/*
 * Custom styling for the personal website.
 *
 * This stylesheet defines a simple, responsive layout without relying on
 * external frameworks such as Bootstrap. It includes rules for the fixed
 * navigation bar, section spacing, profile image appearance, and basic
 * typography. The palette loosely follows the blue accent of the original
 * site.
 */

/* Reset and base styles */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: #333;
}

a {
  color: #990000;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: #FFCC00;
}

h1, h2, h3, h4, h5 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #1a1a1a;
}

/* Navigation bar */
#navbar {
  background-color: #f8f9fa;
  border-bottom: 1px solid #e5e5e5;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 0.5rem 1rem;
}

#navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
}

#navbar .brand {
  font-size: 1.25rem;
  font-weight: bold;
}

#navbar ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
}

#navbar li {
  margin-left: 1rem;
  position: relative;
}

#navbar a {
  color: #333;
  font-weight: 500;
  text-decoration: none;
  padding: 0.5rem;
  display: block;
}

#navbar a:hover {
  color: #990000;
}

/* Dropdown styles */
#navbar .dropdown-menu {
  display: none;
  position: absolute;
  background-color: #fff;
  border: 1px solid #e5e5e5;
  margin-top: 0.5rem;
  min-width: 200px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  z-index: 2000;
}

#navbar li:hover .dropdown-menu {
  display: block;
}

#navbar .dropdown-menu a {
  padding: 0.5rem 1rem;
  white-space: nowrap;
  color: #333;
}

#navbar .dropdown-menu a:hover {
  background-color: #f0f0f0;
  color: #990000;
}

/* Layout container */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Section spacing (account for fixed navbar) */
section {
  padding: 4rem 0;
}

/* Profile image and social links */
.profile-image {
  max-width: 270px;
  width: 100%;
  height: auto;
  border-radius: 50%;
}

.social-icons {
  margin-top: 1rem;
}

.social-icons a {
  margin-right: 1rem;
  font-weight: bold;
}

.social-icons a:last-child {
  margin-right: 0;
}

/* Education list styling */
.education-list {
  padding-left: 0;
  list-style: none;
}

.education-list li {
  margin-bottom: 0.75rem;
}

/* News and contact backgrounds */
#news, #contact {
  background-color: #f8f9fa;
}

/* Publication section styling */
.publication {
  border-bottom: 1px solid #e5e5e5;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
}

.publication:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.btn {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  background-color: #990000;
  color: #fff;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.btn:hover {
  background-color: #0d47a1;
}

/* Simple grid system inspired by Bootstrap for flexibility without external dependencies */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-left: -1rem;
  margin-right: -1rem;
}

.row > div {
  padding-left: 1rem;
  padding-right: 1rem;
}

/* Column classes for different breakpoints */
.col-12 {
  flex: 0 0 100%;
  max-width: 100%;
}

.col-lg-4 {
  flex: 0 0 33.3333%;
  max-width: 33.3333%;
}

.col-lg-8 {
  flex: 0 0 66.6667%;
  max-width: 66.6667%;
}

.col-md-5 {
  flex: 0 0 41.6667%;
  max-width: 41.6667%;
}

.col-md-7 {
  flex: 0 0 58.3333%;
  max-width: 58.3333%;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .col-lg-4,
  .col-lg-8 {
    flex: 0 0 100%;
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .col-md-5,
  .col-md-7 {
    flex: 0 0 100%;
    max-width: 100%;
  }
}

/* Make publication titles larger */
.publication-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

/* Make author names grey */
.publication-authors {
  color: #666;   /* soft grey */
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}