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

.container {
  height: 100vh;
  width: 100vw;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #f3f4f6 0%, #e0e7ff 100%);
}

.open-btn {
  padding: 16px 36px;
  font-size: 1.25rem;
  color: #fff;
  font-weight: 600;
  background: #2563eb;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.08);
  transition: all 0.2s;
}

.open-btn:hover,
.open-btn:focus {
  background: #1d4ed8;
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.15);
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(37, 99, 235, 0.18);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 2, 0.3, 1);
  z-index: 10;
}

.overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.1);
  padding: 36px 32px 28px 32px;
  width: 360px;
  background: #fff;
  box-shadow: 0 8px 32px rgba(37, 99, 235, 0.1),
    0 1.5px 6px rgba(0, 0, 0, 0.08);
  text-align: center;
  border-radius: 18px;
  transition: all 0.3s cubic-bezier(0.4, 2, 0.3, 1);
  visibility: hidden;
  opacity: 0;
  z-index: 20;
}

.popup.open {
  transform: translate(-50%, -50%) scale(1);
  visibility: visible;
  opacity: 1;
}

.popup img {
  width: 80px;
  margin-top: -60px;
  margin-bottom: 10px;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
  background: #e0e7ff;
  padding: 8px;
}

.popup h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #2563eb;
}

.popup p {
  font-size: 1rem;
  color: #475569;
  margin-bottom: 22px;
}

.popup button {
  width: 100%;
  padding: 12px 0;
  font-size: 1rem;
  color: #fff;
  background: #22c55e;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 1.5px 6px rgba(34, 197, 94, 0.08);
}

.popup button:hover,
.popup button:focus {
  background: #16a34a;
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 4px 16px rgba(34, 197, 94, 0.15);
}