:root {
    --brain-bg: #f8f9fa;
    --brain-text: #212529;
    --brain-primary: #6f42c1;
    --brain-secondary: #20c997;
    --brain-accent: #fd7e14;
    --brain-card: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--brain-bg); color: var(--brain-text);
    font-family: 'Inter', system-ui, sans-serif;
    line-height: 1.6; overflow-x: hidden;
}

/* Neural Network Background */
.brain-bg-canvas {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -1;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(111, 66, 193, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(32, 201, 151, 0.05), transparent 25%);
}

.brain-container { max-width: 1100px; margin: 0 auto; padding: 0 20px;}

/* Header */
.brain-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 25px 0; margin-bottom: 60px;
}
.brain-brand {
    font-size: 24px; font-weight: 800; color: var(--brain-primary);
    display: flex; align-items: center; gap: 10px;
}
.brain-brand::before {
    content: '🧠'; font-size: 28px;
}
.brain-nav { display: flex; gap: 35px; }
.brain-nav a {
    font-size: 15px; font-weight: 600; color: #6c757d; transition: all 0.3s;
    position: relative;
}
.brain-nav a::after {
    content: ''; position: absolute; bottom: -5px; left: 0; width: 0; height: 2px;
    background: var(--brain-secondary); transition: width 0.3s;
}
.brain-nav a:hover, .brain-nav a.active { color: var(--brain-text); }
.brain-nav a:hover::after, .brain-nav a.active::after { width: 100%; }

/* Hero */
.brain-hero {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 100px; padding: 60px; background: var(--brain-card);
    border-radius: 24px; box-shadow: 0 20px 40px rgba(0,0,0,0.03);
    position: relative; overflow: hidden;
}
.brain-hero::before {
    content: ''; position: absolute; top: 0; right: 0; width: 300px; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(32, 201, 151, 0.1));
}
.bh-content { flex: 1; padding-right: 50px; z-index: 1;}
.bh-content h1 {
    font-size: 48px; font-weight: 800; margin-bottom: 20px; color: var(--brain-text);
    line-height: 1.2; letter-spacing: -1px;
}
.bh-content h1 span { color: var(--brain-primary); }
.bh-content p { font-size: 18px; color: #6c757d; margin-bottom: 40px; max-width: 450px;}

.bh-visual {
    flex: 1; display: flex; justify-content: center; align-items: center; z-index: 1;
}
.neural-node {
    width: 200px; height: 200px; position: relative;
}
.neural-core {
    width: 60px; height: 60px; background: var(--brain-primary); border-radius: 50%;
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    box-shadow: 0 0 30px rgba(111, 66, 193, 0.5); animation: pulseBrain 2s infinite alternate;
}
.neural-orbit {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    border: 1px dashed var(--brain-secondary); border-radius: 50%;
    animation: spinOrbit 10s linear infinite;
}
.neural-satellite {
    width: 15px; height: 15px; background: var(--brain-accent); border-radius: 50%;
    position: absolute; top: -7.5px; left: 50%; transform: translateX(-50%);
    box-shadow: 0 0 10px rgba(253, 126, 20, 0.5);
}
@keyframes pulseBrain { 0% { transform: translate(-50%, -50%) scale(1); } 100% { transform: translate(-50%, -50%) scale(1.1); } }
@keyframes spinOrbit { 100% { transform: rotate(360deg); } }

.btn-brain {
    display: inline-block; padding: 15px 35px; font-size: 16px; font-weight: 600;
    color: #fff; background: var(--brain-primary); border-radius: 12px;
    transition: all 0.3s; margin-right: 15px; box-shadow: 0 10px 20px rgba(111, 66, 193, 0.2);
}
.btn-brain:hover { transform: translateY(-3px); box-shadow: 0 15px 25px rgba(111, 66, 193, 0.3); background: #5a32a3;}
.btn-brain-alt {
    display: inline-block; padding: 15px 35px; font-size: 16px; font-weight: 600;
    color: var(--brain-primary); background: rgba(111, 66, 193, 0.1); border-radius: 12px;
    transition: all 0.3s;
}
.btn-brain-alt:hover { background: rgba(111, 66, 193, 0.15); }

/* Stats */
.brain-stats {
    display: flex; gap: 30px; margin-bottom: 100px;
}
.bs-item {
    flex: 1; background: var(--brain-card); padding: 30px; border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.02); text-align: center;
    border-top: 4px solid var(--brain-secondary);
}
.bs-val { font-size: 40px; font-weight: 800; color: var(--brain-text); margin-bottom: 5px;}
.bs-lbl { font-size: 14px; color: #6c757d; font-weight: 500; text-transform: uppercase; letter-spacing: 1px;}

/* Features */
.brain-features { margin-bottom: 100px;}
.bf-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px;}
.bf-card {
    background: var(--brain-card); padding: 40px; border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.03); transition: all 0.3s;
    display: flex; align-items: flex-start; gap: 20px;
}
.bf-card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(0,0,0,0.05);}
.bf-icon {
    width: 50px; height: 50px; background: rgba(32, 201, 151, 0.1); border-radius: 12px;
    display: flex; justify-content: center; align-items: center; color: var(--brain-secondary);
    font-size: 24px; flex-shrink: 0;
}
.bf-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: var(--brain-text);}
.bf-card p { font-size: 15px; color: #6c757d; line-height: 1.7;}

/* Nodes */
.brain-nodes { margin-bottom: 100px; text-align: center;}
.brain-nodes h2 { font-size: 32px; font-weight: 800; margin-bottom: 40px; color: var(--brain-text);}
.bn-list { display: flex; flex-wrap: wrap; gap: 15px; justify-content: center;}
.bn-item {
    padding: 12px 24px; background: var(--brain-card); color: var(--brain-primary);
    font-weight: 600; border-radius: 30px; font-size: 14px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.03); border: 1px solid rgba(111, 66, 193, 0.1);
}

/* FAQ */
.brain-faq { margin-bottom: 100px; max-width: 800px; margin-left: auto; margin-right: auto;}
.brain-faq h2 { font-size: 32px; font-weight: 800; margin-bottom: 40px; color: var(--brain-text); text-align: center;}
.b-faq-item {
    margin-bottom: 20px; background: var(--brain-card); padding: 30px; border-radius: 16px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.02);
}
.b-fq { font-size: 18px; font-weight: 700; color: var(--brain-primary); margin-bottom: 10px;}
.b-fa { font-size: 15px; color: #6c757d;}

footer { text-align: center; padding: 40px 0; color: #adb5bd; font-size: 14px;}

@media (max-width: 900px) {
    .brain-header { flex-direction: column; gap: 20px; }
    .brain-hero { flex-direction: column; text-align: center; padding: 40px 20px;}
    .bh-content { padding-right: 0; margin-bottom: 50px;}
    .brain-stats { flex-direction: column; gap: 20px;}
    .bf-grid { grid-template-columns: 1fr; }
    .bf-card { flex-direction: column; align-items: center; text-align: center;}
    .btn-brain, .btn-brain-alt { display: block; margin: 10px auto; width: 80%;}
}