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

/* ব্যাকগ্রাউন্ড ক্যাশিং ফিক্সড */
body {
  background: #f9e9f2 url("assets/birthday-bg.jpg?v=2") center/cover fixed no-repeat;
  color: #3b3040;
}

button{font:inherit}
.app-shell{position:relative;width:100%;height:100%;max-width:480px;margin:auto;overflow:hidden}

/* ট্রানজিশনের সময় ব্লার ঠিক রাখার জন্য GPU Rendering ফিক্স */
.page{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:26px;
  opacity:0;
  pointer-events:none;
  transform:translateX(28px) scale(.985) translateZ(0);
  transition:opacity .42s ease,transform .42s ease;
  will-change: transform, opacity;
}
.page.active{
  opacity:1;
  pointer-events:auto;
  transform:translateX(0) scale(1) translateZ(0);
}

/* গ্লাস কার্ড - অ্যানিমেশন ও পেইজ চেঞ্জের সময়ও সবসময় স্থায়ী ব্লার থাকবে */
.glass-card {
  width: 100%;
  max-height: calc(100vh - 90px);
  overflow: auto;
  padding: 30px 22px 24px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.35) !important; /* ট্রানজিশনে ট্রান্সপারেন্ট না হওয়ার জন্য সেমি-সলিড বেস */
  -webkit-backdrop-filter: blur(25px) saturate(180%) !important;
  backdrop-filter: blur(25px) saturate(180%) !important;
  border-radius: 28px;
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.12);
  text-align: center;
  transform: translateZ(0);
  will-change: backdrop-filter;
}
.glass-card::-webkit-scrollbar{width:0}

.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:2px;font-weight:800;opacity:.75;margin:4px 0 12px}
h1{font-size:34px;line-height:1.12;margin:8px 0 16px}
h2{font-size:25px;margin:8px 0 16px}
.text{font-size:15px;line-height:1.7;opacity:.88;margin:10px auto 22px;max-width:340px}
.gift-icon,.emoji-big{font-size:72px;line-height:1;margin:8px 0 18px;filter:drop-shadow(0 8px 12px rgba(0,0,0,.15))}

.date-pill{
  display:inline-flex;
  gap:7px;
  align-items:center;
  padding:9px 15px;
  border-radius:999px;
  background:rgba(255,255,255,.25);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.4);
  font-size:13px;
  font-weight:700;
  margin-bottom:4px
}

.primary,.secondary{width:100%;border:0;border-radius:16px;padding:14px 18px;font-weight:800;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}
.primary{background:rgba(255,255,255,.9);color:#512d4a;box-shadow:0 10px 25px rgba(0,0,0,.12)}
.secondary{background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.5);color:#512d4a}
.primary:active,.secondary:active{transform:scale(.97)}

.letter{
  font-size:15px;
  line-height:1.85;
  text-align:left;
  background:rgba(255,255,255,.2);
  -webkit-backdrop-filter:blur(15px);
  backdrop-filter:blur(15px);
  border:1px solid rgba(255,255,255,.35);
  border-radius:20px;
  padding:18px;
  margin:0 0 20px
}
.letter strong{display:block;margin-top:12px}

.wish-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 20px}
.wish-card{
  background:rgba(255,255,255,.2);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.4);
  border-radius:18px;
  padding:15px 10px;
  display:flex;
  flex-direction:column;
  gap:7px;
  font-size:26px
}
.wish-card b{font-size:13px}.wish-card span{font-size:11px;line-height:1.45;opacity:.8}

.cake{height:150px;position:relative;margin:8px auto 2px;width:210px}
.cake-body{position:absolute;bottom:12px;left:25px;width:160px;height:70px;border-radius:12px 12px 22px 22px;background:rgba(255,255,255,.85);box-shadow:inset 0 -14px 0 rgba(255,190,215,.65)}
.cake-top{position:absolute;bottom:65px;left:17px;width:176px;height:30px;border-radius:50%;background:#fff;box-shadow:0 8px 0 rgba(255,190,215,.7)}
.candle{position:absolute;z-index:2;bottom:83px;left:99px;width:12px;height:40px;border-radius:5px;background:#f4b5cc}
.flame{position:absolute;z-index:3;bottom:119px;left:91px;font-size:26px;transition:all .25s}
.flame.off{opacity:0;transform:translateY(-20px) scale(.5)}
.wish-done{font-weight:800}

.final-line{
  font-weight:800;
  font-size:14px;
  margin:16px 0 22px;
  padding:13px;
  border-radius:15px;
  background:rgba(255,255,255,.2);
  border:1px solid rgba(255,255,255,.35)
}

.progress{position:absolute;z-index:10;bottom:18px;left:50%;transform:translateX(-50%);display:flex;gap:6px}
.dot{width:7px;height:7px;border-radius:50%;background:rgba(90,65,85,.22);transition:.25s}
.dot.active{width:20px;border-radius:99px;background:rgba(90,65,85,.62)}

@media (max-height:680px){
  .page{padding:16px}
  .glass-card{padding:20px 18px}
  .gift-icon,.emoji-big{font-size:54px;margin-bottom:12px}
  h1{font-size:29px}
  .text{margin-bottom:14px}
}

.thanks-box{
  margin-top:18px;
  padding:18px 14px;
  border-radius:22px;
  background:rgba(255,255,255,.2);
  -webkit-backdrop-filter:blur(15px);
  backdrop-filter:blur(15px);
  border:1px solid rgba(255,255,255,.4)
}
.thanks-box h2{font-size:20px;margin:0 0 7px}
.thanks-subtext{font-size:12px;opacity:.75;margin:0 0 15px}
.choice-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.choice{border:0;border-radius:15px;padding:13px 10px;font-weight:800;cursor:pointer}
.choice:disabled{opacity:.55}
.choice.yes{background:rgba(255,255,255,.9);color:#c34d78}
.choice.no{background:rgba(255,255,255,.25);color:#512d4a;border:1px solid rgba(255,255,255,.4)}
.response-message{min-height:20px;font-size:13px;font-weight:700;margin:14px 0 0}
.response-message.success{color:#b94370}
.response-message.neutral{color:#6d6170}