body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 20px;
    display: flex;
    flex-direction: column;
    background-color: #f2f2f7;
    color: #333;
}

.solucion-container {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.solucion-container label {
    margin-right: 10px;
    font-weight: 500;
    font-size: 18px;
}

.solucion-container textarea {
    font-size: 18px;
    padding: 10px 14px;
    box-sizing: border-box;
    width: 50%;
    border: 1px solid #ccc;
    border-radius: 10px;
    background-color: #ffffff;
    transition: box-shadow 0.3s, border-color 0.3s;
}

.solucion-container textarea:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.15);
    border-color: #007aff;
}

.main-content {
    display: flex;
    width: 100%;
}

.inputs-container {
    flex: 2;
    margin-right: 20px;
}

.input-box {
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.input-box label {
    margin-right: 10px;
    font-weight: 500;
    font-size: 18px;
}

.input-box textarea {
    font-size: 18px;
    padding: 10px 14px;
    margin-right: 10px;
    width: 45%;
    border: 1px solid #ccc;
    border-radius: 10px;
    background-color: #ffffff;
    transition: box-shadow 0.3s, border-color 0.3s;
}

.input-box textarea:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.15);
    border-color: #007aff;
}

select {
    margin-right: 5px;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid #ccc;
    background-color: #ffffff;
    font-size: 16px;
    cursor: pointer;
    transition: border-color 0.3s, box-shadow 0.3s;
}

select:focus {
    outline: none;
    border-color: #007aff;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.keyboard-container {
    flex: 1;
    border: 1px solid #ddd;
    padding: 20px;
    border-radius: 16px;
    background-color: #ffffff;
    box-shadow: 0 6px 12px rgba(0,0,0,0.05);
}

.keyboard-container h3 {
    margin-top: 0;
    font-size: 22px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 20px;
}

.keyboard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 10px;
}

.keyboard-grid button {
    font-size: 22px;
    padding: 16px;
    cursor: pointer;
    background-color: #f2f2f7;
    border: 1px solid #ccc;
    border-radius: 12px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.keyboard-grid button:hover {
    background-color: #e0e0e5;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
}

.selected {
    border: 2px solid #007aff;
}

button.action-btn, button.action-btn-clc {
    font-size: 16px;
    margin: 6px 8px 6px 0;
    padding: 12px 22px;
    cursor: pointer;
    background-color: #007aff;
    color: white;
    border: none;
    border-radius: 10px;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

button.action-btn:hover, button.action-btn-clc:hover {
    background-color: #005ecb;
    box-shadow: 0 4px 10px rgba(0,0,0,0.12);
}

#letras-container button {
    font-size: 20px;
    margin: 5px;
    padding: 12px 18px;
    cursor: pointer;
    background-color: #f2f2f7;
    border: 1px solid #ccc;
    border-radius: 10px;
    transition: background-color 0.3s, box-shadow 0.3s;
    width: 22%;
}

#letras-container button:hover {
    background-color: #e0e0e5;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
}

.suposicion {
    padding-left: 10%;
}
.suposicion-bloque {
    position: relative;
    margin-left: 20px;
    padding-left: 10px;
}

.suposicion-bloque::before {
    content: '';
    position: absolute;
    top: 30px; /* desde el primer input-box (ajusta a gusto) */
    bottom: 10px; /* hasta el último input-box menos la CS */
    left: 0;
    border-left: 2px solid red;
    z-index: 0;
}


.input-box.suposicion-inicio::after,
.input-box.suposicion-fin::after {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 20px;
    border-top: 2px solid red;
    z-index: 0;
}