:root {
    --sync-bg: #f8f9fa;
    --sync-text: #2d3748;
    --sync-primary: #6b46c1; /* Purple */
    --sync-secondary: #ffffff;
    --sync-accent: #ed8936; /* Orange */
    --sync-border: #e2e8f0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--sync-bg); color: var(--sync-text);
    font-family: 'Nunito', 'Segoe UI', sans-serif;
    line-height: 1.6; overflow-x: hidden;
}

.sync-container { max-width: 1100px; margin: 0 auto; padding: 0 20px;}

/* Header */
.sync-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 25px 0; margin-bottom: 50px;
}
.sync-brand {
    font-size: 26px; font-weight: 800; color: var(--sync-primary);
    display: flex; align-items: center; gap: 10px;
}
.sync-brand::before {
    content: '∞'; font-size: 32px; color: var(--sync-accent); font-weight: normal;
}
.sync-nav { display: flex; gap: 30px; background: var(--sync-secondary); padding: 10px 30px; border-radius: 30px; box-shadow: 0 4px 6px rgba(0,0,0,0.05);}
.sync-nav a {
    font-size: 15px; font-weight: 700; color: #718096; text-decoration: none;
    transition: color 0.3s;
}
.sync-nav a:hover, .sync-nav a.active { color: var(--sync-primary); }

/* Hero */
.sync-hero {
    text-align: center; margin-bottom: 80px; padding: 60px 20px;
    background: var(--sync-secondary); border-radius: 24px;
    box-shadow: 0 10px 30px rgba(107, 70, 193, 0.08); position: relative; overflow: hidden;
}
.sync-hero::before {
    content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(107,70,193,0.05) 0%, transparent 50%);
    z-index: 0; pointer-events: none;
}
.sync-hero-content { position: relative; z-index: 1; }
.sync-hero h1 {
    font-size: 44px; color: #1a202c; margin-bottom: 20px; font-weight: 800;
}
.sync-hero p { font-size: 18px; color: #4a5568; margin-bottom: 40px; max-width: 700px; margin-left: auto; margin-right: auto;}

.btn-sync {
    display: inline-block; padding: 16px 40px; font-size: 16px; font-weight: 800;
    color: #fff; background: var(--sync-primary); border-radius: 30px;
    text-decoration: none; transition: all 0.3s; box-shadow: 0 4px 15px rgba(107, 70, 193, 0.4);
}
.btn-sync:hover { background: #553c9a; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(107, 70, 193, 0.5);}

/* Devices Visualization */
.sync-devices {
    display: flex; justify-content: center; align-items: center; gap: 20px; margin-bottom: 80px;
}
.device-icon {
    width: 80px; height: 80px; background: var(--sync-secondary); border-radius: 16px;
    display: flex; align-items: center; justify-content: center; font-size: 32px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05); color: var(--sync-primary);
    position: relative; border: 2px solid var(--sync-border);
}
.device-icon::after {
    content: '↔'; position: absolute; right: -25px; top: 50%; transform: translateY(-50%);
    color: var(--sync-accent); font-size: 24px;
}
.device-icon:last-child::after { display: none; }

/* Features */
.sync-features { margin-bottom: 80px; }
.sf-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.sf-card {
    background: var(--sync-secondary); padding: 35px; border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03); text-align: center;
    border-top: 4px solid transparent; transition: border-color 0.3s, transform 0.3s;
}
.sf-card:hover { border-color: var(--sync-primary); transform: translateY(-5px);}
.sf-card h3 { font-size: 20px; color: #2d3748; margin-bottom: 15px;}
.sf-card p { font-size: 15px; color: #718096;}

/* Nodes */
.sync-nodes { margin-bottom: 80px; background: var(--sync-primary); padding: 60px 20px; border-radius: 24px; color: #fff; text-align: center;}
.sync-nodes h2 { font-size: 32px; margin-bottom: 40px; color: #fff;}
.sn-list { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap;}
.sn-item {
    background: rgba(255,255,255,0.1); padding: 15px 25px; border-radius: 12px;
    font-weight: bold; font-size: 16px; border: 1px solid rgba(255,255,255,0.2);
}

/* FAQ */
.sync-faq { margin-bottom: 100px; }
.sync-faq h2 { font-size: 32px; text-align: center; margin-bottom: 40px; color: #1a202c;}
.s-faq-item {
    background: var(--sync-secondary); padding: 25px 30px; border-radius: 16px;
    margin-bottom: 20px; box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}
.s-fq { font-size: 18px; font-weight: 800; color: #2d3748; margin-bottom: 10px;}
.s-fa { font-size: 15px; color: #718096;}

footer {
    text-align: center; padding: 30px 0; color: #a0aec0; font-size: 14px;
}

@media (max-width: 768px) {
    .sync-header { flex-direction: column; gap: 20px; }
    .sync-nav { width: 100%; justify-content: center; flex-wrap: wrap;}
    .sync-hero h1 { font-size: 32px; }
    .sync-devices { flex-wrap: wrap; }
    .device-icon::after { display: none; }
    .sf-grid { grid-template-columns: 1fr; }
}