/* ============================================================
   SUM EQUAL — shared styles for AREA pages (studio / pawdice / 5150 / syncre / about / library / ai-systems)
   The top page (index.html) keeps its own inline styles for now; tokens here mirror it exactly.
   Neon = edges / points / lines / glow only. Never fill.
   ============================================================ */
:root{
  --ink:#0F0F12; --ink-0:#06060A; --ink-1:#04040A; --ink-2:#16161C; --ink-3:#1A1A20;
  --steel-hi:#9A9AA2; --steel:#5A5A62; --steel-2:#48484E; --steel-3:#3A3A42; --steel-4:#28282E;
  --moon:#EAEAF2; --paper:#F5F5F0;
  --t1:#F5F5F0; --t2:#B8B8C0; --t3:#8A8A95; --t4:#85858E; --t5:#5A5A62; --t6:#2C2C32;   /* t4: 4.75:1 on ink-3 (WCAG AA for small labels); t5 = lines/decor only, not text */
  --n-green:#00FF94; --n-purple:#B833FF; --n-cyan:#00E5FF; --n-emerald:#34D399; --n-lime:#C6FF00;
  --n-pink:#FF1B6B; --n-blue:#4FC3F7; --n-sage:#8FBC8F; --shu:#C73B3E;
  --line:rgba(154,154,162,.14);
  --ease:cubic-bezier(.2,.8,.2,1);
  /* corridor background strength — tune here only */
  --bg-strength:.5; --bg-strength-dig:.8;
  /* per-area accent (overridden inline on each page) */
  --area:#B8B8C0; --area-edge:rgba(184,184,192,.5);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){ html{scroll-behavior:auto} }

body{
  margin:0; background:var(--ink); color:var(--t1);
  font-family:"Zen Kaku Gothic New","Space Grotesk",system-ui,sans-serif;
  font-weight:400; line-height:1.85; letter-spacing:.01em;
  overflow-x:hidden; -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
body::before{
  content:""; position:fixed; inset:0; z-index:-3; pointer-events:none;
  background:radial-gradient(80% 60% at 50% 38%, var(--ink-3) 0%, var(--ink) 55%, var(--ink-0) 100%);
}
body::after{
  content:""; position:fixed; inset:0; z-index:-1; pointer-events:none; opacity:.5;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
}
/* the data corridor — shared atmosphere. url() is relative to this CSS file. */
.bg-corridor{position:fixed;inset:0;z-index:-2;pointer-events:none;overflow:hidden}
.bg-corridor::before{
  content:""; position:absolute; inset:-2%;
  background:url("img/bg/corridor_1536.webp?v=2") center 62% / cover no-repeat;
  opacity:var(--bg-strength); transform:scale(1.02);
  transition:opacity 1.2s var(--ease), transform 1.8s var(--ease);
}
.bg-corridor::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(180deg, rgba(15,15,18,.86) 0%, rgba(15,15,18,.58) 28%, rgba(15,15,18,.22) 56%, rgba(15,15,18,.62) 100%);
}
body.underground .bg-corridor::before{opacity:var(--bg-strength-dig); transform:scale(1.05)}
body.underground .bg-corridor::after{opacity:.5}
@media (max-width:640px){
  .bg-corridor::before{background-image:url("img/bg/corridor_m_720.webp?v=2"); background-position:center 55%}
}

a{color:inherit;text-decoration:none}
img,svg{max-width:100%}
.wrap{width:min(1080px,90vw);margin-inline:auto}

.mono{font-family:"Space Mono","Space Grotesk",monospace}
.eyebrow{font-family:"Space Mono",monospace;font-size:.7rem;letter-spacing:.42em;text-transform:uppercase;color:var(--t4);display:flex;align-items:center;gap:.9rem}
.eyebrow .rel{color:var(--area);letter-spacing:.2em;text-transform:none}
.sym{font-family:"Space Mono",monospace;color:var(--moon)}
h1,h2,h3{font-weight:700;line-height:1.18;letter-spacing:.02em;margin:0}
.eq{display:flex;flex-direction:column;gap:5px;width:34px;flex:none}
.eq span{height:2px;background:linear-gradient(90deg,transparent,var(--steel-hi),transparent);opacity:.5}
/* optical centering for trailing 「。」 */
.tp{margin-inline-end:-.52em}
.stanza{display:block;margin-top:.9em}

/* ---------------- nav (same as top page; brand → ../) ---------------- */
header.nav{
  position:fixed;z-index:200;top:0;left:0;right:0;
  display:flex;align-items:center;justify-content:space-between;
  padding:1.1rem clamp(1rem,4vw,2.4rem);
  transition:background .5s var(--ease),backdrop-filter .5s var(--ease),padding .5s var(--ease),border-color .5s var(--ease);
  border-bottom:1px solid transparent;
}
header.nav.scrolled{
  background:rgba(15,15,18,.72);
  -webkit-backdrop-filter:blur(14px) saturate(130%);backdrop-filter:blur(14px) saturate(130%);
  border-bottom-color:var(--line);padding-top:.7rem;padding-bottom:.7rem;
}
.brand{display:flex;align-items:center;gap:.6rem;font-family:"Space Grotesk",sans-serif;font-weight:700;letter-spacing:.1em;font-size:1.05rem;color:var(--t1)}
/* 九曜マーク：1枚の透過マスクを CSS mask で着色（色はどこでも差し替え可） */
.brand .mk{display:inline-block;width:34px;height:34px;background:var(--moon);
  -webkit-mask:url("img/logo/kuyo_mask_256.png") center/contain no-repeat;mask:url("img/logo/kuyo_mask_256.png") center/contain no-repeat;
  transition:background .4s var(--ease)}
.brand:hover .mk{background:var(--area)}
.kuyo{display:inline-block;background:var(--moon);-webkit-mask:url("img/logo/kuyo_mask_512.png") center/contain no-repeat;mask:url("img/logo/kuyo_mask_512.png") center/contain no-repeat}
.nav-right{display:flex;align-items:center;gap:1.4rem}
.nav-links{display:flex;gap:1.5rem;align-items:center;font-family:"Space Mono",monospace;font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--t3)}
.nav-links a{position:relative;white-space:nowrap;transition:color .3s var(--ease)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-5px;width:0;height:1px;background:var(--moon);transition:width .35s var(--ease)}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--t1)}
.nav-links a:hover::after,.nav-links a[aria-current="page"]::after{width:100%}
.menu-btn{display:none;background:none;border:none;color:var(--t1);cursor:pointer;padding:.3rem}

/* ---------------- buttons ---------------- */
.btn{display:inline-flex;align-items:center;gap:.7rem;padding:1rem 2rem;font-family:"Space Mono",monospace;font-size:.82rem;letter-spacing:.12em;border:1px solid var(--steel);border-radius:2px;color:var(--t1);transition:border-color .4s var(--ease),color .4s var(--ease),background .4s var(--ease)}
.btn .s{color:var(--area)}
.btn:hover{border-color:var(--area)}
.btn:focus-visible{outline:2px solid var(--moon);outline-offset:3px}
.btn.soon{opacity:.55;cursor:default}
.btn.soon:hover{border-color:var(--steel)}
.btn .tag{font-size:.6rem;letter-spacing:.2em;color:var(--t4);margin-left:.4rem}

/* ---------------- area hero ---------------- */
.ahero{padding:8.5rem 0 3rem}
.ahero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,6vw,5rem);align-items:center}
/* h1 max 3.4rem: the hero column is ~525px at 1440, and the longest unbreakable run in the taglines is 9 chars (9 × 1.03em must fit) */
.ahero h1{font-size:clamp(2.2rem,4.4vw,3.4rem);font-weight:900;line-height:1.15;letter-spacing:.03em;margin:.7rem 0 1.4rem;word-break:keep-all;overflow-wrap:anywhere}
.ahero .lead{color:var(--t2);font-size:clamp(1rem,2vw,1.15rem);line-height:2;word-break:keep-all;overflow-wrap:anywhere;position:relative;z-index:0;padding:.4rem 0}
.ahero .lead::before{content:"";position:absolute;z-index:-1;top:-1rem;bottom:-1rem;left:-1.2rem;right:-1.2rem;border-radius:6px;background:rgba(15,15,18,.62)}
.ahero .lead b{color:var(--t1);font-weight:700}
.visual{position:relative}
.frame{position:relative;border-radius:10px;overflow:hidden;background:var(--ink-2);box-shadow:0 0 0 1px rgba(154,154,162,.18),0 0 0 3px var(--ink-1),0 30px 60px rgba(0,0,0,.55)}
.frame::after{content:"";position:absolute;inset:0;border-radius:10px;box-shadow:inset 0 0 0 1px var(--area-edge);pointer-events:none}
.frame img{display:block;width:100%;height:100%;object-fit:cover;filter:saturate(.9)}
.frame.wide{aspect-ratio:16/9} .frame.tall{aspect-ratio:4/5} .frame.square{aspect-ratio:1} .frame.strip{aspect-ratio:16/5}
/* poster tiles: show the whole artwork (text at top/bottom must not be cropped) */
.frame.poster{aspect-ratio:7/10;background:#0A0A0E}
.frame.poster img{object-fit:contain}
.frame.poster.cover img{object-fit:cover}
.frame .cap{position:absolute;left:1rem;bottom:.9rem;z-index:2;font-family:"Space Mono",monospace;font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;color:var(--t2);padding:.35rem .7rem;border-radius:2px;background:rgba(15,15,18,.62);border:1px solid rgba(154,154,162,.2)}
.frame .rel{position:absolute;right:1rem;top:.9rem;z-index:2;font-family:"Space Mono",monospace;font-size:.9rem;color:var(--area);text-shadow:0 0 10px var(--area-edge)}
.ph{display:grid;place-items:center;text-align:center;color:var(--t4);font-family:"Space Mono",monospace;font-size:.68rem;letter-spacing:.2em;line-height:1.8;padding:1rem;background:linear-gradient(160deg,rgba(58,58,68,.28),rgba(22,22,28,.65))}
.ph small{display:block;letter-spacing:.1em;color:var(--t3);font-size:.6rem}

/* ---------------- copy ---------------- */
section{position:relative}
.copy{padding:clamp(3rem,7vw,5.5rem) 0}
.copy .wrap{max-width:760px}
.copy p{font-size:clamp(1.02rem,2.1vw,1.2rem);line-height:2;color:var(--t2);margin:0;word-break:keep-all;overflow-wrap:anywhere}
/* paragraph rhythm lives on the reveal wrappers (each <p> sits in its own div) */
.copy .wrap > div{margin:0 0 1.7em}
.copy .wrap > div:last-child{margin-bottom:0}
.copy .wrap > p + p{margin-top:1.7em}
.copy p.strong{color:var(--t1);font-weight:500}
.copy h2.kicker{font-size:.72rem;font-weight:400;line-height:1.85;letter-spacing:.34em;margin:0 0 1.6rem}
.copy .s{font-family:"Space Mono",monospace;color:var(--area);margin-right:.35em}
.copy .kicker{font-family:"Space Mono",monospace;font-size:.72rem;letter-spacing:.34em;text-transform:uppercase;color:var(--t4);margin:0 0 1.6rem;display:flex;align-items:center;gap:.8rem}
.copy h2{font-size:clamp(1.3rem,3vw,1.9rem);font-weight:700;margin:0 0 1.4rem;word-break:keep-all}
/* document-style lists (services / underground) */
.doc{border-top:1px solid var(--line)}
.doc .grp{padding:1.6rem 0;border-bottom:1px solid var(--line)}
.doc .grp h3{font-family:"Space Mono",monospace;font-size:.78rem;letter-spacing:.24em;color:var(--area);font-weight:400;margin:0 0 .9rem}
.doc .row{display:grid;grid-template-columns:1fr auto;gap:1rem;padding:.4rem 0;font-size:1rem;color:var(--t1);align-items:baseline}
.doc .row .v{font-family:"Space Mono",monospace;color:var(--t2);font-size:.9rem;letter-spacing:.04em;white-space:nowrap}
.doc .note{font-size:.82rem;color:var(--t3);margin:.6rem 0 0}
.doc .grp p{margin:0;color:var(--t2);font-size:1rem}
.process{display:flex;flex-wrap:wrap;gap:.6rem 1rem;align-items:center;font-family:"Space Mono",monospace;font-size:.82rem;letter-spacing:.14em;color:var(--t1)}
.process .arr{color:var(--area)}
.linkline{margin-top:2rem}
.linkline a{color:var(--t2);border-bottom:1px solid var(--line);padding-bottom:.15rem;transition:color .3s var(--ease),border-color .3s var(--ease)}
.linkline a:hover{color:var(--t1);border-color:var(--area)}
.linkline .s{font-family:"Space Mono",monospace;color:var(--area);margin-left:.4em}

/* ---------------- gallery / series ---------------- */
.gallery{padding:clamp(2rem,5vw,4rem) 0}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.2rem}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem}
.series h3{font-family:"Space Mono",monospace;font-size:.8rem;letter-spacing:.2em;color:var(--area);margin:.9rem 0 .2rem;font-weight:400}
.series p{color:var(--t3);font-size:.9rem;margin:0}
.company{border-top:1px solid var(--line);margin-top:1rem}
.company .row{display:grid;grid-template-columns:8rem 1fr;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--line)}
.company .k{font-family:"Space Mono",monospace;font-size:.72rem;letter-spacing:.22em;color:var(--t4);padding-top:.25rem}
.company .v{color:var(--t1)}
.articles{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.articles li{display:grid;grid-template-columns:auto 1fr auto;gap:1.2rem;align-items:center;padding:1.1rem 0;border-bottom:1px solid var(--line)}
.articles .th{width:96px;aspect-ratio:4/3;border-radius:4px;overflow:hidden;background:var(--ink-2);flex:none}
.articles .th img{width:100%;height:100%;object-fit:cover;display:block}
.articles .t{color:var(--t1)}
.articles .sub{font-size:.8rem;color:var(--t3);display:block}
.articles .st{font-family:"Space Mono",monospace;font-size:.62rem;letter-spacing:.2em;color:var(--t4);text-transform:uppercase;white-space:nowrap}

/* ---------------- CTA + back ---------------- */
.acta{text-align:center;padding:clamp(4rem,9vw,7rem) 0 3rem}
.acta h2{font-size:clamp(1.4rem,3.8vw,2.3rem);font-weight:700;margin:0 0 2rem;word-break:keep-all;overflow-wrap:anywhere}
.acta .btns{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center}
.back{display:inline-flex;gap:.6rem;font-family:"Space Mono",monospace;font-size:.74rem;letter-spacing:.16em;color:var(--t3);margin-top:2.6rem;transition:color .3s var(--ease)}
.back:hover{color:var(--t1)}
.back .s{color:var(--area)}

/* ---------------- footer ---------------- */
footer{border-top:1px solid var(--line);padding:4rem 0 3rem;margin-top:2rem}
.foot{display:flex;justify-content:space-between;align-items:flex-end;flex-wrap:wrap;gap:2rem}
.foot .peace{font-family:"Space Mono",monospace;font-size:.8rem;letter-spacing:.3em;color:var(--t3)}
.foot .links{display:flex;gap:1.4rem;font-family:"Space Mono",monospace;font-size:.72rem;letter-spacing:.1em;color:var(--t3)}
.foot .links a:hover{color:var(--t1)}
.foot .cp{width:100%;font-family:"Space Mono",monospace;font-size:.66rem;color:var(--t3);letter-spacing:.08em}

/* ---------------- progress / reveal ---------------- */
.progress{position:fixed;top:0;left:0;height:2px;width:0;background:linear-gradient(90deg,var(--steel-hi),var(--moon));z-index:300;transition:width .1s linear}
/* reveal is JS-gated: without JS (or if init fails) everything stays visible */
html.js [data-reveal]{opacity:0;transform:translateY(24px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
html.js [data-reveal].in{opacity:1;transform:none}
html.js [data-reveal][data-d="1"]{transition-delay:.08s}
html.js [data-reveal][data-d="2"]{transition-delay:.16s}
html.js [data-reveal][data-d="3"]{transition-delay:.24s}

/* ---------------- responsive ---------------- */
@media (max-width:900px){
  .ahero{padding-top:6.5rem}
  .ahero .wrap{grid-template-columns:1fr}
  .visual{order:-1;max-width:560px;width:100%;margin-inline:auto}
  .grid3,.grid4{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  /* collapse only when JS runs (the button needs it). Without JS the links stay visible, wrapped. */
  .nav-links{flex-wrap:wrap;justify-content:flex-end;gap:.6rem .9rem;font-size:.66rem}
  html.js .nav-links{display:none}
  html.js .menu-btn{display:block}
  html.js .nav-links.open{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:1.2rem;padding:1.6rem;background:rgba(15,15,18,.97);border-bottom:1px solid var(--line)}
}
@media (max-width:600px){
  .grid3,.grid2,.grid4{grid-template-columns:1fr}
  .company .row{grid-template-columns:1fr;gap:.2rem}
  .doc .row{grid-template-columns:1fr;gap:.2rem}
  .doc .row .v{white-space:normal}
  .articles li{grid-template-columns:auto 1fr}
  .articles .st{grid-column:2}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important}
  [data-reveal]{opacity:1!important;transform:none!important;transition:none!important}
  .bg-corridor::before,.bg-corridor::after{transition:none}
}

/* ---------------- contact form ---------------- */
.form{display:grid;gap:1.4rem;max-width:640px}
.form label{display:grid;gap:.5rem;font-family:"Space Mono",monospace;font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--t3)}
.form label .req{color:var(--area);letter-spacing:.1em;text-transform:none;margin-left:.4em}
.form input,.form select,.form textarea{
  width:100%;font:inherit;font-family:"Zen Kaku Gothic New","Space Grotesk",system-ui,sans-serif;font-size:1rem;letter-spacing:.02em;
  color:var(--t1);background:rgba(15,15,18,.72);border:1px solid var(--steel-3);border-radius:2px;padding:.85rem 1rem;
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.form textarea{min-height:11rem;resize:vertical;line-height:1.8}
.form select{-webkit-appearance:none;appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--t3) 50%),linear-gradient(135deg,var(--t3) 50%,transparent 50%);background-position:calc(100% - 1.3rem) 50%,calc(100% - .9rem) 50%;background-size:.4rem .4rem;background-repeat:no-repeat;padding-right:2.6rem}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--moon);box-shadow:0 0 0 3px rgba(234,234,242,.12)}
.form input:user-invalid,.form textarea:user-invalid{border-color:var(--shu)}
.form .hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.form .actions{display:flex;align-items:center;gap:1.2rem;flex-wrap:wrap;margin-top:.4rem}
.form .note{font-size:.8rem;color:var(--t4);margin:0}
.notice{border:1px solid var(--area-edge);border-radius:4px;padding:1.2rem 1.4rem;color:var(--t1);background:rgba(15,15,18,.7);margin-bottom:2rem}
.notice.err{border-color:rgba(199,59,62,.6)}
.notice .s{font-family:"Space Mono",monospace;color:var(--area);margin-right:.4em}
.alt{font-size:.9rem;color:var(--t3);margin-top:2.4rem}
.alt a{color:var(--t2);border-bottom:1px solid var(--line)}

/* anchor targets clear the fixed header when jumped to (e.g. library/#a-5150) */
[id]{scroll-margin-top:6rem}