/* ==========================================================================
   Blackstrat Ventures LLP — corporate site
   Brand system v0.1 · Ink / Bone / Pine Green
   ========================================================================== */

:root{
  --ink:#141A24;
  --ink-deep:#0A1018;
  --ink-mid:#0C131D;
  --bone:#F1EFE8;
  --surface:#FBFAF5;
  --surface-2:#EAE7DD;
  --graphite:#454C56;
  --ash:#8A8E88;
  --line:#D7D3C8;
  --line-strong:#BFBAAD;
  --pine:#14432F;        /* deep — on paper */
  --pine-lift:#4FA07C;   /* lifted — on ink */

  --serif:"Charter","Iowan Old Style","Georgia","Times New Roman",serif;
  --sans:"Helvetica Neue","Helvetica","Arial",sans-serif;
  --mono:ui-monospace,"SF Mono","Menlo","Consolas",monospace;

  --pad:clamp(20px,5vw,72px);
  --maxw:1160px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  background:var(--bone);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.62;
  letter-spacing:.004em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

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

a{color:inherit}
img,svg{max-width:100%;height:auto}

:focus-visible{outline:2px solid var(--pine-lift);outline-offset:3px}

.skip{
  position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;
  padding:12px 18px;z-index:100;font-family:var(--mono);font-size:12px;
}
.skip:focus{left:0}

/* ---------- shared type ---------- */
.eyebrow{
  font-family:var(--mono);font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--ash);font-weight:500;margin:0;
}
.eyebrow .sep{color:var(--pine)}
h2{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(27px,3.6vw,42px);line-height:1.08;letter-spacing:-.014em;
  margin:14px 0 0;text-wrap:balance;
}
h3{
  font-family:var(--sans);font-weight:700;font-size:17px;line-height:1.3;
  letter-spacing:-.005em;margin:0;
}
p{margin:0}
.section-lead{
  font-family:var(--serif);font-size:clamp(18px,2vw,21px);line-height:1.5;
  color:var(--graphite);max-width:60ch;margin-top:20px;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(10,16,24,.92);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid rgba(255,255,255,.10);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding-block:16px;
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex:none}
.brand img{width:30px;height:30px;display:block}
.brand-word{
  font-family:var(--sans);font-weight:700;text-transform:uppercase;
  font-size:16px;letter-spacing:-.01em;color:#F4F1EA;line-height:1;
}
.brand-word .strat{color:var(--pine-lift)}
.brand-sub{
  display:block;font-family:var(--mono);font-size:7.5px;letter-spacing:.3em;
  color:#8A93A0;margin-top:4px;font-weight:500;
}
.nav{display:flex;align-items:center;gap:clamp(14px,2.4vw,30px)}
.nav a{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:#C4C7CC;text-decoration:none;padding:6px 0;border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.nav a:hover{color:#F4F1EA;border-bottom-color:var(--pine-lift)}
.nav a.cta{
  color:var(--ink-deep);background:var(--pine-lift);border:none;
  padding:9px 16px;border-radius:3px;font-weight:700;
}
.nav a.cta:hover{background:#63B58F;color:var(--ink-deep)}
@media(max-width:720px){
  .nav a:not(.cta){display:none}
}

/* ---------- hero ---------- */
.hero{
  background:
    radial-gradient(120% 90% at 84% 6%, rgba(79,160,124,.15), transparent 48%),
    linear-gradient(180deg,var(--ink-deep) 0%, var(--ink-mid) 62%, #0A0F17 100%);
  color:#EEEBE2;
  padding-block:clamp(64px,11vw,132px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.hero h1{
  font-family:var(--sans);font-weight:700;
  font-size:clamp(40px,8.2vw,92px);line-height:.96;letter-spacing:-.03em;
  margin:22px 0 0;color:#F4F1EA;text-wrap:balance;
}
.hero h1 .em{color:var(--pine-lift)}
.hero .eyebrow{color:#8A93A0}
.hero .eyebrow .sep{color:var(--pine-lift)}
.hero-lead{
  font-family:var(--serif);font-size:clamp(19px,2.4vw,26px);line-height:1.42;
  color:#C9CCD1;max-width:44ch;margin-top:28px;
}
.hero-seam{width:56px;height:3px;background:var(--pine-lift);margin-top:36px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.btn{
  display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;text-decoration:none;padding:14px 26px;border-radius:3px;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.btn-primary{background:var(--pine-lift);color:var(--ink-deep);font-weight:700}
.btn-primary:hover{background:#63B58F}
.btn-ghost{border:1px solid rgba(255,255,255,.26);color:#EEEBE2}
.btn-ghost:hover{border-color:var(--pine-lift);color:var(--pine-lift)}

/* ---------- section scaffold ---------- */
.section{padding-block:clamp(56px,8vw,104px);border-top:1px solid var(--line)}
.section:first-of-type{border-top:none}
.section-head{max-width:64ch}

/* ---------- capability grid ---------- */
.cards{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:1px;background:var(--line);border:1px solid var(--line);margin-top:44px;
}
@media (max-width:1000px){.cards{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.cards{grid-template-columns:1fr}}
.card{background:var(--surface);padding:30px 28px 34px;display:flex;flex-direction:column;gap:12px}
.card .num{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;color:var(--pine);
  font-variant-numeric:tabular-nums;
}
.card p{font-size:15px;line-height:1.55;color:var(--graphite)}

/* ---------- sectors ---------- */
.sectors{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));
  gap:0;margin-top:44px;border-top:1px solid var(--line);
}
.sector{
  padding:22px 0;border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start;
}
.sector .seam{width:16px;height:2px;background:var(--pine);margin-top:11px;flex:none}
.sector h3{font-size:15.5px}
.sector p{font-size:14px;color:var(--graphite);margin-top:5px;line-height:1.5}
.sector .qual{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--pine);display:inline-block;margin-top:7px;
  border:1px solid var(--line-strong);border-radius:20px;padding:2px 8px;
}
@media(min-width:760px){
  .sectors{column-gap:56px}
}

/* ---------- approach ---------- */
.principles{display:grid;gap:0;margin-top:40px;border-top:1px solid var(--line)}
.principle{
  display:grid;grid-template-columns:minmax(0,22ch) minmax(0,1fr);gap:clamp(18px,4vw,56px);
  padding:26px 0;border-bottom:1px solid var(--line);align-items:baseline;
}
.principle h3{font-family:var(--serif);font-weight:600;font-size:20px;letter-spacing:-.01em}
.principle p{color:var(--graphite);font-size:15.5px;line-height:1.58}
@media(max-width:700px){.principle{grid-template-columns:1fr;gap:8px}}

/* ---------- work ---------- */
.work{
  margin-top:44px;border:1px solid var(--line);border-radius:4px;
  background:var(--surface);overflow:hidden;
}
.work-body{padding:clamp(26px,4vw,44px)}
.work .kicker{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--pine);
}
.work h3{font-family:var(--serif);font-weight:600;font-size:clamp(21px,2.6vw,28px);
  letter-spacing:-.012em;margin-top:12px;line-height:1.2}
.work p{color:var(--graphite);margin-top:16px;max-width:66ch;font-size:15.5px}
.work-meta{
  display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;padding-top:20px;
  border-top:1px solid var(--line);
}
.tag{
  font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--graphite);border:1px solid var(--line-strong);border-radius:20px;padding:4px 11px;
}

/* ---------- firm ---------- */
.firm{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:clamp(28px,6vw,80px);margin-top:40px;align-items:start}
.firm p + p{margin-top:16px}
.firm p{color:var(--graphite);font-size:16px}
.facts{border-left:2px solid var(--pine);padding-left:22px}
.fact{padding-block:12px;border-bottom:1px solid var(--line)}
.fact:last-child{border-bottom:none}
.fact dt{font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--ash)}
.fact dd{margin:5px 0 0;font-size:15px;font-weight:600}
@media(max-width:820px){.firm{grid-template-columns:1fr}}

/* ---------- contact ---------- */
.contact{
  background:
    radial-gradient(110% 120% at 88% 0%, rgba(79,160,124,.14), transparent 52%),
    var(--ink-deep);
  color:#EEEBE2;padding-block:clamp(58px,8vw,104px);
}
.contact h2{color:#F4F1EA}
.contact .eyebrow{color:#8A93A0}
.contact .eyebrow .sep{color:var(--pine-lift)}
.contact p{color:#C4C7CC;max-width:52ch;margin-top:20px;font-family:var(--serif);font-size:clamp(18px,2vw,21px);line-height:1.5}
.contact-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px;align-items:center}
.mail{
  font-family:var(--mono);font-size:clamp(14px,2vw,18px);letter-spacing:.02em;
  color:var(--pine-lift);text-decoration:none;border-bottom:1px solid rgba(79,160,124,.4);
  padding-bottom:3px;
}
.mail:hover{border-bottom-color:var(--pine-lift)}

/* ---------- footer ---------- */
.site-footer{background:var(--ink-mid);color:#8A93A0;padding-block:38px;border-top:1px solid rgba(255,255,255,.08)}
.footer-inner{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:flex-end}
.footer-brand{display:flex;align-items:center;gap:11px}
.footer-brand img{width:24px;height:24px}
.footer-word{font-family:var(--sans);font-weight:700;text-transform:uppercase;font-size:13px;color:#EEEBE2;letter-spacing:-.01em}
.footer-word .strat{color:var(--pine-lift)}
.footer-meta{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;line-height:2;text-align:right}
@media(max-width:620px){.footer-meta{text-align:left}}

/* ── Hero fork (business lines, stated once) ─────────────── */
.fork{
  margin:26px 0 0;
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--ash);
  text-transform:uppercase;
}
.fork .sep{color:var(--pine-lift);padding-inline:10px}

/* ── The model — four-stage ladder ───────────────────────── */
.ladder{
  list-style:none;
  margin:0;padding:0;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--line);
  border-block:1px solid var(--line-strong);
}
.step{
  background:var(--surface);
  padding:28px 24px 30px;
  display:flex;flex-direction:column;gap:14px;
}
.step .num{
  font-family:var(--mono);
  font-size:13px;
  color:var(--pine);
}
.step h3{margin:0 0 8px;font-size:19px;line-height:1.3}
.step p{margin:0;font-size:15px;line-height:1.6;color:var(--graphite)}
@media (max-width:900px){
  .ladder{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .ladder{grid-template-columns:1fr}
}

/* ── Footer identity line ────────────────────────────────── */
.footer-line{
  display:block;
  margin-top:6px;
  font-size:13px;
  color:var(--ash);
}