/* Game Button Styles */
.btn {
    background: linear-gradient(180deg, var(--vault-blue), rgba(var(--vault-blue-rgb), 0.9));
    color: var(--vault-yellow);
    border: 2px solid var(--vault-yellow);
    border-radius: 8px;
    padding: 0.6rem 1.2rem;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    -webkit-tap-highlight-color: transparent;
}

/* Ghost button variant */
.btn.ghost {
    background: transparent;
    border: 2px solid var(--vault-yellow);
    color: var(--vault-yellow);
}

/* Hover effects */
.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--accent-glow),
                0 6px 20px rgba(var(--vault-blue-rgb), 0.4);
}

.btn:hover::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    animation: shine 1.5s infinite;
}

/* Active state */
.btn:active {
    transform: translateY(1px);
    box-shadow: var(--accent-glow-intense);
}

/* Difficulty buttons specific styles */
.difficulty-btn {
    min-width: 100px;
    text-align: center;
    padding: 0.5rem 1rem;
}

.difficulty-btn.btn--active {
    background: var(--vault-yellow);
    color: var(--vault-blue);
    border-color: var(--vault-yellow);
    box-shadow: var(--accent-glow-intense);
}

.difficulty-btn:hover {
    background: linear-gradient(180deg, 
        rgba(var(--vault-blue-rgb), 0.95), 
        rgba(var(--vault-blue-rgb), 0.85)
    );
}

.difficulty-btn.btn--active:hover {
    background: var(--vault-yellow);
    transform: translateY(0);
}

/* Animations */
@keyframes shine {
    0% {
        left: -100%;
    }
    20% {
        left: 100%;
    }
    100% {
        left: 100%;
    }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .difficulty-btn {
        min-width: 90px;
        padding: 0.4rem 0.8rem;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.4rem 0.9rem;
        font-size: 0.85rem;
    }
    
    .difficulty-btn {
        min-width: 80px;
        padding: 0.35rem 0.7rem;
    }
}

/* Prevent text selection */
.btn {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Touch device optimizations */
@media (hover: none) {
    .btn:hover {
        transform: none;
        box-shadow: none;
    }
    
    .btn:hover::before {
        animation: none;
    }
    
    .btn:active {
        transform: scale(0.98);
        background: linear-gradient(180deg, 
            rgba(var(--vault-blue-rgb), 0.9), 
            rgba(var(--vault-blue-rgb), 0.8)
        );
    }
}