:root{
  --night:#04070F;
  --depth:#0A1424;
  --ice:#E8F2FA;
  --glacier:#8FD8FF;
  --fog:#5A7A99;
  --aurora:#A8F0CE;
  --ember:#FFA94D;
  --disp:'Syne',sans-serif;
  --ja:'Zen Kaku Gothic New',sans-serif;
  --mono:'IBM Plex Mono',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
/* body だけの overflow-x:hidden は iOS Safari が無視して横パンできてしまう */
html{scroll-behavior:smooth;overflow-x:hidden}
body{
  background:var(--night);
  color:var(--ice);
  font-family:var(--ja);
  font-weight:400;
  line-height:1.9;
  overflow-x:hidden;
}
/* 高さは 100vh 固定（bottom:0 にしない）: iOS はアドレスバーの伸縮で fixed 要素の
   高さが変わり WebGL がリサイズされてクマが一瞬拡大して見える。vh はバー伸縮でも
   不変（large viewport 基準）なので、スクロール中のリサイズ自体が起きなくなる */
#gl{position:fixed;top:0;left:0;width:100%;height:100vh;z-index:0;background:radial-gradient(ellipse 140% 90% at 60% -10%,#0B1B33 0%,var(--night) 60%)}
.grain{
  position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
}

/* ---------- header ---------- */
header{
  position:fixed;top:0;left:0;right:0;z-index:10;
  display:flex;justify-content:space-between;align-items:center;
  padding:26px 5vw;
  mix-blend-mode:screen;
}
.logo{
  font-family:var(--disp);font-weight:800;font-size:20px;
  letter-spacing:.14em;color:var(--ice);text-decoration:none;
}
.logo span{color:var(--glacier)}
nav{display:flex;gap:32px}
nav a{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;
  color:var(--fog);text-decoration:none;transition:color .3s;
}
nav a:hover,nav a:focus-visible{color:var(--glacier)}
a:focus-visible{outline:1px solid var(--glacier);outline-offset:4px}

/* language switch — lives outside nav so it survives the mobile nav hide */
.head-right{display:flex;align-items:center;gap:30px}
.lang{
  display:flex;align-items:center;
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
}
.lang>*{color:var(--fog);text-decoration:none;transition:color .3s}
.lang>*+*{margin-left:11px;padding-left:11px;border-left:1px solid rgba(232,242,250,.18)}
.lang a:hover,.lang a:focus-visible{color:var(--glacier)}
.lang .cur{color:var(--ice)}

/* ---------- progress rail ---------- */
.rail{
  position:fixed;left:4vw;top:50%;transform:translateY(-50%);
  z-index:9;height:42vh;width:1px;background:rgba(232,242,250,.12);
}
.rail-fill{position:absolute;top:0;left:0;width:1px;height:0%;background:var(--glacier);transition:height .15s linear}
.rail-stop{
  position:absolute;left:-2.5px;width:6px;height:6px;border-radius:50%;
  background:var(--fog);transition:background .3s,box-shadow .3s;
}
.rail-stop.on{background:var(--glacier);box-shadow:0 0 12px var(--glacier)}
.rail-label{
  position:absolute;left:14px;top:-4px;font-family:var(--mono);
  font-size:9px;letter-spacing:.22em;color:var(--fog);white-space:nowrap;
}

/* ---------- sections ---------- */
main{position:relative;z-index:2}
section{
  min-height:100vh;display:flex;align-items:center;
  padding:14vh 8vw 14vh 14vw;position:relative;
  /* .inner::before と .kanji の装飾はみ出しを発生源で断つ。
     hidden だと overflow-y が auto に化けて各セクションが縦スクロール化するため clip 固定 */
  overflow-x:clip;
}
.inner{max-width:640px;position:relative}
.inner::before{
  content:"";position:absolute;inset:-12% -18%;z-index:-1;border-radius:40%;
  background:radial-gradient(ellipse at center,rgba(4,7,15,.82) 0%,rgba(4,7,15,.45) 55%,transparent 78%);
}
.eyebrow{
  font-family:var(--mono);font-size:11px;letter-spacing:.3em;
  color:var(--glacier);margin-bottom:26px;display:flex;align-items:center;gap:14px;
}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--glacier);opacity:.6}
h1,h2{font-weight:700;letter-spacing:.02em}
h1{font-size:clamp(38px,5.4vw,72px);line-height:1.32}
h2{font-size:clamp(28px,3.6vw,46px);line-height:1.4;margin-bottom:30px}
.latin{font-family:var(--disp);font-weight:800;letter-spacing:.05em}
.lead{color:#B9CDDD;font-size:clamp(15px,1.2vw,17px);max-width:34em;margin-top:28px}
.muted{color:var(--fog)}

/* hero */
#hero .inner{max-width:760px}
.hero-sub{
  margin-top:34px;font-family:var(--mono);font-size:12px;
  letter-spacing:.2em;color:var(--fog);
}
.scroll-cue{
  position:absolute;bottom:6vh;left:14vw;display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:10px;letter-spacing:.3em;color:var(--fog);
}
.scroll-cue i{
  display:block;width:1px;height:52px;background:linear-gradient(var(--glacier),transparent);
  animation:drop 2.2s ease-in-out infinite;
}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}45%{transform:scaleY(1);transform-origin:top}55%{transform:scaleY(1);transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* concept */
#concept{justify-content:flex-end}
#concept .inner{max-width:560px}
.kanji{
  position:absolute;right:60%;top:50%;transform:translateY(-50%);
  font-size:clamp(200px,34vw,480px);font-weight:700;line-height:1;
  color:transparent;-webkit-text-stroke:1px rgba(143,216,255,.14);
  user-select:none;pointer-events:none;font-family:var(--ja);
}

/* services */
.cards{display:grid;gap:18px;margin-top:44px}
.card{
  border:1px solid rgba(232,242,250,.1);
  background:rgba(10,20,36,.52);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  padding:30px 32px;border-radius:4px;
  transition:border-color .4s,transform .4s;
}
.card:hover{border-color:rgba(143,216,255,.4);transform:translateX(6px)}
.tag{
  font-family:var(--mono);font-size:10px;letter-spacing:.26em;
  color:var(--aurora);display:inline-block;margin-bottom:12px;
}
.card h3{font-size:19px;font-weight:700;margin-bottom:10px}
.card p{font-size:14px;color:#A9BFD1;line-height:1.95}
.card-head{display:flex;align-items:center;gap:18px;margin-bottom:14px}
.card-head .tag{margin-bottom:6px}
.card-head h3{margin-bottom:0}
.svc-icon{
  width:52px;height:52px;flex-shrink:0;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid rgba(143,216,255,.28);
  background:linear-gradient(145deg,rgba(143,216,255,.14),rgba(10,20,36,.6));
  color:var(--glacier);
}
.svc-icon svg{width:26px;height:26px;display:block}

/* works — つくったサービス（SERVICES 内の目玉） */
.works{margin-top:72px}
.works-head{
  font-family:var(--mono);font-size:11px;letter-spacing:.3em;
  color:var(--aurora);display:flex;align-items:center;gap:14px;
}
.works-head::before{content:"";width:34px;height:1px;background:var(--aurora);opacity:.6}
.works-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:26px}
.work{
  display:flex;flex-direction:column;gap:10px;
  padding:22px 22px 24px;border-radius:6px;
  text-decoration:none;color:inherit;
  border:1px solid rgba(143,216,255,.26);
  background:linear-gradient(160deg,rgba(143,216,255,.10),rgba(10,20,36,.62) 58%);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  transition:border-color .35s,transform .35s,box-shadow .35s;
}
.work:hover,.work:focus-visible{
  border-color:rgba(143,216,255,.65);transform:translateY(-4px);
  box-shadow:0 14px 34px rgba(4,7,15,.5),0 0 26px rgba(143,216,255,.16);
}
.work:hover h3{color:var(--glacier)}
.work-top{display:flex;align-items:center;gap:14px}
.work .s-icon{
  width:44px;height:44px;flex-shrink:0;border-radius:10px;display:block;
  border:1px solid rgba(232,242,250,.16);
  background:rgba(232,242,250,.05);object-fit:cover;
}
.work .paw{
  display:block;font-family:var(--mono);font-size:10px;
  letter-spacing:.24em;color:var(--aurora);margin-bottom:3px;
}
.work h3{font-size:16px;font-weight:700;line-height:1.5}
.work p{font-size:12.5px;color:#A9BFD1;line-height:1.9}
.work .ext{margin-left:8px;font-size:12px;color:var(--glacier);opacity:.75}

/* other footprints — リンクなしの実績は控えめなリストで続ける */
.works-sub{
  margin-top:56px;font-family:var(--mono);font-size:11px;letter-spacing:.3em;
  color:var(--fog);display:flex;align-items:center;gap:14px;
}
.works-sub::before{content:"";width:34px;height:1px;background:var(--fog);opacity:.6}
.steps{margin-top:18px;border-top:1px solid rgba(232,242,250,.1)}
.step{
  display:flex;gap:22px;align-items:center;
  padding:24px 4px;border-bottom:1px solid rgba(232,242,250,.1);
}
.step .s-icon{
  width:40px;height:40px;flex-shrink:0;border-radius:10px;display:block;
  border:1px solid rgba(232,242,250,.14);
  background:rgba(232,242,250,.04);object-fit:cover;
}
.step span.s-icon{
  display:flex;align-items:center;justify-content:center;
  color:var(--glacier);
}
.step span.s-icon svg{width:20px;height:20px;display:block}
.step .paw{font-family:var(--mono);font-size:11px;color:var(--glacier);letter-spacing:.14em;min-width:86px}
.step h3{font-size:16px;font-weight:500;flex:1}
.step p{font-size:13px;color:var(--fog);max-width:22em}

/* contact */
#contact .inner{text-align:left}
.cta{
  display:inline-block;margin-top:38px;padding:18px 46px;
  font-family:var(--ja);font-weight:700;font-size:15px;letter-spacing:.1em;
  color:var(--night);background:var(--glacier);text-decoration:none;border-radius:2px;
  transition:box-shadow .4s,transform .3s;
}
.cta:hover{box-shadow:0 0 34px rgba(143,216,255,.55);transform:translateY(-2px)}
.profile-link{
  display:inline-block;font-weight:700;font-size:14px;color:inherit;text-decoration:none;
  padding-bottom:2px;border-bottom:1px solid var(--ember);
  transition:color .3s,border-color .3s;
}
.profile-link:hover,.profile-link:focus-visible{
  color:var(--ice);border-color:#FFC48A;
}
.socials{display:flex;gap:28px;margin-top:34px}
.socials a{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--fog);text-decoration:none}
.socials a:hover{color:var(--glacier)}
footer{
  position:relative;z-index:2;padding:40px 8vw 46px 14vw;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--fog);
  border-top:1px solid rgba(232,242,250,.08);background:rgba(4,7,15,.6);
}

/* reveal */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s ease,transform .9s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:820px){
  .rail{display:none}
  nav{display:none}
  section{padding:14vh 7vw}
  .scroll-cue{left:7vw}
  .kanji{right:auto;left:-6vw;opacity:.7}
  #concept{justify-content:flex-start}
  .works{margin-top:56px}
  .works-grid{grid-template-columns:1fr}
  .works-sub{margin-top:48px}
  .work h3{font-size:15px;line-height:1.6}
  .step{flex-direction:column;align-items:flex-start;gap:6px;padding:22px 0}
  .step .paw{min-width:0}
  .step h3{font-size:15px;line-height:1.7}
  .step p{max-width:none;font-size:12.5px}
  .step .s-icon{width:34px;height:34px;border-radius:8px;margin-bottom:4px}
  .card-head{gap:14px}
  .svc-icon{width:44px;height:44px}
  .svc-icon svg{width:22px;height:22px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .scroll-cue i{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
}