:root {
    --brain-bg: #0f172a;
    --brain-text: #f8fafc;
    --brain-primary: #38bdf8; /* Light Blue */
    --brain-secondary: #1e293b;
    --brain-accent: #818cf8;
    --brain-border: #334155;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--brain-bg); color: var(--brain-text);
    font-family: 'Inter', -apple-system, sans-serif;
    line-height: 1.7; overflow-x: hidden;
}

.brain-container { max-width: 1100px; margin: 0 auto; padding: 0 30px;}

/* Header */
.brain-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 30px 0; margin-bottom: 60px; border-bottom: 1px solid var(--brain-border);
}
.brain-brand {
    font-size: 22px; font-weight: 700; color: var(--brain-primary);
    display: flex; align-items: center; gap: 8px;
}
.brain-brand::before {
    content: '⎈'; font-size: 28px; color: var(--brain-accent);
}
.brain-nav { display: flex; gap: 35px; }
.brain-nav a {
    font-size: 14px; font-weight: 500; color: #cbd5e1; text-decoration: none;
    transition: color 0.3s;
}
.brain-nav a:hover, .brain-nav a.active { color: var(--brain-primary); }

/* Hero */
.brain-hero {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 100px; gap: 60px;
}
.brain-hero-text { flex: 1; }
.brain-hero h1 {
    font-size: 46px; color: #f1f5f9; margin-bottom: 25px; line-height: 1.2;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.brain-hero p { font-size: 18px; color: #94a3b8; margin-bottom: 40px;}

.brain-hero-visual {
    flex: 1; height: 350px; position: relative;
    background: radial-gradient(circle at center, var(--brain-secondary) 0%, transparent 70%);
    display: flex; align-items: center; justify-content: center;
}
.node-circle {
    width: 200px; height: 200px; border-radius: 50%; border: 2px dashed var(--brain-primary);
    position: absolute; animation: rotate 20s linear infinite;
}
.node-circle:nth-child(2) { width: 300px; height: 300px; border-color: var(--brain-accent); animation-direction: reverse; animation-duration: 30s;}
@keyframes rotate { 100% { transform: rotate(360deg); } }
.center-node {
    width: 60px; height: 60px; background: var(--brain-primary); border-radius: 50%;
    box-shadow: 0 0 30px var(--brain-primary); z-index: 10;
}

.btn-brain {
    display: inline-block; padding: 14px 32px; font-size: 15px; font-weight: 600;
    color: var(--brain-bg); background: var(--brain-primary); border-radius: 6px;
    text-decoration: none; transition: all 0.3s;
}
.btn-brain:hover { background: #7dd3fc; box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);}
.btn-brain-alt {
    display: inline-block; padding: 14px 32px; font-size: 15px; font-weight: 600;
    color: var(--brain-primary); background: transparent; border: 1px solid var(--brain-primary);
    border-radius: 6px; text-decoration: none; transition: all 0.3s; margin-left: 15px;
}
.btn-brain-alt:hover { background: rgba(56, 189, 248, 0.1); }

/* Stats */
.brain-stats {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-bottom: 100px;
}
.bs-item {
    background: var(--brain-secondary); padding: 30px; border-radius: 12px;
    border: 1px solid var(--brain-border); text-align: center;
}
.bs-val { font-size: 36px; font-weight: 700; color: var(--brain-primary); margin-bottom: 10px;}
.bs-lbl { font-size: 14px; color: #94a3b8;}

/* Features */
.brain-features { margin-bottom: 100px; }
.brain-features h2 { font-size: 30px; text-align: center; margin-bottom: 50px; color: #f1f5f9;}
.bf-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; }
.bf-card {
    background: var(--brain-secondary); padding: 40px; border-radius: 12px;
    border: 1px solid var(--brain-border); position: relative; overflow: hidden;
}
.bf-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 100%;
    background: var(--brain-primary);
}
.bf-card h3 { font-size: 20px; color: #e2e8f0; margin-bottom: 15px;}
.bf-card p { font-size: 15px; color: #94a3b8;}

/* Nodes */
.brain-nodes { margin-bottom: 100px; }
.brain-nodes h2 { font-size: 30px; text-align: center; margin-bottom: 50px; color: #f1f5f9;}
.bn-list { display: flex; flex-direction: column; gap: 15px; max-width: 800px; margin: 0 auto;}
.bn-item {
    background: var(--brain-secondary); padding: 20px 30px; border-radius: 8px;
    display: flex; justify-content: space-between; align-items: center;
    border: 1px solid var(--brain-border);
}
.bn-status { color: var(--brain-accent); font-size: 13px; font-weight: 600; background: rgba(129, 140, 248, 0.1); padding: 4px 10px; border-radius: 4px;}

/* FAQ */
.brain-faq { margin-bottom: 100px; }
.brain-faq h2 { font-size: 30px; text-align: center; margin-bottom: 50px; color: #f1f5f9;}
.b-faq-item {
    background: var(--brain-secondary); padding: 30px; border-radius: 12px;
    margin-bottom: 20px; border: 1px solid var(--brain-border);
}
.b-fq { font-size: 17px; font-weight: 600; color: #e2e8f0; margin-bottom: 12px;}
.b-fa { font-size: 15px; color: #94a3b8;}

footer {
    text-align: center; padding: 40px 0; color: #64748b; font-size: 14px;
    border-top: 1px solid var(--brain-border);
}

@media (max-width: 900px) {
    .brain-hero { flex-direction: column; text-align: center; }
    .brain-hero-visual { display: none; }
    .bf-grid { grid-template-columns: 1fr; }
    .brain-stats { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .brain-header { flex-direction: column; gap: 20px; }
    .btn-brain, .btn-brain-alt { display: block; margin: 10px auto; width: 80%;}
}