/* RESET */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  background: radial-gradient(circle at top, #0f172a, #020617);
  color: #e5e7eb;
}

/* MAIN LAYOUT */
.checkout-container {
  display: flex;
  min-height: 100vh;
}

/* LEFT SIDE */
.plans {
  width: 50%;
  padding: 60px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(10px);
}

.plans h1 {
  font-size: 32px;
  margin-bottom: 10px;
}

.subtitle {
  color: #94a3b8;
  margin-bottom: 30px;
}

/* PLAN CARD */
.plan {
  background: linear-gradient(145deg, #1e293b, #0f172a);
  padding: 20px;
  margin-top: 15px;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.plan:hover {
  transform: translateY(-4px);
  border-color: #334155;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.plan.active {
  border: 1px solid #22c55e;
  box-shadow: 0 0 15px rgba(34, 197, 94, 0.5);
}

/* glow effect */
.plan.active::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 14px;
  background: radial-gradient(circle, rgba(34,197,94,0.15), transparent 70%);
  pointer-events: none;
}

.price {
  font-size: 26px;
  font-weight: bold;
  margin: 5px 0;
}

/* RIGHT SIDE */
.summary {
  width: 50%;
  padding: 60px;
  background: #020617;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.summary h2 {
  margin-bottom: 20px;
}

/* SUMMARY BOX */
.summary-box {
  background: linear-gradient(145deg, #1e293b, #020617);
  padding: 20px;
  border-radius: 14px;
  display: flex;
  justify-content: space-between;
  font-size: 18px;
  border: 1px solid #1e293b;
}

/* BUTTON */
button {
  margin-top: 25px;
  padding: 15px;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  color: white;
  transition: all 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(34, 197, 94, 0.3);
}

/* MOBILE RESPONSIVE */
@media (max-width: 900px) {
  .checkout-container {
    flex-direction: column;
  }

  .plans, .summary {
    width: 100%;
    padding: 30px;
  }
}