/* Custom styles for academic website */
/* Color scheme: Ocean Blue & Golden Yellow */

:root {
  --primary-blue: #1a4b6e;
  --dark-blue: #0d2840;
  --light-blue: #e8f4f8;
  --accent-yellow: #d4a84b;
  --accent-gold: #c9942e;
  --text-dark: #2c3e50;
  --text-light: #ffffff;
}

/* Hero Banner */
.hero-banner {
  position: relative;
  width: 100%;
  height: 300px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.hero-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(26, 75, 110, 0.8));
  padding: 2rem;
  color: var(--text-light);
}

/* Navbar styling */
.navbar {
  background-color: var(--primary-blue) !important;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand, .nav-link {
  color: var(--text-light) !important;
}

.nav-link:hover {
  color: var(--accent-yellow) !important;
}

.nav-link.active {
  border-bottom: 2px solid var(--accent-yellow);
}

/* Headings */
h1, h2, h3, h4 {
  color: var(--primary-blue);
}

h1 {
  border-bottom: 3px solid var(--accent-yellow);
  padding-bottom: 0.5rem;
  display: inline-block;
}

/* Links */
a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Profile image styling */
.about-image {
  border: 4px solid var(--primary-blue) !important;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Buttons */
.btn-primary, .about-link {
  background-color: var(--primary-blue) !important;
  border-color: var(--primary-blue) !important;
  color: var(--text-light) !important;
}

.btn-primary:hover, .about-link:hover {
  background-color: var(--dark-blue) !important;
  border-color: var(--dark-blue) !important;
}

/* About links (social icons) */
.about-links .about-link {
  background-color: var(--primary-blue) !important;
  border: 2px solid var(--primary-blue) !important;
  margin: 0.2rem;
  transition: all 0.2s ease;
}

.about-links .about-link:hover {
  background-color: var(--accent-yellow) !important;
  border-color: var(--accent-yellow) !important;
  color: var(--dark-blue) !important;
}

/* Callouts */
.callout-note {
  border-left-color: var(--primary-blue);
  background-color: var(--light-blue);
}

.callout-tip {
  border-left-color: var(--accent-yellow);
}

/* Tables */
table {
  font-size: 0.95em;
}

table thead {
  background-color: var(--primary-blue);
  color: var(--text-light);
}

table tbody tr:nth-child(even) {
  background-color: var(--light-blue);
}

/* Footer */
.nav-footer {
  background-color: var(--dark-blue) !important;
  color: var(--text-light);
  padding: 1.5rem 0;
}

.nav-footer a {
  color: var(--accent-yellow) !important;
}

/* Code blocks */
pre {
  background-color: var(--light-blue);
  border: 1px solid #ccd9e0;
  border-radius: 6px;
}

/* Cards/sections */
.card {
  border: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  border-top: 3px solid var(--accent-yellow);
}

/* Research interests list styling */
.about-contents ul {
  list-style: none;
  padding-left: 0;
}

.about-contents ul li::before {
  content: "▸";
  color: var(--accent-yellow);
  font-weight: bold;
  margin-right: 0.5rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero-banner {
    height: 200px;
  }
  
  .about-image {
    max-width: 150px;
  }
}

/* Improve readability */
p {
  line-height: 1.7;
}

/* Section separators */
hr {
  border: none;
  height: 2px;
  background: linear-gradient(to right, var(--primary-blue), var(--accent-yellow), var(--primary-blue));
  margin: 2rem 0;
}

/* Highlight boxes */
.highlight-box {
  background: linear-gradient(135deg, var(--light-blue) 0%, #ffffff 100%);
  border-left: 4px solid var(--accent-yellow);
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
}