/* --- Variabili e Tema --- */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --danger-color: #dc3545;
    --success-color: #28a745;
    /* Colori base per i temi */
    --light-bg: #f8f9fa;
    --dark-bg: #212529;
    --light-text: #212529;
    --dark-text: #f8f9fa;
    --light-card-bg: #ffffff;
    --dark-card-bg: #343a40;
    --light-border-color: #dee2e6;
    --dark-border-color: #495057;
    --highlight-bg: rgba(255, 255, 0, 0.6);
    --tooltip-bg: #333;
    --tooltip-text: #fff;
    --shadow: 0 4px 8px rgba(0,0,0,0.1);
    --transition-speed: 0.3s;
}

/* 
 * FIX 1: Logica del tema corretta.
 * Definiamo le variabili del tema chiaro direttamente sul body.
 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--bg-color, var(--light-bg));
    color: var(--text-color, var(--light-text));
    transition: background-color var(--transition-speed), color var(--transition-speed);

    /* Valori di default (Tema Chiaro) */
    --bg-color: var(--light-bg);
    --text-color: var(--light-text);
    --card-bg: var(--light-card-bg);
    --border-color: var(--light-border-color);
}

/* Sovrascriviamo le variabili quando il tema scuro è attivo */
body.dark-theme {
    --bg-color: var(--dark-bg);
    --text-color: var(--dark-text);
    --card-bg: var(--dark-card-bg);
    --border-color: var(--dark-border-color);
}


/* --- Layout Generale --- */
.container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

@media (min-width: 992px) {
    .container {
        grid-template-columns: 1fr 1fr;
    }
}

header, footer {
    background-color: var(--card-bg);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

footer {
    text-align: center;
    justify-content: center;
    font-size: 0.9em;
    color: var(--secondary-color);
}

h1, h2 {
    color: var(--primary-color);
}

/* --- Pannelli --- */
.io-panel, .stats-panel {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: background-color var(--transition-speed);
}

/* --- Controlli (Pulsanti, Select) --- */
.controls-panel, .replacement-options, .export-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    align-items: center;
    margin: 1.5rem 0;
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: background-color var(--transition-speed), transform 0.1s;
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
}

.btn-primary { background-color: var(--primary-color); color: white; }
.btn-secondary { background-color: var(--secondary-color); color: white; }
.btn-danger { background-color: var(--danger-color); color: white; }
.btn-export { background-color: var(--success-color); color: white; }

select, textarea {
    width: 100%;
    padding: 0.5rem;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box; /* Previene problemi di padding */
}

/* --- Sezioni Input/Output --- */
.text-display {
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 1rem;
    min-height: 100px;
    white-space: pre-wrap; /* Manda a capo il testo mantenendo gli spazi */
    word-break: break-word; /* Manda a capo parole lunghe */
    background-color: var(--bg-color);
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

/* 
 * FIX 2: Layout dell'area di testo.
 * Applichiamo lo stesso comportamento di wrapping al tag <pre> 
 * che viene inserito dopo la pulizia del testo.
 */
.text-display pre {
    margin: 0; /* Rimuove il margine di default del pre */
    font-family: inherit; /* Usa lo stesso font del resto della pagina */
    white-space: pre-wrap;
    word-break: break-word;
}


.invisible-char {
    background-color: var(--highlight-bg);
    color: #000;
    font-weight: bold;
    border-radius: 3px;
    padding: 0 2px;
    cursor: help;
    position: relative;
    border-bottom: 1px dotted #333;
}

.invisible-char-tooltip {
    visibility: hidden;
    width: 160px;
    background-color: var(--tooltip-bg);
    color: var(--tooltip-text);
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -80px;
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.invisible-char:hover .invisible-char-tooltip {
    visibility: visible;
    opacity: 1;
}

/* --- Statistiche --- */
.stats-content table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}
.stats-content th, .stats-content td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.stats-content th {
    background-color: rgba(0,0,0,0.05);
}
body.dark-theme .stats-content th {
    background-color: rgba(255,255,255,0.05);
}
.chart-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 1.5rem;
}

/* --- Header e Controlli Destra --- */
.controls-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* --- Theme Switcher (FIX 1 con icone) --- */
label.theme-switcher {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
    cursor: pointer; /* Aggiungiamo un cursore per indicare che è cliccabile */
}
.theme-switcher input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 28px;
}
.slider:before {
    position: absolute;
    content: "☀️"; /* Icona sole */
    display: flex;
    align-items: center;
    justify-content: center;
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    font-size: 14px;
}
input:checked + .slider {
    background-color: var(--primary-color);
}
input:checked + .slider:before {
    content: "🌙"; /* Icona luna */
    transform: translateX(22px);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}