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

:root {
  /* Light Theme (Default/Warm Theme) */
  --primary-color: #FFB300; /* A vibrant amber */
  --primary-hover: #FFA000;
  --secondary-color: #7CB342; /* A fresh green for positive associations */
  --secondary-hover: #689F38;
  --background-color: #FFFDE7; /* A soft, warm off-white */
  --text-color: #424242; /* Dark grey for good contrast */
  --text-secondary: #757575;
  --border-color: #E0E0E0;
  --success-bg: #DCEDC8;
  --success-text: #558B2F;
  --error-bg: #FFCDD2;
  --error-text: #D32F2F;
  --auth-error-bg: #FBE9E7;
  --auth-error-text: #BF360C;
  --container-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --footer-bg: #F5F5F5;
  --card-bg: white;
  --etymology-bg: #f0f8ff;
  --login-prompt-bg: #f5f5f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Dark Theme */
    --primary-color: #FFB300; /* Keep primary color for brand consistency */
    --primary-hover: #FFC107;
    --secondary-color: #8BC34A;
    --secondary-hover: #9CCC65;
    --background-color: #121212; /* Dark background */
    --text-color: #E0E0E0; /* Light grey text for dark mode */
    --text-secondary: #BDBDBD; /* Lighter grey for secondary text */
    --border-color: #424242; /* Darker border for dark mode */
    --success-bg: #1B5E20; /* Darker success background */
    --success-text: #A5D6A7; /* Lighter success text */
    --error-bg: #B71C1C; /* Darker error background */
    --error-text: #EF9A9A; /* Lighter error text */
    --auth-error-bg: #7F0000;
    --auth-error-text: #FFAB91;
    --container-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    --footer-bg: #212121;
    --card-bg: #1E1E1E; /* Dark card background */
    --etymology-bg: #263238; /* Dark etymology box background */
    --login-prompt-bg: #212121; /* Dark login prompt background */
  }
}

body {
  font-family: Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Container Styles */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Header Styles */
.site-header {
  background-color: var(--card-bg);
  box-shadow: var(--container-shadow);
  padding: 1rem 0;
}

.site-title {
  color: var(--primary-color);
  margin-bottom: 1rem;
  text-align: center;
  font-size: 1.8rem;
}

/* Main Content Styles */
.site-main {
  flex: 1;
  padding: 2rem 0;
}

.site-main .container {
  background-color: var(--card-bg);
  border-radius: 8px;
  box-shadow: var(--container-shadow);
  padding: 2rem;
}

.site-main h2 {
  color: var(--text-color);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
}

.site-main h3 {
  color: var(--text-color);
  margin: 1.5rem 0 1rem;
}

/* Footer Styles */
.site-footer {
  background-color: var(--footer-bg);
  padding: 1rem 0;
  text-align: center;
  margin-top: auto;
  box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
}

.site-footer p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Utility Classes */
.hidden {
  display: none;
}

/* Button Styles */
button {
  background-color: var(--primary-color);
  color: white;
  padding: 12px 24px;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: var(--primary-hover);
}

button:disabled {
  background-color: #cccccc;
  cursor: not-allowed;
}

/* Message Styles */
.status-message {
  margin-top: 1rem;
  padding: 10px;
  border-radius: 4px;
}

.status-message.success {
  background-color: var(--success-bg);
  color: var(--success-text);
}

.status-message.error {
  background-color: var(--error-bg);
  color: var(--error-text);
}

/* Login Message Styles */
.login-message {
  padding: 0.75rem;
  margin: 0.5rem 0;
  border-radius: 4px;
}

.login-message.success {
  background-color: var(--success-bg);
  color: var(--success-text);
}

.login-message.error {
  background-color: var(--error-bg);
  color: var(--error-text);
}

/* Auth Status Styles */
.auth-status {
  background-color: var(--card-bg);
  padding: 0.75rem;
  margin: 0.75rem 0;
  border-radius: 4px;
  border-left: 4px solid var(--primary-color);
}

/* Navigation Styles */
.navigation ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
  justify-content: center;
  border-bottom: 1px solid var(--border-color);
  border-top: 1px solid var(--border-color);
}

.navigation li {
  margin: 0 0.5rem;
  padding: 0.75rem 0;
}

.navigation a {
  text-decoration: none;
  color: var(--primary-color);
  font-weight: bold;
  padding: 0.5rem;
  transition: all 0.2s ease;
}

.navigation a:hover {
  text-decoration: underline;
}

.navigation a.active {
  color: var(--text-color);
  border-bottom: 2px solid var(--primary-color);
}

/* Content Styles */
.content {
  margin-top: 1.5rem;
}

/* Intro Section Styling */
.intro-section {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  line-height: 1.6;
}

.intro-section p {
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.etymology-box {
  background-color: var(--etymology-bg);
  border-left: 4px solid var(--primary-color);
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: 0 4px 4px 0;
}

.etymology-box h3 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.login-prompt {
  margin-top: 0.5rem;
  font-style: italic;
  color: var(--text-secondary);
  background-color: var(--login-prompt-bg);
  padding: 0.8rem;
  border-radius: 4px;
  text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  .navigation ul {
    flex-direction: column;
    align-items: center;
  }
  
  .navigation li {
    margin: 0.25rem 0;
  }
  
  .site-main .container {
    padding: 1.5rem;
  }
}