:root {
    --dark-bg: #121212;
    --dark-secondary: #1E1E1E;
    --dark-tertiary: #2C2C2C;
    --dark-text: #E0E0E0;
    --accent-color: #00FFD4;
    --accent-secondary: #FF6B6B;
    --hover-color: #00B4A6;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

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

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5%;
    padding-top: 80px;
    position: relative;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 150%;
    height: 150%;
    background: radial-gradient(circle at 30% 50%, rgba(0, 255, 212, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(255, 107, 107, 0.1) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

.hero-content {
    background: rgba(30, 30, 30, 0.6);
    backdrop-filter: blur(20px);
    padding: 3rem;
    border-radius: 30px;
    text-align: center;
    max-width: 900px;
    position: relative;
    border: 2px solid rgba(0, 255, 212, 0.2);
    z-index: 10;
    animation: fadeInUp 1s ease-out;
    margin: 3rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1 {
    font-size: clamp(3rem, 10vw, 5rem);
    background: linear-gradient(45deg, var(--accent-color), #00B4A6, var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    font-weight: 900;
    letter-spacing: 2px;
}

.tagline {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    font-weight: 300;
    font-style: italic;
}

.description {
    font-size: clamp(1rem, 2vw, 1.1rem);
    opacity: 0.9;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--dark-bg);
    box-shadow: 0 5px 20px rgba(0, 255, 212, 0.4);
}

.btn-primary:hover {
    background: var(--hover-color);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 255, 212, 0.6);
}

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

.btn-secondary:hover {
    background: var(--accent-color);
    color: var(--dark-bg);
    transform: translateY(-3px);
}

/* Floating Elements */
.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

.float-item {
    position: absolute;
    font-size: 3rem;
    color: var(--accent-color);
    opacity: 0.15;
    animation: float 6s ease-in-out infinite;
}

.float-item.atom {
    top: 15%;
    left: 10%;
    animation-delay: 0s;
}

.float-item.flask {
    top: 70%;
    left: 15%;
    animation-delay: 1.5s;
}

.float-item.microscope {
    top: 20%;
    right: 15%;
    animation-delay: 3s;
}

.float-item.rocket {
    bottom: 20%;
    right: 10%;
    animation-delay: 4.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

/* Event Stats */
.event-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    padding: 3rem 5%;
    background: var(--dark-secondary);
}

.stat-card {
    text-align: center;
    padding: 2rem 1rem;
    border-radius: 15px;
    background: var(--dark-tertiary);
    border: 1px solid rgba(0, 255, 212, 0.1);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(0, 255, 212, 0.2);
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.stat-card h3 {
    font-size: 1rem;
    color: var(--dark-text);
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.header-line {
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    margin: 0 auto;
}

/* About Section */
.about-section {
    padding: 5rem 5%;
    background: linear-gradient(to bottom, var(--dark-secondary), var(--dark-bg));
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
    opacity: 0.9;
}

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

.image-placeholder {
    width: 300px;
    height: 300px;
    background: var(--gradient-3);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 20px 60px rgba(0, 255, 212, 0.3);
    animation: rotate3d 10s linear infinite;
}

/* Categories Section */
.categories-section {
    padding: 5rem 5%;
    background: var(--dark-bg);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.category-card {
    background: var(--dark-secondary);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    border: 2px solid rgba(0, 255, 212, 0.1);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 255, 212, 0.1), transparent);
    transition: left 0.6s ease;
}

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

.category-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-color);
    box-shadow: 0 15px 40px rgba(0, 255, 212, 0.3);
}

.category-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.category-card h3 {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.category-card p {
    opacity: 0.8;
    line-height: 1.6;
}

/* Highlights Section */
.highlights-section {
    padding: 5rem 5%;
    background: var(--dark-secondary);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.highlight-card {
    background: var(--dark-tertiary);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    border: 1px solid rgba(0, 255, 212, 0.1);
    transition: all 0.3s ease;
}

.highlight-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-color);
}

.highlight-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.highlight-card h3 {
    font-size: 1.3rem;
    color: var(--accent-color);
    margin-bottom: 0.8rem;
}

/* Timeline Section */
.timeline-section {
    padding: 5rem 5%;
    background: var(--dark-bg);
}

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

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

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

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

.timeline-marker {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    border: 4px solid var(--dark-bg);
    z-index: 2;
}

.timeline-content {
    width: 45%;
    background: var(--dark-secondary);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid rgba(0, 255, 212, 0.2);
}

.timeline-item:nth-child(odd) .timeline-content {
    text-align: right;
}

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

.timeline-content p {
    opacity: 0.8;
}

/* Register Section */
.register-section {
    padding: 5rem 5%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    text-align: center;
}

.register-content h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    color: white;
    margin-bottom: 1.5rem;
}

.register-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

.register-btn {
    display: inline-block;
    padding: 1.2rem 3rem;
    background: white;
    color: #667eea;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.register-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
    background: var(--accent-color);
    color: var(--dark-bg);
}

/* Responsive Design */
@media screen and (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .image-placeholder {
        width: 250px;
        height: 250px;
        font-size: 6rem;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column !important;
        padding-left: 50px;
    }

    .timeline-marker {
        left: 20px;
    }

    .timeline-content {
        width: 100%;
        text-align: left !important;
    }
}

@media screen and (max-width: 768px) {
    .hero {
        min-height: calc(100vh - 80px);
    }

    .hero-content {
        padding: 2.5rem 1.5rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
        max-width: 300px;
    }

    .event-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .highlights-grid {
        grid-template-columns: 1fr;
    }

    .float-item {
        font-size: 2rem;
    }
}

@media screen and (max-width: 480px) {
    .hero-content {
        padding: 2rem 1rem;
    }

    .event-badge {
        font-size: 0.75rem;
        padding: 0.4rem 1rem;
    }

    .stat-card {
        padding: 1.5rem 1rem;
    }

    .stat-card i {
        font-size: 2rem;
    }

    .stat-card p {
        font-size: 1.5rem;
    }

    .category-card {
        padding: 2rem 1.5rem;
    }

    .category-icon {
        font-size: 2.5rem;
    }

    .image-placeholder {
        width: 200px;
        height: 200px;
        font-size: 4rem;
    }

    .timeline-content {
        padding: 1.5rem;
    }

    .register-content h2 {
        font-size: 1.8rem;
    }

    .register-content p {
        font-size: 1rem;
    }

    .register-btn {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}

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