/* ==========================================================================
   Modern Academic Portfolio - Environmental Analytical Chemistry Theme
   ========================================================================== */

/* CSS Variables - Environmental Chemistry Theme */
:root {
    --primary-color: #1e40af;
    --secondary-color: #0ea5e9;
    --accent-color: #06b6d4;
    --water-blue: #0c4a6e;
    --ocean-deep: #0f172a;
    --sky-light: #e0f2fe;
    --molecular-green: #059669;
    --research-orange: #ea580c;
    --text-dark: #0f172a;
    --text-light: #64748b;
    --text-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --bg-gradient: linear-gradient(135deg, #0c4a6e 0%, #1e40af 50%, #0ea5e9 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --border-color: #e2e8f0;
    --shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.3);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Source Serif Pro', serif;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.7;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.brand-text {
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary-color);
    background: var(--sky-light);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-menu a:hover::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--bg-gradient);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.molecular-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.1) 2px, transparent 2px),
        radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.1) 2px, transparent 2px),
        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.1) 2px, transparent 2px);
    background-size: 100px 100px, 150px 150px, 200px 200px;
    animation: float 20s ease-in-out infinite;
}

.water-ripple {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(transparent, rgba(255, 255, 255, 0.1));
    border-radius: 50% 50% 0 0;
    animation: ripple 10s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

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

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-text {
    color: var(--text-white);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #e0f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.2rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-container {
    position: relative;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow-glow);
}

.profile-image {
    width: 350px;
    height: 350px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid rgba(255, 255, 255, 0.2);
}

.profile-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    padding: 2rem 1rem 1rem;
    text-align: center;
}

.research-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-white);
    font-size: 0.9rem;
    font-weight: 500;
}

.profile-name {
    font-family: 'Source Serif Pro', serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-white);
    text-align: center;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* Typing Animation */
.typing-animation {
    min-height: 60px;
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
}

.typing-text {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--accent-color);
    border-right: 2px solid var(--accent-color);
    white-space: nowrap;
    overflow: hidden;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { border-color: transparent; }
    51%, 100% { border-color: var(--accent-color); }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--text-white);
    box-shadow: var(--shadow-medium);
}

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

.btn-outline {
    background: transparent;
    color: var(--text-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--text-white);
    border: 2px solid var(--secondary-color);
    box-shadow: var(--shadow-medium);
}

.btn-secondary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

/* Section Styles */
.section {
    padding: 6rem 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Research Section */
.research-section {
    background: var(--bg-light);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.research-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

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

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.card-icon i {
    font-size: 1.5rem;
    color: var(--text-white);
}

.research-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.tag {
    background: var(--sky-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

/* SciTrace Project Section */
.scitrace-section {
    background: var(--bg-light);
}

.scitrace-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.scitrace-info h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.project-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent-color);
    color: var(--text-white);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.project-description {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.project-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.feature i {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-top: 0.2rem;
}

.feature h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.feature p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tech-tag {
    background: var(--sky-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.project-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.scitrace-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.project-mockup {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    border: 1px solid var(--border-color);
    overflow: hidden;
    width: 100%;
    max-width: 400px;
}

.mockup-header {
    background: var(--bg-gradient);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mockup-dots {
    display: flex;
    gap: 0.5rem;
}

.mockup-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.mockup-dots span:nth-child(1) {
    background: #ff5f57; /* Red - close button */
}

.mockup-dots span:nth-child(2) {
    background: #ffbd2e; /* Yellow - minimize button */
}

.mockup-dots span:nth-child(3) {
    background: #28ca42; /* Green - maximize button */
}

.mockup-title {
    color: var(--text-white);
    font-weight: 500;
    font-size: 0.9rem;
}

.mockup-content {
    padding: 2rem;
}

.data-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.flow-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
    min-width: 80px;
}

.flow-node i {
    color: var(--accent-color);
    font-size: 1.5rem;
}

.flow-node span {
    font-size: 0.8rem;
    color: var(--text-dark);
    font-weight: 500;
    text-align: center;
}

.flow-arrow {
    color: var(--accent-color);
    font-size: 1.5rem;
    font-weight: bold;
}

.lineage-trace {
    background: var(--bg-light);
    border-radius: var(--border-radius);
    padding: 1rem;
}

.trace-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.trace-time {
    color: var(--accent-color);
    font-weight: 500;
    font-size: 0.8rem;
    font-family: 'JetBrains Mono', monospace;
}

.trace-action {
    color: var(--text-dark);
    font-size: 0.9rem;
}

/* Publications Section */
.publications-section {
    background: var(--bg-white);
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.publication-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.publication-card.featured {
    border: 2px solid var(--accent-color);
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(14, 165, 233, 0.02) 100%);
}

.publication-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

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

.journal-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.journal-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    border-radius: var(--border-radius);
    background: var(--bg-light);
    padding: 0.5rem;
}

.journal-logo[src*=".svg"] {
    background: transparent;
    padding: 0;
}

.journal-logo-placeholder {
    width: 60px;
    height: 60px;
    border-radius: var(--border-radius);
    background: var(--bg-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-size: 1.5rem;
}

.journal-details h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.journal-name {
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
}

.publication-year {
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.publication-metrics {
    background: var(--sky-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.publication-abstract {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.publication-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.keyword {
    background: var(--bg-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.publication-links {
    margin-top: 1.5rem;
}

.publication-links .btn {
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
}

/* Conferences Section */
.conferences-section {
    margin-top: 4rem;
}

.subsection-title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.conferences-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
}

.conference-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.conference-card:hover {
    box-shadow: var(--shadow-light);
}

.conference-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
    gap: 1rem;
}

.conference-header h4 {
    font-size: 1rem;
    color: var(--primary-color);
    flex: 1;
}

.conference-date {
    background: var(--accent-color);
    color: var(--text-white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
}

.conference-venue {
    color: var(--text-dark);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.conference-location {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Experience Timeline */
.experience-section {
    background: var(--bg-light);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--bg-gradient);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 80px;
}

.timeline-marker {
    position: absolute;
    left: 15px;
    top: 0;
    width: 30px;
    height: 30px;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--bg-white);
    box-shadow: var(--shadow-light);
}

.timeline-marker i {
    color: var(--text-white);
    font-size: 0.8rem;
}

.timeline-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

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

.timeline-header h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.timeline-date {
    background: var(--sky-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
}

.timeline-content h4 {
    color: var(--text-dark);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.timeline-highlights {
    margin: 1rem 0;
}

.highlight {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.highlight i {
    color: var(--molecular-green);
    font-size: 0.8rem;
}

.timeline-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.skill-tag {
    background: var(--sky-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

/* Contact Section */
.contact-section {
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-medium);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    color: var(--text-white);
    font-size: 1.2rem;
}

.contact-details h3 {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

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

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

.social-link {
    width: 50px;
    height: 50px;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.contact-form-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--bg-white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

/* Footer */
.footer {
    background: var(--ocean-deep);
    color: var(--text-white);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
}

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

.footer-links a {
    color: var(--text-white);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .profile-image {
        width: 250px;
        height: 250px;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .publications-grid {
        grid-template-columns: 1fr;
    }
    
    .conferences-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .timeline-marker {
        left: 5px;
        width: 25px;
        height: 25px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .research-card,
    .publication-card {
        padding: 1.5rem;
    }
    
    .profile-image {
        width: 200px;
        height: 200px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Print styles */
@media print {
    .navbar,
    .hero-actions,
    .contact-form-container {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
}