*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#1a0b2e 0%,#0a0a2a 50%,#2a0a2e 100%);color:#fff;overflow-x:hidden;min-height:100vh}

.sky{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.bless{position:absolute;white-space:nowrap;font-size:15px;padding:6px 14px;border-radius:20px;background:rgba(255,255,255,.14);color:#ffe4f0;text-shadow:0 0 8px rgba(255,150,190,.8);border:1px solid rgba(255,190,215,.35);animation:fall linear forwards;will-change:transform,opacity}
.bless::before{content:"🌸 ";font-size:13px}
@keyframes fall{
  0%{transform:translateY(-8vh) translateX(0) rotate(0deg);opacity:0}
  10%{opacity:1}
  50%{transform:translateY(52vh) translateX(var(--drift)) rotate(180deg)}
  90%{opacity:1}
  100%{transform:translateY(108vh) translateX(calc(var(--drift) * -1)) rotate(360deg);opacity:0}
}

.center{text-align:center;padding:70px 20px 20px;position:relative;z-index:1}
#title{font-size:clamp(28px,6vw,56px);min-height:1.4em;color:#ffd6e8;text-shadow:0 0 18px rgba(255,140,180,.7)}
.sub{margin-top:16px;font-size:18px;opacity:.85}

.letter{max-width:640px;margin:40px auto;padding:28px;background:rgba(255,255,255,.12);border-radius:16px;line-height:1.9;position:relative;z-index:1;backdrop-filter:blur(4px)}
.letter h2{color:#ffd6e8;margin-bottom:12px}
.sign{margin-top:16px;font-weight:bold;color:#ffb3d1}

#musicBtn{position:fixed;right:20px;bottom:20px;z-index:10;padding:11px 20px;border:none;border-radius:24px;background:#ff6b9d;color:#fff;cursor:pointer;font-size:14px;box-shadow:0 4px 16px rgba(255,107,157,.5)}
.firework{position:fixed;pointer-events:none;border-radius:50%;z-index:5}