:root {
  --bg-1: #01060f;
  --bg-2: #020b18;
  --bg-3: #031524;
  --bg-4: #020913;
  --card: rgba(255,255,255,0.03);
  --card-border: rgba(255,255,255,0.1);
  --text: #ffffff;
  --muted: rgba(255,255,255,0.62);
  --cyan: #22d3ee;
  --amber: #fbbf24;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, rgba(59,130,246,0.12), transparent 22%),
    radial-gradient(circle at 80% 10%, rgba(34,197,94,0.08), transparent 20%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 30%, var(--bg-3) 60%, var(--bg-4) 100%);
}
.site-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 20%, rgba(255,255,255,0.04), transparent 30%);
}
.container { width: min(1200px, calc(100% - 48px)); margin: 0 auto; }
.topbar {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(2, 9, 19, 0.55);
}

.hero-logo {
  text-align: center;
  margin-bottom: 10px;
}

.hero-logo img {
  width: 280px;   /* adjust korte paro */
  height: 200;
  opacity: 0.9;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
  color: #22d3ee;
}

.logo-area img {
  width: 80px;   /* small & clean */
  height: auto;
}

.nav-wrap { display:flex; align-items:center; justify-content:space-between; padding: 14px 0; }
.brand { color: var(--cyan); text-decoration:none; font-size: 24px; font-weight: 600; letter-spacing:-.04em; }
.nav { display:flex; gap: 24px; }
.nav a { color: rgba(255,255,255,0.76); text-decoration:none; font-size: 20px; transition: .25s; }
.nav a:hover { color: var(--cyan); }
.btn { display:inline-flex; align-items:center; justify-content:center; text-decoration:none; border-radius:999px; transition:.28s ease; }
.btn-primary { background: var(--cyan); color: #03141d; font-weight: 800; box-shadow: 0 0 40px rgba(34,211,238,.24); }
.btn-primary:hover { transform: translateY(-2px) scale(1.03); box-shadow: 0 0 55px rgba(34,211,238,.35); }
.btn-secondary { border: 1px solid rgba(255,255,255,.15); color: rgba(255,255,255,.9); background: rgba(255,255,255,.04); }
.btn-secondary:hover { border-color: rgba(34,211,238,.45); }
.btn-sm { padding: 18px 34px; font-size: 18px; }
.hero { position: relative; min-height: 100vh; overflow: hidden; }
.hero::before {
  content:""; position:absolute; inset:0;
  background:
    radial-gradient(circle at top, rgba(34,197,94,0.25), transparent 30%),
    radial-gradient(circle at center, rgba(59,130,246,0.15), transparent 40%),
    linear-gradient(180deg, #02121f 0%, #042b3f 50%, #001018 100%);
}
.hero-glow { position:absolute; border-radius:999px; filter: blur(72px); }
.hero-glow-1 { top:-70px; left:50%; transform:translateX(-50%); width:1400px; height:420px; background: linear-gradient(to right, rgba(59,130,246,.2), rgba(74,222,128,.2), rgba(251,146,60,.2)); animation: pulse 8s ease-in-out infinite; }
.hero-glow-2 { left:50%; top:8%; transform:translateX(-50%); width:1500px; height:900px; background: radial-gradient(ellipse at center, rgba(21,43,74,.3) 0%, rgba(10,20,38,.78) 45%, rgba(2,6,17,1) 72%); }
.hero-glow-3 { left:50%; top:10%; transform:translateX(-50%); width:1350px; height:780px; background: radial-gradient(ellipse at 50% 20%, rgba(35,209,198,.12), transparent 32%), radial-gradient(ellipse at 30% 75%, rgba(255,255,255,.08), transparent 18%), radial-gradient(ellipse at 65% 68%, rgba(255,255,255,.06), transparent 16%), radial-gradient(ellipse at 45% 55%, rgba(24,92,122,.25), transparent 35%); animation: float 10s ease-in-out infinite; }
.hero-inner { position:relative; z-index:1; min-height: calc(100vh - 82px); display:flex; flex-direction:column; justify-content:center; align-items:center; text-align:center; padding: 54px 0 80px; }
.eyebrow { margin:0; font-size: 17px; font-weight: 600; letter-spacing: .25em; text-transform: uppercase; }
.eyebrow.cyan { color: var(--cyan); }
.eyebrow.amber { color: var(--amber); }
h1 { margin: 18px 0 0; font-size: clamp(68px, 13vw, 170px); line-height: .95; font-weight: 900; letter-spacing: -.06em; color: var(--cyan); }
h2 { margin: 18px 0 0; font-size: clamp(42px, 7vw, 88px); line-height: .98; font-weight: 800; letter-spacing: -.05em; text-align:center; }
h3 { margin: 0; font-size: 32px; line-height: 1.18; font-weight: 800; }
h4 { margin: 24px 0 10px; font-size: 15px; letter-spacing: .08em; text-transform: uppercase; color: var(--cyan); }
p { margin: 0; }
.hero-copy, .section-sub { max-width: 980px; margin: 26px auto 0; color: var(--muted); font-size: clamp(20px, 2vw, 34px); line-height: 1.55; }
.section-sub { max-width: 860px; font-size: clamp(18px, 1.4vw, 28px); }
.hero-actions { display:flex; gap: 18px; flex-wrap:wrap; justify-content:center; margin-top: 36px; }
.hero-actions .btn { padding: 20px 42px; font-size: 26px; font-weight: 800; }
.hero-highlights { width:100%; display:grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 56px; }
.pill { display:flex; align-items:center; text-align: center; gap: 12px; padding: 8px 14px; border-radius: 999px; background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.1); box-shadow: 0 10px 40px rgba(0,0,0,.25); text-align:left; color: rgba(255,255,255,.92); font-size: 20px; }
.scroll-down { margin-top: 46px; color: rgba(255,255,255,.5); font-size: 42px; animation: bounce 1.8s infinite; }
.section { padding: 72px 0 100px; }
.about-panel {
  position:relative; overflow:hidden; border-radius: 36px; padding: 64px 40px 48px;
  border: 1px solid rgba(255,255,255,.1);
  background: linear-gradient(135deg, rgba(4,18,32,.95), rgba(3,28,44,.88) 50%, rgba(6,40,38,.75));
  box-shadow: 0 30px 90px rgba(0,0,0,.28);
}

.bangla {
  font-family: 'Noto Sans Bengali', sans-serif;
  letter-spacing: 0; 
  font-size: 34px;
  word-spacing: 2px;
  font-weight: 600;
  line-height: 1.4;
}

.hero-title {
  font-weight: 800;

  background: linear-gradient(
    90deg,
    #1d4ed8 0%,   /* blue start */
    #22d3ee 25%,  /* cyan */
    #22c55e 45%,  /* green (middle start) */
    #FFAE42 60%,  /* orange (middle) */
    #22c55e 75%,  /* green abar */
    #22d3ee 90%   /* orange end */
  );

  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
}

.orb { position:absolute; border-radius:999px; filter: blur(60px); }
.orb-left { left:-70px; top:40px; width:220px; height:220px; background: rgba(34,211,238,.12); }
.orb-right { right:0; top:0; width:260px; height:260px; background: rgba(59,130,246,.12); }
.orb-bottom { bottom:0; left:50%; transform:translateX(-50%); width:320px; height:160px; background: rgba(74,222,128,.1); }
.lead-copy { position:relative; z-index:1; max-width: 980px; margin: 34px auto 0; text-align:center; color: rgba(255,255,255,.58); font-size: clamp(19px, 2vw, 32px); line-height: 1.75; display:grid; gap: 18px; }
.grid { display:grid; gap: 24px; }
.four-grid { grid-template-columns: repeat(4, 1fr); margin-top: 56px; }
.three-grid { grid-template-columns: repeat(3, 1fr); }
.two-grid { grid-template-columns: repeat(2, 1fr); }
.five-grid { grid-template-columns: repeat(5, 1fr); }
.mt-lg { margin-top: 56px; }
.mt-xl { margin-top: 88px; }
.mt-md { margin-top: 34px; }
.card {
  position:relative; border-radius: 30px; padding: 34px;
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(16px);
  box-shadow: 0 25px 80px rgba(0,0,0,.45);
  transition: transform .28s ease, border-color .28s ease, box-shadow .28s ease;
}
.card:hover { transform: translateY(-8px); border-color: rgba(34,211,238,.25); }
.card-topline::before {
  content:""; position:absolute; left:0; right:0; top:0; height:1px;
  background: linear-gradient(to right, transparent, rgba(34,211,238,.6), transparent);
}
.card p, .impact-item p, .mentor-card p { margin-top: 4px; color: rgba(255,255,255,.54); font-size: 22px; line-height: 1.65; }
.big-card ul { margin: 14px 0 0; padding-left: 0; list-style: none; display:grid; gap: 12px; color: rgba(255,255,255,.78); font-size: 22px; }
.big-card li::before { content: "•"; color: var(--cyan); margin-right: 10px; }
.big-card .ghost-no { position:absolute; right:24px; top:20px; font-size: 88px; font-weight: 800; color: rgba(255,255,255,.05); }
.center-card, .mentor-card, .impact-item { text-align:center; }
.icon-badge, .avatar {
  width: 56px; height:56px; display:inline-flex; align-items:center; justify-content:center;
  border-radius: 18px; background: rgba(34,211,238,.1); color: var(--cyan); font-size: 28px;
}
.icon-badge.lg, .avatar.lg { width: 80px; height:80px; border-radius: 24px; font-size: 40px; }
.amber-badge { background: rgba(251,191,36,.1); color: var(--amber); }
.avatar { border-radius: 999px; }
.timeline { position:relative; max-width: 1040px; margin-inline:auto; }
.timeline .line { position:absolute; left:50%; top:0; bottom:0; width:1px; background: rgba(255,255,255,.15); transform: translateX(-50%); }
.timeline-item { position:relative; width:50%; padding: 28px 72px; }
.timeline-item.left { text-align:right; margin-right:auto; }
.timeline-item.right { text-align:left; margin-left:auto; }
.timeline-item .date { color: var(--amber); font-size: 34px; font-weight: 800; letter-spacing: .02em; }
.timeline-item h3 { margin-top: 10px; font-size: 42px; }
.timeline-item .dot {
  position:absolute; top:50%; width:16px; height:16px; border-radius:999px; background: var(--cyan);
  box-shadow: 0 0 20px rgba(45,212,191,.55); transform: translateY(-50%);
}
.timeline-item.left .dot, .timeline-item.right .dot { right: -8px; }
.timeline-item.right .dot { left: -8px; right: auto; }
.deadline { margin-top: 44px; text-align:center; color: rgba(255,255,255,.55); font-size: 28px; }
.deadline span, .amber-strong { color: var(--amber); font-weight: 700; }
.prize-card { border-color: rgba(34,211,238,.4); box-shadow: 0 0 40px rgba(45,212,191,.25); text-align:center; }
.prize-title { margin-top: 18px; color: rgba(255,255,255,.5); font-size: 18px; letter-spacing: .08em; text-transform: uppercase; font-weight: 700; }
.prize-amount { margin-top: 12px; font-size: 58px; color: var(--cyan); }
.impact-item h3 { margin-top: 18px; }
.center-text { text-align:center; }
.cta-btn { margin-top: 34px; padding: 24px 48px; font-size: 28px; }
.tiny-note { margin-top: 22px; font-size: 18px; color: rgba(255,255,255,.5); }
.partner-grid { display:flex; flex-wrap:wrap; gap: 26px; justify-content:center; }
.partner-box {
  height: 84px; min-width: 180px; padding: 0 26px; border-radius: 18px; background:#fff; color:#111;
  display:flex; align-items:center; justify-content:center; font-weight: 700; box-shadow: 0 10px 24px rgba(0,0,0,.25);
}
.footer { border-top: 1px solid rgba(255,255,255,.1); padding: 32px 0 46px; text-align:center; }
.footer h3 { font-size: 30px; }
.footer p { margin-top: 10px; color: rgba(255,255,255,.5); font-size: 18px; }
.reveal, .reveal-item { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible, .reveal-item.visible { opacity: 1; transform: translateY(0); }
@keyframes pulse { 0%,100% { opacity:.75; transform:translateX(-50%) scale(1); } 50% { opacity:1; transform:translateX(-50%) scale(1.05); } }
@keyframes float { 0%,100% { transform:translateX(-50%) translateY(0); } 50% { transform:translateX(-50%) translateY(-10px); } }
@keyframes bounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(8px); } }
@media (max-width: 1100px) {
  .nav { display:none; }
  .four-grid, .three-grid { grid-template-columns: repeat(2, 1fr); }
  .five-grid { grid-template-columns: repeat(3, 1fr); }
  .hero-highlights { grid-template-columns: 1fr; }
  .timeline-item h3 { font-size: 34px; }
}
@media (max-width: 780px) {
  .container { width: min(1200px, calc(100% - 28px)); }
  .brand { font-size: 32px; }
  .btn-sm { padding: 14px 22px; font-size: 16px; }
  .section { padding: 54px 0 76px; }
  .about-panel { padding: 42px 18px 28px; border-radius: 24px; }
  .four-grid, .three-grid, .two-grid, .five-grid { grid-template-columns: 1fr; }
  .card p, .impact-item p, .mentor-card p { font-size: 18px; }
  .timeline .line { left: 8px; transform:none; }
  .timeline-item { width:100%; padding: 0 0 28px 34px; text-align:left !important; }
  .timeline-item .dot { left: 1px !important; right:auto !important; }
  .timeline-item .date { font-size: 24px; }
  .timeline-item h3 { font-size: 28px; }
  .prize-amount { font-size: 46px; }
}