:root{

  --bg:#120909;
  --card:#1d1010;
  --card2:#241212;
  --soft:#2b1717;
  --soft2:#2a1515;
  --border:#4a1f1f;
  --text:#ffffff;
  --muted:#ffbcbc;
  --accent:#ff4d4d;
  --accent2:#ff5c5c;
  --green:#35d07f;
  --shadow:rgba(255,0,0,0.15);
}

body.light{

  --bg:#f3f3f3;
  --card:#ffffff;
  --card2:#fafafa;
  --soft:#f2f2f2;
  --soft2:#f7f7f7;
  --border:#dddddd;
  --text:#151515;
  --muted:#666666;
  --accent:#ff3b3b;
  --accent2:#e22d2d;
  --green:#1ca75d;
  --shadow:rgba(0,0,0,0.08);
}

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family:Arial,sans-serif;
}

body{
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  padding:30px;
  transition:0.25s;
}

.container{
  width:100%;
  max-width:720px;
  background:var(--card);
  border-radius:24px;
  padding:25px;
  border:1px solid var(--border);
  box-shadow:0 0 40px var(--shadow);
  transition:0.25s;
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:25px;
}

.title{
  font-size:32px;
  font-weight:bold;
  color:var(--accent2);
}

.theme-toggle{
  border:none;
  background:var(--soft);
  color:var(--text);
  padding:12px 16px;
  border-radius:12px;
  cursor:pointer;
  font-weight:bold;
  border:1px solid var(--border);
  transition:0.2s;
}

.theme-toggle:hover{
  transform:translateY(-1px);
}

label{
  display:block;
  margin-top:18px;
  margin-bottom:10px;
  color:var(--muted);
  font-size:14px;
}

.select-wrapper{
  position:relative;
}

.select-wrapper::after{
  content:"⌄";
  position:absolute;
  right:16px;
  top:50%;
  transform:translateY(-50%);
  pointer-events:none;
  color:var(--muted);
  font-size:18px;
}

select{
  width:100%;
  padding:15px;
  border:none;
  border-radius:14px;
  background:var(--soft);
  color:var(--text);
  font-size:15px;
  outline:none;
  border:1px solid var(--border);
  appearance:none;
  transition:0.2s;
}

select:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(255,77,77,0.15);
}

.packs{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  margin-top:10px;
}

.pack-card{
  background:var(--soft);
  padding:14px 16px;
  border-radius:18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  cursor:pointer;
  border:2px solid transparent;
  transition:0.2s;
  position:relative;
  min-height:70px;
}

.pack-card:hover{
  border-color:var(--accent);
  transform:translateY(-2px);
}

.pack-card.active{
  border-color:var(--accent);
  background:rgba(255,77,77,0.08);
  box-shadow:0 0 20px rgba(255,77,77,0.15);
}

.pack-left{
  display:flex;
  align-items:center;
  gap:14px;
  min-width:0;
  flex:1;
}

.custom-checkbox{
  width:24px;
  height:24px;
  border-radius:8px;
  border:2px solid var(--accent);
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
  transition:0.2s;
}

.custom-checkbox::after{
  content:"✓";
  color:white;
  font-size:14px;
  display:none;
}

.pack-card.active .custom-checkbox{
  background:var(--accent);
}

.pack-card.active .custom-checkbox::after{
  display:block;
}

.pack-check{
  display:none;
}

.pack-name{
  font-weight:600;
  font-size:15px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.pack-price{
  background:rgba(255,77,77,0.12);
  color:var(--accent2);
  padding:8px 12px;
  border-radius:10px;
  font-size:14px;
  font-weight:bold;
  white-space:nowrap;
  border:1px solid rgba(255,77,77,0.2);
}

.warning{
  margin-top:18px;
  background:rgba(255,77,77,0.08);
  border:1px solid var(--accent);
  color:var(--accent2);
  padding:14px;
  border-radius:14px;
  display:none;
}

.total-box{
  margin-top:18px;
  background:var(--soft2);
  padding:18px;
  border-radius:16px;
  text-align:center;
  font-size:18px;
  font-weight:bold;
  border:1px solid var(--border);
}

.amount-box{
  margin-top:22px;
  background:var(--soft2);
  padding:24px;
  border-radius:18px;
  text-align:center;
  border:1px solid var(--border);
}

.crypto-amount{
  font-size:34px;
  font-weight:bold;
  margin-bottom:10px;
  word-break:break-word;
  color:var(--accent2);
}

.usd{
  color:var(--muted);
  font-size:15px;
}

.address-box{
  margin-top:20px;
  background:var(--soft2);
  padding:22px;
  border-radius:18px;
  border:1px solid var(--border);
}

.address-label{
  color:var(--muted);
  margin-bottom:12px;
  font-size:14px;
}

.address{
  word-break:break-all;
  line-height:1.9;
  font-size:18px;
  font-weight:600;
  letter-spacing:0.4px;
}

.address-highlight{
  color:var(--green);
  font-weight:bold;
}

.copy-btn{
  width:100%;
  margin-top:15px;
  padding:15px;
  border:none;
  border-radius:14px;
  background:var(--accent);
  color:white;
  cursor:pointer;
  font-size:15px;
  font-weight:bold;
  transition:0.2s;
}

.copy-btn:hover{
  transform:translateY(-1px);
  opacity:0.95;
}

.loading{
  margin-top:15px;
  text-align:center;
  color:var(--muted);
}

.next-section{
  margin-top:25px;
  background:var(--card2);
  border:1px solid var(--border);
  border-radius:18px;
  padding:20px;
}

.next-title{
  font-size:22px;
  font-weight:bold;
  color:var(--accent2);
  margin-bottom:8px;
}

.next-subtitle{
  color:var(--muted);
  margin-bottom:18px;
}

.support-text{
  margin-top:24px;
  margin-bottom:20px;
  display:flex;
  align-items:center;
  gap:14px;
  background:rgba(255,255,255,0.03);
  border:1px solid rgba(255,90,90,0.25);
  border-left:4px solid var(--accent);
  padding:18px;
  border-radius:16px;
  font-size:16px;
  line-height:1.7;
  color:var(--text);
}

.support-icon{
  width:24px;
  height:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--accent2);
  flex-shrink:0;
}

.support-icon svg{
  width:22px;
  height:22px;
  display:block;
}

.support-content{
  flex:1;
  display:flex;
  align-items:center;
}

.message-box{
  background:var(--soft2);
  border:1px solid var(--border);
  border-radius:14px;
  padding:18px;
  white-space:pre-line;
  line-height:1.7;
  margin-bottom:15px;
  word-break:break-word;
}

@media(max-width:640px){

  .packs{
    grid-template-columns:1fr;
  }

  .topbar{
    flex-direction:column;
    gap:16px;
  }

  .title{
    text-align:center;
  }

  .pack-card{
    padding:14px;
  }

  .pack-name{
    font-size:14px;
  }

  .pack-price{
    font-size:13px;
    padding:7px 10px;
  }

  .address{
    font-size:16px;
  }
}