/* ────────────────────────────────────────────
   B·Ho · Liquid Cursor (gooey follower)
   複数追従ブロブを SVG goo フィルタで融合
   Pure CSS + JS、外部依存ゼロ
   ──────────────────────────────────────────── */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:where(html,body){line-break:strict;word-break:normal;overflow-wrap:break-word}
:where(h1,h2,h3,h4){text-wrap:balance}
:where(p,li){text-wrap:pretty}

:root{
  --bg:#f4f3ee;
  --ink:#0a0a0a;
  --muted:#6a6a6a;
  --line:#d8d6cc;
  --paper:#fff;
  --hi:#ff2d55;
  --alt:#0066ff;
  --font:'DM Sans','Noto Sans JP',sans-serif;
  --mono:'JetBrains Mono',monospace;

  /* ── Component variables ── */
  --lc-color:#ff2d55;
  --lc-blend:normal;     /* difference にすると反転カーソル風 */
}

html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--font);font-weight:400;line-height:1.65;min-height:100vh;
}
a{color:inherit;text-decoration:none}

/* ─── HEADER ─── */
header.site{
  position:sticky;top:0;z-index:50;background:var(--bg);
  padding:1rem clamp(1.2rem,4vw,3rem);
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  border-bottom:1px solid var(--ink);
}
.back{font-family:var(--mono);font-size:.78rem;letter-spacing:.18em;display:inline-flex;align-items:center;gap:.6em}
.back .arrow{transition:transform .25s}
.back:hover .arrow{transform:translateX(-.3em)}
.cell-marker{font-family:var(--mono);font-size:.78rem;letter-spacing:.22em;color:var(--hi)}

/* ────────────────────────────────────────────
   COMPONENT: .liquid-cursor
   ──────────────────────────────────────────── */
.liquid-cursor{
  position:fixed;inset:0;z-index:9999;
  pointer-events:none;
  opacity:0;transition:opacity .3s;
}
.liquid-cursor.is-active{opacity:1}
.lc-svg{width:100%;height:100%;display:block}      /* viewBox 無し → user unit = px */
.lc-blob{fill:var(--lc-color);mix-blend-mode:var(--lc-blend)}
/* 起動時はネイティブカーソルを隠す */
body.lc-hide-native, body.lc-hide-native *{cursor:none}
/* END COMPONENT */


/* ─── HERO ─── */
.hero{max-width:1000px;margin:0 auto;padding:clamp(4rem,10vw,8rem) clamp(1.5rem,4vw,3rem) clamp(2.5rem,5vw,4rem)}
.kicker{display:inline-block;font-family:var(--mono);font-size:.78rem;letter-spacing:.25em;padding:.3em .9em;border:1px solid var(--ink);margin-bottom:1.5rem}
.hero h1{font-weight:700;font-size:clamp(2.4rem,8vw,5.4rem);line-height:1.02;letter-spacing:-.02em}
.lead{font-size:clamp(1rem,1.3vw,1.1rem);color:var(--muted);max-width:38em;margin-top:1.5rem}
.targets{display:flex;flex-wrap:wrap;gap:1rem;margin-top:2.4rem}
.target{
  font-family:var(--mono);font-size:1rem;letter-spacing:.1em;font-weight:500;
  padding:.9em 1.6em;border:1px solid var(--ink);background:var(--paper);color:var(--ink);
}
.target--btn{background:var(--ink);color:#fff;cursor:pointer}

/* ─── pad / chips ─── */
section{max-width:1000px;margin:0 auto;padding:clamp(3rem,5vw,4.5rem) clamp(1.5rem,4vw,3rem)}
.shou{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding-bottom:1rem;border-bottom:1px solid var(--ink);margin-bottom:2.5rem}
.shou h2{font-size:clamp(1.3rem,2vw,1.7rem);font-weight:700;letter-spacing:.04em}
.shou .no{font-family:var(--mono);font-size:.78rem;letter-spacing:.25em;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:1rem}
.chip{
  font-family:var(--mono);font-size:1.1rem;letter-spacing:.06em;
  padding:.6em 1.2em;border:1px dashed var(--ink);background:var(--paper);
}

/* ─── NOTES ─── */
.notes-grid{display:grid;grid-template-columns:1fr;gap:1.2rem;margin-bottom:3rem}
@media(min-width:780px){.notes-grid{grid-template-columns:repeat(3,1fr)}}
.note{position:relative;background:var(--paper);border:1px solid var(--ink);padding:1.5rem 1.4rem 1.4rem}
.note-no{position:absolute;top:1rem;right:1rem;font-family:var(--mono);font-size:.7rem;letter-spacing:.2em;color:var(--muted)}
.note h3{font-size:1.02rem;font-weight:700;margin-bottom:.7rem;letter-spacing:.02em}
.note p{font-size:.86rem;color:var(--muted);line-height:1.8}
.note code,.var span code{font-family:var(--mono);font-size:.85em;background:var(--bg);padding:.1em .35em;border:1px solid var(--line)}
.sub-h{font-size:1rem;font-weight:700;letter-spacing:.04em;margin:2rem 0 1rem;padding-bottom:.7rem;border-bottom:1px dashed var(--ink)}
.vars{display:grid;grid-template-columns:1fr;gap:0;border:1px solid var(--ink);background:var(--paper)}
.var{display:grid;grid-template-columns:minmax(7rem,auto) 1fr auto;gap:1rem;padding:.8rem 1rem;border-bottom:1px solid var(--line);align-items:center}
.var:last-child{border-bottom:none}
.var code{font-family:var(--mono);font-size:.82rem;color:var(--hi);font-weight:500}
.var span{font-size:.85rem;color:var(--muted);line-height:1.5}
.var em{font-family:var(--mono);font-size:.78rem;font-style:normal;color:var(--ink);background:var(--bg);padding:.15em .55em;border:1px solid var(--line);white-space:nowrap}
@media(max-width:680px){.var{grid-template-columns:1fr;gap:.3rem;padding:.9rem 1rem}.var em{justify-self:start}}

/* ─── FOOTER ─── */
footer{
  padding:2rem clamp(1.2rem,4vw,3rem) 1.5rem;
  display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;color:var(--muted);
  border-top:1px solid var(--ink);
}
footer a{color:var(--ink)}

/* Reduced motion: 液体カーソルを起動しない（JS 側でも判定） */
@media (prefers-reduced-motion: reduce){
  .liquid-cursor{display:none}
}