/* ============================================================
   HD Case Study v2 — サイト新デザイン準拠 (2026-09-25)
   本文HTML(cs-*)は不変。旧 topics-case.css は残置(ロールバック用)。
   ============================================================ */
.cs-main{display:block;margin-top:100px;background:#fff;color:var(--ink,#0b1320);line-height:2;font-size:16px;letter-spacing:.03em}
.cs-main img{max-width:100%;height:auto;border:0;display:block}
.cs-main p{margin:0}
.cs-main ul{margin:0;padding:0;list-style:none}
.cs-main a{text-decoration:none;color:inherit}
.cs-main .cs-en{font-family:var(--fs-en);letter-spacing:.16em}
/* ---- hero ---- */
.cs-hero{position:relative;padding:76px 24px 210px;overflow:hidden;background:linear-gradient(180deg,#f5f7fd 0%,#fff 100%)}
.cs-main .cs-hero-photo,.cs-main .cs-hero-photo.lazyloaded,.cs-main .cs-hero-photo.lazyloading{position:absolute;inset:-10%;background-size:cover;background-position:center;filter:blur(48px) saturate(1.25);opacity:.18 !important;pointer-events:none;transition:none}
.cs-hero::before,.cs-hero::after{content:"";position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none;opacity:.35}
.cs-hero::before{width:46vw;height:46vw;left:-16vw;top:-14vw;background:radial-gradient(closest-side,#2563eb,transparent 70%)}
.cs-hero::after{width:36vw;height:36vw;right:-12vw;bottom:-14vw;background:radial-gradient(closest-side,#ec4899,transparent 70%);opacity:.22}
.cs-hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(15,23,42,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(15,23,42,.05) 1px,transparent 1px);background-size:48px 48px;-webkit-mask-image:radial-gradient(60% 70% at 50% 30%,#000 0%,transparent 100%);mask-image:radial-gradient(60% 70% at 50% 30%,#000 0%,transparent 100%);pointer-events:none}
.cs-hero-in{position:relative;max-width:960px;margin:0 auto;text-align:center;z-index:2}
.cs-kicker{display:inline-flex;align-items:center;gap:10px;font-size:12px;font-weight:700;color:var(--c1,#2563eb);margin-bottom:18px}
.cs-kicker::before{content:"";width:28px;height:2px;border-radius:1px;background:var(--grad-brand,linear-gradient(90deg,#2563eb,#06b6d4))}
.cs-chips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:22px}
.cs-chip{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;background:#fff;border:1px solid var(--line,#e5e9f2);font-size:12.5px;font-weight:700;letter-spacing:.03em;color:#223}
.cs-chip::before{content:"";width:6px;height:6px;border-radius:1.5px;transform:rotate(45deg);background:var(--c1,#2563eb)}
.cs-chip-cat{background:var(--btn,#0b1320);border-color:var(--btn,#0b1320);color:#fff}
.cs-chip-cat::before{background:#fff}
.cs-client{font-size:14px;font-weight:700;color:#555;letter-spacing:.04em;margin-bottom:14px}
.cs-title{font-size:clamp(30px,4.2vw,54px);font-weight:700;line-height:1.3;letter-spacing:.02em;margin:0;color:var(--ink,#0b1320)}
.cs-title .cs-num{background:var(--grad-brand,linear-gradient(90deg,#2563eb,#06b6d4));-webkit-background-clip:text;background-clip:text;color:transparent;font-family:var(--fs-en);font-weight:700;letter-spacing:0;padding:0 .04em}
.cs-sub{margin-top:18px;font-size:16px;font-weight:500;color:#333;line-height:1.9}
.cs-date{margin-top:16px;font-size:12px;font-weight:700;color:#777}
/* ---- main visual ---- */
.cs-mv{position:relative;z-index:3;max-width:1040px;margin:-160px auto 0;padding:0 24px}
.cs-mv .cs-photo{margin:0}
.cs-mv .cs-photo{text-align:center}
.cs-mv .cs-photo img{width:100%;margin:0 auto;border-radius:24px;box-shadow:0 2px 4px rgba(15,23,42,.04),0 40px 80px -40px rgba(15,23,42,.45);border:1px solid rgba(255,255,255,.9)}
.cs-cap{display:block;margin-top:10px;font-size:12px;color:#777;letter-spacing:.03em;text-align:right}
/* ---- KPI ---- */
.cs-kpis{max-width:1040px;margin:36px auto 0;padding:0 24px}
.cs-kpi-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.cs-kpi{position:relative;padding:26px 22px 22px;border-radius:20px;background:rgba(255,255,255,.86);border:1px solid rgba(255,255,255,.95);box-shadow:0 2px 4px rgba(15,23,42,.04),0 24px 50px -34px rgba(15,23,42,.35);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);overflow:hidden}
.cs-kpi::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--grad-brand,linear-gradient(90deg,#2563eb,#06b6d4))}
.cs-kpi-v{font-family:var(--fs-en);font-weight:700;font-size:34px;line-height:1.1;letter-spacing:0;background:var(--grad-brand,linear-gradient(90deg,#2563eb,#06b6d4));-webkit-background-clip:text;background-clip:text;color:transparent}
.cs-kpi-v small{font-family:inherit;font-size:13px;font-weight:700;letter-spacing:.02em;margin-left:2px}
.cs-kpi-l{margin-top:10px;font-size:12.5px;line-height:1.6;color:#555;font-weight:500}
/* ---- article ---- */
.cs-article{max-width:860px;margin:80px auto 0;padding:0 24px}
.cs-lead{font-size:17px;line-height:2.1;color:#222}
.cs-spec{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:32px 0 0}
.cs-spec-i{margin:0;padding:16px 18px;border-radius:14px;background:var(--pale-2,#f5f7fd);border:1px solid var(--line,#e5e9f2)}
.cs-spec-t{font-size:11px;font-weight:700;color:var(--c1,#2563eb);margin:0}
.cs-spec-d{margin:6px 0 0;font-size:14px;font-weight:700;line-height:1.6;color:var(--ink,#0b1320)}
.cs-sec{margin-top:64px}
.cs-label{display:flex;align-items:center;gap:10px;font-size:11.5px;font-weight:700;color:var(--c1,#2563eb);margin-bottom:12px}
.cs-label::before{content:"";width:24px;height:2px;border-radius:1px;background:var(--grad-brand,linear-gradient(90deg,#2563eb,#06b6d4))}
.cs-sec h2{position:relative;margin:0 0 22px;padding:0 0 14px;font-size:26px;font-weight:700;line-height:1.5;letter-spacing:.03em;border-bottom:1px solid var(--line,#e5e9f2);color:var(--ink,#0b1320)}
.cs-sec h2::after{content:"";position:absolute;left:0;bottom:-1px;width:64px;height:3px;border-radius:2px;background:var(--grad-brand,linear-gradient(90deg,#2563eb,#06b6d4))}
.cs-sec h3{margin:32px 0 12px;padding-left:14px;border-left:3px solid var(--c1,#2563eb);font-size:18px;font-weight:700;line-height:1.5}
.cs-sec p{margin:0 0 1.4em;font-size:16px;line-height:2;color:#222}
.cs-sec p:last-child{margin-bottom:0}
/* ---- client box ---- */
.cs-clientbox{position:relative;margin:36px 0 0;padding:26px 28px 24px 30px;border-radius:18px;background:#fff;border:1px solid var(--line,#e5e9f2);box-shadow:0 20px 40px -34px rgba(15,23,42,.4);overflow:hidden}
.cs-clientbox::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--grad-brand,linear-gradient(180deg,#2563eb,#06b6d4))}
.cs-clientbox-label{font-size:11px;font-weight:700;color:var(--c1,#2563eb);margin-bottom:6px}
.cs-clientbox-name{font-size:19px;font-weight:700;line-height:1.4}
.cs-clientbox-chips{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 14px}
.cs-clientbox-chips span{padding:4px 11px;border-radius:999px;background:var(--pale-2,#f5f7fd);border:1px solid var(--line,#e5e9f2);font-size:11.5px;font-weight:700;color:#334}
.cs-clientbox p{font-size:14px;line-height:1.9;color:#333;margin:0}
.cs-clientbox .cs-srcnote{display:block;margin-top:8px;font-size:11.5px;color:#888}
/* ---- photo ---- */
.cs-photo{margin:28px 0 0}
.cs-photo img{width:auto;max-width:100%;border-radius:16px}
.cs-article>.cs-sec>.cs-photo img,.cs-mv .cs-photo img{width:100%}
.cs-photo.cs-fit-contain img{object-fit:contain;background:var(--pale-2,#f5f7fd);padding:16px}
/* ---- IG embed / posts ---- */
.cs-embed{margin:24px 0 0}
.cs-embed .cs-embed-wrap{max-width:540px;margin:0 auto}
.cs-embed .cs-cap{text-align:center}
.cs-sec h3.cs-embed-ttl{margin-top:36px}
.cs-posts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:20px 0 0}
.cs-posts.cs-posts-2{grid-template-columns:repeat(2,minmax(0,1fr));max-width:560px}
.cs-post{margin:0}
.cs-post-img{position:relative;aspect-ratio:9/16;border-radius:16px;overflow:hidden;background:#eef2f7;box-shadow:0 20px 40px -30px rgba(15,23,42,.5)}
.cs-post-img img{width:100%;height:100%;object-fit:cover}
.cs-post-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,10,40,0) 55%,rgba(0,10,40,.55) 100%);pointer-events:none}
.cs-play{position:absolute;left:50%;top:50%;width:52px;height:52px;margin:-26px 0 0 -26px;border-radius:50%;background:rgba(255,255,255,.9);box-shadow:0 8px 20px -8px rgba(0,0,0,.5);z-index:1}
.cs-play::before{content:"";position:absolute;left:55%;top:50%;transform:translate(-50%,-50%);border-left:16px solid var(--ink,#0b1320);border-top:10px solid transparent;border-bottom:10px solid transparent}
.cs-post-rank{position:absolute;left:12px;top:12px;z-index:1;padding:4px 10px;border-radius:999px;background:var(--btn,#0b1320);color:#fff;font-size:11px;font-weight:700}
.cs-post figcaption{margin-top:10px;text-align:center}
.cs-post-v{font-family:var(--fs-en);font-weight:700;font-size:22px;line-height:1.1;background:var(--grad-brand,linear-gradient(90deg,#2563eb,#06b6d4));-webkit-background-clip:text;background-clip:text;color:transparent}
.cs-post-v small{font-size:12px;font-weight:700;margin-left:2px}
.cs-post-f{display:block;margin-top:4px;font-size:11.5px;color:#666}
/* ---- results ---- */
.cs-main .cs-results{margin:28px 0 0;padding:0;display:grid;gap:10px}
.cs-results li{display:flex;align-items:flex-start;gap:12px;padding:14px 18px;border-radius:14px;background:var(--pale-2,#f5f7fd);border:1px solid var(--line,#e5e9f2);font-size:15px;line-height:1.8}
.cs-results li::before{content:"✓";flex:none;display:grid;place-items:center;width:24px;height:24px;margin-top:4px;border-radius:50%;background:var(--grad-brand,linear-gradient(135deg,#2563eb,#06b6d4));color:#fff;font-size:13px;font-weight:700}
.cs-results b{color:var(--c1,#2563eb);font-weight:700}
/* ---- table ---- */
.cs-tablewrap{overflow-x:auto;margin:20px 0 0;-webkit-overflow-scrolling:touch}
.cs-tablewrap+.cs-results,.cs-tablewrap+.cs-notes{margin-top:28px}
.cs-table{width:100%;border-collapse:collapse;font-size:14px;min-width:520px}
.cs-table th,.cs-table td{padding:12px 14px;border:1px solid var(--line,#e5e9f2);text-align:left;vertical-align:top;line-height:1.6}
.cs-table th{background:var(--pale-2,#f5f7fd);font-weight:700;color:var(--ink,#0b1320);white-space:nowrap}
.cs-table td b{color:var(--c1,#2563eb)}
/* ---- points ---- */
.cs-points{display:grid;gap:14px;margin:20px 0 0}
.cs-point{display:flex;gap:18px;padding:24px 26px 22px;border-radius:18px;background:#fff;border:1px solid var(--line,#e5e9f2);box-shadow:0 20px 40px -34px rgba(15,23,42,.35)}
.cs-point-no{flex:none;font-family:var(--fs-en);font-weight:700;font-size:30px;line-height:1;letter-spacing:0;color:transparent;-webkit-text-stroke:1.5px var(--c1,#2563eb)}
.cs-point h3{margin:0 0 8px;padding:0;border:0;font-size:17px;line-height:1.5}
.cs-point p{margin:0;font-size:14px;line-height:1.9;color:#333}
.cs-notes{margin-top:40px;padding-top:16px;border-top:1px solid var(--line,#e5e9f2)}
.cs-notes p{font-size:12.5px;line-height:1.8;color:#777;margin:0 0 4px}
/* ---- about band ---- */
.cs-aboutband{margin-top:90px;padding:80px 24px;background:linear-gradient(180deg,#f5f7fd,#fff)}
.cs-about{max-width:860px;margin:0 auto}
.cs-about .cs-label{margin-bottom:10px}
.cs-about h2{margin:0 0 16px;font-size:24px;font-weight:700;line-height:1.5;letter-spacing:.03em}
.cs-about-txt{font-size:15px;line-height:2;color:#333;margin:0}
.cs-company{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;margin:28px 0 0;border:1px solid var(--line,#e5e9f2);border-radius:16px;overflow:hidden;background:#fff}
.cs-company-i{display:flex;margin:0;border-top:1px solid var(--line,#e5e9f2)}
.cs-company-i:nth-child(-n+2){border-top:none}
.cs-company-t{flex:none;width:100px;margin:0;padding:13px 16px;background:var(--pale-2,#f5f7fd);font-size:12px;font-weight:700;color:var(--c1,#2563eb)}
.cs-company-d{margin:0;padding:13px 16px;font-size:13.5px;line-height:1.8;color:#222}
.cs-company-d a{color:var(--c1,#2563eb);text-decoration:underline;text-underline-offset:3px}
/* ---- case-lite (旧記事の自動レイアウト) ---- */
.cs-kpi-grid--auto{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.cs-main .cs-sec img{width:auto;max-width:100%;height:auto;border-radius:16px;margin:18px 0}
.cs-main .cs-lead img{width:auto;max-width:100%;height:auto;border-radius:16px;margin:12px 0}
.cs-main .cs-sec p img{margin:6px 0}
.cs-main .cs-sec iframe{max-width:100%;border-radius:16px;margin:12px 0}
.cs-main .cs-sec a{color:var(--c1,#2563eb);text-decoration:underline;text-underline-offset:3px}
.cs-main .cs-sec ul{list-style:disc;padding-left:1.4em;margin:0 0 1.4em}
.cs-main .cs-sec ul li{margin:.3em 0;font-size:15px;line-height:1.9;color:#222}
.cs-main .cs-sec ol{padding-left:1.4em;margin:0 0 1.4em}
.cs-main .cs-sec h4,.cs-main .cs-sec h5{margin:24px 0 8px;font-size:16px;font-weight:700;line-height:1.5}
.cs-main .cs-sec h4 span,.cs-main .cs-sec h5 span{font-size:inherit !important}
.cs-main .cs-sec strong{font-weight:700}
.cs-hero-photo--inline{background-image:var(--mv)}
.cs-mv--none{margin-top:-120px}
/* 記事内CTAは共通CTA帯(hd-cta)に置き換え */
.cs-cta{display:none}
@media (max-width:1023px){
  .cs-main{margin-top:64px;font-size:15px}
  .cs-hero{padding:44px 20px 150px}
  .cs-title{font-size:clamp(24px,6.6vw,34px)}
  .cs-sub{font-size:14px}
  .cs-mv{margin-top:-110px;padding:0 16px}
  .cs-mv .cs-photo img{border-radius:16px}
  .cs-kpis{padding:0 16px;margin-top:20px}
  .cs-kpi-grid,.cs-kpi-grid--auto{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  .cs-kpi{padding:18px 16px 16px;border-radius:16px}
  .cs-kpi-v{font-size:26px}
  .cs-article{margin-top:48px;padding:0 20px}
  .cs-lead{font-size:15.5px;line-height:2}
  .cs-spec{grid-template-columns:minmax(0,1fr);gap:8px}
  .cs-sec{margin-top:44px}
  .cs-sec h2{font-size:21px}
  .cs-sec p{font-size:15px;line-height:1.95}
  .cs-clientbox{padding:20px 20px 18px 24px}
  .cs-posts{gap:8px}
  .cs-post-v{font-size:16px}
  .cs-point{padding:18px 18px 16px;gap:8px 12px;flex-wrap:wrap;align-items:center}
  .cs-point-no{font-size:24px}
  .cs-point h3{flex:1 1 0;min-width:0;margin:0;font-size:16px;line-height:1.5}
  .cs-point p{flex:0 0 100%;margin:2px 0 0}
  .cs-tablewrap::before{content:"← 横にスクロールできます →";display:block;margin:0 0 6px;font-size:11px;letter-spacing:.04em;color:#8a94a6}
  .cs-table th,.cs-table td{white-space:nowrap;padding:10px 12px}
  .cs-aboutband{margin-top:56px;padding:56px 20px}
  .cs-company{grid-template-columns:minmax(0,1fr)}
  .cs-company-i:nth-child(2){border-top:1px solid var(--line,#e5e9f2)}
  .cs-company-t{width:84px}
}