* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: white;
    margin-bottom: 30px;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h2 {
    color: #333;
    margin-bottom: 20px;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

.card h3 {
    color: #555;
    margin-bottom: 15px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 25px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 10px 5px 10px 0;
}

button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.status, .status-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 8px;
    font-weight: 600;
    display: none;
}

.status.success, .status-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.status.error, .status-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

.status.info, .status-message.info {
    background-color: #cce7ff;
    color: #004085;
    border: 1px solid #b3d7ff;
    display: block;
}

/* Botón de llamada premium para Chrome Android */
.call-button-container {
    background: #28a745;
    background: linear-gradient(135deg, #28a745 0%, #218838 100%);
    color: white;
    padding: 25px;
    margin: 25px 0;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(40, 167, 69, 0.3);
    border: none;
    animation: pulse 2s infinite;
}

.call-button-container h2 {
    font-size: 1.4rem;
    margin-bottom: 5px;
    color: white;
    border: none;
}

.call-button-container p {
    font-size: 1rem;
    opacity: 0.9;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.info {
    background: linear-gradient(135deg, #e3f2fd 0%, #f8f9ff 100%);
    border-left: 5px solid #2196F3;
}

.info ol {
    padding-left: 20px;
    line-height: 1.6;
}

.info li {
    margin-bottom: 8px;
    color: #555;
}

#usersList ul {
    list-style-type: none;
    padding: 0;
}

#usersList li {
    background: #f8f9fa;
    margin: 5px 0;
    padding: 10px;
    border-radius: 5px;
    border-left: 4px solid #667eea;
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    .card {
        padding: 20px;
    }
    
    button {
        width: 100%;
        margin: 10px 0;
    }
}