/* シークレットゲーム起動演出 */
.secret-game-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(232, 48, 21, 0.2) 0%, rgba(0, 0, 0, 0.95) 100%);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.5s ease-out;
    overflow: hidden;
}

.secret-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border: 3px solid #E83015;
    border-radius: 50%;
    opacity: 0;
    animation: ringExpand 2s ease-out forwards;
}

@keyframes ringExpand {
    0% {
        width: 200px;
        height: 200px;
        opacity: 0;
        border-width: 20px;
    }
    50% {
        opacity: 1;
        border-width: 3px;
    }
    100% {
        width: 150vmax;
        height: 150vmax;
        opacity: 0;
        border-width: 1px;
    }
}

.secret-particle {
    position: fixed;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 10002;
    animation: secretParticleFly 2s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    box-shadow: 0 0 10px currentColor, 0 0 20px currentColor;
}

@keyframes secretParticleFly {
    0% {
        transform: translate(-50%, -50%) scale(0);
        opacity: 1;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translate(calc(-50% + var(--tx)), calc(-50% + var(--ty))) scale(1.5);
        opacity: 0;
    }
}

/* 電撃エフェクト */
.lightning {
    position: absolute;
    width: 2px;
    height: 100vh;
    background: linear-gradient(to bottom, transparent, #FFFFFF, transparent);
    opacity: 0;
    animation: lightning 0.2s ease-out;
}

@keyframes lightning {
    0% {
        opacity: 0;
        transform: scaleY(0);
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
    }
    100% {
        opacity: 0;
        transform: scaleY(1);
    }
}