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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.screen {
    display: none;
    animation: fadeIn 0.5s ease-in;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    margin: 20px 0;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.card-header {
    text-align: center;
    margin-bottom: 30px;
}

.card-header h1 {
    font-size: 2.5em;
    color: #667eea;
    margin-bottom: 10px;
}

.card-header h2 {
    font-size: 2em;
    color: #764ba2;
    margin-bottom: 15px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

input, select, textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 10px 5px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.btn-success {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.btn-warning {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
    margin: 5px 2px;
}

.dashboard-grid {
    display: grid;
    /* Imposta una griglia a 3 colonne uguali */
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 20px 0;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
}

.stat-number {
    font-size: 2.5em;
    font-weight: bold;
    color: #667eea;
    margin: 10px 0;
}

.stat-label {
    color: #666;
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.chart-container {
    position: relative;
    height: 400px;
    margin: 20px 0;
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.navigation {
    background: rgba(255,255,255,0.9);
    padding: 15px;
    border-radius: 15px;
    margin: 20px 0;
    text-align: center;
    backdrop-filter: blur(10px);
}

.nav-btn {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
    padding: 10px 20px;
    border-radius: 20px;
    margin: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover, .nav-btn.active {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
}

.prediction-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 20px;
    margin: 20px 0;
    text-align: center;
}

.prediction-time {
    font-size: 2em;
    font-weight: bold;
    margin: 10px 0;
}

.dashboard-tab {
    display: none;
}

.dashboard-tab.active {
    display: block;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.data-table th,
.data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.data-table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #555;
}

.data-table tr:hover {
    background-color: #f5f5f5;
}

.alert {
    padding: 15px;
    border-radius: 10px;
    margin: 15px 0;
    font-weight: 500;
}

.alert-success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert-warning {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
}

.alert-danger {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert-info {
    background: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

.prediction-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.prediction-controls {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
    text-align: center;
}

.prediction-controls select {
    width: auto;
    margin: 0 10px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.prediction-result {
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.prediction-your-data {
    border-left: 5px solid #4facfe;
}

.prediction-standard-data {
    border-left: 5px solid #fa709a;
}

.loading {
    text-align: center;
    padding: 20px;
    color: #666;
}

.loading:after {
    content: '';
    width: 40px;
    height: 40px;
    margin: 10px auto;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .form-row, .form-row-3 {
        grid-template-columns: 1fr;
    }
    
    .dashboard-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .card {
        padding: 20px;
        margin: 10px 0;
    }
    
    .chart-container {
        height: 300px;
    }

    .prediction-section, .comparison-grid {
        grid-template-columns: 1fr;
    }
}

.error {
    color: #dc3545;
    font-size: 0.9em;
    margin-top: 5px;
}

.success {
    color: #28a745;
    font-size: 0.9em;
    margin-top: 5px;
}
/* --- OTTIMIZZAZIONE MOBILE --- */

/* Per schermi fino a 768px (Tablet e Smartphone in orizzontale) */
@media (max-width: 768px) {
    
    /* Riduce la griglia principale a 2 colonne */
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Manda a colonna singola i form e le sezioni di confronto */
    .form-row, 
    .comparison-grid {
        grid-template-columns: 1fr;
    }

    /* Permette ai bottoni di navigazione di andare a capo */
    .navigation {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-btn {
        flex-grow: 1; /* Fa sì che i bottoni occupino lo spazio disponibile */
    }

    /* Riduce un po' i margini e le dimensioni per guadagnare spazio */
    .card {
        padding: 20px;
        margin: 10px 0;
    }

    .card-header h1 {
        font-size: 2em;
    }

    .card-header h2 {
        font-size: 1.5em;
    }
    
    .chart-container {
        height: 300px; /* Abbassa l'altezza dei grafici */
    }
}

/* Per schermi fino a 480px (Smartphone in verticale) */
@media (max-width: 480px) {
    
    /* Riduce la griglia principale a 1 colonna per la massima leggibilità */
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .stat-number {
        font-size: 2em;
    }

    .btn {
        /* Rende i bottoni a larghezza piena per essere più facili da premere */
        width: 100%;
        margin-left: 0;
        margin-right: 0;
    }
}