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

body {
  background: linear-gradient(135deg, #9bb5fe, rgb(252, 70, 221) ,  #a2a84d);
  min-height: 100vh;
 
}
.container{
     display: flex;
  flex-direction: column;
}
header {
  display: flex;
   justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
   color: #fff;
}

h1 {
   font-weight: 600;
  font-size: 1.8rem;
}

.btn {
  padding: 10px 16px;
  border: none;
  border-radius: 10px;
   cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
}

.btn.primary {
   background: #6654eb;
  color: #fff;
}

.btn.primary:hover {
  background: #20384d;
}

.btn.success {
  background: #00b894;
  color: #fff;
}

.btn.danger {
  background: #d63031;
  color: #fff;
}

.btn:hover {
  transform: scale(1.05);
}

.flashcard-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 40px;
}

.flashcard {
  background: rgba(255, 255, 255, 0.25);
  border-radius: 15px;
  padding: 20px;
  color: #2d3436;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
  perspective: 1000px;
  position: relative;
  transition: transform 0.4s ease;
}

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

.flashcard-inner {
  width: 100%;
  height: 200px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s;
}

.flashcard.flip .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 15px;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
  font-size: 1.1rem;
}

.flashcard-front {
  background: rgba(255, 255, 255, 0.85);
}

.flashcard-back {
  background: #6c5ce7;
  color: #fff;
  transform: rotateY(180deg);
 
}

.delete-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #ff7675;
  color: white;
  border: none;
  border-radius: 50%;
  width: 25px;
  height: 25px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s;
}

.delete-btn:hover {
  background: #d63031;
}

.modal {
  display: none;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  backdrop-filter: blur(5px);
  background: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background: #fff;
  padding: 30px;
  border-radius: 15px;
  width: 90%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.modal input {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  border-radius: 8px;
  border: 1px solid #ccc;
}

.modal-actions {
  display: flex;
  justify-content: space-between;
  margin-top: 15px;
}

@media (max-width: 600px) {
  header {
    flex-direction: column;
    gap: 10px;
  }

  .flashcard-list {
    padding: 20px;
  }
}

    footer{
          text-align: center;
      font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
      background-color: #6db8b2;
     position: fixed;
  bottom: 0;
 width: 100%;
     }