:root {
    --primary-color: #0d6efd;
    --success-color: #25d366;
    --dark-color: #212529;
    --light-bg: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.bg-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.card {
    border: none;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.brand-title {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 2.5rem;
}

.brand-title i {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.whatsapp-info i {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% {
        animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
        transform: translate3d(0,0,0);
    }
    40%, 43% {
        animation-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
        transform: translate3d(0, -10px, 0);
    }
    70% {
        animation-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
        transform: translate3d(0, -5px, 0);
    }
    90% {
        transform: translate3d(0,-2px,0);
    }
}

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
    border-radius: 10px;
    font-weight: 600;
    padding: 12px 20px;
    transition: all 0.3s ease;
}

.btn-success:hover {
    background-color: #1db551;
    border-color: #1db551;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 211, 102, 0.3);
}

.btn-success:active {
    transform: translateY(0);
}

.features {
    border-top: 1px solid #e9ecef;
    padding-top: 1rem;
}

.alert {
    border-radius: 10px;
    border: none;
}

.alert-success {
    background-color: rgba(37, 211, 102, 0.1);
    color: var(--success-color);
}

.alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: #dc3545;
}

.alert-info {
    background-color: rgba(13, 110, 253, 0.1);
    color: var(--primary-color);
}

.modal-content {
    border: none;
    border-radius: 15px;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* Responsive */
@media (max-width: 576px) {
    .card-body {
        padding: 2rem 1.5rem !important;
    }
    
    .brand-title {
        font-size: 2rem;
    }
    
    .whatsapp-info i {
        font-size: 3rem !important;
    }
}

/* Loading states */
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}