:root {
    --multi-bg: #f3f4f6;
    --multi-text: #1f2937;
    --multi-primary: #6366f1; /* Violet */
    --multi-secondary: #f59e0b; /* Amber */
    --multi-card: #ffffff;
    --multi-border: #e5e7eb;
}

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

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

/* Header */
.multi-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 24px 0; margin-bottom: 64px;
}
.multi-brand {
    font-size: 24px; font-weight: 800; color: var(--multi-primary);
    display: flex; align-items: center; gap: 8px;
}
.multi-brand::before { content: '🔗'; font-size: 28px; }
.multi-nav { display: flex; gap: 32px; }
.multi-nav a {
    color: #4b5563; text-decoration: none; font-size: 15px; font-weight: 600;
    transition: color 0.2s;
}
.multi-nav a:hover, .multi-nav a.active { color: var(--multi-primary); }

/* Hero */
.multi-hero {
    text-align: center; margin-bottom: 80px;
}
.multi-hero h1 {
    font-size: 48px; font-weight: 800; color: #111827; margin-bottom: 24px;
    letter-spacing: -1px;
}
.multi-hero p {
    font-size: 18px; color: #6b7280; max-width: 700px; margin: 0 auto 40px;
}

.btn-multi {
    display: inline-block; padding: 16px 40px; font-size: 16px; font-weight: 600;
    color: #fff; background: var(--multi-primary); border-radius: 8px;
    text-decoration: none; transition: background 0.2s, transform 0.2s;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.2), 0 2px 4px -1px rgba(99, 102, 241, 0.1);
}
.btn-multi:hover { background: #4f46e5; transform: translateY(-2px); }

/* Devices Grid */
.multi-devices { margin-bottom: 96px; }
.d-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.d-card {
    background: var(--multi-card); padding: 40px 24px; border-radius: 16px;
    text-align: center; border: 1px solid var(--multi-border);
    transition: all 0.3s ease; position: relative; overflow: hidden;
}
.d-card:hover {
    border-color: var(--multi-primary); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}
.d-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
    background: var(--multi-secondary); transform: scaleX(0); transition: transform 0.3s;
}
.d-card:hover::before { transform: scaleX(1); }
.d-icon { font-size: 48px; margin-bottom: 24px; }
.d-card h3 { font-size: 20px; font-weight: 700; color: #111827; margin-bottom: 12px;}
.d-card p { font-size: 14px; color: #6b7280;}

/* Sync Feature */
.multi-sync {
    background: #fff; border-radius: 24px; padding: 64px; display: flex;
    align-items: center; gap: 64px; margin-bottom: 96px; border: 1px solid var(--multi-border);
}
.sync-text { flex: 1; }
.sync-text h2 { font-size: 32px; font-weight: 800; color: #111827; margin-bottom: 24px;}
.sync-text p { font-size: 16px; color: #4b5563; margin-bottom: 24px;}
.sync-visual { flex: 1; text-align: center; font-size: 100px; color: var(--multi-primary);}

/* FAQ */
.multi-faq { margin-bottom: 80px; max-width: 800px; margin-left: auto; margin-right: auto;}
.multi-faq h2 { font-size: 32px; font-weight: 800; text-align: center; margin-bottom: 48px;}
.m-faq-item { margin-bottom: 32px; }
.m-fq { font-weight: 700; font-size: 18px; color: #111827; margin-bottom: 12px;}
.m-fa { color: #4b5563; font-size: 15px;}

footer {
    text-align: center; padding: 32px 0; color: #9ca3af; font-size: 14px;
    border-top: 1px solid var(--multi-border);
}

@media (max-width: 900px) {
    .d-grid { grid-template-columns: repeat(2, 1fr); }
    .multi-sync { flex-direction: column; text-align: center; padding: 40px 24px;}
}
@media (max-width: 600px) {
    .d-grid { grid-template-columns: 1fr; }
    .multi-header { flex-direction: column; gap: 16px; }
}