:root{
  --bg1:#05060a;
  --bg2:#0b1220;
  --fg:rgba(255,255,255,.92);
  --muted:rgba(235,245,255,.70);
  --glass:rgba(255,255,255,.075);
  --glass-strong:rgba(255,255,255,.14);
  --stroke:rgba(255,255,255,.18);
  --shadow:
    0 20px 70px rgba(0,0,0,.58),
    0 10px 28px rgba(0,0,0,.28);
  --accent:#0a84ff;
  --accent2:#64d2ff;
  --ice:#0a84ff;
  --ice2:#64d2ff;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  position:relative;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  color:var(--fg);
  overflow:hidden;
  background-color: var(--bg1);
  background-image:
    radial-gradient(1100px 900px at 20% 10%, rgba(10,132,255,.18), transparent 62%),
    radial-gradient(950px 760px at 86% 18%, rgba(100,210,255,.12), transparent 60%),
    radial-gradient(1200px 900px at 50% 120%, rgba(10,132,255,.10), transparent 55%),
    linear-gradient(145deg, rgba(3,7,18,.65), rgba(7,26,51,.70)),
    url("assets/winter.jpg");
  background-size: auto, auto, auto, auto, cover;
  background-position: 0 0, 0 0, 0 0, 0 0, center;
  background-repeat: no-repeat;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(900px 520px at 50% -10%, rgba(255,255,255,.10), transparent 62%),
    radial-gradient(1100px 700px at 50% 115%, rgba(255,255,255,.08), transparent 60%),
    repeating-linear-gradient(135deg, rgba(255,255,255,.035) 0 1px, transparent 1px 10px);
  opacity:.38;
  mix-blend-mode:overlay;
}

body::after{
  content:"";
  position:fixed;
  inset:-10vh -10vw;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(900px 520px at 30% 70%, rgba(255,255,255,.08), transparent 60%),
    radial-gradient(1100px 680px at 75% 78%, rgba(255,255,255,.06), transparent 62%),
    radial-gradient(1200px 760px at 55% 92%, rgba(255,255,255,.05), transparent 65%);
  filter: blur(14px);
  opacity:.6;
}

.scenery{
  position:fixed;
  left:0;
  right:0;
  bottom:-1px;
  height: 56vh;
  z-index:1;
  pointer-events:none;
  opacity:.9;
  filter: blur(.15px) saturate(105%);
}

.scenery-svg{
  width:100%;
  height:100%;
  display:block;
}

#snow, #fireworks{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  display:block;
  pointer-events:none;
}

#snow{opacity:.95; z-index:3}
#fireworks{opacity:1; z-index:6}

.stage{
  position:relative;
  z-index:4;
  min-height:100vh;
  padding: clamp(18px, 4vw, 48px);
  display:flex;
  align-items:center;
  justify-content:center;
}

.glass{
  width:min(900px, 92vw);
  background: linear-gradient(180deg, rgba(255,255,255,.22), rgba(255,255,255,.10));
  border: 1px solid var(--stroke);
  border-radius: 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(58px) saturate(105%) brightness(1.08);
  -webkit-backdrop-filter: blur(58px) saturate(105%) brightness(1.08);
  padding: clamp(18px, 3.2vw, 30px);
  position:relative;
  overflow:hidden;
  transform: translateZ(0);
}

.glass::before{
  content:"";
  position:absolute;
  inset:-2px;
  background:
    radial-gradient(620px 220px at 18% 0%, rgba(255,255,255,.22), transparent 62%),
    radial-gradient(720px 300px at 88% 0%, rgba(100,210,255,.20), transparent 64%),
    radial-gradient(1200px 520px at 50% 115%, rgba(255,255,255,.07), transparent 60%);
  filter: blur(3px);
  pointer-events:none;
}

.glass::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  border-radius: 32px;
  background:
    radial-gradient(220px 170px at 0% 0%, rgba(255,255,255,.18), transparent 62%),
    radial-gradient(240px 180px at 100% 0%, rgba(100,210,255,.14), transparent 64%),
    radial-gradient(260px 200px at 0% 100%, rgba(255,255,255,.12), transparent 66%),
    radial-gradient(280px 220px at 100% 100%, rgba(255,255,255,.12), transparent 66%),
    radial-gradient(1200px 520px at 50% -10%, rgba(255,255,255,.12), transparent 62%),
    radial-gradient(900px 520px at 50% 120%, rgba(0,0,0,.22), transparent 62%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.032) 0 1px, rgba(255,255,255,0) 1px 7px),
    repeating-linear-gradient(90deg, rgba(255,255,255,.020) 0 1px, rgba(255,255,255,0) 1px 9px);
  opacity:.95;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.20),
    inset 0 -1px 0 rgba(0,0,0,.16),
    inset 0 0 0 1px rgba(255,255,255,.06);
}

.header{
  position:relative;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
}

.kicker{
  letter-spacing:.12em;
  text-transform:uppercase;
  font-size:11px;
  color:var(--muted);
}

.title{
  margin:.35rem 0 0;
  font-size: clamp(26px, 4vw, 42px);
  line-height:1.1;
  letter-spacing: -0.012em;
}

.title .accent{
  font-size: clamp(40px, 6.2vw, 68px);
  font-weight:800;
  letter-spacing: -0.02em;
  display:inline-block;
  transform: translateY(1px);
}

.accent{
  background: linear-gradient(90deg, var(--ice), var(--ice2));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.badge{
  position:relative;
  padding:10px 12px;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.18);
  background:
    radial-gradient(220px 90px at 50% 0%, rgba(255,255,255,.12), rgba(255,255,255,0) 70%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.030) 0 1px, rgba(255,255,255,0) 1px 7px),
    rgba(255,255,255,.12);
  backdrop-filter: blur(34px) saturate(105%) brightness(1.08);
  -webkit-backdrop-filter: blur(34px) saturate(105%) brightness(1.08);
  color: rgba(255,255,255,.86);
  font-variant-numeric: tabular-nums;
  font-size:12px;
  font-weight:600;
  letter-spacing: -0.01em;
  min-width: 210px;
  text-align:right;
}

.countdown{
  position:relative;
  display:flex;
  align-items:stretch;
  justify-content:center;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 28px);
  padding: clamp(14px, 2.3vw, 20px);
  border-radius: 26px;
  border: 1px solid rgba(255,255,255,.16);
  background:
    radial-gradient(520px 220px at 30% 0%, rgba(255,255,255,.11), rgba(255,255,255,0) 70%),
    radial-gradient(520px 220px at 70% 0%, rgba(100,210,255,.08), rgba(255,255,255,0) 72%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.028) 0 1px, rgba(255,255,255,0) 1px 7px),
    rgba(255,255,255,.12);
  backdrop-filter: blur(34px) saturate(105%) brightness(1.08);
  -webkit-backdrop-filter: blur(34px) saturate(105%) brightness(1.08);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.14),
    inset 0 -1px 0 rgba(0,0,0,.20);
}

.unit{
  width: min(160px, 18vw);
  text-align:center;
}

.num{
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 6vw, 56px);
  font-weight:700;
  letter-spacing:.02em;
  text-shadow: 0 1px 18px rgba(0,0,0,.25);
}

.label{
  margin-top:6px;
  font-size:12px;
  color: var(--muted);
}

.sep{
  display:flex;
  align-items:center;
  justify-content:center;
  font-size: clamp(22px, 4.2vw, 34px);
  color: rgba(233,238,255,.55);
  padding-top: 4px;
  user-select:none;
}

.sub{
  position:relative;
  margin-top: 14px;
  color: rgba(233,238,255,.85);
  text-align:center;
}

.controls{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  justify-content:center;
  margin-top: 18px;
}

.btn{
  appearance:none;
  border:1px solid rgba(255,255,255,.16);
  background:
    radial-gradient(200px 80px at 50% 0%, rgba(255,255,255,.12), rgba(255,255,255,0) 68%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.026) 0 1px, rgba(255,255,255,0) 1px 7px),
    rgba(255,255,255,.12);
  color: rgba(233,238,255,.92);
  border-radius: 999px;
  padding: 10px 16px;
  cursor:pointer;
  font-weight:600;
  letter-spacing:.01em;
  font-size:14px;
  line-height:1.1;
  position:relative;
  overflow:hidden;
  user-select:none;
  box-shadow:
    0 10px 26px rgba(0,0,0,.22),
    inset 0 1px 0 rgba(255,255,255,.16);
  backdrop-filter: blur(30px) saturate(105%) brightness(1.08);
  -webkit-backdrop-filter: blur(30px) saturate(105%) brightness(1.08);
  transition: transform .08s ease, background .2s ease, border-color .2s ease, opacity .2s ease, box-shadow .2s ease;
}

.btn::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background: linear-gradient(180deg, rgba(255,255,255,.22), rgba(255,255,255,0) 60%);
  opacity:0;
  transition: opacity .2s ease;
}

.btn:hover{transform: translateY(-1px); border-color: rgba(255,255,255,.22); background: rgba(255,255,255,.12)}
.btn:active{transform: translateY(0px) scale(.98); box-shadow: 0 6px 18px rgba(0,0,0,.22), inset 0 1px 0 rgba(255,255,255,.12)}
.btn:disabled{opacity:.5; cursor:not-allowed}

.btn:hover::after{opacity:.55}
.btn:active::after{opacity:.20}

.btn:focus-visible{
  outline: none;
  box-shadow:
    0 10px 26px rgba(0,0,0,.22),
    0 0 0 4px rgba(10,132,255,.22),
    inset 0 1px 0 rgba(255,255,255,.16);
}

.btn.primary{
  border-color: rgba(255,255,255,.14);
  background: linear-gradient(180deg, rgba(10,132,255,.80), rgba(100,210,255,.46));
  box-shadow:
    0 18px 42px rgba(10,132,255,.18),
    0 10px 26px rgba(0,0,0,.22),
    inset 0 1px 0 rgba(255,255,255,.20);
  color: rgba(255,255,255,.96);
}

.dot{
  display:inline-block;
  width:8px;
  height:8px;
  border-radius:999px;
  background: rgba(233,238,255,.65);
  margin-right:8px;
  vertical-align:middle;
  box-shadow: 0 0 0 0 rgba(121,200,255,.0);
}

.btn.primary.is-playing .dot{
  background: rgba(48,209,88,.92);
  box-shadow: 0 0 0 6px rgba(48,209,88,.10);
}

.hint{
  position:relative;
  margin-top: 14px;
  font-size: 12px;
  color: rgba(233,238,255,.75);
  text-align:center;
}

.hint code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
  color: rgba(233,238,255,.9);
  background: rgba(0,0,0,.22);
  border: 1px solid rgba(255,255,255,.14);
  padding: 2px 6px;
  border-radius: 8px;
}

.footer{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  padding: 12px 18px;
  pointer-events:none;
}

.footer-inner{
  display:flex;
  justify-content:space-between;
  gap:10px;
  color: rgba(233,238,255,.55);
  font-size:12px;
}

@media (max-width: 520px){
  .badge{min-width:unset; text-align:left}
  .footer-inner{flex-direction:column; align-items:flex-start}
  .countdown{gap:8px}
  .unit{width: 21vw}
}