:root {
  /* Classic Paper Reading Theme */
  --bg-color: #FAFAF8;
  --text-color: #2b2b2b;
  --text-light: #6b6b6b;
  --link-color: #0b5394;
  --link-hover: #073763;
  --border-color: #e3e3e3;
  
  /* Brand/Accent specifically designed to look like highlighters and dictionary entries */
  --accent-color: #b7410e;
  --accent-bg: #fff0e5;
  --list-bg: #f3f5f9;
  --code-bg: #f0f0f0;

  /* Typography */
  --font-reading: 'Lora', 'Georgia', serif;
  --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
  --base-size: 20px;
  --line-height: 1.8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a1b1d;
    --text-color: #e0e0e0;
    --text-light: #9e9e9e;
    --link-color: #79aeff;
    --link-hover: #b3d1ff;
    --border-color: #383838;
    --accent-color: #ff8c69;
    --accent-bg: #2d1e18;
    --list-bg: #22252a;
    --code-bg: #2b2b2b;
  }
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1rem;
  font-family: var(--font-reading);
  font-size: var(--base-size);
  line-height: var(--line-height);
  color: var(--text-color);
  background-color: var(--bg-color);
  -webkit-font-smoothing: antialiased;
}

/* Restrict width for optimal eye tracking */
header, main, footer {
  max-width: 680px;
  margin: 0 auto;
}

header {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 3rem;
}

header nav a.logo {
  font-family: var(--font-ui);
  font-weight: 800;
  font-size: 1.5rem;
  text-decoration: none;
  color: var(--text-color);
  letter-spacing: -0.5px;
}

main {
  min-height: 70vh;
}

footer {
  padding: 3rem 0;
  margin-top: 5rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--text-light);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-ui);
  font-weight: 700;
  color: var(--text-color);
  line-height: 1.25;
  margin-top: 2em;
  margin-bottom: 0.8em;
}

h1 { font-size: 2.2rem; margin-top: 0; letter-spacing: -0.5px; }

/* 
  Special styling for typical sections in language learning:
  "## Chinese Summary", "## Content Summary", "## Useful Phrases" 
*/
.content h2 { 
  font-size: 1.4rem; 
  color: var(--accent-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 800;
}
h3 { font-size: 1.25rem; }

p { margin-top: 0; margin-bottom: 1.5rem; }

a {
  color: var(--link-color);
  text-decoration: underline;
  text-decoration-color: var(--border-color);
  text-underline-offset: 4px;
  transition: all 0.2s ease;
}
a:hover {
  color: var(--link-hover);
  text-decoration-color: var(--link-hover);
  text-decoration-thickness: 2px;
}

/* Enhancing Vocabulary Lists */
.content ul, .content ol {
  margin: 2rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2.5rem;
  background-color: var(--list-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}
.content li {
  margin-bottom: 1rem;
}
.content li:last-child {
  margin-bottom: 0;
}

/* Make vocabulary words punchy */
.content strong {
  font-family: var(--font-ui);
  color: var(--text-color);
  background-color: rgba(0, 0, 0, 0.05);
  padding: 0.1em 0.3em;
  border-radius: 4px;
}
@media (prefers-color-scheme: dark) {
  .content strong { background-color: rgba(255, 255, 255, 0.1); }
}

.content em {
  color: var(--text-light);
}

/* Styled for context or example sentences */
.content blockquote {
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--accent-color);
  background-color: var(--accent-bg);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  font-size: 1.05rem;
}
.content blockquote p { margin-bottom: 0; }

/* Meta data */
.article-header {
  margin-bottom: 3rem;
}
.meta {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 1rem;
}
.meta a { color: var(--link-color); text-decoration: none; }
.meta a:hover { text-decoration: underline; }

/* Lists styling */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}
.list-item h2 a, .list-item h3 a {
  text-decoration: none;
}
.list-item h2 a:hover, .list-item h3 a:hover {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}
.list-item p.meta {
  margin-bottom: 0.5rem;
}
.list-item .read-more {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-block;
  margin-top: 0.5rem;
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  text-decoration: none;
}
.list-item .read-more:hover {
  background-color: var(--bg-color);
  border-color: var(--link-color);
}

.hero {
  margin: 2rem 0 4rem;
  text-align: center;
}
.hero h1 { font-size: 3rem; margin-bottom: 1rem; }
.hero p { 
  font-size: 1.25rem; 
  color: var(--text-light); 
  font-family: var(--font-ui); 
  max-width: 500px;
  margin: 0 auto;
}

/* Code */
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  background-color: var(--code-bg);
  padding: 0.1em 0.3em;
  border-radius: 4px;
}

img, video {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 2rem 0;
}