/* ============================================================
   Rakibul Hasan — ceorakib.com
   ============================================================ */

/* ---------- DARK (default) ---------- */
:root,
:root[data-theme="dark"]{
  --bg:#0b0f14;
  --bg2:#10151d;
  --card:#161d27;
  --card2:#1b2330;
  --tx:#eef2f7;
  --mut:#93a0b1;
  --acc:#d4a24a;
  --acc2:#f0c274;
  --line:#222b38;
  --navbg:rgba(11,15,20,.72);
  --navbg2:rgba(11,15,20,.92);
  --sh:rgba(0,0,0,.85);
  --orbA:rgba(212,162,74,.16);
  --orbB:rgba(70,120,200,.14);
  --orbC:rgba(212,162,74,.11);
  --max:1140px;
  --r:16px;
  --ease:cubic-bezier(.22,.68,.28,1);
}

/* ---------- LIGHT ---------- */
:root[data-theme="light"]{
  --bg:#faf9f6;
  --bg2:#f1efe9;
  --card:#ffffff;
  --card2:#f5f3ed;
  --tx:#141821;
  --mut:#5b6472;
  --acc:#9a6f14;          /* darkened so gold passes contrast on light */
  --acc2:#b8862a;
  --line:#e3ded3;
  --navbg:rgba(250,249,246,.78);
  --navbg2:rgba(250,249,246,.94);
  --sh:rgba(20,24,31,.16);
  --orbA:rgba(212,162,74,.20);
  --orbB:rgba(70,120,200,.10);
  --orbC:rgba(212,162,74,.14);
}

/* Theme switching is instant on purpose. A blanket `transition` on `*`
   that gets toggled on and off leaves background-color and color resolved
   to their previous values when it is removed mid-flight, so the page
   ground stays dark while cards go light. Instant is correct and safe. */

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  margin:0;
  background:var(--bg);
  color:var(--tx);
  font-family:"Plus Jakarta Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.68;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit}
p{margin:0 0 1.1em}
h1,h2,h3{line-height:1.15;margin:0 0 .45em;letter-spacing:-.025em}
h1{font-size:clamp(2.6rem,7vw,5rem);font-weight:800}
h2{font-size:clamp(1.75rem,4vw,2.75rem);font-weight:700}
h3{font-size:1.13rem;font-weight:700;letter-spacing:-.01em}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px;position:relative;z-index:2}
.narrow{max-width:680px}
.center{text-align:center}

.skip{position:absolute;left:-9999px;top:0;background:var(--acc);color:#0b0f14;padding:10px 18px;z-index:200;border-radius:0 0 8px 0}
.skip:focus{left:0}

/* ---------- scroll progress ---------- */
.progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:100;
  background:linear-gradient(90deg,var(--acc),var(--acc2));
  transition:width .1s linear;
}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:60;
  background:var(--navbg);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  /* border-color only — transitioning background here made the bar lag a
     step behind the rest of the page on a theme switch. */
  transition:border-color .3s;
}
.nav.scrolled{border-bottom-color:var(--line);background:var(--navbg2)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
/* logo badge — the artwork already has a black ground, so it sits
   invisibly on the dark nav once clipped to a circle */
.mark{
  width:42px;height:42px;flex:none;display:block;
  border-radius:50%;overflow:hidden;background:#000;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease);
}
.mark img{width:100%;height:100%;object-fit:cover;display:block}
.brand:hover .mark{transform:scale(1.06);box-shadow:0 0 18px -4px rgba(212,162,74,.6)}
.brand-tx{font-weight:700;font-size:.95rem;letter-spacing:-.01em}
.nav nav{display:flex;align-items:center;gap:30px}
.nav nav a{text-decoration:none;color:var(--mut);font-size:.9rem;font-weight:500;transition:color .2s;position:relative}
.nav nav a:not(.nav-cta)::after{
  content:"";position:absolute;left:0;bottom:-6px;height:2px;width:0;
  background:var(--acc);transition:width .28s var(--ease);
}
.nav nav a:hover{color:var(--tx)}
.nav nav a:not(.nav-cta):hover::after{width:100%}
.nav-cta{
  border:1px solid var(--line);padding:9px 18px;border-radius:9px;color:var(--tx)!important;
  transition:border-color .2s,background .2s;
}
.nav-cta:hover{border-color:var(--acc);background:rgba(212,162,74,.1)}

/* ---------- header tools: theme + language ---------- */
.tools{display:flex;align-items:center;gap:9px}
.tbtn{
  height:40px;min-width:40px;padding:0 11px;
  display:inline-flex;align-items:center;justify-content:center;
  background:transparent;border:1px solid var(--line);border-radius:10px;
  color:var(--mut);cursor:pointer;font:inherit;font-size:.8rem;font-weight:600;
  transition:color .2s,border-color .2s,background .2s,transform .2s var(--ease);
}
.tbtn:hover{color:var(--acc);border-color:var(--acc);background:rgba(212,162,74,.09)}
.tbtn:active{transform:scale(.94)}
.tbtn:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
.tbtn svg{width:18px;height:18px;fill:currentColor;display:block}
.tbtn.lang{white-space:nowrap}
/* sun in dark mode (click = go light), moon in light mode */
.i-moon{display:none}
:root[data-theme="light"] .i-moon{display:block}
:root[data-theme="light"] .i-sun{display:none}

.burger{display:none;background:none;border:0;cursor:pointer;padding:8px;width:42px}
.burger span{display:block;height:2px;background:var(--tx);margin:5px 0;border-radius:2px;transition:transform .3s var(--ease),opacity .2s}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- decorative orbs ---------- */
.orb{position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none;z-index:0}
.orb1{width:520px;height:520px;top:-160px;left:-140px;background:var(--orbA);animation:float 16s ease-in-out infinite}
.orb2{width:420px;height:420px;bottom:-180px;right:-120px;background:var(--orbB);animation:float 20s ease-in-out infinite reverse}
.orb3{width:460px;height:460px;top:50%;left:50%;margin:-230px 0 0 -230px;background:var(--orbC)}
@keyframes float{
  0%,100%{transform:translate(0,0) scale(1)}
  50%{transform:translate(40px,30px) scale(1.08)}
}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:88px 0 96px}
.hero-in{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center}
/* grid items default to min-width:auto, which lets a large image blow out
   its column — pin them to 0 so the track sizing is respected. */
.hero-in>*,.two>*,.ventures>*,.grid-3>*,.grid-4>*,.steps>*{min-width:0}
.eyebrow{
  color:var(--acc);letter-spacing:.2em;text-transform:uppercase;
  font-size:.7rem;font-weight:700;margin:0 0 20px;
}
.roles{font-size:clamp(1.05rem,2.4vw,1.4rem);font-weight:600;margin:0 0 20px;min-height:1.7em}
.role-static{color:var(--mut);font-weight:500}
.role-rotate{
  color:var(--acc);display:inline-block;
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.role-rotate.out{opacity:0;transform:translateY(-9px)}
.lead{color:var(--mut);font-size:1.06rem;max-width:560px}
.cta{display:flex;gap:13px;flex-wrap:wrap;margin-top:30px}
.center-cta{justify-content:center}
.btn{
  display:inline-block;padding:14px 28px;border-radius:10px;text-decoration:none;
  font-weight:600;font-size:.95rem;
  background:linear-gradient(135deg,var(--acc2),var(--acc));color:#0b0f14;
  border:1px solid transparent;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease);
}
.btn:hover{transform:translateY(-3px);box-shadow:0 12px 30px -10px rgba(212,162,74,.6)}
.btn.ghost{background:transparent;color:var(--tx);border-color:var(--line);box-shadow:none}
.btn.ghost:hover{border-color:var(--acc);color:var(--acc2);box-shadow:none}

.socials{display:flex;gap:12px;margin-top:32px}
.socials a{
  width:42px;height:42px;display:grid;place-items:center;border-radius:11px;
  border:1px solid var(--line);color:var(--mut);
  transition:color .2s,border-color .2s,transform .22s var(--ease);
}
.socials a:hover{color:var(--acc);border-color:var(--acc);transform:translateY(-3px)}
.socials svg{width:18px;height:18px;fill:currentColor}

.hero-img{position:relative}
.frame{
  border-radius:22px;overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(160deg,var(--card),var(--bg2));
  box-shadow:0 40px 80px -30px var(--sh);
}
/* height:auto is required — the img height attribute is a presentational
   hint that would otherwise override aspect-ratio. */
.frame img{width:100%;height:auto;aspect-ratio:1/1;object-fit:cover;object-position:center top}
.imgph{
  aspect-ratio:1/1;display:grid;place-content:center;gap:6px;text-align:center;
  color:var(--mut);padding:20px;
}
.imgph b{color:var(--tx);font-size:1rem}
.imgph span{font-size:.82rem}
.badge{
  position:absolute;right:-14px;bottom:-16px;
  background:linear-gradient(135deg,var(--acc2),var(--acc));color:#0b0f14;
  border-radius:15px;padding:15px 19px;display:flex;align-items:center;gap:11px;
  box-shadow:0 18px 36px -14px rgba(212,162,74,.75);
}
.badge b{font-size:1.85rem;font-weight:800;line-height:1}
.badge span{font-size:.72rem;font-weight:700;line-height:1.25;text-transform:uppercase;letter-spacing:.04em}

.scroll-hint{
  position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  width:24px;height:38px;border:2px solid var(--line);border-radius:13px;z-index:3;
}
.scroll-hint span{
  display:block;width:3px;height:7px;border-radius:2px;background:var(--acc);
  margin:7px auto 0;animation:wheel 1.7s infinite;
}
@keyframes wheel{0%{opacity:0;transform:translateY(0)}35%{opacity:1}100%{opacity:0;transform:translateY(15px)}}

/* ---------- stats ---------- */
.stats{border-block:1px solid var(--line);background:var(--bg2);padding:46px 0}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stats div{text-align:center}
.stats b{
  display:block;font-size:clamp(1.9rem,4vw,2.7rem);font-weight:800;
  background:linear-gradient(135deg,var(--acc2),var(--acc));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  font-variant-numeric:tabular-nums;line-height:1.1;
}
.stats span{color:var(--mut);font-size:.85rem;font-weight:500}

/* ---------- sections ---------- */
.sec{padding:104px 0;position:relative;overflow:hidden}
.sec.alt{background:var(--bg2)}
.tag{
  color:var(--acc);letter-spacing:.18em;text-transform:uppercase;
  font-size:.7rem;font-weight:700;margin:0 0 14px;
}
.sec-head{max-width:640px;margin:0 0 54px}
.center .sec-head,.narrow{margin-left:auto;margin-right:auto}
.sub{color:var(--mut);font-size:1.02rem;margin:0}

.two{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px}
.col-head{position:sticky;top:110px;align-self:start}
.col-body a{color:var(--acc);text-decoration:none;border-bottom:1px solid rgba(212,162,74,.35);transition:border-color .2s}
.col-body a:hover{border-bottom-color:var(--acc)}
.col-body p{color:var(--mut)}
.big-p{font-size:1.18rem;color:var(--tx)!important;font-weight:500}
.big-p strong{color:var(--acc2);font-weight:600}
.ticks{list-style:none;padding:0;margin:30px 0 0}
.ticks li{padding-left:30px;position:relative;margin-bottom:12px;color:var(--mut)}
.ticks li::before{
  content:"";position:absolute;left:0;top:.55em;width:14px;height:8px;
  border-left:2px solid var(--acc);border-bottom:2px solid var(--acc);
  transform:rotate(-45deg);
}

/* ---------- ventures ---------- */
.ventures{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.venture{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:30px;display:flex;flex-direction:column;
  transition:transform .3s var(--ease),border-color .3s,box-shadow .3s;
}
.venture:hover{transform:translateY(-6px);border-color:rgba(212,162,74,.45);box-shadow:0 26px 50px -24px var(--sh)}
.v-top{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.v-mark{
  width:50px;height:50px;flex:none;border-radius:13px;display:grid;place-items:center;
  font-weight:800;font-size:.85rem;letter-spacing:.02em;color:#0b0f14;
}
.m1{background:linear-gradient(135deg,#f0c274,#d4a24a)}
.m2{background:linear-gradient(135deg,#7fb4f5,#3d7fd6)}
.m3{background:linear-gradient(135deg,#8ee0b8,#3aa878)}
.venture h3{margin:0 0 2px}
.v-role{margin:0;color:var(--mut);font-size:.82rem;font-weight:500}
.v-line{color:var(--acc2);font-style:italic;font-size:.95rem;margin:0 0 12px}
.v-desc{color:var(--mut);font-size:.94rem}
.v-list{list-style:none;padding:0;margin:0 0 20px}
.v-list li{
  color:var(--mut);font-size:.9rem;padding:7px 0 7px 18px;position:relative;
  border-bottom:1px solid var(--line);
}
.v-list li:last-child{border-bottom:0}
.v-list li::before{content:"";position:absolute;left:0;top:1.05em;width:6px;height:6px;border-radius:50%;background:var(--acc)}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:22px}
.chips span{
  font-size:.72rem;font-weight:600;padding:5px 11px;border-radius:99px;
  background:var(--card2);border:1px solid var(--line);color:var(--mut);
}
.v-foot{margin-top:auto;padding-top:18px;border-top:1px solid var(--line)}
.v-nums{font-size:.83rem;color:var(--mut);margin-bottom:12px}
.v-nums b{color:var(--tx);font-weight:700}
.link{
  display:inline-flex;align-items:center;gap:7px;text-decoration:none;
  color:var(--acc);font-weight:600;font-size:.88rem;
}
.link span{transition:transform .25s var(--ease);display:inline-block}
.link:hover span{transform:translateX(5px)}

/* ---------- cards ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:28px;
  transition:transform .3s var(--ease),border-color .3s;
  position:relative;overflow:hidden;
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--acc),var(--acc2));
  transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease);
}
.card:hover{transform:translateY(-5px);border-color:rgba(212,162,74,.4)}
.card:hover::before{transform:scaleX(1)}
.card h3{margin-bottom:9px}
.card p{color:var(--mut);margin:0;font-size:.93rem}

/* ---------- approach ---------- */
.steps{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.step{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:30px 30px 30px 84px;position:relative;
  transition:border-color .3s,transform .3s var(--ease);
}
.step:hover{border-color:rgba(212,162,74,.4);transform:translateY(-4px)}
.num{
  position:absolute;left:28px;top:28px;font-size:1.5rem;font-weight:800;
  color:transparent;-webkit-text-stroke:1.5px var(--acc);letter-spacing:-.02em;
}
.step h3{margin-bottom:8px}
.step p{color:var(--mut);margin:0;font-size:.93rem}

/* ---------- contact ---------- */
.contact{background:var(--bg2);border-top:1px solid var(--line)}
.mail{margin:26px 0 4px}
.mail a{
  color:var(--acc);font-size:clamp(1.1rem,3vw,1.55rem);font-weight:700;
  text-decoration:none;border-bottom:2px solid rgba(212,162,74,.3);
  transition:border-color .25s;
}
.mail a:hover{border-bottom-color:var(--acc)}
.contact .socials{margin-top:26px}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:30px 0;color:var(--mut);font-size:.85rem;background:var(--bg)}
.foot-in{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.foot-in p{margin:0}
.foot-links{display:flex;gap:20px;flex-wrap:wrap}
.foot-links a{text-decoration:none;transition:color .2s}
.foot-links a:hover{color:var(--acc)}

/* ---------- reveal animations (JS-gated) ---------- */
.js-anim .sec,
.js-anim .stats,
.js-anim .reveal{
  opacity:0;transform:translateY(22px);
  transition:opacity .75s var(--ease),transform .75s var(--ease);
}
.js-anim .sec.in,
.js-anim .stats.in,
.js-anim .reveal.in{opacity:1;transform:none}
.js-anim .d1{transition-delay:.09s}
.js-anim .d2{transition-delay:.18s}
.js-anim .d3{transition-delay:.27s}
.js-anim .d4{transition-delay:.36s}
.js-anim .d5{transition-delay:.45s}

/* stagger children inside revealed sections */
.js-anim .sec.in .venture,
.js-anim .sec.in .card,
.js-anim .sec.in .step{animation:pop .6s var(--ease) both}
.js-anim .sec.in .venture:nth-child(2),
.js-anim .sec.in .card:nth-child(2),
.js-anim .sec.in .step:nth-child(2){animation-delay:.09s}
.js-anim .sec.in .venture:nth-child(3),
.js-anim .sec.in .card:nth-child(3),
.js-anim .sec.in .step:nth-child(3){animation-delay:.18s}
.js-anim .sec.in .card:nth-child(4),
.js-anim .sec.in .step:nth-child(4){animation-delay:.27s}
.js-anim .sec.in .card:nth-child(5){animation-delay:.36s}
.js-anim .sec.in .card:nth-child(6){animation-delay:.45s}
@keyframes pop{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}

/* ============================================================
   BANGLA TYPOGRAPHY
   Bengali script needs more line height, no letter-spacing and
   no uppercasing — Latin defaults look broken applied to it.
   ============================================================ */
html[lang="bn"] body{
  font-family:"Hind Siliguri","Plus Jakarta Sans",-apple-system,"Segoe UI",Roboto,sans-serif;
  line-height:1.85;
}
html[lang="bn"] h1,
html[lang="bn"] h2,
html[lang="bn"] h3{letter-spacing:0;line-height:1.35;font-weight:700}
html[lang="bn"] h1{font-size:clamp(2.1rem,5.6vw,3.9rem)}
html[lang="bn"] h2{font-size:clamp(1.55rem,3.6vw,2.35rem)}
html[lang="bn"] .eyebrow,
html[lang="bn"] .tag{text-transform:none;letter-spacing:.05em;font-size:.82rem}
html[lang="bn"] .brand-tx{font-size:1rem;letter-spacing:0}
html[lang="bn"] .lead,
html[lang="bn"] .sub{font-size:1.04rem}
html[lang="bn"] .stats span{font-size:.9rem}
html[lang="bn"] .v-line{font-style:normal;font-weight:600}
html[lang="bn"] .num{font-family:"Plus Jakarta Sans",sans-serif}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:960px){
  .hero-in{grid-template-columns:1fr;gap:48px}
  .hero-img{max-width:340px;margin:0 auto}
  .hero-tx{text-align:center}
  .lead{margin-left:auto;margin-right:auto}
  .cta,.socials{justify-content:center}
  .ventures,.grid-3{grid-template-columns:1fr}
  .two{grid-template-columns:1fr;gap:32px}
  .col-head{position:static}
  .scroll-hint{display:none}
}

@media (max-width:820px){
  .nav nav{
    display:none;position:absolute;top:72px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg2);border-bottom:1px solid var(--line);
    padding:10px 24px 20px;
  }
  .nav nav.open{display:flex;animation:pop .3s var(--ease) both}
  .nav nav a{padding:13px 0;border-bottom:1px solid var(--line);font-size:.96rem}
  .nav nav a:last-child{border-bottom:0;margin-top:12px;text-align:center}
  .nav nav a:not(.nav-cta)::after{display:none}
  .burger{display:block}
  .steps{grid-template-columns:1fr}
  .sec{padding:72px 0}
  .hero{padding:56px 0 72px}
  .foot-in{flex-direction:column;text-align:center}
}

@media (max-width:560px){
  .grid-4{grid-template-columns:repeat(2,1fr);row-gap:32px}
  .brand-tx{display:none}
  .tools{gap:6px}
  .tbtn{height:36px;min-width:36px;padding:0 9px;font-size:.75rem}
  .tbtn svg{width:16px;height:16px}
  .venture,.card,.step{padding:24px}
  .step{padding-left:24px;padding-top:60px}
  .num{top:22px;left:24px}
  .badge{right:0;bottom:-12px;padding:12px 15px}
  .badge b{font-size:1.5rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js-anim .sec,.js-anim .stats,.js-anim .reveal{opacity:1;transform:none;transition:none}
  .js-anim .sec.in .venture,.js-anim .sec.in .card,.js-anim .sec.in .step{animation:none}
  .orb,.scroll-hint span{animation:none}
  .btn:hover,.card:hover,.venture:hover,.step:hover,.socials a:hover{transform:none}
}