/* ==========================================
   Academic Theme - Classic & Clean Design
   ========================================== */

/* CSS Variables */
:root {
  --primary-color: #1a365d;
  --secondary-color: #2c5282;
  --accent-color: #c53030;
  --text-color: #2d3748;
  --light-text: #4a5568;
  --bg-color: #ffffff;
  --bg-light: #f7fafc;
  --border-color: #e2e8f0;
  --font-serif: 'Merriweather', Georgia, 'Times New Roman', serif;
  --font-sans: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 900px;
  --sidebar-width: 220px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text-color);
  line-height: 1.7;
  margin: 0;
  padding: 0;
  background: var(--bg-color);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--primary-color);
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  line-height: 1.3;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1em;
}

a {
  color: var(--secondary-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

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

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

header {
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.site-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary-color);
}

.site-title:hover {
  border: none;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
}

nav a {
  color: var(--light-text);
  font-size: 0.95rem;
  font-weight: 500;
}

nav a:hover,
nav a.active {
  color: var(--primary-color);
}

/* Main Content */
main {
  padding: 2.5rem 0;
  min-height: calc(100vh - 200px);
}

/* Profile Section */
.profile-section {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
}

.profile-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.profile-info {
  flex: 1;
}

.profile-name {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.profile-title {
  color: var(--light-text);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.9rem;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.contact-links .icon {
  width: 16px;
  height: 16px;
  vertical-align: middle;
}

.email-highlight {
  background-color: #e2e8f0;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--text-color);
}

/* Sections */
.section {
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 1.35rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1.25rem;
}

/* Publications */
.pub-item {
  margin-bottom: 1.25rem;
  padding-left: 0;
}

.pub-title {
  font-weight: 600;
  color: var(--text-color);
}

.pub-authors {
  font-size: 0.95rem;
}

.pub-journal {
  font-style: italic;
  color: var(--light-text);
  font-size: 0.9rem;
}

.pub-links {
  margin-top: 0.35rem;
  font-size: 0.85rem;
}

.pub-links a {
  margin-right: 0.75rem;
}

/* Research Interests */
.research-list {
  list-style: none;
  padding: 0;
}

.research-list li {
  margin-bottom: 0.75rem;
  padding-left: 1.25rem;
  position: relative;
}

.research-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--secondary-color);
  font-size: 0.9rem;
}

/* Experience */
.timeline-item {
  margin-bottom: 1.5rem;
  padding-left: 0;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-title {
  font-weight: 600;
  font-size: 1.05rem;
}

.timeline-date {
  color: var(--light-text);
  font-size: 0.9rem;
}

.timeline-place {
  color: var(--secondary-color);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.timeline-desc {
  margin-top: 0.5rem;
}

.timeline-desc li {
  margin-bottom: 0.35rem;
  padding-left: 0.5rem;
}

/* News / Updates */
.news-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.news-date {
  color: var(--light-text);
  font-size: 0.9rem;
  min-width: 80px;
  flex-shrink: 0;
}

/* Awards */
.award-item {
  margin-bottom: 0.75rem;
}

.award-title {
  font-weight: 600;
}

.award-details {
  color: var(--light-text);
  font-size: 0.9rem;
}

/* CV Button */
.cv-button {
  display: inline-block;
  background: var(--primary-color);
  color: white !important;
  padding: 0.6rem 1.25rem;
  border-radius: 4px;
  font-weight: 500;
  transition: background 0.2s ease;
}

.cv-button:hover {
  background: var(--secondary-color);
  border-bottom: none;
}

/* Footer */
footer {
  background: var(--bg-light);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--light-text);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .profile-section {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .contact-links {
    justify-content: center;
  }

  nav ul {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .header-inner {
    flex-direction: column;
    gap: 1rem;
  }
}

/* Print Styles */
@media print {
  header, footer {
    display: none;
  }

  body {
    font-size: 11pt;
  }

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