1px solid #dbe4f4;border-left:4px solid var(--brand);border-radius:12px;padding:19px 21px;margin:22px 0}
.summary strong{display:block;margin-bottom:6px}
.method{background:#f2f5f9;border-radius:10px;padding:14px 16px;color:#475467;font-size:.9rem;margin:20px 0}
.note{background:#fff8e7;border:1px solid #f2d58a;border-radius:10px;padding:15px 17px;color:#6d4b00;margin:20px 0}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:22px 0}
table{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;min-width:620px}
th,td{padding:13px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top} th{background:#f2f5f9;font-size:.9rem}tr:last-child td{border-bottom:none}
td.num{text-align:right;font-variant-numeric:tabular-nums}
.good{color:var(--good);font-weight:800}
.badge{display:inline-block;font-size:.72rem;padding:2px 7px;border-radius:999px;background:var(--soft);color:var(--brand2);font-weight:800}
.affiliate-inline{position:relative;margin:18px 0}.affiliate-inline a{text-decoration:underline;font-weight:800}.affiliate-inline img{position:absolute;width:1px;height:1px;overflow:hidden}
.sources{list-style:none;padding:0;margin:14px 0}.sources li{display:flex;justify-content:space-between;gap:18px;padding:10px 0;border-bottom:1px solid var(--line);font-size:.9rem}.sources span{color:#98a2b3;white-space:nowrap}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0}.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}.panel h3{margin-top:0}
.calc{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;margin:24px 0}.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.calc label{font-size:.85rem;color:#475467}.calc input,.calc select{width:100%;margin-top:6px;padding:11px 12px;border:1px solid #cfd6e2;border-radius:8px;font:inherit;background:#fff}.calc-output{margin-top:18px;padding:16px;background:#f3f6fb;border-radius:10px}.calc-output strong{font-size:1.35rem}
.site-home{max-width:var(--max)}.home-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}.home-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;text-decoration:none;color:var(--ink)}.home-card:hover{border-color:#b7c7e8}.home-card small{display:block;color:var(--muted);margin-top:6px}
footer{background:#fff;border-top:1px solid var(--line)}.foot-inner{max-width:var(--max);margin:auto;padding:28px 22px;color:#667085;font-size:.85rem}.foot-inner p{margin:0 0 8px}
@media(max-width:760px){
 .site-head{padding:12px 15px;display:block}.brand{display:block;margin-bottom:7px}nav{gap:14px}
 main{padding:25px 15px 52px}.meta-row{gap:8px}.ad-note{font-size:9px}
 h1{font-size:2rem}.data-strip{grid-template-columns:1fr}.grid2,.home-grid,.calc-grid{grid-template-columns:1fr}
 .hero{padding:22px 18px}.sources li{display:block}.sources span{display:block;margin-top:2px}
}


/* Collapsible sources and latest-price links */
.source-details{
  margin:44px 0 8px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.source-details summary{
  cursor:pointer;
  list-style:none;
  padding:14px 2px;
  color:#667085;
  font-size:.88rem;
  font-weight:700;
}
.source-details summary::-webkit-details-marker{display:none}
.source-details summary::after{
  content:"＋";
  float:right;
  color:#98a2b3;
  font-weight:400;
}
.source-details[open] summary::after{content:"−"}
.source-details__body{
  padding:2px 2px 16px;
  color:#667085;
  font-size:.86rem;
}
.source-details__body p{margin:0 0 10px}
.source-details__body ul{
  margin:6px 0 14px;
  padding-left:1.15rem;
}
.source-details__body li+li{margin-top:3px}
.source-caption{
  font-weight:700;
  color:#475467;
}
.source-affiliate{
  position:relative;
  margin:9px 0 0 !important;
}
.source-affiliate a{text-decoration:underline;
  font-weight:600;
  font-size:.88rem;
}
.source-affiliate img{
  position:absolute;
  width:1px;
  height:1px;
  overflow:hidden;
}