/* Intro Overlay Layer */
.intro-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: transparent;
    /* Use transparent to show simulation-bg, main content is hidden */
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    transition: transform 1s cubic-bezier(0.77, 0, 0.175, 1), opacity 0.8s ease, backdrop-filter 0.8s ease;
}

.intro-overlay.hidden {
    opacity: 0;
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    pointer-events: none;
    transform: scale(1.05);
    /* Smooth scale out */
}

.controller-wrapper {
    position: relative;
    transform: translateY(-150vh) rotate(15deg);
    animation: dropIn 1.5s cubic-bezier(0.2, 0.8, 0.2, 1.2) forwards;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3rem;
    cursor: pointer;
}

@keyframes dropIn {
    0% {
        transform: translateY(-150vh) rotate(15deg);
    }

    60% {
        transform: translateY(20px) rotate(-5deg);
    }

    80% {
        transform: translateY(-10px) rotate(2deg);
    }

    100% {
        transform: translateY(0) rotate(0deg);
    }
}

.controller {
    position: relative;
    filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.5));
    transition: transform 0.3s ease;
}

.controller-wrapper:hover .controller {
    transform: scale(1.1);
}

.controller-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150%;
    height: 150%;
    background: radial-gradient(circle, var(--primary) 0%, transparent 60%);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.controller-wrapper.ready .controller-glow {
    opacity: 1;
    animation: pulse 3s infinite alternate;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.5;
    }

    100% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 1;
    }
}

.click-to-start {
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 1.2rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease;
}

.controller-wrapper.ready .click-to-start {
    opacity: 1;
    transform: translateY(0);
    animation: text-pulse 2s infinite alternate;
}

@keyframes text-pulse {
    0% {
        opacity: 0.5;
        text-shadow: 0 0 0px transparent;
    }

    100% {
        opacity: 1;
        text-shadow: 0 0 10px var(--highlight);
    }
}

/* Neon Ripple Effect */
.ripple-container {
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    pointer-events: none;
    z-index: -2;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.controller-wrapper.ready~.ripple-container,
.intro-overlay:has(.controller-wrapper.ready) .ripple-container {
    opacity: 1;
}

.ripple {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    border-radius: 50%;
    border: 2px solid var(--highlight);
    box-shadow: 0 0 20px var(--highlight), inset 0 0 20px var(--highlight);
    opacity: 0;
}

.controller-wrapper.ready~.ripple-container .ripple,
.intro-overlay:has(.controller-wrapper.ready) .ripple-container .ripple {
    animation: ripple-anim 4s linear infinite;
}

.ripple:nth-child(2) {
    animation-delay: 1.3s !important;
}

.ripple:nth-child(3) {
    animation-delay: 2.6s !important;
}

@keyframes ripple-anim {
    0% {
        width: 100px;
        height: 100px;
        opacity: 0.8;
    }

    100% {
        width: 800px;
        height: 800px;
        opacity: 0;
    }
}