/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-text: #1a1a1a;
  --color-text-light: #666;
  --color-bg: #ffffff;
  --color-border: #e0e0e0;
  --color-link: #0066cc;
  --color-link-hover: #004499;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 800px;
  --spacing: 1.5rem;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 2em;
  margin-bottom: 1em;
}

h1 {
  font-size: 2.25em;
  margin-top: 0;
}

h2 {
  font-size: 1.75em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5em;
}

h3 {
  font-size: 1.4em;
}

p {
  margin-bottom: 1em;
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

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

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5em;
  font-weight: 600;
  color: var(--color-text);
}

.logo:hover {
  text-decoration: none;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2em;
}

nav a {
  color: var(--color-text-light);
  font-size: 0.95em;
}

nav a:hover {
  color: var(--color-text);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing) 4rem;
}

footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing) 0;
  margin-top: 4rem;
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9em;
}

footer p {
  margin-bottom: 0.5em;
}

/* Article styles */
article {
  margin-bottom: 4rem;
}

article header {
  border-bottom: none;
  margin-bottom: 2rem;
  padding: 0;
}

article h1 {
  font-size: 2.5em;
  margin-bottom: 0.5em;
}

section {
  margin-bottom: 3rem;
}

section h2 {
  margin-top: 0;
}

/* Lists */
ul, ol {
  margin-left: 2em;
  margin-bottom: 1em;
}

li {
  margin-bottom: 0.5em;
}

/* Answer Station specific */
.answer-station .direct-answer {
  background-color: #f8f9fa;
  padding: 1.5em;
  border-left: 4px solid var(--color-link);
  margin-bottom: 2.5rem;
}

.answer-station .direct-answer p {
  font-size: 1.1em;
  margin-bottom: 0;
}

.what-this-is-not ul {
  list-style: none;
  margin-left: 0;
}

.what-this-is-not li {
  padding-left: 1.5em;
  position: relative;
}

.what-this-is-not li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-text-light);
}

/* References */
.references {
  border-top: 1px solid var(--color-border);
  padding-top: 1.5em;
  margin-top: 3rem;
}

.references h2 {
  font-size: 1.2em;
  margin-bottom: 1em;
}

.references ul {
  list-style: none;
  margin-left: 0;
}

.references li {
  margin-bottom: 0.75em;
  padding-left: 1.5em;
  position: relative;
}

.references li::before {
  content: "•";
  position: absolute;
  left: 0;
}

/* Glossary */
.glossary-label {
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

.glossary-label a {
  color: inherit;
}

.glossary-definition {
  font-size: 1.05em;
  line-height: 1.75;
}

.glossary-definition p:first-child {
  margin-top: 0;
}

/* Homepage */
.homepage-intro {
  font-size: 1.2em;
  line-height: 1.8;
  margin-bottom: 3rem;
  color: var(--color-text-light);
}

.content-list {
  list-style: none;
  margin-left: 0;
}

.content-list li {
  margin-bottom: 1em;
  padding-left: 0;
}

.content-list a {
  font-size: 1.1em;
}

/* Responsive */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 1em;
  }

  nav ul {
    flex-direction: column;
    gap: 1em;
  }

  h1 {
    font-size: 1.75em;
  }

  h2 {
    font-size: 1.4em;
  }

  main {
    padding: 0 var(--spacing) 3rem;
  }
}