/* --- VARIABILI GLOBALI --- */
:root {
    --green-bright: #2ecc71;
    --green-glow: rgba(46, 204, 113, 0.4);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(46, 204, 113, 0.2);
    --top: 10px;
    --text-base: 1.1rem;
}

/* --- RESET E BASE --- */
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #000; /* Sfondo di sicurezza */
}

/* --- SCHERMATA FASE 2 --- */
#start-fase2 {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 500;
    color: white;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    
    /* Sfondo Sfumato Base */
    background: radial-gradient(circle at center, #0a2f1a 0%, #000000 100%);
    transition: opacity 0.5s ease;
}

/* Overlay per dare texture allo sfondo */
.overlay-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(46, 204, 113, 0.05) 100%);
    pointer-events: none;
    z-index: 0;
}

/* --- CONTENUTO --- */
.content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
}

/* Sezione Titolo (50% sopra) */
.top-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.top-section h1 {
    font-size: 3.5rem;
    text-transform: uppercase;
    letter-spacing: 5px;
    color: var(--green-bright);
    text-shadow: 0 0 20px var(--green-glow);
    margin: 0;
    padding: 20px;
}

/* Sezione Box (50% sotto) */
.bottom-section {
    flex: 1;
    display: flex;
    flex-direction: row;
    width: 100%;
    align-items: flex-start;
    padding-top: 20px;
}

.item {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 0 20px;
}

/* --- BOX STILIZZATI (Glassmorphism) --- */
.controls-box, .instructions-box {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-top: 4px solid var(--green-bright);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.6);
    width: 100%;
    max-width: 350px;
    min-height: 200px;
    text-align: center;
}

.controls-box h3, .instructions-box h3 {
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 1.4rem;
    text-transform: uppercase;
    color: var(--green-bright);
    letter-spacing: 1px;
}

.controls-box p, .instructions-box p {
    font-size: var(--text-base);
    line-height: 1.6;
    margin: 10px 0;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

/* --- ELEMENTI SPECIALI --- */
kbd {
    background: #222;
    color: var(--green-bright);
    border: 1px solid var(--green-bright);
    padding: 3px 10px;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    font-weight: bold;
    box-shadow: 0 0 5px var(--green-glow);
}

b, i {
    color: var(--green-bright);
    font-style: normal;
}

/* --- PULSANTE CENTRALE --- */
.item.center {
    align-items: center; /* Il pulsante centrale lo vogliamo a metà altezza */
    height: 50%; 
}

.pulse-text {
    display: inline-block;
    padding: 20px 40px;
    font-size: 1.5rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: white;
    border: 2px solid var(--green-bright);
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    animation: pulse 2s infinite;
    background: rgba(46, 204, 113, 0.1);
}

.pulse-text:hover {
    background: var(--green-bright);
    color: black;
    box-shadow: 0 0 30px var(--green-glow);
    transform: scale(1.1);
    animation-play-state: paused; /* Si ferma quando ci passi sopra */
}

/* --- ANIMAZIONI --- */
@keyframes pulse {
    0% { transform: scale(1); opacity: 1; box-shadow: 0 0 0 0 rgba(46, 204, 113, 0.7); }
    50% { transform: scale(1.05); opacity: 0.7; box-shadow: 0 0 20px 10px rgba(46, 204, 113, 0); }
    100% { transform: scale(1); opacity: 1; box-shadow: 0 0 0 0 rgba(46, 204, 113, 0); }
}

/* --- RESPONSIVE VELOCE --- */
@media (max-width: 900px) {
    .bottom-section {
        flex-direction: column;
        align-items: center;
    }
    .item {
        margin-bottom: 20px;
        width: 80%;
    }
    .top-section h1 {
        font-size: 2rem;
    }
}