:root {
    --plat-bg: #0f172a;
    --plat-text: #f8fafc;
    --plat-primary: #3b82f6; /* Blue */
    --plat-secondary: #8b5cf6; /* Purple */
    --plat-card: #1e293b;
    --plat-border: #334155;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--plat-bg); color: var(--plat-text);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
}

.plat-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Header */
.plat-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 24px 0; border-bottom: 1px solid var(--plat-border);
    margin-bottom: 64px;
}
.plat-brand {
    font-size: 24px; font-weight: 800; color: #fff;
    display: flex; align-items: center; gap: 8px; letter-spacing: 1px;
}
.plat-brand::before { content: '🛡️'; font-size: 28px; }
.plat-nav { display: flex; gap: 32px; }
.plat-nav a {
    color: #94a3b8; text-decoration: none; font-size: 15px; font-weight: 500;
    transition: color 0.2s;
}
.plat-nav a:hover, .plat-nav a.active { color: var(--plat-primary); }

/* Hero */
.plat-hero {
    text-align: center; margin-bottom: 80px; padding: 60px 0;
    background: radial-gradient(circle at center, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
}
.plat-hero h1 {
    font-size: 48px; font-weight: 800; color: #fff; margin-bottom: 24px;
    letter-spacing: -1px;
}
.plat-hero p {
    font-size: 18px; color: #94a3b8; max-width: 700px; margin: 0 auto 40px;
}

.btn-plat {
    display: inline-block; padding: 16px 40px; font-size: 16px; font-weight: 600;
    color: #fff; background: var(--plat-primary); border-radius: 8px;
    text-decoration: none; transition: background 0.2s;
}
.btn-plat:hover { background: #2563eb; }

/* Platform Features */
.plat-features { margin-bottom: 96px; }
.p-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.p-card {
    background: var(--plat-card); padding: 32px; border-radius: 16px;
    border: 1px solid var(--plat-border); text-align: center;
    transition: transform 0.3s, border-color 0.3s;
}
.p-card:hover {
    transform: translateY(-5px); border-color: var(--plat-primary);
}
.p-icon {
    font-size: 40px; margin-bottom: 20px; color: var(--plat-primary);
}
.p-card h3 { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px;}
.p-card p { font-size: 14px; color: #94a3b8;}

/* Architecture */
.plat-arch {
    background: linear-gradient(135deg, var(--plat-card) 0%, #0f172a 100%);
    border: 1px solid var(--plat-border); border-radius: 24px; padding: 64px;
    text-align: center; margin-bottom: 96px;
}
.plat-arch h2 { font-size: 32px; font-weight: 800; color: #fff; margin-bottom: 24px;}
.plat-arch p { font-size: 16px; color: #94a3b8; max-width: 800px; margin: 0 auto 48px;}
.arch-diagram {
    display: flex; justify-content: center; align-items: center; gap: 20px; font-size: 24px; color: var(--plat-primary);
}
.arch-box {
    background: var(--plat-bg); border: 1px solid var(--plat-border); padding: 20px 40px; border-radius: 8px; color: #fff; font-weight: bold; font-size: 16px;
}

/* FAQ */
.plat-faq { margin-bottom: 80px; max-width: 800px; margin-left: auto; margin-right: auto;}
.plat-faq h2 { font-size: 32px; font-weight: 800; color: #fff; text-align: center; margin-bottom: 48px;}
.p-faq-item { margin-bottom: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--plat-border);}
.p-fq { font-weight: 600; font-size: 18px; color: #fff; margin-bottom: 12px;}
.p-fa { color: #94a3b8; font-size: 15px;}

footer {
    text-align: center; padding: 32px 0; color: #64748b; font-size: 14px;
    border-top: 1px solid var(--plat-border);
}

@media (max-width: 900px) {
    .p-grid { grid-template-columns: repeat(2, 1fr); }
    .arch-diagram { flex-direction: column; }
}
@media (max-width: 600px) {
    .p-grid { grid-template-columns: 1fr; }
    .plat-header { flex-direction: column; gap: 16px; }
}