:root {
    --crystal-bg: #eef2f5;
    --crystal-surface: rgba(255, 255, 255, 0.7);
    --crystal-dark: #1e293b;
    --crystal-blue: #0284c7;
    --crystal-accent: #38bdf8;
    --crystal-shadow: 0 8px 32px rgba(2, 132, 199, 0.1);
    
    --font-primary: 'Helvetica Neue', Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--crystal-bg);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(2, 132, 199, 0.1), transparent 25%);
    background-attachment: fixed;
    color: var(--crystal-dark);
    font-family: var(--font-primary);
    line-height: 1.6;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }

/* Grid Layout container */
.container {
    display: grid;
    grid-template-columns: 250px 1fr;
    grid-template-rows: auto 1fr auto;
    grid-template-areas: 
        "nav head"
        "nav main"
        "nav foot";
    min-height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    gap: 30px;
    padding: 30px;
}

/* Glassmorphism mixin */
.glass {
    background: var(--crystal-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 16px;
    box-shadow: var(--crystal-shadow);
}

/* Sidebar Nav */
.side-nav {
    grid-area: nav;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 30px;
    height: calc(100vh - 60px);
}
.brand { font-size: 24px; font-weight: bold; color: var(--crystal-blue); margin-bottom: 50px; text-align: center; }
.menu { display: flex; flex-direction: column; gap: 15px; flex-grow: 1; }
.menu a { padding: 12px 20px; border-radius: 8px; font-weight: 500; color: #475569; }
.menu a:hover { background: rgba(255,255,255,0.8); color: var(--crystal-blue); }
.dl-btn {
    background: var(--crystal-blue); color: #fff; text-align: center; padding: 15px; border-radius: 8px; font-weight: bold;
}
.dl-btn:hover { background: #0369a1; box-shadow: 0 4px 15px rgba(2, 132, 199, 0.4); }

/* Header/Hero area */
.top-header {
    grid-area: head;
    padding: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.top-header::before {
    content: ''; position: absolute; right: -50px; top: -50px; width: 200px; height: 200px;
    background: linear-gradient(135deg, var(--crystal-accent), var(--crystal-blue));
    border-radius: 30px; transform: rotate(45deg); opacity: 0.1;
}
.top-header h1 { font-size: 48px; margin-bottom: 20px; line-height: 1.2; color: #0f172a; }
.top-header p { font-size: 18px; color: #475569; max-width: 600px; margin-bottom: 30px; }
.h-acts { display: flex; gap: 20px; }
.btn-w { background: #fff; color: var(--crystal-blue); padding: 12px 25px; border-radius: 8px; font-weight: bold; }
.btn-w:hover { background: var(--crystal-accent); color: #fff; }

/* Main Content Grid */
.main-area { grid-area: main; display: grid; gap: 30px; }

/* Layout block 1: Stats and Trust side by side */
.row-1 { display: grid; grid-template-columns: 2fr 1fr; gap: 30px; }

/* Stats block */
.stats-blk { padding: 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.s-itm { text-align: center; }
.s-itm b { display: block; font-size: 32px; color: var(--crystal-blue); }
.s-itm span { font-size: 13px; color: #64748b; font-weight: 500; }

/* Trust block */
.trust-blk { padding: 40px; display: flex; flex-direction: column; justify-content: center; gap: 20px;}
.t-itm { font-size: 14px; font-weight: bold; color: #334155; display: flex; align-items: center; gap: 10px;}
.t-itm::before { content: ''; width: 8px; height: 8px; background: var(--crystal-accent); border-radius: 50%; }

/* Layout block 2: Features */
.feat-blk { padding: 50px; }
.b-tit { font-size: 24px; margin-bottom: 30px; color: #0f172a; }
.f-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.f-box h3 { font-size: 18px; color: var(--crystal-blue); margin-bottom: 15px; }
.f-box p { font-size: 14px; color: #475569; }

/* Layout block 3: Nodes & Reviews */
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }

/* Nodes */
.node-blk { padding: 40px; }
.n-list { display: flex; flex-direction: column; gap: 15px; }
.n-row { display: flex; justify-content: space-between; padding: 15px; background: rgba(255,255,255,0.5); border-radius: 8px;}
.n-row strong { color: #0f172a; }
.n-row span { color: var(--crystal-blue); font-size: 13px; font-weight: bold;}

/* Reviews */
.rev-blk { padding: 40px; }
.r-box { margin-bottom: 20px; padding-bottom: 20px; border-bottom: 1px solid rgba(2, 132, 199, 0.1); }
.r-box:last-child { border: none; margin-bottom: 0; padding-bottom: 0;}
.r-box p { font-size: 14px; font-style: italic; color: #475569; margin-bottom: 10px; }
.r-box b { font-size: 12px; color: var(--crystal-blue); }

/* FAQ */
.faq-blk { padding: 50px; margin-bottom: 30px; }
.fq-item { margin-bottom: 15px; }
.fq-q { background: rgba(255,255,255,0.5); padding: 15px 20px; border-radius: 8px; font-weight: bold; cursor: pointer; color: #0f172a; }
.fq-a { padding: 15px 20px; font-size: 14px; color: #475569; display: none; }

/* Footer */
.foot { grid-area: foot; padding: 30px; text-align: center; font-size: 14px; color: #64748b; }

@media (max-width: 1000px) {
    .container { grid-template-columns: 1fr; grid-template-areas: "nav" "head" "main" "foot"; padding: 15px; gap: 15px;}
    .side-nav { height: auto; position: static; flex-direction: row; flex-wrap: wrap; justify-content: space-between; align-items: center; padding: 20px;}
    .brand { margin-bottom: 0; }
    .menu { flex-direction: row; gap: 10px; }
    .row-1, .row-2 { grid-template-columns: 1fr; }
    .f-wrap { grid-template-columns: 1fr; }
}