/* ============================================================
   Acumen Squared Ltd — design tokens
   ============================================================ */
:root{
  --bg:            #0e1013;
  --surface:       #171a1e;
  --surface-raised:#1e2227;
  --line:          #2a2f35;

  --steel-100:     #e8ecef;
  --steel-300:     #aeb7be;
  --steel-500:     #7c868f;
  --steel-600:     #3a3f45;

  --signal:        #4c8dff;
  --signal-dim:    rgba(76,141,255,0.14);
  --signal-line:   rgba(76,141,255,0.35);

  --font-display: 'Space Grotesk', 'IBM Plex Sans', sans-serif;
  --font-body:    'IBM Plex Sans', system-ui, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, monospace;

  --wrap: 1160px;
}

*, *::before, *::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; }
}

body{
  margin:0;
  background:var(--bg);
  color:var(--steel-300);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

.wrap{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 32px;
}

h1,h2,h3{
  font-family:var(--font-display);
  color:var(--steel-100);
  margin:0;
  letter-spacing:-0.01em;
}

p{ margin:0; }

a{ color:inherit; text-decoration:none; }

img{ max-width:100%; display:block; }

::selection{ background:var(--signal-dim); color:var(--steel-100); }

/* Exponent motif — the brand's "squared" signature */
.exp{
  font-family:var(--font-mono);
  font-size:0.62em;
  vertical-align:super;
  color:var(--signal);
  margin-left:1px;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--steel-500);
  margin-bottom:14px;
}

.section-title{
  font-size:clamp(28px, 3.4vw, 40px);
  line-height:1.15;
  max-width:20ch;
  margin-bottom:16px;
}

.section-lede{
  max-width:56ch;
  font-size:17px;
  color:var(--steel-500);
}

/* ============================================================
   Buttons
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 24px;
  border-radius:6px;
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:500;
  letter-spacing:0.01em;
  border:1px solid transparent;
  cursor:pointer;
  transition:background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
  white-space:nowrap;
}
.btn:focus-visible{ outline:2px solid var(--signal); outline-offset:2px; }

.btn-signal{
  background:var(--signal);
  color:#0a0d10;
}
.btn-signal:hover{ background:#6ba0ff; transform:translateY(-1px); }

.btn-ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--steel-100);
}
.btn-ghost:hover{ border-color:var(--signal-line); color:var(--steel-100); }

/* ============================================================
   Header / nav
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(14,16,19,0.82);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.header-inner{
  display:flex;
  align-items:center;
  gap:32px;
  height:76px;
}

.brand-mark{
  height:46px;
  width:auto;
}

.main-nav{
  display:flex;
  gap:28px;
  margin-left:auto;
  font-size:14.5px;
  font-family:var(--font-mono);
}
.main-nav a{ color:var(--steel-300); transition:color 0.15s ease; }
.main-nav a:hover{ color:var(--steel-100); }

.nav-cta{ margin-left:8px; padding:10px 18px; }

.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:32px;
  height:32px;
  margin-left:auto;
  background:none;
  border:none;
  cursor:pointer;
}
.nav-toggle span{
  display:block;
  height:2px;
  width:100%;
  background:var(--steel-100);
}

.mobile-nav{
  display:none;
  flex-direction:column;
  padding:8px 32px 20px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
}
.mobile-nav a{
  padding:12px 0;
  border-bottom:1px solid var(--line);
  color:var(--steel-300);
}
.mobile-nav.open{ display:flex; }

@media (max-width: 860px){
  .main-nav, .nav-cta{ display:none; }
  .nav-toggle{ display:flex; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero{
  position:relative;
  overflow:hidden;
  padding-top:96px;
  border-bottom:1px solid var(--line);
}

.hero-grid{
  position:absolute;
  inset:0;
  z-index:0;
  mask-image:radial-gradient(ellipse 70% 60% at 60% 20%, black 40%, transparent 90%);
}
.hero-schematic{ width:100%; height:100%; }

.wire{
  stroke-dasharray:6 6;
  animation:dash 26s linear infinite;
}
.wire-b{ animation-duration:32s; animation-direction:reverse; }
.wire-c{ animation-duration:22s; }
.wire-d{ animation-duration:30s; animation-direction:reverse; }
@keyframes dash{ to{ stroke-dashoffset:-240; } }

.node{ opacity:0.85; }
.node-core{
  fill:var(--signal);
  animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{ opacity:0.9; }
  50%{ opacity:0.35; }
}

.hero-inner{
  position:relative;
  z-index:1;
  padding:64px 32px 80px;
  max-width:760px;
}

.hero-title{
  font-size:clamp(42px, 6.4vw, 74px);
  line-height:1.03;
  margin-bottom:24px;
}

.hero-sub{
  font-size:18px;
  max-width:52ch;
  color:var(--steel-300);
  margin-bottom:36px;
}

.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; }

.hero-strip{
  position:relative;
  z-index:1;
  border-top:1px solid var(--line);
  background:rgba(23,26,30,0.6);
}
.hero-strip-inner{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
  padding:18px 32px;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--steel-500);
}
.hero-strip .dot{ color:var(--signal); }

/* ============================================================
   Approach
   ============================================================ */
.approach{ padding:120px 0 100px; border-bottom:1px solid var(--line); }

.pillars{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--line);
  margin-top:56px;
  border:1px solid var(--line);
  border-radius:10px;
  overflow:hidden;
}
.pillar{
  background:var(--surface);
  padding:36px 32px;
}
.pillar-mark{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.1em;
  text-transform:uppercase;
  color:var(--steel-500);
  margin-bottom:20px;
}
.pillar h3{ font-size:21px; margin-bottom:10px; }
.pillar p{ font-size:15px; color:var(--steel-500); }

@media (max-width: 800px){
  .pillars{ grid-template-columns:1fr; }
}

/* ============================================================
   Services
   ============================================================ */
.services{ padding:120px 0; border-bottom:1px solid var(--line); }

.service-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:10px;
  overflow:hidden;
  margin-top:48px;
}

.service-card{
  position:relative;
  background:var(--surface);
  padding:32px 28px 30px;
  transition:background 0.2s ease;
}
.service-card:hover{ background:var(--surface-raised); }

.service-index{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--steel-500);
  margin-bottom:22px;
}
.service-index .exp{ font-size:0.75em; }

.service-card h3{
  font-size:18.5px;
  margin-bottom:10px;
  line-height:1.3;
}
.service-card p{
  font-size:14.5px;
  color:var(--steel-500);
}

.new-flag{
  position:absolute;
  top:28px;
  right:28px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--signal);
  border:1px solid var(--signal-line);
  background:var(--signal-dim);
  padding:3px 8px;
  border-radius:100px;
}

.extended-header{ margin-top:96px; }

@media (max-width: 900px){
  .service-grid{ grid-template-columns:repeat(2, 1fr); }
}
@media (max-width: 620px){
  .service-grid{ grid-template-columns:1fr; }
  .new-flag{ position:static; display:inline-block; margin-bottom:14px; }
}

/* ============================================================
   Process
   ============================================================ */
.process{ padding:120px 0; border-bottom:1px solid var(--line); }

.process-list{
  list-style:none;
  margin:56px 0 0;
  padding:0;
  max-width:640px;
}
.process-list li{
  display:flex;
  gap:28px;
  padding:28px 0;
  border-top:1px solid var(--line);
}
.process-list li:last-child{ border-bottom:1px solid var(--line); }

.process-num{
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--signal);
  padding-top:3px;
  flex:none;
  width:28px;
}
.process-list h3{ font-size:18px; margin-bottom:6px; }
.process-list p{ font-size:15px; color:var(--steel-500); }

/* ============================================================
   CTA band
   ============================================================ */
.cta-band{
  padding:88px 0;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(ellipse 60% 140% at 50% 0%, var(--signal-dim), transparent 70%),
    var(--bg);
}
.cta-inner{ text-align:center; max-width:620px; margin:0 auto; }
.cta-mark{ height:64px; width:auto; margin:0 auto 36px; }
.cta-inner h2{ font-size:clamp(26px,3.2vw,36px); margin-bottom:14px; }
.cta-inner p{ color:var(--steel-500); margin-bottom:30px; font-size:16px; }

@media (max-width: 620px){
  .cta-mark{ height:48px; margin-bottom:28px; }
}

/* ============================================================
   Contact
   ============================================================ */
.contact{ padding:120px 0; }

.contact-inner{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:80px;
  align-items:start;
}

.contact-details{
  margin-top:40px;
  display:flex;
  flex-direction:column;
  gap:20px;
}
.contact-details dt{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:0.1em;
  text-transform:uppercase;
  color:var(--steel-500);
  margin-bottom:4px;
}
.contact-details dd{
  margin:0;
  font-size:17px;
  color:var(--steel-100);
}
.contact-details a:hover{ color:var(--signal); }

.contact-form{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:12px;
  padding:32px;
}
.form-row{ margin-bottom:18px; display:flex; flex-direction:column; gap:8px; }
.form-row label{
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--steel-500);
  letter-spacing:0.04em;
}
.form-row input, .form-row textarea{
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:6px;
  padding:11px 13px;
  color:var(--steel-100);
  font-family:var(--font-body);
  font-size:15px;
  resize:vertical;
}
.form-row input:focus, .form-row textarea:focus{
  outline:none;
  border-color:var(--signal-line);
  box-shadow:0 0 0 3px var(--signal-dim);
}
.form-submit{ width:100%; margin-top:4px; }
.form-note{
  margin-top:14px;
  font-size:13.5px;
  color:var(--steel-500);
  font-family:var(--font-mono);
  min-height:1.4em;
}

@media (max-width: 860px){
  .contact-inner{ grid-template-columns:1fr; gap:48px; }
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer{
  border-top:1px solid var(--line);
  padding:40px 0;
}
.footer-inner{
  display:flex;
  align-items:center;
  gap:32px;
  flex-wrap:wrap;
}
.footer-mark{ height:36px; opacity:0.85; }
.footer-inner nav{ display:flex; gap:22px; font-family:var(--font-mono); font-size:13.5px; margin-right:auto; }
.footer-inner nav a{ color:var(--steel-500); }
.footer-inner nav a:hover{ color:var(--steel-100); }
.footer-copy{ font-size:12.5px; color:var(--steel-600); font-family:var(--font-mono); }

@media (max-width: 620px){
  .footer-inner{ flex-direction:column; align-items:flex-start; gap:18px; }
  .footer-inner nav{ margin-right:0; }
}