.set {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  width: 100%;
  padding-bottom: 80px;
  background-color: var(--bg-gradient-start);
  color: var(--text-color);
}

.title {
  width: 90%;
  max-width: 900px;
  text-align: center;
  padding: 20px;
  border-radius: 10px;
  background-color: var(--bg-gradient-end);
  margin-bottom: 20px;
  margin-top: 20px;
}
.title h1 {
  margin: 0;
  font-size: 2.5rem;
  color: var(--text-color);
}
.title h2 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text-color);
}

.title h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-color);
}

.title h4 {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--text-color);
}

.set button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: .6em 1.2em;
  font-size: 1em;
  font-weight: 600;
  font-family: inherit;
  background-color: var(--accent-color-1);
  cursor: pointer;
  transition: transform .2s, box-shadow .2s;
  margin: 5px;
}

.set button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.4);
}
.set button:active {
  transform: scale(0.97);
}

.buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 15px;
  margin-bottom: 15px;
}

#shuffle-button {
  background: linear-gradient(90deg, red, orange, yellow, green, blue, indigo, violet);
  color: white;
  border: none;
  padding: 12px 25px;
  font-size: 1.1rem;
  border-radius: 10px;
  margin-top: 20px;
  text-shadow: 2px 2px 3px black;
}
#shuffle-button:hover {
  box-shadow: 0 0 10px black;
  background: linear-gradient(90deg, violet, indigo, blue, green, yellow, orange, red);
}

.input-section {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--bg-gradient-end);
  border-radius: 15px;
}

.textbox {
  width: 260px;
  padding: 10px;
  border: 2px solid var(--bg-gradient-end);
  border-radius: 6px;
  background-color: var(--bg-gradient-end);
  color: var(--text-color);
}

.submit-button {
  padding: 10px 20px;
  margin-left: 10px;
  border: none;
  border-radius: 6px;
  background-color: var(--green, green);
  color: white;
}
.submit-button:hover {
  background-color: var(--green-dark, darkgreen);
}

.feedback {
  margin-top: 15px;
  font-weight: bold;
  text-align: center;
}

.streaks {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-top: 10px;
  color: orange;
}

.deck-header {
  width: 100%;
  display: flex;
  justify-content: flex-start;
  padding: 10px 20px;
  box-sizing: border-box;
}

.back-btn {
  border-radius: 50px;
  background-color: var(--accent-color-1, #555);
}

.back-btn:hover {
  background-color: #c9302c;
}

.back-btn:active {
  transform: scale(0.95);
}