/* Base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f4f4f4;
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
}

/* Navigation (Category Select) */
.nav-container {
  margin: 1rem 0;
  text-align: center;
}

select {
  padding: 8px 12px;
  font-size: 16px;
  border-radius: 6px;
  border: 1px solid #ccc;
}

/* Flashcard container */
.flashcard-container {
  perspective: 1000px;
  width: 100%;
  max-width: 350px;
  margin: 1rem 0;
}

.flashcard {
  width: 100%;
  height: 220px;
  position: relative;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
  cursor: pointer;
}

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

.flashcard > div {
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 1.5rem;
  border-radius: 10px;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.front {
  background-color: #ffeb3b;
}

.back {
  background-color: #03a9f4;
  transform: rotateY(180deg);
  color: #fff;
}

/* Flashcard content */
#kanji {
  font-size: 3rem;
}

#hiragana,
#katakana {
  font-size: 1.2rem;
  margin-top: 0.5rem;
}

#english {
  font-size: 1.8rem;
  font-weight: bold;
}

#usage,
#category,
#pronunciation {
  font-size: 1rem;
  margin-top: 0.5rem;
}

/* Button controls */
.button-container {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 1.5rem;
}

.err-container {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 1.5rem;
  color:indianred;
	text-align: center;
	font-size: 14px;
}

button {
  padding: 10px 16px;
  font-size: 16px;
  background-color: #03a9f4;
  color: white;
  border: none;
  border-radius: 6px;
  transition: background-color 0.3s ease;
}

button:hover,
button:focus {
  background-color: #0288d1;
  outline: none;
}