:root {
        --brain-blue: #3b82f6;
        --brain-accent: #10b981;
    }

    body {
        font-family: 'Manrope', sans-serif;
        background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
        min-height: 100vh;
    }

    #particles-js {
        position: fixed;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        z-index: 1;
        pointer-events: none;
    }

    .node {
        position: absolute;
        width: 4px;
        height: 4px;
        background: rgba(59, 130, 246, 0.6);
        border-radius: 50%;
        animation: pulse 2s infinite alternate;
    }

    .connection {
        position: absolute;
        height: 1px;
        background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.3), transparent);
        transform-origin: left center;
        animation: flow 3s infinite;
    }

    @keyframes pulse {
        0% { opacity: 0.3; transform: scale(1); }
        100% { opacity: 0.8; transform: scale(1.2); }
    }

    @keyframes flow {
        0% { opacity: 0; }
        50% { opacity: 1; }
        100% { opacity: 0; }
    }

    .floating-shapes {
        overflow: hidden;
    }

    .shape {
        position: absolute;
        opacity: 0.08;
        animation: float 8s ease-in-out infinite;
    }

    .shape:nth-child(1) { top: 20%; left: 10%; animation-delay: 0s; }
    .shape:nth-child(2) { top: 60%; right: 15%; animation-delay: 2s; }
    .shape:nth-child(3) { bottom: 20%; left: 20%; animation-delay: 4s; }

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

    .section-reveal {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 1s ease-out, transform 1s ease-out;
    }

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

    .section-reveal:nth-child(1) { animation-delay: 0.1s; }
    .section-reveal:nth-child(2) { animation-delay: 0.2s; }
    .section-reveal:nth-child(3) { animation-delay: 0.3s; }
    .section-reveal:nth-child(4) { animation-delay: 0.4s; }

    .content-fade {
        opacity: 0;
        transform: translateY(20px);
        animation: fadeInUp 1s ease-out 0.5s forwards;
    }

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

    @keyframes slideUp {
        from { opacity: 0; transform: translateY(50px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .glass-card {
        background: linear-gradient(135deg,
            rgba(26, 115, 232, 0.08) 0%,
            rgba(30, 41, 59, 0.45) 35%,
            rgba(51, 65, 85, 0.35) 100%);
        backdrop-filter: blur(20px);
        border: 1px solid rgba(26, 115, 232, 0.15);
        transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        position: relative;
        overflow: hidden;
    }

    .glass-card:hover {
        transform: translateY(-12px) scale(1.02);
        background: linear-gradient(135deg,
            rgba(26, 115, 232, 0.15) 0%,
            rgba(30, 41, 59, 0.6) 35%,
            rgba(51, 65, 85, 0.45) 100%);
        border: 1px solid rgba(26, 115, 232, 0.3);
        box-shadow:
            0 25px 50px rgba(0, 0, 0, 0.4),
            0 0 30px rgba(26, 115, 232, 0.2),
            inset 0 1px 0 rgba(255, 255, 255, 0.1);
    }

    .glass-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg,
            transparent,
            rgba(26, 115, 232, 0.1),
            transparent);
        transition: left 0.6s ease;
    }

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

    .card-icon {
        transition: all 0.3s ease;
    }

    .glass-card:hover .card-icon {
        transform: scale(1.1);
        filter: drop-shadow(0 0 20px rgba(59, 130, 246, 0.5));
    }

    .section-dark::before {
        content: '';
        position: absolute;
        top: 0; left: 0; right: 0; bottom: 0;
        background:
            radial-gradient(circle at 20% 80%, rgba(26, 115, 232, 0.03) 0%, transparent 50%),
            radial-gradient(circle at 80% 20%, rgba(52, 168, 83, 0.03) 0%, transparent 50%);
    }

    .section-darker {
        background: linear-gradient(135deg,
            rgba(30, 41, 59, 0.9) 0%,
            rgba(51, 65, 85, 0.8) 50%,
            rgba(15, 23, 42, 0.9) 100%);
        position: relative;
    }

    .section-darker::before {
        content: '';
        position: absolute;
        top: 0; left: 0; right: 0; bottom: 0;
    }

    .animate-float {
        animation: float 3s ease-in-out infinite;
    }

    .profile-glow {
        filter: drop-shadow(0 10px 30px rgba(59, 130, 246, 0.3));
    }

    @keyframes glow {
        from { box-shadow: 0 0 10px rgba(26, 115, 232, 0.4); }
        to { box-shadow: 0 0 25px rgba(26, 115, 232, 0.7); }
    }

    .btn-primary {
        background: linear-gradient(135deg, #1a73e8 0%, #1565c0 100%);
        transition: all 0.3s ease;
        box-shadow: 0 4px 15px rgba(26, 115, 232, 0.3);
        overflow: hidden;
        position: relative;
    }

    .btn-primary::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
        transition: left 0.6s;
    }

    .btn-primary:hover::before {
        left: 100%;
    }

    .btn-primary:hover {
        filter: brightness(1.2);
        transform: translateY(-2px);
        box-shadow: 0 0 30px rgba(26, 115, 232, 0.5);
    }

    .btn-secondary {
        background: rgba(255, 255, 255, 0.1);
        border: 1px solid rgba(255, 255, 255, 0.2);
        transition: all 0.3s ease;
    }

    .btn-secondary:hover {
        background: rgba(255, 255, 255, 0.15);
        transform: translateY(-2px);
    }

    .nav-blur {
        background: rgba(15, 23, 42, 0.8);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .section-spacing {
        padding: 5rem 0;
    }

    .content-width {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1.5rem;
    }

    @media (max-width: 768px) {
        .section-spacing {
            padding: 3rem 0;
        }
    }