:root{
  --bg:#f6f8fb;
  --bg2:#eef2f7;
  --text:#1d2430;
  --muted:#5a6678;

  --line:rgba(20,28,40,.12);
  --line-soft:rgba(20,28,40,.08);

  --card:rgba(255,255,255,.94);
  --shadow:0 12px 36px rgba(16,24,40,.06);

  --radius:18px;
  --max:1320px;

  --accent:rgba(70,120,210,.22);
  --focus:rgba(70,120,210,.45);

  /* premium helpers */
  --ink: rgba(29,36,48,.92);
  --ink2: rgba(29,36,48,.78);
  --ink3: rgba(29,36,48,.62);
  --glass: rgba(255,255,255,.76);
  --paper: rgba(255,255,255,.92);
  --elev: 0 24px 80px rgba(16,24,40,.10);
}

/* ===== Base ===== */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  color:var(--text);
  background: radial-gradient(900px 500px at 70% 20%,#fff 0%,var(--bg) 60%,var(--bg2) 100%);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
.container{
  width:min(var(--max),calc(100% - 40px));
  margin:0 auto;
}

/* ===== Focus ===== */
:where(a,button,summary,input,textarea,select):focus-visible{
  outline:3px solid var(--focus);
  outline-offset:2px;
  border-radius:12px;
}

/* ===== Accessibility ===== */
.skip-link{
  position:absolute;
  left:-999px;
  top:10px;
  padding:10px 12px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:10px;
  z-index:9999;
}
.skip-link:focus{left:10px}

/* ===== Header / Nav ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter:blur(12px);
  background:rgba(246,248,251,.78);
  border-bottom:1px solid var(--line);
}

.nav{
  width:min(var(--max),calc(100% - 40px));
  margin:0 auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:14px 0;
}

.nav__left{display:flex;align-items:center}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-weight:700;
  letter-spacing:.2px;
}

/* jei LT span vis dar yra HTML'e, gali paslėpti čia */
.brand__mark{ display:none; }

.brand__text{font-size:16px}

/* ===== Mobile toggle ===== */
.nav__toggle{
  display:none;
  border:1px solid var(--line);
  background:#fff;
  border-radius:12px;
  width:44px;height:44px;
  cursor:pointer;
}
.nav__toggle-bars{
  display:block;
  width:18px;height:2px;
  background:var(--text);
  margin:0 auto;
  position:relative;
}
.nav__toggle-bars::before,
.nav__toggle-bars::after{
  content:"";
  position:absolute;left:0;
  width:18px;height:2px;
  background:var(--text);
}
.nav__toggle-bars::before{top:-6px}
.nav__toggle-bars::after{top:6px}

/* Nav: horizontal scroll on desktop if many links */
.nav__menu{
  display:flex;
  align-items:center;
  gap:8px;
  overflow-x:auto;
  overflow-y:hidden;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:none;
  padding:2px 2px;
}
.nav__menu::-webkit-scrollbar{display:none}
.nav__menu a{flex:0 0 auto}

.nav__link{
  font-size:14px;
  padding:10px 12px;
  border-radius:12px;
  color:rgba(29,36,48,.78);
  border:1px solid transparent;
  transition:background .15s ease,border-color .15s ease,color .15s ease, transform .15s ease;
  white-space:nowrap;
}
.nav__link:hover{
  background:rgba(255,255,255,.82);
  color:var(--text);
  transform: translateY(-1px);
}
.nav__link.is-active{
  background:#fff;
  border-color:var(--line);
  box-shadow:var(--shadow);
  color:var(--text);
}
.nav__link--cta{
  border:1px solid var(--line);
  background:#fff;
}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:14px 26px;
  border-radius:999px;
  border:1px solid rgba(29,36,48,.18);
  background:rgba(255,255,255,.90);
  box-shadow:0 18px 50px rgba(16,24,40,.10);
  font-weight:600;
  transition:transform .15s ease, background .15s ease, box-shadow .15s ease;
}
.btn:hover{
  transform:translateY(-1px);
  background:rgba(255,255,255,.96);
  box-shadow:0 22px 60px rgba(16,24,40,.14);
}
.btn:active{transform:translateY(0)}
.btn--primary{border-color: rgba(70,120,210,.30);}

/* ======================================================
   HOME HERO — isolated (does NOT affect other pages)
====================================================== */
.home-hero{
  position: relative;
  min-height: calc(100svh - 72px);
  overflow: hidden;
  background:#000;
}

.home-hero__video{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:50% 50%;
}

.home-hero::after{
  content:"";
  position:absolute;
  inset:0;
  background: linear-gradient(
    180deg,
    rgba(0,0,0,.18) 0%,
    rgba(0,0,0,.10) 45%,
    rgba(0,0,0,.45) 100%
  );
  pointer-events:none;
}

.home-hero__card{
  position:absolute;
  left:50%;
  bottom:28px;
  transform:translateX(-50%);
  z-index:2;

  width:min(980px, calc(100% - 32px));
  padding:22px 24px;

  background: rgba(255,255,255,.92);
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 22px;
  box-shadow: 0 30px 90px rgba(0,0,0,.22);
  backdrop-filter: blur(10px);

  animation: homeCardIn .5s ease-out both;
}
@keyframes homeCardIn{
  from{ transform:translateX(-50%) translateY(10px); opacity:0; }
  to{ transform:translateX(-50%) translateY(0); opacity:1; }
}

.home-hero__card h1{
  margin:0 0 10px;
  font-size:24px;
  letter-spacing:.01em;
  color:#1f2a3a;
}
.home-hero__card p{
  margin:0 0 14px;
  font-size:16px;
  line-height:1.75;
  color: rgba(29,36,48,.78);
  text-align:justify;
  text-justify:inter-word;
  hyphens:auto;
}

/* ======================================================
   INNER PAGES — premium scientific
====================================================== */

/* Page hero (base) */
.page-hero{
  padding: 44px 0 26px;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(255,255,255,.62), rgba(255,255,255,0));
}
.page-hero__inner{
  width:min(var(--max),calc(100% - 40px));
  margin:0 auto;
  padding-left:18px;
  position:relative;
}
.page-hero__inner::before{
  content:"";
  position:absolute;
  left:0; top:12px; bottom:12px;
  width:3px;
  border-radius:999px;
  background: var(--accent);
}
.page-hero h1{
  margin:0 0 10px;
  font-size: clamp(34px, 4vw, 56px);
  letter-spacing:.01em;
  line-height:1.08;
  color: rgba(29,36,48,.94);
}
.page-hero p{
  margin:0;
  max-width: 95ch;
  color: rgba(29,36,48,.72);
  line-height: 1.75;
  font-size: 16px;
}

/* Premium variant */
.page-hero--premium{
  position: relative;
  overflow:hidden;
}
.page-hero__eyebrow{
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: rgba(29,36,48,.60);
}
.page-hero__lead{
  font-size: 16px;
  line-height: 1.75;
  color: rgba(29,36,48,.72);
  max-width: 95ch;
}
.page-hero__chips{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top: 16px;
}
.chip{
  display:inline-flex;
  align-items:center;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(20,28,40,.10);
  background: rgba(255,255,255,.78);
  box-shadow: 0 10px 26px rgba(16,24,40,.05);
  font-size: 13px;
  color: rgba(29,36,48,.72);
}
.page-hero__ornament{
  position:absolute;
  right:-160px;
  top:-160px;
  width: 560px;
  height: 560px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 40% 40%, rgba(70,120,210,.20), rgba(255,255,255,0) 62%),
    radial-gradient(circle at 60% 65%, rgba(120,200,255,.18), rgba(255,255,255,0) 58%);
  filter: blur(1px);
  opacity: .9;
  pointer-events:none;
  transform: rotate(10deg);
}

/* Page content */
.page-content{
  padding: 34px 0 90px;
  background: rgba(255,255,255,.30);
}

/* Card (default) */
.card{
  background: var(--card);
  border: 1px solid rgba(20,28,40,.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px;
}

/* Card variants */
.card--paper{
  background: var(--paper);
  border: 1px solid rgba(20,28,40,.12);
  box-shadow: var(--elev);
}
.card--glass{
  background: var(--glass);
  border: 1px solid rgba(255,255,255,.55);
  box-shadow: var(--elev);
  backdrop-filter: blur(12px);
}

/* Typography (Prose) */
.prose{
  max-width: 105ch;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.9;
  color: rgba(29,36,48,.90);
}
.prose p{
  margin: 0 0 16px;
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
}
.prose h2{
  margin: 42px 0 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 26px;
  letter-spacing: .01em;
  color: rgba(29,36,48,.92);
  scroll-margin-top: 96px;
}
.prose h2:first-of-type{
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}
.prose hr{
  border: 0;
  border-top: 1px solid var(--line-soft);
  margin: 32px 0;
}
.small{
  font-size: 13px;
  color: rgba(29,36,48,.72);
  line-height: 1.6;
}

/* Figures */
.figure{
  max-width: 105ch;
  margin: 22px auto;
  border: 1px solid rgba(20,28,40,.12);
  border-radius: 18px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 18px 60px rgba(16,24,40,.08);
}
.figure img{ width:100%; }
.figure__cap{
  padding: 10px 14px;
  font-size: 13px;
  color: rgba(29,36,48,.70);
  border-top: 1px solid var(--line-soft);
  line-height: 1.55;
}
.figure--wide{ max-width: 1200px; }

/* 3D lift option */
.figure--lift{
  transform: translateZ(0);
  box-shadow: 0 26px 90px rgba(16,24,40,.12);
}
.figure--lift img{ transform: translateZ(0); }

/* Layout with sticky toc */
.layout{ display:grid; gap:18px; }
.layout--toc{
  grid-template-columns: 1fr 320px;
  align-items: start;
}
@media (max-width: 1100px){
  .layout--toc{ grid-template-columns: 1fr; }
}

/* TOC */
.toc__card{
  position: sticky;
  top: 92px;
  padding: 18px;
}
.toc__title{
  font-weight: 700;
  letter-spacing: .01em;
  margin-bottom: 10px;
  color: rgba(29,36,48,.92);
}
.toc__nav{
  display:grid;
  gap: 8px;
  margin-bottom: 14px;
}
.toc__nav a{
  padding: 10px 10px;
  border-radius: 12px;
  border: 1px solid rgba(20,28,40,.08);
  background: rgba(255,255,255,.60);
  color: rgba(29,36,48,.78);
  transition: transform .15s ease, background .15s ease;
}
.toc__nav a:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.85);
}
.toc__cta{
  display:grid;
  gap:10px;
  margin-top:10px;
}
.toc__note{ margin-top: 12px; }

/* ===== Footer ===== */
.footer{
  border-top:1px solid var(--line);
  background:rgba(246,248,251,.78);
  padding:26px 0;
}
.footer__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  color:rgba(29,36,48,.7);
  font-size:14px;
}
.footer__link{
  padding:8px 10px;
  border-radius:12px;
}
.footer__link:hover{background:rgba(255,255,255,.82)}

/* ===== Mobile ===== */
@media(max-width:980px){
  .nav__toggle{display:inline-flex;align-items:center;justify-content:center}

  .nav__menu{
    position:absolute;
    left:20px;right:20px;top:70px;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:6px;
    padding:12px;
    border:1px solid var(--line);
    border-radius:16px;
    background:#fff;
    box-shadow:0 18px 60px rgba(16,24,40,.10);
    overflow:hidden;
  }
  .nav__menu.is-open{display:flex}
  .nav__link{padding:12px 12px}
  .nav__link--cta{text-align:center}

  .home-hero__card{
    bottom:18px;
    padding:18px 18px;
    border-radius:18px;
  }
  .home-hero__card h1{font-size:20px}
  .home-hero__card p{font-size:15px}

  .card{ padding: 24px; }
  .toc__card{ position: static; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .home-hero__card{animation:none}
}
/* =========================================================
   PREMIUM SCIENTIFIC PAGES — polished, 3D, “luxury science”
   (does NOT touch .home-hero)
========================================================= */

/* Subtle page background texture (inner pages only) */
.page-content{
  background:
    radial-gradient(900px 420px at 18% 10%, rgba(70,120,210,.10), rgba(255,255,255,0) 55%),
    radial-gradient(900px 520px at 86% 30%, rgba(120,200,255,.09), rgba(255,255,255,0) 58%),
    linear-gradient(180deg, rgba(255,255,255,.28), rgba(255,255,255,.18));
}

/* Make hero feel “premium” and less flat */
.page-hero.page-hero--premium{
  background:
    radial-gradient(720px 420px at 18% 40%, rgba(70,120,210,.14), rgba(255,255,255,0) 60%),
    linear-gradient(180deg, rgba(255,255,255,.70), rgba(255,255,255,0));
  border-bottom: 1px solid rgba(20,28,40,.10);
}

/* Reduce ornament dominance (often the reason it looks “cheap”) */
.page-hero__ornament{
  opacity: .55;
  filter: blur(2px);
  right: -220px;
  top: -220px;
  width: 620px;
  height: 620px;
}

/* Hero inner spacing */
.page-hero__inner{
  padding-left: 18px;
  padding-top: 6px;
  padding-bottom: 10px;
}

/* Eyebrow + lead: more “journal” */
.page-hero__eyebrow{
  font-weight: 600;
  color: rgba(29,36,48,.58);
}
.page-hero__lead{
  font-size: 16px;
  line-height: 1.75;
  color: rgba(29,36,48,.74);
}

/* Chips: more refined */
.chip{
  background: rgba(255,255,255,.86);
  border: 1px solid rgba(20,28,40,.10);
  box-shadow: 0 14px 40px rgba(16,24,40,.06);
}

/* ===== Layout: content + sticky toc ===== */
.layout--toc{
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 18px;
}

@media (max-width: 1180px){
  .layout--toc{
    grid-template-columns: 1fr;
  }
}

/* ===== Main article card: real “paper” feel ===== */
.card.card--paper{
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(20,28,40,.12);
  box-shadow:
    0 22px 70px rgba(16,24,40,.10),
    0 2px 0 rgba(255,255,255,.65) inset;
  border-radius: 22px;
  padding: 38px;
}

/* Prose tuning (more premium readable rhythm) */
.prose{
  font-size: 17px;
  line-height: 1.95;
  color: rgba(29,36,48,.90);
}
.prose p{
  margin: 0 0 16px;
}
.prose h2{
  margin: 44px 0 12px;
  padding-top: 18px;
  border-top: 1px solid rgba(20,28,40,.08);
  font-size: 26px;
  letter-spacing: .01em;
}
.prose hr{
  margin: 34px 0;
  border-top: 1px solid rgba(20,28,40,.08);
}

/* Give headings a cleaner “academic” tone */
.prose h2{
  color: rgba(29,36,48,.92);
}

/* ===== Figures: consistent 3D “lift” ===== */
.figure{
  border-radius: 20px;
  border: 1px solid rgba(20,28,40,.10);
  background: rgba(255,255,255,.98);
  box-shadow:
    0 26px 90px rgba(16,24,40,.12),
    0 1px 0 rgba(255,255,255,.75) inset;
  overflow: hidden;
}

.figure img{
  transform: translateZ(0);
}

.figure__cap{
  padding: 12px 14px;
  font-size: 13px;
  color: rgba(29,36,48,.70);
  background: rgba(255,255,255,.92);
}

/* Wide figures should feel intentional */
.figure--wide{
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== TOC (right side) ===== */
.card.card--glass.toc__card{
  background: rgba(255,255,255,.72);
  border: 1px solid rgba(255,255,255,.55);
  box-shadow: 0 28px 90px rgba(16,24,40,.12);
  border-radius: 22px;
  backdrop-filter: blur(14px);
}

.toc__title{
  font-size: 14px;
  letter-spacing: .02em;
  color: rgba(29,36,48,.92);
}

.toc__nav a{
  background: rgba(255,255,255,.68);
  border: 1px solid rgba(20,28,40,.08);
  box-shadow: 0 10px 26px rgba(16,24,40,.06);
}
.toc__nav a:hover{
  background: rgba(255,255,255,.90);
}

/* Make sticky feel correct below header */
.toc__card{
  top: 88px; /* header height zone */
}

/* Buttons inside TOC: more premium */
.toc__cta .btn{
  width: 100%;
  justify-content: center;
}

/* Mobile: reduce padding, keep premium */
@media (max-width: 980px){
  .card.card--paper{
    padding: 26px;
    border-radius: 20px;
  }
  .card.card--glass.toc__card{
    border-radius: 20px;
  }
}