:root{
  --bg:#0f172a;
  --card:#111c33;
  --primary:#4f46e5;
  --accent:#ffcc00;
  --text:#e5e7eb;
  --muted:#94a3b8;
}

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

body{
  background: radial-gradient(circle at top, #1e293b, #0f172a);
  color:var(--text);
  min-height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  padding:20px;
}

.checkout-container{
  width:100%;
  max-width:1000px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:30px;
  background:rgba(17,28,51,0.7);
  backdrop-filter:blur(10px);
  border-radius:20px;
  overflow:hidden;
  box-shadow:0 20px 60px rgba(0,0,0,0.5);
}

.left{
  padding:40px;
}

.badge{
  display:inline-block;
  background:rgba(79,70,229,0.2);
  color:#a5b4fc;
  padding:6px 12px;
  border-radius:50px;
  font-size:12px;
  margin-bottom:15px;
}

h1{
  font-size:28px;
  margin-bottom:10px;
}

p{
  color:var(--muted);
  font-size:14px;
  margin-bottom:25px;
}

.course-box{
  background:#0b1224;
  padding:20px;
  border-radius:15px;
  margin-bottom:20px;
  border:1px solid rgba(255,255,255,0.05);
}

.price{
  font-size:24px;
  color:var(--accent);
  font-weight:600;
}

.features{
  margin-top:20px;
}

.features li{
  list-style:none;
  margin:10px 0;
  color:var(--muted);
  font-size:14px;
}

.features i{
  color:var(--accent);
  margin-right:8px;
}

.right{
  background:linear-gradient(135deg,#1e293b,#0b1224);
  padding:40px;
  display:flex;
  flex-direction:column;
  justify-content:center;
}

.payment-box{
  background:rgba(255,255,255,0.03);
  padding:25px;
  border-radius:15px;
  border:1px solid rgba(255,255,255,0.05);
}

label{
  font-size:13px;
  color:var(--muted);
}

input{
  width:100%;
  padding:12px;
  margin-top:5px;
  margin-bottom:15px;
  border-radius:10px;
  border:none;
  outline:none;
  background:#0f172a;
  color:white;
}

.payBtn{
  width:100%;
  padding:14px;
  border:none;
  border-radius:10px;
  background:linear-gradient(90deg,var(--primary),#ffcc00);
  color:white;
  font-weight:600;
  cursor:pointer;
  transition:0.3s;
}

.btn:hover{
  transform:scale(1.03);
}

.note{
  font-size:12px;
  color:var(--muted);
  margin-top:10px;
  text-align:center;
}

/* responsive */
@media(max-width:900px){
  .checkout-container{
    grid-template-columns:1fr;
  }
}

/* ================= FIX BUTTON HOVER ================= */
.payBtn:hover{
  transform:scale(1.03);
  filter:brightness(1.1);
}

.payBtn:active{
  transform:scale(0.98);
}

/* ================= LOADING & SUCCESS STATES ================= */
.state-screen{
  position:fixed;
  inset:0;
  background:rgba(15,23,42,0.92);
  backdrop-filter:blur(12px);
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:15px;
  z-index:9999;
  text-align:center;
  padding:20px;
}

.hidden{
  display:none;
}

/* Loader Stripe style */
.loader{
  width:55px;
  height:55px;
  border-radius:50%;
  border:4px solid rgba(255,255,255,0.1);
  border-top:4px solid var(--primary);
  animation:spin 1s linear infinite;
}

@keyframes spin{
  to{ transform:rotate(360deg); }
}

/* SUCCESS CHECK */
.checkmark{
  font-size:70px;
  color:#22c55e;
  animation:pop 0.4s ease;
}

@keyframes pop{
  0%{ transform:scale(0); }
  80%{ transform:scale(1.2); }
  100%{ transform:scale(1); }
}

/* SUCCESS BUTTON */
.success-btn{
  margin-top:20px;
  padding:12px 20px;
  border-radius:10px;
  background:linear-gradient(90deg,var(--primary),#6366f1);
  color:white;
  text-decoration:none;
  font-weight:600;
  transition:0.3s;
}

.success-btn:hover{
  transform:translateY(-2px);
  filter:brightness(1.1);
}

/* ================= SMALL UI IMPROVEMENTS ================= */
.course-box{
  transition:0.3s;
}

.course-box:hover{
  transform:translateY(-2px);
}

.payment-box{
  transition:0.3s;
}

.payment-box:hover{
  transform:translateY(-2px);
}

/* ================= PREMIUM BUTTON ================= */

.payBtn{
  position:relative;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
}

.btn-loader{
  display:flex;
  align-items:center;
  justify-content:center;
}

.btn-loader i{
  font-size:20px;
  animation:spin 1s linear infinite;
}

@keyframes spin{
  to{
    transform:rotate(360deg);
  }
}

.payBtn.loading{
  opacity:0.8;
  pointer-events:none;
}

.payBtn.loading .btn-text{
  display:none;
}

.payBtn.loading .btn-loader{
  display:flex;
}