/* 1. THEME VARIABLES */
:root {
    --bg-color: #ffffff;
    --text-color: #333;
    --secondary-text-color: #6c757d;
    --heading-color: #343a40;
    --border-color: #ddd;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --card-shadow-hover: rgba(0, 0, 0, 0.15);
    --primary-color: #007bff;
    --primary-darker: #0056b3;
    --navbar-bg: #f8f9fa;
    --timeline-line-color: #f0f0f0;
    --scrollbar-track-color: #f0f0f0;
    --scrollbar-thumb-color: #c0c0c0;
    --scrollbar-thumb-hover-color: #a0a0a0;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --secondary-text-color: #a0a0a0;
    --heading-color: #ffffff;
    --border-color: #444;
    --card-bg: #1e1e1e;
    --card-shadow: rgba(0, 0, 0, 0.4);
    --card-shadow-hover: rgba(0, 0, 0, 0.6);
    --primary-color: #3391ff;
    --primary-darker: #58a6ff;
    --navbar-bg: #1e1e1e;
    --timeline-line-color: #444;
    --scrollbar-track-color: #2c2c2c;
    --scrollbar-thumb-color: #555;
    --scrollbar-thumb-hover-color: #777;
}

/* 2. GENERAL STYLES */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-size: 1.1rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--heading-color);
}

section {
    padding: 40px 0;
}

body.dark-mode .text-muted {
  color: var(--secondary-text-color) !important;
}

/* Navbar */
.navbar {
    background-color: var(--navbar-bg) !important;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}
.navbar-brand, .nav-link {
    color: var(--text-color) !important;
}
.nav-link.active {
    color: var(--primary-color) !important;
}
#darkModeToggle {
  color: var(--text-color);
}

/* Footer */
footer.bg-light {
    background-color: var(--navbar-bg) !important;
    border-top: 1px solid var(--border-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

/* Profile Photo */
.profile-photo {
    max-width: 200px;
    border: 5px solid var(--border-color);
    box-shadow: 0 4px 8px var(--card-shadow);
}

/* Social Media Icons */
.social-icons a {
    color: var(--text-color) !important;
    transition: color 0.3s ease;
}
.social-icons a:hover {
    color: var(--primary-color) !important;
}

/* Publication Card Styling */
.publication-card {
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}
.publication-card:hover {
    box-shadow: 0 6px 12px var(--card-shadow-hover);
}

/* ---- NEW STYLE FOR PUBLICATION IMAGES ---- */
.publication-card img {
    height: 250px; /* Sets a fixed height for all images */
    width: 100%;
    object-fit: cover; /* Ensures image fills the space without distortion */
    padding: 1.75rem; /* Adds space around the image */
    background-color: var(--card-bg); /* Ensures padding has a background */
}

.publication-card .card-title a {
    color: var(--primary-color);
}
body.dark-mode .publication-card {
    color: var(--text-color);
}

/* Experience Section Styling */
.experience-item h4 {
    color: var(--primary-darker);
}
.company-logo {
    max-width: 80px;
    height: auto;
    border-radius: 8px;
    background-color: #fff;
    padding: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.07);
}

/* Education Section */
.education-item {
    border-left: 4px solid var(--primary-color);
    background-color: var(--navbar-bg);
    transition: background-color 0.3s ease;
}

/* News Timeline Section */
.timeline {
    position: relative;
    padding-left: 40px;
    border-left: 3px solid var(--timeline-line-color);
    max-height: 350px;
    overflow-y: auto;
    padding-right: 15px;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -49px;
    top: 5px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: 4px solid var(--bg-color);
    transition: all 0.3s ease;
}
.timeline-date {
    color: var(--primary-darker);
}

/* Custom Scrollbar */
.timeline::-webkit-scrollbar {
  width: 8px;
}
.timeline::-webkit-scrollbar-track {
  background: var(--scrollbar-track-color);
  border-radius: 4px;
}
.timeline::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb-color);
  border-radius: 4px;
}
.timeline::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover-color);
}