:root {
    --primary: #4285f4;
    --danger: #ea4335;
    --success: #34a853;
    --warning: #fbbc05;
}

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

body {
    font-family: 'Roboto', Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    max-width: 100%;
    min-height: 100vh;
}

h2 {
    color: var(--primary);
    text-align: center;
    margin-bottom: 25px;
    font-size: 1.8rem;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 1.1rem;
    color: #555;
}

input {
    width: 100%;
    padding: 15px;
    font-size: 1.1rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    background-color: #fff;
    transition: border 0.3s;
}

input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.2);
}

input::placeholder {
    color: #aaa;
    font-size: 1rem;
}

button {
    width: 100%;
    padding: 16px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.2rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
    margin-top: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

button:active {
    transform: scale(0.98);
    background-color: #3367d6;
}

#resultado {
    margin-top: 25px;
    padding: 20px;
    border-radius: 8px;
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    font-size: 1.1rem;
    line-height: 1.8;
}

.asistencia {
    color: var(--success);
    font-weight: bold;
}

.inasistencia {
    color: var(--danger);
    font-weight: bold;
}

.alerta {
    color: var(--warning);
    font-weight: bold;
    margin-top: 10px;
    padding: 10px;
    background-color: #fff8e1;
    border-left: 4px solid var(--warning);
}

.lista-contactos a{
    color: black;
}

.lista-contactos a:hover{
    color: blue;
}

@media (min-width: 400px) {
    body {
        padding: 30px;
        max-width: 400px;
        margin: 0 auto;
    }
}