/* Main variables and style reset */
:root {
    /* Color palette - Fusion Collaboration */
    --bg-primary: #F8F9FC;
    --bg-secondary: #F5F7FA;
    
    /* Primary colors */
    --primary-blue: #8e99c1;           /* Main blue-gray */
    --primary-blue-light: #a1b3d4;     /* Light blue-gray */
    --primary-blue-dark: #7a8bb3;      /* Dark blue-gray */
    
    /* Complementary colors */
    --accent-coral: #c18e7a;            /* Coral-orange */
    --accent-coral-light: #d4a18e;      /* Light coral */
    --accent-coral-dark: #b37a8b;       /* Dark coral */
    
    /* Neutral colors */
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --text-light: #FFFFFF;
    --text-muted: #8e9ba8;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #8e99c1 0%, #7a8bb3 100%);
    --gradient-accent: linear-gradient(135deg, #c18e7a 0%, #b37a8b 100%);
    --gradient-hero: linear-gradient(135deg, #8e99c1 0%, #c18e7a 100%);
    
    /* Shadows and effects */
    --shadow-light: 0 2px 10px rgba(142, 153, 193, 0.1);
    --shadow-medium: 0 4px 20px rgba(142, 153, 193, 0.15);
    --shadow-heavy: 0 8px 30px rgba(142, 153, 193, 0.2);
    --shadow-coral: 0 4px 20px rgba(193, 142, 122, 0.2);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    
    /* Animations */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(142, 153, 193, 0.2);
    z-index: 1000;
    transition: var(--transition-medium);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-logo i {
    color: var(--primary-blue);
    font-size: 1.8rem;
    animation: pulse 2s infinite;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a:hover {
    color: var(--accent-coral);
}

.nav-menu a::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-coral);
    transition: var(--transition-fast);
}

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

.nav-buttons {
    display: flex;
    gap: 15px;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-outline {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-medium);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    box-shadow: 0 6px 20px rgba(142, 153, 193, 0.3);
}

.btn-secondary {
    background: var(--accent-coral);
    color: var(--text-light);
}

.btn-secondary:hover {
    background: var(--accent-coral-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-coral);
}

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

.btn-outline:hover {
    background: var(--primary-blue);
    color: var(--text-light);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1rem;
}

/* Hero section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(142, 153, 193, 0.05) 100%);
    overflow: hidden;
}

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

.fusion-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(142, 153, 193, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(142, 153, 193, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: grid-move 20s linear infinite;
}

.plasma-orb {
    position: absolute;
    top: 20%;
    right: 10%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(193, 142, 122, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: plasma-glow 4s ease-in-out infinite alternate;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

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

.hero-text p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

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

.tokamak-schematic {
    position: relative;
    width: 300px;
    height: 300px;
}

.tokamak-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: rotate 10s linear infinite;
}

.plasma-flow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150px;
    height: 150px;
    border: 2px solid var(--accent-coral);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

.magnetic-field {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 250px;
    height: 250px;
    border: 1px dashed var(--primary-blue-light);
    border-radius: 50%;
    animation: rotate 15s linear infinite reverse;
}

/* Statistics */
.stats {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.stat-card {
    background: var(--text-light);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
    border: 1px solid rgba(142, 153, 193, 0.1);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--accent-coral-light);
}

.stat-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--text-light);
    font-size: 1.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

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

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Projects */
.projects {
    padding: 100px 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--text-light);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
    border: 1px solid rgba(142, 153, 193, 0.1);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--accent-coral-light);
}

.project-image {
    height: 200px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.project-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 2rem;
    backdrop-filter: blur(10px);
}

.project-content {
    padding: 30px;
}

.project-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

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

.project-category {
    background: var(--accent-coral-light);
    color: var(--accent-coral-dark);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-members {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Experts */
.experts {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.expert-card {
    background: var(--text-light);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
    border: 1px solid rgba(142, 153, 193, 0.1);
    display: flex;
    align-items: center;
    gap: 20px;
}

.expert-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--accent-coral-light);
}

.expert-avatar {
    flex-shrink: 0;
}

.avatar-placeholder {
    width: 80px;
    height: 80px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 2rem;
}

.expert-info h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.expert-title {
    color: var(--accent-coral);
    font-weight: 500;
    margin-bottom: 5px;
}

.expert-org {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.expert-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    background: var(--primary-blue-light);
    color: var(--primary-blue-dark);
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* About */
.about {
    padding: 100px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 30px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

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

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

.fusion-animation {
    position: relative;
    width: 300px;
    height: 300px;
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--primary-blue);
    border-radius: 50%;
    animation: particle-float 4s ease-in-out infinite;
}

.particle-1 {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.particle-2 {
    top: 60%;
    right: 30%;
    animation-delay: 1.3s;
    background: var(--accent-coral);
}

.particle-3 {
    bottom: 20%;
    left: 50%;
    animation-delay: 2.6s;
    background: var(--primary-blue-light);
}

/* CTA section */
.cta {
    padding: 100px 0;
    background: var(--gradient-hero);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-light);
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
.footer {
    background: var(--primary-blue-dark);
    color: var(--text-light);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-logo i {
    color: var(--accent-coral);
}

.footer-section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-light);
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--accent-coral);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: var(--accent-coral);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

@keyframes rotate {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

@keyframes plasma-glow {
    0% {
        opacity: 0.3;
        transform: scale(1);
    }
    100% {
        opacity: 0.6;
        transform: scale(1.1);
    }
}

@keyframes grid-move {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

@keyframes particle-float {
    0%, 100% {
        transform: translateY(0px);
        opacity: 0.7;
    }
    50% {
        transform: translateY(-20px);
        opacity: 1;
    }
}

/* Responsiveness */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .experts-grid {
        grid-template-columns: 1fr;
    }
    
    .expert-card {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
}