body{
  margin:0;
  background:#f4f6fb;
  font-family:Microsoft YaHei, Arial, sans-serif;
  color:#222;
}

.container{
  max-width:1100px;
  margin:40px auto;
  background:white;
  padding:36px;
  border-radius:24px;
  box-shadow:0 10px 30px rgba(0,0,0,.08);
}

h1{
  margin-top:0;
  font-size:56px;
  font-weight:900;
}

h2{
  margin-top:48px;
  font-size:24px;
}

.sub{
  color:#555;
  line-height:1.9;
  font-size:16px;
}

.subtitle{
  color:#666;
  line-height:1.8;
}

.nav{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  margin:28px 0 10px;
}

.nav a{
  text-decoration:none;
  color:#2563eb;
  background:#eef2ff;
  padding:12px 18px;
  border-radius:12px;
  font-weight:600;
}

form{
  display:flex;
  gap:14px;
  align-items:center;
  flex-wrap:wrap;
}

button{
  background:#2563eb;
  color:white;
  border:none;
  border-radius:12px;
  padding:14px 26px;
  font-size:18px;
  font-weight:700;
  cursor:pointer;
}

button:hover{
  opacity:.92;
}

#result{
  margin-top:28px;
  border:1px solid #e5e7eb;
  background:#fafafa;
  border-radius:16px;
  padding:22px;
  min-height:48px;
  line-height:1.8;
}

.feature-grid{
  margin-top:42px;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:22px;
}

.card{
  background:#fff;
  padding:24px;
  border-radius:18px;
  box-shadow:0 8px 24px rgba(0,0,0,.05);
}

.pricing-box{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:22px;
  margin-top:18px;
}

.price-card{
  background:#fff;
  border:1px solid #e5e7eb;
  padding:26px;
  border-radius:18px;
}

.hot{
  border:2px solid #2563eb;
  background:#f8fbff;
}

.promo-box{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:20px;
  margin-top:20px;
}

.promo-card{
  background:white;
  padding:25px;
  border-radius:16px;
  box-shadow:0 8px 25px rgba(0,0,0,.06);
}

.hot2{
  border:2px solid #ff5b2e;
}

.buy-btn{
  background:#ff5b2e;
  color:white;
  border:none;
  padding:16px 34px;
  font-size:20px;
  border-radius:14px;
  cursor:pointer;
  font-weight:bold;
  margin-top:22px;
}

.buy-btn:hover{
  transform:translateY(-2px);
}

.secondary-btn{
  background:#e5e7eb;
  color:#111827;
  border:none;
  padding:16px 24px;
  font-size:16px;
  border-radius:14px;
  cursor:pointer;
  font-weight:600;
}

.secondary-btn:hover{
  opacity:.9;
}

/* 弹窗 */
.modal{
  display:none;
  position:fixed;
  z-index:999;
  left:0;
  top:0;
  width:100%;
  height:100%;
  background:rgba(0,0,0,0.45);
  justify-content:center;
  align-items:center;
  padding:20px;
  box-sizing:border-box;
}

.modal-content{
  background:#fff;
  width:100%;
  max-width:560px;
  padding:30px;
  border-radius:20px;
  box-shadow:0 12px 30px rgba(0,0,0,0.2);
  position:relative;
  box-sizing:border-box;
}

.close-btn{
  position:absolute;
  right:18px;
  top:12px;
  font-size:30px;
  cursor:pointer;
}

.qr-box{
  margin:22px 0;
  display:flex;
  justify-content:center;
}

.real-qr{
  width:220px;
  height:220px;
  object-fit:contain;
  border-radius:12px;
  border:1px solid #ddd;
  background:#fff;
}

.tip-text{
  color:#666;
  font-size:14px;
  line-height:1.7;
}

.countdown-text{
  color:#c2410c;
  font-weight:700;
  margin-top:10px;
}

.modal-btn-row{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top:12px;
}

@media (max-width: 768px){
  h1{
    font-size:40px;
  }

  .pricing-box{
    grid-template-columns:1fr;
  }

  .modal-content{
    padding:22px;
  }

  .real-qr{
    width:180px;
    height:180px;
  }
}