:root {
    --gray-bg: #f4f5f7;
    --gray-text: #2c3e50;
    --gray-primary: #34495e;
    --gray-secondary: #7f8c8d;
    --gray-accent: #bdc3c7;
    --font-gray: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--gray-bg); color: var(--gray-text);
    font-family: var(--font-gray);
    line-height: 1.6;
}
a { text-decoration: none; color: inherit; }

.gray-container { max-width: 1000px; margin: 0 auto; padding: 0 20px;}

/* Header */
.gray-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 30px 0; border-bottom: 1px solid var(--gray-accent);
    margin-bottom: 50px;
}
.gray-brand {
    font-size: 24px; font-weight: bold; color: var(--gray-primary);
    letter-spacing: 1px; text-transform: uppercase;
}
.gray-brand::before {
    content: ''; display: inline-block; width: 12px; height: 12px;
    background: var(--gray-secondary); margin-right: 10px;
}
.gray-nav { display: flex; gap: 30px; }
.gray-nav a {
    font-size: 14px; font-weight: 500; color: var(--gray-secondary);
    transition: color 0.2s; text-transform: uppercase; letter-spacing: 1px;
}
.gray-nav a:hover, .gray-nav a.active { color: var(--gray-primary); }

/* Hero */
.gray-hero {
    text-align: center; margin-bottom: 80px; padding: 40px 0;
}
.gray-hero h1 {
    font-size: 42px; font-weight: 300; margin-bottom: 20px; color: var(--gray-primary);
    letter-spacing: -0.5px;
}
.gray-hero p {
    font-size: 18px; color: var(--gray-secondary); margin-bottom: 40px;
    max-width: 700px; margin-left: auto; margin-right: auto; font-weight: 300;
}
.btn-gray {
    display: inline-block; padding: 14px 32px; font-size: 14px; font-weight: 600;
    color: #fff; background: var(--gray-primary);
    transition: background 0.2s; text-transform: uppercase; letter-spacing: 1px; margin: 0 10px;
}
.btn-gray:hover { background: #1a252f; }
.btn-gray-alt {
    display: inline-block; padding: 14px 32px; font-size: 14px; font-weight: 600;
    color: var(--gray-primary); background: transparent; border: 1px solid var(--gray-primary);
    transition: all 0.2s; text-transform: uppercase; letter-spacing: 1px; margin: 0 10px;
}
.btn-gray-alt:hover { background: var(--gray-accent); color: #fff; border-color: var(--gray-accent);}

/* Stats */
.gray-stats {
    display: flex; justify-content: center; gap: 60px; margin-bottom: 80px;
    border-top: 1px solid var(--gray-accent); border-bottom: 1px solid var(--gray-accent);
    padding: 30px 0;
}
.gs-item { text-align: center; }
.gs-val { font-size: 36px; font-weight: 300; color: var(--gray-primary); margin-bottom: 5px;}
.gs-lbl { font-size: 12px; color: var(--gray-secondary); text-transform: uppercase; letter-spacing: 1px;}

/* Grid */
.gray-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; margin-bottom: 80px;}
.gg-card {
    padding: 40px; background: #fff; border: 1px solid var(--gray-accent);
}
.gg-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 15px; color: var(--gray-primary);}
.gg-card p { font-size: 15px; color: var(--gray-secondary); line-height: 1.6;}

/* Nodes */
.gray-nodes { margin-bottom: 80px;}
.gray-nodes h2 { font-size: 24px; font-weight: 300; margin-bottom: 30px; color: var(--gray-primary); text-align: center;}
.node-gray-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px;}
.n-gray {
    padding: 20px; background: #fff; border: 1px solid var(--gray-accent);
    font-size: 14px; color: var(--gray-primary); text-align: center;
}
.n-gray span { display: block; font-size: 12px; color: var(--gray-secondary); margin-top: 5px;}

/* FAQ */
.gray-faq { margin-bottom: 80px; max-width: 800px; margin-left: auto; margin-right: auto;}
.gray-faq h2 { font-size: 24px; font-weight: 300; margin-bottom: 40px; text-align: center; color: var(--gray-primary);}
.faq-item { margin-bottom: 30px;}
.fq-q { font-size: 16px; font-weight: 600; color: var(--gray-primary); margin-bottom: 10px;}
.fq-a { font-size: 15px; color: var(--gray-secondary);}

footer { text-align: center; padding: 40px 0; border-top: 1px solid var(--gray-accent); font-size: 12px; color: var(--gray-secondary); text-transform: uppercase; letter-spacing: 1px;}

@media (max-width: 768px) {
    .gray-header { flex-direction: column; gap: 20px; }
    .gray-hero h1 { font-size: 32px; }
    .gray-stats { flex-direction: column; gap: 30px; border: none; padding: 0;}
    .gray-grid { grid-template-columns: 1fr; }
    .btn-gray, .btn-gray-alt { display: block; margin: 10px auto; width: 80%;}
}