/* スキーマのAI研究所 — llschema.com の地色に、軌道と実験ノートのモチーフ */
:root{
  --ink:#171717;
  --sub:#5f5f5a;
  --paper:#fafaf8;
  --line:#d5d5d1;
  --sans:Arial,'Helvetica Neue','Noto Sans JP',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --mincho:'BIZ UDPMincho','Hiragino Mincho ProN','Yu Mincho',serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:clip}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.9;-webkit-font-smoothing:antialiased;overflow-x:clip}
a{color:inherit;text-decoration:none}
a:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--ink);outline-offset:6px}
img{max-width:100%;display:block}
p{margin:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:fixed;left:20px;top:-100px;background:#fff;padding:12px;z-index:50}.skip:focus{top:10px}
.mono{font-family:var(--mono);font-size:11px;letter-spacing:.06em;line-height:1.6}

/* ---------- header ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:30;display:flex;align-items:center;gap:48px;padding:22px 4%;background:linear-gradient(var(--paper) 55%,rgba(250,250,248,0))}
.mark{font-weight:700;font-size:20px;letter-spacing:-.04em;line-height:1}
.mark span{font-family:var(--mono);font-weight:400;font-size:11px;letter-spacing:.06em;margin-left:10px;color:var(--sub)}
.site-header nav{display:flex;gap:36px;font-size:14px;margin-right:auto}
.site-header nav a:hover{text-decoration:underline;text-underline-offset:6px}
.atom{width:40px;height:40px;display:block}
.atom svg{width:100%;height:100%;overflow:visible}
.atom ellipse{fill:none;stroke:var(--ink);stroke-width:1}
.atom g{transform-origin:20px 20px}
.atom .o1{animation:spin 9s linear infinite}.atom .o2{animation:spin 13s linear infinite reverse}
.atom:hover .o1,.atom:hover .o2{animation-duration:1.6s}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- hero ---------- */
.hero{position:relative;padding:120px 4% 0}
.hero-top{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}
.hero-top h1{margin:0;font-size:clamp(64px,10.5vw,170px);line-height:.9;letter-spacing:-.065em;font-weight:700}
.hero-top h1 .outline{color:transparent;-webkit-text-stroke:1.5px var(--ink)}
.hero-top .meta{text-align:right;padding-bottom:.6vw}
.hero-top .meta p+p{margin-top:4px}

.kv{position:relative;margin:30px -4% 0;overflow:hidden}
.kv-art{display:block;width:100%;height:auto;overflow:visible}
.kv-fan path,.kv-beam{fill:none;stroke:var(--ink);stroke-width:1.15;stroke-linecap:round}
.kv-beam{stroke-dasharray:1 1}
.kv-flow path{fill:none;stroke-width:2.6;stroke-linecap:round;stroke-dasharray:.05 .035;opacity:0;transition:opacity .6s ease}
.kv-flow path.on{opacity:.95}
.kv-word{font-family:var(--mono);font-size:18px;fill:var(--ink);letter-spacing:.02em;cursor:pointer;transition:fill .4s}
.kv-word:focus{outline:none}
.kv-word:focus-visible{text-decoration:underline}
.hint{margin:8px 4% 0;color:var(--sub)}
.fig{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin:0 4%;padding:10px 0 0;border-top:1px solid var(--line);color:var(--sub)}
.fig b{color:var(--ink);font-weight:700;margin-right:10px}
.fig output{color:var(--ink);font-variant-numeric:tabular-nums}

.hero-copy{display:grid;grid-template-columns:1fr auto;align-items:end;gap:40px;padding:110px 0 140px}
.lead{margin:0;font-family:var(--mincho);font-weight:700;font-size:clamp(36px,5.4vw,86px);line-height:1.35;letter-spacing:-.01em}
.lead .outline{display:block;color:transparent;-webkit-text-stroke:1.2px var(--ink);font-weight:700}
.hero-copy .en{text-align:right;color:var(--sub)}

/* ---------- orbit（軌道） ---------- */
.orbits{position:absolute;inset:0;pointer-events:none;overflow:visible}
.orbits svg{width:100%;height:100%;overflow:visible}
.orbits ellipse{fill:none;stroke:var(--ink);stroke-width:1;vector-effect:non-scaling-stroke}
.orbits .spin{transform-box:view-box;transform-origin:50% 50%;animation:spin var(--dur,40s) linear infinite}
.orbits .rev{animation-direction:reverse}
.orbits .e{fill:var(--ink)}

.intro{position:relative;max-width:1100px;margin:0 auto 170px;padding:120px 8%;text-align:center}
.intro .orbits{inset:-40px -2%}
.intro .statement{position:relative;font-family:var(--mincho);font-size:clamp(20px,2.2vw,32px);line-height:1.8;font-weight:700}
.intro .statement-en{position:relative;margin-top:14px;color:var(--sub)}
.intro .operator{position:relative;margin-top:30px;font-size:13px}
.intro .operator a{border-bottom:1px solid;padding-bottom:2px}
.intro p{text-shadow:0 0 4px var(--paper),0 0 8px var(--paper),0 0 14px var(--paper),0 0 20px var(--paper)}

/* ---------- sections ---------- */
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px;border-top:1px solid #aaa;padding:22px 0 26px;margin:0 4%}
.sec-head h2{margin:0;font-size:clamp(28px,3vw,44px);letter-spacing:-.05em;line-height:1.1}
.sec-head h2 .no{font-family:var(--mono);font-weight:400;font-size:12px;letter-spacing:.06em;margin-right:18px;vertical-align:.6em}
.sec-head h2 small{font-size:12px;font-weight:400;letter-spacing:0;margin-left:18px}

.about{padding:0 0 160px}
.about-body{display:grid;grid-template-columns:1fr 1.4fr;gap:6%;margin:30px 4% 0}
.about-body .big{font-family:var(--mincho);font-weight:700;font-size:clamp(22px,2.2vw,32px);line-height:1.7}
.about-body .text p{font-size:15px;line-height:2.1}
.about-body .text p+p{margin-top:1.6em}

/* ---------- experiments ---------- */
.experiments{padding:0 0 140px}
.board{list-style:none;margin:40px 4% 0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:64px 32px}
.spec{min-width:0}
.spec>a{display:block}
.specimen{position:relative;aspect-ratio:1;display:grid;place-items:center}
.specimen .disc{position:absolute;inset:17%;border-radius:50%;border:1px solid var(--line);background:#fff;transition:transform .6s cubic-bezier(.2,.8,.2,1)}
.specimen img{position:relative;max-width:50%;max-height:26%;width:auto;height:auto;object-fit:contain;transition:transform .6s cubic-bezier(.2,.8,.2,1)}
.specimen img.tall{max-height:40%}
.specimen .orbits .spin{--dur:26s}
.spec:nth-child(3n+1) .specimen .orbits .spin{--dur:31s}
.spec:nth-child(3n+2) .specimen .orbits .spin{--dur:22s}
.spec>a:hover .orbits .spin{animation-duration:4s}
.spec>a:hover .disc{transform:scale(1.04)}
.spec>a:hover .specimen img{transform:scale(1.06)}
.spec .cap{margin-top:10px;border-top:1px solid var(--line);padding-top:12px}
.spec .cap .mono{display:flex;justify-content:space-between;color:var(--sub)}
.spec h3{margin:6px 0 0;font-size:19px;letter-spacing:-.03em;line-height:1.4}
.spec .motive{margin-top:10px;font-size:13px;line-height:1.85;color:#333}
.spec .motive .mono{display:block;font-size:10px;color:var(--sub);margin-bottom:2px}
.featured .disc{border-color:var(--ink);box-shadow:0 0 0 5px var(--paper),0 0 0 6px var(--ink)}
.featured .cap{border-top-color:var(--ink)}
.featured .cap>.mono span:first-child{color:var(--ink)}
.spec .open{display:inline-block;margin-top:12px}
.spec .open span{display:inline-block;transition:transform .3s}
.spec>a:hover .open span{transform:translateX(5px)}
.spec>a:hover h3{text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:1px}

/* ---------- 回る文字バッジ ---------- */
.badge{position:fixed;right:22px;bottom:22px;z-index:25;width:118px;height:118px;border-radius:50%;background:var(--paper);box-shadow:0 0 0 1px var(--line)}
.badge svg{width:100%;height:100%;overflow:visible}
.badge .ring{transform-origin:59px 59px;animation:spin 22s linear infinite}
.badge text{font-family:var(--mono);font-size:9.6px;letter-spacing:.18em;fill:var(--ink)}
.badge .n{font-family:var(--sans);font-size:30px;font-weight:700;letter-spacing:-.05em}
.badge:hover .ring{animation-duration:5s}

/* ---------- footer ---------- */
footer{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:24px;margin:0 4%;padding:40px 0 160px;border-top:1px solid #aaa}
footer .mark{font-size:36px}
footer p{font-size:12px;line-height:1.8}
footer a.co{border-bottom:1px solid}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity 1s ease,transform 1.1s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}

@media(max-width:1100px){.board{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){
  .site-header{padding:16px 6%;gap:20px}
  .site-header nav{display:none}
  .mark span{display:none}
  .atom{margin-left:auto}
  .hero{padding:90px 6% 0}
  .hero-top .meta{text-align:left}
  .kv{margin:20px -6% 0}
  .kv-art{width:140%;margin-left:-20%}
  .kv-word{font-size:30px}
  .kv-fan path,.kv-beam{stroke-width:2.4}
  .kv-flow path{stroke-width:4.5}
  .kv-edge-l{transform:translate(64px,0)}.kv-edge-r{transform:translate(-44px,0)}
  .hint{margin:8px 6% 0}
  .fig{margin:0 6%}
  .hero-copy{grid-template-columns:1fr;gap:20px;padding:70px 0 100px}
  .hero-copy .en{text-align:left}
  .intro{margin:0 6% 120px;padding:80px 4%}
  .intro .orbits{inset:-20px -14%}
  .intro .statement{font-size:18px}
  .sec-head,.about-body,.board{margin-left:6%;margin-right:6%}
  .about-body{grid-template-columns:1fr;gap:24px}
  .spec h3{font-size:16px}
  .board{grid-template-columns:1fr;gap:40px}
  .spec>a{display:grid;grid-template-columns:38% 1fr;gap:16px;align-items:start}
  .spec .cap{margin-top:0}
  .spec .cap .mono span:last-child{display:none}
  .spec .motive{font-size:12.5px}
  .spec .open{word-break:break-all;font-size:10px}
  .badge{width:84px;height:84px;right:14px;bottom:14px}
  footer{margin:0 6%;padding-bottom:120px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
  .reveal{opacity:1;transform:none}
}