@font-face {
  font-family: 'B612';
  src: url('B612/B612-Regular.ttf') format('truetype');
  font-weight: normal; /* O 400 */
  font-style: normal;
  font-display: swap;
}

/* Variante BOLD (Negrita) */
@font-face {
  font-family: 'B612';
  src: url('B612/B612-Bold.ttf') format('truetype');
  font-weight: bold; /* O 700 */
  font-style: normal;
  font-display: swap;
}

body {
    background-color: black;
    color: white;
    font-family: 'B612', sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1 {
    text-align: center;
    font-size: 2.5em;
}

.imagen_centrada {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.link_imagen_titulo {
    display: flex;
    justify-content: center;
}

.imagen_titulo {
    width: 50%;
}

.boton_seccion:link, .boton_seccion:visited {
    background-color: #003d91;
    color: white;
    font-weight: 800;
    font-size: 24px;
    padding: 14px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    border-color: white;
    border: 0.6px solid;
    border-radius: 5px;
}

.boton_seccion:hover, .boton_seccion:active {
    background-color: #0261e6;
}

.boton_seccion_special:link, .boton_seccion_special:visited {
    background-color: #ff0000;
    color: white;
    font-weight: 800;
    font-size: 24px;
    padding: 14px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    border-color: white;
    border: 0.6px solid;
    border-radius: 5px;
}

.boton_seccion_special:hover, .boton_seccion_special:active {
    background-color: #ff6600;
}

footer {
    margin-top: auto;
}

.checklist {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    padding: 20px;
}

.row {
    display: flex;
    align-items: center;
    margin: 10px 0;
    font-size: 24px;
}

.item {
    white-space: nowrap;
}

.dots {
    flex: 1;
    border-bottom: 2px dashed white;
    margin: 0 10px;
}

.action {
    white-space: nowrap;
    margin-right: 10px;
}

input[type="checkbox"] {
    cursor: pointer;
    width: 22px;
    height: 22px;
    accent-color: #0261e6;
}

#nextSectionButton {
    display: none;
}

.checklist_notes {
    max-width: 700px;
    margin: 5px 0 15px 0;
    font-size: 18px;
    color: #cecece;
}

/* quitar flecha nativa */
.checklist_notes summary {
    cursor: pointer;
    list-style: none;
    font-style: italic;
}

/* flecha personalizada */
.checklist_notes summary::before {
    content: "▶ ";
    color: rgb(0, 132, 255);
    font-weight: bold;
}

/* cuando está abierto */
.checklist_notes[open] summary::before {
    content: "▼ ";
}

.checklist_notes p,
.checklist_notes ul {
    margin-left: 20px;
}

.alert_box {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: #ffd500;
    color: black;
    padding: 10px 14px;
    margin: 10px 0;
    border-radius: 5px;
    font-size: 22px;
}

.alert_icon {
    font-size: 60px;
    font-weight: 500;
}

hr {
    border: 2px solid rgb(0, 132, 255);
}

.hr_caution {
    border: 2px solid rgb(255, 38, 0);
}

.info_box {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: rgb(0, 132, 255);
    color: white;
    padding: 10px 14px;
    margin: 10px 0;
    border-radius: 5px;
    font-size: 22px;
}

.info_icon {
    font-size: 40px;
    font-weight: bolder;
}

/* quitar flecha nativa */
.about_section summary {
    cursor: pointer;
    list-style: none;
    text-align: left;
    font-size: 1.5em;
    font-weight: bold;
    margin-left: 25px;
}

/* ocultar flecha en algunos navegadores */
.about_section summary::-webkit-details-marker {
    display: none;
}

/* flecha personalizada */
.about_section summary::before {
    content: "▶ ";
    color: rgb(0, 132, 255);
    font-weight: bold;
}

/* cuando está abierto */
.about_section[open] summary::before {
    content: "▼ ";
}

.sticky_note {
    position: sticky;
    top: 15px;
    z-index: 100;
}

.calc_container {
    display: flex; 
    flex-wrap: wrap; 
    gap: 12px; 
    align-items: flex-end; 
    background-color: #1a1a1a; 
    padding: 15px; 
    border: 1px solid #003d91; 
    border-radius: 5px; 
    margin-top: 15px;
}

.calc_group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.calc_label {
    font-size: 12px;
    font-weight: bold;
    color: #0261e6;
    text-transform: uppercase;
}

.calc_input, .calc_select {
    background-color: #000;
    color: #fff;
    border: 1px solid #555;
    padding: 6px;
    font-family: 'B612', sans-serif;
    font-size: 14px;
    border-radius: 3px;
}

.calc_input:focus, .calc_select:focus {
    outline: none;
    border-color: #0261e6;
}

.calc_button {
    background-color: #003d91;
    color: white;
    border: 1px solid white;
    padding: 8px 15px;
    font-family: 'B612', sans-serif;
    font-weight: bold;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.2s;
}

.calc_button:hover {
    background-color: #0261e6;
}

.calc_result {
    width: 100%;
    margin-top: 10px;
    font-weight: bold;
    color: #00ff00;
    font-size: 1.1em;
}

.one_line_detail {
    font-style: italic;
    font-size: 18px;
    color: #cecece;
}