/* ============================================================
   NullPo Works — base.css  (SHARED FOUNDATION, all pages)
   Tokens, fonts, substrate, header/nav, buttons, scaffold,
   reveal, footer. Page-specific styles live in their own files.
   Edit design tokens HERE so the whole site stays consistent.
   ============================================================ */

*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }

:root{
  /* neutral shell */
  --bg:        #07090a;
  --bg-2:      #0a0e0f;
  --panel:     #0e1314;
  --panel-2:   #131a1b;
  --ink:       #eef2ef;
  --ink-dim:   #9aa6a1;
  --ink-faint: #5d6863;

  /* single restrained brand accent (refined emerald) */
  --brand:     #34e2a0;
  --brand-dim: #1f8f68;

  /* hairlines */
  --line:      rgba(255,255,255,0.075);
  --line-2:    rgba(255,255,255,0.13);

  /* per-work accent (overridden inline) */
  --accent:    var(--brand);
  --accent-glow: rgba(52,226,160,0.35);

  --mono: 'Space Mono', ui-monospace, monospace;
  --disp: 'Bricolage Grotesque', 'Noto Sans JP', system-ui, sans-serif;
  --sans: 'Noto Sans JP', system-ui, sans-serif;

  --maxw: 1180px;
  --pad: 22px;
  --ease: cubic-bezier(0.16,1,0.3,1);
  --header-h: 64px;
}

html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }

body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--ink);
  line-height:1.85;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  letter-spacing:0.005em;
}

/* ---- Fixed background substrate (mesh + pixel grid + grain) ---- */
.substrate{ position:fixed; inset:0; z-index:-3; pointer-events:none; }
.substrate::before{   /* gradient mesh / depth */
  content:''; position:absolute; inset:0;
  background:
    radial-gradient(900px 620px at 82% -6%, rgba(52,226,160,0.10), transparent 58%),
    radial-gradient(760px 560px at 8% 8%, rgba(40,120,150,0.07), transparent 55%),
    radial-gradient(1000px 800px at 50% 116%, rgba(52,226,160,0.05), transparent 60%),
    linear-gradient(180deg,#080c0d 0%, #06090a 45%, #050707 100%);
}
.substrate::after{    /* faint pixel grid */
  content:''; position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(130% 100% at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image:radial-gradient(130% 100% at 50% 0%, #000 0%, transparent 75%);
}
.grain{
  position:fixed; inset:0; z-index:-2; pointer-events:none;
  opacity:0.05; mix-blend-mode:overlay;
  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='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img{ max-width:100%; height:auto; display:block; }
a{ color:var(--brand); text-decoration:none; transition:color .3s var(--ease); }

.wrap,.container{ max-width:var(--maxw); margin:0 auto; padding:0 var(--pad); }

/* ============================================================
   Type primitives
   ============================================================ */
.cat-no{
  font-family:var(--mono);
  font-size:0.66rem;
  letter-spacing:0.26em;
  text-transform:uppercase;
  color:var(--accent);
  display:inline-flex; align-items:center; gap:9px;
}
.cat-no::before{
  content:''; width:18px; height:1px;
  background:currentColor; opacity:.6;
}
.eyebrow{
  font-family:var(--mono);
  font-size:0.66rem; letter-spacing:0.3em; text-transform:uppercase;
  color:var(--ink-faint);
  display:inline-flex; align-items:center; gap:10px;
}
.eyebrow .pip{ display:inline-block; width:7px; height:7px; background:var(--brand); box-shadow:0 0 9px var(--brand); }

/* pixel brand glyph (the demoted pixel motif) */
.pixmark{ display:inline-grid; grid-template-columns:repeat(3,3px); grid-template-rows:repeat(3,3px); gap:1.5px; }
.pixmark i{ background:var(--brand); }
.pixmark i:nth-child(2),.pixmark i:nth-child(4),.pixmark i:nth-child(6),.pixmark i:nth-child(8){ opacity:.35; }
.pixmark i:nth-child(5){ background:var(--brand); box-shadow:0 0 6px var(--brand); }

/* corner registration ticks overlay */
.ticks{ position:absolute; inset:0; pointer-events:none; z-index:3; }
.ticks::before,.ticks::after{
  content:''; position:absolute; width:15px; height:15px;
  border-color:var(--accent); opacity:.55;
}
.ticks::before{ top:10px; left:10px; border-top:1.5px solid; border-left:1.5px solid; }
.ticks::after{ bottom:10px; right:10px; border-bottom:1.5px solid; border-right:1.5px solid; }

/* ============================================================
   Header
   ============================================================ */
.header{
  position:fixed; top:0; left:0; width:100%; height:var(--header-h);
  z-index:1000; display:flex; align-items:center;
  border-bottom:1px solid transparent;
  transition:background .4s var(--ease), border-color .4s var(--ease), height .4s var(--ease);
}
.header.is-scrolled{
  background:rgba(7,10,11,0.72);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.header-inner{
  max-width:var(--maxw); margin:0 auto; width:100%; padding:0 var(--pad);
  display:flex; align-items:center; justify-content:space-between; gap:18px;
}
.brand,.header-logo{ display:flex; align-items:center; gap:11px; }
.brand img,.header-logo img{ height:24px; width:auto; opacity:.95; }
.brand .pixmark{ transform:scale(1.1); }

.nav-list{ display:flex; gap:34px; list-style:none; }
.nav-link{
  font-family:var(--mono);
  position:relative; color:var(--ink-dim); font-size:0.72rem;
  letter-spacing:0.16em; text-transform:uppercase; transition:color .3s var(--ease);
}
.nav-link::after{
  content:''; position:absolute; left:0; bottom:-6px; width:0; height:1px;
  background:var(--brand); box-shadow:0 0 8px var(--brand); transition:width .4s var(--ease);
}
.nav-link:hover{ color:var(--ink); }
.nav-link:hover::after{ width:100%; }

.header-right{ display:flex; align-items:center; gap:12px; }
.lang-toggle{
  font-family:var(--mono);
  background:transparent; border:1px solid var(--line-2); color:var(--ink-dim);
  font-size:0.66rem; letter-spacing:0.1em; padding:6px 12px; border-radius:2px;
  cursor:pointer; transition:all .3s var(--ease);
}
.lang-toggle:hover{ border-color:var(--brand-dim); color:var(--brand); background:rgba(52,226,160,0.08); }

.hamburger{ display:flex; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:8px; z-index:1100; }
.hamburger-line{ display:block; width:22px; height:1.5px; background:var(--ink); transition:transform .35s var(--ease), opacity .35s var(--ease); }
.hamburger.is-active .hamburger-line:nth-child(1){ transform:translateY(6.5px) rotate(45deg); }
.hamburger.is-active .hamburger-line:nth-child(2){ opacity:0; }
.hamburger.is-active .hamburger-line:nth-child(3){ transform:translateY(-6.5px) rotate(-45deg); }

.nav{
  position:fixed; top:0; right:0; width:78%; max-width:320px; height:100dvh;
  background:rgba(8,12,13,0.97); backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border-left:1px solid var(--line-2);
  transform:translateX(100%); transition:transform .45s var(--ease);
  z-index:1050; padding:calc(var(--header-h) + 30px) 32px 32px;
}
.nav.is-open{ transform:translateX(0); }
.nav .nav-list{ flex-direction:column; gap:26px; }
.nav .nav-link{ font-size:0.95rem; }

/* ============================================================
   Buttons
   ============================================================ */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:9px;
  font-family:var(--mono); font-size:0.74rem; letter-spacing:0.08em; text-transform:uppercase;
  padding:13px 22px; border-radius:3px; cursor:pointer; border:1px solid transparent;
  transition:transform .35s var(--ease), background .35s var(--ease), color .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
  white-space:nowrap;
}
.btn svg,.btn .btn-icon{ width:15px; height:15px; flex-shrink:0; }
/* primary: gradient with accent edge */
.btn-primary{
  color:#04130d;
  background:linear-gradient(180deg, var(--brand) 0%, var(--brand-dim) 100%);
  box-shadow:0 6px 22px rgba(52,226,160,0.22), inset 0 1px 0 rgba(255,255,255,0.25);
}
.btn-primary:hover{ transform:translateY(-2px); color:#04130d; box-shadow:0 12px 34px rgba(52,226,160,0.4), inset 0 1px 0 rgba(255,255,255,0.3); }
.btn-primary:disabled{ opacity:.55; transform:none; cursor:default; }
/* accent variant uses per-work color */
.btn-accent{
  color:#08110d;
  background:linear-gradient(180deg, var(--accent), color-mix(in srgb, var(--accent) 70%, #000));
  box-shadow:0 6px 22px var(--accent-glow), inset 0 1px 0 rgba(255,255,255,0.25);
}
.btn-accent:hover{ transform:translateY(-2px); color:#08110d; box-shadow:0 12px 34px var(--accent-glow), inset 0 1px 0 rgba(255,255,255,0.3); }
/* outline / glass — also covers legacy .btn-store */
.btn-ghost,.btn-store{
  color:var(--ink); border-color:var(--line-2);
  background:rgba(255,255,255,0.03); backdrop-filter:blur(6px);
}
.btn-ghost:hover,.btn-store:hover{ color:var(--accent); border-color:var(--accent); background:rgba(255,255,255,0.06); transform:translateY(-2px); }
.btn-disabled{ opacity:.4; pointer-events:none; color:var(--ink-dim); border:1px solid var(--line); background:transparent; }
.btn-soon{
  font-family:var(--mono); font-size:0.7rem; letter-spacing:0.14em; text-transform:uppercase;
  color:var(--ink-faint); border:1px dashed var(--line-2); padding:13px 22px; border-radius:3px;
  display:inline-flex; align-items:center; pointer-events:none;
}

/* ============================================================
   Section scaffold
   ============================================================ */
.section{ position:relative; padding:96px 0; }
.section-head{ margin-bottom:48px; }
.section-head .eyebrow{ margin-bottom:18px; }
.section-title{
  font-family:var(--disp); font-weight:800;
  font-size:clamp(2rem, 9vw, 3.4rem); letter-spacing:-0.02em; line-height:1.05;
  color:var(--ink);
}
.section-title .num{ font-family:var(--mono); font-size:0.8rem; font-weight:400; color:var(--ink-faint); letter-spacing:0.12em; margin-left:14px; vertical-align:middle; }
.section-lead{ margin-top:16px; color:var(--ink-dim); font-size:0.95rem; max-width:46ch; line-height:1.8; }

/* ============================================================
   Footer
   ============================================================ */
.footer{ padding:60px 0 50px; border-top:1px solid var(--line); text-align:center; }
.footer .container,.footer .wrap{ text-align:center; }
.footer-brand{ display:inline-flex; align-items:center; gap:11px; margin-bottom:24px; opacity:.85; }
.footer-brand img{ height:22px; width:auto; object-fit:contain; }
.footer-links{ display:flex; justify-content:center; flex-wrap:wrap; gap:14px 28px; margin-bottom:22px; }
.footer-link{ font-family:var(--mono); color:var(--ink-dim); font-size:0.72rem; letter-spacing:0.1em; text-transform:uppercase; }
.footer-link:hover{ color:var(--brand); }
.footer-copy{ font-family:var(--mono); color:var(--ink-faint); font-size:0.68rem; letter-spacing:0.08em; }

/* ============================================================
   Reveal
   ============================================================ */
.reveal{ opacity:0; transform:translateY(28px); transition:opacity .9s var(--ease), transform .9s var(--ease); will-change:opacity,transform; }
.reveal.is-visible{ opacity:1; transform:none; }
.rd-1{ transition-delay:.08s; } .rd-2{ transition-delay:.16s; } .rd-3{ transition-delay:.24s; }

@media (prefers-reduced-motion:reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
  *{ scroll-behavior:auto !important; }
}

/* ============================================================
   Shared responsive (header / nav / scaffold)
   ============================================================ */
@media (min-width:600px){
  :root{ --pad:34px; }
  .section{ padding:120px 0; }
}

@media (min-width:900px){
  :root{ --header-h:72px; --pad:40px; }
  body{ line-height:1.9; }

  .hamburger{ display:none; }
  .nav{ position:static; width:auto; max-width:none; height:auto; background:none; backdrop-filter:none; -webkit-backdrop-filter:none; border:none; transform:none; padding:0; }
  .nav .nav-list{ flex-direction:row; gap:34px; }
  .nav .nav-link{ font-size:0.72rem; }

  .section-head{ display:flex; align-items:flex-end; justify-content:space-between; gap:30px; margin-bottom:60px; }
  .section-head .section-lead{ margin:0; padding-bottom:6px; }
}