:root {
  --bg-color: #ffffff;
  --text-color: #171717;
  --primary-color: #2F4858;
  --secondary-color: #A0522D;
  --accent-light: #f4f4f4;
  --border-color: #e0e0e0;
  --max-width: 850px;
  --transition: all 0.3s ease;
  --font-serif: "Crimson Pro", "Playfair Display", "Georgia", serif;
  --font-sans: "Inter", "Helvetica Neue", "Arial", sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  line-height: 1.75;
  font-size: 1.1rem;
  -webkit-font-smoothing: antialiased;
}

header {
  border-bottom: 1px solid var(--border-color);
  padding: 3rem 1rem;
  margin-bottom: 4rem;
  text-align: center;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

h1, h2, h3, h4, .academic-heading {
  font-family: var(--font-serif);
  color: var(--primary-color);
  line-height: 1.2;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 2.75rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  margin-top: 3rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

p {
  margin-bottom: 1.5rem;
}

a {
  color: var(--primary-color);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  transition: var(--transition);
}

a:hover {
  color: var(--secondary-color);
  text-decoration-thickness: 2px;
}

nav {
  margin-top: 2rem;
  font-family: var(--font-sans);
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
}

nav li {
  position: relative;
}

nav a {
  margin: 0 0.8rem;
  text-decoration: none;
  color: var(--text-color);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  font-weight: 600;
  padding: 0.5rem 0;
  display: inline-block;
  transition: var(--transition);
}

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

/* Dropdown Menu Styles */
nav ul ul {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-color);
  min-width: 220px;
  display: none;
  z-index: 1000;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  padding: 0.5rem 0;
  list-style: none;
}

nav ul li:hover > ul {
  display: block;
}

nav ul ul li {
  display: block;
  margin: 0;
}

nav ul ul a {
  padding: 0.6rem 1.25rem;
  text-transform: none;
  font-size: 0.85rem;
  letter-spacing: 0;
  font-weight: 500;
  color: var(--text-color);
  display: block;
  text-align: left;
  margin: 0;
}

nav ul ul a:hover {
  background-color: var(--accent-light);
  color: var(--primary-color);
}

.metadata {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 2rem;
  font-style: italic;
  font-family: var(--font-serif);
}

blockquote {
  margin: 2.5rem 0;
  padding-left: 2rem;
  border-left: 3px solid var(--secondary-color);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  color: #444;
}

button, .btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.8rem 1.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

button:hover, .btn:hover {
  background-color: var(--secondary-color);
  transform: translateY(-1px);
}

article {
  margin-bottom: 5rem;
}

.case-study-box {
  background-color: var(--accent-light);
  padding: 2rem;
  border-left: 4px solid var(--primary-color);
  margin: 2rem 0;
}

.tags {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.tag {
  display: inline-block;
  background: var(--accent-light);
  color: var(--primary-color);
  padding: 0.2rem 0.8rem;
  font-size: 0.8rem;
  margin-right: 0.5rem;
  text-decoration: none;
  border-radius: 2px;
}

.tag:hover {
  background: var(--primary-color);
  color: white;
}

footer {
  margin-top: 6rem;
  padding: 4rem 1rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.9rem;
  color: #666;
}

.footnote {
  font-size: 0.85rem;
  color: #555;
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

@media (max-width: 600px) {
  h1 { font-size: 2rem; }
  body { font-size: 1rem; }
  .container { padding: 0 1.25rem; }
}