/* Modern Academic Website - Inspired by ctanujit.org */

/* CSS Variables */
:root {
    --primary-blue: #527bbd;
    --dark-blue: #3a5a99;
    --light-blue: #6b94d1;
    --accent-orange: #e67e22;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #dee2e6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: Georgia, 'Times New Roman', serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Vollkorn', Georgia, serif;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.lead {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--text-dark);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation Bar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand a {
    font-family: 'Vollkorn', Georgia, serif;
    font-size: 2rem;
    font-weight: 900;
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition-fast);
    letter-spacing: -0.01em;
}

.nav-brand a:hover {
    color: var(--dark-blue);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
}

.nav-menu li {
    position: relative;
}

.nav-link {
    font-family: 'Bree Serif', Georgia, serif;
    font-size: 1rem;
    color: var(--text-dark);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--primary-blue);
    color: var(--bg-white);
}

.nav-link i {
    font-size: 0.8rem;
}

/* Dropdown Menu */
.nav-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-lg);
    border-radius: 4px;
    list-style: none;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    margin-top: 0.5rem;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    border-bottom: 1px solid var(--border-color);
}

.dropdown-menu li:last-child {
    border-bottom: none;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition-fast);
    font-family: Georgia, serif;
    font-size: 0.95rem;
}

.dropdown-menu a:hover {
    background-color: var(--bg-light);
    color: var(--primary-blue);
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition-normal);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--bg-white);
    margin-top: 70px;
    padding: 4rem 0;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.1)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,112C672,96,768,96,864,112C960,128,1056,160,1152,160C1248,160,1344,128,1392,112L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 5.5rem;
    margin-bottom: 0.5rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
    color: #ffffff;
}

/* Typing effect */
.hero-title::after {
    content: '|';
    color: #ffffff;
    animation: blink 0.7s infinite;
}

@keyframes blink {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0;
    }
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 400;
}

.hero-affiliation,
.hero-department {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 0.3rem;
}

.hero-links {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
}

.btn-secondary:hover {
    background-color: var(--bg-white);
    color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.social-links-hero {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
}

.social-links-hero a {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.2rem;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
}

.social-links-hero a:hover {
    background-color: var(--bg-white);
    color: var(--primary-blue);
    transform: translateY(-3px);
}

/* Profile Photo */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-photo-wrapper {
    position: relative;
    width: 300px;
    height: 300px;
}

.profile-photo {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--bg-white);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.photo-border {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.3);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.05);
        opacity: 1;
    }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}

.scroll-indicator a {
    color: var(--bg-white);
    font-size: 2rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Page Header (for non-home pages) */
.page-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    color: var(--bg-white);
    padding: 6rem 0 4rem;
    margin-top: 70px;
    text-align: center;
}

.page-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
    color: var(--bg-white);
}

.page-subtitle {
    font-size: 1.3rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
}

/* Sections */
.section {
    padding: 5rem 0;
}

.section.bg-light {
    background-color: var(--bg-light);
}

.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-blue), var(--accent-orange));
    border-radius: 2px;
}

.subsection-title {
    font-size: 1.8rem;
    margin-top: 3rem;
    margin-bottom: 2rem;
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.subsection-title i {
    color: var(--accent-orange);
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease-in forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.slide-up {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp 0.8s ease-out forwards;
}

.slide-up:nth-child(2) { animation-delay: 0.2s; }
.slide-up:nth-child(3) { animation-delay: 0.4s; }
.slide-up:nth-child(4) { animation-delay: 0.6s; }

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

/* Bio Section */
.bio-content {
    display: grid;
    gap: 3rem;
}

.bio-text p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.quick-facts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.fact-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    transition: var(--transition-normal);
}

.fact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.fact-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.fact-content h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-blue);
}

.fact-content p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
}

/* News Timeline */
.news-timeline {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    gap: 2rem;
}

.news-item {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    background-color: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    border-left: 4px solid var(--primary-blue);
}

.news-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
    border-left-color: var(--light-blue);
}

.news-date {
    font-family: 'Inconsolata', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-blue);
    min-width: 120px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.news-content {
    flex: 1;
}

.news-content h3 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.news-content p {
    color: var(--text-dark);
    line-height: 1.6;
    margin-bottom: 0.8rem;
}

.news-tag {
    display: inline-block;
    background-color: var(--light-blue);
    color: var(--bg-white);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

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

.interest-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border-top: 4px solid var(--primary-blue);
}

.interest-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-top-color: var(--light-blue);
}

.interest-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

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

.interest-card p {
    color: var(--text-light);
    line-height: 1.6;
    margin: 0;
}

/* Education Section */
.education-list {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    gap: 2.5rem;
}

.education-item {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    background-color: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    border-left: 5px solid var(--primary-blue);
    transition: var(--transition-normal);
    align-items: flex-start;
}

.education-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
    border-left-color: var(--light-blue);
}

.education-logo {
    flex-shrink: 0;
}

.university-logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 8px;
}

.education-content {
    flex: 1;
}

.education-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.8rem;
    gap: 1rem;
}

.education-item h3 {
    color: var(--primary-blue);
    font-size: 1.3rem;
    margin: 0;
    flex: 1;
}

.education-year {
    font-family: 'Inconsolata', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-light);
    white-space: nowrap;
}

.education-institution {
    color: var(--text-dark);
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.education-detail {
    color: var(--text-light);
    font-size: 0.95rem;
    margin: 0;
    font-style: italic;
}

/* Publications */
.publication-list {
    max-width: 900px;
}

.publication-item {
    display: flex;
    gap: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.pub-year {
    font-family: 'Inconsolata', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    min-width: 80px;
}

.pub-content {
    flex: 1;
}

.pub-title {
    font-size: 1.2rem;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.pub-authors {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.pub-venue {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.pub-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    background-color: var(--bg-light);
    color: var(--primary-blue);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid var(--primary-blue);
}

/* Projects */
.projects-grid {
    display: grid;
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--primary-blue);
    transition: var(--transition-normal);
}

.project-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--light-blue);
}

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

.project-header h4 {
    color: var(--primary-blue);
    margin: 0;
    flex: 1;
}

.project-period {
    font-family: 'Inconsolata', monospace;
    font-size: 0.9rem;
    color: var(--text-light);
    white-space: nowrap;
}

.project-institution {
    color: var(--text-light);
    margin-bottom: 1rem;
    font-style: italic;
}

.project-description ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.project-description li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.project-tech {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.project-tech i {
    color: var(--light-blue);
}

.tech-tag {
    background-color: var(--primary-blue);
    color: var(--bg-white);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-family: 'Inconsolata', monospace;
}

/* Applied Projects */
.applied-projects {
    display: grid;
    gap: 1.5rem;
}

.applied-project {
    padding: 1.5rem;
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.applied-project:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.applied-project h4 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.project-date {
    display: block;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
    font-style: italic;
}

.applied-project p {
    margin: 0;
    color: var(--text-dark);
    line-height: 1.6;
}

/* Teaching Section - Horizontal Layout */
.teaching-section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
}

.teaching-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.teaching-item {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 2rem;
    background-color: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    border-top: 4px solid var(--primary-blue);
    text-align: center;
}

.teaching-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-top-color: var(--light-blue);
}

.teaching-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.8rem;
    margin: 0 auto;
}

.teaching-content h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-blue);
    font-size: 1.1rem;
}

.teaching-level {
    font-size: 0.9rem;
    color: var(--light-blue);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.teaching-institution {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0;
    line-height: 1.5;
}

.supervision-list {
    display: grid;
    gap: 2rem;
    max-width: 900px;
}

.supervision-item {
    padding: 2rem;
    background-color: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--primary-blue);
    transition: var(--transition-normal);
}

.supervision-item:hover {
    border-left-color: var(--light-blue);
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.supervision-type {
    display: inline-block;
    background-color: var(--primary-blue);
    color: var(--bg-white);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.supervision-item h4 {
    margin-bottom: 0.8rem;
    color: var(--primary-blue);
    font-size: 1.1rem;
    line-height: 1.4;
}

.supervision-item p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
}

/* Awards Section - Horizontal Layout */
.awards-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.award-item {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 2rem;
    background-color: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    text-align: center;
    border-top: 4px solid var(--light-blue);
}

.award-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.award-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--light-blue), #f39c12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.8rem;
    margin: 0 auto;
}

.award-content h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-blue);
    font-size: 1.1rem;
}

.award-content p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
    font-size: 0.95rem;
}

.conference-list {
    display: grid;
    gap: 2rem;
    max-width: 900px;
}

.conference-item {
    padding: 2rem;
    background-color: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--primary-blue);
    transition: var(--transition-normal);
}

.conference-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--light-blue);
}

.conf-year {
    font-family: 'Inconsolata', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 0.8rem;
    display: block;
}

.conf-content h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-blue);
    font-size: 1.1rem;
    line-height: 1.4;
}

.conf-subtitle {
    color: var(--text-dark);
    font-weight: 600;
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}

.conf-desc {
    color: var(--text-light);
    font-size: 0.9rem;
    font-style: italic;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.conf-date {
    color: var(--text-light);
    font-size: 0.85rem;
    margin: 0;
}

/* Skills Section */
.skills-grid {
    display: grid;
    gap: 2rem;
}

.skill-category {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
}

.skill-category h3 {
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-category h3 i {
    color: var(--light-blue);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background-color: var(--bg-light);
    color: var(--text-dark);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.skill-tag:hover {
    background-color: var(--primary-blue);
    color: var(--bg-white);
    border-color: var(--primary-blue);
    transform: translateY(-2px);
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
}

.contact-info {
    display: grid;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: 10px;
    transition: var(--transition-normal);
}

.contact-item:hover {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

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

.contact-details a {
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition-fast);
}

.contact-details a:hover {
    color: var(--primary-blue);
}

.contact-details p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--primary-blue);
    color: var(--bg-white);
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.social-btn:hover {
    background-color: var(--dark-blue);
    transform: translateY(-2px);
}

.contact-cta {
    display: flex;
    align-items: center;
}

.cta-box {
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    color: var(--bg-white);
    padding: 3rem 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.cta-box h3 {
    color: var(--bg-white);
    margin-bottom: 1rem;
}

.cta-box p {
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-box .btn {
    margin: 0.5rem;
}

.cta-box .btn-primary {
    background-color: var(--bg-white);
    color: var(--primary-blue);
}

.cta-box .btn-primary:hover {
    background-color: var(--light-blue);
    color: var(--bg-white);
    border-color: var(--light-blue);
}

.cta-box .btn-secondary {
    background-color: transparent;
    border-color: var(--bg-white);
}

.cta-box .btn-secondary:hover {
    background-color: var(--bg-white);
    color: var(--primary-blue);
}

/* Footer */
.footer {
    background-color: var(--text-dark);
    color: var(--bg-white);
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-content p {
    margin: 0;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.1rem;
    transition: var(--transition-normal);
}

.footer-social a:hover {
    background-color: var(--primary-blue);
    transform: translateY(-3px);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    color: var(--bg-white);
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-links {
        justify-content: center;
    }

    .social-links-hero {
        justify-content: center;
    }

    .teaching-grid,
    .awards-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 1rem;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: var(--transition-normal);
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        margin-top: 0.5rem;
        margin-left: 1rem;
        background-color: var(--bg-light);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .profile-photo-wrapper {
        width: 200px;
        height: 200px;
    }

    .section-title {
        font-size: 2rem;
    }

    .interests-grid {
        grid-template-columns: 1fr;
    }

    .quick-facts {
        grid-template-columns: 1fr;
    }

    .fact-card {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-links {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .publication-item {
        flex-direction: column;
        gap: 1rem;
    }

    .project-header {
        flex-direction: column;
    }

    .conference-item {
        flex-direction: column;
        gap: 1rem;
    }

    .award-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .scroll-indicator,
    .back-to-top,
    .footer {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: 2rem 0;
    }

    .section {
        padding: 2rem 0;
        page-break-inside: avoid;
    }
}