/* ============================================================
   ZERO ORIGIN — Shared stylesheet
   Loaded by: index.html, privacy.html, terms.html
   Page-specific selectors are gated by body classes:
     - .page-home  → index.html
     - .page-doc   → privacy.html / terms.html
   ============================================================ */

/* ─── Design tokens ─── */
:root{
  /* Dark theme — default */
  --bg:#050505;
  --bg-2:#080808;
  --ink:#ece6da;
  --ink-soft:rgba(236,230,218,0.62);
  --ink-dim:rgba(236,230,218,0.4);
  --ink-faint:rgba(236,230,218,0.22);
  --rule:rgba(236,230,218,0.12);
  --rule-soft:rgba(236,230,218,0.06);
  --accent:#c8a878;
  --indigo:#a5b4fc;
}

:root[data-theme="light"]{
  /* Light theme — warm paper */
  --bg:#f3eddf;
  --bg-2:#eae3d1;
  --ink:#1a1612;
  --ink-soft:rgba(26,22,18,0.66);
  --ink-dim:rgba(26,22,18,0.48);
  --ink-faint:rgba(26,22,18,0.3);
  --rule:rgba(26,22,18,0.16);
  --rule-soft:rgba(26,22,18,0.08);
  --accent:#8c6a36;
  --indigo:#4b56b3;
}

/* ─── Reset & base ─── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:'Manrope',sans-serif;font-weight:300;line-height:1.5;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background-color .35s ease,color .35s ease;
}
::selection{background:var(--accent);color:var(--bg)}
a{color:inherit}

/* ─── Atmosphere (canvas + overlays) ─── */
canvas#bg{
  position:fixed;inset:0;width:100vw;height:100vh;
  z-index:0;pointer-events:none;
}
.scanlines,.grain,.vignette{position:fixed;inset:0;pointer-events:none}
.scanlines{
  z-index:5;
  background:repeating-linear-gradient(
    0deg,
    rgba(0,0,0,0.04) 0px,
    rgba(0,0,0,0.04) 1px,
    transparent 1px,
    transparent 3px
  );
}
.grain{
  z-index:6;opacity:.06;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='240' height='240' filter='url(%23n)'/></svg>");
}
.vignette{z-index:4;background:radial-gradient(ellipse at center,transparent 40%,rgba(0,0,0,0.55) 100%)}
[data-theme="light"] .grain{opacity:.05;mix-blend-mode:multiply}
[data-theme="light"] .vignette{background:radial-gradient(ellipse at center,transparent 55%,rgba(40,30,15,0.14) 100%)}
[data-theme="light"] .page-doc .nav{background:linear-gradient(180deg,var(--bg),rgba(243,237,223,0.6) 70%,transparent)}

/* ─── Crosshair decoration ─── */
.crosshair{position:fixed;width:14px;height:14px;color:var(--ink-faint);pointer-events:none;z-index:7}
.crosshair::before,.crosshair::after{content:'';position:absolute;background:currentColor}
.crosshair::before{left:50%;top:0;bottom:0;width:1px;transform:translateX(-0.5px)}
.crosshair::after{top:50%;left:0;right:0;height:1px;transform:translateY(-0.5px)}
.crosshair--tl{top:24px;left:24px}
.crosshair--tr{top:24px;right:24px}
.crosshair--bl{bottom:24px;left:24px}
.crosshair--br{bottom:24px;right:24px}

/* ─── Nav ─── */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:30;
  padding:22px 40px;display:flex;justify-content:space-between;align-items:center;
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.18em;text-transform:uppercase;color:var(--ink-soft);
}
.page-doc .nav{
  background:linear-gradient(180deg,var(--bg),rgba(5,5,5,0.6) 70%,transparent);
}
.nav__mark{color:var(--ink);font-weight:400;letter-spacing:0.3em;text-decoration:none}
.nav__links{display:flex;gap:36px}
.nav__links a{color:var(--ink-soft);text-decoration:none;transition:color .4s ease;position:relative}
.nav__links a::after{
  content:'';position:absolute;left:0;bottom:-5px;width:100%;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform .5s cubic-bezier(.2,.7,.2,1);
}
.nav__links a:hover{color:var(--ink)}
.nav__links a:hover::after{transform:scaleX(1)}
.nav__meta{display:flex;align-items:center;gap:12px}
.nav__dot{
  width:6px;height:6px;border-radius:50%;background:var(--accent);
  animation:dot 2s infinite ease-in-out;
}
@keyframes dot{0%,100%{opacity:1}50%{opacity:.25}}

/* Nav back arrow (doc pages) */
.nav__back{display:flex;align-items:center;gap:8px;color:var(--ink-soft);text-decoration:none;transition:color .3s ease}
.nav__back:hover{color:var(--ink)}
.nav__back-arrow{display:inline-block;width:18px;height:1px;background:currentColor;position:relative}
.nav__back-arrow::before{
  content:'';position:absolute;left:0;top:50%;width:6px;height:1px;background:currentColor;
  transform:translateY(-50%) rotate(-30deg);transform-origin:left;
}
.nav__back-arrow::after{
  content:'';position:absolute;left:0;top:50%;width:6px;height:1px;background:currentColor;
  transform:translateY(-50%) rotate(30deg);transform-origin:left;
}

/* ─── Theme toggle ─── */
.theme-toggle{
  appearance:none;-webkit-appearance:none;background:none;
  border:1px solid var(--rule);border-radius:50%;
  width:26px;height:26px;padding:0;
  display:inline-flex;align-items:center;justify-content:center;
  color:var(--ink-soft);cursor:pointer;
  transition:border-color .3s ease,color .3s ease,background-color .3s ease;
}
.theme-toggle:hover{border-color:var(--accent);color:var(--ink)}
.theme-toggle:focus-visible{outline:1px solid var(--accent);outline-offset:2px}
.theme-toggle svg{
  display:block;
  transition:transform .55s cubic-bezier(.2,.7,.2,1);
}
[data-theme="light"] .theme-toggle svg{transform:rotate(180deg)}

/* ─── Reveal animation ─── */
.reveal{
  opacity:0;transform:translateY(24px);
  transition:opacity 1.2s cubic-bezier(.2,.7,.2,1),transform 1.2s cubic-bezier(.2,.7,.2,1);
}
.reveal.in{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.08s}
.reveal[data-delay="2"]{transition-delay:.16s}
.reveal[data-delay="3"]{transition-delay:.24s}
.reveal[data-delay="4"]{transition-delay:.32s}
.reveal[data-delay="5"]{transition-delay:.4s}
.reveal[data-delay="6"]{transition-delay:.48s}
.reveal[data-delay="7"]{transition-delay:.56s}

/* ─── Footer (shared) ─── */
.footer{
  position:relative;z-index:10;background:var(--bg);
  border-top:1px solid var(--rule);padding:64px 64px 32px;
}
.footer__top{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;
  margin-bottom:64px;align-items:start;
  max-width:1280px;margin-left:auto;margin-right:auto;
}
.footer__mark{
  font-family:'Instrument Serif',serif;font-weight:400;font-style:italic;
  font-size:2.5rem;line-height:.95;color:var(--ink);letter-spacing:-0.01em;
  text-decoration:none;
}
.footer__mark span{font-style:normal;font-weight:400}
.footer__col h4{
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.28em;color:var(--ink-faint);text-transform:uppercase;
  margin-bottom:18px;font-weight:400;
}
.footer__col a,.footer__col p{
  display:block;font-family:'Manrope',sans-serif;font-size:13px;
  color:var(--ink-soft);text-decoration:none;line-height:1.9;
  transition:color .3s ease;
}
.footer__col a:hover{color:var(--ink)}
.footer__bottom{
  max-width:1280px;margin:0 auto;
  padding-top:32px;border-top:1px solid var(--rule);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.2em;text-transform:uppercase;color:var(--ink-faint);
}

/* ============================================================
   HOME PAGE (index.html)
   ============================================================ */

/* Hero */
.hero{
  position:relative;min-height:100vh;z-index:10;
  display:flex;flex-direction:column;justify-content:space-between;
  padding:100px 64px 48px;
}
.hero__top,.hero__bottom{
  display:flex;justify-content:space-between;
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.22em;color:var(--ink-faint);text-transform:uppercase;
}
.hero__main{display:flex;flex-direction:column;gap:32px;max-width:1400px}
.hero__eyebrow{
  font-family:'JetBrains Mono',monospace;font-size:11px;
  letter-spacing:0.3em;color:var(--accent);text-transform:uppercase;
  display:flex;align-items:center;gap:14px;
}
.hero__eyebrow::before{content:'';width:36px;height:1px;background:var(--accent)}
.hero__title{
  font-family:'Instrument Serif',serif;font-weight:400;
  font-size:clamp(4.5rem,15vw,13rem);
  line-height:.92;letter-spacing:-0.02em;color:var(--ink);
}
.hero__title em{font-style:italic}
.hero__sub{
  font-family:'Instrument Serif',serif;font-style:italic;font-weight:400;
  font-size:clamp(1.25rem,2vw,1.75rem);line-height:1.4;
  color:var(--ink-soft);max-width:36ch;margin-top:4px;
}
.hero__sub-jp{
  font-family:'Manrope',sans-serif;font-style:normal;font-weight:300;
  font-size:.92rem;color:var(--ink-dim);letter-spacing:0.05em;
  margin-top:14px;display:block;line-height:1.7;
}
.scroll-cue{display:flex;align-items:center;gap:12px}
.scroll-cue__line{
  width:24px;height:1px;background:currentColor;
  animation:cue 2.4s infinite ease-in-out;transform-origin:left;
}
@keyframes cue{0%,100%{opacity:.3;transform:scaleX(.4)}50%{opacity:1;transform:scaleX(1)}}

/* Sections */
.section{position:relative;z-index:10;background:var(--bg);padding:160px 64px}
.section--alt{background:linear-gradient(180deg,var(--bg),var(--bg-2) 50%,var(--bg))}
.section__inner{max-width:1280px;margin:0 auto;position:relative}
.section__head{
  display:flex;justify-content:space-between;align-items:baseline;
  padding-bottom:32px;margin-bottom:96px;border-bottom:1px solid var(--rule);
  flex-wrap:wrap;gap:16px;
}
.section__num{
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.32em;color:var(--accent);text-transform:uppercase;
}
.section__tag{
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.22em;color:var(--ink-faint);text-transform:uppercase;
}

/* About */
.about__headline{
  font-family:'Instrument Serif',serif;font-weight:400;
  font-size:clamp(2.5rem,6.5vw,6rem);line-height:1.04;
  letter-spacing:-0.02em;margin-bottom:96px;max-width:18ch;
}
.about__headline em{font-style:italic;color:var(--accent)}
.about__grid{display:grid;grid-template-columns:1.8fr 1fr;gap:96px;align-items:start}
.about__copy{
  font-family:'Manrope',sans-serif;font-size:17px;font-weight:300;
  line-height:1.78;color:var(--ink);max-width:56ch;
}
.about__copy p+p{margin-top:1.4em}
.about__copy em{
  font-family:'Instrument Serif',serif;font-style:italic;color:var(--accent);
  font-size:1.08em;font-weight:400;
}
.principles{
  font-family:'JetBrains Mono',monospace;font-size:11px;
  color:var(--ink-soft);text-transform:uppercase;letter-spacing:0.18em;
}
.principles dt{
  color:var(--ink-faint);margin-top:28px;margin-bottom:6px;
  font-size:9px;letter-spacing:0.32em;
}
.principles dt:first-child{margin-top:0}
.principles dd{
  color:var(--ink);font-family:'Instrument Serif',serif;font-style:italic;
  font-size:21px;letter-spacing:0;text-transform:none;font-weight:400;
}

/* Services */
.services__list{border-top:1px solid var(--rule)}
.service{
  display:grid;grid-template-columns:100px 1fr 1.4fr 110px;gap:48px;
  align-items:baseline;padding:56px 0;border-bottom:1px solid var(--rule);
  position:relative;transition:padding .5s cubic-bezier(.2,.7,.2,1);
}
.service::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(90deg,transparent,var(--rule-soft) 40%,transparent);
  opacity:0;transition:opacity .5s ease;pointer-events:none;
}
.service:hover::before{opacity:1}
.service:hover{padding-left:16px}
.service__num{
  font-family:'JetBrains Mono',monospace;font-size:11px;
  color:var(--accent);letter-spacing:0.22em;
}
.service__title{
  font-family:'Instrument Serif',serif;font-weight:400;
  font-size:clamp(1.75rem,3vw,2.5rem);line-height:1.1;
  letter-spacing:-0.015em;color:var(--ink);
}
.service__title em{font-style:italic;color:var(--accent)}
.service__desc{
  font-family:'Manrope',sans-serif;font-size:14.5px;font-weight:300;
  line-height:1.72;color:var(--ink-soft);max-width:48ch;
}
.service__meta{
  font-family:'JetBrains Mono',monospace;font-size:10px;
  color:var(--ink-faint);letter-spacing:0.22em;text-transform:uppercase;
  text-align:right;line-height:1.7;
}

/* Company */
.company__intro{
  font-family:'Instrument Serif',serif;font-style:italic;font-weight:400;
  font-size:clamp(1.45rem,2.4vw,2.1rem);line-height:1.45;
  color:var(--ink-soft);max-width:38ch;margin-bottom:80px;
}
.company__intro em{font-style:normal;color:var(--accent);font-weight:400}
.info__grid{border-top:1px solid var(--rule)}
.info__row{
  display:grid;grid-template-columns:220px 1fr 60px;gap:64px;
  align-items:baseline;padding:36px 0;border-bottom:1px solid var(--rule);
  position:relative;
}
.info__label{
  font-family:'JetBrains Mono',monospace;font-size:11px;
  color:var(--ink-faint);letter-spacing:0.22em;text-transform:uppercase;
}
.info__value{
  font-family:'Instrument Serif',serif;font-weight:400;
  font-size:clamp(1.2rem,1.55vw,1.55rem);line-height:1.4;color:var(--ink);
}
.info__value em{font-style:italic;color:var(--accent)}
.info__value--mono{
  font-family:'JetBrains Mono',monospace;font-size:.95rem;
  font-weight:400;letter-spacing:0.04em;
}
.info__value-note{
  color:var(--ink-dim);font-size:.7em;margin-left:10px;
  font-style:normal;letter-spacing:0.06em;font-family:'JetBrains Mono',monospace;
}
.info__value a{
  color:inherit;text-decoration:none;
  border-bottom:1px solid var(--rule);
  transition:border-color .3s ease;
}
.info__value a:hover{border-color:var(--accent)}
.info__index{
  font-family:'JetBrains Mono',monospace;font-size:10px;
  color:var(--ink-faint);letter-spacing:0.22em;text-align:right;
}

.company__seal{
  margin-top:96px;display:flex;justify-content:flex-end;align-items:center;gap:18px;
  font-family:'JetBrains Mono',monospace;font-size:10px;
  color:var(--ink-dim);letter-spacing:0.28em;text-transform:uppercase;
}
.company__seal-mark{
  width:54px;height:54px;border:1px solid var(--accent);border-radius:50%;
  display:flex;align-items:center;justify-content:center;color:var(--accent);
  font-family:'Instrument Serif',serif;font-style:italic;font-size:20px;font-weight:400;
}

/* ============================================================
   DOCUMENT PAGES (privacy.html / terms.html)
   ============================================================ */

.doc{position:relative;z-index:10;padding:140px 64px 0;max-width:1280px;margin:0 auto}
.doc__hero{padding-bottom:80px;border-bottom:1px solid var(--rule);margin-bottom:96px}
.doc__label{
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.32em;color:var(--accent);text-transform:uppercase;
  display:flex;align-items:center;gap:14px;margin-bottom:32px;
}
.doc__label::before{content:'';width:36px;height:1px;background:var(--accent)}
.doc__title{
  font-family:'Instrument Serif',serif;font-weight:400;
  font-size:clamp(3rem,8vw,7rem);line-height:1;letter-spacing:-0.02em;
  color:var(--ink);margin-bottom:16px;
}
.doc__title em{font-style:italic}
.doc__subtitle{
  font-family:'Instrument Serif',serif;font-style:italic;font-weight:400;
  font-size:clamp(1.1rem,1.6vw,1.4rem);color:var(--ink-soft);
  margin-bottom:48px;
}
.doc__meta{
  display:flex;gap:48px;flex-wrap:wrap;
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.22em;text-transform:uppercase;color:var(--ink-faint);
}
.doc__meta strong{color:var(--ink-soft);font-weight:400;margin-left:10px}

.doc__body{padding-bottom:160px}

.doc__section{
  display:grid;grid-template-columns:240px 1fr;gap:64px;
  padding:48px 0;border-bottom:1px solid var(--rule);
}
.doc__section:last-child{border-bottom:none}
.doc__section-head{position:sticky;top:120px;align-self:start}
.doc__section-num{
  font-family:'JetBrains Mono',monospace;font-size:10px;
  letter-spacing:0.3em;color:var(--accent);text-transform:uppercase;
  margin-bottom:14px;
}
.doc__section-title{
  font-family:'Instrument Serif',serif;font-weight:400;
  font-size:1.6rem;line-height:1.15;letter-spacing:-0.01em;color:var(--ink);
}
.doc__section-title em{font-style:italic}
.doc__section-jp{
  display:block;margin-top:8px;font-family:'Manrope',sans-serif;
  font-size:11px;font-weight:400;color:var(--ink-dim);
  letter-spacing:0.05em;
}

.doc__content{
  font-family:'Manrope',sans-serif;font-size:15.5px;font-weight:300;
  line-height:1.85;color:var(--ink);max-width:62ch;
}
.doc__content p+p,
.doc__content p+ul,
.doc__content ul+p,
.doc__content h3+p,
.doc__content h3+ul{margin-top:1.2em}
.doc__content h3{
  font-family:'JetBrains Mono',monospace;font-size:10.5px;
  letter-spacing:0.25em;text-transform:uppercase;color:var(--ink-dim);
  margin-top:2em;margin-bottom:.8em;font-weight:400;
}
.doc__content h3:first-child{margin-top:0}
.doc__content ul{list-style:none;padding-left:0}
.doc__content li{position:relative;padding-left:20px;margin-bottom:.4em}
.doc__content li::before{content:'—';position:absolute;left:0;top:0;color:var(--ink-faint)}
.doc__content em{
  font-family:'Instrument Serif',serif;font-style:italic;
  color:var(--accent);font-size:1.05em;
}
.doc__content a{
  color:var(--ink);text-decoration:none;
  border-bottom:1px solid var(--rule);
  transition:border-color .3s ease;
}
.doc__content a:hover{border-color:var(--accent)}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width:900px){
  .nav{padding:18px 22px}
  .nav__links{display:none}
  .footer{padding:48px 22px 24px}
  .footer__top{grid-template-columns:1fr;gap:32px;margin-bottom:48px}
  .footer__bottom{font-size:9px}
  .crosshair--tr,.crosshair--br{display:none}

  /* Home */
  .hero{padding:90px 22px 32px}
  .section{padding:96px 22px}
  .about__grid{grid-template-columns:1fr;gap:64px}
  .about__headline{margin-bottom:64px}
  .service{grid-template-columns:60px 1fr;gap:18px;padding:40px 0}
  .service__desc{grid-column:2;padding-top:12px}
  .service__meta{grid-column:1 / -1;padding-top:18px;text-align:left}
  .info__row{grid-template-columns:1fr;gap:6px;padding:24px 0}
  .info__index{display:none}

  /* Doc */
  .doc{padding:120px 22px 0}
  .doc__hero{margin-bottom:64px;padding-bottom:48px}
  .doc__meta{gap:24px}
  .doc__section{grid-template-columns:1fr;gap:32px;padding:40px 0}
  .doc__section-head{position:static}
}