:root {
    --primary-color: #007bff;
    --primary-color-dark: #0056b3;
    --background-light: #f4f7f9;
    --background-white: #ffffff;
    --text-color: #333;
    --border-color: #ccc;
    --grid-color: #e9e9e9;
    --shadow-color: rgba(0, 0, 0, 0.1);
}
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: var(--background-light); color: var(--text-color); display: flex; justify-content: center; padding: 20px; margin: 0; }
main { background-color: var(--background-white); padding: 20px 40px; border-radius: 8px; box-shadow: 0 4px 12px var(--shadow-color); width: 100%; max-width: 900px; }
h1, h2 { text-align: center; color: var(--primary-color); }
.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; font-weight: bold; }
input[type="url"], input[type="text"], input[type="password"], select { width: 100%; padding: 10px; border: 1px solid var(--border-color); border-radius: 4px; box-sizing: border-box; font-size: 16px; }
button { width: 100%; padding: 12px; background-color: var(--primary-color); color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; font-weight: bold; transition: background-color 0.2s ease-in-out; }
button:hover { background-color: var(--primary-color-dark); }
#status, #graphs-status { text-align: center; margin-top: 20px; font-weight: bold; display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 30px; }

/* --- INICIO DE LA MODIFICACIÓN --- */
#graphs-container {
    margin-top: 30px;
    display: flex; /* Habilita Flexbox */
    flex-direction: column; /* Apila los elementos verticalmente */
    gap: 20px; /* Añade un espacio de 20px entre los gráficos */
}
/* --- FIN DE LA MODIFICACIÓN --- */

.chart-wrapper { 
    position: relative; 
    /* Se elimina el margen superior para que 'gap' lo controle */
    padding: 20px; 
    border: 1px solid var(--grid-color); 
    border-radius: 4px; 
    height: 400px;
}
.chart-wrapper h3 { text-align: center; margin-top: 0; color: #555; font-size: 1em; font-weight: normal; }
.hidden { display: none; }
.spinner { border: 4px solid rgba(0, 0, 0, 0.1); width: 24px; height: 24px; border-radius: 50%; border-left-color: var(--primary-color); animation: spin 1s ease infinite; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* ****** ESTILOS PARA REDUCIR EL GRÁFICO DE DISPONIBILIDAD ****** */
.chart-wrapper-small {
    height: 150px;
    padding-bottom: 10px;
}

/* ESTILOS PARA SPARKLINE */
#sparkline-container-wrapper { margin-top: 30px; border: 1px solid var(--grid-color); border-radius: 4px; padding: 15px; }
#sparkline-container-wrapper h4 { margin: 0 0 15px 0; text-align: center; font-weight: bold; color: #555; }
#sparkline-container { display: flex; justify-content: space-between; align-items: flex-end; gap: 10px; }
.sparkline-item { flex: 1; text-align: center; }
.sparkline-item canvas { height: 40px !important; width: 100% !important; }
.sparkline-item label { font-size: 0.8em; color: #666; margin-bottom: 5px; font-weight: normal; }

/* NUEVOS ESTILOS PARA EL CONTENEDOR DE TRÁFICO ACUMULADO */
#accumulated-traffic-container {
    text-align: center;
    margin: 10px auto;
    padding: 10px;
    background-color: var(--background-light);
    border-radius: 5px;
    font-size: 1.1em;
    color: var(--text-color);
    font-weight: 500;
}

canvas {
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    background-color: #fff;
    display: block; 
    width: 100% !important;
}

/* Efecto hover en las sparklines */
.sparkline-item {
    transition: transform 0.2s ease-in-out;
}
.sparkline-item:hover {
    transform: scale(1.05);
}
.sparkline-item canvas:hover {
    border: 2px solid var(--primary-color);
}

/* Botón de reset de zoom */
#reset-zoom-btn {
    display: block;
    margin: 10px auto 0;
    padding: 8px 16px;
    border: none;
    border-radius: 5px;
    background-color: var(--primary-color);
    color: #fff;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
    width: auto;
}
#reset-zoom-btn:hover {
    background-color: var(--primary-color-dark);
}
#reset-zoom-btn.hidden {
    display: none;
}