/* Blackvault Engineering Group — homepage
   Shared brand tokens with brand/brand-guidelines + the deck. */

:root{
  --vault:#0E1116;
  --vault-2:#171C22;
  --surface:#F7F8FA;
  --ink:#14181D;
  --muted:#5B6470;
  --faint:#C8CDD6;
  --accent:#3FB6A8;
  --accent-ink:#1C6B60;
  --brass:#C7A24A;
  --hair:#E2E5EA;
  --sans:"Inter","Segoe UI",-apple-system,BlinkMacSystemFont,system-ui,Helvetica,Arial,sans-serif;
  --mono:"SFMono-Regular","Cascadia Code","Consolas",ui-monospace,monospace;
  --maxw:1120px;
  --pad:clamp(1.25rem,5vw,2.5rem);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; background:var(--surface); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.6;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
h1,h2,h3{ letter-spacing:-0.02em; line-height:1.08; margin:0; }
a{ color:inherit; text-decoration:none; }
code{
  font-family:var(--mono); font-size:.88em; background:#EEF1F4; color:#2A3038;
  padding:.1em .4em; border-radius:3px;
}

.wrap{ max-width:var(--maxw); margin:0 auto; padding-left:var(--pad); padding-right:var(--pad); }
.wrap.narrow{ max-width:760px; }

/* ---------- eyebrow / shared bits ---------- */
.eyebrow{
  font-family:var(--mono); font-size:.72rem; letter-spacing:.22em; text-transform:uppercase;
  color:var(--muted); margin:0 0 .9rem;
}
.eyebrow.accent{ color:var(--accent-ink); }
.lede{ font-size:1.18rem; color:var(--ink); }
.section-intro{ color:var(--muted); font-size:1.05rem; margin:.4rem 0 2.4rem; }

/* ---------- buttons ---------- */
.btn{
  display:inline-block; font-weight:600; font-size:.98rem; letter-spacing:.01em;
  padding:.8rem 1.4rem; border-radius:7px; border:1px solid transparent;
  transition:transform .12s ease, background .15s ease, border-color .15s ease;
}
.btn:active{ transform:translateY(1px); }
.btn-primary{ background:var(--accent); color:#06201D; }
.btn-primary:hover{ background:#4ec8b9; }
.btn-ghost{ border-color:rgba(255,255,255,.28); color:#fff; }
.btn-ghost:hover{ border-color:#fff; }
.btn-lg{ padding:.95rem 1.8rem; font-size:1.05rem; }

/* ---------- header ---------- */
.site-head{
  position:sticky; top:0; z-index:20; background:rgba(14,17,22,.88);
  backdrop-filter:saturate(140%) blur(8px); color:#fff;
  display:flex; align-items:center; justify-content:space-between;
  gap:1rem; padding:.85rem var(--pad); border-bottom:1px solid rgba(255,255,255,.08);
}
.brand{ font-weight:700; font-size:1.05rem; display:flex; align-items:center; gap:.55rem; letter-spacing:-.01em; }
.brand-sub{ color:var(--faint); font-weight:500; }
.brand-mark-img{ display:block; flex:0 0 auto; }
.nav{ display:flex; align-items:center; gap:1.6rem; font-size:.95rem; }
.nav a{ color:var(--faint); }
.nav a:hover{ color:#fff; }
.nav .nav-cta{
  color:#06201D; background:var(--accent); padding:.5rem .9rem; border-radius:6px; font-weight:600;
}
.nav .nav-cta:hover{ background:#4ec8b9; color:#06201D; }

/* ---------- hero ---------- */
.hero{
  background:
    radial-gradient(120% 90% at 85% -10%, rgba(63,182,168,.16), transparent 60%),
    var(--vault);
  color:#fff; padding:clamp(4rem,11vw,8rem) 0 clamp(3.5rem,9vw,6rem);
  position:relative;
}
.hero::after{
  content:""; position:absolute; left:var(--pad); bottom:clamp(2rem,6vw,3.5rem);
  width:64px; height:3px; background:var(--accent);
}
.hero .eyebrow{ color:var(--accent); }
.hero h1{ font-size:clamp(2.6rem,7vw,4.6rem); max-width:14ch; }
.hero-sub{ font-size:clamp(1.1rem,2.2vw,1.4rem); color:var(--faint); max-width:46ch; margin:1.4rem 0 2rem; }
.cta-row{ display:flex; flex-wrap:wrap; gap:.85rem; }
.hero-micro{ font-family:var(--mono); font-size:.8rem; letter-spacing:.06em; color:var(--faint); margin-top:1.4rem; }
.hero-mark{
  position:absolute; right:clamp(1.5rem,6vw,6rem); top:50%; transform:translateY(-48%);
  height:min(56vh,400px); width:auto; pointer-events:none; z-index:0;
  filter:drop-shadow(0 26px 55px rgba(0,0,0,.55));
}
.hero .wrap{ position:relative; z-index:1; }
@media (max-width:900px){ .hero-mark{ display:none; } }

/* ---------- trust strip (placeholder) ---------- */
.trust{ background:var(--vault-2); color:var(--faint); padding:1.1rem 0; border-bottom:1px solid rgba(255,255,255,.06); }
.trust p{ margin:0; font-size:.95rem; }
.trust code{ background:rgba(255,255,255,.08); color:#e7ebf0; }

/* ---------- placeholder marking ---------- */
[data-placeholder]{ position:relative; outline:1px dashed rgba(199,162,74,.55); outline-offset:-1px; }
.ph-tag{
  display:inline-block; font-family:var(--mono); font-size:.66rem; letter-spacing:.12em;
  text-transform:uppercase; font-weight:700; color:var(--vault); background:var(--brass);
  padding:.2rem .55rem; border-radius:4px; margin-bottom:1rem;
}

/* ---------- generic section spacing ---------- */
section{ padding:clamp(3.5rem,8vw,6rem) 0; }
.problem h2,.services h2,.approach h2,.why h2,.case h2{ font-size:clamp(1.8rem,4vw,2.6rem); }

/* ---------- problem ---------- */
.problem{ background:#fff; border-bottom:1px solid var(--hair); }
.problem h2{ margin:.2rem 0 1.1rem; }

/* ---------- services ---------- */
.grid{ display:grid; gap:1.1rem; }
.grid-services{ grid-template-columns:repeat(3,1fr); }
.card{
  background:#fff; border:1px solid var(--hair); border-radius:12px; padding:1.6rem 1.5rem;
  border-top:3px solid var(--accent); transition:transform .14s ease, box-shadow .14s ease;
}
.card:hover{ transform:translateY(-3px); box-shadow:0 12px 30px -18px rgba(14,17,22,.45); }
.card h3{ font-size:1.18rem; margin-bottom:.55rem; }
.card p{ margin:0; color:var(--muted); font-size:1rem; }

/* ---------- why ---------- */
.why{ background:var(--vault); color:#fff; }
.why .eyebrow{ color:var(--accent); }
.why-grid{ display:grid; grid-template-columns:1.1fr 1fr; gap:clamp(2rem,5vw,4rem); align-items:start; }
.why-lead .lede{ color:var(--faint); }
.why-points{ list-style:none; margin:0; padding:0; display:grid; gap:1.4rem; }
.why-points li{ border-left:2px solid var(--accent); padding-left:1.2rem; }
.why-points h3{ font-size:1.15rem; margin-bottom:.35rem; }
.why-points p{ margin:0; color:var(--faint); }

/* ---------- approach ---------- */
.approach{ background:#fff; }
.steps{ list-style:none; margin:0; padding:0; display:grid; grid-template-columns:repeat(4,1fr); gap:1.2rem; counter-reset:step; }
.steps li{ padding-top:.5rem; border-top:1px solid var(--hair); }
.step-n{
  display:inline-flex; align-items:center; justify-content:center; width:2.1rem; height:2.1rem;
  border-radius:50%; background:var(--vault); color:var(--accent); font-family:var(--mono);
  font-weight:700; font-size:1rem; margin-bottom:.9rem;
}
.steps h3{ font-size:1.2rem; margin-bottom:.4rem; }
.steps p{ margin:0; color:var(--muted); font-size:.98rem; }

/* ---------- case (placeholder) ---------- */
.case{ background:var(--surface); }
.case h2{ margin:.2rem 0 1rem; }
.case .btn{ margin-top:1.4rem; }
.case .btn-ghost{ border-color:var(--vault); color:var(--vault); }
.case .btn-ghost:hover{ background:var(--vault); color:#fff; }

/* ---------- closing ---------- */
.closing{ background:var(--vault); color:#fff; text-align:center; }
.closing h2{ font-size:clamp(2rem,5vw,3rem); }
.closing .lede{ color:var(--faint); max-width:48ch; margin:1.1rem auto 2rem; }

/* ---------- footer ---------- */
.site-foot{ background:#090B0E; color:var(--faint); padding:3rem 0 2.4rem; }
.foot-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:2rem; align-items:start; }
.foot-brand{ display:flex; flex-direction:column; gap:.5rem; }
.foot-brand-row{ display:flex; align-items:center; gap:.5rem; }
.foot-name{ color:#fff; font-weight:700; }
.foot-tag{ font-family:var(--mono); font-size:.78rem; letter-spacing:.05em; color:var(--accent); }
.foot-nav{ display:flex; flex-direction:column; gap:.55rem; font-size:.95rem; }
.foot-nav a:hover{ color:#fff; }
.foot-legal{ font-size:.88rem; }
.foot-legal a:hover{ color:#fff; }
.foot-legal p{ margin:.9rem 0 0; color:#6A727E; }

/* ---------- responsive ---------- */
@media (max-width:880px){
  .grid-services{ grid-template-columns:1fr 1fr; }
  .why-grid{ grid-template-columns:1fr; }
  .steps{ grid-template-columns:1fr 1fr; }
  .foot-grid{ grid-template-columns:1fr 1fr; }
}
@media (max-width:560px){
  .brand-sub{ display:none; }
  .nav{ gap:1rem; }
  .nav a:not(.nav-cta){ display:none; }
  .grid-services{ grid-template-columns:1fr; }
  .steps{ grid-template-columns:1fr; }
  .foot-grid{ grid-template-columns:1fr; }
}