/* NektronAI — Minimal Research/Engineering Theme
   Drop-in static site styling (no build step).
   Designed for a technical audience: calm, high-contrast, and readable.
*/

:root{
  /* Dark theme (default) — brand-aligned “Deep Ocean” palette */
  --bg: #050910;
  --bg2:#06121a;
  --panel: rgba(255,255,255,.055);
  --panel2: rgba(255,255,255,.032);
  --text:#eaf0ff;
  --muted:#aeb8cc;
  --muted2:#8791a8;
  --border: rgba(255,255,255,.14);
  --border2: rgba(255,255,255,.085);

  --accent:#5ec8ff;
  --accent2:#ff9a34;
  --accent-border: rgba(94,200,255,.36);

  --good:#9ece6a;
  --warn:#e0af68;

  --header-bg: rgba(5, 9, 16, .56);
  --callout-border: rgba(255, 183, 115, .34);
  --callout-bg: linear-gradient(180deg, rgba(255, 183, 115, .12), rgba(255, 183, 115, .05));
  --primary-grad: linear-gradient(135deg, rgba(94,200,255,.28), rgba(255,154,52,.16));

  --max: 1120px;
  --radius: 16px;
  --radius-sm: 12px;

  --shadow: 0 18px 40px rgba(0,0,0,.40);

  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --step--1: clamp(.92rem, .90rem + .08vw, .98rem);
  --step-0: clamp(1.03rem, 1.00rem + .14vw, 1.12rem);
  --step-1: clamp(1.20rem, 1.14rem + .28vw, 1.35rem);
  --step-2: clamp(1.45rem, 1.34rem + .55vw, 1.80rem);
  --step-3: clamp(1.85rem, 1.62rem + 1.15vw, 2.55rem);
  --step-4: clamp(2.30rem, 1.98rem + 1.60vw, 3.35rem);

  --space-1: .5rem;
  --space-2: .8rem;
  --space-3: 1.1rem;
  --space-4: 1.6rem;
  --space-5: 2.2rem;
  --space-6: 3.0rem;
  --space-7: 4.0rem;
  --space-8: 5.2rem;

  color-scheme: dark;
}


/* Optional light theme */
.theme-light{
  --bg:#fbfbfd;
  --bg2:#f3f4f6;
  --panel: rgba(0,0,0,.035);
  --panel2: rgba(0,0,0,.02);
  --text:#0b1220;
  --muted:#3b4452;
  --muted2:#556070;
  --border: rgba(0,0,0,.14);
  --border2: rgba(0,0,0,.08);

  --accent:#006a8a;
  --accent2:#b45309;
  --accent-border: rgba(0, 106, 138, .32);

  --shadow: 0 18px 40px rgba(0,0,0,.12);

  --header-bg: rgba(251, 251, 253, .66);
  --callout-border: rgba(180, 83, 9, .22);
  --callout-bg: linear-gradient(180deg, rgba(180, 83, 9, .10), rgba(180, 83, 9, .04));

  --primary-grad: linear-gradient(135deg, rgba(0,106,138,.20), rgba(180,83,9,.12));

  color-scheme: light;
}


*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: var(--font-sans);
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(5,9,16,.46), rgba(5,9,16,.46)),
    url("background_dark.jpg") left top / 2500px auto repeat,
    linear-gradient(180deg, var(--bg), var(--bg2));
  background-attachment: fixed, fixed, fixed;
  line-height:1.55;
}

.theme-light body{
  background:
    linear-gradient(180deg, rgba(251,251,253,.62), rgba(251,251,253,.62)),
    url("background_light.jpg") left top / 2500px auto repeat,
    linear-gradient(180deg, var(--bg), var(--bg2));
  background-attachment: fixed, fixed, fixed;
}


a{
  color: var(--accent);
  text-decoration: none;
}

a:hover{ color: var(--text); }

p{ margin: 0 0 var(--space-3); color: var(--muted); font-size: var(--step-0); }

small{ font-size: var(--step--1); color: var(--muted2); }

code, pre{ font-family: var(--font-mono); }

.container{
  width: min(var(--max), calc(100% - 2*var(--space-4)));
  margin: 0 auto;
}

.skip-link{
  position:absolute;
  left:-999px;
  top:0;
  padding:.65rem 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  z-index: 9999;
}
.skip-link:focus{ left: var(--space-4); top: var(--space-4); }

header{
  position: sticky;
  top:0;
  z-index:100;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border2);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
}

.brand{
  display:flex;
  align-items:center;
  gap:.7rem;
  font-weight: 650;
  letter-spacing: .2px;
}
.brand-mark{
  display:flex;
  align-items:center;
  justify-content:center;
  width:auto;
  height: auto;
}
.brand-wordmark{
  display:block;
  width: min(320px, 58vw);
  height:auto;
  max-width: 100%;
}
.brand-wordmark-dark{ display:block; }
.brand-wordmark-light{ display:none; }

.theme-light .brand-wordmark-dark{ display:none; }
.theme-light .brand-wordmark-light{ display:block; }
.brand-name{ display:none; }

@media (max-width: 600px){
  .brand-wordmark{ width: min(220px, 74vw); }
}

nav{
  display:flex;
  align-items:center;
  gap: .9rem;
  flex-wrap: wrap;
}

nav a{
  font-size: .96rem;
  color: var(--muted);
  padding: .4rem .55rem;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
nav a:hover{
  color: var(--text);
  border-color: var(--border2);
  background: var(--panel2);
}
nav a.active{
  color: var(--text);
  border-color: var(--border);
  background: var(--panel);
}

.nav-actions{
  display:flex;
  align-items:center;
  gap:.6rem;
}

.icon-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  border: 1px solid var(--border2);
  background: var(--panel2);
  color: var(--muted);
  border-radius: 12px;
  padding: .55rem .7rem;
  cursor:pointer;
  transition: transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.icon-btn:hover{
  color: var(--text);
  border-color: var(--border);
  background: var(--panel);
}
.icon-btn svg{ width: 16px; height:16px; opacity:.9; }
.icon-btn-label{ font-size:.95rem; }

.nav-toggle{
  display:none;
}

header.nav-open .nav-toggle{
  background: var(--panel);
  border-color: var(--border);
  color: var(--text);
}

@media (max-width: 1080px){
  .icon-btn{
    padding:.55rem;
  }
  .icon-btn-label{
    display:none;
  }
}

@media (max-width: 860px){
  nav{ display:none; }
  .nav-toggle{ display:inline-flex; }
  header.nav-open nav{
    display:flex;
    flex-direction:column;
    align-items:flex-start;
    width:100%;
    padding: 0 0 var(--space-3) 0;
  }
  .header-inner{ flex-wrap: wrap; }
  .nav-actions{ margin-left:auto; }
}

main{ padding: var(--space-5) 0 var(--space-8); }

/* Sticky-header anchor offset */
section[id]{ scroll-margin-top: 96px; }

.hero{
  padding: var(--space-7) 0 var(--space-7);
}

.hero-compact{
  padding-bottom: var(--space-5);
}

.kicker{
  font-family: var(--font-mono);
  color: var(--muted2);
  font-size: .86rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

h1{
  margin:0 0 var(--space-3);
  font-size: var(--step-4);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero p{
  font-size: var(--step-1);
  color: var(--muted);
  max-width: 60ch;
}

.hero-cta{
  display:flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: var(--space-4);
}

.button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  padding: .78rem 1.05rem;
  border-radius: 14px;
  border: 1px solid var(--border2);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease, box-shadow .15s ease;
}
.button:hover{
  border-color: var(--border);
  transform: translateY(-1px);
}
.button:active{ transform: translateY(0); }

.button.primary{
  background: var(--primary-grad);
  border-color: var(--accent-border);
}

.button.secondary{
  background: transparent;
  box-shadow:none;
}

.button svg{ width: 16px; height:16px; opacity:.95; }

.meta-row{
  display:flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: var(--space-4);
  color: var(--muted2);
  font-size: .95rem;
}
.meta-pill{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding: .45rem .7rem;
  border-radius: 999px;
  border: 1px solid var(--border2);
  background: var(--panel2);
}
.meta-pill code{ font-size: .88rem; color: var(--text); }

.section{
  padding: var(--space-7) 0;
  border-top: 1px solid var(--border2);
}

.section-tight-top{
  padding-top: var(--space-5);
}

.section h2{
  margin:0 0 var(--space-3);
  font-size: var(--step-2);
  letter-spacing: -0.01em;
}

.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.section-head p{ max-width: 70ch; margin:0; }

#about .section-head{
  margin-bottom: var(--space-5);
}

#about .section-head > div{
  max-width: 84ch;
}

#about .section-head p{
  max-width: 78ch;
  line-height: 1.68;
}

#about .section-head p + p{
  margin-top: .9rem;
}

#about #about .card{
  padding: clamp(1.35rem, 1.2rem + 0.4vw, 1.8rem);
}

.grid{
  display:grid;
  gap: var(--space-4);
  width: 100%;
}

.grid.cols-3{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-2{ grid-template-columns: repeat(2, minmax(0, 1fr)); }

@media (max-width: 980px){
  .grid.cols-3{ grid-template-columns: 1fr; }
  .grid.cols-2{ grid-template-columns: 1fr; }
}

.card{
  padding: var(--space-4);
  border-radius: var(--radius);
  border: 1px solid var(--border2);
  background: linear-gradient(180deg, var(--panel), var(--panel2));
  box-shadow: var(--shadow);
}

.card h3{
  margin:0 0 .55rem;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.card p{ margin:0 0 0; }

.leader-layout{
  display: grid;
  grid-template-columns: 196px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
}

.leader-profile{
  margin: 0;
}

.leader-portrait{
  display: block;
  width: 196px;
  max-width: none;
  height: 244px;
  object-fit: cover;
  object-position: center 14%;
  border-radius: 12px;
  border: 1px solid var(--border2);
  box-shadow: 0 10px 18px rgba(0,0,0,.22);
}

.leader-copy p{
  margin: 0;
  max-width: 66ch;
  line-height: 1.68;
  color: var(--text);
  opacity: .92;
}
.leader-copy p + p{ margin-top: .9rem; }

.card .tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  margin-top: var(--space-3);
  color: var(--muted2);
  font-family: var(--font-mono);
  font-size: .84rem;
}

@media (max-width: 760px){
  #about .section-head{
    margin-bottom: var(--space-4);
  }

  #about .section-head p + p{
    margin-top: .8rem;
  }

  #about .grid{
    max-width: 100%;
    gap: var(--space-3);
  }

  .leader-layout{
    grid-template-columns: 1fr;
  }

  .leader-profile{
    display: flex;
    justify-content: flex-start;
  }

  .leader-portrait{
    width: 172px;
    height: 214px;
  }
}

.list{
  margin: var(--space-3) 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
}
.list li{ margin: .4rem 0; }

.callout{
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius);
  border: 1px solid var(--callout-border);
  background: var(--callout-bg);
  color: var(--text);
}
.callout strong{ font-weight: 700; }
.callout p{ margin: .4rem 0 0; color: var(--muted); }

.quote{
  margin: var(--space-4) 0 0;
  padding: var(--space-4);
  border-radius: var(--radius);
  border: 1px solid var(--border2);
  background: var(--panel2);
}
.quote p{ margin:0; color: var(--text); font-size: var(--step-0); }
.quote footer{ margin-top: var(--space-2); color: var(--muted2); font-family: var(--font-mono); font-size: .88rem; }

.footer{
  border-top: 1px solid var(--border2);
  padding: var(--space-6) 0;
  color: var(--muted);
}
.footer-brand{ margin-bottom:.6rem; }
.footer-brand .brand-wordmark{
  width: min(280px, 52vw);
}
.footer-links{
  display:grid;
  gap:.4rem;
}
.footer-grid{
  display:grid;
  gap: var(--space-4);
  grid-template-columns: 2fr 1fr 1fr;
}
@media (max-width: 900px){
  .footer-grid{ grid-template-columns: 1fr; }
  .footer-brand .brand-wordmark{
    width: min(210px, 70vw);
  }
}

.footer a{ color: var(--muted); }
.footer a:hover{ color: var(--text); }

.footer h4{
  margin: 0 0 .8rem;
  font-size: .98rem;
  color: var(--text);
}

hr.soft{
  border:0;
  border-top:1px solid var(--border2);
  margin: var(--space-4) 0;
}

.page-title{
  margin:0 0 var(--space-3);
  font-size: var(--step-3);
}

.prose{
  max-width: 80ch;
}
.prose h2{ margin-top: var(--space-6); }
.prose h3{ margin-top: var(--space-5); }
.prose ul{ margin: var(--space-3) 0; }
.prose li{ margin: .45rem 0; color: var(--muted); }

/* Focus styles */
:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 10px;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ transition:none !important; }
  .button:hover{ transform:none; }
}