*{ box-sizing: border-box; }

:root{
  --light: #F4F1E4;
  --cardBlack: rgba(0,0,0,0.35);
  --btnMax: 0.25;
  --wrapW: 320px;
  --cardRadius: 14px;
  --btnW: 252px;
  --btnGap: 22px;
  --btnPadY: 11px;
  --iconSize: 98px;
  --iconBorder: 2px;
  --liftDown: 4vh;
}

body{
  margin:0;
  min-height:100vh;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;
  color: var(--light);
  background: url("bg.jpg") center/cover no-repeat fixed;
  display:flex;
  justify-content:center;
  align-items:center;
  padding: 32px 16px;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  background: radial-gradient(85% 65% at 50% 18%, rgba(0,0,0,.04), rgba(0,0,0,.55));
  pointer-events:none;
}

.wrap{
  position:relative;
  width: min(var(--wrapW), 92vw);
  margin: 0 auto;
  transform: translateY(var(--liftDown));
}

.card{
  position:relative;
  border: 1px solid rgba(244,241,228,1);
  border-radius: var(--cardRadius);
  background: var(--cardBlack);
  backdrop-filter: blur(2px);
  padding: 84px 22px 44px;
}

.avatar{
  position:absolute;
  top: calc(var(--iconSize) / -2 + 3px);
  left: 50%;
  transform: translateX(-50%);
  width: var(--iconSize);
  height: var(--iconSize);
  border-radius: 50%;
  border: var(--iconBorder) solid rgba(244,241,228,1);
  overflow:hidden;
  background: rgba(0,0,0,.35);
}

.avatar img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

.brand{
  text-align:center;
  font-size: 20px;
  letter-spacing: .28em;
  margin-top: 2px;
  opacity: .95;
}

.desc{
  text-align:center;
  font-size: 12.5px;
  line-height: 1.9;
  margin: 14px 0 26px;
  opacity: .88;
}

.links{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap: var(--btnGap);
}

.btn{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  width: min(var(--btnW), 78vw);
  padding: var(--btnPadY) 0;
  border-radius: 999px;
  border: 1px solid rgba(244,241,228,1);
  color: rgba(244,241,228,1);
  text-decoration:none;
  text-align:center;
  font-size: 13.5px;
  letter-spacing: .22em;
  background: linear-gradient(
    180deg,
    rgba(244,241,228,0.00) 0%,
    rgba(244,241,228,var(--btnMax)) 100%
  );
  box-shadow:
    inset 0 1px 0 rgba(244,241,228,0.08),
    inset 0 -1px 0 rgba(0,0,0,0.18);
  transition: transform .12s ease, box-shadow .18s ease, filter .18s ease;
}

.btn::after{
  content:"";
  position:absolute;
  top:-25%;
  left:-60%;
  width:55%;
  height:150%;
  pointer-events:none;
  background: linear-gradient(
    90deg,
    rgba(244,241,228,0) 0%,
    rgba(244,241,228,0.14) 45%,
    rgba(244,241,228,0.36) 50%,
    rgba(244,241,228,0.14) 55%,
    rgba(244,241,228,0) 100%
  );
  transform: skewX(-18deg);
  opacity: 0;
  filter: blur(9px);
  mix-blend-mode: screen;
}

.btn:hover{
  filter: brightness(1.06);
}

.btn:hover::after{
  opacity: .9;
  animation: mistSweep .85s ease-out 1;
}

@keyframes mistSweep{
  from { left:-60%; }
  to   { left:120%; }
}

.btn:active{
  transform: scale(0.985);
  box-shadow:
    0 0 0 2px rgba(244,241,228,0.30),
    0 0 18px rgba(244,241,228,0.20),
    0 0 42px rgba(244,241,228,0.10),
    inset 0 1px 0 rgba(244,241,228,0.10),
    inset 0 -1px 0 rgba(0,0,0,0.18);
}

.footer{
  margin-top: 34px;
  text-align:center;
  font-size: 12px;
  opacity: .70;
}

@media (min-width: 900px){
  .wrap{ width: var(--wrapW); }
}

@media (prefers-reduced-motion: reduce){
  .btn:hover::after{ animation:none; }
}