/* ===========================================================
   pH12.4 LP  —  style.css
   =========================================================== */

:root{
  --bg:#ffffff;
  --bg-alt:#f6f7f8;
  --ink:#14161a;
  --ink-2:#5c6167;
  --ink-3:#8d9298;
  --line:#e4e6e8;
  --line-2:#d6d9dc;
  --accent:#2f5fa8;
  --accent-soft:#eef3f9;
  --wrap:1120px;
  --pad:clamp(20px,5vw,48px);
  --sec-y:clamp(72px,10vw,140px);
  --jp:"Noto Sans JP",-apple-system,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
  --en:"Jost","Noto Sans JP",Helvetica,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--jp);font-weight:400;font-size:16px;line-height:1.95;
  letter-spacing:.02em;-webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
p{margin:0 0 1.2em}
p:last-child{margin-bottom:0}
ul,ol,dl,dd{margin:0;padding:0;list-style:none}
h1,h2,h3{margin:0;font-weight:500;line-height:1.5;letter-spacing:.04em}
b{font-weight:700}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}
.wrap--narrow{max-width:860px}
.sp{display:none}
@media(max-width:767px){ .sp{display:inline} }

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .9s cubic-bezier(.22,.7,.3,1),transform .9s cubic-bezier(.22,.7,.3,1)}
.reveal.is-in{opacity:1;transform:none}
.no-js .reveal{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.7em;
  padding:1.05em 2.1em;border-radius:999px;
  font-size:14px;letter-spacing:.1em;line-height:1;font-weight:500;
  border:1px solid transparent;transition:.35s ease;
}
.btn .ico{width:18px;height:18px;flex:none;transition:transform .35s ease}
.btn:hover .ico{transform:translateX(4px)}
.btn--dark{background:var(--ink);color:#fff}
.btn--dark:hover{background:#000}
.btn--ghost{border-color:var(--line-2);color:var(--ink)}
.btn--ghost:hover{border-color:var(--ink);background:var(--ink);color:#fff}
.btn--light{background:#fff;color:var(--ink)}
.btn--light:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(0,0,0,.18)}

/* ===========================================================
   header
   =========================================================== */
.hd{
  position:fixed;inset:0 0 auto 0;z-index:100;
  background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;transition:border-color .3s,background .3s;
}
.hd.is-scrolled{border-bottom-color:var(--line)}
.hd__in{
  max-width:1320px;margin-inline:auto;padding:0 var(--pad);
  height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.hd__logo{display:flex;align-items:center;flex:none}
.hd__logo img{width:auto;height:38px}
.hd__logo-mark{font-family:var(--en);font-size:21px;font-weight:400;letter-spacing:.01em;line-height:1}
.hd__logo-mark b{font-weight:500;margin-left:.12em}
.hd__logo-sub{font-family:var(--en);font-size:9.5px;letter-spacing:.22em;color:var(--ink-3);line-height:1;text-transform:uppercase}
.hd__nav{display:flex;align-items:center;gap:clamp(14px,2vw,30px)}
.hd__nav a{font-family:var(--jp);font-size:14px;letter-spacing:.08em;color:var(--ink-2);transition:color .25s}
.hd__nav a:hover{color:var(--ink)}
.hd__cta{
  padding:.72em 1.6em;border:1px solid var(--ink);border-radius:999px;
  color:var(--ink)!important;font-size:13px!important;letter-spacing:.1em!important;
}
.hd__cta:hover{background:var(--ink);color:#fff!important}
.hd__burger{display:none;width:44px;height:44px;margin-right:-10px;background:none;border:0;padding:0;cursor:pointer}
.hd__burger span{display:block;width:22px;height:1.4px;background:var(--ink);margin:5px auto;transition:.35s}
.hd__burger[aria-expanded="true"] span:nth-child(1){transform:translateY(6.4px) rotate(45deg)}
.hd__burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.hd__burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.4px) rotate(-45deg)}

@media(max-width:900px){
  .hd__burger{display:block}
  .hd__nav{
    position:fixed;inset:72px 0 auto 0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;padding:10px var(--pad) 30px;
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:.3s ease;
  }
  .hd__nav.is-open{transform:none;opacity:1;pointer-events:auto}
  .hd__logo img{height:31px}
  .hd__nav a{padding:16px 2px;border-bottom:1px solid var(--line);font-size:16px}
  .hd__cta{margin-top:22px;text-align:center;border-bottom:0!important;font-size:14px!important}
}

/* ===========================================================
   hero
   =========================================================== */
.hero{position:relative;padding:132px 0 90px;overflow:hidden}
.hero__bg{
  position:absolute;inset:auto 0 -2% 0;display:flex;gap:.1em;
  font-family:var(--en);font-size:clamp(140px,24vw,340px);font-weight:300;line-height:.82;
  color:#f2f3f4;white-space:nowrap;pointer-events:none;user-select:none;
}
.hero__in{
  position:relative;z-index:1;
  max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad);
  display:grid;grid-template-columns:1fr .74fr;align-items:center;gap:clamp(20px,4vw,60px);
  min-height:min(76vh,640px);
}
.hero__eyebrow{
  font-family:var(--en);font-size:12px;letter-spacing:.32em;text-transform:uppercase;
  color:var(--ink-3);margin:0 0 26px;
}
.hero__eyebrow::before{content:"";display:inline-block;width:34px;height:1px;background:var(--line-2);vertical-align:middle;margin-right:14px}
.hero__title{font-size:clamp(29px,4.4vw,50px);line-height:1.45;letter-spacing:.05em;font-weight:500}
.hero__title-jp{display:block}
.hero__lead{margin:30px 0 0;color:var(--ink-2);font-size:clamp(14px,1.5vw,16px);line-height:2.1;font-weight:300}
.hero__acts{display:flex;flex-wrap:wrap;gap:14px;margin-top:40px}
.hero__visual{display:flex;justify-content:center}
.hero__visual img{width:min(100%,330px);filter:drop-shadow(0 26px 46px rgba(20,25,35,.10))}
.hero__scroll{
  position:absolute;left:50%;bottom:18px;transform:translateX(-50%);z-index:2;
  font-family:var(--en);font-size:10.5px;letter-spacing:.3em;color:var(--ink-3);text-transform:uppercase;
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.hero__scroll::after{content:"";width:1px;height:52px;background:linear-gradient(var(--line-2),transparent)}
@media(max-width:860px){
  .hero{padding:104px 0 76px}
  .hero__in{grid-template-columns:1fr;min-height:0;gap:34px}
  .hero__visual{order:-1}
  .hero__visual img{width:min(58%,240px)}
  .hero__scroll{display:none}
}

/* ---------- lead ---------- */
.lead{padding:var(--sec-y) 0;border-top:1px solid var(--line)}
.lead__big{
  font-size:clamp(21px,3.1vw,34px);line-height:1.85;letter-spacing:.05em;font-weight:500;
  margin:0 0 34px;
}
.lead__txt{max-width:760px;color:var(--ink-2);font-weight:300;font-size:15px}

/* ===========================================================
   section common
   =========================================================== */
.sec{padding:var(--sec-y) 0;border-top:1px solid var(--line)}
.sec--alt{background:var(--bg-alt)}
.sec__hd{margin-bottom:clamp(38px,5vw,64px)}
.sec__ttl{
  font-size:clamp(26px,4.4vw,48px);line-height:1.45;letter-spacing:.07em;
  font-weight:500;color:var(--ink);margin:0 0 18px;
}
.sec__en{
  font-family:var(--en);font-weight:400;font-size:12.5px;
  letter-spacing:.28em;text-transform:uppercase;color:var(--ink-3);margin:0;
  display:flex;align-items:center;gap:14px;
}
.sec__en::before{content:"";width:30px;height:1px;background:var(--line-2);flex:none}
.sec__en--light{color:rgba(255,255,255,.55);justify-content:center}
.sec__en--light::before{background:rgba(255,255,255,.28)}
.sec__catch{
  font-size:clamp(18px,2.3vw,25px);line-height:1.85;letter-spacing:.05em;font-weight:500;
  margin:0 0 clamp(34px,4vw,54px);
}
.h3{font-size:17px;letter-spacing:.06em;margin:0 0 14px}
.note{margin-top:26px;font-size:12.5px;color:var(--ink-3);font-weight:300;line-height:1.9}

.cols{display:grid;grid-template-columns:1fr 1fr;gap:clamp(26px,4vw,60px)}
.cols__c p{color:var(--ink-2);font-weight:300;font-size:15px;line-height:2.05}
@media(max-width:767px){ .cols{grid-template-columns:1fr} }

/* ---------- pillars ---------- */
.pillars{
  display:grid;grid-template-columns:repeat(4,1fr);
  border:1px solid var(--line);border-radius:4px;overflow:hidden;
  margin:0 0 clamp(40px,5vw,68px);background:#fff;
}
.pillars li{
  padding:clamp(24px,3vw,38px) 10px;text-align:center;
  border-right:1px solid var(--line);
}
.pillars li:last-child{border-right:0}
.pillars__en{display:block;font-family:var(--en);font-size:11px;letter-spacing:.22em;color:var(--ink-3);text-transform:uppercase;margin-bottom:10px}
.pillars__jp{display:block;font-size:clamp(19px,2.4vw,26px);letter-spacing:.14em;font-weight:500}
@media(max-width:767px){
  .pillars{grid-template-columns:1fr 1fr}
  .pillars li:nth-child(2n){border-right:0}
  .pillars li:nth-child(-n+2){border-bottom:1px solid var(--line)}
}

/* ---------- chart ---------- */
.chart{margin:0 0 clamp(40px,5vw,64px);padding:clamp(18px,3vw,34px);background:#fff;border:1px solid var(--line);border-radius:4px;overflow-x:auto}
.chart img{min-width:620px;margin-inline:auto}
.chart__cap{margin-top:18px;font-size:12.5px;line-height:1.9;color:var(--ink-3);font-weight:300;text-align:center}
@media(max-width:700px){
  .chart img{min-width:0;width:100%;max-width:340px}
  .chart__cap{text-align:left}
}

/* ---------- features ---------- */
.feat{border-top:1px solid var(--line)}
.feat__i{border-bottom:1px solid var(--line)}
.feat__hd{
  width:100%;display:flex;align-items:center;gap:clamp(14px,2.4vw,28px);
  padding:clamp(22px,2.8vw,30px) 4px;background:none;border:0;cursor:pointer;
  font-family:inherit;text-align:left;color:inherit;transition:opacity .25s;
}
.feat__hd:hover{opacity:.58}
.feat__ico{width:30px;height:30px;flex:none;color:var(--accent)}
.feat__t{flex:1;font-size:clamp(15px,2vw,19px);letter-spacing:.05em;font-weight:500;line-height:1.6}
.feat__n{
  font-family:var(--en);font-size:13px;letter-spacing:.1em;color:var(--ink-3);flex:none;
  position:relative;padding-right:30px;
}
.feat__n::after,.feat__n::before{
  content:"";position:absolute;right:0;top:50%;background:var(--ink-2);transition:.35s ease;
}
.feat__n::before{width:13px;height:1px;margin-top:-.5px}
.feat__n::after{width:1px;height:13px;right:6px;margin-top:-6.5px}
.feat__hd[aria-expanded="true"] .feat__n::after{transform:rotate(90deg);opacity:0}
.feat__bd{display:grid;grid-template-rows:0fr;transition:grid-template-rows .45s cubic-bezier(.3,.8,.3,1)}
.feat__bd>p{overflow:hidden;margin:0;color:var(--ink-2);font-weight:300;font-size:15px;line-height:2.05}
.feat__i.is-open .feat__bd{grid-template-rows:1fr}
.feat__i.is-open .feat__bd>p{padding:0 0 clamp(26px,3vw,34px) calc(30px + clamp(14px,2.4vw,28px));max-width:900px}
@media(max-width:600px){
  .feat__i.is-open .feat__bd>p{padding-left:0}
}

/* ---------- scene ---------- */
.scene{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.scene li{background:#fff;padding:clamp(26px,3vw,40px)}
.scene__n{display:block;font-family:var(--en);font-size:12px;letter-spacing:.2em;color:var(--accent);margin-bottom:16px}
.scene h3{font-size:17px;letter-spacing:.06em;margin:0 0 12px}
.scene p{color:var(--ink-2);font-weight:300;font-size:14.5px;line-height:1.95;margin:0}
@media(max-width:900px){ .scene{grid-template-columns:1fr 1fr} }
@media(max-width:600px){ .scene{grid-template-columns:1fr} }

/* ---------- faq ---------- */
.faq{border-top:1px solid var(--line)}
.faq__i{border-bottom:1px solid var(--line)}
.faq__q{
  width:100%;display:flex;align-items:flex-start;gap:16px;
  padding:clamp(20px,2.4vw,26px) 40px clamp(20px,2.4vw,26px) 4px;
  background:none;border:0;cursor:pointer;font-family:inherit;color:inherit;
  text-align:left;font-size:15.5px;line-height:1.75;letter-spacing:.04em;font-weight:500;
  position:relative;transition:opacity .25s;
}
.faq__q:hover{opacity:.58}
.faq__q::before{content:"Q";font-family:var(--en);color:var(--accent);font-size:15px;flex:none;line-height:1.75}
.faq__q::after{
  content:"";position:absolute;right:6px;top:calc(clamp(20px,2.4vw,26px) + 10px);
  width:9px;height:9px;border-right:1px solid var(--ink-2);border-bottom:1px solid var(--ink-2);
  transform:rotate(45deg);transition:transform .35s ease;
}
.faq__q[aria-expanded="true"]::after{transform:rotate(-135deg)}
.faq__a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .4s cubic-bezier(.3,.8,.3,1)}
.faq__a>p{overflow:hidden;margin:0;color:var(--ink-2);font-weight:300;font-size:14.5px;line-height:2}
.faq__i.is-open .faq__a{grid-template-rows:1fr}
.faq__i.is-open .faq__a>p{padding:0 40px clamp(22px,2.6vw,28px) 31px}
.faq__a a{color:var(--accent);border-bottom:1px solid currentColor}
@media(max-width:600px){ .faq__i.is-open .faq__a>p{padding-left:0;padding-right:10px} }

/* ---------- information ---------- */
.info__logo{margin:0 0 clamp(28px,3.5vw,42px)}
.info__logo img{width:min(200px,50vw);height:auto}
.info{border-top:1px solid var(--line-2)}
.info>div{display:grid;grid-template-columns:200px 1fr;gap:20px;padding:22px 4px;border-bottom:1px solid var(--line-2)}
.info dt{font-size:13.5px;letter-spacing:.14em;color:var(--ink-3);font-weight:400}
.info dd{font-size:15px;font-weight:400;line-height:1.85}
.info dd a{border-bottom:1px solid var(--line-2)}
.info dd a:hover{border-bottom-color:var(--ink)}
@media(max-width:600px){ .info>div{grid-template-columns:1fr;gap:6px;padding:18px 2px} }

/* ---------- contact ---------- */
.contact{background:var(--ink);color:#fff;padding:var(--sec-y) 0;text-align:center}
.contact .sec__en{margin:0 0 36px}
.contact__t{font-size:clamp(25px,3.6vw,40px);letter-spacing:.08em;line-height:1.5;margin:0 0 18px}
.contact__lead{color:rgba(255,255,255,.66);font-weight:300;font-size:14.5px;line-height:2.1;margin:0 0 40px}
.contact .btn--light{font-size:clamp(17px,2.2vw,21px);letter-spacing:.06em;padding:.95em 1.9em;font-family:var(--en)}
.contact .btn--light .ico{width:20px;height:20px}
.contact .btn--light:hover .ico{transform:none}
.contact__sub{margin:24px 0 0;font-size:13px;letter-spacing:.08em;color:rgba(255,255,255,.5);font-weight:300}

/* ---------- footer ---------- */
.ft{padding:clamp(44px,6vw,70px) 0 34px;background:#0e1013;color:rgba(255,255,255,.62)}
.ft__in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.1);margin-bottom:26px}
.ft__brand{display:flex;flex-direction:column;gap:3px;color:#fff}
.ft__brand .hd__logo-mark{font-family:var(--en);font-size:21px;font-weight:400;letter-spacing:.01em;line-height:1}
.ft__brand .hd__logo-sub{color:rgba(255,255,255,.45)}
.ft__nav{display:flex;flex-wrap:wrap;gap:clamp(14px,2vw,26px)}
.ft__nav a{font-family:var(--jp);font-size:13px;letter-spacing:.08em;color:rgba(255,255,255,.62);transition:color .25s}
.ft__nav a:hover{color:#fff}
.ft__note{font-size:11.5px;line-height:1.95;font-weight:300;color:rgba(255,255,255,.42);margin:0 0 18px}
.ft__cr{font-family:var(--en);font-size:11.5px;letter-spacing:.12em;color:rgba(255,255,255,.42);margin:0}