/* =========================
   BIO + CHEMISTRY PREMIUM BACKGROUND
   (DNA + molecules + bonds + lab grid)
   ========================= */

/* ====== UPDATED VARIABLES (Bio Lab) ====== */
:root{
  --radius: 26px;

  /* Light (Bio + Chem Lab) */
  --l-bg:  #f4fbff;
  --l-bg2: #f2fff8;
  --l-card:#ffffff;
  --l-text:#0f172a;
  --l-muted:#64748b;
  --l-stroke: rgba(15,23,42,.10);
  --l-shadow: 0 18px 60px rgba(15,23,42,.10);

  --l-labA: rgba(34,211,238,.18);  /* cyan */
  --l-labB: rgba(59,130,246,.16);  /* blue */
  --l-labC: rgba(168,85,247,.14);  /* purple */
  --l-bioG: rgba(34,197,94,.12);   /* green bio */

  /* Dark (Bio + Chem Neon Lab) */
  --d-bg:#050713;
  --d-bg2:#040815;
  --d-card: rgba(10,14,28,.55);
  --d-text:#eef2ff;
  --d-muted: rgba(238,242,255,.68);
  --d-stroke: rgba(255,255,255,.12);
  --d-shadow: 0 22px 90px rgba(0,0,0,.55);

  --d-labA: rgba(34,211,238,.14);
  --d-labB: rgba(59,130,246,.12);
  --d-labC: rgba(168,85,247,.12);
  --d-bioG: rgba(34,197,94,.10);

  /* Accents */
  --cyan:#22d3ee;
  --blue:#3b82f6;
  --purple:#a855f7;
  --pink:#ff4fd8;
  --gold:#fbbf24;
  --bio:#22c55e;
}

*{ box-sizing:border-box; }
html, body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  overflow-x:hidden;
}

/* -------------------------
   THEME CLASSES (UPDATED BACKGROUND)
--------------------------*/
body.theme-light{
  color: var(--l-text);
  background:
    radial-gradient(900px 520px at 78% 12%, var(--l-labB), transparent 58%),
    radial-gradient(900px 520px at 16% 40%, var(--l-labC), transparent 58%),
    radial-gradient(900px 520px at 70% 88%, var(--l-labA), transparent 60%),
    radial-gradient(760px 420px at 30% 78%, var(--l-bioG), transparent 60%),
    linear-gradient(180deg, var(--l-bg), var(--l-bg2));
}
body.theme-dark{
  color: var(--d-text);
  background:
    radial-gradient(1000px 650px at 20% 22%, var(--d-labA), transparent 58%),
    radial-gradient(980px 640px at 78% 70%, var(--d-labC), transparent 58%),
    radial-gradient(980px 620px at 62% 32%, var(--d-labB), transparent 62%),
    radial-gradient(840px 520px at 36% 82%, var(--d-bioG), transparent 62%),
    linear-gradient(180deg, var(--d-bg), var(--d-bg2));
}

.ui{ position: relative; z-index: 2; }
.container{ width: min(1200px, 92vw); margin:0 auto; }

/* -------------------------
   BACKGROUND DECOR (UPDATED: DNA + MOLECULES + GRID)
--------------------------*/
.bgDecor{
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events:none;
  overflow:hidden;
}

/* GRID + DOTS (lab paper) */
.bgDecor::before{
  content:"";
  position:absolute;
  inset:-35%;
  pointer-events:none;
  opacity: .18;
  background:
    radial-gradient(circle, rgba(255,255,255,.22) 0 1.2px, transparent 1.6px) 0 0 / 26px 26px,
    linear-gradient(90deg, rgba(255,255,255,.10) 1px, transparent 1px) 0 0 / 78px 78px,
    linear-gradient(0deg,  rgba(255,255,255,.10) 1px, transparent 1px) 0 0 / 78px 78px;
  transform: rotate(8deg);
  filter: blur(.15px);
}

/* DNA + MOLECULES (hex + bonds + blobs) */
.bgDecor::after{
  content:"";
  position:absolute;
  inset:-35%;
  pointer-events:none;

  background:
    repeating-radial-gradient(
      circle at 30% 30%,
      rgba(34,211,238,.10) 0 1px,
      transparent 2px 28px
    ),
    repeating-radial-gradient(
      circle at 70% 55%,
      rgba(168,85,247,.09) 0 1px,
      transparent 2px 30px
    ),

    repeating-linear-gradient(
      120deg,
      rgba(255,255,255,.08) 0 1px,
      transparent 1px 22px
    ),
    repeating-linear-gradient(
      60deg,
      rgba(255,255,255,.06) 0 1px,
      transparent 1px 26px
    ),

    radial-gradient(120px 28px at 18% 18%, rgba(34,211,238,.22), transparent 62%),
    radial-gradient(120px 28px at 26% 26%, rgba(168,85,247,.20), transparent 62%),
    radial-gradient(120px 28px at 34% 34%, rgba(34,197,94,.16), transparent 62%),
    radial-gradient(120px 28px at 42% 42%, rgba(59,130,246,.20), transparent 62%),
    radial-gradient(120px 28px at 50% 50%, rgba(34,211,238,.18), transparent 62%),
    radial-gradient(120px 28px at 58% 58%, rgba(168,85,247,.18), transparent 62%),
    radial-gradient(120px 28px at 66% 66%, rgba(34,197,94,.14), transparent 62%),
    radial-gradient(120px 28px at 74% 74%, rgba(59,130,246,.18), transparent 62%),
    radial-gradient(120px 28px at 82% 82%, rgba(34,211,238,.16), transparent 62%),

    radial-gradient(120px 28px at 22% 22%, rgba(255,79,216,.12), transparent 62%),
    radial-gradient(120px 28px at 30% 30%, rgba(34,211,238,.14), transparent 62%),
    radial-gradient(120px 28px at 38% 38%, rgba(168,85,247,.14), transparent 62%),
    radial-gradient(120px 28px at 46% 46%, rgba(34,197,94,.12), transparent 62%),
    radial-gradient(120px 28px at 54% 54%, rgba(59,130,246,.14), transparent 62%),
    radial-gradient(120px 28px at 62% 62%, rgba(255,79,216,.10), transparent 62%),
    radial-gradient(120px 28px at 70% 70%, rgba(34,211,238,.12), transparent 62%),
    radial-gradient(120px 28px at 78% 78%, rgba(168,85,247,.12), transparent 62%),

    radial-gradient(420px 280px at 15% 70%, rgba(34,197,94,.12), transparent 60%),
    radial-gradient(520px 320px at 85% 30%, rgba(34,211,238,.12), transparent 62%),
    radial-gradient(560px 340px at 72% 86%, rgba(168,85,247,.12), transparent 62%),
    radial-gradient(380px 260px at 38% 18%, rgba(59,130,246,.10), transparent 62%);
  filter: blur(12px);
  opacity:.85;
  animation: bioChemFloat 12s ease-in-out infinite;
}

@keyframes bioChemFloat{
  0%   { transform: translate3d(0,0,0) scale(1); }
  50%  { transform: translate3d(-18px, 14px, 0) scale(1.02); }
  100% { transform: translate3d(0,0,0) scale(1); }
}

body.theme-light .bgDecor::before{ opacity:.12; }
body.theme-light .bgDecor::after{ opacity:.55; filter: blur(14px); }

body.theme-dark  .bgDecor::before{ opacity:.18; }
body.theme-dark  .bgDecor::after{ opacity:.90; filter: blur(12px); }

/* -------------------------
   waves SVG layer
--------------------------*/
.waves{
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  display:none;
}
body.theme-dark .waves{ display:block; }

.waves svg{
  width: 100%;
  height: 100%;
  opacity: .55;
  filter: blur(.1px);
}
.waves path{
  animation: waveMove 9s ease-in-out infinite;
  transform-origin: center;
}
.waves path:nth-child(2){ animation-duration: 11s; opacity: .55; }
.waves path:nth-child(3){ animation-duration: 13s; opacity: .45; }

@keyframes waveMove{
  0%   { transform: translateX(0); }
  50%  { transform: translateX(-40px); }
  100% { transform: translateX(0); }
}

/* -------------------------
   HEADER (Responsive)
--------------------------*/
.header{
  position: sticky;
  top: 0;
  z-index: 50;
}
body.theme-light .header{
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(244,251,255,.92), rgba(244,251,255,.65));
  border-bottom: 1px solid rgba(15,23,42,.06);
}
body.theme-dark .header{
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(5,8,18,.82), rgba(5,8,18,.45));
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.headerInner{
  display:flex;
  align-items:center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 14px;
}

.brand{
  display:flex;
  align-items:center;
  gap: 10px;
  font-weight: 900;
  text-decoration:none;
  white-space: nowrap;
}
body.theme-light .brand{ color: #2563eb; }
body.theme-dark .brand{ color: rgba(34,211,238,.95); }

/* ✅ FIX: Logo sizing (responsive + prevents huge logo) */
.brandIcon{
  width: clamp(34px, 3.2vw, 42px);
  height: clamp(34px, 3.2vw, 42px);
  border-radius: 14px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight: 900;
  flex: 0 0 auto;
  overflow: hidden;           /* important for big images */
}
.brandIcon img,
.brandIcon svg{
  width: 100%;
  height: 100%;
  object-fit: contain;        /* keeps logo inside without cropping */
  display:block;
}

/* ✅ FIX: Keep brand text not too big */
.brand span{
  font-size: 16px;
  letter-spacing: -0.2px;
}
@media(max-width: 520px){
  .brand span{ font-size: 14px; }
  .headerInner{ padding: 12px 0; }
}

body.theme-light .brandIcon{
  background: rgba(37,99,235,.10);
  border: 1px solid rgba(37,99,235,.18);
  color: #2563eb;
}
body.theme-dark .brandIcon{
  background: rgba(34,211,238,.10);
  border: 1px solid rgba(34,211,238,.18);
  color: rgba(34,211,238,.95);
}

.nav{
  display:flex;
  align-items:center;
  gap: 10px;
  font-size: 14px;
}
body.theme-light .nav{ color: #64748b; }
body.theme-dark .nav{ color: rgba(238,242,255,.72); }

.nav a{
  color: inherit;
  text-decoration:none;
  padding: 8px 10px;
  border-radius: 999px;
}
body.theme-light .nav a:hover{ background: rgba(15,23,42,.05); color: #0f172a; }
body.theme-dark .nav a:hover{ background: rgba(255,255,255,.06); color: #eef2ff; }

.headerActions{ display:flex; align-items:center; gap:10px; }

.btn{
  height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid rgba(15,23,42,.10);
  background: rgba(255,255,255,.78);
  color: inherit;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size: 14px;
  box-shadow: 0 10px 30px rgba(15,23,42,.06);
  transition: .18s ease;
  cursor:pointer;
  white-space: nowrap;
}
body.theme-dark .btn{
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(10,14,28,.55);
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}
.btn:hover{ transform: translateY(-1px); }

.btnPrimary{
  border: 1px solid rgba(37,99,235,.20);
  background: linear-gradient(90deg, rgba(37,99,235,.95), rgba(34,211,238,.92));
  color: white;
}
body.theme-dark .btnPrimary{
  border: 1px solid rgba(34,211,238,.22);
  background: linear-gradient(90deg, rgba(34,211,238,.95), rgba(168,85,247,.85));
}

/* theme toggle */
.themeToggle{
  width: 46px;
  padding: 0;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-weight: 900;
}

/* burger (mobile) */
.burger{
  width: 46px;
  padding:0;
  font-weight: 900;
  display:none;
}
@media(max-width: 980px){
  .nav{ display:none; }
  .burger{ display:inline-flex; }
}

/* mobile menu sheet */
.mobileSheet{
  position: fixed;
  inset: 0;
  z-index: 80;
  display:none;
  align-items:flex-start;
  justify-content:center;
  padding: 16px;
}
.mobileSheet.show{ display:flex; }

.mobileSheetBackdrop{
  position:absolute;
  inset:0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(6px);
}
.mobileSheetPanel{
  position: relative;
  width: min(520px, 94vw);
  border-radius: 24px;
  padding: 14px;
  margin-top: 64px;
}
body.theme-light .mobileSheetPanel{
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(15,23,42,.10);
  box-shadow: var(--l-shadow);
}
body.theme-dark .mobileSheetPanel{
  background: rgba(10,14,28,.72);
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: var(--d-shadow);
}

.mobileNav{
  display:grid;
  gap: 10px;
  padding: 10px;
}
.mobileNav a{
  padding: 12px 14px;
  border-radius: 16px;
  text-decoration:none;
  color: inherit;
}
body.theme-light .mobileNav a{ background: rgba(15,23,42,.03); border:1px solid rgba(15,23,42,.06); }
body.theme-dark .mobileNav a{ background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.08); }

.mobileActions{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 10px;
}
@media(max-width: 420px){
  .mobileActions{ grid-template-columns: 1fr; }
}

/* -------------------------
   HERO + TEACHER CARD
--------------------------*/
.hero{ padding: 64px 0 26px; position: relative; }
.heroInner{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 28px;
  align-items:center;
}
@media(max-width: 980px){
  .hero{ padding: 44px 0 10px; }
  .heroInner{ grid-template-columns: 1fr; }
}

.badge{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
}
body.theme-light .badge{
  border: 1px solid rgba(37,99,235,.18);
  background: rgba(37,99,235,.08);
  color: #2563eb;
}
body.theme-dark .badge{
  border: 1px solid rgba(34,211,238,.18);
  background: rgba(34,211,238,.08);
  color: rgba(34,211,238,.95);
}

.neonTitle{
  margin: 14px 0 10px;
  font-size: 68px;
  line-height: 1.02;
  letter-spacing: -0.8px;
  font-weight: 1000;
}
@media(max-width: 980px){ .neonTitle{ font-size: 50px; } }
@media(max-width: 520px){ .neonTitle{ font-size: 40px; } }

body.theme-dark .neonTitle{
  background: linear-gradient(90deg,
    rgba(34,211,238,1),
    rgba(59,130,246,1),
    rgba(168,85,247,.9)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow:
    0 0 18px rgba(34,211,238,.28),
    0 0 28px rgba(59,130,246,.22),
    0 0 38px rgba(168,85,247,.16);
}
body.theme-light .neonTitle{ color: #0f172a; }
body.theme-light .neonTitle .dot{ color: #2563eb; }
body.theme-dark .neonTitle .dot{
  color: rgba(34,211,238,1);
  text-shadow:
    0 0 18px rgba(34,211,238,.55),
    0 0 34px rgba(59,130,246,.35);
}

.heroSubline{
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  max-width: 62ch;
  font-weight: 700;
}
body.theme-light .heroSubline{ color: rgba(15,23,42,.62); }
body.theme-dark .heroSubline{ color: rgba(238,242,255,.70); }

.ctaRow{ display:flex; gap: 12px; flex-wrap: wrap; margin-top: 10px; }
@media(max-width: 520px){
  .ctaRow{ display:grid; grid-template-columns: 1fr; }
  .ctaRow .btn{ width: 100%; }
}

/* Teacher card */
.teacherCard{
  border-radius: var(--radius);
  padding: 16px;
  position: relative;
  overflow:hidden;
}
body.theme-light .teacherCard{
  background: rgba(255,255,255,.88);
  border: 1px solid var(--l-stroke);
  box-shadow: var(--l-shadow);
}
body.theme-dark .teacherCard{
  background: rgba(10,14,28,.50);
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: var(--d-shadow);
}
.teacherCard::before{
  content:"";
  position:absolute;
  inset:-60%;
  background:
    radial-gradient(circle at 30% 40%, rgba(34,211,238,.16), transparent 55%),
    radial-gradient(circle at 70% 70%, rgba(168,85,247,.14), transparent 55%);
  filter: blur(18px);
  opacity:.8;
}

.teacherImgWrap{
  position: relative;
  border-radius: 22px;
  overflow:hidden;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.05);
}
.teacherImg{
  width: 100%;
  height: min(440px, 56vh);
  object-fit: cover;
  display:block;
}
@media(max-width: 520px){
  .teacherImg{ height: 360px; }
}

.teacherMeta{
  position:absolute;
  left: 14px;
  right: 14px;
  bottom: 14px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.22);
  background: rgba(2,6,23,.55);
  color: white;
  padding: 12px 12px;
  backdrop-filter: blur(12px);
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 10px;
}
.teacherMeta strong{ font-size: 14px; }
.teacherMeta span{ opacity:.85; font-size: 12px; }

.teacherEntrance{
  opacity: 0;
  transform: translateY(70px);
  animation: teacherUp 1.1s cubic-bezier(.2,.9,.2,1) forwards;
  animation-delay: .15s;
}
@keyframes teacherUp{
  0%{ opacity:0; transform: translateY(80px) scale(.98); }
  65%{ opacity:1; transform: translateY(-8px) scale(1.01); }
  100%{ opacity:1; transform: translateY(0) scale(1); }
}

/* -------------------------
   SECTION TITLES
--------------------------*/
.section{ padding: 42px 0 70px; position: relative; }
@media(max-width: 520px){ .section{ padding: 34px 0 56px; } }

.sectionTitle{ text-align:center; margin-bottom: 26px; }
.sectionTitle h2{ margin:0; font-size: 46px; letter-spacing:-0.4px; }
@media(max-width: 720px){ .sectionTitle h2{ font-size: 34px; } }
.sectionTitle p{
  margin: 10px auto 0;
  max-width: 62ch;
  line-height: 1.8;
}
body.theme-light .sectionTitle p{ color: var(--l-muted); }
body.theme-dark .sectionTitle p{ color: var(--d-muted); }

/* =========================
   SUBJECT CARDS (match screenshot)
========================= */
.subjectsGrid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  align-items: stretch;
}
@media(max-width: 980px){
  .subjectsGrid{ grid-template-columns: 1fr; }
}

.subjectCard{
  position: relative;
  border-radius: 34px;
  padding: 26px 22px 22px;
  overflow:hidden;
  min-height: 420px;
  backdrop-filter: blur(18px);
  transition: .18s ease;
  display:flex;
  flex-direction: column;
  transform-style: preserve-3d;
}
/* =========================
   SUBJECT IMAGE (Responsive fixed sizing)
========================= */
.subjectImageWrap{
  width: 100%;
  border-radius: 22px;
  overflow: hidden;
  position: relative;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);

  /* Desktop default ratio */
  aspect-ratio: 16 / 10;
}

.subjectImage{
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center;
  transform: scale(1.02);
  transition: transform .25s ease;
}

/* hover zoom */
.subjectCard:hover .subjectImage{
  transform: scale(1.06);
}

/* Tablet + small desktop */
@media (max-width: 980px){
  .subjectImageWrap{
    aspect-ratio: 16 / 9;
  }
}

/* Mobile */
@media (max-width: 520px){
  .subjectImageWrap{
    aspect-ratio: 4 / 3;
  }
}
@media(max-width: 980px){
  .subjectCard{ min-height: unset; }
}

.subjectCard:hover{ transform: translateY(-4px) scale(1.01); }

body.theme-light .subjectCard{
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(15,23,42,.10);
  box-shadow: var(--l-shadow);
}

body.theme-dark .subjectCard{
  background: rgba(10,14,28,.45);
  border: 1px solid rgba(255,255,255,.10);
  box-shadow: 0 28px 120px rgba(0,0,0,.55);
}

.subjectCard::before{
  content:"";
  position:absolute;
  inset:-30%;
  opacity: .8;
  filter: blur(18px);
  transform: translate3d(0,0,0);
}

/* Shine */
.subjectCard::after{
  content:"";
  position:absolute;
  inset:-40%;
  background: linear-gradient(120deg,
    transparent 35%,
    rgba(255,255,255,.10) 48%,
    transparent 62%
  );
  transform: translateX(-60%) rotate(12deg);
  opacity: 0;
  pointer-events:none;
}
.subjectCard:hover::after{
  opacity: .9;
  animation: shineMove .9s ease forwards;
}
@keyframes shineMove{
  from { transform: translateX(-60%) rotate(12deg); }
  to   { transform: translateX(60%)  rotate(12deg); }
}

/* neon frames per card (dark) */
body.theme-dark .subjectCard.pink{
  box-shadow:
    0 0 0 2px rgba(255,79,216,.22),
    0 0 90px rgba(255,79,216,.20),
    0 30px 120px rgba(0,0,0,.55);
  animation: neonPulse 4.2s ease-in-out infinite;
}
body.theme-dark .subjectCard.purple{
  box-shadow:
    0 0 0 2px rgba(168,85,247,.22),
    0 0 90px rgba(168,85,247,.18),
    0 30px 120px rgba(0,0,0,.55);
  animation: neonPulse 4.2s ease-in-out infinite .4s;
}
body.theme-dark .subjectCard.cyan{
  box-shadow:
    0 0 0 2px rgba(34,211,238,.22),
    0 0 90px rgba(34,211,238,.18),
    0 30px 120px rgba(0,0,0,.55);
  animation: neonPulse 4.2s ease-in-out infinite .8s;
}
body.theme-dark .subjectCard.pink::before{
  background:
    radial-gradient(circle at 30% 30%, rgba(255,79,216,.25), transparent 60%),
    radial-gradient(circle at 70% 70%, rgba(168,85,247,.18), transparent 60%);
}
body.theme-dark .subjectCard.purple::before{
  background:
    radial-gradient(circle at 30% 30%, rgba(168,85,247,.24), transparent 60%),
    radial-gradient(circle at 70% 70%, rgba(255,79,216,.16), transparent 60%);
}
body.theme-dark .subjectCard.cyan::before{
  background:
    radial-gradient(circle at 30% 30%, rgba(34,211,238,.22), transparent 60%),
    radial-gradient(circle at 70% 70%, rgba(59,130,246,.16), transparent 60%);
}

@keyframes neonPulse{
  0%,100%{ filter: saturate(1) brightness(1); }
  50%{ filter: saturate(1.15) brightness(1.05); }
}

.subjectTop{
  position: relative;
  display:flex;
  align-items:flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.badgeStar{
  display:flex;
  align-items:center;
  gap: 10px;
  font-size: 13px;
  opacity:.85;
}
.badgeStar b{ color: var(--gold); font-size: 14px; }

.subjectIcon{
  width: 56px;
  height: 56px;
  border-radius: 18px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight: 900;
}
body.theme-light .subjectIcon{
  border: 1px solid rgba(15,23,42,.10);
  background: rgba(15,23,42,.03);
}
body.theme-dark .subjectIcon{
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
}

.subjectTitle{
  position: relative;
  margin: 10px 0 6px;
  font-size: 26px;
  font-weight: 1000;
  letter-spacing: -.2px;
}
.subjectSub{ margin: 0 0 12px; opacity:.85; font-weight: 800; }
.subjectDesc{ margin: 0 0 16px; line-height: 1.85; font-size: 14px; opacity:.78; }

.subjectPills{ display:flex; gap: 10px; flex-wrap: wrap; margin: 0 0 18px; }
.subjectPill{
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 12px;
  opacity:.9;
}
body.theme-light .subjectPill{ border: 1px solid rgba(15,23,42,.10); background: rgba(15,23,42,.03); }
body.theme-dark .subjectPill{ border: 1px solid rgba(255,255,255,.12); background: rgba(255,255,255,.06); }

.subjectBtn{
  margin-top: auto;
  width: 100%;
  height: 56px;
  border-radius: 20px;
  border: none;
  cursor:pointer;
  font-weight: 950;
  font-size: 14px;
  color: white;
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 12px;
  transition: .18s ease;
  box-shadow: 0 18px 50px rgba(0,0,0,.35);
  position: relative;
  overflow:hidden;
}
.subjectBtn:hover{ transform: translateY(-1px); animation: microBounce .22s ease; }

@keyframes microBounce{
  0%{ transform: translateY(0); }
  50%{ transform: translateY(-2px); }
  100%{ transform: translateY(0); }
}

/* button sweep */
.subjectBtn::after{
  content:"";
  position:absolute;
  top:-40%;
  left:-60%;
  width: 55%;
  height: 180%;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,.22), transparent);
  transform: rotate(18deg);
  opacity: 0;
}
.subjectCard:hover .subjectBtn::after{
  opacity:.7;
  animation: btnSweep .9s ease forwards;
}
@keyframes btnSweep{ from { left:-60%; } to { left:120%; } }

/* gradients like screenshot */
.subjectCard.pink .subjectTitle{ color: rgba(255,79,216,.95); }
.subjectCard.pink .subjectBtn{ background: linear-gradient(90deg, rgba(255,79,216,.95), rgba(168,85,247,.85)); }

.subjectCard.purple .subjectTitle{ color: rgba(168,85,247,.95); }
.subjectCard.purple .subjectBtn{ background: linear-gradient(90deg, rgba(168,85,247,.95), rgba(255,79,216,.85)); }

.subjectCard.cyan .subjectTitle{ color: rgba(34,211,238,.95); }
.subjectCard.cyan .subjectBtn{ background: linear-gradient(90deg, rgba(34,211,238,.95), rgba(59,130,246,.85)); }

/* -------------------------
   WHY CHOOSE (✅ icon inline, not above)
--------------------------*/
.featureGrid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media(max-width: 980px){ .featureGrid{ grid-template-columns: 1fr; } }

.featureCard{
  border-radius: var(--radius);
  padding: 18px 18px;
  position: relative;
  overflow:hidden;
  min-height: 110px;
  transition: transform .18s ease, box-shadow .18s ease;
  display:flex;
  flex-direction: column;
  justify-content:center;
}
body.theme-light .featureCard{
  background: #ffffff;
  border: 1px solid rgba(15,23,42,.10);
  box-shadow: 0 18px 55px rgba(15,23,42,.10);
}
body.theme-dark .featureCard{
  background: rgba(10,14,28,.55);
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: 0 22px 85px rgba(0,0,0,.55);
}
.featureCard:hover{ transform: translateY(-4px); }

.featureHead{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}
.featureTitle{
  margin:0;
  font-size: 16px;
  font-weight: 950;
}
.featureDesc{
  margin:0;
  font-size: 13px;
  line-height: 1.75;
}
body.theme-light .featureDesc{ color: rgba(15,23,42,.62); }
body.theme-dark .featureDesc{ color: rgba(238,242,255,.70); }

.featureIcon{
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight: 900;
  flex: 0 0 auto;
}
body.theme-light .featureIcon{
  background: rgba(15,23,42,.04);
  border: 1px solid rgba(15,23,42,.10);
}
body.theme-dark .featureIcon{
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
}

/* -------------------------
   FOOTER
--------------------------*/
.footer{
  position: relative;
  padding: 54px 0 26px;
}
body.theme-light .footer{
  background: rgba(255,255,255,.55);
  border-top: 1px solid rgba(15,23,42,.06);
}
body.theme-dark .footer{
  background: linear-gradient(180deg, rgba(6,8,18,.2), rgba(5,8,18,.85));
  border-top: 1px solid rgba(255,255,255,.06);
}

.footerGrid{
  display:grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 20px;
  align-items: start;
}
@media(max-width: 980px){ .footerGrid{ grid-template-columns: 1fr; } }

.footerCol h4{
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 900;
}
body.theme-light .footerCol h4{ color: rgba(15,23,42,.85); }
body.theme-dark .footerCol h4{ color: rgba(238,242,255,.90); }

.footerLinks{
  display:grid;
  gap: 10px;
  font-size: 13px;
}
.footerLinks a{
  text-decoration:none;
  color: inherit;
  opacity:.85;
}
.footerLinks a:hover{ opacity:1; }

.footerBrand{
  display:flex;
  align-items:flex-start;
  gap: 12px;
}
.footerBrand .logo{
  width: 48px; height: 48px;
  border-radius: 16px;
  display:flex; align-items:center; justify-content:center;
  font-weight: 900;
  overflow:hidden;
}
.footerBrand .logo img,
.footerBrand .logo svg{
  width:100%;
  height:100%;
  object-fit:contain;
  display:block;
}
body.theme-light .footerBrand .logo{
  background: rgba(37,99,235,.10);
  border: 1px solid rgba(37,99,235,.18);
  color: #2563eb;
}
body.theme-dark .footerBrand .logo{
  background: rgba(34,211,238,.10);
  border: 1px solid rgba(34,211,238,.18);
  color: rgba(34,211,238,.95);
}

.footerBrand p{
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.8;
}
body.theme-light .footerBrand p{ color: rgba(15,23,42,.62); }
body.theme-dark .footerBrand p{ color: rgba(238,242,255,.70); }

.socialRow{
  display:flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.socialBtn{
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display:flex;
  align-items:center;
  justify-content:center;
  text-decoration:none;
}
body.theme-light .socialBtn{
  background: rgba(15,23,42,.04);
  border: 1px solid rgba(15,23,42,.10);
  color: rgba(15,23,42,.75);
}
body.theme-dark .socialBtn{
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);
  color: rgba(238,242,255,.85);
}
.socialBtn:hover{ transform: translateY(-1px); }

.copyright{
  margin-top: 28px;
  font-size: 12px;
  opacity:.75;
  text-align:center;
}

/* -------------------------
   LOADING (1.5s)
--------------------------*/
.loadingOverlay{
  position: fixed;
  inset: 0;
  z-index: 9999;
  display:flex;
  align-items:center;
  justify-content:center;
}
body.theme-light .loadingOverlay{
  background:
    radial-gradient(900px 520px at 78% 12%, var(--l-labB), transparent 58%),
    radial-gradient(900px 520px at 16% 40%, var(--l-labC), transparent 58%),
    radial-gradient(760px 420px at 30% 78%, var(--l-bioG), transparent 60%),
    linear-gradient(180deg, var(--l-bg), var(--l-bg2));
}
body.theme-dark .loadingOverlay{
  background:
    radial-gradient(1000px 650px at 20% 22%, var(--d-labA), transparent 58%),
    radial-gradient(980px 640px at 78% 70%, var(--d-labC), transparent 58%),
    radial-gradient(840px 520px at 36% 82%, var(--d-bioG), transparent 62%),
    linear-gradient(180deg, var(--d-bg), var(--d-bg2));
}
.loadingBox{
  width: min(520px, 92vw);
  border-radius: 28px;
  padding: 24px 20px;
  text-align:center;
  backdrop-filter: blur(14px);
}
body.theme-light .loadingBox{
  background: rgba(255,255,255,.86);
  border: 1px solid rgba(15,23,42,.10);
  box-shadow: var(--l-shadow);
}
body.theme-dark .loadingBox{
  background: rgba(10,14,28,.55);
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: var(--d-shadow);
}
.loadingLine{
  height: 10px;
  border-radius: 999px;
  overflow:hidden;
  margin: 12px auto 16px;
  width: min(360px, 86%);
}
body.theme-light .loadingLine{ background: rgba(59,130,246,.12); }
body.theme-dark .loadingLine{ background: rgba(255,255,255,.08); }
.loadingLine span{
  display:block;
  height: 100%;
  width: 45%;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(34,211,238,.95), rgba(168,85,247,.85));
  animation: move 1.05s ease-in-out infinite;
}
@keyframes move{ 0%{ transform: translateX(-20%);} 100%{ transform: translateX(140%);} }

.loadingTitle{ margin:0; font-size: 26px; font-weight: 900; }
body.theme-light .loadingTitle{ color:#2563eb; }
body.theme-dark .loadingTitle{ color: rgba(34,211,238,.95); }
.loadingSub{ margin: 6px 0 0; font-size: 13px; opacity:.75; }
.loadingHide{ animation: fadeOut .35s ease forwards; }
@keyframes fadeOut{ to{ opacity:0; transform: scale(.98);} }

/* -------------------------
   Reveal animation
--------------------------*/
.reveal{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .75s ease, transform .75s ease;
  will-change: opacity, transform;
}
.reveal.show{
  opacity: 1;
  transform: translateY(0);
}

/* waves parallax vars */
body.theme-dark .waves{
  transform: translate3d(calc(var(--mx, 0px) * 1), calc(var(--my, 0px) * 1), 0);
  transition: transform .08s linear;
}
body.theme-dark .bgDecor::after{
  transform: translate3d(calc(var(--mx, 0px) * .6), calc(var(--my, 0px) * .6), 0);
}

/* -------------------------
   prefers-reduced-motion
--------------------------*/
@media (prefers-reduced-motion: reduce){
  .reveal,
  .reveal.show{
    transition: none !important;
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
  }
}

/* =========================
    MOBILE FIXES
========================= */

/* Hide login/register buttons on mobile */
@media (max-width: 767.98px){
  .header .headerActions > a.btn,
  .header .headerActions > a.btn.btnPrimary{
    display: none !important;
  }
}

/* Keep header layout clean on mobile */
@media (max-width: 767.98px){
  .header .headerInner{
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
  }

  .header .headerActions{
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
  }
}

/* Prevent horizontal overflow on mobile */
@media (max-width: 767.98px){
  html, body{
    overflow-x: hidden !important;
    max-width: 100% !important;
  }

  .ui, .container, .header, main, section, footer{
    max-width: 100% !important;
  }
}

/* Fallback (if someone keeps old markup) */
.brandLogo{width: clamp(34px, 3.2vw, 42px);height: clamp(34px, 3.2vw, 42px);object-fit: contain;display:block;}
.brandText{font-size:16px;font-weight:900;letter-spacing:-0.2px;}

/* =========================================================
   BIO GREEN REVAMP (DNA animation + molecules particles + glow buttons)
   - Overrides palette to Bio Green
   - Adds animated DNA layer + particle molecules field
   ========================================================= */

/* ---- Palette override (Bio Green) ---- */
:root{
  --bio-main: #22c55e;
  --bio-deep: #16a34a;
  --bio-mint: #34d399;
  --bio-cyan: #22d3ee;
  --bio-amber: #fbbf24;
}

/* Make overall vibe greener (both themes) */
body.theme-light{
  background:
    radial-gradient(980px 560px at 78% 12%, rgba(34,211,238,.10), transparent 58%),
    radial-gradient(900px 520px at 18% 36%, rgba(34,197,94,.14), transparent 58%),
    radial-gradient(820px 520px at 70% 86%, rgba(34,211,238,.10), transparent 60%),
    radial-gradient(760px 420px at 30% 78%, rgba(34,197,94,.10), transparent 60%),
    linear-gradient(180deg, var(--l-bg), var(--l-bg2));
}
body.theme-dark{
  background:
    radial-gradient(1100px 720px at 18% 22%, rgba(34,197,94,.12), transparent 58%),
    radial-gradient(980px 640px at 78% 70%, rgba(34,211,238,.10), transparent 58%),
    radial-gradient(980px 620px at 62% 32%, rgba(34,197,94,.10), transparent 62%),
    radial-gradient(840px 520px at 36% 82%, rgba(34,211,238,.08), transparent 62%),
    linear-gradient(180deg, var(--d-bg), var(--d-bg2));
}

/* ---- Logo safety: never overflow / never cover content ---- */
.brandLogo{
  width: clamp(34px, 3.2vw, 46px);
  height: clamp(34px, 3.2vw, 46px);
  object-fit: contain;
  display:block;
  flex: 0 0 auto;
  filter: drop-shadow(0 10px 30px rgba(0,0,0,.18));
}
.brandText{
  font-size: 16px;
  font-weight: 1000;
  letter-spacing: -.2px;
  white-space: nowrap;
}
@media(max-width: 520px){
  .brandText{ font-size: 14px; }
}

/* =========================================================
   DNA ANIMATION LAYER
   ---------------------------------------------------------
   Use inside React:
   <div class="dnaLayer">
     <div class="dnaHelix h1"></div> ...
   </div>
   ========================================================= */
.dnaLayer{
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events:none;
  overflow:hidden;
}
.dnaHelix{
  position: absolute;
  top: -18%;
  width: 240px;
  height: 140%;
  opacity: .26;
  filter: blur(.15px);
  transform-origin: center;
  mix-blend-mode: screen;
}
body.theme-light .dnaHelix{ opacity: .18; mix-blend-mode: multiply; }
body.theme-dark  .dnaHelix{ opacity: .32; }

.dnaHelix::before,
.dnaHelix::after{
  content:"";
  position:absolute;
  top:0; bottom:0;
  width: 10px;
  border-radius: 999px;
  background: linear-gradient(180deg,
    rgba(34,197,94,.00),
    rgba(34,197,94,.55),
    rgba(34,211,238,.45),
    rgba(34,197,94,.00)
  );
  box-shadow: 0 0 26px rgba(34,197,94,.20);
  animation: strandWiggle 2.8s ease-in-out infinite;
}
.dnaHelix::before{ left: 32%; }
.dnaHelix::after { left: 62%; animation-delay: .55s; }

/* "Rungs" between strands */
.dnaHelix .rungs{
  position:absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(34,211,238,.00) 0 10px,
      rgba(34,211,238,.35) 10px 12px,
      rgba(34,197,94,.00) 12px 24px
    );
  mask: radial-gradient(closest-side at 50% 50%, #000 62%, transparent 74%);
  opacity: .65;
  animation: rungsMove 3.6s linear infinite;
}

/* Slight rotation drift */
@keyframes helixDrift{
  0%   { transform: translate3d(0,0,0) rotate(-6deg) scale(1); }
  50%  { transform: translate3d(-14px, 10px, 0) rotate(6deg) scale(1.02); }
  100% { transform: translate3d(0,0,0) rotate(-6deg) scale(1); }
}
@keyframes strandWiggle{
  0%,100%{ transform: translateX(0); }
  50%{ transform: translateX(16px); }
}
@keyframes rungsMove{
  0%{ background-position: 0 0; }
  100%{ background-position: 0 240px; }
}

/* positions */
.dnaHelix.h1{ left: 6%;  animation: helixDrift 11s ease-in-out infinite; }
.dnaHelix.h2{ right: 8%; width: 280px; opacity:.22; animation: helixDrift 13s ease-in-out infinite reverse; }
.dnaHelix.h3{ left: 48%; width: 210px; opacity:.18; transform: translateX(-50%); animation: helixDrift 15s ease-in-out infinite; }

/* =========================================================
   MOLECULES PARTICLES (scientific particles)
   ---------------------------------------------------------
   Created by JS into .moleculeField as spans with inline styles
   ========================================================= */
.moleculeField{
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events:none;
  overflow:hidden;
}
.moleculeParticle{
  position:absolute;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%,
    rgba(255,255,255,.55),
    rgba(34,211,238,.32),
    rgba(34,197,94,.10)
  );
  box-shadow:
    0 0 0 1px rgba(255,255,255,.10),
    0 0 18px rgba(34,211,238,.16),
    0 0 26px rgba(34,197,94,.12);
  opacity: .85;
  animation: particleFloat var(--dur, 14s) ease-in-out infinite;
  transform: translate3d(0,0,0);
}
.moleculeParticle::before{
  content:"";
  position:absolute;
  inset:-10px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(34,211,238,.10), transparent 60%);
  filter: blur(1px);
  opacity:.75;
}
.moleculeParticle::after{
  /* tiny orbit dot */
  content:"";
  position:absolute;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  right: -6px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(34,197,94,.75);
  box-shadow: 0 0 14px rgba(34,197,94,.35);
  animation: orbit 2.8s linear infinite;
  transform-origin: -10px 50%;
}
@keyframes orbit{
  from{ transform: translateY(-50%) rotate(0deg); }
  to  { transform: translateY(-50%) rotate(360deg); }
}
@keyframes particleFloat{
  0%   { transform: translate3d(0,0,0) scale(1); }
  50%  { transform: translate3d(var(--tx, 18px), var(--ty, -14px), 0) scale(1.06); }
  100% { transform: translate3d(0,0,0) scale(1); }
}

/* =========================================================
   BUTTONS: scientific glow
   ========================================================= */
.btn,
.subjectBtn{
  position: relative;
  isolation: isolate;
}
.btnPrimary,
.subjectBtn{
  box-shadow:
    0 0 0 1px rgba(34,197,94,.18),
    0 18px 50px rgba(0,0,0,.35),
    0 0 28px rgba(34,197,94,.22);
}
.btnPrimary{
  border: 1px solid rgba(34,197,94,.24) !important;
  background: linear-gradient(90deg, rgba(34,197,94,.95), rgba(34,211,238,.85)) !important;
}
body.theme-dark .btnPrimary{
  background: linear-gradient(90deg, rgba(34,197,94,.95), rgba(34,211,238,.80)) !important;
}
.btnPrimary::before,
.subjectBtn::before{
  content:"";
  position:absolute;
  inset:-2px;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 30%, rgba(34,197,94,.30), transparent 55%),
              radial-gradient(circle at 80% 60%, rgba(34,211,238,.24), transparent 58%);
  filter: blur(10px);
  opacity: .85;
  z-index: -1;
}
.btnPrimary:hover,
.subjectBtn:hover{
  transform: translateY(-2px);
  box-shadow:
    0 0 0 1px rgba(34,197,94,.26),
    0 26px 70px rgba(0,0,0,.42),
    0 0 40px rgba(34,197,94,.30);
}

/* Harmonize subject card colors to bio palette */
.subjectCard.pink .subjectTitle{ color: rgba(34,197,94,.95); }
.subjectCard.pink .subjectBtn{ background: linear-gradient(90deg, rgba(34,197,94,.95), rgba(34,211,238,.85)); }

.subjectCard.purple .subjectTitle{ color: rgba(34,211,238,.95); }
.subjectCard.purple .subjectBtn{ background: linear-gradient(90deg, rgba(34,211,238,.92), rgba(34,197,94,.85)); }

.subjectCard.cyan .subjectTitle{ color: rgba(34,197,94,.92); }
.subjectCard.cyan .subjectBtn{ background: linear-gradient(90deg, rgba(34,197,94,.92), rgba(16,185,129,.85)); }

/* Keep animations accessible */
@media (prefers-reduced-motion: reduce){
  .dnaHelix, .dnaHelix::before, .dnaHelix::after, .dnaHelix .rungs,
  .moleculeParticle, .moleculeParticle::after{
    animation: none !important;
  }
}