custom.css

/* Custom CSS - Plain Bootstrap Version */

/* CSS Variables for theming */
:root {
  --font-family-sans-serif: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --body-color: #2c3e50;
  --body-bg: #ffffff;
  --primary: #2c3e50;
  --secondary: #95a5a6;
  --link-color: #3498db;
  --link-hover-color: #2980b9;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-sans-serif);
  color: var(--body-color);
  line-height: 1.7;
}

/* Navbar */
.navbar {
  padding: 1rem 0;
  transition: all 0.3s ease;
}

.navbar .navbar-brand {
  font-size: 1.5rem;
  line-height: 32px;
  font-weight: 600;
  color: var(--primary);
}

.navbar .nav-link {
  font-weight: 500;
  color: var(--body-color);
  padding: 0.5rem 1.5rem;
  transition: color 0.3s ease;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--link-color);
}

/* Section spacing */
section {
  padding: 5rem 0;
}

@media (max-width: 768px) {
  section {
    padding: 3rem 0;
  }
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 3rem;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 2rem;
  }
}

/* Hero/About Section */
.hero-about-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 6rem;
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

.profile-photo-wrapper {
  max-width: 280px;
  margin: 0 auto;
}

.profile-photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border: 4px solid #ffffff;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.social-links .btn {
  border-radius: 50px;
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.social-links .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

@media (min-width: 992px) {
  .hero-about-section {
    padding-top: 8rem;
  }

  .bio-content {
    margin-left: 3rem;
  }
}

.bio-content p {
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

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

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

.bio-content .lead {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--body-color);
}

.research-interests {
  list-style: none;
  padding-left: 0;
}

.research-interests li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.research-interests li:before {
  content: "\2192";
  position: absolute;
  left: 0;
  color: var(--link-color);
  font-weight: bold;
}

/* Scroll indicator */
.scroll-indicator .scroll-arrow {
  animation: bounce 2s infinite;
  display: inline-block;
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }

  40% {
    transform: translateY(-10px);
  }

  60% {
    transform: translateY(-5px);
  }
}

/* Projects Section */
.projects-section {
  background-color: #ffffff;
}

.filter-buttons .btn-filter {
  margin: 0.25rem;
  padding: 0.5rem 1.5rem;
  border: 2px solid #e0e0e0;
  background: #ffffff;
  color: var(--body-color);
  border-radius: 50px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.filter-buttons .btn-filter:hover {
  border-color: var(--link-color);
  color: var(--link-color);
  transform: translateY(-2px);
}

.filter-buttons .btn-filter.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

/* Project Cards */
.project-card .card {
  border: none;
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.project-card .card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15) !important;
}

.project-card .card .card-img-top {
  aspect-ratio: 1;
  object-fit: cover;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  border-radius: 12px 12px 0 0;
}

.project-card .card .card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.project-card .card .card-title {
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--primary);
}

.project-card .card .card-text {
  color: #6c757d;
  font-size: 0.95rem;
  line-height: 1.6;
  flex-grow: 1;
}

/* Project links with icons */
.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  row-gap: 0.25rem;
  align-items: center;
  margin-top: auto;
  line-height: 1.2;
}

.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--link-color);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  padding: 0.1rem 0;
  line-height: 1.2;
}

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

.project-links a svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.project-links .link-separator {
  color: #dee2e6;
  font-weight: 300;
}

/* Fade in animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Talks Section */
.talks-section {
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

.talks-section .card {
  border: none;
  border-radius: 12px;
  transition: all 0.3s ease;
}

.talks-section .card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1) !important;
}

.talks-section .card .card-body {
  display: flex;
  flex-direction: column;
}

.talks-section .card .card-text {
  flex-grow: 1;
}

.talks-section .card .btn {
  margin-top: auto;
}

.talks-section .card .badge {
  font-weight: 500;
  padding: 0.5rem 0.75rem;
}

/* Contact Section */
.contact-section {
  background-color: #ffffff;
  padding: 4rem 0;
}

.contact-section .contact-links .btn {
  padding: 0.75rem 2rem;
  border-radius: 50px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.contact-section .contact-links .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

/* Footer */
.footer {
  background-color: #f8f9fa;
  border-top: 1px solid #e9ecef;
}

.footer a {
  transition: color 0.3s ease;
}

.footer a:hover {
  color: var(--link-color) !important;
}

/* Buttons */
.btn {
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.btn-outline-primary {
  color: var(--link-color);
  border-color: var(--link-color);
}

.btn-outline-primary:hover {
  background-color: var(--link-color);
  border-color: var(--link-color);
  color: #ffffff;
}

/* Responsive adjustments */
@media (max-width: 991px) {
  .hero-about-section {
    padding-top: 7rem;
  }

  .profile-photo-wrapper {
    max-width: 220px;
  }
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.75rem;
  }

  h1.display-4 {
    font-size: 2rem;
  }

  .filter-buttons .btn-filter {
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
  }
}