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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #64748b;
    background-color: #ffffff;
}

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

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
}

.floating-shapes {
    position: relative;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    bottom: 30%;
    left: 20%;
    animation-delay: 4s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    top: 10%;
    right: 30%;
    animation-delay: 1s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-content {
    text-align: center;
    z-index: 2;
    color: white;
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.3s both;
}

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

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e2e8f0;
    z-index: 1000;
    transition: all 0.3s ease;
}

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

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

.nav-link {
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #2563eb;
    background-color: #f1f5f9;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: #64748b;
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Content */
.main-content {
    padding-top: 2rem;
}

.section {
    padding: 4rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section:nth-child(even) {
    background-color: #f8fafc;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    color: #1e40af;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    width: 60px;
    height: 3px;
    background: #f59e0b;
    transform: translateX(-50%);
}

.content-card {
    background: white;
    border-radius: 1rem;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.content-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.1);
}

.lead-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: #1e40af;
    margin-bottom: 2rem;
    line-height: 1.7;
}

/* Highlight Grid */
.highlight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.highlight-item {
    text-align: center;
    padding: 2rem;
    border-radius: 1rem;
    background: linear-gradient(135deg, #dbeafe 0%, #f0f9ff 100%);
    transition: all 0.3s ease;
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -3px rgba(37, 99, 235, 0.1);
}

.highlight-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.highlight-item h3 {
    color: #1e40af;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* Regulatory Overview */
.regulatory-overview {
    margin-top: 3rem;
    padding: 2rem;
    background: #f8fafc;
    border-radius: 1rem;
    border-left: 4px solid #f59e0b;
}

.regulatory-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.regulatory-item {
    padding: 1rem;
    background: white;
    border-radius: 0.5rem;
    border-left: 3px solid #2563eb;
}

/* Characteristics Grid */
.characteristics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.characteristic {
    text-align: center;
    padding: 1.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.characteristic:hover {
    border-color: #2563eb;
    transform: translateY(-3px);
}

.char-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.characteristic h4 {
    color: #1e40af;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Comparison Table */
.comparison-table {
    margin: 2rem 0;
}

.comparison-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    padding: 1rem;
    border-bottom: 1px solid #e2e8f0;
    align-items: center;
}

.comparison-label {
    font-weight: 600;
    color: #1e40af;
    font-family: 'JetBrains Mono', monospace;
}

/* Examples Section */
.examples-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #f1f5f9;
    border-radius: 0.5rem;
}

.examples-list {
    list-style: none;
    margin-top: 1rem;
}

.examples-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #e2e8f0;
}

.examples-list li:last-child {
    border-bottom: none;
}

.example-type {
    font-weight: 600;
    color: #2563eb;
    font-family: 'JetBrains Mono', monospace;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.category-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #2563eb, #f59e0b);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.category-card h3 {
    color: #1e40af;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.category-details {
    margin-top: 1rem;
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.category-card:hover .category-details {
    opacity: 1;
    max-height: 200px;
}

.category-details ul {
    list-style: none;
    padding-left: 0;
}

.category-details li {
    padding: 0.25rem 0;
    color: #64748b;
    position: relative;
    padding-left: 1rem;
}

.category-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: #f59e0b;
    font-weight: bold;
}

/* Research Timeline */
.research-timeline {
    position: relative;
    margin: 3rem 0;
}

.research-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #2563eb;
}

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

.timeline-marker {
    position: absolute;
    left: 20px;
    top: 0;
    width: 20px;
    height: 20px;
    background: #f59e0b;
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 0 0 2px #2563eb;
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.timeline-content h4 {
    color: #1e40af;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* Techniques Grid */
.techniques-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.technique {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 0.5rem;
    border-left: 3px solid #f59e0b;
}

.technique code {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    color: #2563eb;
    margin-bottom: 0.5rem;
}

.technique span {
    font-size: 0.875rem;
    color: #64748b;
}

/* Conferences Grid */
.conferences-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.conference-item {
    padding: 1.5rem;
    background: #f1f5f9;
    border-radius: 1rem;
    border-left: 4px solid #2563eb;
}

.conference-item h4 {
    color: #1e40af;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* Research Focus */
.research-focus {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #dbeafe 0%, #f0f9ff 100%);
    border-radius: 1rem;
}

.research-focus h4 {
    color: #1e40af;
    font-weight: 600;
    margin-bottom: 1rem;
}

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

.priority-tag {
    background: #2563eb;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.footer-content h3 {
    color: #f59e0b;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.citation {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.footer-note {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .content-card {
        padding: 1.5rem;
    }
    
    .highlight-grid {
        grid-template-columns: 1fr;
    }
    
    .characteristics-grid {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .research-timeline::before {
        left: 20px;
    }
    
    .timeline-marker {
        left: 10px;
    }
    
    .techniques-grid {
        grid-template-columns: 1fr;
    }
    
    .conferences-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section {
        padding: 2rem 0;
    }
    
    .content-card {
        padding: 1rem;
    }
    
    .highlight-item {
        padding: 1.5rem;
    }
    
    .category-card {
        padding: 1.5rem;
    }
}