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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #e0e0e0;
    background: #000814;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Video Background */
.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
}

#bg-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(0, 8, 20, 0.7) 0%,
        rgba(0, 8, 20, 0.85) 50%,
        rgba(0, 8, 20, 0.9) 100%
    );
    z-index: -1;
}

/* Header */
header {
    padding: 2rem 5%;
    background: rgba(0, 8, 20, 0.6);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(100, 200, 255, 0.2);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo h1 {
    font-size: 2rem;
    color: #64c8ff;
    font-weight: 300;
    letter-spacing: 2px;
}

/* Main Content */
.home-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 5%;
    min-height: calc(100vh - 200px);
}

.hero-section {
    text-align: center;
    padding: 4rem 0 6rem 0;
    animation: fadeIn 1.5s ease-in;
}

.main-title {
    font-size: 4rem;
    font-weight: 300;
    color: #64c8ff;
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(100, 200, 255, 0.3);
}

.subtitle {
    font-size: 1.3rem;
    color: #a0d8f1;
    font-weight: 300;
    letter-spacing: 1px;
}

/* Interest Cards Grid */
.interest-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.interest-card {
    background: rgba(15, 30, 50, 0.7);
    border: 1px solid rgba(100, 200, 255, 0.3);
    border-radius: 15px;
    padding: 2.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.interest-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

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

.interest-card:hover {
    transform: translateY(-10px);
    border-color: rgba(100, 200, 255, 0.6);
    box-shadow: 0 10px 40px rgba(100, 200, 255, 0.2);
}

.interest-card.placeholder {
    opacity: 0.5;
}

.card-content {
    position: relative;
    z-index: 1;
}

.card-title {
    font-size: 1.8rem;
    color: #64c8ff;
    margin-bottom: 1rem;
    font-weight: 400;
}

.card-description {
    color: #b0d8f0;
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.card-link {
    display: inline-block;
    color: #64c8ff;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.card-link:hover {
    color: #8dd6ff;
    border-bottom: 2px solid #64c8ff;
    transform: translateX(5px);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: rgba(0, 8, 20, 0.8);
    border-top: 1px solid rgba(100, 200, 255, 0.2);
    color: #7a9eb8;
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .interest-grid {
        grid-template-columns: 1fr;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
}