/* ============================================================
   FUJII YUSEI.com — v2 "PARTICLE"
   Dark / WebGL-first / Vanilla CSS design system
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
img{display:block;max-width:100%;height:auto}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

/* ---------- tokens ---------- */
:root{
  --bg:#0500ff;
  --bg2:#0300cc;
  --text:#ffffff;
  --dim:rgba(255,255,255,.7);
  --faint:rgba(255,255,255,.4);
  --line:rgba(255,255,255,.18);
  --line-soft:rgba(255,255,255,.12);
  --glass:rgba(0,0,0,.28);
  --glass-hi:rgba(0,0,0,.4);

  --accent:#ff8c00;
  --accent-soft:rgba(255,140,0,.4);
  --orange:#ff8c00;
  --teal:#00ddff;
  --yellow:#ffdd00;
  --violet:#cc88ff;

  --font-ja:"Noto Sans JP",-apple-system,BlinkMacSystemFont,sans-serif;
  --font-en:"Space Grotesk",var(--font-ja);
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --container:1180px;
  --pad:clamp(20px,4vw,44px);
  --radius:18px;
  --hdr-h:64px;
  --ease:cubic-bezier(.22,.61,.2,1);
}

/* ---------- base ---------- */
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  font-family:var(--font-ja);
  font-size:16px;line-height:1.9;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--accent);color:#fff}

.mono{font-family:var(--font-mono);letter-spacing:.08em}
.container{max-width:var(--container);margin-inline:auto;padding-inline:var(--pad)}

section{scroll-margin-top:calc(var(--hdr-h) + 8px)}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

.skip{
  position:fixed;top:10px;left:10px;z-index:300;
  padding:10px 16px;background:var(--accent);color:#fff;border-radius:8px;
  font-size:12px;transform:translateY(-200%);transition:transform .25s var(--ease);
}
.skip:focus-visible{transform:none}

/* ---------- webgl canvas & overlays ---------- */
#gl{
  position:fixed;inset:0;width:100%;height:100%;
  z-index:0;display:block;
  opacity:0;transition:opacity 1.2s ease .15s;
}
body.gl-ready #gl{opacity:1}
body.no-webgl #gl{display:none}

.grid-overlay{
  position:fixed;inset:0;z-index:1;pointer-events:none;
  background-image:
    linear-gradient(var(--line-soft) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 38%,#000 25%,transparent 78%);
          mask-image:radial-gradient(ellipse 90% 70% at 50% 38%,#000 25%,transparent 78%);
  opacity:.55;
}

main,header.hdr,footer.ftr,.dots,.marquee,.mnav{position:relative;z-index:2}

/* ---------- custom cursor ---------- */
.cursor{display:none}
@media (pointer:fine){
  body.cursor-on{cursor:none}
  body.cursor-on a,body.cursor-on button{cursor:none}
  body.cursor-on .cursor{display:block}
  .cursor{position:fixed;inset:0;z-index:400;pointer-events:none}
  .cursor__dot,.cursor__ring{
    position:absolute;top:0;left:0;border-radius:50%;
    transform:translate(-50%,-50%);
    will-change:transform;
  }
  .cursor__dot{width:6px;height:6px;background:var(--accent)}
  .cursor__ring{
    width:34px;height:34px;border:1px solid rgba(255,255,255,.4);
    transition:width .25s var(--ease),height .25s var(--ease),border-color .25s;
  }
  .cursor.is-hover .cursor__ring{width:56px;height:56px;border-color:var(--accent)}
}

/* ---------- header ---------- */
.hdr{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--hdr-h);
  transition:background .35s,border-color .35s,backdrop-filter .35s;
  border-bottom:1px solid transparent;
}
.hdr.is-scrolled{
  background:rgba(0,0,180,.72);
  -webkit-backdrop-filter:blur(14px) saturate(1.4);
          backdrop-filter:blur(14px) saturate(1.4);
  border-bottom-color:var(--line-soft);
}
.hdr__in{
  max-width:var(--container);margin-inline:auto;height:100%;
  padding-inline:var(--pad);
  display:flex;align-items:center;gap:28px;
}
.brand{font-size:14px;font-weight:500;letter-spacing:.06em}
.brand__dim{color:var(--accent)}
.hdr__clock{margin-left:auto;font-size:11px;color:var(--dim)}
.hdr__nav{display:flex;gap:26px}
.hdr__nav a{
  font-family:var(--font-en);font-size:13px;font-weight:500;color:var(--dim);
  letter-spacing:.04em;transition:color .25s;position:relative;
}
.hdr__nav a::after{
  content:"";position:absolute;left:0;bottom:-6px;height:1px;width:100%;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.hdr__nav a:hover,.hdr__nav a.is-active{color:var(--text)}
.hdr__nav a:hover::after,.hdr__nav a.is-active::after{transform:scaleX(1)}
.nav-toggle{display:none;font-size:12px;letter-spacing:.18em;padding:8px 2px}

.progress{
  position:absolute;left:0;bottom:-1px;height:2px;width:100%;
  background:linear-gradient(90deg,var(--accent),var(--teal));
  transform:scaleX(0);transform-origin:left;
}

/* ---------- mobile nav ---------- */
.mnav{
  position:fixed;inset:0;z-index:90;
  background:rgba(6,6,11,.92);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  display:flex;flex-direction:column;justify-content:center;gap:8vh;
  padding:0 9vw;
  opacity:0;visibility:hidden;transition:opacity .35s var(--ease),visibility .35s;
}
body.nav-open .mnav{opacity:1;visibility:visible}
body.nav-open{overflow:hidden}
.mnav__links{display:flex;flex-direction:column;gap:6px}
.mnav__links a{
  display:flex;align-items:baseline;gap:18px;
  font-family:var(--font-en);font-size:clamp(30px,9vw,44px);font-weight:700;
  padding:8px 0;color:var(--text);
  opacity:0;transform:translateY(14px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}
.mnav__links a .mono{font-size:12px;color:var(--accent)}
body.nav-open .mnav__links a{opacity:1;transform:none}
body.nav-open .mnav__links a:nth-child(2){transition-delay:.04s}
body.nav-open .mnav__links a:nth-child(3){transition-delay:.08s}
body.nav-open .mnav__links a:nth-child(4){transition-delay:.12s}
body.nav-open .mnav__links a:nth-child(5){transition-delay:.16s}
body.nav-open .mnav__links a:nth-child(6){transition-delay:.2s}
.mnav__meta{font-size:11px;color:var(--dim)}

/* ---------- dots ---------- */
.dots{
  position:fixed;right:26px;top:50%;transform:translateY(-50%);
  z-index:80;display:flex;flex-direction:column;gap:16px;
}
.dots a{display:flex;align-items:center;gap:10px;flex-direction:row-reverse}
.dots i{
  width:7px;height:7px;border-radius:50%;
  background:rgba(255,255,255,.28);
  transition:background .3s,transform .3s,box-shadow .3s;
}
.dots span{
  font-size:10px;color:var(--dim);opacity:0;transform:translateX(6px);
  transition:opacity .25s,transform .25s;white-space:nowrap;
}
.dots a:hover span{opacity:1;transform:none}
.dots a.is-active i{
  background:var(--accent);transform:scale(1.5);
  box-shadow:0 0 12px var(--accent-soft);
}
.dots a.is-active span{opacity:1;transform:none;color:var(--text)}

/* ---------- hero ---------- */
.hero{
  min-height:100svh;
  display:flex;flex-direction:column;justify-content:center;
  padding-top:var(--hdr-h);
  position:relative;
}
.hero__in{width:100%}
.hero__frame{
  display:inline-block;
  border:1.5px solid rgba(255,255,255,.45);
  padding:clamp(26px,4.5vw,54px);
  max-width:clamp(320px,72vw,780px);
}
.hero__title{
  font-family:var(--font-en);font-weight:700;
  font-size:clamp(70px,13.5vw,182px);
  line-height:.88;letter-spacing:-.025em;
  margin:0;
}
.hero__ln{display:block}
.hero__com{
  display:block;
  font-family:var(--font-en);
  font-style:italic;font-weight:700;
  font-size:clamp(34px,6.5vw,88px);
  line-height:1.05;letter-spacing:-.02em;
  margin-top:.1em;
}
.hero__com::before{
  content:"";display:inline-block;
  width:.18em;height:.18em;border-radius:50%;
  background:var(--accent);
  vertical-align:middle;margin-right:.07em;
  position:relative;top:-.14em;
}
.hero__rule{
  border:none;border-top:1.5px solid rgba(255,255,255,.35);
  margin:clamp(18px,3.2vw,36px) 0;
}
.hero__meta{
  display:grid;grid-template-columns:auto 1fr;
  gap:0 clamp(16px,2.8vw,34px);align-items:start;
}
.hero__name{
  font-family:var(--font-ja);
  font-size:clamp(14px,1.7vw,19px);font-weight:700;
  white-space:nowrap;margin:0;padding-top:3px;
}
.hero__desc{
  margin:0;font-family:var(--font-ja);
  font-size:clamp(12px,1.3vw,14px);
  color:rgba(255,255,255,.72);line-height:1.88;
}
.hero__foot{
  position:absolute;left:0;right:0;bottom:0;
  display:flex;justify-content:space-between;align-items:center;
  padding:14px var(--pad);
  border-top:1px solid rgba(255,255,255,.2);
  font-size:11px;color:rgba(255,255,255,.5);letter-spacing:.14em;
}

/* ---------- marquee ---------- */
.marquee{
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
  overflow:hidden;padding:14px 0;
  background:rgba(6,6,11,.4);
}
.marquee__track{
  display:flex;white-space:nowrap;width:max-content;
  animation:marquee 30s linear infinite;
  font-size:12px;color:var(--dim);letter-spacing:.22em;
}
@keyframes marquee{to{transform:translateX(-50%)}}

/* ---------- sections ---------- */
.section{padding:clamp(96px,13vh,170px) 0}
.section--last{padding-bottom:clamp(120px,16vh,200px)}

.sec-head{max-width:760px}
.kicker{
  font-size:12px;color:var(--accent);letter-spacing:.24em;
  display:flex;align-items:center;gap:14px;
}
.kicker::after{content:"";flex:0 0 56px;height:1px;background:currentColor;opacity:.5}
.kicker--orange{color:var(--orange)}
.kicker--teal{color:var(--teal)}
.kicker--yellow{color:var(--yellow)}
.kicker--violet{color:var(--violet)}
.sec-title{
  font-size:clamp(36px,5.4vw,58px);font-weight:900;line-height:1.25;
  letter-spacing:.01em;margin:16px 0 18px;
}
.lede{color:var(--dim);font-size:clamp(14px,1.6vw,15.5px)}
.sec-more{margin-top:38px}

/* ---------- buttons / chips ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 26px;border-radius:999px;
  font-size:14px;font-weight:700;letter-spacing:.04em;
  transition:transform .3s var(--ease),box-shadow .3s,background .3s,border-color .3s;
}
.btn--fill{background:var(--accent);color:#fff}
.btn--fill:hover{transform:translateY(-2px);box-shadow:0 10px 34px var(--accent-soft)}
.btn--ghost{border:1px solid rgba(255,255,255,.25);color:var(--text)}
.btn--ghost:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 8px 26px rgba(91,118,255,.18)}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips li{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--dim);
  border:1px solid var(--line);border-radius:999px;
  padding:6px 13px;
}

/* ---------- facts ---------- */
.facts{
  margin-top:46px;
  border-top:1px solid var(--line);
}
.facts__row{
  display:grid;grid-template-columns:150px 1fr;gap:18px;
  padding:20px 4px;border-bottom:1px solid var(--line-soft);
  align-items:baseline;
}
.facts__row dt{font-size:11px;color:var(--accent);letter-spacing:.18em}
.facts__row dd{font-size:14.5px}

/* ---------- stats ---------- */
.stats{
  margin-top:54px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
}
.stats__item{
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;
  display:flex;flex-direction:column;gap:8px;
  transition:border-color .3s,background .3s,transform .3s var(--ease);
}
.stats__item:hover{border-color:var(--accent-soft);background:var(--glass-hi);transform:translateY(-3px)}
.stats__num{
  font-family:var(--font-en);font-size:clamp(38px,4.6vw,52px);font-weight:700;line-height:1;
}
.stats__num i{font-style:normal;font-family:var(--font-ja);font-size:.36em;font-weight:700;color:var(--dim);margin-left:4px}
.stats__label{font-size:10.5px;color:var(--dim);letter-spacing:.1em}

/* ---------- feature (media / podcast) ---------- */
.feature{
  margin-top:46px;
  display:grid;grid-template-columns:1.15fr 1fr;gap:clamp(28px,4vw,56px);
  align-items:center;
}
.feature--rev .feature__visual{order:2}
.feature--rev .feature__body{order:1}
.feature__visual{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--radius);
  border:1px solid var(--line);
  background:var(--bg2);
  transform-style:preserve-3d;
  transition:border-color .35s,box-shadow .35s;
}
.feature__visual img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .8s var(--ease)}
.feature__visual--square img{aspect-ratio:1/1;object-fit:contain;padding:8%}
.feature__visual:hover{border-color:var(--accent-soft);box-shadow:0 24px 70px rgba(0,0,0,.5)}
.feature__visual:hover img{transform:scale(1.04)}
.feature__badge{
  position:absolute;top:14px;left:14px;
  font-size:10px;letter-spacing:.16em;color:var(--text);
  background:rgba(6,6,11,.65);border:1px solid var(--line);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  padding:7px 12px;border-radius:999px;
}
.feature__body{display:flex;flex-direction:column;gap:20px;align-items:flex-start}
.feature__desc{color:var(--dim);font-size:14.5px}

/* ---------- app cards ---------- */
.apps{
  margin-top:46px;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:clamp(16px,2vw,24px);
}
.app-card{
  position:relative;
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;
  transform-style:preserve-3d;
  transition:border-color .35s,background .35s,box-shadow .35s;
}
.app-card:hover{
  border-color:var(--accent-soft);background:var(--glass-hi);
  box-shadow:0 24px 60px rgba(0,0,0,.45);
}
.app-card__hit{position:absolute;inset:0;z-index:3}
.app-card__visual{overflow:hidden;border-bottom:1px solid var(--line-soft)}
.app-card__visual img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .7s var(--ease)}
.app-card:hover .app-card__visual img{transform:scale(1.06)}
.app-card__visual--placeholder{display:flex;align-items:center;justify-content:center;aspect-ratio:4/3;background:linear-gradient(135deg,rgba(91,118,255,.15) 0%,rgba(63,224,197,.10) 100%)}
.app-card__label-lg{font-size:clamp(1.6rem,4vw,2.4rem);letter-spacing:.18em;color:var(--accent);opacity:.7}
.app-card__visual--seiji{display:flex;flex-direction:column;justify-content:center;gap:10px;padding:18px 20px;aspect-ratio:4/3;background:#f0ebe3;border-bottom:1px solid rgba(0,0,0,.12)}
.seiji__sub{font-family:var(--font-ja);font-size:10px;color:#888;letter-spacing:.04em;line-height:1.5}
.seiji__copy{font-family:"Noto Serif JP","游明朝","Yu Mincho",serif;font-size:clamp(13px,3.2vw,20px);font-weight:700;color:#1a1a1a;line-height:1.55;letter-spacing:.02em}
.app-card__body{padding:20px 20px 22px;display:flex;flex-direction:column;gap:9px}
.app-card__cat{font-size:10px;color:var(--accent);letter-spacing:.2em}
.app-card__title{font-size:16.5px;font-weight:700;line-height:1.5}
.app-card__desc{font-size:12.5px;line-height:1.85;color:var(--dim)}
.app-card__link{
  margin-top:6px;font-size:11px;letter-spacing:.18em;color:var(--text);
  display:flex;align-items:center;gap:8px;
}
.app-card__link span{transition:transform .3s var(--ease);color:var(--accent)}
.app-card:hover .app-card__link span{transform:translate(3px,-3px)}

/* ---------- writing posts ---------- */
.posts{margin-top:46px;border-top:1px solid var(--line)}
.post{
  display:grid;grid-template-columns:64px 1fr auto 30px;gap:22px;
  align-items:center;
  padding:26px 8px;border-bottom:1px solid var(--line-soft);
  transition:background .3s,padding .3s var(--ease);
}
.post:hover{background:rgba(255,255,255,.035);padding-inline:18px}
.post__no{font-size:11px;color:var(--accent)}
.post__main{display:flex;flex-direction:column;gap:5px}
.post__title{font-size:clamp(15.5px,2vw,18.5px);font-weight:700;line-height:1.6}
.post__desc{font-size:12.5px;color:var(--dim)}
.post__tag{font-size:10px;color:var(--dim);letter-spacing:.14em;white-space:nowrap}
.post__arrow{
  font-size:16px;color:var(--accent);
  transition:transform .3s var(--ease);
}
.post:hover .post__arrow{transform:translate(4px,-4px)}

/* ---------- connect ---------- */
.connect{
  margin-top:46px;
  display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,22px);
}
.connect__card{
  display:flex;flex-direction:column;gap:34px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;
  position:relative;
  transform-style:preserve-3d;
  transition:border-color .35s,background .35s,box-shadow .35s;
}
.connect__card:hover{
  border-color:var(--accent-soft);background:var(--glass-hi);
  box-shadow:0 24px 60px rgba(0,0,0,.45);
}
.connect__name{font-family:var(--font-en);font-size:clamp(24px,3vw,32px);font-weight:700}
.connect__handle{font-size:12px;color:var(--dim)}
.connect__arrow{
  position:absolute;top:24px;right:24px;color:var(--accent);font-size:18px;
  transition:transform .3s var(--ease);
}
.connect__card:hover .connect__arrow{transform:translate(4px,-4px)}

/* ---------- footer ---------- */
.ftr{border-top:1px solid var(--line);padding:46px 0 40px;background:rgba(6,6,11,.55)}
.ftr__top{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.ftr__brand{font-size:13px}
.ftr__nav{display:flex;gap:22px;flex-wrap:wrap}
.ftr__nav a{font-family:var(--font-en);font-size:12.5px;color:var(--dim);transition:color .25s}
.ftr__nav a:hover{color:var(--text)}
.ftr__base{
  margin-top:30px;padding-top:24px;border-top:1px solid var(--line-soft);
  display:flex;flex-direction:column;gap:8px;
  font-size:10px;color:var(--dim);letter-spacing:.1em;
}
#sysStatus{color:var(--teal)}
body.no-webgl #sysStatus{color:var(--orange)}

/* ---------- reveal ---------- */
body.js .reveal{
  opacity:0;transform:translateY(26px);
  transition:opacity .8s var(--ease) var(--d,0s),transform .8s var(--ease) var(--d,0s);
}
body.js .reveal.is-in{opacity:1;transform:none}

/* ---------- tilt ---------- */
[data-tilt]{will-change:transform}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .dots{display:none}
  .hdr__clock{display:none}
}
@media (max-width:860px){
  .hdr__nav{display:none}
  .nav-toggle{display:block}
  .feature{grid-template-columns:1fr}
  .feature--rev .feature__visual{order:0}
  .feature--rev .feature__body{order:1}
  .stats{grid-template-columns:repeat(2,1fr)}
  .connect{grid-template-columns:1fr}
  .connect__card{flex-direction:row;align-items:center;justify-content:space-between;gap:14px}
  .connect__card .connect__arrow{position:static}
  .post{grid-template-columns:1fr 30px;grid-template-areas:"no no" "main arrow" "tag tag";row-gap:10px}
  .post__no{grid-area:no}
  .post__main{grid-area:main}
  .post__tag{grid-area:tag}
  .post__arrow{grid-area:arrow}
}
@media (max-width:560px){
  .facts__row{grid-template-columns:1fr;gap:6px;padding:16px 2px}
  .stats{grid-template-columns:1fr 1fr;gap:10px}
  .stats__item{padding:20px 16px}
  .hero__foot{flex-wrap:wrap;gap:14px;row-gap:8px}
  .hero__scroll{display:none}
  .btn{padding:13px 22px;font-size:13.5px}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  .marquee__track{animation:none}
  .hero__scroll i{animation:none}
  body.js .reveal{transition:none;opacity:1;transform:none}
  .btn,.app-card,.connect__card,.stats__item,.post,.feature__visual img,.app-card__visual img{transition:none}
  #gl{transition:none}
}