:root {
  /* Dark theme colors */
  --bg-primary: #111827; /* Slightly lighter than #0f172a */
  --bg-secondary: #1f2937; /* Softer, less harsh than #1e293b */
  --bg-accent: #334155; /* Lighter for less contrast with text */
  --text-primary: #f1f5f9; /* A bit lighter for readability */
  --text-secondary: #d1d5db; /* Lighter gray for better contrast */
  --text-accent: #a1aab8; /* Softer accent color */
  --primary: #4f8af7; /* Brighter blue for a more dynamic feel */
  --primary-dark: #3366d6; /* Deepened the dark variant for contrast */
  --primary-light: #72b0fc; /* Vibrant light blue */
  --accent: #a163f7; /* A more vivid purple for accents */
  --success: #38d878; /* A fresher, more visible green */
  --card-bg: #232f3e; /* A slightly more distinct card background */
  --card-border: #3b4451; /* More definition for borders */
  --nav-bg: rgba(17, 24, 39, 0.9); /* Slightly lighter for better transparency */
}


* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2rem;
}


a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.3s;
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 0;
  background: linear-gradient(to bottom, var(--bg-primary), var(--bg-secondary));
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  background: linear-gradient(to right, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--text-primary);
}

/* Grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

/* Publications */
.publication-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.publication-type {
  color: var(--primary);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

/* Timeline */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline-item {
  margin-bottom: 2rem;
  padding-left: 2rem;
  border-left: 2px solid var(--primary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--bg-primary);
}

/* Footer */
footer {
  background: var(--bg-secondary);
  padding: 3rem 0;
  margin-top: 4rem;
  border-top: 1px solid var(--card-border);
}

/* Media Queries */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .section {
    padding: 4rem 0;
  }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

/* Language Badges */
.language-level {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge {
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
}

/* Skills Grid */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: var(--bg-accent);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

/* Timeline Styles */
.timeline-item .card {
    position: relative;
    margin-left: 2rem;
}

.timeline-item .card::before {
    content: '';
    position: absolute;
    left: -2.5rem;
    top: 1.5rem;
    width: 1rem;
    height: 1rem;
    background: var(--primary);
    border-radius: 50%;
}

.timeline-date {
    color: var(--text-accent);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.institution {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Certification List */
.cert-list {
    list-style: none;
    padding: 0;
}

.cert-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--card-border);
}

.cert-list li:last-child {
    border-bottom: none;
}

/* About Hero Section */
.about-hero {
    min-height: 60vh;
}

/* Research Page Styles */
.research-card {
    position: relative;
    overflow: hidden;
}

.card-icon {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

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

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

.research-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.achievement-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 1rem;
}

/* Publications Page Styles */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.stat-card {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.review-card {
    text-align: center;
}

.review-count {
    color: var(--text-accent);
    margin: 0.5rem 0;
}

.achievement-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary);
    color: var(--bg-primary);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    margin-top: 1rem;
}

.filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    color: var(--bg-primary);
}

.publications-grid {
    display: grid;
    gap: 2rem;
}

/* Common Hero Modifications */
.research-hero,
.publications-hero {
    min-height: 60vh;
    background: linear-gradient(to bottom right, var(--bg-primary), var(--bg-secondary));
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-btn {
        width: 100%;
    }
}


/* Project Page Styles */
.project-card {
    display: flex;
    flex-direction: column;
}

.major-project {
    grid-column: 1 / -1;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.project-date {
    color: var(--text-accent);
    font-size: 0.875rem;
}

.project-subtitle {
    color: var(--primary);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.project-info {
    margin-bottom: 0.5rem;
}

.info-label {
    color: var(--text-accent);
    font-size: 0.875rem;
    display: block;
}

.project-achievements {
    margin-top: 1rem;
}

.project-achievements h4 {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.project-achievements ul {
    list-style: none;
    padding-left: 1.5rem;
}

.project-achievements li {
    position: relative;
    margin-bottom: 0.5rem;
}

.project-achievements li::before {
    content: "→";
    position: absolute;
    left: -1.5rem;
    color: var(--primary);
}

/* Students Page Styles */
.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-button {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-button:hover,
.tab-button.active {
    background: var(--primary);
    color: var(--bg-primary);
}

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

.course-card {
    display: flex;
    flex-direction: column;
}

.course-details {
    margin-top: 1rem;
}

.course-details h4 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.contact-card {
    text-align: center;
    padding: 3rem 2rem;
}

.contact-card h2 {
    margin-bottom: 1rem;
}

/* Continuing Students Page Styles */
.contact-card {
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(145deg, var(--card-bg), var(--bg-accent));
}

.contact-buttons {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.supervision-content {
    margin-top: 2rem;
}

.thesis-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.thesis-card:hover {
    transform: translateX(10px);
}

.thesis-year {
    color: var(--primary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.thesis-author {
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.thesis-title {
    color: var(--text-secondary);
    font-style: italic;
}

.course-semester {
    display: inline-block;
    background: var(--primary);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

/* Animation classes */
.slide-in {
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.6s ease;
}

.slide-in.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .tabs {
        flex-direction: column;
    }
    
    .tab-button {
        width: 100%;
    }
    
    .contact-buttons {
        flex-direction: column;
    }
    
    .thesis-card {
        margin: 1rem 0;
    }
}

/* Category badges */
.category-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.category-badge.master {
    background: var(--primary);
    color: var(--bg-primary);
}

.category-badge.research {
    background: var(--accent);
    color: var(--bg-primary);
}

.category-badge.bachelor {
    background: var(--success);
    color: var(--bg-primary);
}

#searchInput {color: lightgray; background: black; border:1px solid lightgray; border-radius: 5px; padding: 6px}

.tag {background: darkblue; margin: 5px; font-size: 8pt}


  

        #searchInput {
            width: 100%;
            max-width: 400px;
            padding: 8px;
            margin: 10px 0;
            border: 1px solid #ddd;
            border-radius: 4px;
        }


        .tags {
            margin-top: 10px;
        }

        #publications-grid {
            display: grid;
            grid-gap: 20px;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        }



        /* Hobbies Page Styles */
.hobby-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.hobby-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.hobby-icon {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.hobby-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.hobby-list li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.hobby-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary);
}

.hobby-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    margin-top: auto;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.hobby-link:hover {
    color: var(--primary-light);
}

/* Track Grid */
.tracks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.track-card {
    overflow: hidden;
}

.track-image {
    position: relative;
    padding-top: 75%; /* 4:3 aspect ratio */
    overflow: hidden;
    border-radius: 0.5rem;
    margin: -1.5rem -1.5rem 1.5rem -1.5rem;
}

.track-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.track-card:hover .track-image img {
    transform: scale(1.05);
}

.track-content {
    padding: 1rem 0;
}

.track-meta {
    display: flex;
    gap: 1rem;
    margin: 0.5rem 0 1rem;
    font-size: 0.875rem;
    color: var(--text-accent);
}

.track-type {
    color: var(--primary);
}

/* Community Section */
.community-card {
    max-width: 800px;
    margin: 0 auto;
}

.community-list {
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}

.community-list li {
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-left: 3px solid var(--primary);
    background: var(--bg-accent);
    border-radius: 0 0.5rem 0.5rem 0;
}