:root {
    --bp-bg: #002b4f;
    --bp-grid: rgba(0, 163, 255, 0.2);
    --bp-line: #00a3ff;
    --bp-text: #e0f2fe;
    --bp-highlight: #facc15;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--bp-bg);
    color: var(--bp-text);
    font-family: 'Courier New', Courier, monospace; /* Monospace for blueprint feel */
    line-height: 1.5;
    position: relative;
    overflow-x: hidden;
}

/* Blueprint Grid Background */
body::before {
    content: ''; position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    background-size: 50px 50px;
    background-image: 
        linear-gradient(to right, var(--bp-grid) 1px, transparent 1px),
        linear-gradient(to bottom, var(--bp-grid) 1px, transparent 1px);
    z-index: -1;
}

a { text-decoration: none; color: inherit; }

/* Structural Layout: Sidebar left, main content right with blueprint borders */
.layout { display: flex; min-height: 100vh; padding: 20px; gap: 20px; }

.side-panel {
    width: 250px; border: 2px solid var(--bp-line); padding: 30px 20px;
    background: rgba(0, 43, 79, 0.8); position: sticky; top: 20px; height: calc(100vh - 40px);
    display: flex; flex-direction: column;
}
/* Blueprint corner accents */
.bp-box { position: relative; }
.bp-box::before, .bp-box::after { content: ''; position: absolute; width: 10px; height: 10px; border: 2px solid var(--bp-line); }
.bp-box::before { top: -2px; left: -2px; border-right: none; border-bottom: none; }
.bp-box::after { bottom: -2px; right: -2px; border-left: none; border-top: none; }

.brand { font-size: 24px; font-weight: bold; color: var(--bp-highlight); margin-bottom: 40px; border-bottom: 1px dashed var(--bp-line); padding-bottom: 10px;}
.menu { display: flex; flex-direction: column; gap: 15px; flex-grow: 1;}
.menu a { font-size: 14px; text-transform: uppercase; padding: 8px 10px; border: 1px solid transparent; transition: 0.2s;}
.menu a:hover, .menu a.active { border-color: var(--bp-line); background: rgba(0, 163, 255, 0.1); }
.dl-btn {
    background: var(--bp-line); color: var(--bp-bg); padding: 12px; text-align: center;
    font-weight: bold; text-transform: uppercase; border: 2px solid var(--bp-line);
}
.dl-btn:hover { background: transparent; color: var(--bp-line); }

.main-content {
    flex-grow: 1; display: flex; flex-direction: column; gap: 20px;
}

/* Header / Hero */
.hero-box { border: 2px solid var(--bp-line); padding: 50px; background: rgba(0, 43, 79, 0.8); }
.hero-box h1 { font-size: 48px; color: var(--bp-highlight); margin-bottom: 20px; text-transform: uppercase;}
.hero-box p { font-size: 16px; margin-bottom: 40px; max-width: 700px;}
.h-acts { display: flex; gap: 20px; }
.btn-w { background: var(--bp-highlight); color: var(--bp-bg); padding: 12px 25px; font-weight: bold; border: 2px solid var(--bp-highlight);}
.btn-w:hover { background: transparent; color: var(--bp-highlight); }

/* Multi-column row */
.col-row { display: flex; gap: 20px; }
.col-50 { flex: 1; border: 2px solid var(--bp-line); padding: 30px; background: rgba(0, 43, 79, 0.8); }

.sec-title { font-size: 18px; color: var(--bp-highlight); border-bottom: 1px dashed var(--bp-line); padding-bottom: 10px; margin-bottom: 20px; text-transform: uppercase;}

/* Trust & Stats */
.t-line { font-size: 14px; margin-bottom: 10px; display: flex; justify-content: space-between;}
.t-line::before { content: '>'; color: var(--bp-line); margin-right: 10px;}

.s-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.s-item b { display: block; font-size: 28px; color: var(--bp-line); }
.s-item span { font-size: 12px; color: #aaa; text-transform: uppercase;}

/* Features */
.f-box { margin-bottom: 25px; }
.f-box h3 { font-size: 16px; color: var(--bp-line); margin-bottom: 10px; display: inline-block; border: 1px solid var(--bp-line); padding: 2px 8px;}
.f-box p { font-size: 14px; color: #ccc; }

/* Nodes table style */
.n-table { width: 100%; border-collapse: collapse; font-size: 14px;}
.n-table th, .n-table td { border: 1px solid var(--bp-line); padding: 10px; text-align: left;}
.n-table th { color: var(--bp-highlight); background: rgba(0, 163, 255, 0.1); }

/* Reviews */
.r-item { margin-bottom: 20px; border-left: 2px solid var(--bp-highlight); padding-left: 15px;}
.r-item p { font-size: 14px; font-style: italic; margin-bottom: 5px; color: #ccc;}
.r-item b { font-size: 12px; color: var(--bp-line); }

/* FAQ */
.q-acc { margin-bottom: 15px; }
.q { font-size: 14px; font-weight: bold; color: var(--bp-line); cursor: pointer; }
.q::before { content: '[?] '; color: var(--bp-highlight);}
.a { font-size: 14px; color: #aaa; margin-top: 10px; padding-left: 25px; display: none;}

footer { border: 2px solid var(--bp-line); padding: 20px; text-align: center; background: rgba(0, 43, 79, 0.8); font-size: 12px; color: #aaa;}

@media (max-width: 900px) {
    .layout { flex-direction: column; }
    .side-panel { width: 100%; height: auto; position: static; flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between; padding: 20px;}
    .brand { margin-bottom: 0; border-bottom: none; padding-bottom: 0;}
    .menu { flex-direction: row; gap: 10px; flex-wrap: wrap;}
    .dl-btn { margin-top: 10px; width: 100%; }
    .col-row { flex-direction: column; }
    .s-grid { grid-template-columns: 1fr; }
}