/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    /* Colors */
    --primary-color: #2c3e50;
    --primary-dark: #1a252f;
    --accent-color: #e74c3c;
    --accent-light: #ff6b6b;
    --gold: #f39c12;
    --gold-light: #f1c40f;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-gold: linear-gradient(135deg, #f39c12 0%, #f1c40f 100%);
    --gradient-dark: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    
    /* Neutrals */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --gray: #95a5a6;
    --dark-gray: #34495e;
    --black: #2c3e50;
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

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

body {
    font-family: var(--font-body);
    line-height: 1.7;
    color: var(--black);
    background-color: var(--white);
    overflow-x: hidden;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
    margin-bottom: var(--spacing-sm);
}

.lead-text {
    font-size: 1.25rem;
    font-weight: 500;
    line-height: 1.8;
    color: var(--dark-gray);
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    text-decoration: none;
    color: var(--black);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: #667eea;
}

.nav-link:hover::after {
    width: 100%;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--black);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    opacity: 0.1;
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s infinite ease-in-out;
}

.hero-background::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(240, 147, 251, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 15s infinite ease-in-out reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 50px) scale(1.1); }
}

.hero-content {
    text-align: center;
    z-index: 1;
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.title-line {
    display: block;
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.title-subtitle {
    display: block;
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    font-weight: 400;
    color: var(--dark-gray);
    margin-top: var(--spacing-sm);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--gray);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

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

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

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

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

.btn-secondary {
    background: var(--white);
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: var(--white);
    transform: translateY(-2px);
}

/* ===================================
   Scroll Indicator
   =================================== */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

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

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--dark-gray);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 10px;
    background: var(--dark-gray);
    border-radius: 2px;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 1; top: 10px; }
    100% { opacity: 0; top: 30px; }
}

/* ===================================
   Section Headers
   =================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.title-underline {
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 0 auto;
    border-radius: 2px;
}

.subsection-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    color: var(--primary-color);
}

/* ===================================
   Welcome Section
   =================================== */
.welcome-section {
    background: var(--light-gray);
}

.welcome-content {
    max-width: 1000px;
    margin: 0 auto;
}

.welcome-intro-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.welcome-text {
    text-align: left;
}

.welcome-photo {
    display: flex;
    justify-content: center;
    align-items: center;
}

.welcome-photo img {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-base);
    object-fit: cover;
}

.welcome-photo img:hover {
    transform: scale(1.05);
    box-shadow: 0 20px 60px rgba(102, 126, 234, 0.3);
}


.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

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

.stat-number {
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: 1rem;
    color: var(--gray);
    font-weight: 500;
}

/* ===================================
   About Section
   =================================== */
.about-section {
    background: var(--white);
}

.about-intro {
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-md) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-marker {
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    box-shadow: 0 0 0 4px var(--white), 0 0 0 6px #667eea;
}

.timeline-content {
    width: calc(50% - 40px);
    background: var(--light-gray);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: auto;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
}

.timeline-content:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.timeline-content h3 {
    color: #667eea;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

/* Publications Grid */
.publications {
    margin-top: var(--spacing-xl);
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.publication-card {
    background: var(--white);
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.publication-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-gold);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.publication-card:hover {
    border-color: var(--gold);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.publication-year {
    display: inline-block;
    background: var(--gradient-gold);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.publication-card h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.publication-card p {
    color: var(--gray);
    font-size: 0.95rem;
    margin: 0;
}

/* Awards */
.awards {
    margin-top: var(--spacing-xl);
    background: var(--light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
}

.awards-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.award-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.award-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.award-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.award-text {
    flex: 1;
}

.award-text strong {
    color: var(--gold);
    display: block;
    margin-bottom: 0.25rem;
}

/* Associations */
.associations {
    margin-top: var(--spacing-xl);
}

.associations-list {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
}

.associations-list li {
    padding-left: var(--spacing-md);
    position: relative;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) var(--spacing-lg);
    background: var(--light-gray);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.associations-list li::before {
    content: '✓';
    position: absolute;
    left: var(--spacing-sm);
    color: #667eea;
    font-weight: 700;
    font-size: 1.2rem;
}

.associations-list li:hover {
    background: #667eea;
    color: var(--white);
    transform: translateX(8px);
}

.associations-list li:hover::before {
    color: var(--white);
}

/* ===================================
   Media Section
   =================================== */
.media-section {
    background: var(--light-gray);
}

.collaboration-intro {
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
}

.media-highlights {
    margin-top: var(--spacing-xl);
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.media-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-align: center;
}

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

.media-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.media-card h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.media-card ul {
    list-style: none;
    text-align: left;
}

.media-card li {
    padding: var(--spacing-xs) 0;
    color: var(--dark-gray);
    position: relative;
    padding-left: var(--spacing-md);
}

.media-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: 700;
}

/* Achievements */
.achievements {
    margin-top: var(--spacing-xl);
}

.achievements-list {
    display: grid;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.achievement-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.achievement-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.achievement-bullet {
    color: #667eea;
    font-weight: 700;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.achievement-item p {
    margin: 0;
    color: var(--dark-gray);
}

/* Contact CTA */
.contact-cta {
    margin-top: var(--spacing-xl);
    text-align: center;
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.contact-cta h3 {
    color: var(--white);
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.contact-cta p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.contact-cta .btn {
    background: var(--white);
    color: #667eea;
}

.contact-cta .btn:hover {
    background: var(--light-gray);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--gradient-dark);
    color: var(--white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-info h3 {
    color: var(--white);
    margin-bottom: var(--spacing-xs);
}

.footer-info p {
    opacity: 0.8;
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.6;
    margin: 0;
    font-size: 0.9rem;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 968px) {
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        flex-direction: row !important;
    }
    
    .timeline-marker {
        left: 20px;
        transform: translateX(-50%);
    }
    
    .timeline-content {
        width: calc(100% - 60px);
        margin-left: 60px !important;
    }
}

@media (max-width: 768px) {
    section {
        padding: var(--spacing-lg) 0;
    }
    
    .welcome-intro-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .welcome-text {
        text-align: center;
    }
    
    .welcome-photo img {
        max-width: 280px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 100%;
        max-width: 300px;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: right var(--transition-base);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .publications-grid {
        grid-template-columns: 1fr;
    }
    
    .media-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Animations & Utilities
   =================================== */
.fade-in {
    animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-up {
    animation: slideUp 0.6s ease;
}

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

/* ===================================
   Media Scans
   =================================== */
.media-scans {
    margin-top: var(--spacing-xl);
}

.scans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.scan-item {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    background: var(--white);
    padding: var(--spacing-xs);
    border: 1px solid var(--light-gray);
}

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

.scan-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
    transition: transform var(--transition-base);
}

.scan-item:hover img {
    transform: scale(1.02);
}

@media (max-width: 480px) {
    .scans-grid {
        grid-template-columns: 1fr;
    }
}