:root{--bg: #f9f2e8;--text: #16150f;--muted: #6b6a63;--line: #ece4d5;--radius: 20px;--page: 1920px;--panel: #fff;--pad-left: clamp(1.5rem, 6vw, 7.5rem);--pad-right: clamp(1rem, 2vw, 1.75rem);--col-gap: clamp(2.5rem, 5vw, 5rem);--shell-width: min(100vw, var(--page));--cols-width: calc( var(--shell-width) - var(--pad-left) - var(--pad-right) - var(--col-gap) );--left-col: calc(var(--cols-width) * 1.25 / 2.25);--split-x: calc( (100vw - var(--shell-width)) / 2 + var(--pad-left) + var(--left-col) + var(--col-gap) * .25 );--headline-size: clamp(2.75rem, 11.5cqw, 7rem);--title-size: clamp(1.25rem, 1.7vw, 1.9rem);--accent-pink: #ea1a7f;--accent-coral: #f0724a;--accent-orange: #f5a93e;--accent-gradient: linear-gradient( 100deg, var(--accent-pink), var(--accent-coral), var(--accent-orange), var(--accent-coral), var(--accent-pink) );--font-display: "Instrument Serif", "Iowan Old Style", Georgia, serif;--font-display-ja: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", 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clamp(4rem,9vw,7rem);text-align:left}.split-intro{position:sticky;top:7.5rem;container-type:inline-size}.portrait{display:block;position:relative;width:clamp(10rem,17vw,20rem);aspect-ratio:1;margin-bottom:clamp(1.5rem,2.5vw,2rem);border-radius:50%;overflow:hidden;background-color:var(--line)}.portrait:focus-visible{outline:2px solid var(--accent-pink);outline-offset:4px}.portrait img{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;object-fit:cover;display:block;opacity:0;transition:opacity .3s ease}.portrait img.is-shown{opacity:1}.headline{margin:0;font-family:var(--font-display);font-size:var(--headline-size);font-weight:var(--font-display-weight, 600);letter-spacing:-.02em;line-height:1;text-wrap:balance;font-optical-sizing:auto}.headline:lang(ja){font-family:var(--font-display-ja);font-weight:600;letter-spacing:0;line-height:1.25}.card-title:lang(ja),.case-title:lang(ja){letter-spacing:0}.headline-line{display:block}.amp{font-style:italic;padding-right:.02em}.headline-accent{background-image:var(--accent-gradient);background-size:300% 100%;background-position:0% 0%;-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent;animation:headline-pan 22s linear infinite}@keyframes headline-pan{to{background-position:-300% 0%}}.intro{max-width:52ch;margin:clamp(1.5rem,2.5vw,2rem) 0 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var(--accent-orange);font-family:var(--font-display);font-size:clamp(1.6rem,2.6vw,2.4rem);font-weight:var(--font-display-weight, 400);line-height:1.2;letter-spacing:-.015em}.case-figure{margin:clamp(1.75rem,3.5vw,2.75rem) auto 0;max-width:40rem}.case-figure.is-wide{max-width:100%}.case-figure img{width:100%;height:auto;display:block;border-radius:6px}.case-figure figcaption{margin-top:.85rem;font-size:.9375rem;line-height:1.5;color:var(--muted)}.case-next{display:flex;flex-direction:column;gap:.35rem;margin-top:clamp(4rem,8vw,7rem);padding-top:1.75rem;border-top:1px solid var(--line)}.case-next-label{font-size:.875rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.case-next-title{font-size:clamp(1.5rem,2.2vw,2rem);font-weight:500;letter-spacing:-.02em;color:var(--text);transition:color .2s ease}.case-next:hover .case-next-title{color:var(--muted)}@media(max-width:640px){.nav-links{display:none}.nav{padding:1rem 0}}@media(max-width:860px){body,body[data-page=case]{background:var(--bg)}.split{grid-template-columns:1fr}.split-intro{position:static}}@media(prefers-reduced-motion:reduce){*{transition:none!important}.headline-accent{animation:none}.card:hover .card-title{transform:none}}.cs{--cs-read: 48rem;--cs-media: 68rem;--cs-rail: 12.5rem;--cs-gap: clamp(2rem, 4vw, 4.5rem);--cs-dim: #5b5a53;--cs-hairline: #e6ddcc;--cs-panel: #fffdf9;max-width:88rem;margin:0 auto;padding-bottom:clamp(4rem,9vw,7rem);font-size:1.0625rem;line-height:1.7}.cs-read{max-width:var(--cs-read);margin-inline:0 auto}.cs-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}.cs-h1{margin:.5rem 0 0;font-family:var(--font-display);font-weight:var(--font-display-weight, 400);font-size:clamp(2.75rem,7vw,4.5rem);line-height:1;letter-spacing:-.025em}.cs-h2{margin:0 0 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.4rem;font-size:.9375rem;font-weight:600;line-height:1.4}.cs-metric-note{margin:0;font-size:.875rem;line-height:1.5;color:var(--cs-dim)}.cs-layout{display:grid;gap:var(--cs-gap)}.cs-flow{min-width:0;max-width:var(--cs-media)}.cs-section{margin-top:clamp(4rem,8vw,7rem);scroll-margin-top:6rem}.cs-section:first-child{margin-top:0}.cs-rail{display:none}@media(min-width:1080px){.cs-layout{grid-template-columns:var(--cs-rail) minmax(0,1fr)}.cs-rail{display:block;position:sticky;top:6.5rem;align-self:start;max-height:calc(100vh - 9rem);overflow-y:auto}}.cs-rail-title{margin:0 0 .9rem;font-size:.75rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--cs-dim)}.cs-rail-list{margin:0;padding:0;list-style:none}.cs-rail-link{display:block;width:100%;padding:.3rem 0 .3rem .75rem;border:0;border-left:2px solid var(--cs-hairline);background:none;font:inherit;font-size:.875rem;line-height:1.4;text-align:left;color:var(--cs-dim);cursor:pointer;transition:color .15s 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figcaption{margin-top:.85rem;font-size:.9375rem;line-height:1.55;color:var(--cs-dim)}.cs-figure--wide figcaption,.cs-figure--bleed figcaption{max-width:var(--cs-read)}.cs-cards{display:grid;gap:1px;margin-block:clamp(1.75rem,3.5vw,2.5rem);margin-inline:0 auto;padding:1px;max-width:var(--cs-media);list-style:none;background:var(--cs-hairline);border-radius:14px;overflow:hidden}.cs-card{display:flex;flex-direction:column;gap:.5rem;padding:clamp(1.25rem,2.5vw,1.6rem);background:var(--bg)}.cs-card.is-emphasis{background:var(--cs-panel)}.cs-card-title{margin:0;font-size:1.0625rem;font-weight:600;line-height:1.35;letter-spacing:-.01em}.cs-card-body{margin:0;font-size:.9375rem;line-height:1.6;color:var(--cs-dim)}.cs-card .cs-chip{margin:auto 0 0;align-self:flex-start}.cs-card.is-impact .cs-card-title{font-size:1.125rem}.cs-card-pairs{margin:0}.cs-card-pairs dt{font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#b31460}.cs-card-pairs dt~dt{margin-top:.9rem}.cs-card-pairs dd{margin:.3rem 0 0;font-size:.9375rem;line-height:1.6;color:var(--cs-dim)}.cs-callout{margin:clamp(2rem,4vw,2.75rem) 0;padding:clamp(1.25rem,2.5vw,1.75rem);border-radius:14px;border:1px solid var(--cs-hairline);background:var(--cs-panel)}.cs-callout--learning{border-color:color-mix(in srgb,var(--accent-pink) 25%,transparent);background:color-mix(in srgb,var(--accent-pink) 5%,var(--cs-panel))}.cs-callout-title{margin:0 0 .6rem;font-size:1.0625rem;font-weight:600;letter-spacing:-.01em}.cs-callout-body{margin:0;font-size:1rem;line-height:1.65}.cs-tablewrap{max-width:var(--cs-media);margin-block:clamp(1.75rem,3.5vw,2.5rem);margin-inline:0 auto;overflow-x:auto;border:1px solid var(--cs-hairline);border-radius:14px;background:var(--cs-panel)}.cs-table{width:100%;min-width:34rem;border-collapse:collapse;font-size:.9375rem;line-height:1.55;text-align:left}.cs-table th,.cs-table td{padding:.85rem 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