/* Reset and base styles */
*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  --color-primary: #2c3e50;
  --color-secondary: #3498db;
  --color-accent: #e74c3c;
  --color-bg: #fafafa;
  --color-bg-alt: #ffffff;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #e0e0e0;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 800px;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.site-header {
  background-color: var(--color-primary);
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  margin: 0;
  font-size: 1.5rem;
  font-family: var(--font-serif);
}

.site-title a {
  color: white;
  text-decoration: none;
}

.site-nav a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}

.site-nav a:hover {
  color: white;
  text-decoration: underline;
}

/* Main content */
.site-content {
  padding: 2rem 0;
  min-height: calc(100vh - 200px);
}

/* Footer */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255,255,255,0.8);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.875rem;
}

/* Word entry page */
.word-entry {
  background: var(--color-bg-alt);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.word-header {
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.word-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  margin: 0 0 0.5rem 0;
  color: var(--color-primary);
}

.word-phonetic {
  font-size: 1.25rem;
  color: var(--color-text-light);
  font-style: italic;
}

.word-nav {
  margin-bottom: 1.5rem;
}

.word-nav a {
  color: var(--color-secondary);
  text-decoration: none;
}

.word-nav a:hover {
  text-decoration: underline;
}

.word-content h2 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.word-content p {
  margin: 0.5rem 0;
}

.word-content blockquote {
  border-left: 3px solid var(--color-secondary);
  margin: 0.75rem 0;
  padding: 0.5rem 1rem;
  background: var(--color-bg);
  font-style: italic;
  color: var(--color-text-light);
}

.word-content code {
  background: var(--color-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-size: 0.9em;
}

/* Synonyms and Antonyms */
.word-synonyms, .word-antonyms {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.word-synonyms h2, .word-antonyms h2 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.tag-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--color-secondary);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.875rem;
}

.tag-antonym {
  background: var(--color-accent);
}

/* Letter index page */
.letter-header {
  text-align: center;
  margin-bottom: 2rem;
}

.letter-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.word-count {
  color: var(--color-text-light);
  margin: 0;
}

.letter-nav {
  margin-bottom: 2rem;
}

.letter-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.letter-list li a {
  display: block;
  width: 2.5rem;
  height: 2.5rem;
  line-height: 2.5rem;
  text-align: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
}

.letter-list li a:hover {
  background: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
}

.letter-list li a.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.word-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
  column-count: 3;
  column-gap: 2rem;
}

.word-list li {
  break-inside: avoid;
  margin-bottom: 0.5rem;
}

.word-list a {
  color: var(--color-text);
  text-decoration: none;
  padding: 0.25rem 0;
  display: block;
}

.word-list a:hover {
  color: var(--color-secondary);
}

/* Home page */
.home-header {
  text-align: center;
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

.home-header h1 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.home-header p {
  color: var(--color-text-light);
  font-size: 1.1rem;
  margin: 0;
}

.home-stats {
  text-align: center;
  padding: 1.5rem;
  background: var(--color-bg-alt);
  border-radius: 8px;
  margin-bottom: 2rem;
}

.home-stats strong {
  font-size: 1.5rem;
  color: var(--color-secondary);
}

/* Responsive */
@media (max-width: 600px) {
  .word-list ul {
    column-count: 2;
  }

  .site-header .container {
    flex-direction: column;
    gap: 0.75rem;
  }

  .site-nav a:first-child {
    margin-left: 0;
  }

  .word-title {
    font-size: 2rem;
  }
}