:root {
    --navy-deep: #0A1929;
    --navy-medium: #1A2B3F;
    --navy-light: #2A3B4F;
    --accent-blue: #3B82F6;
    --accent-glow: #60A5FA;
    --electric: #2563EB;
    --text-light: #F0F4FA;
    --text-dim: #B0C4DE;
    --glass-white: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.05);
    --card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--navy-deep) 0%, var(--navy-medium) 100%);
    color: var(--text-light);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(37, 99, 235, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Modern Navbar with Glass Effect */
.navbar {
    background: rgba(10, 25, 41, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0.75rem 0;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, var(--accent-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    position: relative;
}

.logo::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 40%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), transparent);
    border-radius: 2px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-glow));
    transition: width 0.3s ease;
}

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

.nav-links a:hover::before {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 150%;
    height: 150%;
    background: 
        repeating-linear-gradient(45deg, 
            transparent 0px, 
            transparent 10px, 
            rgba(59, 130, 246, 0.02) 10px, 
            rgba(59, 130, 246, 0.02) 20px);
    animation: backgroundShift 20s linear infinite;
    opacity: 0.5;
}

@keyframes backgroundShift {
    0% { transform: translate(-10%, -10%) rotate(0deg); }
    100% { transform: translate(10%, 10%) rotate(10deg); }
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 2;
    padding: 4rem 2rem;
}

.hero-badge {
    display: inline-block;
    background: var(--glass-white);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--accent-glow);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease;
}

.hero h1 {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 0%, var(--accent-glow) 50%, #fff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-dim);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-date {
    font-size: 1.25rem;
    color: var(--accent-glow);
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.8s both;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--electric));
    color: white;
    box-shadow: 0 10px 30px -10px var(--accent-blue);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px -10px var(--accent-blue);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--glass-border);
    color: white;
    backdrop-filter: blur(8px);
}

.btn-outline:hover {
    border-color: var(--accent-blue);
    background: var(--glass-white);
    transform: translateY(-2px);
}

/* Countdown Timer */
.countdown {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin: 4rem 0;
    animation: fadeInUp 0.8s ease 1s both;
}

.countdown-item {
    background: var(--glass-white);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 20px;
    min-width: 120px;
}

.countdown-value {
    font-size: 3rem;
    font-weight: 700;
    color: white;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.countdown-label {
    color: var(--text-dim);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Featured Cards */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(135deg, #fff 0%, var(--accent-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.card {
    background: var(--glass-white);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(59, 130, 246, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-blue);
    box-shadow: var(--card-shadow);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
}

.card p {
    color: var(--text-dim);
    margin-bottom: 1.5rem;
}

.card-link {
    color: var(--accent-glow);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.card-link:hover {
    gap: 1rem;
}

/* Speakers Section */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem;
}

.speaker-card {
    background: var(--glass-white);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.speaker-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    border: 3px solid var(--accent-blue);
    padding: 3px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-glow));
}

.speaker-image img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--navy-deep);
}

.speaker-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: white;
    margin-bottom: 0.5rem;
}

.speaker-affiliation {
    color: var(--accent-glow);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.speaker-topic {
    color: var(--text-dim);
    font-size: 0.95rem;
    font-style: italic;
}

/* Page Content */
.page {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 3rem;
    background: var(--glass-white);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    box-shadow: var(--card-shadow);
}

.page h1 {
    font-size: 3rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #fff 0%, var(--accent-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Timeline for Dates */
.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, var(--accent-blue), transparent);
}

.timeline-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2rem 0;
    position: relative;
}

.timeline-date {
    width: 45%;
    text-align: right;
    padding-right: 2rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-glow);
}

.timeline-content {
    width: 45%;
    padding-left: 2rem;
    color: white;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-blue);
    box-shadow: 0 0 20px var(--accent-blue);
}

/* Footer */
footer {
    background: rgba(10, 25, 41, 0.95);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    padding: 4rem 2rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h3 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.footer-section p, .footer-section a {
    color: var(--text-dim);
    text-decoration: none;
    line-height: 2;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--accent-glow);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--glass-white);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--accent-blue);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 3rem;
    margin-top: 3rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-dim);
}

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

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

/* Responsive Design */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 4rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(10, 25, 41, 0.95);
        backdrop-filter: blur(12px);
        padding: 2rem;
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .countdown {
        flex-wrap: wrap;
    }
    
    .page {
        padding: 2rem;
        margin: 2rem 1rem;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
        margin-left: 40px;
    }
    
    .timeline-date, .timeline-content {
        width: 100%;
        text-align: left;
        padding: 0.5rem 0;
    }
    
    .timeline-dot {
        left: 20px;
    }
}