/* =========================================================
   YAKA ENERGIES — design tokens
   bg-deep:   #0B1220   panel:    #101B2D   panel-2: #16233A
   copper:    #C97A3D   amber:    #E8A33D   line:    #223353
   text-hi:   #EDF1F7   text-lo:  #8C99B2   green:   #4FA57F
   type: IBM Plex Sans (display/body), IBM Plex Mono (labels/data)
   ========================================================= */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

:root{
  --bg-deep:#0B1220;
  --panel:#101B2D;
  --panel-2:#16233A;
  --line:#223353;
  --copper:#C97A3D;
  --amber:#E8A33D;
  --text-hi:#EDF1F7;
  --text-lo:#8C99B2;
  --green:#4FA57F;
  --radius:2px;
  --font-display:'IBM Plex Sans', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;
}

body{
  margin:0;
  background:var(--bg-deep);
  color:var(--text-hi);
  font-family:var(--font-display);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

.wrap{
  max-width:1120px;
  margin:0 auto;
  padding:0 24px;
}

/* faint blueprint grid, fixed behind everything */
.grid-overlay{
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:64px 64px;
  opacity:0.16;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 90%);
}

main, header, footer{ position:relative; z-index:1; }

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:-0.01em;
  margin:0 0 0.5em;
  color:var(--text-hi);
}
h1{ font-size:clamp(2.2rem, 5vw, 3.6rem); line-height:1.08; font-weight:700; }
h2{ font-size:clamp(1.6rem, 3vw, 2.3rem); line-height:1.15; }
h3{ font-size:1.05rem; }
p{ margin:0 0 1em; color:var(--text-lo); }
a{ color:inherit; }

.eyebrow{
  font-family:var(--font-mono);
  font-size:0.78rem;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--copper);
  margin:0 0 0.9em;
}

.accent{ color:var(--copper); }

/* ---------- header ---------- */
.site-header{
  position:sticky; top:0; z-index:20;
  background:rgba(11,18,32,0.86);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.header-row{
  display:flex; align-items:center; justify-content:space-between;
  height:72px;
}
.brand{ display:flex; align-items:center; gap:10px; text-decoration:none; }
.brand-mark{
  width:14px; height:14px;
  background:var(--copper);
  clip-path:polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  flex:none;
}
.brand-text{
  font-family:var(--font-mono);
  font-size:0.95rem;
  letter-spacing:0.06em;
  color:var(--text-hi);
}
.brand-text strong{ color:var(--copper); font-weight:600; }
.brand-text.small{ font-size:0.85rem; }

.main-nav{ display:flex; gap:32px; }
.main-nav a{
  text-decoration:none;
  color:var(--text-lo);
  font-size:0.92rem;
  transition:color .15s ease;
}
.main-nav a:hover{ color:var(--text-hi); }

.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:36px; height:36px;
  background:none; border:1px solid var(--line);
  cursor:pointer;
}
.nav-toggle span{ display:block; height:1px; background:var(--text-hi); margin:0 7px; }

/* ---------- hero ---------- */
.hero{ padding:120px 0 90px; }
.hero-inner{ max-width:760px; }
.hero-lead{ font-size:1.08rem; max-width:620px; }
.hero-actions{ display:flex; gap:16px; margin-top:36px; flex-wrap:wrap; }

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:13px 26px;
  font-family:var(--font-mono);
  font-size:0.85rem;
  letter-spacing:0.04em;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:var(--radius);
  cursor:pointer;
  transition:all .15s ease;
}
.btn-primary{ background:var(--copper); color:#0B1220; font-weight:600; }
.btn-primary:hover{ background:var(--amber); }
.btn-ghost{ border-color:var(--line); color:var(--text-hi); background:transparent; }
.btn-ghost:hover{ border-color:var(--copper); color:var(--copper); }

/* ---------- chain diagram (signature element) ---------- */
.chain-section{ padding:40px 0 100px; }
.section-lead{ max-width:620px; }

.chain-diagram{
  margin-top:56px;
  padding:48px 24px 32px;
  overflow-x:auto;
}
.chain-track{
  position:relative;
  display:flex;
  justify-content:space-between;
  min-width:720px;
  max-width:1080px;
  margin:0 auto;
  padding:0 20px;
}
.chain-line{
  position:absolute;
  left:20px; right:20px; top:9px;
  height:1px;
  background:var(--line);
}
.chain-pulse{
  position:absolute;
  top:5px; left:20px;
  width:9px; height:9px;
  border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 12px 2px rgba(232,163,61,0.7);
  animation:pulse-travel 6s linear infinite;
}
@keyframes pulse-travel{
  0%{ left:20px; opacity:0; }
  5%{ opacity:1; }
  95%{ opacity:1; }
  100%{ left:calc(100% - 29px); opacity:0; }
}
.chain-node{
  position:relative;
  display:flex; flex-direction:column; align-items:center;
  gap:14px;
  width:100px;
}
.node-dot{
  width:9px; height:9px;
  border-radius:50%;
  background:var(--bg-deep);
  border:1px solid var(--copper);
  z-index:2;
}
.node-label{
  font-family:var(--font-mono);
  font-size:0.72rem;
  letter-spacing:0.04em;
  text-align:center;
  color:var(--text-lo);
  line-height:1.4;
}

@media (prefers-reduced-motion: reduce){
  .chain-pulse{ animation:none; opacity:0.8; }
}

/* ---------- expertise cards ---------- */
.expertise{ padding:40px 0 110px; }
.card-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--line);
  margin-top:48px;
  border:1px solid var(--line);
}
.card{
  background:var(--panel);
  padding:32px 28px;
  transition:background .15s ease;
}
.card:hover{ background:var(--panel-2); }
.card-tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:0.7rem;
  letter-spacing:0.1em;
  color:var(--amber);
  border:1px solid var(--line);
  padding:3px 8px;
  margin-bottom:16px;
}
.card p{ margin-bottom:0; font-size:0.94rem; }

/* ---------- founder ---------- */
.founder{ padding:40px 0 110px; }
.founder-grid{
  display:grid;
  grid-template-columns:280px 1fr;
  gap:64px;
  align-items:start;
}
.founder-frame{
  border:1px solid var(--line);
  background:var(--panel);
  aspect-ratio:1/1.1;
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  text-align:center;
  padding:24px;
  position:relative;
}
.founder-frame::before,
.founder-frame::after{
  content:"";
  position:absolute;
  width:16px; height:16px;
  border:1px solid var(--copper);
}
.founder-frame::before{ top:-1px; left:-1px; border-right:none; border-bottom:none; }
.founder-frame::after{ bottom:-1px; right:-1px; border-left:none; border-top:none; }
.founder-initials{
  font-family:var(--font-mono);
  font-size:3.4rem;
  font-weight:600;
  color:var(--copper);
  line-height:1;
}
.founder-caption{
  font-family:var(--font-mono);
  font-size:0.78rem;
  color:var(--text-lo);
  margin-top:16px;
  letter-spacing:0.03em;
}
.founder-text p{ font-size:0.98rem; }

/* ---------- contact ---------- */
.contact{ padding:40px 0 120px; }
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:64px;
  align-items:start;
}
.contact-list{ list-style:none; padding:0; margin:32px 0 0; border-top:1px solid var(--line); }
.contact-list li{
  display:flex; justify-content:space-between; align-items:baseline;
  padding:16px 0;
  border-bottom:1px solid var(--line);
  font-size:0.95rem;
}
.contact-list li span{
  font-family:var(--font-mono);
  font-size:0.75rem;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--text-lo);
}
.contact-list li a{ text-decoration:none; color:var(--text-hi); }
.contact-note{ font-family:var(--font-mono); font-size:0.75rem; color:var(--text-lo); margin-top:20px; }

.contact-form{ display:flex; flex-direction:column; gap:8px; }
.contact-form label{
  font-family:var(--font-mono);
  font-size:0.75rem;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--text-lo);
  margin-top:16px;
}
.contact-form input, .contact-form textarea{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  color:var(--text-hi);
  font-family:var(--font-display);
  font-size:0.95rem;
  padding:12px 14px;
  resize:vertical;
}
.contact-form input:focus, .contact-form textarea:focus{
  outline:2px solid var(--copper);
  outline-offset:1px;
}
.contact-form .btn{ margin-top:20px; align-self:flex-start; }
.form-note{ font-family:var(--font-mono); font-size:0.72rem; color:var(--text-lo); margin-top:10px; }

/* ---------- footer ---------- */
.site-footer{ border-top:1px solid var(--line); padding:28px 0; }
.footer-row{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; }
.footer-copy{ font-family:var(--font-mono); font-size:0.75rem; color:var(--text-lo); }

/* ---------- focus visibility ---------- */
a:focus-visible, button:focus-visible{
  outline:2px solid var(--copper);
  outline-offset:2px;
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .card-grid{ grid-template-columns:repeat(2,1fr); }
  .founder-grid{ grid-template-columns:1fr; }
  .founder-frame{ max-width:220px; }
  .contact-grid{ grid-template-columns:1fr; gap:40px; }
}

@media (max-width:720px){
  .main-nav{
    position:absolute; top:72px; left:0; right:0;
    background:var(--bg-deep);
    border-bottom:1px solid var(--line);
    flex-direction:column; gap:0;
    max-height:0; overflow:hidden;
  }
  .main-nav.open{ max-height:300px; }
  .main-nav a{ padding:16px 24px; border-top:1px solid var(--line); }
  .nav-toggle{ display:flex; }
  .card-grid{ grid-template-columns:1fr; }
  .hero{ padding:90px 0 60px; }
}