/* ════════════════════════════════════════════════════════════════
   TRVST.ESTATE — zero-knowledge trust protocol
   Aesthetic: a sealed dossier. Classical serif on warm paper; a
   redaction/proof motif (sealed bars, a verification register).
   Restrained graphite ink, oxblood seal. CSS only, no JS.
   ════════════════════════════════════════════════════════════════ */

:root{
  color-scheme: light dark;
  --paper:#f6f4ee;
  --paper-2:#efece3;
  --ink:#1b1a17;
  --ink-2:#43413b;
  --muted:#73706a;
  --rule:#ddd9cf;
  --rule-2:#cbc6ba;
  --seal:#7a2230;        /* oxblood — the stamp */
  --seal-ink:#f6f4ee;
  --redact:#1b1a17;      /* the bar that withholds */
  --field:#e8e4da;
  --measure:38rem;
  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark){
  :root{
    --paper:#15140f;
    --paper-2:#1d1b15;
    --ink:#efece3;
    --ink-2:#cbc7bc;
    --muted:#928e83;
    --rule:#2e2b24;
    --rule-2:#3c382f;
    --seal:#c25a68;
    --seal-ink:#15140f;
    --redact:#efece3;
    --field:#26241d;
  }
}

*{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:clamp(17px,1.05vw + 14px,19px);
  line-height:1.62;
  font-synthesis:none;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
  /* faint ledger ruling in the page ground */
  background-image:
    linear-gradient(var(--paper),var(--paper)),
    repeating-linear-gradient(0deg, transparent 0 47px, color-mix(in oklab,var(--rule) 35%,transparent) 47px 48px);
  background-attachment:fixed;
}

.wrap, main, header, footer{ }

/* ── shared layout ── */
.masthead, main > section, .colophon{
  max-width:72rem;
  margin-inline:auto;
  padding-inline:clamp(1.4rem,5vw,4rem);
}

/* ── skip link / focus ── */
.skip-link{
  position:absolute; left:-9999px; top:0; z-index:100;
  background:var(--ink); color:var(--paper);
  padding:.6rem 1rem; font-family:var(--mono); font-size:.85rem;
  border-radius:0 0 .4rem 0;
}
.skip-link:focus{ left:0; }
a:focus-visible, [tabindex]:focus-visible{
  outline:2px solid var(--seal); outline-offset:3px; border-radius:1px;
}

/* ════════════ MASTHEAD ════════════ */
.masthead{
  padding-top:clamp(2rem,5vw,3.5rem);
  padding-bottom:clamp(1.6rem,3vw,2.2rem);
  display:flex; flex-wrap:wrap; align-items:baseline;
  justify-content:space-between; gap:.5rem 1.5rem;
  border-bottom:1px solid var(--rule);
}
.wordmark{
  margin:0; font-family:var(--serif); font-weight:600;
  font-size:clamp(1.6rem,5vw,2.4rem);
  letter-spacing:.04em;
}
.wordmark .seg{ }
.wordmark .seg--light{ color:var(--muted); font-weight:500; }
.wordmark .dot{ color:var(--seal); margin-inline:.04em; }
.masthead-meta{
  margin:0; font-family:var(--mono);
  font-size:.74rem; letter-spacing:.18em; text-transform:uppercase;
  color:var(--muted);
}

/* ════════════ HERO ════════════ */
main{ display:block; }
.hero{ padding-block:clamp(3rem,8vw,6rem) clamp(2.5rem,6vw,4.5rem); }
.kicker{
  margin:0 0 1.2rem; font-family:var(--mono);
  font-size:.76rem; letter-spacing:.22em; text-transform:uppercase;
  color:var(--seal);
}
.lede{
  margin:0 0 1.6rem;
  font-size:clamp(2rem,6vw,3.6rem);
  line-height:1.08; letter-spacing:-.012em; font-weight:600;
  max-width:18ch;
}
.lede-em{ color:var(--muted); font-weight:500; font-style:italic; }
.sub{
  margin:0; max-width:var(--measure); color:var(--ink-2);
  font-size:clamp(1.02rem,1.6vw,1.18rem);
}
.vmark{
  font-family:var(--mono); font-weight:600; color:var(--seal);
  letter-spacing:.02em; font-style:normal;
}

/* the proof seal — public statement, redacted body, VALID stamp */
.seal{
  margin-top:clamp(2.4rem,5vw,3.4rem);
  display:inline-flex; align-items:center; gap:1rem; flex-wrap:wrap;
  padding:1rem 1.2rem;
  background:var(--paper-2);
  border:1px solid var(--rule-2);
  border-radius:.5rem;
  box-shadow:0 1px 0 color-mix(in oklab,var(--rule-2) 60%,transparent);
}
.seal-line{
  font-family:var(--mono); font-size:.82rem; letter-spacing:.16em;
  text-transform:uppercase; color:var(--muted);
}
.seal-redact{
  display:inline-block; width:clamp(8rem,30vw,16rem); height:1.05rem;
  border-radius:2px;
  background:
    repeating-linear-gradient(90deg,
      var(--redact) 0 1.6rem,
      color-mix(in oklab,var(--redact) 78%,var(--paper)) 1.6rem 2rem);
}
.seal-stamp{
  font-family:var(--mono); font-weight:700; font-size:.8rem;
  letter-spacing:.24em;
  color:var(--seal-ink); background:var(--seal);
  padding:.28rem .7rem; border-radius:3px;
  transform:rotate(-2deg);
}

/* ════════════ BAND — the thesis ════════════ */
.band{
  margin-top:clamp(2rem,5vw,4rem);
  display:grid; grid-template-columns:1fr; gap:clamp(1.6rem,4vw,3rem);
  align-items:center;
  padding-block:clamp(2.4rem,6vw,4rem);
  border-block:1px solid var(--rule);
}
.band-figure{
  min-height:clamp(11rem,30vw,16rem); border-radius:.6rem;
  border:1px solid var(--rule-2);
  /* a commitment: a public node bound to a withheld field */
  background:
    radial-gradient(circle at 22% 30%, color-mix(in oklab,var(--seal) 60%,transparent) 0 7px, transparent 8px),
    radial-gradient(circle at 78% 72%, color-mix(in oklab,var(--ink) 30%,transparent) 0 5px, transparent 6px),
    linear-gradient(135deg, var(--paper-2), var(--field)),
    repeating-linear-gradient(45deg, transparent 0 13px, color-mix(in oklab,var(--rule-2) 70%,transparent) 13px 14px);
  position:relative; overflow:hidden;
}
.band-figure::after{
  content:""; position:absolute; inset:auto 0 28% 12%;
  height:1.1rem; width:46%;
  background:linear-gradient(90deg,var(--redact),color-mix(in oklab,var(--redact) 40%,transparent));
  border-radius:2px; transform:rotate(-1.5deg);
}
.band-body p{ margin:0 0 1rem; max-width:var(--measure); color:var(--ink-2); }
.band-body p:last-child{ margin-bottom:0; }
.band-body em{ color:var(--ink); font-style:italic; }

@media (min-width:60rem){
  .band{ grid-template-columns:0.9fr 1.1fr; }
}

/* shared section heads */
.label{
  margin:0 0 .9rem; font-family:var(--mono);
  font-size:.74rem; letter-spacing:.2em; text-transform:uppercase;
  color:var(--seal);
}
h2{
  margin:0 0 1rem; font-weight:600; letter-spacing:-.01em;
  font-size:clamp(1.5rem,3.4vw,2.2rem); line-height:1.18;
  max-width:24ch;
}
h3{ margin:0 0 .5rem; font-weight:600; font-size:1.12rem; letter-spacing:-.005em; }

/* ════════════ HOW IT WORKS ════════════ */
.works{ padding-block:clamp(2.8rem,7vw,4.6rem); }
.works-head{ margin-bottom:clamp(1.6rem,4vw,2.4rem); }
.steps{
  list-style:none; margin:0; padding:0;
  display:grid; gap:1px; background:var(--rule);
  border:1px solid var(--rule); border-radius:.6rem; overflow:hidden;
}
.step{
  background:var(--paper); padding:clamp(1.3rem,3vw,1.8rem);
  position:relative;
}
.step-n{
  font-family:var(--mono); font-size:.8rem; letter-spacing:.14em;
  color:var(--seal); display:block; margin-bottom:.7rem;
}
.step p{ margin:0; color:var(--ink-2); font-size:.98rem; }
@media (min-width:46rem){ .steps{ grid-template-columns:repeat(2,1fr); } }
@media (min-width:72rem){ .steps{ grid-template-columns:repeat(4,1fr); } }

/* ════════════ LEDGER / REGISTER ════════════ */
.ledger{
  padding-block:clamp(2.8rem,7vw,4.6rem);
  border-top:1px solid var(--rule);
}
.ledger-head{ margin-bottom:clamp(1.4rem,3vw,2rem); }
.ledger-note{ margin:.4rem 0 0; max-width:var(--measure); color:var(--muted); font-size:.98rem; }
.register{
  width:100%; border-collapse:collapse; font-size:.96rem;
  border:1px solid var(--rule-2); border-radius:.5rem; overflow:hidden;
}
.register th, .register td{
  text-align:left; padding:.85rem 1rem;
  border-bottom:1px solid var(--rule);
  vertical-align:top;
}
.register thead th{
  font-family:var(--mono); font-size:.7rem; letter-spacing:.16em;
  text-transform:uppercase; color:var(--muted);
  background:var(--paper-2); font-weight:400;
}
.register tbody tr:last-child td{ border-bottom:0; }
.register tbody td:first-child{ font-weight:600; color:var(--ink); }
.register tbody td:nth-child(2){ color:var(--ink-2); }
/* the withheld column reads as redacted-but-labelled */
.register tbody td:last-child{ color:var(--muted); font-style:italic; }
.register tbody tr:hover{ background:color-mix(in oklab,var(--seal) 6%,var(--paper)); }
@media (max-width:38rem){
  .register, .register thead, .register tbody, .register tr, .register th, .register td{ display:block; }
  .register thead{ position:absolute; left:-9999px; }
  .register tr{ border-bottom:1px solid var(--rule-2); padding:.4rem 0; }
  .register td{ border:0; padding:.35rem 1rem; }
  .register tbody td:first-child{ padding-top:.8rem; font-size:1.02rem; }
  .register tbody td:nth-child(2)::before{ content:"discloses — "; color:var(--muted); font-style:normal; }
  .register tbody td:last-child::before{ content:"withholds — "; color:var(--muted); font-style:normal; }
}

/* ════════════ WHO IT'S FOR ════════════ */
.for{
  padding-block:clamp(2.8rem,7vw,4.6rem);
  border-top:1px solid var(--rule);
}
.for-head{ margin-bottom:clamp(1.6rem,4vw,2.4rem); }
.for-grid{ display:grid; gap:1.2rem; }
.audience{
  padding:clamp(1.3rem,3vw,1.7rem);
  background:var(--paper-2);
  border:1px solid var(--rule);
  border-left:3px solid var(--seal);
  border-radius:.5rem;
}
.audience p{ margin:0; color:var(--ink-2); font-size:.98rem; }
@media (min-width:46rem){ .for-grid{ grid-template-columns:repeat(2,1fr); } }

/* ════════════ INSTANCE / CONSTELLATION TIE ════════════ */
.instance{
  padding-block:clamp(2.8rem,7vw,4.4rem);
  border-top:1px solid var(--rule);
}
.instance-line{
  margin:0; max-width:46rem;
  font-size:clamp(1.15rem,2.2vw,1.5rem); line-height:1.4;
  color:var(--ink);
}
.instance-line a{ color:var(--seal); text-decoration:underline; text-decoration-thickness:1px; text-underline-offset:3px; }
.instance-line a:hover{ text-decoration-thickness:2px; }

/* ════════════ FOOTER ════════════ */
.colophon{
  margin-top:clamp(2rem,5vw,3rem);
  padding-block:clamp(2.4rem,5vw,3.4rem) clamp(1.6rem,4vw,2.4rem);
  border-top:1px solid var(--rule-2);
}
.colophon-grid{
  display:grid; gap:clamp(1.6rem,4vw,3rem);
  margin-bottom:2rem;
}
.wordmark--sm{ font-size:1.25rem; margin:0 0 .5rem; }
.wordmark--sm .dot{ color:var(--seal); }
.colophon-tag{ margin:0; font-family:var(--mono); font-size:.78rem; letter-spacing:.12em; color:var(--muted); }
.colophon-h{
  margin:0 0 .7rem; font-family:var(--mono); font-size:.7rem;
  letter-spacing:.2em; text-transform:uppercase; color:var(--muted);
}
.colophon-nav ul{ list-style:none; margin:0; padding:0; display:grid; gap:.45rem; }
.colophon-nav a{
  color:var(--ink-2); text-decoration:none; font-size:.95rem;
  border-bottom:1px solid transparent; padding-bottom:1px;
}
.colophon-nav a:hover{ color:var(--ink); border-bottom-color:var(--rule-2); }
.colophon-fine{
  margin:0; padding-top:1.4rem; border-top:1px solid var(--rule);
  font-family:var(--mono); font-size:.74rem; letter-spacing:.06em;
  color:var(--muted);
}
@media (min-width:52rem){
  .colophon-grid{ grid-template-columns:1fr 1fr; align-items:start; }
}

/* ════════════ REVEALS (scroll-driven; safe defaults) ════════════ */
@supports (animation-timeline:view()){
  @media (prefers-reduced-motion:no-preference){
    .reveal{
      animation:reveal-in linear both;
      animation-timeline:view();
      animation-range:entry 0% entry 42%;
    }
    @keyframes reveal-in{
      from{ opacity:0; transform:translateY(14px); }
      to{ opacity:1; transform:none; }
    }
  }
}

@media (prefers-reduced-motion:reduce){
  *{ animation:none !important; transition:none !important; scroll-behavior:auto !important; }
}