/* DETAIL・ABOUT：白銀の地。右上からの柔らかい光と、床の奥のにじみ。真っ白・暖色にはしない */
body{position:relative;overflow-x:hidden}
.light{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(42% 38% at 82% 4%,rgba(250,252,253,.95),rgba(250,252,253,0) 72%),
    radial-gradient(70% 46% at 60% 102%,rgba(178,189,198,.55),rgba(178,189,198,0) 70%),
    linear-gradient(180deg,#E3E8EB 0%,#D9DEE2 46%,#CDD4D9 100%)}
.light::before{content:"";position:absolute;inset:-20%;filter:blur(28px);opacity:.75;
  background:
    linear-gradient(118deg,transparent 40%,rgba(255,255,255,.55) 44%,transparent 49%),
    linear-gradient(118deg,transparent 50%,rgba(255,255,255,.35) 53%,transparent 57%),
    linear-gradient(118deg,transparent 58%,rgba(255,255,255,.25) 60.5%,transparent 64%)}
/* TOPのプリズムの輪郭を、ごく薄く右上に */
.light::after{content:"";position:absolute;right:-8vw;top:-10vh;width:min(62vw,980px);aspect-ratio:1600/1213;
  background:url(../media/silver-edge.webp) center/contain no-repeat;opacity:.55;transform:rotate(-8deg);
  -webkit-mask-image:radial-gradient(70% 70% at 60% 40%,#000 30%,transparent 80%);mask-image:radial-gradient(70% 70% at 60% 40%,#000 30%,transparent 80%)}
main,.site-footer{position:relative;z-index:1}
.eyebrow{color:var(--ink-2)}
.cta .ring{color:var(--ink)}
.site-footer{border-top-color:rgba(23,33,43,.14)}

/* ---------- DETAIL ---------- */
.d-hero{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(32px,5vw,80px);align-items:center;min-height:100svh;padding:120px var(--gut) 64px;max-width:1600px;margin:0 auto}
.d-text h1{margin-top:20px;font-family:var(--latin);font-weight:300;font-size:clamp(34px,3.8vw,60px);line-height:1.15;letter-spacing:.04em}
.d-text h1 small{display:block;margin-top:12px;font-family:var(--serif);font-size:clamp(13px,1.05vw,16px);letter-spacing:.16em;color:var(--ink-2)}
.d-catch{margin-top:28px;font-family:var(--serif);font-size:clamp(17px,1.5vw,22px);letter-spacing:.06em;line-height:1.7}
.d-meta{margin-top:30px;display:grid;gap:8px;font-size:13px}
.d-meta div{display:grid;grid-template-columns:92px 1fr;gap:16px;padding-bottom:8px;border-bottom:1px solid rgba(23,33,43,.1)}
.d-meta dt{font-family:var(--latin);font-size:10.5px;letter-spacing:.24em;color:var(--ink-3);padding-top:3px}
.d-text .cta{margin-top:34px}

.d-visual{display:grid;justify-items:center;gap:20px}
.stage{width:100%;perspective:1400px;display:grid;place-items:center;min-height:min(56vw,640px);touch-action:pan-y}
.device{position:relative;transform-style:preserve-3d;will-change:transform;border-radius:6px;overflow:hidden;background:#0d1117;
  box-shadow:0 0 0 1px rgba(255,255,255,.7),0 2px 0 rgba(255,255,255,.5) inset,0 40px 90px rgba(40,52,64,.32),0 12px 30px rgba(40,52,64,.18);
  width:min(100%,880px);aspect-ratio:16/10;transition:width .8s var(--ease),aspect-ratio .8s var(--ease),border-radius .8s var(--ease)}
.device::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(120deg,rgba(255,255,255,.22),rgba(255,255,255,0) 30%,rgba(255,255,255,0) 72%,rgba(255,255,255,.1))}
.device img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:top;transition:opacity .5s .2s}
.device .sp{opacity:0}
.device[data-mode="sp"]{width:min(46%,300px);aspect-ratio:520/1125;border-radius:22px}
.device[data-mode="sp"] .sp{opacity:1}
.device[data-mode="sp"] .pc{opacity:0;transition-delay:0s}
.device.is-reel{width:min(62%,330px);aspect-ratio:9/16;border-radius:18px}
.device video{width:100%;height:100%;object-fit:cover}
.play{position:absolute;left:50%;bottom:18px;translate:-50% 0;padding:8px 18px;border-radius:99px;background:rgba(13,17,23,.6);color:#fff;font-size:12px;letter-spacing:.12em;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.switch{display:flex;gap:4px;padding:4px;border-radius:99px;border:1px solid rgba(23,33,43,.16);background:rgba(255,255,255,.3)}
.switch button{min-width:64px;min-height:36px;padding:0 16px;border-radius:99px;font-family:var(--latin);font-size:11px;letter-spacing:.22em;color:var(--ink-2);transition:background .3s,color .3s}
.switch button[aria-pressed="true"]{background:var(--ink);color:var(--silver-100)}
.credit{font-size:12px;color:var(--ink-2)}

.d-body{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:clamp(28px,4vw,64px);padding:40px var(--gut) 72px;max-width:1600px;margin:0 auto}
.d-col{padding-top:22px;border-top:1px solid rgba(23,33,43,.16)}
.d-col h2,.d-tabs h2,.d-cuts h2{margin:10px 0 14px;font-family:var(--serif);font-weight:400;font-size:clamp(18px,1.5vw,22px);letter-spacing:.06em}
.d-col p{font-size:14.5px;color:var(--ink-2);max-width:34em}

.d-tabs{padding:24px var(--gut) 96px;max-width:1600px;margin:0 auto}
.tablist{margin-top:18px;display:flex;gap:6px;flex-wrap:wrap;border-bottom:1px solid rgba(23,33,43,.16)}
.tablist button{position:relative;padding:14px 18px 16px;font-family:var(--latin);font-size:12px;letter-spacing:.24em;color:var(--ink-2);transition:color .3s}
.tablist button small{margin-left:10px;font-family:var(--sans);font-size:11px;letter-spacing:.08em}
.tablist button[aria-selected="true"]{color:var(--ink)}
.tablist button::after{content:"";position:absolute;left:18px;right:18px;bottom:-1px;height:1px;background:var(--ink);transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.tablist button[aria-selected="true"]::after{transform:none}
.tabpanel{padding-top:30px;max-width:40em}
.tabpanel p{font-family:var(--serif);font-size:clamp(16px,1.35vw,20px);line-height:2.05;letter-spacing:.05em;animation:t-in .6s var(--ease)}
@keyframes t-in{from{opacity:0;transform:translateY(8px)}}

.d-cuts{padding:0 var(--gut) 96px;max-width:1600px;margin:0 auto}
.cuts{margin-top:18px;display:grid;grid-template-columns:repeat(3,minmax(0,220px));gap:18px}
.cuts img{border-radius:8px;box-shadow:0 20px 50px rgba(40,52,64,.2)}

.d-next{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center;padding:56px var(--gut) 96px;max-width:1600px;margin:0 auto;border-top:1px solid rgba(23,33,43,.14)}
.d-next .back{display:inline-flex;align-items:center;gap:18px;font-family:var(--latin);font-size:11.5px;letter-spacing:.24em}
.d-next .back .ring{width:48px;height:48px;border:1px solid rgba(23,33,43,.3);border-radius:50%;display:grid;place-items:center}
.d-next .back svg{transform:scaleX(-1)}
.d-next .next{justify-self:end;display:grid;grid-template-columns:auto 200px;grid-template-rows:auto auto;column-gap:22px;align-items:end;text-align:right}
.d-next .next .lbl{font-family:var(--latin);font-size:10.5px;letter-spacing:.26em;color:var(--ink-3)}
.d-next .next .t{grid-row:2;font-family:var(--latin);font-size:clamp(18px,1.8vw,26px);letter-spacing:.04em}
.d-next .next img{grid-column:2;grid-row:1/3;width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;object-position:top;border-radius:3px;box-shadow:0 18px 40px rgba(40,52,64,.22);transition:transform .5s var(--ease)}
.d-next .next:hover img{transform:translateY(-4px)}

/* 入ってきたときは、作品の絵から静かに */
html.js .detail .d-hero>*{animation:d-in 1s var(--ease) both}
html.js .detail .d-visual{animation-delay:.12s}
@keyframes d-in{from{opacity:0;transform:translateY(14px)}}

/* ---------- ABOUT ---------- */
.a-hero{padding:clamp(150px,24vh,240px) var(--gut) 72px;max-width:1600px;margin:0 auto}
.a-hero h1{margin-top:22px;font-family:var(--serif);font-weight:300;font-size:clamp(32px,4vw,60px);line-height:1.5;letter-spacing:.05em}
.a-hero h1 span{display:block}
.a-hero .lead{margin-top:30px;max-width:30em;font-size:clamp(14px,1.1vw,16px);color:var(--ink-2)}
.a-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;padding:24px var(--gut) 96px;max-width:1600px;margin:0 auto}
.a-step{padding:4px clamp(18px,2.6vw,40px) 0;border-left:1px solid rgba(23,33,43,.16)}
.a-step:first-child{padding-left:0;border-left:0}
.a-step h2{margin:10px 0 14px;font-family:var(--latin);font-weight:400;font-size:clamp(20px,1.9vw,28px);letter-spacing:.16em}
.a-step h2 small{margin-left:12px;font-family:var(--sans);font-size:12px;letter-spacing:.1em;color:var(--ink-2)}
.a-step p{font-size:14px;color:var(--ink-2)}
.a-studio{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(32px,5vw,80px);padding:80px var(--gut);max-width:1600px;margin:0 auto;border-top:1px solid rgba(23,33,43,.14)}
.a-studio h2{margin-top:16px;font-family:var(--serif);font-weight:300;font-size:clamp(26px,2.8vw,42px);line-height:1.55;letter-spacing:.05em}
.a-studio h2 span{display:block}
.a-studio-body p{font-size:15px;color:var(--ink-2);max-width:34em}
.a-studio-body p+p{margin-top:14px}
.a-studio-body h3{margin-top:36px;font-size:13px;font-weight:500;letter-spacing:.14em}
.a-list{margin-top:12px;display:grid;grid-template-columns:1fr 1fr;gap:0 24px}
.a-list li{padding:12px 0;border-bottom:1px solid rgba(23,33,43,.12);font-size:14px}
.a-flow{padding:80px var(--gut);max-width:1600px;margin:0 auto;border-top:1px solid rgba(23,33,43,.14)}
.a-flow h2{margin-top:14px;font-family:var(--serif);font-weight:400;font-size:clamp(22px,2vw,30px);letter-spacing:.06em}
.a-flow ol{margin-top:34px;display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.a-flow li{padding-top:16px;border-top:1px solid rgba(23,33,43,.22)}
.a-flow .n{font-family:var(--latin);font-size:11px;letter-spacing:.24em;color:var(--ink-3)}
.a-flow li p{margin-top:8px;font-size:13.5px;color:var(--ink-2)}
.a-flow .note{margin-top:28px;font-size:13px;color:var(--ink-2)}
.a-next{display:flex;flex-wrap:wrap;gap:24px 56px;padding:24px var(--gut) 110px;max-width:1600px;margin:0 auto}

.reveal{opacity:0;transform:translateY(16px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* 設計を見る：最初は完成画面の板1枚。触れると重なり順どおりの層に分かれ、左の一覧で層を選ぶ（スクロール連動なし） */
.d-build{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);grid-template-rows:auto auto;column-gap:clamp(32px,5vw,80px);max-width:1600px;margin:0 auto;padding:24px var(--gut) 110px}
.d-build h2{margin:10px 0 0;font-family:var(--serif);font-weight:400;font-size:clamp(18px,1.5vw,22px);letter-spacing:.06em}
.d-build .lead{margin-top:14px;font-size:14px;color:var(--ink-2);max-width:30em}
.b-head{grid-column:1;grid-row:1;align-self:end}
.b-list{grid-column:1;grid-row:2;align-self:start}
.layers{margin-top:30px;border-top:1px solid rgba(23,33,43,.16)}
.layers li{list-style:none;border-bottom:1px solid rgba(23,33,43,.16)}
.layers button{display:grid;grid-template-columns:34px 1fr auto;align-items:baseline;width:100%;min-height:52px;padding:16px 0;text-align:left;color:var(--ink-2);transition:color .3s}
.layers .no{font-family:var(--latin);font-size:11px;letter-spacing:.2em}
.layers .nm{font-size:15px;letter-spacing:.08em}
.layers .en{font-family:var(--latin);font-size:10.5px;letter-spacing:.24em}
.layers button[aria-selected="true"]{color:var(--ink)}
.why{display:grid;grid-template-rows:0fr;transition:grid-template-rows .6s var(--ease)}
.why>div{overflow:hidden}
.layers li.is-on .why,html:not(.js) .why{grid-template-rows:1fr}
.why p{padding:0 0 18px 34px;font-size:13.5px;line-height:2;color:var(--ink)}
.why p+p{margin-top:-8px;color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:10px 18px;padding:0 0 18px 34px;font-size:12px;color:var(--ink-2)}
.chips span{display:flex;align-items:center;gap:8px}
.chips i{width:14px;height:14px;border-radius:50%;border:1px solid rgba(23,33,43,.25)}
.chips b{font-family:var(--latin);font-weight:400;letter-spacing:.08em}
.why .fonts{font-size:12px;line-height:1.9;color:var(--ink-2)}
.b-stage{grid-column:2;grid-row:1/3;align-self:center;position:relative;aspect-ratio:16/12;perspective:2200px;perspective-origin:50% 40%}
.b-stack{position:absolute;inset:0;display:grid;place-items:center;transform-style:preserve-3d;cursor:pointer}
.b-stack .sheet{position:absolute;width:86%;aspect-ratio:16/10;transform-style:preserve-3d;transform:rotateX(8deg) rotateY(-10deg);transition:transform 1.3s var(--ease),opacity .6s var(--ease)}
.b-stack .sheet img{width:100%;height:100%;object-fit:cover}
.b-stack .sheet:first-child{background:#E6E8E8;box-shadow:0 30px 60px -30px rgba(23,33,43,.45)}
.b-stack .edge{position:absolute;inset:0;border:1px solid rgba(255,255,255,0);transition:border-color .6s}
.b-stack svg{position:absolute;inset:0;width:100%;height:100%;opacity:0;transition:opacity .6s}
.b-stage.is-open .sheet{transform:rotateX(58deg) rotateZ(-28deg) translateZ(calc(var(--z) * 1px))}
.b-stage.is-open .edge{border-color:rgba(255,255,255,.75)}
.b-stage.is-open .sheet:not(:first-child){background:rgba(233,237,242,.16)}
.b-stage.is-open[data-on] .sheet{opacity:.32}
.b-stage.is-open .sheet.is-on{opacity:1}
.b-stage.is-open .sheet.is-on svg{opacity:1}
.hint{position:absolute;left:50%;bottom:2%;transform:translateX(-50%);display:flex;align-items:center;gap:12px;font-size:12px;letter-spacing:.12em;color:var(--ink-2);transition:opacity .5s;pointer-events:none;white-space:nowrap}
.hint::before{content:"";width:26px;height:26px;border:1px solid currentColor;border-radius:50%}
.b-stage.is-open .hint,html:not(.js) .hint{opacity:0}

@media (max-width:900px){
  .d-hero{grid-template-columns:1fr;min-height:0;padding-top:100px}
  .d-visual{order:-1}
  .stage{min-height:0;padding:12px 0}
  .d-next{grid-template-columns:1fr;gap:36px}
  .d-next .next{justify-self:stretch;grid-template-columns:1fr 140px}
  .a-steps{grid-template-columns:1fr;gap:28px}
  .a-step,.a-step:first-child{padding:20px 0 0;border-left:0;border-top:1px solid rgba(23,33,43,.16)}
  .a-studio{grid-template-columns:1fr}
  .a-flow ol{grid-template-columns:1fr}
  .a-list{grid-template-columns:1fr}
  .cuts{grid-template-columns:repeat(3,1fr);gap:10px}
  .light::after{width:120vw;right:-40vw;top:-6vh;opacity:.4}
  .d-build{grid-template-columns:1fr;padding-bottom:88px}
  .b-head,.b-list,.b-stage{grid-column:1;grid-row:auto}
  .b-stage{position:sticky;top:0;z-index:2;aspect-ratio:1/.92;margin:12px calc(var(--gut) * -1) 0;padding:0 var(--gut);background:linear-gradient(180deg,rgba(217,222,226,0),rgba(217,222,226,.9) 14%,rgba(217,222,226,.9) 84%,rgba(217,222,226,0))}
  .b-list{order:1}
  .layers{margin-top:8px}
  .b-stack .sheet{width:84%}
  .b-stage.is-open .sheet{transform:rotateX(58deg) rotateZ(-28deg) translateZ(calc(var(--z) * .5px))}
}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.b-stack .sheet,.why{transition:none}}