/* ============================================================
   UNDERDOGS — about.css（ABOUTページ / v2.1 下層リッチ化第1弾）
   TOP（home.css）のデザイン言語を下層に展開。
   style.css → about.css → chrome.css の順で読み込む。
   ============================================================ */

/* ---------- shared motion primitives（TOPと同じ挙動） ---------- */
.rv{opacity:0;transform:translateY(42px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rv.in{opacity:1;transform:none}
.rv[data-d="1"]{transition-delay:.08s}.rv[data-d="2"]{transition-delay:.16s}
.rv[data-d="3"]{transition-delay:.24s}.rv[data-d="4"]{transition-delay:.32s}
.rv[data-d="5"]{transition-delay:.4s}

.cur-img{position:relative;overflow:hidden}
.cur-img::after{content:"";position:absolute;inset:0;background:var(--accent);transform:scaleX(1);transform-origin:100% 50%;transition:transform .9s cubic-bezier(.16,1,.3,1) .1s;z-index:2}
.cur-img .bgi{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.25);transition:transform 1.4s cubic-bezier(.16,1,.3,1) .1s}
.cur-img.in::after{transform:scaleX(0)}
.cur-img.in .bgi{transform:scale(1)}

.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:clamp(34px,4.5vw,60px)}
.sec-head__eng{font-family:var(--f-display);font-size:clamp(44px,7.4vw,104px);line-height:.94;letter-spacing:.015em}
.sec-head__eng .accent{color:var(--accent)}
.sec-head__jp{display:flex;align-items:flex-start;gap:12px;margin-top:12px;font-size:clamp(13px,1.4vw,16px);font-weight:700;letter-spacing:.14em;line-height:1.9}
.sec-head__jp::before{content:"";flex:0 0 38px;width:38px;height:2px;background:var(--accent);margin-top:.8em}
.sec-head__side{font-family:var(--f-label);font-size:11px;letter-spacing:.26em;color:var(--muted);text-align:right;line-height:2;white-space:nowrap}
.split{overflow:hidden;display:inline-block;vertical-align:bottom;padding-bottom:.1em;margin-bottom:-.1em;white-space:nowrap}
.split .ch{display:inline-block;transform:translateY(110%) rotate(4deg);transition:transform .7s cubic-bezier(.16,1,.3,1)}
.in-view .split .ch{transform:translateY(0) rotate(0)}
@media(max-width:700px){
  .sec-head{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:clamp(26px,7vw,40px)}
  .sec-head__eng{font-size:clamp(40px,11.5vw,64px)}
  .sec-head__jp{letter-spacing:.08em}
  .sec-head__side{text-align:left;line-height:1.9}
}

/* アンカー着地位置 */
.ab-what[id],.ab-chain[id],.ab-system[id],.ab-mani[id]{scroll-margin-top:calc(var(--head-h) + 14px)}

/* ============================================================
   HERO
   ============================================================ */
.ab-hero{position:relative;min-height:min(88svh,860px);display:flex;align-items:flex-end;
  background:var(--ink);color:#fff;overflow:hidden;padding-bottom:clamp(48px,7vh,90px)}
.ab-hero__bg{position:absolute;inset:0;background-size:cover;background-position:center 30%;opacity:.5;will-change:transform}
.ab-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(200deg,rgba(0,0,0,.2) 0%,rgba(0,0,0,.06) 40%,rgba(0,0,0,.82) 100%)}
.ab-hero__in{position:relative;z-index:2;width:min(1280px,92vw);margin-inline:auto;padding-top:calc(var(--head-h) + 40px)}
.ab-hero__crumb{font-family:var(--f-label);font-size:11px;letter-spacing:.22em;opacity:.75;margin-bottom:clamp(18px,3vh,30px)}
.ab-hero__crumb a:hover{color:var(--accent)}
.ab-hero__eyebrow{font-family:var(--f-label);font-size:12px;letter-spacing:.34em;color:var(--accent);margin-bottom:14px}
.ab-hero__eng{font-family:var(--f-display);font-size:clamp(74px,15vw,220px);line-height:.9;letter-spacing:.01em}
.ab-hero__jp{margin-top:18px;font-size:clamp(14px,1.6vw,18px);font-weight:700;letter-spacing:.2em}
.ab-hero__lead{margin-top:clamp(16px,2.6vh,26px);font-size:clamp(13.5px,1.35vw,15.5px);line-height:2.2;color:rgba(255,255,255,.88)}
.ab-hero__vert{position:absolute;right:clamp(16px,3vw,44px);bottom:clamp(46px,8vh,100px);z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:.6em;
  font-family:var(--f-min);font-weight:600;font-size:clamp(12px,1.2vw,16px);line-height:1;opacity:.85;pointer-events:none}
.ab-hero__vert::before{content:"";display:block;width:1px;height:52px;background:rgba(255,255,255,.55);margin-bottom:14px}
.ab-hero__vert .pt{transform:translate(.3em,-.32em)}
@media(max-width:960px){.ab-hero__vert{display:none}}
.ab-hero__no{position:absolute;right:clamp(64px,7vw,120px);top:calc(var(--head-h) + 2vh);z-index:2;
  font-family:var(--f-display);font-size:clamp(80px,13vw,190px);line-height:1;color:transparent;
  -webkit-text-stroke:1px rgba(255,255,255,.25);pointer-events:none;user-select:none}
@media(max-width:960px){.ab-hero__no{display:none}}

/* ============================================================
   WHAT (#what)
   ============================================================ */
.ab-what{position:relative;padding:clamp(80px,10vw,150px) 0;overflow:clip}
.ab-what__ghost{position:absolute;top:clamp(6px,1.2vw,22px);right:clamp(6px,1.4vw,26px);font-family:var(--f-min);font-weight:800;
  font-size:clamp(140px,22vw,320px);line-height:1.06;color:rgba(12,12,12,.04);pointer-events:none;user-select:none}
.ab-what__grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(28px,4.5vw,70px);align-items:center}
@media(max-width:860px){.ab-what__grid{grid-template-columns:1fr}}
.ab-what__copy .mline{display:block;overflow:hidden;padding:.06em 0}
.ab-what__copy .mline span{display:inline-block;transform:translateY(115%);transition:transform 1s cubic-bezier(.16,1,.3,1)}
.ab-what__copy.in-view .mline span{transform:translateY(0)}
.ab-what__copy.in-view .mline:nth-child(2) span{transition-delay:.14s}
.ab-what__h{font-family:var(--f-min);font-weight:800;font-size:clamp(26px,3.6vw,46px);line-height:1.7;letter-spacing:.04em}
.ab-what__h .accent{color:var(--accent)}
.ab-what__body{margin-top:clamp(20px,2.6vw,30px);font-size:clamp(13.5px,1.35vw,15px);line-height:2.3;color:var(--ink-soft)}
.ab-what__en{margin-top:clamp(22px,3vw,34px);font-family:var(--f-display);font-size:clamp(14px,1.7vw,21px);letter-spacing:.12em;
  color:transparent;-webkit-text-stroke:1px rgba(12,12,12,.4);line-height:1.5}
.ab-what__img{position:relative}
.ab-what__img .cur-img{aspect-ratio:4/5}
.ab-what__img .num{position:absolute;top:-24px;left:-8px;z-index:3;font-family:var(--f-display);
  font-size:clamp(56px,6.6vw,96px);line-height:1;color:transparent;-webkit-text-stroke:1.4px var(--accent)}
.ab-what__cap{margin-top:12px;font-family:var(--f-label);font-size:10px;letter-spacing:.24em;color:var(--muted);text-align:right}

/* 3つのポイント */
.ab-points{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,1.8vw,24px);margin-top:clamp(54px,7vw,90px)}
@media(max-width:860px){.ab-points{grid-template-columns:1fr}}
.ab-point{position:relative;background:var(--paper);border:1px solid var(--line);padding:clamp(24px,2.8vw,38px) clamp(20px,2.2vw,30px);overflow:hidden;
  transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.ab-point:hover{transform:translateY(-8px);box-shadow:0 24px 50px rgba(0,0,0,.1)}
.ab-point::before{content:"";position:absolute;left:0;top:0;width:100%;height:4px;background:var(--accent);
  transform:scaleX(0);transform-origin:0 50%;transition:transform .5s var(--ease)}
.ab-point:hover::before{transform:scaleX(1)}
.ab-point__no,.ab-point h4,.ab-point p{position:relative;z-index:1}
.ab-point__no{font-family:var(--f-display);font-size:clamp(34px,3.6vw,48px);line-height:1;color:transparent;-webkit-text-stroke:1.2px var(--accent)}
.ab-point h4{margin-top:14px;font-size:clamp(16px,1.7vw,19px);font-weight:900;line-height:1.6;letter-spacing:.02em}
.ab-point p{margin-top:12px;font-size:13px;font-weight:500;line-height:2.05;color:var(--ink-soft)}
.ab-point__ghost{position:absolute;z-index:0;right:clamp(10px,1.2vw,16px);bottom:clamp(6px,.9vw,12px);
  font-family:var(--f-display);font-size:clamp(58px,6vw,84px);line-height:.8;color:rgba(12,12,12,.045);pointer-events:none;user-select:none}

/* ============================================================
   CHAIN (#chain)
   ============================================================ */
.ab-chain{position:relative;background:var(--ink);color:#fff;padding:clamp(80px,10vw,150px) 0;overflow:hidden}
.ab-chain__bgword{position:absolute;top:6px;left:0;white-space:nowrap;font-family:var(--f-display);
  font-size:clamp(80px,13vw,190px);line-height:1;color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.06);pointer-events:none}
.ab-chain .sec-head__eng{color:#fff}
.ab-chain .sec-head__jp{color:#fff}
.ab-chain .sec-head__side{color:rgba(255,255,255,.5)}
.ab-chain__copy{font-size:clamp(13.5px,1.35vw,15px);line-height:2.3;color:rgba(255,255,255,.85);margin-bottom:clamp(40px,5.5vw,70px)}
.ab-chain__copy b{color:#fff}
.ab-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.14);counter-reset:step}
@media(max-width:960px){.ab-flow{grid-template-columns:1fr}}
.ab-step{position:relative;background:var(--ink);padding:clamp(24px,2.6vw,36px) clamp(18px,1.8vw,26px);overflow:hidden;
  opacity:0;transform:translateY(30px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.ab-flow.in .ab-step{opacity:1;transform:none}
.ab-flow.in .ab-step:nth-child(1){transition-delay:.05s}
.ab-flow.in .ab-step:nth-child(2){transition-delay:.2s}
.ab-flow.in .ab-step:nth-child(3){transition-delay:.35s}
.ab-flow.in .ab-step:nth-child(4){transition-delay:.5s}
.ab-flow.in .ab-step:nth-child(5){transition-delay:.65s}
.ab-step__no{font-family:var(--f-display);font-size:clamp(38px,4vw,54px);line-height:1;color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.5)}
.ab-step:last-child .ab-step__no{color:var(--accent);-webkit-text-stroke:0}
.ab-step h4{margin-top:16px;font-size:clamp(15px,1.5vw,18px);font-weight:900;letter-spacing:.03em}
.ab-step p{margin-top:8px;font-size:12px;line-height:1.9;color:rgba(255,255,255,.65)}
.ab-step__arr{position:absolute;top:50%;right:7px;transform:translateY(-50%);z-index:2;color:var(--accent);font-family:var(--f-label);font-size:15px}
.ab-step:last-child .ab-step__arr{display:none}
@media(max-width:960px){
  .ab-step__arr{top:auto;right:auto;left:24px;bottom:7px;transform:rotate(90deg)}
}
.ab-chain__en{margin-top:clamp(30px,4vw,50px);text-align:right;font-family:var(--f-display);font-size:clamp(14px,1.8vw,22px);
  letter-spacing:.12em;color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.35)}

/* ---------- 挑戦者フェイス・マーキー（TOPへの導線） ---------- */
.ab-faces{background:var(--ink);color:#fff;padding-bottom:clamp(80px,10vw,140px);overflow:hidden}
.ab-faces__band{position:relative;overflow:hidden;padding:6px 0}
.ab-faces__track{display:flex;gap:14px;width:max-content;animation:abFaces 36s linear infinite}
.ab-faces__band:hover .ab-faces__track{animation-play-state:paused}
@keyframes abFaces{to{transform:translateX(-50%)}}
.ab-face{flex:0 0 auto;width:clamp(150px,16vw,220px);aspect-ratio:4/3;background-size:cover;background-position:center;
  filter:grayscale(70%);transition:filter .5s var(--ease);position:relative}
.ab-face:hover{filter:grayscale(0)}
.ab-face::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(0,0,0,.5))}
.ab-faces__cta{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:clamp(26px,3.4vw,42px);
  font-family:var(--f-label);font-size:12px;letter-spacing:.28em}
.ab-faces__cta .arr{display:inline-flex;width:44px;height:44px;border:1px solid rgba(255,255,255,.5);border-radius:50%;
  align-items:center;justify-content:center;transition:.4s var(--ease)}
.ab-faces__cta:hover .arr{background:var(--accent);border-color:var(--accent);transform:translateX(6px)}

/* ============================================================
   SYSTEM (#system)
   ============================================================ */
.ab-system{position:relative;padding:clamp(80px,10vw,150px) 0 0;overflow:clip}
.ab-system__ghost{position:absolute;top:clamp(6px,1.2vw,22px);left:clamp(6px,1.4vw,26px);font-family:var(--f-min);font-weight:800;
  font-size:clamp(140px,22vw,320px);line-height:1.06;color:rgba(12,12,12,.04);pointer-events:none;user-select:none}
.ab-system__catch{font-family:var(--f-min);font-weight:800;font-size:clamp(22px,3vw,38px);line-height:1.8;letter-spacing:.04em;margin-bottom:clamp(16px,2vw,24px)}
.ab-system__lead{font-size:clamp(13.5px,1.35vw,15px);line-height:2.3;color:var(--ink-soft);margin-bottom:clamp(40px,5.5vw,70px)}
.ab-system__lead a{color:var(--accent);font-weight:700;border-bottom:1px solid currentColor;padding-bottom:1px}
.ab-prods{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(14px,1.8vw,24px)}
@media(max-width:860px){.ab-prods{grid-template-columns:1fr}}
.ab-prod{position:relative;background:var(--paper);border:1px solid var(--line);padding:clamp(26px,3vw,42px) clamp(20px,2.4vw,34px);overflow:hidden;
  transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.ab-prod:hover{transform:translateY(-6px);box-shadow:0 22px 46px rgba(0,0,0,.1)}
.ab-prod::before{content:"";position:absolute;left:0;bottom:0;width:100%;height:4px;background:var(--accent);
  transform:scaleX(0);transform-origin:0 50%;transition:transform .5s var(--ease)}
.ab-prod:hover::before{transform:scaleX(1)}
.ab-prod__no{font-family:var(--f-display);font-size:clamp(40px,4.4vw,58px);line-height:1;color:transparent;-webkit-text-stroke:1.2px rgba(12,12,12,.3);transition:.4s}
.ab-prod:hover .ab-prod__no{-webkit-text-stroke-color:var(--accent)}
.ab-prod h4{margin-top:16px;font-size:clamp(16px,1.8vw,21px);font-weight:900;line-height:1.65;letter-spacing:.02em}
.ab-prod p{margin-top:12px;font-size:13px;font-weight:500;line-height:2.1;color:var(--ink-soft)}
.ab-prod__link{display:inline-flex;align-items:center;gap:10px;margin-top:18px;font-family:var(--f-label);font-size:11px;letter-spacing:.2em;color:var(--ink)}
.ab-prod__link:hover{color:var(--accent)}

/* 自社制作タグ・マーキー */
.ab-inhouse{margin-top:clamp(54px,7vw,90px);background:var(--ink);color:#fff;padding:clamp(20px,2.6vw,30px) 0;overflow:hidden}
.ab-inhouse__label{text-align:center;font-family:var(--f-label);font-size:10px;letter-spacing:.34em;color:rgba(255,255,255,.55);margin-bottom:14px}
.ab-inhouse__track{display:flex;width:max-content;animation:abTags 24s linear infinite}
@keyframes abTags{to{transform:translateX(-50%)}}
.ab-inhouse__unit{display:flex;align-items:center;white-space:nowrap}
.ab-inhouse__unit span{font-family:var(--f-jp);font-weight:900;font-size:clamp(15px,1.8vw,20px);letter-spacing:.06em;padding:0 18px}
.ab-inhouse__unit i{width:8px;height:8px;background:var(--accent);border-radius:50%;flex:0 0 auto}

/* ============================================================
   CREW
   ============================================================ */
.ab-crew{position:relative;padding:clamp(80px,10vw,140px) 0;background:var(--bg-soft);overflow:hidden}
.ab-crew__bgword{position:absolute;bottom:-.18em;left:50%;transform:translateX(-50%);white-space:nowrap;
  font-family:var(--f-display);font-size:clamp(110px,18vw,260px);line-height:1;color:rgba(12,12,12,.04);user-select:none;pointer-events:none}
.ab-crew__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(14px,1.8vw,24px)}
@media(max-width:960px){.ab-crew__grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.ab-crew__grid{grid-template-columns:1fr}}
.ab-member{position:relative;background:var(--paper);border:1px solid var(--line);overflow:hidden;cursor:pointer;
  transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.ab-member:hover{transform:translateY(-8px);box-shadow:0 24px 50px rgba(0,0,0,.12)}
.ab-member::after{content:"";position:absolute;left:0;top:0;width:100%;height:4px;background:var(--accent);
  transform:scaleX(0);transform-origin:0 50%;transition:transform .5s var(--ease);z-index:2}
.ab-member:hover::after{transform:scaleX(1)}
.ab-member__photo{aspect-ratio:4/3.4;background-size:cover;background-position:center top;filter:grayscale(25%);transition:filter .5s}
.ab-member:hover .ab-member__photo{filter:grayscale(0)}
.ab-member__body{position:relative;padding:clamp(18px,2vw,26px) clamp(16px,1.8vw,22px) clamp(18px,2vw,24px)}
.ab-member__ghost{position:absolute;z-index:0;right:clamp(8px,1vw,14px);bottom:clamp(4px,.7vw,10px);
  font-family:var(--f-display);font-size:clamp(52px,5.4vw,72px);line-height:.8;color:rgba(12,12,12,.055);pointer-events:none;user-select:none}
.ab-member__role,.ab-member__name,.ab-member__quote{position:relative;z-index:1}
.ab-member__role{font-family:var(--f-label);font-size:10px;letter-spacing:.24em;color:var(--muted);text-transform:uppercase}
.ab-member__name{margin-top:8px;font-family:var(--f-display);font-size:clamp(24px,2.4vw,32px);letter-spacing:.03em;line-height:1}
.ab-member__quote{margin-top:12px;font-size:12px;line-height:1.95;font-weight:500;color:var(--ink-soft)}
.ab-member--noimg .ab-member__photo{display:none}

/* ============================================================
   MANIFESTO (#manifesto)
   ============================================================ */
.ab-mani{position:relative;background:#0a0a0a;color:#fff;padding:clamp(90px,12vw,180px) 0;overflow:hidden;text-align:center}
.ab-mani__bgword{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);white-space:nowrap;
  font-family:var(--f-display);font-size:clamp(140px,24vw,360px);line-height:1;color:rgba(255,255,255,.03);pointer-events:none}
.ab-mani__eyebrow{font-family:var(--f-label);letter-spacing:.4em;font-size:12px;color:var(--accent);margin-bottom:clamp(26px,4vw,44px)}
.ab-mani__mini{font-family:var(--f-min);font-weight:600;font-size:clamp(14px,1.9vw,22px);line-height:2.4;letter-spacing:.1em}
.ab-mani__mini .ac{color:var(--accent)}
.ab-mani__big{margin-top:clamp(28px,4.6vw,56px);font-family:var(--f-min);font-weight:800;
  font-size:clamp(30px,6.6vw,84px);line-height:1.55;letter-spacing:.06em}
.ab-mani .mline{display:block;overflow:hidden;padding:.07em 0}
.ab-mani .mline span{display:inline-block;transform:translateY(115%);transition:transform 1s cubic-bezier(.16,1,.3,1)}
.ab-mani.in-view .mline span{transform:translateY(0)}
.ab-mani.in-view .mline:nth-child(2) span{transition-delay:.14s}
.ab-mani.in-view .ab-mani__big .mline:nth-child(1) span{transition-delay:.3s}
.ab-mani.in-view .ab-mani__big .mline:nth-child(2) span{transition-delay:.46s}
@media(max-width:700px){.ab-mani__big{font-size:clamp(24px,7vw,40px)}.ab-mani__mini{letter-spacing:.05em}}

/* ============================================================
   CTA
   ============================================================ */
.ab-cta{position:relative;padding:clamp(90px,12vw,170px) 0;text-align:center;overflow:hidden}
.ab-cta__ghost{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:var(--f-display);
  font-size:clamp(180px,32vw,420px);line-height:1.1;color:rgba(226,60,27,.06);pointer-events:none;user-select:none}
.ab-cta__jp{position:relative;font-family:var(--f-min);font-weight:800;font-size:clamp(20px,3vw,36px);line-height:2;letter-spacing:.06em}
.ab-cta__btn{position:relative;display:inline-flex;align-items:center;gap:16px;margin-top:clamp(28px,4vw,44px);
  background:var(--accent);color:#fff;font-weight:900;font-size:clamp(15px,1.6vw,18px);letter-spacing:.08em;
  padding:clamp(18px,2.2vw,24px) clamp(34px,4vw,54px);border-radius:999px;overflow:hidden;
  box-shadow:0 18px 44px rgba(226,60,27,.35);transition:transform .4s var(--ease),box-shadow .4s}
.ab-cta__btn:hover{transform:translateY(-4px);box-shadow:0 26px 60px rgba(226,60,27,.45)}
.ab-cta__btn .arr{font-family:var(--f-label);transition:transform .4s var(--ease)}
.ab-cta__btn:hover .arr{transform:translateX(6px)}
.ab-cta__sub{position:relative;margin-top:18px;font-family:var(--f-label);font-size:10.5px;letter-spacing:.3em;color:var(--muted)}

/* 追加本文（固定ページ本文がある場合） */
.ab-prose{padding:0 0 clamp(80px,10vw,130px)}
.ab-prose .prose{max-width:760px;margin-inline:auto}

@media (prefers-reduced-motion: reduce){
  .rv,.cur-img::after,.cur-img .bgi,.split .ch,.ab-step,.ab-mani .mline span,.ab-what__copy .mline span{opacity:1;transform:none;transition:none}
  .ab-faces__track,.ab-inhouse__track{animation:none}
}