@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+CJK+JP:wght@400;700&family=Noto+Sans+CJK+KR:wght@400;700&family=Noto+Sans+CJK+SC:wght@400;700&family=Noto+Serif+KR:wght@400;700&family=Orbitron:wght@700&display=swap');

/* Light Theme (Default) */
:root {
  --body-background: #f0f0f0;
  --card-background: #ffffff;
  --text-color: #333;
  --button-bg: #e9e9e9;
  --button-text: #555;
  --button-border: #ccc;
  --button-active-bg: var(--text-color);
  --button-active-text: var(--card-background);
  --button-active-border: var(--text-color);
  --detail-card-bg: #fafafa;
  --detail-card-border: #e0e0e0;
  --glow-color: rgba(77, 144, 254, 0.5);

  --font-hanja: 'Noto Sans CJK KR', sans-serif;
  --font-chineseS: 'Noto Sans CJK SC', sans-serif;
  --font-japanese: 'Noto Sans CJK JP', sans-serif;
  --main-font: 'Orbitron', sans-serif;
}

/* Dark Theme */
[data-theme="dark"] {
  --body-background: #1a1a2e;
  --card-background: #2e2e4a;
  --text-color: #e0e0ff;
  --button-bg: #3c3c5c;
  --button-text: #bbb;
  --button-border: #4a4a6e;
  --button-active-bg: var(--text-color);
  --button-active-text: var(--body-background);
  --button-active-border: var(--text-color);
  --detail-card-bg: #3a3a5e;
  --detail-card-border: #4e4e7a;
  --glow-color: rgba(100, 150, 255, 0.7);
}

body {
  font-family: var(--main-font);
  background-color: var(--body-background);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  text-align: center;
  transition: background-color 0.3s ease, color 0.3s ease; /* Smooth transition for theme change */
}

.container {
  width: 90%;
  max-width: 500px;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  color: var(--text-color);
  text-shadow: 1px 1px 3px rgba(0,0,0,0.1);
  transition: color 0.3s ease;
}

/* Common button styles */
.control-button {
  background-color: var(--button-bg);
  color: var(--button-text);
  border: 1px solid var(--button-border);
  padding: 0.6rem 1rem;
  font-family: var(--main-font);
  font-size: 0.85rem;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: none;
  margin: 0.25rem; /* Add some margin for spacing */
}

.control-button:hover {
  background-color: var(--button-bg); /* Keep base color */
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15), 0 0 15px var(--glow-color);
}

.control-button.active {
  background-color: var(--button-active-bg);
  color: var(--button-active-text);
  border-color: var(--button-active-border);
  font-weight: bold;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

/* Theme Toggle Button specific styling */
#theme-toggle {
    font-size: 1.5rem; /* Larger icon */
    padding: 0.5rem 1rem;
    border-radius: 50%; /* Make it round */
    width: 3rem;
    height: 3rem;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1rem auto; /* Center and give space */
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

#theme-toggle:hover {
    transform: rotate(15deg) scale(1.05);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2), 0 0 15px var(--glow-color);
}


/* Character Set Selector Styles */
.char-set-selector {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.char-set-selector button {
  background-color: var(--button-bg);
  color: var(--button-text);
  border: 1px solid var(--button-border);
  padding: 0.6rem 1rem;
  font-family: var(--main-font);
  font-size: 0.85rem;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: none;
}

.char-set-selector button:hover {
  background-color: var(--button-bg);
  transform: none;
  box-shadow: none;
}

.char-set-selector button.active {
  background-color: var(--button-active-bg);
  color: var(--button-active-text);
  border-color: var(--button-active-border);
  font-weight: bold;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

.navigation {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

#prev-btn, #next-btn {
  background-color: var(--card-background);
  color: var(--text-color);
  border: 1px solid var(--button-border);
  padding: 0.8rem 1.5rem;
  font-family: var(--main-font);
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#prev-btn:hover, #next-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0,0,0,0.15), 0 0 15px var(--glow-color);
  color: var(--text-color);
}

#prev-btn:active, #next-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}


/* Details Container Styles */
#details-container {
  margin-top: 2rem;
  width: 100%;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr); /* Force 4 columns */
  gap: 1rem;
}

.detail-card {
  background-color: var(--detail-card-bg);
  border: 1px solid var(--detail-card-border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.detail-card h3 {
  font-family: var(--hanja-font);
  font-size: 2rem;
  margin: 0 0 1rem 0;
  color: var(--text-color); /* Use text color variable */
  transition: color 0.3s ease;
}

.detail-card p {
  font-family: var(--main-font);
  font-size: 0.9rem;
  color: var(--text-color); /* Use text color variable */
  margin: 0.25rem 0;
  transition: color 0.3s ease;
}