/* ============================================================
   BrainerHub Solutions — Design tokens
   ============================================================ */
:root{
  --paper:        #EEF0EA;
  --paper-raised: #FFFFFF;
  --ink:          #14201D;
  --ink-soft:     #47554F;
  --ink-faint:    #7C877F;
  --accent:       #2C5C8A;   /* signal blue */
  --accent-soft:  #E4ECF2;
  --accent-warm:  #C97A3D;   /* copper / amber */
  --accent-warm-soft: #F5E7D8;
  --line:         #D5D8CC;
  --line-strong:  #B9BEAE;

  --font-display: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --font-body:    'Source Serif 4', Georgia, serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  --max-w: 1180px;
  --pad: clamp(1.25rem, 4vw, 3rem);
}

*{ 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(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img{ max-width: 100%; display:block; }
a{ color: inherit; text-decoration: none; }

h1,h2,h3,h4{
  font-family: var(--font-display);
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.01em;
  font-weight: 600;
}

.wrap{
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
}
.eyebrow::before{
  content:"";
  width: 7px; height: 7px;
  border-radius: 1px;
  background: var(--accent-warm);
  display:inline-block;
  transform: rotate(45deg);
}

.section{
  padding: clamp(3.5rem, 7vw, 6.5rem) 0;
  position: relative;
}
.section-head{
  max-width: 640px;
  margin-bottom: clamp(2rem, 5vw, 3.25rem);
}
.section-head h2{
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  margin-top: 0.6rem;
  line-height: 1.15;
}
.section-head p{
  color: var(--ink-soft);
  margin-top: 0.9rem;
  font-size: 1.08rem;
}

/* ---------- Blueprint grid backdrop ---------- */
.grid-bg{
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 42px 42px;
  opacity: 0.5;
  mask-image: linear-gradient(to bottom, black, transparent);
  pointer-events: none;
}

/* ============================================================
   Nav
   ============================================================ */
.nav{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(238,240,234,0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap{
  display:flex;
  align-items:center;
  justify-content: space-between;
  height: 72px;
}
.logo{
  display:flex;
  align-items:center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.logo .mark{
  width: 30px; height:30px;
  border: 1.5px solid var(--ink);
  border-radius: 3px;
  position: relative;
  flex: none;
}
.logo .mark::before,.logo .mark::after{
  content:"";
  position:absolute;
  background: var(--accent-warm);
}
.logo .mark::before{ width:9px; height:1.5px; top:9px; left:6px; }
.logo .mark::after{ width:9px; height:1.5px; bottom:9px; right:6px; background: var(--accent); }
.logo-img{
  height: 32px;
  width: auto;
  flex: none;
  display: block;
}

.nav-links{
  display:flex;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}
.nav-links a{
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 4px;
}
.nav-links a:hover{ color: var(--ink); }
.nav-cta{
  display:flex; align-items:center; gap:1.4rem;
}
.nav-toggle{ display:none; }

.btn{
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  padding: 0.7rem 1.3rem;
  border-radius: 3px;
  border: 1px solid var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease, box-shadow .18s ease;
  cursor: pointer;
  background: transparent;
  white-space: nowrap;
}
.btn-primary{
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover{
  transform: translateY(-2px);
  box-shadow: 3px 5px 0 var(--accent-warm);
}
.btn-ghost:hover{
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-2px);
}
.btn svg{ width:14px; height:14px; flex:none; }

/* ============================================================
   Hero
   ============================================================ */
.hero{
  position: relative;
  overflow: hidden;
  padding-top: clamp(4rem, 9vw, 7rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}
.hero .wrap{ position:relative; z-index: 2; }
.hero-inner{
  max-width: 800px;
}
.hero h1{
  font-size: clamp(2.5rem, 6vw, 4.3rem);
  line-height: 1.04;
  margin-top: 1.1rem;
}
.hero .accent-word{ color: var(--accent); }
.hero p.sub{
  margin-top: 1.6rem;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--ink-soft);
  max-width: 560px;
}
.hero-ctas{
  display:flex;
  gap: 1rem;
  margin-top: 2.4rem;
  flex-wrap: wrap;
}
.hero-schematic{
  position: absolute;
  right: -40px;
  top: 90px;
  width: min(46vw, 520px);
  z-index: 1;
  opacity: 0.9;
}
@media (max-width: 900px){
  .hero-schematic{ display:none; }
}

.trust-strip{
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.7rem 0;
}
.trust-strip .wrap{
  display:flex;
  align-items:center;
  gap: 2.2rem;
  flex-wrap: wrap;
  justify-content: space-between;
}
.trust-label{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
}
.trust-logos{
  display:flex;
  gap: 2.4rem;
  flex-wrap: wrap;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink-soft);
  letter-spacing: -0.01em;
}
.trust-logos span{ opacity: 0.75; }

/* ============================================================
   About
   ============================================================ */
.about-grid{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.about-grid p{ color: var(--ink-soft); margin-top: 1.1rem; }
.about-grid p:first-of-type{ margin-top: 0.8rem; font-size: 1.15rem; color: var(--ink); }

.about-list{
  list-style:none;
  margin: 1.6rem 0 0;
  padding: 0;
  display:flex;
  flex-direction: column;
  gap: 0.9rem;
}
.about-list li{
  padding-left: 1.5rem;
  position: relative;
  color: var(--ink-soft);
}
.about-list li::before{
  content:"";
  position:absolute;
  left:0; top: 0.55em;
  width: 8px; height: 8px;
  border: 1.5px solid var(--accent);
  border-radius: 1px;
  transform: rotate(45deg);
}

.spec-card{
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.spec-card .spec-head{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0.9rem 1.3rem;
  border-bottom: 1px dashed var(--line);
  display:flex;
  justify-content: space-between;
}
.spec-row{
  display:flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.15rem 1.3rem;
  border-bottom: 1px solid var(--line);
  gap: 1rem;
}
.spec-row:last-child{ border-bottom: none; }
.spec-row .num{
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--ink);
  flex: none;
}
.spec-row .lbl{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  text-align: right;
  line-height: 1.5;
}

/* ============================================================
   Technology
   ============================================================ */
.tech-groups{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.tech-group{
  background: var(--paper-raised);
  padding: 1.6rem 1.5rem;
}
.tech-group h4{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1rem;
  font-weight: 500;
}
.tech-badges{
  display:flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tech-badge{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink-soft);
  background: var(--paper);
  white-space: nowrap;
}
@media (max-width: 900px){
  .tech-groups{ grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 560px){
  .tech-groups{ grid-template-columns: 1fr; }
}

/* ============================================================
   Case Studies
   ============================================================ */
.case-filters{
  display:flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.4rem;
}
.case-filter-btn{
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--paper-raised);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}
.case-filter-btn:hover{ border-color: var(--accent); color: var(--ink); }
.case-filter-btn.is-active{
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.case-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}
.case-card{
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color .18s ease, transform .18s ease;
}
.case-card:hover{ border-color: var(--line-strong); transform: translateY(-2px); }
.case-card[hidden]{ display:none; }

.case-cover{
  height: 128px;
  flex: none;
  position: relative;
  display:flex;
  align-items:center;
  justify-content:center;
  background:
    linear-gradient(135deg, var(--accent-soft) 0%, var(--paper) 55%, var(--accent-warm-soft) 100%);
  border-bottom: 1px solid var(--line);
}
.case-cover svg{ width: 38px; height: 38px; color: var(--accent); opacity: 0.85; }
.case-card:nth-child(3n+2) .case-cover svg{ color: var(--accent-warm); }
.case-cover::before{
  content:"";
  position:absolute; inset:0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.35;
}

.case-body{ padding: 1.4rem 1.5rem 1.6rem; display:flex; flex-direction:column; flex:1; }
.case-domain-tag{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-warm);
}
.case-title{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  margin-top: 0.5rem;
  line-height: 1.3;
}
.case-summary{
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin-top: 0.5rem;
  line-height: 1.5;
}

.case-details{ margin-top: auto; padding-top: 0.9rem; }
.case-details summary{
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  display:flex;
  align-items:center;
  gap: 0.4rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line);
}
.case-details summary::-webkit-details-marker{ display:none; }
.case-details summary::after{
  content: "+";
  margin-left: auto;
  font-size: 0.95rem;
}
.case-details[open] summary::after{ content: "–"; }
.case-detail-block{ margin-top: 0.9rem; }
.case-detail-block + .case-detail-block{ margin-top: 0.8rem; }
.case-detail-block .lbl{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display:block;
  margin-bottom: 0.3rem;
}
.case-detail-block p{
  margin:0;
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.55;
}
.case-tech{
  display:flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.9rem;
}
.case-tech span{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--ink-soft);
}

@media (max-width: 960px){
  .case-grid{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px){
  .case-grid{ grid-template-columns: 1fr; }
}

/* ============================================================
   Services
   ============================================================ */
.svc-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.svc-card{
  background: var(--paper-raised);
  padding: 2rem 1.8rem;
  transition: background 0.2s ease;
  position: relative;
}
.svc-card:hover{ background: var(--accent-soft); }
.svc-icon{
  width: 42px; height: 42px;
  color: var(--accent);
  margin-bottom: 1.3rem;
}
.svc-card:nth-child(3n+2) .svc-icon{ color: var(--accent-warm); }
.svc-card h3{
  font-size: 1.12rem;
  margin-bottom: 0.6rem;
}
.svc-card p{
  color: var(--ink-soft);
  font-size: 0.97rem;
  line-height: 1.6;
  margin:0;
}
@media (max-width: 860px){
  .svc-grid{ grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 560px){
  .svc-grid{ grid-template-columns: 1fr; }
}

/* ============================================================
   How We Work — schematic trace
   ============================================================ */
.process{
  position: relative;
}
.process-track{
  position: relative;
  display:grid;
  gap: 0;
}
.process-step{
  display:grid;
  grid-template-columns: 88px 1fr;
  gap: 1.6rem;
  padding: 2.1rem 0;
  position: relative;
  align-items: start;
}
.process-step + .process-step{ border-top: 1px dashed var(--line); }
.process-node{
  width: 60px; height: 60px;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
  background: var(--paper-raised);
  display:flex;
  align-items:center;
  justify-content:center;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  position: relative;
  z-index: 2;
  flex: none;
}
.process-step.is-visible .process-node{
  border-color: var(--accent);
  color: var(--accent);
}
.process-line{
  position: absolute;
  left: 29px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
  z-index: 1;
}
.process-line-fill{
  position:absolute;
  left:0; top:0;
  width: 100%;
  height: 0%;
  background: var(--accent);
  transition: height 1.4s cubic-bezier(.2,.7,.2,1);
}
.process-body h3{
  font-size: 1.18rem;
  display:flex;
  align-items:center;
  gap: 0.7rem;
}
.process-body h3 .tag{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-warm);
  letter-spacing: 0.1em;
}
.process-body p{
  color: var(--ink-soft);
  margin-top: 0.6rem;
  max-width: 560px;
}

/* ============================================================
   Industries
   ============================================================ */
.ind-legend{
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.ind-row{
  display:grid;
  grid-template-columns: 90px 220px 1fr;
  gap: 1.3rem;
  align-items: baseline;
  padding: 1.25rem 1.6rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper-raised);
  transition: background .18s ease;
}
.ind-row:last-child{ border-bottom: none; }
.ind-row:hover{ background: var(--accent-soft); }
.ind-code{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-warm);
  letter-spacing: 0.08em;
}
.ind-name{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.03rem;
}
.ind-desc{
  color: var(--ink-soft);
  font-size: 0.96rem;
}
@media (max-width: 700px){
  .ind-row{ grid-template-columns: 1fr; gap: 0.35rem; }
  .ind-code{ order: 1; }
  .ind-name{ order: 0; }
  .ind-desc{ order: 2; }
}

/* ============================================================
   Testimonial
   ============================================================ */
.testimonial{
  background: var(--ink);
  color: var(--paper);
  position: relative;
  overflow: hidden;
}
.testimonial .grid-bg{ opacity: 0.06; filter: invert(1); mask-image: none; }
.testimonial .wrap{ position: relative; z-index:2; max-width: 760px; text-align:center; margin: 0 auto; }
.quote-mark{
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--accent-warm);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.testimonial blockquote{
  font-family: var(--font-body);
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  line-height: 1.5;
  margin: 0;
  font-style: italic;
}
.testimonial cite{
  display:block;
  margin-top: 1.6rem;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: #A9B8B0;
  text-transform: uppercase;
}

/* ============================================================
   Why BrainerHub
   ============================================================ */
.why-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
}
.why-card{
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.7rem 1.8rem;
  background: var(--paper-raised);
}
.why-card .why-num{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.why-card h3{
  margin-top: 0.6rem;
  font-size: 1.08rem;
}
.why-card p{
  margin-top: 0.5rem;
  color: var(--ink-soft);
  font-size: 0.96rem;
}
@media (max-width: 700px){
  .why-grid{ grid-template-columns: 1fr; }
}

/* ============================================================
   Final CTA
   ============================================================ */
.cta-final{
  background: var(--ink);
  color: var(--paper);
  border-radius: 12px;
  margin: 0 var(--pad);
  padding: clamp(2.6rem, 6vw, 4.5rem);
  position: relative;
  overflow: hidden;
  text-align: center;
}
.cta-final .grid-bg{ opacity: 0.06; filter: invert(1); mask-image: none; }
.cta-final .wrap{ position: relative; z-index:2; padding:0; max-width: 620px; margin: 0 auto; }
.cta-final h2{
  color: var(--paper);
  font-size: clamp(1.9rem, 4vw, 2.7rem);
}
.cta-final p{
  color: #C7D0CA;
  margin-top: 1rem;
  font-size: 1.08rem;
}
.cta-final .hero-ctas{ justify-content: center; margin-top: 2.2rem; }
.cta-final .btn-primary{ background: var(--paper); color: var(--ink); border-color: var(--paper); }
.cta-final .btn-ghost{ border-color: #4A5A53; color: var(--paper); }
.cta-final .btn-ghost:hover{ background: var(--paper); color: var(--ink); }

/* ============================================================
   Footer
   ============================================================ */
footer{
  padding: 3rem 0 2.2rem;
  border-top: 1px solid var(--line);
}
.footer-grid{
  display:flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
}
.footer-col h4{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.9rem;
}
.footer-col a, .footer-col p{
  display:block;
  color: var(--ink-soft);
  margin: 0.45rem 0;
  font-size: 0.94rem;
}
.footer-col a:hover{ color: var(--accent); }
.footer-bottom{
  margin-top: 2.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
  display:flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-faint);
}

/* ============================================================
   Reveal-on-scroll utility
   ============================================================ */
.reveal{
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible{
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px){
  .about-grid{ grid-template-columns: 1fr; }
  .cta-final{ margin: 0 1rem; }
}
@media (max-width: 760px){
  .nav-links{ display:none; }
  .process-step{ grid-template-columns: 50px 1fr; }
  .process-node{ width:42px; height:42px; font-size:0.78rem; }
  .process-line{ left: 20px; }
}