:root {
    --whatsapp: #25D366;
    --dark: #0F172A;
}

body { font-family: 'Plus Jakarta Sans', sans-serif; }

.text-gradient {
    background: linear-gradient(135deg, #0F172A 0%, #25D366 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.bg-grid {
    background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
    background-size: 40px 40px;
}

.nav-glass {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(15px);
}

.active-tab {
    background: white;
    border-color: var(--whatsapp);
    color: var(--dark);
}

.inactive-tab {
    background: transparent;
    border-color: transparent;
    opacity: 0.5;
}

.chat-received {
    background: white;
    padding: 12px 16px;
    border-radius: 4px 18px 18px 18px;
    font-size: 12px;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    align-self: flex-start;
    max-width: 85%;
}

.chat-sent {
    background: #DCF8C6;
    padding: 12px 16px;
    border-radius: 18px 4px 18px 18px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    align-self: flex-end;
    margin-left: auto;
    max-width: 85%;
}

.card-premium {
    background: white;
    padding: 24px;
    border-radius: 32px;
    border: 1px solid #f1f5f9;
    transition: all 0.5s ease;
}

.card-premium:hover {
    box-shadow: 0 30px 60px -15px rgba(0,0,0,0.1);
    border-color: var(--whatsapp);
    transform: translateY(-5px);
}