/* ============================================================
   Number Inc. — Shared design system
   Architectural / Editorial / Material
   ============================================================ */

:root{
  --paper:    #f3efe8;
  --paper-2:  #ebe6dc;
  --paper-3:  #dfd8c9;
  --ink:      #1a1816;
  --ink-2:    #3a3630;
  --ink-3:    #6b655c;
  --line:     rgba(26,24,22,0.14);
  --line-2:   rgba(26,24,22,0.08);
  --clay:     #8a3d1f;
  --clay-2:   #6e2f16;
  --moss:     #4a5338;

  --f-display: "Fraunces", "Shippori Mincho", serif;
  --f-sans:    "Archivo", "Noto Sans JP", sans-serif;
  --f-jp:      "Shippori Mincho", "Yu Mincho", serif;
  --f-mono:    "JetBrains Mono", ui-monospace, monospace;

  --gap: 24px;
  --pad: 48px;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--f-sans);
  font-size:14px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  font-feature-settings:"palt","ss01";
}
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
img{ display:block; max-width:100%; }

/* Grain */
body::before{
  content:""; position:fixed; inset:0;
  pointer-events:none; z-index:1000;
  opacity:.2; mix-blend-mode:multiply;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(50,35,20,.08) 1px, transparent 1.5px),
    radial-gradient(circle at 70% 80%, rgba(50,35,20,.06) 1px, transparent 1.5px);
  background-size: 8px 8px, 13px 13px;
}

/* ===== Typography helpers ===== */
.display{
  font-family:var(--f-display);
  font-weight:300;
  font-variation-settings:"SOFT" 40,"opsz" 144;
  letter-spacing:-0.02em;
  line-height:0.95;
}
.jp{ font-family:var(--f-jp); font-weight:500; letter-spacing:.04em; }
.mono{ font-family:var(--f-mono); letter-spacing:.04em; font-weight:400; }
.tick{
  font-family:var(--f-mono);
  font-size:10px; letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--ink-3);
}

/* Placeholder imagery — striped with label */
.ph{
  position:relative;
  background:
    repeating-linear-gradient(135deg,
      #c9c0ae 0 14px,
      #beb6a3 14px 28px);
  overflow:hidden;
  color:var(--ink-2);
}
.ph::after{
  content:attr(data-label);
  position:absolute; inset:12px;
  display:flex; align-items:flex-end;
  font-family:var(--f-mono); font-size:10px;
  letter-spacing:.22em; text-transform:uppercase;
  color:rgba(30,20,10,.65);
}
.ph.dark{
  background:
    repeating-linear-gradient(135deg,
      #2a2520 0 14px, #221e19 14px 28px);
  color:#ddd;
}
.ph.dark::after{ color:rgba(240,230,210,.7); }
.ph.clay{
  background:
    repeating-linear-gradient(135deg,
      var(--clay) 0 14px, var(--clay-2) 14px 28px);
}
.ph.clay::after{ color:rgba(255,240,220,.85); }

/* ===== Layout frame ===== */
.frame{
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:50;
}
.frame .edge{
  position:absolute;
  background:var(--ink);
  opacity:0;
}

/* ===== Global nav (top bar) ===== */
.topbar{
  position:fixed; top:0; left:0; right:0;
  z-index:100;
  display:grid;
  grid-template-columns: 220px 1fr auto;
  align-items:center;
  padding:20px var(--pad);
  background:transparent;
  transition: background .3s, backdrop-filter .3s, border-color .3s;
  border-bottom:1px solid transparent;
}
.topbar.scrolled{
  background:rgba(243,239,232,.88);
  backdrop-filter:blur(12px);
  border-bottom-color:var(--line);
}
.topbar.on-dark{ color:var(--paper); }
.topbar.on-dark.scrolled{ color:var(--ink); }

.logo{
  display:inline-flex; align-items:center; gap:14px;
  font-family:var(--f-display);
  font-size:22px;
  font-weight:400;
  letter-spacing:-.01em;
}
.logo .brand-img{
  height:56px; width:auto;
  display:block;
  object-fit:contain;
}
.logo .brand-text{
  display:inline-flex; flex-direction:column;
  line-height:1;
  padding-left:14px;
  border-left:1px solid currentColor;
  opacity:.85;
}
.logo .brand-text .en{
  font-family:var(--f-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
}
.logo .brand-text .jp{
  font-family:var(--f-jp);
  font-size:10px;
  margin-top:6px;
  letter-spacing:.18em;
  opacity:.7;
}
/* dark-bg nav uses light logo; when scrolled (light bg) swap to dark */
.topbar .brand-img.on-paper{ display:none; }
.topbar.scrolled .brand-img.on-ink{ display:none; }
.topbar.scrolled .brand-img.on-paper{ display:block; }
/* non-dark pages (company/works page-head pages) use dark logo by default */
.topbar:not(.on-dark) .brand-img.on-ink{ display:none; }
.topbar:not(.on-dark) .brand-img.on-paper{ display:block; }

.pages{
  display:flex; gap:36px;
  justify-content:center;
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  font-family:var(--f-mono);
}
.pages a{
  display:inline-flex; gap:8px;
  padding:6px 2px;
  position:relative;
  opacity:.72;
  transition:opacity .2s;
}
.pages a:hover, .pages a.active{ opacity:1; }
.pages a.active::before{
  content:"●";
  color:var(--clay);
  font-size:8px;
}
.pages a .num{ opacity:.5; }

.tel-pill{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--f-mono);
  font-size:11px;
  letter-spacing:.14em;
  padding:8px 14px;
  border:1px solid currentColor;
  border-radius:100px;
}
.tel-pill::before{
  content:"●";
  color:var(--clay);
  font-size:7px;
}

/* ===== Side index (fixed left rail) ===== */
.rail{
  position:fixed;
  left:20px; top:50%;
  transform:translateY(-50%);
  z-index:40;
  display:flex; flex-direction:column;
  gap:22px;
  pointer-events:none;
}
.rail a{
  pointer-events:auto;
  font-family:var(--f-mono);
  font-size:10px;
  letter-spacing:.2em;
  text-transform:uppercase;
  writing-mode:vertical-rl;
  color:var(--ink-3);
  padding:4px 2px;
  transition:color .2s;
}
.rail a:hover, .rail a.current{ color:var(--ink); }
.rail a.current::after{
  content:"";
  display:inline-block;
  width:1px; height:18px;
  background:currentColor;
  margin-top:8px;
}

/* ===== Buttons ===== */
.btn{
  display:inline-flex; align-items:center; gap:14px;
  padding:14px 22px;
  border:1px solid var(--ink);
  background:var(--ink);
  color:var(--paper);
  font-family:var(--f-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  cursor:pointer;
  transition:background .3s, color .3s, border-color .3s;
}
.btn:hover{ background:var(--clay); border-color:var(--clay); }
.btn.ghost{ background:transparent; color:inherit; }
.btn.ghost:hover{ background:var(--ink); color:var(--paper); border-color:var(--ink); }
.btn.ghost.light{ color:var(--paper); border-color:var(--paper); }
.btn.ghost.light:hover{ background:var(--paper); color:var(--ink); border-color:var(--paper); }
.btn .arr{ width:18px; height:1px; background:currentColor; position:relative; }
.btn .arr::after{
  content:""; position:absolute; right:0; top:-3px;
  width:7px; height:7px;
  border-top:1px solid currentColor;
  border-right:1px solid currentColor;
  transform:rotate(45deg);
}

/* ===== Page header (breadcrumb + huge title) ===== */
.page-head{
  padding: 160px var(--pad) 80px 140px;
  display:grid;
  grid-template-columns: 1fr 340px;
  gap:48px;
  align-items:end;
  border-bottom:1px solid var(--ink);
}
.page-head .no{
  font-family:var(--f-mono);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--ink-3);
  margin-bottom:24px;
  text-transform:uppercase;
  display:flex; align-items:center; gap:14px;
}
.page-head .no::before{
  content:""; width:40px; height:1px; background:var(--ink-3);
}
.page-head h1{
  font-family:var(--f-display);
  font-weight:300;
  font-variation-settings:"SOFT" 50,"opsz" 144;
  font-size:clamp(90px, 13vw, 190px);
  line-height:.9;
  letter-spacing:-0.03em;
}
.page-head h1 .jp{
  display:block;
  font-size:.18em;
  margin-top:24px;
  letter-spacing:.2em;
  color:var(--ink-2);
  font-weight:500;
}
.page-head .lede{
  font-family:var(--f-jp);
  font-size:15px;
  line-height:2;
  color:var(--ink-2);
  max-width:340px;
}

/* ===== Section primitives ===== */
.section{
  padding: 120px var(--pad) 120px 140px;
  position:relative;
}
.section.band{ background:var(--paper-2); }
.section.dark{ background:var(--ink); color:var(--paper); }
.section.clay{ background:var(--clay); color:var(--paper); }

.sh{
  display:grid;
  grid-template-columns: 200px 1fr;
  gap:48px;
  margin-bottom:72px;
  align-items:end;
}
.sh .kicker{
  font-family:var(--f-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--ink-3);
  line-height:1.4;
}
.sh .kicker .n{
  display:block;
  font-size:44px;
  font-family:var(--f-display);
  font-weight:300;
  letter-spacing:-.02em;
  color:var(--ink);
  margin-bottom:10px;
}
.section.dark .sh .kicker .n{ color:var(--paper); }
.section.dark .sh .kicker{ color:rgba(243,239,232,.6); }
.section.clay .sh .kicker{ color:rgba(255,240,220,.75); }
.section.clay .sh .kicker .n{ color:var(--paper); }

.sh h2{
  font-family:var(--f-display);
  font-weight:300;
  font-variation-settings:"SOFT" 50,"opsz" 144;
  font-size:clamp(52px, 6vw, 84px);
  letter-spacing:-.02em;
  line-height:1;
}
.sh h2 .jp{
  display:block;
  font-size:.26em;
  margin-top:12px;
  letter-spacing:.12em;
  color:var(--ink-2);
}
.section.dark .sh h2 .jp{ color:rgba(243,239,232,.75); }

/* ===== Footer (shared) ===== */
.footer{
  background:var(--ink);
  color:var(--paper);
  padding:80px var(--pad) 40px 140px;
  position:relative;
}
.footer .f-top{
  display:grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap:48px;
  padding-bottom:56px;
  border-bottom:1px solid rgba(243,239,232,.14);
}
.footer .f-brand .logo{ font-size:28px; margin-bottom:22px; }
.footer .f-brand p{
  font-family:var(--f-jp);
  font-size:13px; line-height:2;
  color:rgba(243,239,232,.65);
  max-width:320px;
}
.footer h5{
  font-family:var(--f-mono);
  font-size:10px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:rgba(243,239,232,.5);
  margin-bottom:20px;
}
.footer ul li{
  font-family:var(--f-jp);
  font-size:14px;
  padding:4px 0;
}
.footer ul a:hover{ color:var(--clay); }
.footer .f-bot{
  display:flex;
  justify-content:space-between;
  padding-top:26px;
  font-family:var(--f-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:rgba(243,239,232,.5);
  text-transform:uppercase;
}
.footer .f-bot .mega{
  position:absolute;
  right:var(--pad);
  bottom:80px;
  font-family:var(--f-display);
  font-weight:300;
  font-size:clamp(100px, 14vw, 200px);
  line-height:.85;
  letter-spacing:-.04em;
  color:rgba(243,239,232,.07);
  pointer-events:none;
}

/* ===== Utility ===== */
.hr{ border:0; height:1px; background:var(--line); margin:0; }
.hr-dark{ border:0; height:1px; background:var(--ink); margin:0; }

/* ===== Responsive ===== */
@media (max-width: 1100px){
  :root{ --pad: 32px; }
  .rail{ display:none; }
  .topbar{ grid-template-columns: auto 1fr auto; gap:24px; }
  .pages{ gap:20px; }
  .pages a .num{ display:none; }
  .page-head,
  .section,
  .footer{ padding-left: var(--pad); }
}
@media (max-width: 760px){
  :root{ --pad: 20px; }
  .topbar{ grid-template-columns: auto auto; padding:14px var(--pad); }
  .tel-pill{ display:none; }
  .pages{ display:none; }
  .page-head{ grid-template-columns:1fr; padding-top:120px; padding-bottom:56px; gap:32px; }
  .page-head h1{ font-size:72px; }
  .page-head .lede{ max-width:none; }
  .section{ padding:72px var(--pad); }
  .sh{ grid-template-columns:1fr; gap:20px; margin-bottom:48px; }
  .sh h2{ font-size:48px; }
  .footer{ padding:56px var(--pad) 32px; }
  .footer .f-top{ grid-template-columns:1fr 1fr; gap:32px; }
  .footer .f-bot{ flex-direction:column; gap:8px; }
  .footer .f-bot .mega{ display:none; }
}