/* NEXTRAY LAB — 光の実験室
   地は夜。背景の空（WebGL）が、読み進めるほど夜明けへ移る。
   色は NEXTRAY のブランド（青 #1e9bff・シアン #12d4d0・アンバー #f6a94a）。 */

:root{
  --night:#04060d;
  --ink:#e9eef9;
  --ink-2:#a9b4c9;
  --ink-3:#6d7890;
  --blue:#1e9bff;
  --cyan:#12d4d0;
  --amber:#f6a94a;
  --grad:linear-gradient(100deg,#1e9bff 0%,#12d4d0 48%,#f6a94a 100%);
  --jp:"Noto Sans JP",system-ui,sans-serif;
  --en:"Manrope","Noto Sans JP",system-ui,sans-serif;
  --gut:clamp(16px,4vw,56px);
  --ease:cubic-bezier(.16,1,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--night);color:var(--ink);
  font-family:var(--jp);font-feature-settings:"palt";letter-spacing:.02em;
  line-height:1.8;overflow-x:clip;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,p{margin:0}
a{color:inherit;text-decoration:none}
::selection{background:rgba(30,155,255,.45);color:#fff}
.num,.exp-no,.card-no,.loader-num{font-family:var(--en);font-variant-numeric:lining-nums tabular-nums}

/* ---------- 空・粒状感 ---------- */
#sky{position:fixed;inset:0;width:100%;height:100%;z-index:0;display:block}
.grain{
  position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
main{position:relative;z-index:2}

/* ---------- 読み込み ---------- */
.loader{
  position:fixed;inset:0;z-index:100;background:var(--night);
  display:grid;place-items:center;align-content:center;gap:18px;
  transition:clip-path 1.1s var(--ease),visibility 0s 1.2s;
  clip-path:inset(0 0 0 0);
}
.loader.done{clip-path:inset(0 0 100% 0);visibility:hidden}
.loader-ray{width:min(420px,70vw);height:1px;background:rgba(255,255,255,.08);position:relative;overflow:hidden}
.loader-ray i{position:absolute;inset:0;background:var(--grad);transform-origin:left;transform:scaleX(var(--p,0));box-shadow:0 0 18px #12d4d0}
.loader-num{font-size:clamp(44px,9vw,96px);font-weight:200;letter-spacing:.06em;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.loader-cap{font-family:var(--en);font-size:11px;letter-spacing:.5em;color:var(--ink-3);padding-left:.5em}

/* ---------- カーソル ---------- */
.cursor{position:fixed;left:0;top:0;z-index:90;pointer-events:none;display:none}
.has-mouse .cursor{display:block}
.has-mouse, .has-mouse a, .has-mouse canvas{cursor:none}
.cursor i{position:absolute;left:0;top:0;border-radius:50%;will-change:transform}
.cursor-dot{width:6px;height:6px;margin:-3px 0 0 -3px;background:#fff;box-shadow:0 0 12px 3px rgba(130,220,255,.9)}
.cursor-ring{width:38px;height:38px;margin:-19px 0 0 -19px;border:1px solid rgba(255,255,255,.35);
  transition:width .4s var(--ease),height .4s var(--ease),margin .4s var(--ease),border-color .3s,background .3s}
.cursor.on-link .cursor-ring{width:72px;height:72px;margin:-36px 0 0 -36px;border-color:rgba(18,212,208,.8);background:rgba(18,212,208,.08)}
.cursor.on-drag .cursor-ring{width:56px;height:56px;margin:-28px 0 0 -28px;border-style:dashed;border-color:rgba(246,169,74,.8)}

/* ---------- 上の帯・右のレール ---------- */
.top{
  position:fixed;z-index:50;left:0;right:0;top:0;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px var(--gut);
  pointer-events:none;
}
.top > *{pointer-events:auto}
.brand{display:flex;align-items:center;gap:10px}
.brand svg{width:104px;height:auto;display:block}
.brand span{font-family:var(--en);font-weight:700;font-size:11px;letter-spacing:.3em;color:var(--ink-2);padding:3px 6px 3px 8px;border:1px solid rgba(255,255,255,.18);border-radius:3px}
.exp-nav{display:flex;gap:4px;padding:5px;border-radius:999px;background:rgba(10,14,26,.45);border:1px solid rgba(255,255,255,.08);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.exp-nav a{display:flex;align-items:baseline;gap:6px;padding:6px 12px;border-radius:999px;font-size:12px;color:var(--ink-2);transition:background .3s,color .3s}
.exp-nav b{font-family:var(--en);font-weight:600;font-size:10px;letter-spacing:.08em;color:var(--ink-3);transition:color .3s}
.exp-nav a:hover,.exp-nav a.now{background:rgba(255,255,255,.08);color:#fff}
.exp-nav a.now b{color:var(--cyan)}

.rail{position:fixed;z-index:50;right:clamp(10px,1.6vw,24px);top:50%;height:min(44vh,360px);width:1px;transform:translateY(-50%);background:rgba(255,255,255,.1)}
.rail i{position:absolute;left:0;top:0;width:1px;height:100%;background:linear-gradient(#1e9bff,#12d4d0 48%,#f6a94a);transform-origin:top;transform:scaleY(var(--p,0));box-shadow:0 0 10px rgba(18,212,208,.8)}

/* ---------- 文字の出かた ---------- */
.split .ch{display:inline-block;opacity:0;transform:translateY(.55em) rotate(4deg);filter:blur(10px);
  transition:opacity 1s var(--ease),transform 1.2s var(--ease),filter 1s var(--ease);transition-delay:calc(var(--i) * 45ms + var(--d,0ms))}
.split.in .ch{opacity:1;transform:none;filter:none}
.rv{opacity:0;transform:translateY(18px);transition:opacity 1.1s var(--ease) .35s,transform 1.2s var(--ease) .35s}
.in .rv,.rv.in{opacity:1;transform:none}

/* ---------- ヒーロー ---------- */
.hero{min-height:100svh;display:grid;align-content:center;padding:120px var(--gut) 140px;position:relative}
.hero-in{max-width:1100px}
.kicker{font-family:var(--en);font-size:12px;font-weight:600;letter-spacing:.32em;color:var(--ink-2);margin-bottom:28px}
.kicker em{font-style:normal;color:var(--ink-3);margin:0 .4em}
.hero h1{
  font-size:clamp(46px,10.5vw,168px);font-weight:900;line-height:1.08;letter-spacing:-.02em;
  word-break:keep-all;overflow-wrap:anywhere;
}
.hero h1 .ch{background:linear-gradient(100deg,#fff 0%,#dff4ff 40%,#bff3ef 70%,#ffe2bb 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{margin-top:28px;font-size:clamp(15px,1.6vw,20px);color:var(--ink-2);letter-spacing:.12em}
.hint{position:absolute;left:var(--gut);bottom:44px;font-size:12px;color:var(--ink-3);letter-spacing:.14em;display:flex;align-items:center;gap:10px}
.hint::before{content:"";width:8px;height:8px;border-radius:50%;background:#fff;box-shadow:0 0 12px 3px rgba(130,220,255,.9)}
.hint-sp{display:none}
.is-touch .hint-pc{display:none}
.is-touch .hint-sp{display:inline}
.scroll-cue{position:absolute;right:var(--gut);bottom:40px;display:flex;flex-direction:column;align-items:center;gap:12px}
.scroll-cue i{width:1px;height:64px;background:rgba(255,255,255,.15);position:relative;overflow:hidden}
.scroll-cue i::after{content:"";position:absolute;left:0;top:-30%;width:1px;height:30%;background:var(--cyan);box-shadow:0 0 8px var(--cyan);animation:cue 2.2s var(--ease) infinite}
.scroll-cue span{font-family:var(--en);font-size:10px;letter-spacing:.3em;color:var(--ink-3);writing-mode:vertical-rl}
@keyframes cue{to{top:100%}}

/* ---------- 実験の節（共通） ---------- */
.exp{position:relative}
.exp-prism,.exp-particles{height:320vh}
.exp-trail{height:240vh}
.exp-weight{height:220vh}
.sticky{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden}
.stage{position:absolute;inset:0;width:100%;height:100%;display:block}
.exp-head{position:absolute;left:var(--gut);bottom:clamp(28px,7vh,72px);max-width:520px;pointer-events:none}
.exp-no{font-size:12px;font-weight:600;letter-spacing:.28em;color:var(--ink-2);margin-bottom:10px}
.exp-no em{font-style:normal;color:var(--ink-3);margin-left:.6em;letter-spacing:.32em}
.exp h2,.cards-head h2{font-size:clamp(56px,9vw,128px);font-weight:900;line-height:1;letter-spacing:-.01em}
.exp h2 .ch,.cards-head h2 .ch{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;background-size:var(--bw,200%) 100%;background-position:var(--bx,0) 0}
.exp-cap{margin-top:18px;font-size:clamp(16px,1.7vw,21px);font-weight:500;letter-spacing:.06em;word-break:keep-all;overflow-wrap:anywhere}
.exp-do{margin-top:12px;display:inline-flex;align-items:center;gap:8px;font-size:12px;color:var(--ink-3);letter-spacing:.12em;word-break:keep-all;overflow-wrap:anywhere}
.exp-do::before{content:"";flex:none;width:18px;height:1px;background:var(--amber);box-shadow:0 0 6px var(--amber)}
.exp-particles .exp-head{bottom:auto;top:clamp(84px,14vh,140px)}

/* ---------- 03 反射（カード） ---------- */
.exp-cards{padding:clamp(120px,18vh,200px) var(--gut) clamp(120px,18vh,200px)}
.cards-head{max-width:640px;margin-bottom:clamp(48px,8vh,88px)}
.deck{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,44px);max-width:1180px;margin:0 auto;perspective:1100px}
.card{
  --rx:0deg;--ry:0deg;--mx:50%;--my:50%;--o:0;
  aspect-ratio:5/7;border-radius:22px;position:relative;
  transform:rotateX(var(--rx)) rotateY(var(--ry));transform-style:preserve-3d;
  transition:transform .8s var(--ease);
  touch-action:pan-y;
}
.card.live{transition:transform .12s linear}
.card-in{
  position:absolute;inset:0;border-radius:inherit;overflow:hidden;
  background:
    radial-gradient(120% 80% at 50% 0%,rgba(30,155,255,.22),transparent 60%),
    linear-gradient(160deg,#0d1424,#070a14 60%,#0b0f1c);
  border:1px solid rgba(255,255,255,.12);
  box-shadow:0 30px 60px -20px rgba(0,0,0,.8),inset 0 1px 0 rgba(255,255,255,.08);
  display:flex;flex-direction:column;justify-content:flex-end;padding:clamp(18px,2.2vw,28px);
}
.card-in::before{ /* 箔 */
  content:"";position:absolute;inset:0;pointer-events:none;mix-blend-mode:color-dodge;opacity:calc(.1 + var(--o) * .55);
  background:
    repeating-linear-gradient(115deg,
      hsl(200 100% 60% / .0) 0%, hsl(190 100% 60% / .55) 6%, hsl(160 90% 60% / .5) 12%,
      hsl(45 100% 60% / .5) 18%, hsl(330 90% 65% / .45) 24%, hsl(260 90% 70% / .5) 30%, hsl(200 100% 60% / .0) 36%);
  background-size:260% 260%;
  background-position:var(--mx) var(--my);
  filter:saturate(1.2);
}
.card-in::after{ /* 照り返し */
  content:"";position:absolute;inset:0;pointer-events:none;mix-blend-mode:overlay;opacity:calc(.2 + var(--o) * .8);
  background:radial-gradient(circle at var(--mx) var(--my),rgba(255,255,255,.75),rgba(255,255,255,.12) 28%,transparent 55%);
}
.card-art{position:absolute;left:12%;right:12%;top:12%;width:76%;height:auto;transform:translateZ(40px);filter:drop-shadow(0 0 10px rgba(18,212,208,.45))}
.card-no{position:relative;font-size:11px;letter-spacing:.3em;color:var(--ink-3)}
.card h3{position:relative;font-family:var(--en);font-size:clamp(28px,3.2vw,44px);font-weight:800;letter-spacing:.14em;line-height:1.1;margin-top:6px}
.card-jp{position:relative;font-size:13px;color:var(--ink-2);letter-spacing:.2em;margin-top:4px}

/* ---------- 04 残光 ---------- */
.exp-trail .stage{touch-action:pan-y}

/* ---------- 05 濃淡 ---------- */
.weight-in{position:absolute;inset:0;display:grid;place-content:center;justify-items:center;text-align:center;padding:0 var(--gut)}
.wtext{
  font-size:clamp(40px,8.4vw,132px);line-height:1.25;font-weight:100;letter-spacing:.02em;margin:18px 0 10px;
  word-break:keep-all;
}
.wtext .w{display:inline-block;font-variation-settings:"wght" var(--w,100);font-weight:var(--w,100);
  color:var(--c,#9fd8ff);
  text-shadow:0 0 calc(var(--k,0) * 30px) var(--g,transparent);
  transform:translateY(calc(var(--k,0) * -6px));
}
.wtext-en{font-family:var(--en);font-size:clamp(16px,2.4vw,30px);letter-spacing:.5em;padding-left:.5em;color:var(--ink-3);margin-bottom:22px}
.wtext-en .w{display:inline-block;font-weight:var(--w,200);color:var(--c,#6d7890)}

/* ---------- 夜明け ---------- */
.finale{min-height:100svh;display:grid;grid-template-rows:1fr auto;padding:0 var(--gut)}
.finale-in{align-self:center;max-width:1000px;margin:0 auto;padding:160px 0 80px;text-align:center}
.logo-wipe{width:min(720px,84vw);margin:0 auto 56px;clip-path:inset(0 100% 0 0);transition:clip-path 1.8s var(--ease) .2s}
.logo-wipe.in{clip-path:inset(0 0 0 0)}
.logo-wipe svg{display:block;width:100%;height:auto}
.finale h2{font-size:clamp(34px,6vw,84px);font-weight:900;line-height:1.2;letter-spacing:-.01em;word-break:keep-all;overflow-wrap:anywhere}
.finale-p{word-break:keep-all;overflow-wrap:anywhere;margin:30px auto 0;max-width:640px;color:var(--ink-2);font-size:clamp(14px,1.4vw,16px);line-height:2.1;text-wrap:balance}
.cta{margin-top:44px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{position:relative;display:inline-flex;align-items:center;gap:14px;padding:18px 34px;border-radius:999px;font-weight:700;letter-spacing:.1em;font-size:15px;transition:box-shadow .4s,background .4s}
.btn span,.btn i{position:relative;pointer-events:none}
.btn i{font-style:normal;font-family:var(--en);transition:transform .4s var(--ease)}
.btn-main{color:#04101c;background:var(--grad);box-shadow:0 10px 40px -10px rgba(18,212,208,.6)}
.btn-main:hover{box-shadow:0 14px 60px -8px rgba(18,212,208,.9)}
.btn-main:hover i{transform:translateX(4px)}
.btn-sub{color:var(--ink);border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.04)}
.btn-sub:hover{background:rgba(255,255,255,.1)}
.foot{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:28px 0 32px;border-top:1px solid rgba(255,255,255,.18);font-family:var(--en);font-size:11px;letter-spacing:.14em;color:rgba(255,255,255,.82);text-shadow:0 1px 8px rgba(0,0,0,.45)}

/* ---------- 狭い画面 ---------- */
@media (max-width:900px){
  .exp-nav span{display:none}
  .exp-nav a{padding:6px 9px}
  .deck{grid-template-columns:1fr;max-width:380px}
}
@media (max-width:600px){
  .top{padding:14px var(--gut)}
  .brand svg{width:86px}
  .brand span{font-size:9px}
  .exp-nav{gap:0;padding:3px}
  .exp-nav a{padding:6px 7px}
  .rail{display:none}
  .hero{padding-bottom:160px}
  .scroll-cue{bottom:36px}
  .hint{bottom:48px;max-width:60vw}
  .exp-head{right:var(--gut)}
  .finale-p br{display:none}
  .btn{padding:16px 26px}
  .foot{justify-content:center;text-align:center}
}
@media (max-height:560px){
  .exp-head{bottom:20px}
  .exp h2{font-size:clamp(40px,7vw,80px)}
}