body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: #f2f8fa;
  color: #184a5a;
  padding: 0;
  margin: 0;
  min-height: 100vh;
}

header {
  background: #4bb9aa;
  color: #fff;
  padding: 1rem 0 0.5rem 0;
  text-align: center;
  box-shadow: 0 2px 8px #0001;
}

header h1 {
  margin: 0.2em 0 0.1em 0;
  font-weight: 700;
}

main {
  max-width: 480px;
  background: #fff;
  margin: 2rem auto;
  border-radius: 18px;
  box-shadow: 2px 4px 24px #46c9bb22;
  padding: 2rem 1.2rem 2rem 1.2rem;
}

#category-selector {
  text-align: center;
  margin-bottom: 2rem;
}

#category {
  font-size: 1.1em;
  padding: 0.4em 1em;
  border-radius: 6px;
  border: 1px solid #4bb9aa;
  background: #e9f7f5;
  color: #184a5a;
  margin-left: 0.8em;
}

#deck-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

#draw-card-btn {
  font-size: 1.1em;
  background: #4bb9aa;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.8em 2.6em;
  margin-bottom: 1.2em;
  cursor: pointer;
  transition: background 0.2s;
  font-weight: 600;
  letter-spacing: 1px;
}

#draw-card-btn:active {
  background: #18836e;
}

.card {
  min-height: 130px;
  max-width: 350px;
  margin: 0 auto;
  background: linear-gradient(135deg, #e9f7f5 80%, #b9f2de 108%);
  border-radius: 16px;
  box-shadow: 0 6px 24px #46c9bb33;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25em;
  color: #0f5247;
  padding: 1.3em;
  transition: opacity 0.7s;
  opacity: 1;
  margin-bottom: 1.2em;
  min-width: 230px;
  border: 1.2px solid #43bda9;
}

.card.hidden {
  opacity: 0;
  pointer-events: none;
}

#card-text {
  word-break: break-word;
  text-align: center;
  font-style: italic;
}

#history-section {
  border-top: 1px solid #eee;
  margin-top: 2.2em;
  padding-top: 1.2em;
}

#history-section h2 {
  font-size: 1em;
  font-weight: normal;
  margin-bottom: 0.7em;
  color: #184a5ac5;
}

#history-list {
  font-size: 0.97em;
  color: #184a5ad9;
  list-style-type: disc;
  padding-left: 1.5em;
}

#history-list li {
  margin-bottom: 0.4em;
  font-style: italic;
}

footer {
  text-align: center;
  font-size: 0.95em;
  color: #338276bb;
  margin-top: 1em;
  padding-bottom: 1.7em;
}

@media (max-width: 600px) {
  main {
    padding: 1rem 0.2rem 1.5rem 0.2rem;
    margin: 0.6rem;
    min-width: unset;
  }
  #card {
    font-size: 1em;
    padding: 1em;
    min-width: unset;
  }
}