:root {
    --iso-bg: #f8f9fa;
    --iso-text: #334155;
    --iso-primary: #3b82f6;
    --iso-secondary: #f59e0b;
    --iso-accent: #10b981;
    --iso-surface: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--iso-bg); color: var(--iso-text);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background-image: 
        linear-gradient(30deg, #f1f5f9 12%, transparent 12.5%, transparent 87%, #f1f5f9 87.5%, #f1f5f9),
        linear-gradient(150deg, #f1f5f9 12%, transparent 12.5%, transparent 87%, #f1f5f9 87.5%, #f1f5f9),
        linear-gradient(30deg, #f1f5f9 12%, transparent 12.5%, transparent 87%, #f1f5f9 87.5%, #f1f5f9),
        linear-gradient(150deg, #f1f5f9 12%, transparent 12.5%, transparent 87%, #f1f5f9 87.5%, #f1f5f9),
        linear-gradient(60deg, #e2e8f0 25%, transparent 25.5%, transparent 75%, #e2e8f0 75%, #e2e8f0),
        linear-gradient(60deg, #e2e8f0 25%, transparent 25.5%, transparent 75%, #e2e8f0 75%, #e2e8f0);
    background-size: 80px 140px;
    background-position: 0 0, 0 0, 40px 70px, 40px 70px, 0 0, 40px 70px;
    background-attachment: fixed;
    opacity: 0.9;
}
a { text-decoration: none; color: inherit; }

.iso-container { max-width: 1200px; margin: 0 auto; padding: 20px; position: relative; z-index: 1;}

/* Isometric Box Mixin */
.iso-box {
    background: var(--iso-surface);
    border-radius: 15px;
    box-shadow: 
        -10px 10px 20px rgba(0,0,0,0.05),
        -1px 1px 0 #e2e8f0,
        -2px 2px 0 #e2e8f0,
        -3px 3px 0 #e2e8f0,
        -4px 4px 0 #e2e8f0,
        -5px 5px 0 #e2e8f0;
    border: 1px solid #f1f5f9;
    transition: transform 0.3s, box-shadow 0.3s;
}
.iso-box:hover {
    transform: translate(5px, -5px);
    box-shadow: 
        -15px 15px 25px rgba(0,0,0,0.08),
        -1px 1px 0 #cbd5e1,
        -2px 2px 0 #cbd5e1,
        -3px 3px 0 #cbd5e1,
        -4px 4px 0 #cbd5e1,
        -5px 5px 0 #cbd5e1,
        -6px 6px 0 #cbd5e1,
        -7px 7px 0 #cbd5e1;
}

/* Header */
.iso-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 30px; margin-bottom: 50px;
}
.iso-brand {
    font-size: 28px; font-weight: 900; color: var(--iso-primary);
    text-shadow: -2px 2px 0 #bfdbfe;
}
.iso-nav { display: flex; gap: 20px; }
.iso-nav a {
    font-weight: 700; color: #64748b; padding: 10px 20px;
    border-radius: 10px; transition: all 0.2s;
}
.iso-nav a:hover, .iso-nav a.active {
    color: var(--iso-primary); background: #eff6ff;
    box-shadow: -2px 2px 0 #bfdbfe; transform: translate(2px, -2px);
}

/* Hero */
.iso-hero {
    display: flex; align-items: center; justify-content: space-between;
    padding: 60px 40px; margin-bottom: 60px;
}
.hero-content { flex: 1; padding-right: 40px;}
.iso-hero h1 { font-size: 48px; font-weight: 900; margin-bottom: 20px; color: var(--iso-text); line-height: 1.2;}
.iso-hero p { font-size: 18px; color: #64748b; margin-bottom: 40px; font-weight: 500;}
.hero-visual {
    flex: 1; display: flex; justify-content: center; align-items: center;
    min-height: 300px;
}
.iso-city {
    width: 200px; height: 200px; background: var(--iso-primary);
    transform: rotateX(60deg) rotateZ(-45deg);
    transform-style: preserve-3d;
    box-shadow: -20px 20px 40px rgba(59, 130, 246, 0.3);
    position: relative;
}
.iso-city::before {
    content: ''; position: absolute; width: 100%; height: 50px;
    background: #2563eb; bottom: -50px; left: 0;
    transform-origin: top; transform: rotateX(-90deg);
}
.iso-city::after {
    content: ''; position: absolute; width: 50px; height: 100%;
    background: #1d4ed8; top: 0; left: -50px;
    transform-origin: right; transform: rotateY(90deg);
}

.btn-iso {
    display: inline-block; padding: 15px 35px; font-size: 18px; font-weight: 800;
    color: #fff; background: var(--iso-primary); border-radius: 10px;
    box-shadow: -5px 5px 0 #1d4ed8; transition: all 0.1s; margin-right: 15px; border: none; cursor: pointer;
}
.btn-iso:active { transform: translate(-5px, 5px); box-shadow: 0 0 0 #1d4ed8;}
.btn-iso-alt {
    display: inline-block; padding: 15px 35px; font-size: 18px; font-weight: 800;
    color: var(--iso-primary); background: var(--iso-surface); border-radius: 10px;
    border: 2px solid var(--iso-primary); box-shadow: -5px 5px 0 #bfdbfe; transition: all 0.1s; cursor: pointer;
}
.btn-iso-alt:active { transform: translate(-5px, 5px); box-shadow: 0 0 0 #bfdbfe;}

/* Stats */
.iso-stats {
    display: flex; justify-content: space-between; margin-bottom: 60px; gap: 20px;
}
.is-item {
    flex: 1; padding: 30px; text-align: center;
}
.is-val { font-size: 36px; font-weight: 900; color: var(--iso-secondary); margin-bottom: 5px; text-shadow: -2px 2px 0 #fde68a;}
.is-lbl { font-size: 14px; font-weight: 700; color: #64748b;}

/* Grid */
.iso-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-bottom: 60px;}
.ig-card { padding: 40px 30px; text-align: center;}
.ig-icon {
    width: 70px; height: 70px; margin: 0 auto 20px;
    background: #eff6ff; border-radius: 15px;
    display: flex; align-items: center; justify-content: center;
    font-size: 32px; color: var(--iso-primary);
    transform: rotateX(60deg) rotateZ(-45deg);
    box-shadow: -5px 5px 0 #bfdbfe;
}
.ig-card h3 { font-size: 22px; font-weight: 800; margin-bottom: 15px;}
.ig-card p { font-size: 15px; color: #64748b; font-weight: 500;}

/* Nodes */
.iso-nodes { padding: 40px; margin-bottom: 60px; text-align: center;}
.iso-nodes h2 { font-size: 28px; font-weight: 900; margin-bottom: 30px; color: var(--iso-primary);}
.node-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px;}
.n-iso {
    padding: 15px 20px; font-weight: 700; color: #475569;
    background: #f8fafc; border-radius: 10px;
    border: 1px solid #e2e8f0; display: flex; justify-content: space-between;
}
.n-iso span { color: var(--iso-accent);}

/* FAQ */
.iso-faq { padding: 40px; margin-bottom: 60px;}
.iso-faq h2 { font-size: 28px; font-weight: 900; margin-bottom: 30px; text-align: center;}
.faq-item { margin-bottom: 25px; padding-bottom: 25px; border-bottom: 2px dashed #e2e8f0;}
.faq-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none;}
.fq-q { font-size: 18px; font-weight: 800; color: var(--iso-secondary); margin-bottom: 10px;}
.fq-a { font-size: 15px; color: #64748b; font-weight: 500;}

footer { text-align: center; padding: 30px; font-weight: 700; color: #94a3b8;}

@media (max-width: 900px) {
    .iso-header { flex-direction: column; gap: 15px; padding: 20px;}
    .iso-hero { flex-direction: column; text-align: center; padding: 40px 20px;}
    .hero-content { padding-right: 0; margin-bottom: 40px;}
    .hero-visual { display: none; }
    .iso-stats { flex-wrap: wrap; }
    .is-item { min-width: 45%; }
    .iso-grid { grid-template-columns: 1fr; }
    .btn-iso, .btn-iso-alt { display: block; margin: 10px auto; width: 100%;}
}