/* ============================================
   PhD Researcher Portfolio - Premium Styles
   ============================================ */

/* CSS Variables for consistent theming */
:root {
    --primary-color: #1e3a5f;
    --primary-light: #2d5a87;
    --primary-dark: #0f1f33;
    --accent-color: #4a90d9;
    --accent-light: #7bb3eb;
    --accent-gradient: linear-gradient(135deg, #4a90d9 0%, #2d5a87 100%);
    --gold-accent: #d4af37;
    --text-dark: #1a1a2e;
    --text-muted: #4a5568;
    --text-light: #6b7280;
    --bg-light: #f8fafd;
    --bg-white: #ffffff;
    --bg-gradient: linear-gradient(135deg, #f8fafd 0%, #e8f0fe 100%);
    --border-color: #e5e9f0;
    --shadow-sm: 0 2px 8px rgba(30, 58, 95, 0.08);
    --shadow-md: 0 8px 24px rgba(30, 58, 95, 0.12);
    --shadow-lg: 0 16px 48px rgba(30, 58, 95, 0.15);
    --shadow-glow: 0 0 40px rgba(74, 144, 217, 0.15);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Merriweather', Georgia, serif;
    font-weight: 700;
    line-height: 1.35;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

::selection {
    background-color: var(--accent-color);
    color: white;
}

/* ============================================
   Navigation - Glassmorphism Style
   ============================================ */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 18px 0;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-bottom: 1px solid rgba(229, 233, 240, 0.5);
}

.navbar.scrolled {
    padding: 12px 0;
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.98);
}

.navbar-brand {
    font-family: 'Merriweather', serif;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary-color) !important;
    letter-spacing: -0.03em;
}

.brand-name {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-toggler {
    border: 2px solid var(--primary-color);
    padding: 0.5rem 0.75rem;
    color: var(--primary-color);
    border-radius: 8px;
    transition: var(--transition-fast);
}

.navbar-toggler:hover {
    background-color: var(--primary-color);
    color: white;
}

.navbar-toggler:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.3);
}

.navbar-nav .nav-link {
    color: var(--text-muted) !important;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 10px 18px !important;
    margin: 0 3px;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition);
    transform: translateX(-50%);
    border-radius: 2px;
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 60%;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary-color) !important;
    background-color: rgba(74, 144, 217, 0.08);
}

/* ============================================
   Hero Section - Premium Design
   ============================================ */
.hero-section {
    background: var(--bg-gradient);
    padding-top: 120px;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, rgba(74, 144, 217, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -20%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.profile-image-wrapper {
    position: relative;
    display: inline-block;
}

.profile-image-wrapper::before {
    content: '';
    position: absolute;
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
    background: var(--accent-gradient);
    border-radius: 50%;
    z-index: -1;
    opacity: 0.3;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.05); opacity: 0.5; }
}

.profile-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid var(--bg-white);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transition: var(--transition);
}

.profile-image:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-lg), 0 0 60px rgba(74, 144, 217, 0.25);
}

.hero-content {
    padding-left: 30px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.6rem;
    font-weight: 500;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    font-family: 'Open Sans', sans-serif;
}

.hero-affiliation {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 24px;
    line-height: 2.2;
}

.hero-affiliation i {
    color: var(--accent-color);
    margin-right: 10px;
    width: 22px;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    max-width: 620px;
    line-height: 1.85;
}

.hero-buttons {
    margin-bottom: 28px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.btn-primary-custom {
    background: var(--accent-gradient);
    color: var(--bg-white);
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.95rem;
    border: none;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(74, 144, 217, 0.35);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary-custom:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(74, 144, 217, 0.45);
    color: var(--bg-white);
}

.btn-outline-custom {
    background-color: transparent;
    color: var(--primary-color);
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.95rem;
    border: 2px solid var(--primary-color);
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-outline-custom:hover {
    background: var(--primary-color);
    color: var(--bg-white);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(30, 58, 95, 0.3);
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-white);
    color: var(--primary-color);
    font-size: 1.2rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.social-links a:hover {
    background: var(--accent-gradient);
    color: var(--bg-white);
    transform: translateY(-4px) rotate(5deg);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

/* ============================================
   Section Common Styles
   ============================================ */
.section-padding {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 18px;
    position: relative;
    display: inline-block;
}

.title-underline {
    width: 80px;
    height: 4px;
    background: var(--accent-gradient);
    margin: 0 auto 24px;
    border-radius: 4px;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.15rem;
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.7;
}

.bg-light {
    background: var(--bg-gradient) !important;
}

/* ============================================
   About Section
   ============================================ */
.about-content {
    max-width: 950px;
    margin: 0 auto;
}

.about-content .lead {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 24px;
    font-weight: 500;
    line-height: 1.8;
}

.about-content p {
    color: var(--text-muted);
    margin-bottom: 18px;
    font-size: 1.05rem;
}

.info-card {
    background: var(--bg-white);
    padding: 35px 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.info-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.info-card:hover::before {
    opacity: 1;
}

.info-card i {
    font-size: 2.8rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 18px;
    display: block;
}

.info-card h5 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1.15rem;
}

.info-card p {
    margin-bottom: 0;
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* ============================================
   Research Section
   ============================================ */
.research-card {
    background: var(--bg-white);
    padding: 35px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    transition: var(--transition);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.research-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(74, 144, 217, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.research-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-light);
}

.research-icon {
    flex-shrink: 0;
    width: 70px;
    height: 70px;
    background: var(--accent-gradient);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 24px;
    box-shadow: 0 8px 20px rgba(74, 144, 217, 0.3);
    transition: var(--transition);
}

.research-card:hover .research-icon {
    transform: scale(1.1) rotate(5deg);
}

.research-icon i {
    font-size: 1.7rem;
    color: var(--bg-white);
}

.research-content h4 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.research-content p {
    color: var(--text-muted);
    margin-bottom: 0;
    font-size: 0.98rem;
    line-height: 1.7;
}

/* ============================================
   Publications Section
   ============================================ */
.publications-list {
    max-width: 950px;
    margin: 0 auto;
}

.publication-item {
    display: flex;
    padding: 30px;
    background: var(--bg-white);
    border-radius: 16px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.publication-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--accent-color);
}

.publication-item:last-child {
    margin-bottom: 0;
}

.publication-year {
    flex-shrink: 0;
    width: 80px;
    font-weight: 800;
    font-size: 1.1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.publication-content {
    flex-grow: 1;
}

.publication-title {
    font-size: 1.15rem;
    margin-bottom: 10px;
}

.publication-title a {
    color: var(--primary-color);
    transition: var(--transition-fast);
}

.publication-title a:hover {
    color: var(--accent-color);
}

.publication-authors {
    color: var(--text-muted);
    margin-bottom: 6px;
    font-size: 0.98rem;
}

.publication-venue {
    color: var(--text-light);
    margin-bottom: 12px;
    font-size: 0.92rem;
}

.publication-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.pub-link {
    font-size: 0.85rem;
    color: var(--bg-white);
    background: var(--accent-gradient);
    padding: 6px 14px;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    transition: var(--transition);
    font-weight: 600;
}

.pub-link i {
    margin-right: 6px;
}

.pub-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 144, 217, 0.35);
    color: var(--bg-white);
}

/* ============================================
   Education Timeline
   ============================================ */
.timeline {
    position: relative;
    max-width: 850px;
    margin: 0 auto;
    padding-left: 50px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 18px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent-gradient);
    border-radius: 3px;
}

.timeline-item {
    position: relative;
    padding-bottom: 50px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -40px;
    top: 8px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: 4px solid var(--bg-white);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.3);
    box-shadow: 0 0 20px rgba(74, 144, 217, 0.5);
}

.timeline-content {
    background: var(--bg-white);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.timeline-item:hover .timeline-content {
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.timeline-date {
    display: inline-block;
    background: var(--accent-gradient);
    color: var(--bg-white);
    padding: 6px 16px;
    border-radius: 25px;
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 14px;
    box-shadow: 0 4px 12px rgba(74, 144, 217, 0.3);
}

.timeline-title {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.timeline-institution {
    font-size: 1.05rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 14px;
    font-family: 'Open Sans', sans-serif;
}

.timeline-institution i {
    margin-right: 10px;
    color: var(--accent-color);
}

.timeline-description {
    color: var(--text-muted);
    font-size: 0.98rem;
    margin-bottom: 0;
    line-height: 1.85;
}

/* ============================================
   Teaching Section
   ============================================ */
.teaching-card {
    background: var(--bg-white);
    padding: 35px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    height: 100%;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.teaching-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: var(--transition);
}

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

.teaching-card:hover::before {
    transform: scaleX(1);
}

.teaching-card h4 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.teaching-card h4 i {
    margin-right: 12px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.teaching-period {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 18px;
    display: inline-block;
}

.teaching-list {
    padding-left: 22px;
    margin-bottom: 18px;
}

.teaching-list li {
    color: var(--text-muted);
    margin-bottom: 10px;
    font-size: 0.98rem;
    position: relative;
}

.teaching-list li::marker {
    color: var(--accent-color);
}

.teaching-card p {
    color: var(--text-muted);
    font-size: 0.98rem;
    margin-bottom: 0;
    line-height: 1.7;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 18px;
}

.skill-tag {
    display: inline-block;
    background: linear-gradient(135deg, rgba(74, 144, 217, 0.1) 0%, rgba(45, 90, 135, 0.1) 100%);
    color: var(--primary-color);
    padding: 8px 18px;
    border-radius: 25px;
    font-size: 0.88rem;
    font-weight: 600;
    border: 1px solid rgba(74, 144, 217, 0.2);
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--accent-gradient);
    color: var(--bg-white);
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(74, 144, 217, 0.3);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-info {
    padding: 40px;
    background: var(--bg-white);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    height: 100%;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 28px;
}

.contact-item i {
    width: 55px;
    height: 55px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    margin-right: 18px;
    flex-shrink: 0;
    font-size: 1.2rem;
    box-shadow: 0 6px 18px rgba(74, 144, 217, 0.3);
    transition: var(--transition);
}

.contact-item:hover i {
    transform: scale(1.1) rotate(10deg);
}

.contact-item h5 {
    font-size: 1.05rem;
    color: var(--primary-color);
    margin-bottom: 6px;
    font-family: 'Open Sans', sans-serif;
    font-weight: 700;
}

.contact-item p,
.contact-item a {
    color: var(--text-muted);
    font-size: 0.98rem;
    margin-bottom: 0;
}

.academic-profiles h5 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 18px;
}

.profile-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.profile-link {
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    background: linear-gradient(135deg, rgba(74, 144, 217, 0.08) 0%, rgba(45, 90, 135, 0.08) 100%);
    border-radius: 10px;
    color: var(--text-muted);
    font-size: 0.92rem;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid rgba(74, 144, 217, 0.15);
}

.profile-link i {
    margin-right: 10px;
    color: var(--accent-color);
}

.profile-link:hover {
    background: var(--accent-gradient);
    color: var(--bg-white);
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(74, 144, 217, 0.3);
    border-color: transparent;
}

.profile-link:hover i {
    color: var(--bg-white);
}

.contact-form-wrapper {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.contact-form .form-control {
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 0.98rem;
    transition: var(--transition);
    background: var(--bg-light);
}

.contact-form .form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(74, 144, 217, 0.15);
    background: var(--bg-white);
}

.contact-form textarea.form-control {
    resize: vertical;
    min-height: 140px;
}

/* ============================================
   Footer
   ============================================ */
.footer-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: var(--bg-white);
    padding: 40px 0;
    position: relative;
}

.footer-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.95rem;
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    color: var(--bg-white);
    margin-left: 12px;
    transition: var(--transition);
    backdrop-filter: blur(5px);
}

.footer-social a:hover {
    background: var(--accent-color);
    transform: translateY(-4px) rotate(5deg);
    box-shadow: 0 6px 20px rgba(74, 144, 217, 0.4);
}

/* ============================================
   Responsive Styles
   ============================================ */
@media (max-width: 991.98px) {
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-subtitle {
        font-size: 1.4rem;
    }
    
    .hero-content {
        padding-left: 0;
        text-align: center;
        margin-top: 40px;
    }
    
    .hero-description {
        margin: 0 auto 30px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .profile-image {
        width: 250px;
        height: 250px;
    }
    
    .section-padding {
        padding: 80px 0;
    }
    
    .timeline {
        padding-left: 40px;
    }
    
    .timeline::before {
        left: 12px;
    }
    
    .timeline-marker {
        left: -35px;
    }
}

@media (max-width: 767.98px) {
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .profile-image {
        width: 200px;
        height: 200px;
    }
    
    .btn-primary-custom,
    .btn-outline-custom {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .research-card {
        flex-direction: column;
        text-align: center;
    }
    
    .research-icon {
        margin-bottom: 20px;
        margin-right: 0;
    }
    
    .publication-item {
        flex-direction: column;
        padding: 25px;
    }
    
    .publication-year {
        margin-bottom: 12px;
    }
    
    .contact-info {
        margin-bottom: 30px;
    }
    
    .section-padding {
        padding: 60px 0;
    }
}

@media (max-width: 575.98px) {
    .navbar-brand {
        font-size: 1.3rem;
    }
    
    .hero-title {
        font-size: 1.9rem;
    }
    
    .profile-image {
        width: 170px;
        height: 170px;
    }
    
    .info-card,
    .research-card,
    .teaching-card,
    .timeline-content,
    .contact-info,
    .contact-form-wrapper {
        padding: 25px;
    }
    
    .section-title {
        font-size: 1.7rem;
    }
}

/* ============================================
   Premium Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

.profile-image-wrapper {
    animation: fadeInLeft 1s ease-out 0.3s backwards;
}

/* Smooth scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-gradient);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}