/* ==========================================================================
   PolyBio Industries Ltd. — GLOBAL DESIGN SYSTEM
   The Master Corporate Visiting Card is the visual reference:
   blue-green gradient spine, fine hairlines, subtle arcs, Inter, white space.
   Section-specific styling lives in sections/<name>/<name>.css — never here.
   ========================================================================== */

:root{
  /* Brand tokens — taken from the visiting card, do not add new colours */
  --blue:#004E8C;
  --blue-deep:#003A6B;
  --green:#2E7D22;
  --green-lt:#6DB33F;
  --ink:#1F262E;
  --grey:#5B6672;
  --grey-lt:#9AA5B1;
  --border:#E2E8EE;
  --mist:#F4F7FA;
  --white:#FFFFFF;

  --spine:linear-gradient(180deg,var(--blue) 0%,#1A6A63 52%,var(--green) 100%);
  --spine-h:linear-gradient(90deg,var(--blue) 0%,#1A6A63 52%,var(--green) 100%);

  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --font-bn:"Noto Sans Bengali",var(--font);

  --r-sm:8px; --r:12px; --r-lg:16px;
  --shadow:0 1px 2px rgba(31,38,46,.04),0 8px 24px -12px rgba(31,38,46,.10);
  --shadow-lift:0 2px 4px rgba(31,38,46,.05),0 18px 40px -18px rgba(0,78,140,.22);

  --gap:clamp(18px,4vw,28px);
  --sec-y:clamp(56px,8vw,104px);
  --maxw:1200px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;overflow-x:hidden}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--white);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-deep)}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:2px}
h1,h2,h3,h4{margin:0;line-height:1.18;letter-spacing:-.02em;font-weight:600}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:lang(bn),.pb-bn{font-family:var(--font-bn);line-height:1.8}

.pb-skip{position:absolute;left:-9999px;top:0;background:var(--blue);color:#fff;
  padding:10px 16px;border-radius:0 0 var(--r-sm) 0;z-index:200}
.pb-skip:focus{left:0;color:#fff}

.pb-container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(18px,5vw,32px)}
.pb-section{position:relative;padding-block:var(--sec-y);overflow:hidden}
.pb-section--mist{background:var(--mist);border-block:1px solid var(--border)}
.pb-section--tight{padding-block:clamp(40px,6vw,72px)}

/* ---------- type scale ---------- */
.pb-h1{font-size:clamp(2.15rem,1.2rem + 4.2vw,4.1rem);font-weight:600;letter-spacing:-.035em;line-height:1.04}
.pb-h2{font-size:clamp(1.55rem,1.1rem + 1.9vw,2.5rem);letter-spacing:-.028em}
.pb-h3{font-size:clamp(1.06rem,.98rem + .4vw,1.28rem);letter-spacing:-.016em}
.pb-lead{font-size:clamp(1rem,.95rem + .3vw,1.16rem);color:var(--grey);max-width:64ch;margin-top:16px}
.pb-eyebrow{
  font-size:.688rem;font-weight:500;letter-spacing:.18em;text-transform:uppercase;
  color:var(--grey-lt);margin:0 0 14px;
}
.pb-muted{color:var(--grey)}
.pb-small{font-size:.813rem;line-height:1.65;color:var(--grey)}
.pb-gradient-text{
  background:var(--spine-h);-webkit-background-clip:text;background-clip:text;color:transparent;
}

/* ---------- the gradient spine: the card's signature, reused everywhere ---------- */
.pb-head{position:relative;padding-left:22px;max-width:76ch;margin-bottom:clamp(28px,4vw,48px)}
.pb-head::before{
  content:"";position:absolute;left:0;top:4px;bottom:4px;width:3px;border-radius:3px;background:var(--spine);
}
.pb-head--center{text-align:center;padding-left:0;margin-inline:auto}
.pb-head--center::before{left:50%;transform:translateX(-50%);top:auto;bottom:auto;
  height:26px;width:3px;position:relative;display:block;margin:0 auto 18px}

/* ---------- arcs motif ---------- */
.pb-arcs{position:absolute;pointer-events:none;color:var(--blue);opacity:.07;
  width:min(760px,90vw);height:auto;z-index:0}
.pb-arcs--right{right:-14%;bottom:-32%}
.pb-arcs--left{left:-20%;top:-28%;transform:scaleX(-1)}
.pb-section > .pb-container{position:relative;z-index:1}

/* ---------- buttons ---------- */
.pb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 22px;border-radius:var(--r);border:1px solid var(--border);
  background:var(--white);color:var(--ink);font:inherit;font-size:.938rem;font-weight:500;
  letter-spacing:-.005em;cursor:pointer;transition:background .2s,border-color .2s,color .2s,transform .2s;
}
.pb-btn:hover{border-color:var(--blue);color:var(--blue);transform:translateY(-1px)}
.pb-btn:active{transform:translateY(0)}
.pb-btn--primary{background:var(--blue);border-color:var(--blue);color:#fff}
.pb-btn--primary:hover{background:var(--blue-deep);border-color:var(--blue-deep);color:#fff}
.pb-btn--green{background:var(--green);border-color:var(--green);color:#fff}
.pb-btn--green:hover{background:#256A1C;border-color:#256A1C;color:#fff}
.pb-btn--ghost{background:transparent}
.pb-btn--sm{padding:9px 16px;font-size:.875rem;border-radius:var(--r-sm)}
.pb-btn--lg{padding:16px 28px;font-size:1rem}
.pb-btn--block{display:flex;width:100%}
.pb-btn__arrow{transition:transform .2s}
.pb-btn:hover .pb-btn__arrow{transform:translateX(3px)}
.pb-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}

/* ---------- cards ---------- */
.pb-card{
  position:relative;background:var(--white);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:clamp(20px,2.4vw,28px);box-shadow:var(--shadow);
  transition:border-color .25s,box-shadow .25s,transform .25s;
}
.pb-card:hover{border-color:#CBD8E6;box-shadow:var(--shadow-lift);transform:translateY(-2px)}
.pb-card__num{
  font-size:.688rem;font-weight:600;letter-spacing:.14em;color:var(--grey-lt);
  display:block;margin-bottom:12px;
}
.pb-card h3{margin-bottom:8px}
.pb-card p{color:var(--grey);font-size:.938rem}
.pb-card--flat{box-shadow:none}
.pb-card--flat:hover{transform:none;box-shadow:var(--shadow)}
.pb-card--spine{padding-left:26px}
.pb-card--spine::before{
  content:"";position:absolute;left:0;top:18px;bottom:18px;width:3px;border-radius:0 3px 3px 0;background:var(--spine);
}
.pb-grid{display:grid;gap:var(--gap)}
.pb-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.pb-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.pb-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- status pills ---------- */
.pb-status{
  display:inline-flex;align-items:center;gap:6px;font-size:.688rem;font-weight:500;
  letter-spacing:.08em;text-transform:uppercase;padding:5px 10px;border-radius:999px;
  border:1px solid var(--border);color:var(--grey);background:var(--mist);white-space:nowrap;
}
.pb-status::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.pb-status.is-current{color:var(--green);border-color:#C9E3C2;background:#F2F9F0}
.pb-status.is-dev{color:var(--blue);border-color:#C7DBEC;background:#F1F7FC}
.pb-status.is-future{color:var(--grey);border-color:var(--border);background:var(--mist)}

/* ---------- data notes / labelled assumptions ---------- */
.pb-note{
  border-left:3px solid var(--green-lt);background:var(--mist);border-radius:0 var(--r) var(--r) 0;
  padding:16px 20px;font-size:.875rem;color:var(--grey);
}
.pb-note strong{color:var(--ink);font-weight:600}
.pb-table{width:100%;border-collapse:collapse;font-size:.938rem}
.pb-table th,.pb-table td{text-align:left;padding:13px 14px;border-bottom:1px solid var(--border);vertical-align:top}
.pb-table th{font-weight:500;color:var(--grey);width:46%}
.pb-table td{font-weight:500}
.pb-table tr:last-child th,.pb-table tr:last-child td{border-bottom:0}
.pb-tag{
  display:inline-block;font-size:.625rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--grey-lt);border:1px solid var(--border);border-radius:4px;padding:2px 6px;margin-left:8px;
  vertical-align:middle;white-space:nowrap;
}

/* ---------- header ---------- */
.pb-header{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
}
.pb-header::after{content:"";display:block;height:2px;background:var(--spine-h);opacity:.9}
.pb-header__inner{
  max-width:var(--maxw);margin-inline:auto;padding:12px clamp(18px,5vw,32px);
  display:flex;align-items:center;gap:20px;
}
.pb-brand{display:flex;align-items:center;gap:11px;color:var(--ink);flex:0 0 auto}
.pb-brand img{width:38px;height:38px;object-fit:contain}
.pb-brand__txt{display:flex;flex-direction:column;line-height:1.15}
.pb-brand__name{font-weight:600;font-size:.938rem;letter-spacing:-.015em}
.pb-brand__pos{font-size:.625rem;letter-spacing:.07em;color:var(--green);font-weight:500}
.pb-nav{margin-left:auto}
.pb-nav__list{display:flex;gap:clamp(10px,1.6vw,22px);align-items:center}
.pb-nav__list a{
  color:var(--grey);font-size:.875rem;font-weight:500;padding:6px 2px;position:relative;white-space:nowrap;
}
.pb-nav__list a:hover{color:var(--ink)}
.pb-nav__list a[aria-current="page"]{color:var(--ink)}
.pb-nav__list a[aria-current="page"]::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;background:var(--spine-h);
}
.pb-header__cta{flex:0 0 auto}
.pb-burger{display:none;width:42px;height:42px;border:1px solid var(--border);border-radius:var(--r-sm);
  background:var(--white);flex-direction:column;justify-content:center;align-items:center;gap:4px;cursor:pointer}
.pb-burger span{display:block;width:17px;height:1.5px;background:var(--ink);transition:transform .25s,opacity .2s}
.pb-burger[aria-expanded="true"] span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.pb-burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.pb-burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* ---------- mobile drawer ---------- */
.pb-drawer{position:fixed;inset:0;z-index:99;background:var(--white);
  padding:84px clamp(18px,6vw,32px) 32px;overflow-y:auto}
.pb-drawer[hidden]{display:none}
.pb-drawer__list{display:flex;flex-direction:column;gap:2px;margin-bottom:24px}
.pb-drawer__list a{
  display:block;padding:15px 4px;font-size:1.15rem;font-weight:500;color:var(--ink);
  border-bottom:1px solid var(--border);letter-spacing:-.02em;
}
.pb-drawer__meta{display:flex;flex-direction:column;gap:8px;margin-top:26px;
  padding-top:22px;border-top:1px solid var(--border);font-size:.938rem}

/* ---------- footer ---------- */
.pb-footer{background:var(--mist);border-top:1px solid var(--border);margin-top:0}
.pb-footer__top{display:grid;grid-template-columns:1.5fr 1fr 1.3fr 1fr;gap:var(--gap);
  padding-block:clamp(44px,6vw,72px)}
.pb-footer__brand img{width:52px;height:52px;object-fit:contain;margin-bottom:14px}
.pb-footer__name{font-weight:600;letter-spacing:-.02em}
.pb-footer__pos{font-size:.813rem;color:var(--green);font-weight:500;margin-top:4px}
.pb-footer__reg{font-size:.75rem;color:var(--grey-lt);margin-top:12px}
.pb-footer__col h2{font-size:.688rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--grey-lt);font-weight:500;margin-bottom:14px}
.pb-footer__col li{margin-bottom:9px}
.pb-footer__col a{color:var(--grey);font-size:.875rem}
.pb-footer__col a:hover{color:var(--blue)}
.pb-footer__addr{font-size:.813rem;color:var(--grey);margin-top:16px;line-height:1.7}
.pb-footer__disclosure{padding-bottom:26px}
.pb-footer__disclosure p{font-size:.75rem;color:var(--grey-lt);border-top:1px solid var(--border);
  padding-top:22px;max-width:96ch}
.pb-footer__bar{border-top:1px solid var(--border);background:var(--white)}
.pb-footer__bar-inner{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  align-items:center;padding-block:18px}
.pb-footer__bar p{font-size:.75rem;color:var(--grey-lt)}
.pb-footer__bar ul{display:flex;gap:18px}
.pb-footer__bar a{font-size:.75rem;color:var(--grey-lt)}

/* ---------- scroll reveal ---------- */
.pb-reveal{opacity:0;transform:translateY(14px)}
.pb-reveal.is-in{opacity:1;transform:none;transition:opacity .7s cubic-bezier(.22,.68,.3,1),transform .7s cubic-bezier(.22,.68,.3,1)}
.pb-reveal.d1{transition-delay:.06s}.pb-reveal.d2{transition-delay:.12s}
.pb-reveal.d3{transition-delay:.18s}.pb-reveal.d4{transition-delay:.24s}
.pb-reveal.d5{transition-delay:.3s}.pb-reveal.d6{transition-delay:.36s}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important}
  .pb-reveal{opacity:1;transform:none}
}