:root {
            /* Sfondi e Layout Tema Chiaro Tecnologico */
            --bg-page: #f8fafc;         /* Sfondo pagina grigio-azzurro chiaro e pulito */
            --text-main: #0f172a;       /* Blu navy scurissimo / quasi nero per massima leggibilità */
            --text-muted: #64748b;      /* Grigio ardesia per i sottotitoli */
            
            /* Colori Identitari & Sicurezza */
            --navy-primary: #1e3a8a;    /* Blu navy profondo (istituzionale, sicuro, affidabile) */
            --purple-primary: #7c3aed;  /* Viola originale per il logo */
            --purple-light: #f5f3ff;    /* Sfondo chiaro per il badge */
            
            /* Accento Oro/Ambra (Precisione, Certificazione, Alert controllato) */
            --gold-primary: #d97706;    /* Oro scuro / Ambra elegante per pulsanti e dettagli */
            --gold-hover: #b45309;      /* Oro scuro hover */
            
            /* Struttura, Bordi e Vetro */
            --card-bg: rgba(255, 255, 255, 0.85); /* Sfondo card bianco semi-trasparente */
            --border-color: #e2e8f0;    /* Bordo pulito e neutro */
            --accent-glow: rgba(217, 119, 6, 0.15); /* Luce dorata soffusa per il focus */
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-page);
            color: var(--text-main);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
            perspective: 1000px;
            overflow-x: hidden;
            /* Leggero gradiente di sfondo sui toni dell'azzurro polvere e bianco */
            background-image: radial-gradient(circle at 50% 0%, #e0f2fe 0%, var(--bg-page) 70%);
        }

        .navbar {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 40px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .logo {
            font-weight: 700;
            font-size: 20px;
            color: var(--navy-primary); /* Blu navy per la prima parte del logo */
            text-decoration: none;
            letter-spacing: -0.01em;
        }

        .logo span {
            color: var(--purple-primary); /* Viola originale per la seconda parte ("Coding") */
        }

        /* Contenitore con effetto 3D e Clean Glassmorphism */
        .container {
            background: var(--card-bg);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.28), 0 5px 15px rgba(0, 0, 0, 0.13);
            width: 100%;
            max-width: 440px;
            
            transform: rotateX(8deg) translateY(0);
            transform-style: preserve-3d;
            transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
        }

        .container:hover {
            transform: rotateX(0deg) translateY(-8px);
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.65), 0 10px 20px -5px rgba(217, 119, 6, 0.3);
            border-color: rgba(217, 119, 6, 0.3);
        }

        .badge {
            display: inline-block;
            background-color: var(--purple-light);
            color: var(--purple-primary);
            font-size: 11px;
            font-weight: 600;
            padding: 6px 12px;
            border-radius: 20px;
            margin-bottom: 16px;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            border: 1px solid rgba(124, 58, 237, 0.15);
        }

        h2 {
            font-size: 26px;
            font-weight: 700;
            margin-top: 0;
            margin-bottom: 8px;
            color: var(--navy-primary);
            letter-spacing: -0.02em;
        }

        .subtitle {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 24px;
        }

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

        label {
            font-size: 13px;
            font-weight: 600;
            display: block;
            margin-bottom: 8px;
            color: var(--navy-primary);
        }

        input[type="text"], input[type="email"] {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            background: #ffffff;
            color: var(--text-main);
            font-size: 14px;
            transition: all 0.2s ease;
        }

        input:focus {
            outline: none;
            border-color: var(--gold-primary);
            box-shadow: 0 0 0 3px var(--accent-glow);
        }

        button[type="submit"] {
            width: 100%;
            padding: 12px 16px;
            background-color: var(--gold-primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
            margin-top: 8px;
            box-shadow: 0 4px 12px rgba(217, 119, 6, 0.2);
        }

        button[type="submit"]:hover {
            background-color: var(--gold-hover);
            box-shadow: 0 6px 16px rgba(217, 119, 6, 0.35);
        }

        .alert {
            padding: 12px 16px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-size: 13px;
            line-height: 1.4;
        }

        .alert.success {
            color: #065f46;
            background-color: #ecfdf5;
            border: 1px solid #10b981; /* Verde di conferma operativo */
        }

        .alert.error {
            color: #991b1b;
            background-color: #fef2f2;
            border: 1px solid #f87171;
        }