kbody {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    margin: 0;
    padding: 20px 10px;
    box-sizing: border-box;
    background-color: #f4f4f9;
}

h1 { color: #333; margin-top: 0; margin-bottom: 0; text-align: center; }

#sudoku-board {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    grid-template-rows: repeat(9, 1fr);
    border: 3px solid black;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1 / 1;
    margin-bottom: 25px;
    position: relative;
    margin-left: auto;
    margin-right: auto;
}

.cell {
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    border-right: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
    cursor: pointer;
    position: relative;
}
.cell:nth-child(9n) { border-right: none; }
.cell:nth-child(n+73) { border-bottom: none; }

.cell.pre-filled {
    background-color: #e9ecef;
    font-weight: bold;
    color: #343a40;
    cursor: default;
    font-size: clamp(20px, 5vw, 32px);
}

.cell.active-cell { background-color: #dbeaff; }
.cell.wrong { background-color: #ffdddd !important; }

.cell-value {
    font-size: clamp(20px, 5vw, 32px);
    font-weight: bold;
    color: #0056b3;
    animation: pop-in 0.2s ease-out;
}

.candidate-grid {
    display: none;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    width: 100%;
    height: 100%;
    align-items: center;
    justify-items: center;
}

.candidate-number {
    font-size: clamp(8px, 1.5vw, 11px);
    color: #6c757d;
}

.notes-mode .cell-value:empty {
    display: none;
}
.notes-mode .cell-value:empty + .candidate-grid {
    display: grid;
}

.game-controls { display: flex; flex-direction: column; align-items: center; gap: 15px; width: 100%; max-width: 500px; margin: 0 auto; }
.settings-bar { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 15px; width: 100%; }
.action-buttons { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.difficulty-control, .timer-display { display: flex; align-items: center; gap: 10px; }
.settings-bar label { font-size: 16px; color: #555; }
.select-wrapper { position: relative; }
#difficulty { -webkit-appearance: none; appearance: none; padding: 10px 35px 10px 15px; font-size: 16px; cursor: pointer; border: 1px solid #ccc; border-radius: 5px; background-color: #fff; font-family: inherit; }
.select-wrapper::after { content: '▼'; font-size: 12px; color: #555; position: absolute; right: 12px; top: 50%; transform: translateY(-50%); pointer-events: none; }
.action-buttons button { padding: 10px 15px; font-size: 14px; cursor: pointer; border: 1px solid #ccc; border-radius: 5px; background-color: #fff; }
#toggle-notes-btn.active { background-color: #007bff; color: white; border-color: #007bff; }

.timer-display { gap: 20px; background-color: #e9ecef; padding: 8px 15px; border-radius: 5px; }
.timer-item { display: flex; flex-direction: column; align-items: center; }
.timer-item span:first-child { font-size: 12px; color: #6c757d; }
.timer-item span:last-child { font-size: 18px; font-weight: bold; color: #343a40; min-width: 50px; text-align: center; }

#input-palette {
    position: fixed;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    padding: 8px;
    background-color: #ffffff;
    border: 1px solid #999;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.25);
    z-index: 1000;
    width: 150px;
    opacity: 0;
    transform: scale(0.9);
    transition: transform 0.1s ease-out, opacity 0.1s ease-out;
    pointer-events: none;
}
#input-palette.visible { opacity: 1; transform: scale(1); pointer-events: all; }
.palette-number, .palette-clear { height: 40px; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: bold; cursor: pointer; border-radius: 5px; transition: background-color 0.2s; }
.palette-number { color: #0056b3; }
.palette-number:hover { background-color: #eaf2ff; }
.palette-clear { grid-column: 1 / span 3; background-color: #fce8e6; color: #c5221f; }
.palette-clear:hover { background-color: #f7d5d2; }
@keyframes pop-in { from { transform: scale(0.5); opacity: 0; } to { transform: scale(1); opacity: 1; } }

@media (max-width: 600px) { .settings-bar { flex-direction: column; gap: 15px; } }

.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); display: flex; align-items: center; justify-content: center; z-index: 2000; opacity: 0; transition: opacity 0.2s; pointer-events: none; }
.modal-overlay:not(.hidden) { opacity: 1; pointer-events: all; }
.modal-content { background-color: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 5px 20px rgba(0,0,0,0.3); text-align: center; max-width: 90%; width: 400px; }
#save-section { display: flex; gap: 10px; margin-bottom: 15px; }
#save-name-input { flex-grow: 1; padding: 10px; border: 1px solid #ccc; border-radius: 5px; }
#saved-games-list { list-style: none; padding: 0; margin: 0 0 15px 0; max-height: 200px; overflow-y: auto; text-align: left; }
.saved-game-item { display: flex; justify-content: space-between; align-items: center; padding: 10px; border-bottom: 1px solid #eee; }
.saved-game-item:hover { background-color: #f8f8f8; }
.saved-game-info { cursor: pointer; }
.saved-game-name { font-weight: bold; }
.saved-game-date { font-size: 12px; color: #888; }
.delete-save-btn { background: none; border: none; color: #c5221f; cursor: pointer; font-size: 18px; }
#modal-cancel-btn { margin-top: 10px; }

/* ... alla fine del file ... */

.instructions-content {
    text-align: left;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-tabs {
    display: flex;
    border-bottom: 1px solid #ccc;
    margin-bottom: 15px;
}

.tab-btn {
    padding: 10px 15px;
    cursor: pointer;
    border: none;
    background-color: transparent;
    border-bottom: 3px solid transparent;
    font-size: 16px;
    margin-bottom: -1px; /* Allinea il bordo inferiore con quello del container */
}

.tab-btn.active {
    border-bottom-color: #007bff;
    font-weight: bold;
    color: #007bff;
}

.tab-content {
    display: none;
    overflow-y: auto;
    padding-right: 10px; /* Spazio per la scrollbar */
}

.tab-content.active {
    display: block;
    animation: fade-in 0.3s;
}

.tab-content h3 {
    margin-top: 0;
}
.tab-content p, .tab-content ul {
    line-height: 1.6;
    color: #333;
}
.tab-content ul {
    padding-left: 20px;
}
.tab-content li {
    margin-bottom: 10px;
}
.tab-content strong {
    color: #0056b3;
}

#instructions-close-btn {
    margin-top: 20px;
    padding: 10px 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #e9ecef;
    cursor: pointer;
    align-self: center;
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

#language-switcher {
    /* 1. Definiamo una larghezza massima identica a quella della griglia e dei controlli */
    max-width: 500px;
    width: 100%;

    /* 2. Centriamo il contenitore, come la griglia */
    margin-left: auto;
    margin-right: auto;
    margin-top: -10px; /* Rimuove qualsiasi spazio SOPRA il selettore */
    margin-bottom: 10px; /* Aggiunge un po' di spazio prima della griglia */

    /* 3. Allineiamo i pulsanti al suo interno verso destra */
    display: flex;
    justify-content: flex-end; /* Allinea gli elementi figli alla fine (destra) */
    gap: 5px;
}

.lang-btn {
    border: 1px solid transparent;
    background-color: transparent;
    padding: 5px 10px;
    cursor: pointer;
    border-radius: 5px;
    font-weight: bold;
    color: #6c757d;
}

.lang-btn.active {
    background-color: #fff;
    color: #0056b3;
    border-color: #ccc;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Stile per il link-pulsante alla guida avanzata nel modale */
.button-link {
    display: inline-block;
    padding: 10px 20px;
    background-color: #007bff;
    color: white !important; /* Aggiunto !important per sovrascrivere stili generici del link */
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.2s;
    border: none;
}
.button-link:hover {
    background-color: #0056b3;
}