/* Modern CSS Reset and Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #007F73;
    --primary-light: #00a693;
    --primary-dark: #005a52;
    --secondary-color: #d5fdf9;
    --accent-color: #ff6b6b;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fffe;
    --bg-tertiary: #f0f9f8;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    --gradient-secondary: linear-gradient(135deg, var(--secondary-color), var(--bg-primary));
    --gradient-accent: linear-gradient(135deg, var(--accent-color), #ff8e8e);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 127, 115, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 127, 115, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 127, 115, 0.16);
    --shadow-xl: 0 16px 48px rgba(0, 127, 115, 0.20);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* Dark theme variables */
[data-theme="dark"] {
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-light: #999999;
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    text-align: center;
    color: white;
}

.loader-circle {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

.loader-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
    letter-spacing: 0.1em;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--gradient-primary);
    z-index: var(--z-fixed);
    transition: width 0.1s ease;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 127, 115, 0.1);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo-container {
    position: relative;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: all var(--transition-base);
}
a.logo {
  text-decoration: none;
}

.logo-underline {
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.logo:hover .logo-underline {
    width: 100%;
}

.navbar {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link i {
    font-size: var(--font-size-lg);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: rgba(0, 127, 115, 0.08);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.theme-toggle {
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(0, 127, 115, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    background: rgba(0, 127, 115, 0.2);
    transform: scale(1.05);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    transition: all var(--transition-base);
    transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Section Base Styles */
.section {
    padding: var(--space-24) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

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

/* Home Section */
.home {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.home-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.home-content {
    z-index: 2;
}

.greeting-container {
    margin-bottom: var(--space-8);
}

.greeting {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--space-2);
    display: block;
}

.main-name {
    font-size: var(--font-size-6xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-4);
    position: relative;
}

.name-highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.profession {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-8);
}

.multiple-text {
    color: var(--primary-color);
    font-weight: 700;
}

.bio-text {
    font-size: var(--font-size-lg);
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    max-width: 90%;
}

.social-media {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
}

.social-link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 127, 115, 0.1);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    color: var(--primary-color);
    text-decoration: none;
    font-size: var(--font-size-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    opacity: 0;
    transition: all var(--transition-base);
    pointer-events: none;
}

.social-link:hover::before {
    opacity: 1;
    bottom: -35px;
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.social-icon {
    width: 24px;
    height: 24px;
    filter: brightness(0) saturate(100%) invert(27%) sepia(51%) saturate(2878%) hue-rotate(162deg) brightness(97%) contrast(101%);
    transition: filter var(--transition-base);
}

.social-link:hover .social-icon {
    filter: brightness(0) saturate(100%) invert(100%);
}

.cta-buttons {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    min-width: 160px;
    justify-content: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-icon {
    font-size: var(--font-size-lg);
    transition: transform var(--transition-base);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

.btn-ripple {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.6s ease;
}

.btn:active .btn-ripple {
    width: 300px;
    height: 300px;
}

.home-image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.image-container {
    position: relative;
    width: 400px;
    height: 400px;
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-slow);
    position: relative;
    z-index: 2;
}

.image-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120%;
    height: 120%;
    background: var(--gradient-primary);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.2;
    filter: blur(30px);
    animation: pulse 3s ease-in-out infinite;
    z-index: 1;
}

.image-border {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border: 3px solid transparent;
    border-radius: 50%;
    background: var(--gradient-primary);
    background-clip: padding-box;
    z-index: 0;
}

.image-container:hover .profile-image {
    transform: scale(1.05);
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.2; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.3; }
}

.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.floating-element {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    opacity: 0.1;
    animation: float var(--duration, 6s) ease-in-out infinite;
    animation-delay: var(--delay, 0s);
}

.floating-element:nth-child(1) {
    top: 20%;
    left: 10%;
}

.floating-element:nth-child(2) {
    top: 60%;
    right: 15%;
}

.floating-element:nth-child(3) {
    bottom: 30%;
    left: 20%;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(120deg); }
    66% { transform: translateY(10px) rotate(240deg); }
}

/* About Section */
.about {
    background: var(--bg-secondary);
}

.about-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
    align-items: start;
}

.about-image {
    position: relative;
}

.image-wrapper {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.image-wrapper:hover .about-img {
    transform: scale(1.05);
}

.image-wrapper:hover .image-overlay {
    opacity: 0.1;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.about-text {
    margin-bottom: var(--space-6);
}

.about-heading {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--space-4);
}

.about-description {
    font-size: var(--font-size-lg);
    line-height: 1.7;
    color: var(--text-secondary);
}

.info-grid {
    display: grid;
    gap: var(--space-6);
}

.info-card {
    background: var(--bg-primary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 127, 115, 0.1);
    transition: all var(--transition-base);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.info-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-4);
}

.info-content h4 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.education-item,
.experience-item {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid rgba(0, 127, 115, 0.1);
}

.education-item:last-child,
.experience-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.year {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary-color);
    background: rgba(0, 127, 115, 0.1);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    white-space: nowrap;
    height: fit-content;
}

.details h5 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.details p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.research-highlights {
    background: var(--bg-primary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 127, 115, 0.1);
}

.research-highlights h4 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag {
    background: var(--gradient-primary);
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

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

.publications-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.pub-card {
    background: var(--bg-primary);
    border: 1px solid rgba(0, 127, 115, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.pub-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 127, 115, 0.05), transparent);
    transition: left 0.6s ease;
}

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

.pub-card:hover::before {
    left: 100%;
}

.pub-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
}

.pub-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
}

.pub-meta {
    text-align: right;
}

.pub-year {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
}

.pub-type {
    font-size: var(--font-size-sm);
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pub-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: var(--space-3);
}

.pub-journal {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.pub-description {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.pub-actions {
    display: flex;
    justify-content: flex-end;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
}

.pub-link:hover {
    color: var(--primary-dark);
    transform: translateX(4px);
}

/* Conferences Section */
.conferences {
    background: var(--bg-secondary);
}

.conferences-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.conference-image {
    position: relative;
}

.conference-image .image-wrapper {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
}

.conference-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.conference-image .image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 127, 115, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.overlay-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: white;
    text-align: center;
}

.overlay-content i {
    font-size: var(--font-size-5xl);
}

.overlay-content span {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.conference-image:hover img {
    transform: scale(1.1);
}

.conference-image:hover .image-overlay {
    opacity: 1;
}

.conference-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.timeline-item {
    display: flex;
    gap: var(--space-4);
    position: relative;
}

.timeline-item:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 25px;
    top: 60px;
    width: 2px;
    height: calc(100% + var(--space-8));
    background: linear-gradient(to bottom, var(--primary-color), transparent);
}

.timeline-marker {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.timeline-content {
    background: var(--bg-primary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 127, 115, 0.1);
    flex: 1;
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-3);
}

.timeline-content h4 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.timeline-date {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
    background: rgba(0, 127, 115, 0.1);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
}

.timeline-content h5 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--space-2);
}

.timeline-content p {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.timeline-tags .tag {
    background: rgba(0, 127, 115, 0.1);
    color: var(--primary-color);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

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

.contact-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.contact-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    background: var(--bg-secondary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.contact-details p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.5;
}

.contact-social {
    background: var(--bg-secondary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.contact-social h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.contact-social .social-links {
    display: flex;
    gap: var(--space-3);
}

.contact-social .social-link {
    width: 45px;
    height: 45px;
}

/* Contact Form */
.contact-form {
    background: var(--bg-secondary);
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
}

.form-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.input-group {
    position: relative;
}

.input-group.full-width {
    grid-column: 1 / -1;
}

.form-input {
    width: 100%;
    padding: var(--space-4) var(--space-4) var(--space-4) 0;
    border: none;
    border-bottom: 2px solid rgba(0, 127, 115, 0.2);
    background: transparent;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    transition: all var(--transition-base);
    outline: none;
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
    padding-top: var(--space-6);
}

.form-label {
    position: absolute;
    left: 0;
    top: var(--space-4);
    color: var(--text-light);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    pointer-events: none;
}

.form-input:focus + .form-label,
.form-input:not(:placeholder-shown) + .form-label {
    top: 0;
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
}

.form-input:focus {
    border-bottom-color: var(--primary-color);
}

.input-border {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.form-input:focus ~ .input-border {
    width: 100%;
}

.form-submit {
    width: 100%;
    margin-top: var(--space-4);
    padding: var(--space-5) var(--space-6);
    font-size: var(--font-size-lg);
}

/* Footer */
.footer {
    background: var(--gradient-primary);
    color: white;
    padding: var(--space-16) 0 var(--space-8);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-info h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.footer-info p {
    font-size: var(--font-size-base);
    opacity: 0.9;
    line-height: 1.6;
    margin-bottom: var(--space-2);
}

.footer-links h4,
.footer-social h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-2);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: white;
}

.footer-social .social-links {
    display: flex;
    gap: var(--space-3);
}

.footer-social .social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-social .social-link:hover {
    background: white;
    color: var(--primary-color);
}

.footer-social .social-icon {
    filter: brightness(0) saturate(100%) invert(100%);
}

.footer-social .social-link:hover .social-icon {
    filter: brightness(0) saturate(100%) invert(27%) sepia(51%) saturate(2878%) hue-rotate(162deg) brightness(97%) contrast(101%);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    opacity: 0.8;
    margin-bottom: var(--space-2);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: var(--font-size-xl);
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    opacity: 0;
    visibility: hidden;
    z-index: var(--z-fixed);
}

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

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 0.8s ease-out;
}

.animate-fade-in-delay {
    animation: fadeIn 0.8s ease-out 0.2s both;
}

.animate-fade-in-delay-2 {
    animation: fadeIn 0.8s ease-out 0.4s both;
}

.animate-slide-up {
    animation: slideUp 0.8s ease-out 0.3s both;
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Error Styles */
.error-message {
    color: var(--accent-color);
    font-size: var(--font-size-sm);
    margin-top: var(--space-1);
    display: block;
}

.form-input.error {
    border-bottom-color: var(--accent-color);
}

.form-input.error + .form-label {
    color: var(--accent-color);
}

/* Success Styles */
.success-message {
    background: #d4edda;
    color: #155724;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    border: 1px solid #c3e6cb;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .home-container,
    .about-container,
    .conferences-container,
    .contact-container {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }
    
    .main-name {
        font-size: var(--font-size-5xl);
    }
    
    .section-title {
        font-size: var(--font-size-4xl);
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .navbar {
        position: fixed;
        top: 80px;
        right: -100%;
        width: 280px;
        height: calc(100vh - 80px);
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-6);
        gap: var(--space-4);
        transition: right var(--transition-base);
        box-shadow: var(--shadow-lg);
        border-left: 1px solid rgba(0, 127, 115, 0.1);
    }
    
    .navbar.active {
        right: 0;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--space-4);
        border-radius: var(--radius-lg);
        justify-content: flex-start;
    }
    
    .home {
        padding-top: 100px;
    }
    
    .home-container {
        text-align: center;
    }
    
    .home-image {
        order: -1;
    }
    
    .image-container {
        width: 300px;
        height: 300px;
    }
    
    .main-name {
        font-size: var(--font-size-4xl);
    }
    
    .profession {
        font-size: var(--font-size-xl);
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .form-group {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .publications-container {
        grid-template-columns: 1fr;
    }
    
    .timeline-item {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .timeline-item::after {
        display: none;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: var(--space-2);
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--space-16) 0;
    }
    
    .header-container,
    .home-container,
    .about-container,
    .publications-container,
    .conferences-container,
    .contact-container,
    .footer-container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
    
    .main-name {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .greeting {
        font-size: var(--font-size-lg);
    }
    
    .profession {
        font-size: var(--font-size-lg);
    }
    
    .bio-text {
        font-size: var(--font-size-base);
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .image-container {
        width: 250px;
        height: 250px;
    }
    
    .contact-form {
        padding: var(--space-6);
    }
}

/* Print Styles */
@media print {
    .header,
    .floating-elements,
    .back-to-top,
    .contact,
    .footer {
        display: none;
    }
    
    .section {
        padding: var(--space-8) 0;
        page-break-inside: avoid;
    }
    
    .pub-card,
    .timeline-item {
        page-break-inside: avoid;
        margin-bottom: var(--space-6);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
        --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    }
    
    .btn,
    .social-link,
    .pub-card,
    .contact-card,
    .timeline-content {
        border: 2px solid var(--text-primary);
    }
}