/* === TYPOGRAPHY SETUP === */
h1, h2 { font-family: 'Playfair Display', serif; }
body, nav a, .button { font-family: 'Montserrat', sans-serif; }

/* Font sizes */
h1 { font-size: 3rem; font-weight: 700; line-height: 1.1; }
h2 { font-size: 1.5rem; font-weight: 400; line-height: 1.3; }
body, nav a { font-size: 1rem; line-height: 1.6; }
.button { font-size: 0.875rem; font-weight: 500; }

/* === COLOR VARIABLES === */
:root {
  --bg: #ffffff;
  --fg: #0d1b33;
  --heading-fg: #102a47;
  --header-bg: #f8f9fa;
  --footer-bg: #f8f9fa;
  --nav-bg: #ffffff;
  --nav-hover: #d9e4f5;
  --button-bg: #0d3b66;
  --button-hover: #0a254a;
  --footer-fg: #424242;
}
body.dark-mode {
  --bg: #121212;
  --fg: #e0e0e0;
  --heading-fg: #add8e6;
  --header-bg: #1f1f1f;
  --nav-bg: #1f1f1f;
  --nav-hover: #333333;
  --button-bg: #333333;
  --button-hover: #444444;
  --footer-bg: #1f1f1f;
  --footer-fg: #888888;
}

body.dark-mode a[href^="mailto:"] {
  color: #ffffff !important;
}

/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--fg);
  transition: background .3s, color .3s;
}
a {
  color: var(--button-bg);
  text-decoration: none;
  transition: color .3s;
}
a:hover { color: var(--button-hover); }

/* === HEADER === */
#header {
  position: fixed; top: 0; left: 0; width: 100%;
  background: var(--header-bg);
  z-index: 100;
  transition: background .3s;
}
.header-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 10px 40px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
.theme-toggle, .menu-toggle {
  background: transparent; border: none;
  color: var(--fg); font-size: 1.5em; cursor: pointer;
  margin-left: 20px;
}
.top-nav {
  position: absolute; top: 100%; left: 0; width: 100%;
  background: var(--nav-bg); max-height: 0; overflow: hidden;
  transition: max-height .3s, background .3s;
}
.top-nav.active { max-height: 300px; }
.top-nav ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column;
}
.top-nav li { border-bottom: 1px solid rgba(0,0,0,0.1); }
.top-nav a {
  display: block; padding: 15px;
  color: var(--fg); transition: background .3s;
}
.top-nav a:hover { background: var(--nav-hover); }
@media (min-width: 768px) {
  .menu-toggle { display: none; }
  .top-nav { position: static; display: block; max-height: none; background: none; }
  .top-nav ul { flex-direction: row; justify-content: flex-end; }
  .top-nav li { border: none; margin-left: 30px; }
  .top-nav a { padding: 10px 15px; }
}

/* === MAIN CONTENT === */
.wrapper {
  max-width: 1000px;
  margin: 60px auto 40px;
  padding: 0 40px;
}
.section { margin-bottom: 60px; }

/* About Me */
#about .about-container {
  display: flex; flex-wrap: wrap; align-items: center; gap: 20px;
}
#about .about-text { flex: 1 1 300px; }
#about .profile-img {
  flex: 0 0 200px; width: 200px; height: 200px;
  border-radius: 50%; object-fit: cover;
}

/* Buttons */
.button-group {
  display: flex; gap: 15px; margin-top: 20px;
}
.button {
  background: var(--button-bg);
  color: #fff;
  padding: 10px 20px;
  border-radius: 4px;
  transition: background .3s;
}
.button:hover {
  background: var(--button-hover);
  color: #fff;
}

/* Research Highlights Grid */
#highlights .highlights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.highlight-item {
  text-align: center;
}
.highlight-item img {
  width: 100%; height: auto;
  border-radius: 4px; object-fit: cover;
}
.highlight-item figcaption {
  margin-top: 10px; font-weight: 500;
}

/* === FOOTER === */
.footer {
  width: 100%; background: var(--footer-bg);
  color: var(--footer-fg);
  transition: background .3s, color .3s;
}
.footer-inner {
  max-width: 1000px; margin: 0 auto;
  padding: 20px 40px; text-align: center;
}

.spaced-filter-buttons {
  margin-top: 2rem; /* adjust value as needed */
}

/* ===== PUBLICATION ENHANCEMENTS ===== */
.section-title {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--button-bg);
}

.publication-year-heading {
  font-size: 1.75rem;
  color: var(--button-bg);
  margin: 2rem 0 1.5rem;
  padding-left: 0.5rem;
  border-left: 4px solid currentColor;
}

.publication-item {
  background: var(--nav-bg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  transition: transform 0.2s ease;
}

.publication-item:hover {
  transform: translateY(-2px);
}

.publication-title {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  line-height: 1.4;
  color: var(--heading-fg);
}

.publication-meta {
  margin-bottom: 1rem;
}

.authors {
  color: var(--fg);
  margin-bottom: 0.25rem;
}

.journal {
  color: var(--footer-fg);
  font-style: italic;
}

.paper-link {
  background: var(--button-hover);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.paper-link i {
  font-size: 0.9em;
}

.scholar-link {
  background: #4285f4;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.scholar-link:hover {
  background: #357abd;
}

.filter-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

  .publication-title {
    font-size: 1rem;
  }
  
  .filter-buttons {
    gap: 0.5rem;
  }

  /* Selected Publications styling */
#selected-pubs .publication-item {
  padding: 1rem;
  margin-bottom: 1rem;
}

#selected-pubs .publication-title {
  font-size: 1rem !important;
  margin-bottom: 0.5rem;
}

#selected-pubs .publication-meta {
  margin-bottom: 0.5rem;
}

/* Research Page Specific Styles */
.research-overview {
  font-size: 1.1rem;
  line-height: 1.7;
  max-width: 800px;
  margin: 2rem auto;
  color: var(--fg);
}

.research-interests {
  display: grid;
  gap: 2rem;
  margin-top: 3rem;
}

.research-item {
  background: var(--nav-bg);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.research-item h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  margin-bottom: 1rem;
  color: var(--heading-fg);
}

.research-item p {
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: var(--fg);
}

/* Conferences Section */
.conference-list {
  max-width: 1000px;
  margin: 2rem auto 0;
}

.conference-item {
  background: var(--nav-bg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.conference-date {
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  color: var(--heading-fg);
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--button-bg);
  padding-bottom: 0.5rem;
}

.conference-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.conference-title {
  font-size: 1.1rem;
  color: var(--heading-fg);
  margin: 0;
}

.conference-location {
  font-size: 0.9rem;
  color: var(--footer-fg);
  font-style: italic;
}

.presentation-info {
  padding-left: 1rem;
  border-left: 3px solid var(--button-bg);
}

.presentation-type {
  display: inline-block;
  font-size: 0.85rem;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  background: var(--button-bg);
  color: #fff;
  margin-bottom: 0.5rem;
}

.presentation-type.oral {
  background: #2e7d32;
}

.presentation-title {
  color: var(--fg);
  margin: 0;
  line-height: 1.4;
}

/* CV Page Styles */
.cv-section {
  margin: 2rem 0;
}

.cv-section-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  color: var(--heading-fg);
  border-bottom: 2px solid var(--button-bg);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.cv-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--nav-bg);
  border-radius: 8px;
}

.cv-date {
  font-weight: 500;
  color: var(--button-bg);
}

.institution {
  color: var(--footer-fg);
  margin: 0.5rem 0;
}

.thesis-title {
  font-style: italic;
  color: var(--fg);
  margin: 1rem 0 0.5rem;
}

.thesis-desc {
  line-height: 1.7;
  color: var(--fg);
}

.awards-grid {
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.award-item {
  display: flex;
  gap: 2rem;
  padding: 0.8rem;
  border-bottom: 1px solid rgba(0,0,0,0.1);
}

.skills-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.skills-list {
  list-style: none;
  padding-left: 1.5rem;
}

.skills-list li::before {
  content: "•";
  color: var(--button-bg);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

/* CV Page Styles */
.cv-date {
  font-weight: 600;
  color: var(--heading-fg); /* Changed from button-bg to heading color */
  margin-bottom: 0.5rem;
  font-size: 1rem;
  padding: 0.25rem 0.75rem;
  background: rgba(13, 59, 102, 0.1); /* Subtle background */
  border-radius: 4px;
  display: inline-block;
}

/* Dark mode adjustment */
body.dark-mode .cv-date {
  background: rgba(224, 224, 224, 0.1);
  color: var(--fg);
}

/* Contact Page Styles */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.contact-form .form-group {
  margin-bottom: 1.5rem;
}

.contact-form label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--heading-fg);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--button-bg);
  border-radius: 4px;
  background: var(--nav-bg);
  color: var(--fg);
  transition: border-color 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--button-hover);
}

.info-card {
  background: var(--nav-bg);
  padding: 2rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  text-align: center;
}

.info-card i {
  font-size: 2rem;
  color: var(--button-bg);
  margin-bottom: 1rem;
}

.info-card h3 {
  margin: 0.5rem 0;
  color: var(--heading-fg);
}

.social-section {
  margin-top: 3rem;
  text-align: center;
}

.social-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
}

.social-links a {
  font-size: 2rem;
  color: var(--button-bg);
  transition: transform 0.3s ease, color 0.3s ease;
}

.social-links a:hover {
  transform: translateY(-3px);
  color: var(--button-hover);
}


@media (max-width: 768px) {
  /* Research Highlights */
  #highlights .highlights-grid { grid-template-columns: 1fr; gap: 1rem; }
  .highlight-item { margin-bottom: 1rem; }

  /* Publications and selected-pubs */
  .publication-title { font-size: 1rem !important; }
  .publication-meta,
  #selected-pubs .publication-meta { margin-bottom: 0.5rem; }
  .filter-buttons { gap: 0.5rem; }
  .paper-link { margin-top: 1rem; }

  /* CV page */
  .cv-item { grid-template-columns: 1fr; gap: 1rem; }
  .award-item { flex-direction: column; gap: 0.5rem; }

  /* Contact page */
  .contact-container { grid-template-columns: 1fr; }
  .social-links { gap: 1.5rem; }
  .info-card { padding: 1.5rem; }

  /* Research items */
  .research-item { padding: 1.5rem; }
  .research-item h3 { font-size: 1.2rem; }
}