:root {
    /* --- TEMA CHIARO (Light Mode) --- */
    --bg-body: #f0f4f8;           /* Sfondo pagina */
    --bg-container: #ffffff;      /* Sfondo box centrale */
    --text-main: #333333;         /* Testo principale */
    
    /* Colori Principali */
    --primary-bg: #1055ad;        /* Sfondo dei titoli principali */
    --primary-text: #1055ad;      /* Colore dei link e titoli */
    --primary-hover: #0c438a;     /* Colore al passaggio del mouse */
    
    /* Elementi UI */
    --border-color: #dae1e7;      /* Bordi sottili */
    --details-bg: #ffffff;        /* Sfondo dei dettagli chiusi */
    --content-bg: #f7f9fc;        /* Sfondo area interna (grigino) */
    --item-hover: #eef4fb;        /* Sfondo hover elementi */
    --shadow: 0 4px 15px rgba(16, 85, 173, 0.1);
    
    --icon-filter: invert(0);
}

[data-theme="dark"] {
    /* --- TEMA SCURO (Dark Mode) --- */
    --bg-body: #121212;
    --bg-container: #1e1e1e;
    --text-main: #e0e0e0;
    
    /* Colori Principali (Adattati per contrasto su scuro) */
    --primary-bg: #1565c0;        /* Un blu leggermente più acceso per i box */
    --primary-text: #64b5f6;      /* Celeste chiaro per i link (più leggibile) */
    --primary-hover: #42a5f5;
    
    /* Elementi UI */
    --border-color: #333333;
    --details-bg: #252525;
    --content-bg: #2d2d2d;
    --item-hover: #383838;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    
    --icon-filter: invert(1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-container);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    position: relative;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.top-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.lang-btn {
    background-color: var(--primary-bg);
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    font-size: 0.9em;
    font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    transition: background-color 0.2s;
}

.lang-btn:hover {
    background-color: var(--primary-hover);
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.icon-btn:hover {
    background-color: var(--item-hover);
}

.icon-btn img {
    width: 20px;
    height: 20px;
    filter: var(--icon-filter);
    transition: filter 0.3s;
}

/* Titolo Principale */
h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-text);
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 2px solid var(--item-hover);
    padding-bottom: 10px;
    margin-top: 10px;
}

details {
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--details-bg);
    overflow: hidden;
    transition: background-color 0.3s, border-color 0.3s;
}

summary {
    cursor: pointer;
    padding: 15px;
    font-weight: bold;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s, color 0.2s;
}

summary::after {
    content: '+';
    font-size: 1.2em;
    font-weight: bold;
}

details[open] > summary::after {
    content: '-';
}

summary::-webkit-details-marker {
    display: none;
}

.main-level > summary {
    background-color: var(--primary-bg);
    color: white;
    font-size: 1.1em;
    border: 1px solid var(--primary-bg);
}

.main-level > summary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

.main-content {
    padding: 20px;
    background-color: var(--content-bg);
}

.faculty-level {
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
    box-shadow: none;
}

.faculty-level > summary {
    background-color: var(--bg-container);
    color: var(--text-main);
    font-size: 1em;
    border-left: 5px solid var(--primary-bg);
}

.faculty-level > summary:hover {
    background-color: var(--item-hover);
    color: var(--primary-text);
}

ul {
    list-style-type: none;
    padding: 15px 20px;
    background: var(--bg-container);
    border-top: 1px solid var(--border-color);
    transition: background-color 0.3s;
}

li {
    margin-bottom: 8px;
    padding-left: 5px;
}

li:last-child {
    margin-bottom: 0;
}

a {
    text-decoration: none;
    color: var(--primary-text);
    font-weight: 500;
    transition: color 0.2s, padding-left 0.2s;
    display: block;
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
    padding-left: 5px;
}

@media (max-width: 600px) {
    .top-controls {
        position: static;
        display: flex;
        justify-content: center;
        margin-bottom: 20px;
    }
}

.search-wrapper {
    margin-bottom: 20px;
    text-align: center;
}

#search-input {
    width: 100%;
    max-width: 400px;
    padding: 12px 20px;
    font-size: 1em;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    background-color: var(--bg-body);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#search-input:focus {
    border-color: var(--primary-bg);
    box-shadow: 0 0 8px rgba(16, 85, 173, 0.3);
}

.hidden {
    display: none !important;
}